zlib 1.0.7

ChangeLog

@@ -1,6 +1,224 @@
 
 		ChangeLog file for zlib
 
+Changes in 1.0.7 (20 Jan 1998)
+- fix gzseek which was broken in write mode
+- return error for gzseek to negative absolute position
+- fix configure for Linux (Chun-Chung Chen)
+- increase stack space for MSC (Tim Wegner)
+- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
+- define EXPORTVA for gzprintf (Gilles Vollant)
+- added man page zlib.3 (Rick Rodgers)
+- for contrib/untgz, fix makedir() and improve Makefile
+
+- check gzseek in write mode in example.c
+- allocate extra buffer for seeks only if gzseek is actually called
+- avoid signed/unsigned comparisons (Tim Wegner, Gilles Vollant)
+- add inflateSyncPoint in zconf.h
+- fix list of exported functions in nt/zlib.dnt and mdsos/zlib.def
+
+Changes in 1.0.6 (19 Jan 1998)
+- add functions gzprintf, gzputc, gzgetc, gztell, gzeof, gzseek, gzrewind and
+  gzsetparams (thanks to Roland Giersig and Kevin Ruland for some of this code)
+- Fix a deflate bug occuring only with compression level 0 (thanks to
+  Andy Buckler for finding this one).
+- In minigzip, pass transparently also the first byte for .Z files.
+- return Z_BUF_ERROR instead of Z_OK if output buffer full in uncompress()
+- check Z_FINISH in inflate (thanks to Marc Schluper)
+- Implement deflateCopy (thanks to Adam Costello)
+- make static libraries by default in configure, add --shared option.
+- move MSDOS or Windows specific files to directory msdos
+- suppress the notion of partial flush to simplify the interface
+  (but the symbol Z_PARTIAL_FLUSH is kept for compatibility with 1.0.4)
+- suppress history buffer provided by application to simplify the interface
+  (this feature was not implemented anyway in 1.0.4)
+- next_in and avail_in must be initialized before calling inflateInit or
+  inflateInit2
+- add EXPORT in all exported functions (for Windows DLL)
+- added Makefile.nt (thanks to Stephen Williams)
+- added the unsupported "contrib" directory:
+   contrib/asm386/ by Gilles Vollant <info@winimage.com>
+	386 asm code replacing longest_match().
+   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+   contrib/iostream2/  by Tyge L<>vset <Tyge.Lovset@cmr.no>
+	Another C++ I/O streams interface
+   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+	A very simple tar.gz file extractor using zlib
+   contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.
+- pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
+  level) in minigzip (thanks to Tom Lane)
+
+- use const for rommable constants in deflate
+- added test for gzseek and gztell in example.c
+- add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
+- add undocumented function zError to convert error code to string
+  (for Tim Smithers)
+- Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
+- Use default memcpy for Symantec MSDOS compiler.
+- Add EXPORT keyword for check_func (needed for Windows DLL)
+- add current directory to LD_LIBRARY_PATH for "make test"
+- create also a link for libz.so.1
+- added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
+- use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
+- added -soname for Linux in configure (Chun-Chung Chen,
+- assign numbers to the exported functions in zlib.def (for Windows DLL)
+- add advice in zlib.h for best usage of deflateSetDictionary
+- work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
+- allow compilation with ANSI keywords only enabled for TurboC in large model
+- avoid "versionString"[0] (Borland bug)
+- add NEED_DUMMY_RETURN for Borland
+- use variable z_verbose for tracing in debug mode (Peter Deutsch).
+- allow compilation with CC
+- defined STDC for OS/2 (David Charlap)	
+- limit external names to 8 chars for MVS (Thomas Lund)
+- in minigzip.c, use static buffers only for 16-bit systems
+- fix suffix check for "minigzip -d foo.gz"
+- do not return an error for the 2nd of two consecutive gzflush() (Felix Lee)
+- use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau)
+- added makelcc.bat for lcc-win32 (Tom St Denis)
+- in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe)
+- Avoid expanded $Id$. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion.
+- check for unistd.h in configure (for off_t)
+- use Tracev instead of Trace in infblock.c
+- remove useless check parameter in inflate_blocks_free
+- avoid useless assignment of s->check to itself in inflate_blocks_new
+- do not flush twice in gzclose (thanks to Ken Raeburn)
+- rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h
+- use NO_ERRNO_H instead of enumeration of operating systems with errno.h
+- work around buggy fclose on pipes for HP/UX
+- support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson)
+- fix configure if CC is already equal to gcc
+
+Changes in 1.0.5 (3 Jan 98)
+- Fix inflate to terminate gracefully when fed corrupted or invalid data
+- Use const for rommable constants in inflate
+- Eliminate memory leaks on error conditions in inflate
+- Removed some vestigial code in inflate
+- Update web address in README
+  
+Changes in 1.0.4 (24 Jul 96)
+- In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
+  bit, so the decompressor could decompress all the correct data but went
+  on to attempt decompressing extra garbage data. This affected minigzip too.
+- zlibVersion and gzerror return const char* (needed for DLL)
+- port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
+- use z_error only for DEBUG (avoid problem with DLLs)
+
+Changes in 1.0.3 (2 Jul 96)
+- use z_streamp instead of z_stream *, which is now a far pointer in MSDOS
+  small and medium models; this makes the library incompatible with previous
+  versions for these models. (No effect in large model or on other systems.)
+- return OK instead of BUF_ERROR if previous deflate call returned with
+  avail_out as zero but there is nothing to do
+- added memcmp for non STDC compilers
+- define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly)
+- define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO)
+- better check for 16-bit mode MSC (avoids problem with Symantec)
+
+Changes in 1.0.2 (23 May 96)
+- added Windows DLL support
+- added a function zlibVersion (for the DLL support)
+- fixed declarations using Bytef in infutil.c (pb with MSDOS medium model)
+- Bytef is define's instead of typedef'd only for Borland C
+- avoid reading uninitialized memory in example.c
+- mention in README that the zlib format is now RFC1950
+- updated Makefile.dj2
+- added algorithm.doc
+
+Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
+- fix array overlay in deflate.c which sometimes caused bad compressed data
+- fix inflate bug with empty stored block
+- fix MSDOS medium model which was broken in 0.99
+- fix deflateParams() which could generated bad compressed data.
+- Bytef is define'd instead of typedef'ed (work around Borland bug)
+- added an INDEX file
+- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
+  Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
+- speed up adler32 for modern machines without auto-increment
+- added -ansi for IRIX in configure
+- static_init_done in trees.c is an int
+- define unlink as delete for VMS
+- fix configure for QNX
+- add configure branch for SCO and HPUX
+- avoid many warnings (unused variables, dead assignments, etc...)
+- no fdopen for BeOS
+- fix the Watcom fix for 32 bit mode (define FAR as empty)
+- removed redefinition of Byte for MKWERKS
+- work around an MWKERKS bug (incorrect merge of all .h files)
+
+Changes in 0.99 (27 Jan 96)
+- allow preset dictionary shared between compressor and decompressor
+- allow compression level 0 (no compression)
+- add deflateParams in zlib.h: allow dynamic change of compression level
+  and compression strategy.
+- test large buffers and deflateParams in example.c
+- add optional "configure" to build zlib as a shared library
+- suppress Makefile.qnx, use configure instead
+- fixed deflate for 64-bit systems (detected on Cray)
+- fixed inflate_blocks for 64-bit systems (detected on Alpha)
+- declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
+- always return Z_BUF_ERROR when deflate() has nothing to do
+- deflateInit and inflateInit are now macros to allow version checking
+- prefix all global functions and types with z_ with -DZ_PREFIX
+- make falloc completely reentrant (inftrees.c)
+- fixed very unlikely race condition in ct_static_init
+- free in reverse order of allocation to help memory manager
+- use zlib-1.0/* instead of zlib/* inside the tar.gz
+- make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
+  -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
+- allow gzread on concatenated .gz files
+- deflateEnd now returns Z_DATA_ERROR if it was premature
+- deflate is finally (?) fully deterministic (no matches beyond end of input)
+- Document Z_SYNC_FLUSH
+- add uninstall in Makefile
+- Check for __cpluplus in zlib.h
+- Better test in ct_align for partial flush
+- avoid harmless warnings for Borland C++
+- initialize hash_head in deflate.c
+- avoid warning on fdopen (gzio.c) for HP cc -Aa
+- include stdlib.h for STDC compilers
+- include errno.h for Cray
+- ignore error if ranlib doesn't exist
+- call ranlib twice for NeXTSTEP
+- use exec_prefix instead of prefix for libz.a
+- renamed ct_* as _tr_* to avoid conflict with applications
+- clear z->msg in inflateInit2 before any error return
+- initialize opaque in example.c, gzio.c, deflate.c and inflate.c
+- fixed typo in zconf.h (_GNUC__ => __GNUC__)
+- check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
+- fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
+- in fcalloc, normalize pointer if size > 65520 bytes
+- don't use special fcalloc for 32 bit Borland C++
+- use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
+- use Z_BINARY instead of BINARY
+- document that gzclose after gzdopen will close the file
+- allow "a" as mode in gzopen.
+- fix error checking in gzread
+- allow skipping .gz extra-field on pipes
+- added reference to Perl interface in README
+- put the crc table in FAR data (I dislike more and more the medium model :)
+- added get_crc_table
+- added a dimension to all arrays (Borland C can't count).
+- workaround Borland C bug in declaration of inflate_codes_new & inflate_fast
+- guard against multiple inclusion of *.h (for precompiled header on Mac)
+- Watcom C pretends to be Microsoft C small model even in 32 bit mode.
+- don't use unsized arrays to avoid silly warnings by Visual C++:
+     warning C4746: 'inflate_mask' : unsized array treated as  '__far'
+     (what's wrong with far data in far model?).
+- define enum out of inflate_blocks_state to allow compilation with C++
+
+Changes in 0.95 (16 Aug 95)
+- fix MSDOS small and medium model (now easier to adapt to any compiler)
+- inlined send_bits
+- fix the final (:-) bug for deflate with flush (output was correct but
+  not completely flushed in rare occasions).
+- default window size is same for compression and decompression
+  (it's now sufficient to set MAX_WBITS in zconf.h).
+- voidp -> voidpf and voidnp -> voidp (for consistency with other
+  typedefs and because voidnp was not near in large model).
+
 Changes in 0.94 (13 Aug 95)
 - support MSDOS medium model
 - fix deflate with flush (could sometimes generate bad output)
@@ -10,6 +228,7 @@ Changes in 0.94 (13 Aug 95)
 - gzflush now calls fflush
 - For deflate with flush, flush even if no more input is provided.
 - rename libgz.a as libz.a
+- avoid complex expression in infcodes.c triggering Turbo C bug
 - work around a problem with gcc on Alpha (in INSERT_STRING)
 - don't use inline functions (problem with some gcc versions)
 - allow renaming of Byte, uInt, etc... with #define.

INDEX

@@ -0,0 +1,74 @@
+ChangeLog		history of changes
+INDEX			this file
+Make_vms.com		script for Vax/VMS
+Makefile		makefile for Unix (generated by configure)
+Makefile.in		makefile for Unix (template for configure)
+Makefile.msc		makefile for Microsoft C 16-bit
+Makefile.riscos 	makefile for RISCOS
+Makefile.sas		makefile for Amiga SAS/C
+README			guess what
+algorithm.txt		description of the (de)compression algorithm
+configure		configure script for Unix
+descrip.mms		makefile for Vax/VMS
+zlib.3			mini man page for zlib (volunteers to write full
+			man pages from zlib.h welcome. write to jloup@gzip.org)
+
+msdos/Makefile.b32	makefile for Borland C++   32-bit
+msdos/Makefile.bor	makefile for Borland C/C++ 16-bit
+msdos/Makefile.dj2	makefile for DJGPP 2.x
+msdos/Makefile.tc	makefile for Turbo C
+msdos/Makefile.wat	makefile for Watcom C
+msdos/zlib.def        	definition file for Windows DLL
+msdos/zlib.rc         	definition file for Windows DLL
+
+nt/Makefile.nt		makefile for Windows NT
+nt/zlib.dnt		definition file for Windows NT DLL
+
+
+		zlib public header files (must be kept):
+zconf.h
+zlib.h
+
+		private source files used to build the zlib library:
+adler32.c
+compress.c
+crc32.c
+deflate.c
+deflate.h
+gzio.c
+infblock.c
+infblock.h
+infcodes.c
+infcodes.h
+inffast.c
+inffast.h
+inflate.c
+inftrees.c
+inftrees.h
+infutil.c
+infutil.h
+trees.c
+uncompr.c
+zutil.c
+zutil.h
+
+		source files for sample programs:
+example.c
+minigzip.c
+
+		unsupported contribution by third parties
+
+contrib/asm386/ by Gilles Vollant <info@winimage.com>
+	386 asm code replacing longest_match().
+
+contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+
+contrib/iostream2/  by Tyge L<>vset <Tyge.Lovset@cmr.no>
+	Another C++ I/O streams interface
+
+contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+	A very simple tar.gz extractor using zlib
+
+contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.

Make_vms.com

@@ -4,7 +4,7 @@ $!
 $! Look for the compiler used
 $!
 $ ccopt = ""
-$ if f$trnlnm("HW_MODEL").ge.1024
+$ if f$getsyi("HW_MODEL").ge.1024
 $ then
 $  ccopt = "/prefix=all"+ccopt
 $  comp  = "__decc__=1"

Makefile

@@ -1,72 +1,145 @@
 # Makefile for zlib
-# Copyright (C) 1995 Jean-loup Gailly.
+# Copyright (C) 1995-1998 Jean-loup Gailly.
 # For conditions of distribution and use, see copyright notice in zlib.h 
 
-CC=cc
+# To compile and test, type:
-CFLAGS=-O
+#   ./configure; make test
-#use -O3 for gcc to take advantage of inlining
+# The call of configure is optional if you don't have special requirements
-#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
-#CFLAGS=-g -DDEBUG
-LDFLAGS=-L. -lz
 
+# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
+#    make install
+# To install in $HOME instead of /usr/local, use:
+#    make install prefix=$HOME
+
+CC=cc
+
+CFLAGS=-O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DDEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+
+LDFLAGS=-L. -lz
+LDSHARED=$(CC)
+
+VER=1.0.7
+LIBS=libz.a
+SHAREDLIB=libz.so
+
+AR=ar rc
 RANLIB=ranlib
+TAR=tar
+SHELL=/bin/sh
 
 prefix=/usr/local
+exec_prefix = $(prefix)
 
 OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
        zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
 
 TEST_OBJS = example.o minigzip.o
 
+DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
+  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
+  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
+  contrib/asm386/*.asm contrib/asm386/*.c \
+  contrib/asm386/*.bat contrib/asm386/*.mak contrib/iostream/*.cpp \
+  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
+  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
+
 all: example minigzip
 
 test: all
-	./example
+	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	./example ; \
 	echo hello world | ./minigzip | ./minigzip -d
 
-install: libz.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp zlib.h zconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
-	cp libz.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libz.a
-
 libz.a: $(OBJS)
-	ar rc $@ $(OBJS)
+	$(AR) $@ $(OBJS)
-	$(RANLIB) $@
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
-example: example.o libz.a
+$(SHAREDLIB).$(VER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
+
+example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
 
-minigzip: minigzip.o libz.a
+minigzip: minigzip.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
 
+install: $(LIBS)
+	-@if [ ! $(prefix)/include  ]; then mkdir $(prefix)/include; fi
+	-@if [ ! $(exec_prefix)/lib ]; then mkdir $(exec_prefix)/lib; fi
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp $(LIBS) $(exec_prefix)/lib
+	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
+	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
+	  rm -f $(SHAREDLIB) $(SHAREDLIB).1; \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).1; \
+	  (ldconfig || true)  >/dev/null 2>&1; \
+	fi
+# The ranlib in install is needed on NeXTSTEP which checks file times
+# ldconfig is for Linux
+
+uninstall:
+	cd $(exec_prefix)/lib; rm -f $(LIBS); \
+	if test -f $(SHAREDLIB); then \
+	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	 rm -f $(SHAREDLIB).$$v $(SHAREDLIB); \
+	fi
+	cdz $(prefix)/include; rm -f zlib.h zconf.h
+
 clean:
-	rm -f *.o example minigzip libz.a foo.gz
+	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
+
+distclean:	clean
 
 zip:
-	zip -ul9 zlib README ChangeLog Makefile Make????.??? Makefile.?? \
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
-	  descrip.mms *.[ch]
+	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	zip -ul9 zlib$$v $(DISTFILES)
+	mv Makefile~ Makefile
 
-tgz:
+dist:
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
-	  zlib/Make????.??? zlib/Makefile.?? zlib/descrip.mms zlib/*.[ch]
+	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	rm -f $$d.tar.gz; \
+	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
+	files=""; \
+	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
+	cd ..; \
+	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
+	if test ! -d $$d; then rm -f $$d; fi
+	mv Makefile~ Makefile
+
+tags:	
+	etags *.[ch]
+
+depend:
+	makedepend -- $(CFLAGS) -- *.[ch]
 
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
-adler32.o: zutil.h zlib.h zconf.h
+adler32.o: zlib.h zconf.h
 compress.o: zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h
+crc32.o: zlib.h zconf.h
 deflate.o: deflate.h zutil.h zlib.h zconf.h
 example.o: zlib.h zconf.h
 gzio.o: zutil.h zlib.h zconf.h
-infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+infcodes.o: zutil.h zlib.h zconf.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h
+inffast.o: infblock.h infcodes.h infutil.h inffast.h
 inflate.o: zutil.h zlib.h zconf.h infblock.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
+infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
 minigzip.o:  zlib.h zconf.h 
 trees.o: deflate.h zutil.h zlib.h zconf.h 
 uncompr.o: zlib.h zconf.h

Makefile.in

@@ -0,0 +1,146 @@
+# Makefile for zlib
+# Copyright (C) 1995-1998 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h 
+
+# To compile and test, type:
+#   ./configure; make test
+# The call of configure is optional if you don't have special requirements
+
+# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
+#    make install
+# To install in $HOME instead of /usr/local, use:
+#    make install prefix=$HOME
+
+CC=cc
+
+CFLAGS=-O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DDEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+
+LDFLAGS=-L. -lz
+LDSHARED=$(CC)
+
+VER=1.0.7
+LIBS=libz.a
+SHAREDLIB=libz.so
+
+AR=ar rc
+RANLIB=ranlib
+TAR=tar
+SHELL=/bin/sh
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
+  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
+  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
+  contrib/asm386/*.asm contrib/asm386/*.c \
+  contrib/asm386/*.bat contrib/asm386/*.mak contrib/iostream/*.cpp \
+  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
+  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
+
+all: example minigzip
+
+test: all
+	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	./example ; \
+	echo hello world | ./minigzip | ./minigzip -d
+
+libz.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
+
+$(SHAREDLIB).$(VER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
+
+example: example.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
+
+minigzip: minigzip.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
+
+install: $(LIBS)
+	-@if [ ! $(prefix)/include  ]; then mkdir $(prefix)/include; fi
+	-@if [ ! $(exec_prefix)/lib ]; then mkdir $(exec_prefix)/lib; fi
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp $(LIBS) $(exec_prefix)/lib
+	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
+	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
+	  rm -f $(SHAREDLIB) $(SHAREDLIB).1; \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).1; \
+	  (ldconfig || true)  >/dev/null 2>&1; \
+	fi
+# The ranlib in install is needed on NeXTSTEP which checks file times
+# ldconfig is for Linux
+
+uninstall:
+	cd $(exec_prefix)/lib; rm -f $(LIBS); \
+	if test -f $(SHAREDLIB); then \
+	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	 rm -f $(SHAREDLIB).$$v $(SHAREDLIB); \
+	fi
+	cdz $(prefix)/include; rm -f zlib.h zconf.h
+
+clean:
+	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
+
+distclean:	clean
+
+zip:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	zip -ul9 zlib$$v $(DISTFILES)
+	mv Makefile~ Makefile
+
+dist:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	rm -f $$d.tar.gz; \
+	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
+	files=""; \
+	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
+	cd ..; \
+	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
+	if test ! -d $$d; then rm -f $$d; fi
+	mv Makefile~ Makefile
+
+tags:	
+	etags *.[ch]
+
+depend:
+	makedepend -- $(CFLAGS) -- *.[ch]
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzio.o: zutil.h zlib.h zconf.h
+infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
+infcodes.o: zutil.h zlib.h zconf.h
+infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h
+inffast.o: infblock.h infcodes.h infutil.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h infblock.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+minigzip.o:  zlib.h zconf.h 
+trees.o: deflate.h zutil.h zlib.h zconf.h 
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h  

Makefile.qnx

@@ -1,75 +0,0 @@
-# Makefile for zlib
-# Copyright (C) 1995 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h 
-
-# Modified slightly for QNX by Chris Herborth (chrish@qnx.com)
-
-CC=cc
-CFLAGS=-4 -O -Q
-#use -O3 for gcc to take advantage of inlining
-#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
-#CFLAGS=-g -DDEBUG
-LDFLAGS=-L. -lz
-
-#RANLIB=ranlib
-
-prefix=/usr/local
-
-OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
-
-TEST_OBJS = example.o minigzip.o
-
-all: example minigzip
-
-test: all
-	./example
-	echo hello world | ./minigzip | ./minigzip -d 
-
-install: zlib.lib
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp zlib.h zconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
-	cp zlib.lib $(prefix)/lib
-	chmod 644 $(prefix)/lib/zlib.lib
-
-zlib.lib: $(OBJS)
-	cc -A $@ $(OBJS)
-#	ar rc $@ $(OBJS)
-#	$(RANLIB) $@
-
-example: example.o zlib.lib
-	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
-
-minigzip: minigzip.o zlib.lib
-	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
-
-clean:
-	rm -f *.o example minigzip zlib.lib foo.gz
-
-zip:
-	zip -ul9 zlib README ChangeLog Makefile Makefile.??? Makefile.?? *.[ch]
-
-tgz:
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-		zlib/Makefile.??? zlib/Makefile.?? zlib/*.[ch]
-
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-
-adler32.o: zutil.h zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzio.o: zutil.h zlib.h zconf.h
-infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h infblock.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h

Makefile.riscos

@@ -0,0 +1,46 @@
+# Project:   zlib_1_03
+
+
+# Toolflags:
+CCflags = -c -depend !Depend -IC: -g -throwback  -DRISCOS  -fnah 
+C++flags = -c -depend !Depend -IC: -throwback
+Linkflags = -aif -c++ -o $@ 
+ObjAsmflags = -throwback -NoCache -depend !Depend
+CMHGflags = 
+LibFileflags = -c -l -o $@ 
+Squeezeflags = -o $@
+
+
+# Final targets:
+@.zlib_lib:   @.o.adler32 @.o.compress @.o.crc32 @.o.deflate @.o.gzio \
+        @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil @.o.trees \
+        @.o.uncompress @.o.zutil 
+        LibFile $(LibFileflags) @.o.adler32 @.o.compress @.o.crc32 @.o.deflate \
+        @.o.gzio @.o.infblock @.o.infcodes @.o.inffast @.o.inflate @.o.inftrees @.o.infutil \
+        @.o.trees @.o.uncompress @.o.zutil 
+@.test:   @.tests.minigzip @.tests.example 
+        echo Please run "Test" in directory tests 
+@.tests.minigzip:   @.o.minigzip @.zlib_lib C:o.Stubs 
+        Link $(Linkflags) @.o.minigzip @.zlib_lib C:o.Stubs 
+@.tests.example:   @.o.example @.zlib_lib C:o.Stubs 
+        Link $(Linkflags) @.o.example @.zlib_lib C:o.Stubs 
+
+
+# User-editable dependencies:
+.c.o:
+        cc $(ccflags) -o $@ $<
+
+# Static dependencies:
+@.o.example:   @.tests.c.example
+        cc $(ccflags) -o @.o.example @.tests.c.example 
+@.o.minigzip:   @.tests.c.minigzip
+        cc $(ccflags) -o @.o.minigzip @.tests.c.minigzip 
+
+
+# Dynamic dependencies:
+o.minigzip:	tests.c.minigzip
+o.minigzip:	h.zlib
+o.minigzip:	h.zconf
+o.example:	tests.c.example
+o.example:	h.zlib
+o.example:	h.zconf

Makefile.sas

@@ -0,0 +1,64 @@
+# SMakefile for zlib
+# Modified from the standard UNIX Makefile Copyright Jean-loup Gailly
+# Osma Ahvenlampi <Osma.Ahvenlampi@hut.fi>
+# Amiga, SAS/C 6.56 & Smake
+
+CC=sc
+CFLAGS=OPT
+#CFLAGS=OPT CPU=68030
+#CFLAGS=DEBUG=LINE
+LDFLAGS=LIB z.lib
+
+SCOPTIONS=OPTSCHED OPTINLINE OPTALIAS OPTTIME OPTINLOCAL STRMERGE \
+       NOICONS PARMS=BOTH NOSTACKCHECK UTILLIB NOVERSION ERRORREXX 
+
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: SCOPTIONS example minigzip
+
+test: all
+	`cd`/example
+	echo hello world | minigzip | minigzip -d 
+
+install: z.lib
+	copy zlib.h zconf.h INCLUDE: clone
+	copy z.lib LIB: clone
+
+z.lib: $(OBJS)
+	oml z.lib r $(OBJS)
+
+example: example.o z.lib
+	$(CC) $(CFLAGS) LINK TO $@ example.o $(LDFLAGS)
+
+minigzip: minigzip.o z.lib
+	$(CC) $(CFLAGS) LINK TO $@ minigzip.o $(LDFLAGS)
+
+clean:
+	-delete force quiet *.o example minigzip z.lib foo.gz *.lnk SCOPTIONS
+
+SCOPTIONS: Smakefile
+        copy to $@ <from <
+$(SCOPTIONS)
+<
+
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+
+adler32.o: zutil.h zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: zutil.h zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzio.o: zutil.h zlib.h zconf.h
+infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h infblock.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
+minigzip.o: zlib.h zconf.h
+trees.o: deflate.h zutil.h zlib.h zconf.h
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h

README

@@ -1,41 +1,95 @@
-zlib 0.94 is a beta version of a general purpose compression library.
+zlib 1.0.7 is a general purpose data compression library.  All the code
-Unless new bugs are found it will be released again as the first official
+is reentrant (thread safe).  The data format used by the zlib library
-version (1.0). This version has no known bugs.
+is described by RFCs (Request for Comments) 1950 to 1952 in the files 
-
+ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
-The data format used by the zlib library is described in the
+format) and rfc1952.txt (gzip format). These documents are also available in
-files zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
+other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
-in ftp.uu.net:/pub/archiving/zip/doc.
 
 All functions of the compression library are documented in the file
 zlib.h. A usage example of the library is given in the file example.c
-which also tests that the library is working correctly.
+which also tests that the library is working correctly. Another
+example is given in the file minigzip.c. The compression library itself
+is composed of all source files except example.c and minigzip.c.
 
-To compile all files and run the test program, just type: make test
+To compile all files and run the test program, follow the instructions
-(For MSDOS, use one of the special makefiles such as Makefile.msc.)
+given at the top of Makefile. In short "make test; make install"
-To install the zlib library (libz.a) in /usr/local/lib, type: make install
+should work for most machines.  For MSDOS, use one of the special
-To install in a different directory, use for example:
+makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
-  make install prefix=$HOME
-This will install in $HOME/lib instead of /usr/local/lib.
 
-The changes made in version 0.94 are documented in the file ChangeLog.
+Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
-The main changes since 0.93 are:
+if this fails, to the addresses given below in the Copyright section.
-- support MSDOS small and medium model
+The zlib home page is http://www.cdrom.com/pub/infozip/zlib/
-- fix deflate with flush (could sometimes generate bad output)
+The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/
-- fix deflateReset (zlib header was incorrectly suppressed)
+Mark Nelson wrote an article about zlib for the Jan. 1997 issue of 
-- added support for VMS
+Dr. Dobb's Journal; a copy of the article is available in
-- allow a compression level in gzopen()
+http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
-- gzflush now calls fflush
-- For deflate with flush, flush even if no more input is provided.
-- rename libgz.a as libz.a
 
-For MSDOS, the small and medium models are supported only for Microsoft C.
+The changes made in version 1.0.7 are documented in the file ChangeLog.
-(It should be easy to support them for Borland C also, but I don't have
+The main changes since 1.0.6 are:
-a recent Borland compiler to test with.) The small model currently works
+
-for Turbo/Borland C but only with reduced performance to avoid any far
+- fix gzseek which was broken in write mode
-allocation (tested with -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3).
+- return error for gzseek to negative absolute position
+- fix configure for Linux (Chun-Chung Chen)
+- increase stack space for MSC (Tim Wegner)
+- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
+- define EXPORTVA for gzprintf (Gilles Vollant)
+- added mini man page zlib.3 (Rick Rodgers) [volunteers to write full
+  man pages from zlib.h most welcome. write to jloup@gzip.org]
+- for contrib/untgz, fix makedir() and improve Makefile
+
+Unsupported third party contributions are provided in directory "contrib".
+
+A Java implementation of zlib is available in the Java Development Kit 1.1
+http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
+See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details.
+
+A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
+is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
+ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
+
+A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
+is available from the Python Software Association sites, such as:
+ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
+
+Notes for some targets:
+
+- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
+  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
+  The zlib DLL support was initially done by Alessandro Iacopetti and is
+  now maintained by Gilles Vollant <info@winimage.com>. Check the zlib DLL
+  home page at http://www.winimage.com/zLibDll
+
+  From Visual Basic, you can call the DLL functions which do not take
+  a structure as argument: compress, uncompress and all gz* functions.
+  See contrib/visual-basic.txt for more information.
+  I don't know how to handle structures in Visual Basic, sorry.
+
+- For 64-bit Irix, deflate.c must be compiled without any optimization.
+  With -O, one libpng test fails. The test works in 32 bit mode (with
+  the -n32 compiler flag). The compiler bug has been reported to SGI.
+
+- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1   
+  it works when compiled with cc.
+
+- zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not
+  accepting the -O option). It works with the other cc compiler.
+
+- gzdopen is not supported on RISCOS
+
+- For Turbo C the small model is supported only with reduced performance to
+  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 
 
- (C) 1995 Jean-loup Gailly and Mark Adler
+Acknowledgments:
+
+  The deflate format used by zlib was defined by Phil Katz. The deflate
+  and zlib specifications were written by Peter Deutsch. Thanks to all the
+  people who reported problems and suggested various improvements in zlib;
+  they are too numerous to cite here.
+
+Copyright notice:
+
+ (C) 1995-1998 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -54,7 +108,7 @@ allocation (tested with -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3).
   3. This notice may not be removed or altered from any source distribution.
 
   Jean-loup Gailly        Mark Adler
-  gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
+  jloup@gzip.org          madler@alumni.caltech.edu
 
 If you use the zlib library in a product, we would appreciate *not*
 receiving lengthy legal documents to sign. The sources are provided

adler32.c

@@ -1,9 +1,9 @@
 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: adler32.c,v 1.6 1995/05/03 17:27:08 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -11,16 +11,16 @@
 #define NMAX 5552
 /* NMAX is the largest n such that 255n(n+1)/2 + (n+1)(BASE-1) <= 2^32-1 */
 
-#define DO1(buf)  {s1 += *buf++; s2 += s1;}
+#define DO1(buf,i)  {s1 += buf[i]; s2 += s1;}
-#define DO2(buf)  DO1(buf); DO1(buf);
+#define DO2(buf,i)  DO1(buf,i); DO1(buf,i+1);
-#define DO4(buf)  DO2(buf); DO2(buf);
+#define DO4(buf,i)  DO2(buf,i); DO2(buf,i+2);
-#define DO8(buf)  DO4(buf); DO4(buf);
+#define DO8(buf,i)  DO4(buf,i); DO4(buf,i+4);
-#define DO16(buf) DO8(buf); DO8(buf);
+#define DO16(buf)   DO8(buf,0); DO8(buf,8);
 
 /* ========================================================================= */
-uLong adler32(adler, buf, len)
+uLong EXPORT adler32(adler, buf, len)
     uLong adler;
-    Bytef *buf;
+    const Bytef *buf;
     uInt len;
 {
     unsigned long s1 = adler & 0xffff;
@@ -34,10 +34,12 @@ uLong adler32(adler, buf, len)
         len -= k;
         while (k >= 16) {
             DO16(buf);
+	    buf += 16;
             k -= 16;
         }
         if (k != 0) do {
-            DO1(buf);
+            s1 += *buf++;
+	    s2 += s1;
         } while (--k);
         s1 %= BASE;
         s2 %= BASE;

algorithm.txt

@@ -0,0 +1,213 @@
+1. Compression algorithm (deflate)
+
+The deflation algorithm used by gzip (also zip and zlib) is a variation of
+LZ77 (Lempel-Ziv 1977, see reference below). It finds duplicated strings in
+the input data.  The second occurrence of a string is replaced by a
+pointer to the previous string, in the form of a pair (distance,
+length).  Distances are limited to 32K bytes, and lengths are limited
+to 258 bytes. When a string does not occur anywhere in the previous
+32K bytes, it is emitted as a sequence of literal bytes.  (In this
+description, `string' must be taken as an arbitrary sequence of bytes,
+and is not restricted to printable characters.)
+
+Literals or match lengths are compressed with one Huffman tree, and
+match distances are compressed with another tree. The trees are stored
+in a compact form at the start of each block. The blocks can have any
+size (except that the compressed data for one block must fit in
+available memory). A block is terminated when deflate() determines that
+it would be useful to start another block with fresh trees. (This is
+somewhat similar to the behavior of LZW-based _compress_.)
+
+Duplicated strings are found using a hash table. All input strings of
+length 3 are inserted in the hash table. A hash index is computed for
+the next 3 bytes. If the hash chain for this index is not empty, all
+strings in the chain are compared with the current input string, and
+the longest match is selected.
+
+The hash chains are searched starting with the most recent strings, to
+favor small distances and thus take advantage of the Huffman encoding.
+The hash chains are singly linked. There are no deletions from the
+hash chains, the algorithm simply discards matches that are too old.
+
+To avoid a worst-case situation, very long hash chains are arbitrarily
+truncated at a certain length, determined by a runtime option (level
+parameter of deflateInit). So deflate() does not always find the longest
+possible match but generally finds a match which is long enough.
+
+deflate() also defers the selection of matches with a lazy evaluation
+mechanism. After a match of length N has been found, deflate() searches for
+a longer match at the next input byte. If a longer match is found, the
+previous match is truncated to a length of one (thus producing a single
+literal byte) and the process of lazy evaluation begins again. Otherwise,
+the original match is kept, and the next match search is attempted only N
+steps later.
+
+The lazy match evaluation is also subject to a runtime parameter. If
+the current match is long enough, deflate() reduces the search for a longer
+match, thus speeding up the whole process. If compression ratio is more
+important than speed, deflate() attempts a complete second search even if
+the first match is already long enough.
+
+The lazy match evaluation is not performed for the fastest compression
+modes (level parameter 1 to 3). For these fast modes, new strings
+are inserted in the hash table only when no match was found, or
+when the match is not too long. This degrades the compression ratio
+but saves time since there are both fewer insertions and fewer searches.
+
+
+2. Decompression algorithm (inflate)
+
+2.1 Introduction
+
+The real question is, given a Huffman tree, how to decode fast.  The most
+important realization is that shorter codes are much more common than
+longer codes, so pay attention to decoding the short codes fast, and let
+the long codes take longer to decode.
+
+inflate() sets up a first level table that covers some number of bits of
+input less than the length of longest code.  It gets that many bits from the
+stream, and looks it up in the table.  The table will tell if the next
+code is that many bits or less and how many, and if it is, it will tell
+the value, else it will point to the next level table for which inflate()
+grabs more bits and tries to decode a longer code.
+
+How many bits to make the first lookup is a tradeoff between the time it
+takes to decode and the time it takes to build the table.  If building the
+table took no time (and if you had infinite memory), then there would only
+be a first level table to cover all the way to the longest code.  However,
+building the table ends up taking a lot longer for more bits since short
+codes are replicated many times in such a table.  What inflate() does is
+simply to make the number of bits in the first table a variable, and set it
+for the maximum speed.
+
+inflate() sends new trees relatively often, so it is possibly set for a
+smaller first level table than an application that has only one tree for
+all the data.  For inflate, which has 286 possible codes for the
+literal/length tree, the size of the first table is nine bits.  Also the
+distance trees have 30 possible values, and the size of the first table is
+six bits.  Note that for each of those cases, the table ended up one bit
+longer than the ``average'' code length, i.e. the code length of an
+approximately flat code which would be a little more than eight bits for
+286 symbols and a little less than five bits for 30 symbols.  It would be
+interesting to see if optimizing the first level table for other
+applications gave values within a bit or two of the flat code size.
+
+
+2.2 More details on the inflate table lookup
+
+Ok, you want to know what this cleverly obfuscated inflate tree actually  
+looks like.  You are correct that it's not a Huffman tree.  It is simply a  
+lookup table for the first, let's say, nine bits of a Huffman symbol.  The  
+symbol could be as short as one bit or as long as 15 bits.  If a particular  
+symbol is shorter than nine bits, then that symbol's translation is duplicated
+in all those entries that start with that symbol's bits.  For example, if the  
+symbol is four bits, then it's duplicated 32 times in a nine-bit table.  If a  
+symbol is nine bits long, it appears in the table once.
+
+If the symbol is longer than nine bits, then that entry in the table points  
+to another similar table for the remaining bits.  Again, there are duplicated  
+entries as needed.  The idea is that most of the time the symbol will be short
+and there will only be one table look up.  (That's whole idea behind data  
+compression in the first place.)  For the less frequent long symbols, there  
+will be two lookups.  If you had a compression method with really long  
+symbols, you could have as many levels of lookups as is efficient.  For  
+inflate, two is enough.
+
+So a table entry either points to another table (in which case nine bits in  
+the above example are gobbled), or it contains the translation for the symbol  
+and the number of bits to gobble.  Then you start again with the next  
+ungobbled bit.
+
+You may wonder: why not just have one lookup table for how ever many bits the  
+longest symbol is?  The reason is that if you do that, you end up spending  
+more time filling in duplicate symbol entries than you do actually decoding.   
+At least for deflate's output that generates new trees every several 10's of  
+kbytes.  You can imagine that filling in a 2^15 entry table for a 15-bit code  
+would take too long if you're only decoding several thousand symbols.  At the  
+other extreme, you could make a new table for every bit in the code.  In fact,
+that's essentially a Huffman tree.  But then you spend two much time  
+traversing the tree while decoding, even for short symbols.
+
+So the number of bits for the first lookup table is a trade of the time to  
+fill out the table vs. the time spent looking at the second level and above of
+the table.
+
+Here is an example, scaled down:
+
+The code being decoded, with 10 symbols, from 1 to 6 bits long:
+
+A: 0
+B: 10
+C: 1100
+D: 11010
+E: 11011
+F: 11100
+G: 11101
+H: 11110
+I: 111110
+J: 111111
+
+Let's make the first table three bits long (eight entries):
+
+000: A,1
+001: A,1
+010: A,1
+011: A,1
+100: B,2
+101: B,2
+110: -> table X (gobble 3 bits)
+111: -> table Y (gobble 3 bits)
+
+Each entry is what the bits decode to and how many bits that is, i.e. how  
+many bits to gobble.  Or the entry points to another table, with the number of
+bits to gobble implicit in the size of the table.
+
+Table X is two bits long since the longest code starting with 110 is five bits
+long:
+
+00: C,1
+01: C,1
+10: D,2
+11: E,2
+
+Table Y is three bits long since the longest code starting with 111 is six  
+bits long:
+
+000: F,2
+001: F,2
+010: G,2
+011: G,2
+100: H,2
+101: H,2
+110: I,3
+111: J,3
+
+So what we have here are three tables with a total of 20 entries that had to  
+be constructed.  That's compared to 64 entries for a single table.  Or  
+compared to 16 entries for a Huffman tree (six two entry tables and one four  
+entry table).  Assuming that the code ideally represents the probability of  
+the symbols, it takes on the average 1.25 lookups per symbol.  That's compared
+to one lookup for the single table, or 1.66 lookups per symbol for the  
+Huffman tree.
+
+There, I think that gives you a picture of what's going on.  For inflate, the  
+meaning of a particular symbol is often more than just a letter.  It can be a  
+byte (a "literal"), or it can be either a length or a distance which  
+indicates a base value and a number of bits to fetch after the code that is  
+added to the base value.  Or it might be the special end-of-block code.  The  
+data structures created in inftrees.c try to encode all that information  
+compactly in the tables.
+
+
+Jean-loup Gailly        Mark Adler
+jloup@gzip.org          madler@alumni.caltech.edu
+
+
+References:
+
+[LZ77] Ziv J., Lempel A., ``A Universal Algorithm for Sequential Data
+Compression,'' IEEE Transactions on Information Theory, Vol. 23, No. 3,
+pp. 337-343.
+
+``DEFLATE Compressed Data Format Specification'' available in
+ftp://ds.internic.net/rfc/rfc1951.txt

compress.c

@@ -1,9 +1,9 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: compress.c,v 1.6 1995/05/03 17:27:08 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -19,26 +19,28 @@
    enough memory, Z_BUF_ERROR if there was not enough room in the output
    buffer.
 */
-int compress (dest, destLen, source, sourceLen)
+int EXPORT compress (dest, destLen, source, sourceLen)
     Bytef *dest;
     uLongf *destLen;
-    Bytef *source;
+    const Bytef *source;
     uLong sourceLen;
 {
     z_stream stream;
     int err;
 
-    stream.next_in = source;
+    stream.next_in = (Bytef*)source;
     stream.avail_in = (uInt)sourceLen;
+#ifdef MAXSEG_64K
     /* Check for source > 64K on 16-bit machine: */
     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
-
+#endif
     stream.next_out = dest;
     stream.avail_out = (uInt)*destLen;
     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 
     stream.zalloc = (alloc_func)0;
     stream.zfree = (free_func)0;
+    stream.opaque = (voidpf)0;
 
     err = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
     if (err != Z_OK) return err;

configure

@@ -0,0 +1,121 @@
+#!/bin/sh
+# configure script for zlib. This script is needed only if
+# you wish to build a shared library and your system supports them,
+# of if you need special compiler, flags or install directory.
+# Otherwise, you can just use directly "make test; make install"
+#
+# To create a shared library, use "configure --shared"; by default a static
+# library is created. If the primitive shared library support provided here
+# does not work, use ftp://prep.ai.mit.edu/pub/gnu/libtool-*.tar.gz
+#
+# To impose specific compiler or flags or install directory, use for example:
+#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
+# or for csh/tcsh users:
+#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
+# LDSHARED is the command to be used to create a shared library
+
+LIBS=libz.a
+SHAREDLIB=libz.so
+VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`
+AR=${AR-"ar rc"}
+RANLIB=${RANLIB-"ranlib"}
+prefix=${prefix-/usr/local}
+exec_prefix=${exec_prefix-$prefix}
+shared_ext='.so'
+shared=0
+
+case "$1" in
+  -s* | --s*) shared=1; shift;;
+  -h* | --h*) echo 'syntax: configure [ --shared ]'; exit 0;;
+esac
+
+test -z "$CC" && echo Checking for gcc...
+test=ztest$$
+cat > $test.c <<EOF
+int hello() { printf("hello\n"); }
+EOF
+if test -z "$CC" -o "$CC" = "gcc" && (gcc -c -O3 $test.c) 2>/dev/null; then
+  CC=gcc
+  SFLAGS=${CFLAGS-"-fPIC -O3"}
+  CFLAGS=${CFLAGS-"-O3"}
+  case `(uname -s || echo unknown) 2>/dev/null` in
+  Linux | linux) LDSHARED=${LDSHARED-"gcc -shared -Wl,-soname,libz.so.1"};;
+  *)             LDSHARED=${LDSHARED-"gcc -shared"};;
+  esac
+else
+  # find system name and corresponding cc options
+  CC=${CC-cc}
+  case `(uname -sr || echo unknown) 2>/dev/null` in
+  SunOS\ 5*) SFLAGS=${CFLAGS-"-fast -xcg89 -KPIC -R."}
+             CFLAGS=${CFLAGS-"-fast -xcg89"}
+	     LDSHARED=${LDSHARED-"cc -G"};;
+  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
+	     CFLAGS=${CFLAGS-"-O2"}
+	     LDSHARED=${LDSHARED-"ld"};;
+  IRIX*)     SFLAGS=${CFLAGS-"-ansi -O2 -rpath ."}
+	     CFLAGS=${CFLAGS-"-ansi -O2"}
+	     LDSHARED=${LDSHARED-"cc -shared"};;
+  QNX*)      SFLAGS=${CFLAGS-"-4 -O"}
+             CFLAGS=${CFLAGS-"-4 -O"}
+	     LDSHARED=${LDSHARED-"cc"}
+             RANLIB=${RANLIB-"true"}
+             AR="cc -A";;
+  SCO_SV\ 3.2*) SFLAGS=${CFLAGS-"-O3 -dy -KPIC "}
+	     CFLAGS=${CFLAGS-"-O3"}
+	     LDSHARED=${LDSHARED-"cc -dy -KPIC -G"};;
+  HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
+	     CFLAGS=${CFLAGS-"-O"}
+	     LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
+	     shared_ext='.sl'
+	     SHAREDLIB='libz.sl';;
+  UNIX_System_V\ 4.2.0) 
+	     SFLAGS=${CFLAGS-"-KPIC -O"}
+	     CFLAGS=${CFLAGS-"-O"}
+	     LDSHARED=${LDSHARED-"cc -G"};;
+  # send working options for other systems to support@gzip.org
+  *)         SFLAGS=${CFLAGS-"-O"}
+	     CFLAGS=${CFLAGS-"-O"}
+	     LDSHARED=${LDSHARED-"cc -shared"};;
+  esac
+fi
+
+if test $shared -eq 1; then
+  echo Checking for shared library support...
+  # we must test in two steps (cc then ld), required at least on SunOS 4.x
+  if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&
+     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then
+    CFLAGS="$SFLAGS"
+    LIBS="$SHAREDLIB.$VER"
+    echo Building shared library $SHAREDLIB.$VER with $CC.
+  else
+    echo No shared library suppport.
+    shared=0;
+  fi
+fi
+if test $shared -eq 0; then
+  LDSHARED="$CC"
+  echo Building static library $LIBS version $VER with $CC.
+fi
+rm -f $test.[co] $test$shared_ext
+
+if test -f /usr/include/unistd.h; then
+  CFLAGS="$CFLAGS -DHAVE_UNISTD_H"
+fi
+
+if test ! -f /usr/include/errno.h; then
+  CFLAGS="$CFLAGS -DNO_ERRNO_H"
+fi
+
+# udpate Makefile
+sed < Makefile.in "
+/^CC *=/s,=.*,=$CC,
+/^CFLAGS *=/s/=.*/=$CFLAGS/
+/^LDSHARED *=/s%=.*%=$LDSHARED%
+/^LIBS *=/s,=.*,=$LIBS,
+/^SHAREDLIB *=/s,=.*,=$SHAREDLIB,
+/^AR *=/s,=.*,=$AR,
+/^RANLIB *=/s,=.*,=$RANLIB,
+/^VER *=/s/=.*/=$VER/
+/^prefix *=/s,=.*,=$prefix,
+/^exec_prefix *=/s,=.*,=$exec_prefix,
+" > Makefile

contrib/README.contrib

@@ -0,0 +1,21 @@
+All files under this contrib directory are UNSUPPORTED. There were
+provided by users of zlib and were not tested by the authors of zlib.
+Use at your own risk. Please contact the authors of the contributions
+for help about these, not the zlib authors. Thanks.
+
+
+asm386/     by Gilles Vollant <info@winimage.com>
+	386 asm code replacing longest_match(). This code may be slower
+        than the C code if you have a good compiler.
+
+iostream/   by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+
+iostream2/  by Tyge L<>vset <Tyge.Lovset@cmr.no>
+	Another C++ I/O streams interface
+
+untgz/      by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+	A very simple tar.gz file extractor using zlib
+
+visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.

contrib/asm386/gvmat32.asm

@@ -0,0 +1,464 @@
+;
+; gvmat32.asm -- Asm portion of the optimized longest_match for 32 bits x86
+; Copyright (C) 1995-1996 Jean-loup Gailly and Gilles Vollant.
+; File written by Gilles Vollant, by modifiying the longest_match
+;  from Jean-loup Gailly in deflate.c
+; It need wmask == 0x7fff
+;     (assembly code is faster with a fixed wmask)
+;
+; For Visual C++ 4.2 and ML 6.11c (version in directory \MASM611C of Win95 DDK)
+;   I compile with : "ml /coff /Zi /c gvmat32.asm"
+;
+; uInt longest_match_gvasm(IPos cur_match,int* match_start_ptr,uInt scan_end,
+;                          uInt scan_start,ush* prev,uch* window,int best_len,
+;                          IPos limit,uInt chain_length,uch* scanrp,
+;                          uInt nice_match);
+
+;uInt longest_match(s, cur_match)
+;    deflate_state *s;
+;    IPos cur_match;                             /* current match */
+
+	NbStack		equ	76
+	cur_match	equ	dword ptr[esp+NbStack-0]
+	str_s		equ	dword ptr[esp+NbStack-4]
+	; 5 dword on top (ret,ebp,esi,edi,ebx)
+	adrret		equ	dword ptr[esp+NbStack-8]
+	pushebp		equ	dword ptr[esp+NbStack-12]
+	pushedi		equ	dword ptr[esp+NbStack-16]
+	pushesi		equ	dword ptr[esp+NbStack-20]
+	pushebx		equ	dword ptr[esp+NbStack-24]
+
+	chain_length    equ dword ptr [esp+NbStack-28]
+	limit           equ dword ptr [esp+NbStack-32]
+	best_len        equ dword ptr [esp+NbStack-36]
+	window          equ dword ptr [esp+NbStack-40]
+	prev            equ dword ptr [esp+NbStack-44]
+	scan_start      equ  word ptr [esp+NbStack-48]
+	scan_end        equ  word ptr [esp+NbStack-52]
+	match_start_ptr equ dword ptr [esp+NbStack-56]
+	nice_match      equ dword ptr [esp+NbStack-60]
+	scanrp          equ dword ptr [esp+NbStack-64]
+
+	windowlen       equ dword ptr [esp+NbStack-68]
+	match_start     equ dword ptr [esp+NbStack-72]
+	strend			equ dword ptr [esp+NbStack-76]
+	NbStackAdd		equ	(76-24)
+
+    .386p
+
+    name    gvmatch
+    .MODEL  FLAT
+
+
+@lmtype				TYPEDEF         PROTO C :PTR , :SDWORD
+longest_match_c		PROTO           @lmtype
+
+	dep_max_chain_length	equ	70h
+	dep_window				equ	2ch
+	dep_strstart			equ	60h
+	dep_prev_length			equ 6ch
+	dep_nice_match			equ 84h
+	dep_w_size				equ	20h
+	dep_prev				equ	34h
+	dep_w_mask				equ	28h
+	dep_good_match			equ 80h
+	dep_match_start			equ	64h
+	dep_lookahead			equ	68h
+
+
+_TEXT   segment
+    public  _longest_match_asm7fff
+
+    MAX_MATCH		equ 258
+	MIN_MATCH		equ 3
+	MIN_LOOKAHEAD equ (MAX_MATCH+MIN_MATCH+1)
+
+; initialize or check the variables used in match.asm.
+
+
+; -----------------------------------------------------------------------
+; Set match_start to the longest match starting at the given string and
+; return its length. Matches shorter or equal to prev_length are discarded,
+; in which case the result is equal to prev_length and match_start is
+; garbage.
+; IN assertions: cur_match is the head of the hash chain for the current
+;   string (strstart) and its distance is <= MAX_DIST, and prev_length >= 1
+
+; int longest_match(cur_match)
+
+_longest_match_asm7fff proc near
+
+
+
+	    ; return address
+
+		mov		eax,[esp+4]
+		mov		bx,[eax+dep_w_mask]
+		cmp		bx,7fffh
+		jnz		longest_match_c
+
+	    push    ebp             
+	    push    edi             
+	    push    esi             
+	    push    ebx             
+
+	    sub     esp,NbStackAdd
+
+		;//mov		ebp,str_s
+		mov		ebp,eax
+
+		mov		eax,[ebp+dep_max_chain_length]
+		mov		ebx,[ebp+dep_prev_length]
+		cmp		[ebp+dep_good_match],ebx	; if prev_length>=good_match chain_length >>= 2
+		ja		noshr		
+		shr		eax,2
+noshr:
+		mov		edi,[ebp+dep_nice_match]
+		mov		chain_length,eax
+		mov		edx,[ebp+dep_lookahead]
+		cmp		edx,edi
+;if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+		jae		nolookaheadnicematch
+		mov		edi,edx
+nolookaheadnicematch:
+		mov		best_len,ebx
+
+
+		mov		esi,[ebp+dep_window]
+		mov		ecx,[ebp+dep_strstart]
+		mov		window,esi
+		
+		mov		nice_match,edi
+		add		esi,ecx
+		mov		scanrp,esi
+		mov		ax,word ptr [esi]
+		mov		bx,word ptr [esi+ebx-1]
+		add		esi,MAX_MATCH-1
+		mov		scan_start,ax
+		mov		strend,esi
+		mov		scan_end,bx
+
+;    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+;        s->strstart - (IPos)MAX_DIST(s) : NIL;
+
+		mov		esi,[ebp+dep_w_size]
+		sub		esi,MIN_LOOKAHEAD
+		; here esi = MAX_DIST(s)
+		sub		ecx,esi
+		ja		nodist
+		xor		ecx,ecx
+nodist:
+		mov		limit,ecx
+
+
+
+
+		mov		eax,[ebp+dep_prev]
+		mov		prev,eax
+
+	    mov     ebx,dword ptr [ebp+dep_match_start]
+	    mov     bp,scan_start
+	    mov     edx,cur_match
+	    mov     match_start,ebx
+
+	    mov     bx,scan_end
+	    mov     eax,window
+		mov		edi,eax
+	    add     edi,best_len
+	    mov     esi,prev
+		dec     edi
+	    mov     windowlen,edi
+	    
+	    jmp     beginloop2
+	    align   4
+
+; here, in the loop
+;;;;       eax = chain_length
+;       edx = dx = cur_match
+;       ecx = limit
+;        bx = scan_end
+;        bp = scan_start
+;       edi = windowlen (window + best_len)
+;       esi = prev
+
+
+;// here; eax <=16
+normalbeg0add16: 
+		add		chain_length,16
+		jz		exitloop
+normalbeg0: 
+	    cmp     word ptr[edi+edx-0],bx
+	    je      normalbeg2
+	    and     edx,7fffh
+	    mov     dx,word ptr[esi+edx*2]
+	    cmp     ecx,edx
+	    jnb     exitloop
+	    dec     chain_length
+		jnz		normalbeg0
+;jnbexitloopshort1:
+		jmp     exitloop
+
+contloop3:
+	    mov     edi,windowlen
+
+; cur_match = prev[cur_match & wmask]
+	    and		edx,7fffh
+	    mov     dx,word ptr[esi+edx*2]
+; if cur_match > limit, go to exitloop
+	    cmp     ecx,edx
+jnbexitloopshort1:
+	    jnb     exitloop
+; if --chain_length != 0, go to exitloop
+
+beginloop2:
+		sub		chain_length,16+1
+		jna     normalbeg0add16
+
+do16:
+	    cmp     word ptr[edi+edx],bx
+	    je      normalbeg2dc0
+
+maccn	MACRO	lab
+	    and     edx,7fffh
+	    mov     dx,word ptr[esi+edx*2]
+	    cmp     ecx,edx
+	    jnb     exitloop
+	    cmp     word ptr[edi+edx-0],bx
+	    je      lab
+		ENDM
+
+rcontloop0:
+		maccn normalbeg2dc1
+
+rcontloop1:
+		maccn normalbeg2dc2
+
+rcontloop2:
+		maccn normalbeg2dc3
+
+rcontloop3:
+		maccn normalbeg2dc4
+
+rcontloop4:
+		maccn normalbeg2dc5
+
+rcontloop5:
+		maccn normalbeg2dc6
+
+rcontloop6:
+		maccn normalbeg2dc7
+
+rcontloop7:
+		maccn normalbeg2dc8
+
+rcontloop8:
+		maccn normalbeg2dc9
+
+rcontloop9:
+		maccn normalbeg2dc10
+
+rcontloop10:
+		maccn normalbeg2dc11
+
+rcontloop11:
+		maccn short normalbeg2dc12
+
+rcontloop12:
+		maccn short normalbeg2dc13
+
+rcontloop13:
+		maccn short normalbeg2dc14
+
+rcontloop14:
+		maccn short normalbeg2dc15
+
+rcontloop15:
+	    and     edx,7fffh
+	    mov     dx,word ptr[esi+edx*2]
+	    cmp     ecx,edx
+	    jnb     short exitloopshort
+
+		sub		chain_length,16
+		ja		do16
+		jmp		normalbeg0add16
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+exitloopshort:
+		jmp		exitloop                  
+
+normbeg	MACRO	rcontlab,valsub
+	    cmp     bp,word ptr[eax+edx]
+		jne		rcontlab
+		add     chain_length,16-valsub
+		jmp		iseq
+		ENDM
+
+normalbeg2dc12:
+		normbeg	rcontloop12,12
+
+normalbeg2dc13:
+		normbeg	rcontloop13,13
+
+normalbeg2dc14:
+		normbeg	rcontloop14,14
+
+normalbeg2dc15:
+		normbeg	rcontloop15,15
+
+normalbeg2dc11:
+		normbeg	rcontloop11,11
+
+normalbeg2dc10:
+		normbeg	rcontloop10,10
+
+
+normalbeg2dc9:
+		normbeg	rcontloop9,9
+
+normalbeg2dc8:
+		normbeg	rcontloop8,8
+
+normalbeg2dc7:
+		normbeg	rcontloop7,7
+
+normalbeg2dc5:
+		normbeg	rcontloop5,5
+
+
+
+
+
+normalbeg2dc6:
+		normbeg	rcontloop6,6
+
+normalbeg2dc4:
+		normbeg	rcontloop4,4
+
+normalbeg2dc3:
+		normbeg	rcontloop3,3
+
+normalbeg2dc2:
+		normbeg	rcontloop2,2
+
+normalbeg2dc1:
+		normbeg	rcontloop1,1
+
+normalbeg2dc0:
+		normbeg	rcontloop0,0
+
+
+; we go in normalbeg2 because *(ushf*)(match+best_len-1) == scan_end
+
+normalbeg2:
+
+			 ; 10 nop here take 10% time
+		mov		edi,window
+		  ;mov     chain_length,eax    ; now, we need eax...
+					
+	    cmp     bp,word ptr[edi+edx]
+	    jne     contloop3                   ; if *(ushf*)match != scan_start, continue
+
+iseq:
+
+		mov		edi,eax
+	    mov     esi,scanrp                  ; esi = scan    
+	    add     edi,edx				; edi = window + cur_match = match
+
+		       
+	    mov     eax,[esi+3]					; compare manually dword at match+3
+	    xor     eax,[edi+3]                 ;       and scan +3
+
+	    jz      begincompare                ; if equal, go to long compare
+
+			; we will determine the unmatch byte and calculate len (in esi)
+		or		al,al
+		je		eq1rr
+	    mov     esi,3
+	    jmp     trfinval
+eq1rr:
+	    or      ax,ax                               
+	    je      eq1
+
+	    mov     esi,4
+	    jmp     trfinval
+eq1:
+	    shl     eax,8
+	    jz      eq11
+	    mov     esi,5
+	    jmp     trfinval
+eq11:
+	    mov     esi,6
+	    jmp     trfinval
+
+begincompare:
+		; here we now scan and match begin same
+	    add     edi,6
+	    add     esi,6
+	    mov     ecx,(MAX_MATCH-(2+4))/4     ;//; scan for at most MAX_MATCH bytes
+	    repe    cmpsd                                               ;//; loop until mismatch
+
+	    je      trfin                                               ; go to trfin if not unmatch
+			; we determine the unmatch byte
+	    sub     esi,4
+	    mov     eax,[edi-4]
+	    xor     eax,[esi]
+	    or      al,al
+
+	    jnz     trfin
+	    inc     esi
+
+	    or      ax,ax
+	    jnz     trfin
+	    inc     esi
+
+	    shl     eax,8           
+	    jnz     trfin
+	    inc     esi
+
+trfin:      
+	    sub     esi,scanrp          ; esi = len
+trfinval:
+	    cmp     esi,best_len        ; if len <= best_len, go contloop2
+	    jbe     contloop2
+
+	    mov     best_len,esi        ; len become best_len
+
+	    mov     match_start,edx
+	    cmp     esi,nice_match ;//; if esi >= nice_match, exit
+	    mov     ecx,scanrp
+	    jae     exitloop
+	    add     esi,window
+	    add     ecx,best_len
+			dec             esi
+	    mov     windowlen,esi
+	    mov     bx,[ecx-1]
+
+
+; now we restore eax, ecx and esi, for the big loop :
+contloop2:
+	    mov     esi,prev
+	    mov     ecx,limit
+	    ;mov     eax,chain_length
+		mov		eax,window
+	    jmp     contloop3
+
+exitloop:        
+	    mov     ebx,match_start
+		mov		ebp,str_s
+	    mov     dword ptr [ebp+dep_match_start],ebx
+	    mov     eax,best_len
+	    add     esp,NbStackAdd
+
+
+	    pop     ebx
+	    pop     esi
+	    pop     edi
+	    pop     ebp 
+	    ret
+
+_longest_match_asm7fff endp
+
+_TEXT   ends
+end
+					

contrib/asm386/gvmat32c.c

@@ -0,0 +1,229 @@
+/* gvmat32.c -- C portion of the optimized longest_match for 32 bits x86
+ * Copyright (C) 1995-1996 Jean-loup Gailly and Gilles Vollant.
+ * File written by Gilles Vollant, by modifiying the longest_match
+ *  from Jean-loup Gailly in deflate.c
+ *  it prepare all parameters and call the assembly longest_match_gvasm
+ *  longest_match execute standard C code is wmask != 0x7fff
+ *     (assembly code is faster with a fixed wmask)
+ *
+ */
+//#pragma optimize("agt",on)
+
+#include "deflate.h"
+
+#undef FAR
+#include <windows.h>
+
+#ifdef ASMV
+
+#define NIL 0
+
+static unsigned int tot=0;
+static unsigned int totl0=0;
+static unsigned int totl0p0=0;
+static unsigned int ba0=0;
+static unsigned int ba1=0;
+static unsigned int cpta=0;
+static unsigned int cptb=0;
+
+#define UNALIGNED_OK
+#define gvshow(a,b,c,d)
+/*
+void gvshow(int chain_length,int len,int limit,ushf* prev)
+{
+static int ival=0;
+char sz[80];
+unsigned long i;
+int prev0=*prev;
+	ival++;
+	//wsprintf(sz,"call %u, len=%u, chain_length=%u\n",ival,len,chain_length);
+	//OutputDebugString(sz);
+	tot++;
+	if (limit==NIL)
+		totl0++;
+	if ((limit==NIL) && (prev0==0))
+		totl0p0++;
+	for (i=limit+1;i<32768;i++)
+	{
+		ush va=*(prev+i);
+		if (ba0>4000000000)
+		{
+			ba0+=10;
+		}
+		ba0++;
+		if ((va>limit) || (va==0))
+			continue;
+		ba1++;
+	}
+}
+*/
+
+
+/* if your C compiler don't add underline before function name,
+		define ADD_UNDERLINE_ASMFUNC */
+#ifdef ADD_UNDERLINE_ASMFUNC
+#define longest_match_asm7fff _longest_match_asm7fff
+#endif
+void match_init()
+{
+}
+
+uInt longest_match_c(
+    deflate_state *s,
+    IPos cur_match);                             /* current match */
+
+
+uInt longest_match_asm7fff(
+    deflate_state *s,
+    IPos cur_match);                             /* current match */
+
+uInt longest_match(
+    deflate_state *s,
+    IPos cur_match)                             /* current match */
+{
+    if (s->w_mask == 0x7fff)
+        return longest_match_asm7fff(s,cur_match);
+    return longest_match_c(s,cur_match);
+}
+
+
+
+uInt longest_match_c(s, cur_match)
+    deflate_state *s;
+    IPos cur_match;                             /* current match */
+{
+    unsigned chain_length = s->max_chain_length;/* max hash chain length */
+    register Bytef *scan = s->window + s->strstart; /* current string */
+    register Bytef *match;                       /* matched string */
+    register int len;                           /* length of current match */
+    int best_len = s->prev_length;              /* best match length so far */
+    int nice_match = s->nice_match;             /* stop if match long enough */
+    IPos limit = s->strstart > (IPos)MAX_DIST(s) ?
+        s->strstart - (IPos)MAX_DIST(s) : NIL;
+    /* Stop when cur_match becomes <= limit. To simplify the code,
+     * we prevent matches with the string of window index 0.
+     */
+    Posf *prev = s->prev;
+    uInt wmask = s->w_mask;
+
+#ifdef UNALIGNED_OK
+    /* Compare two bytes at a time. Note: this is not always beneficial.
+     * Try with and without -DUNALIGNED_OK to check.
+     */
+    register Bytef *strend = s->window + s->strstart + MAX_MATCH - 1;
+    register ush scan_start = *(ushf*)scan;
+    register ush scan_end   = *(ushf*)(scan+best_len-1);
+#else
+    register Bytef *strend = s->window + s->strstart + MAX_MATCH;
+    register Byte scan_end1  = scan[best_len-1];
+    register Byte scan_end   = scan[best_len];
+#endif
+
+    /* The code is optimized for HASH_BITS >= 8 and MAX_MATCH-2 multiple of 16.
+     * It is easy to get rid of this optimization if necessary.
+     */
+    Assert(s->hash_bits >= 8 && MAX_MATCH == 258, "Code too clever");
+
+    /* Do not waste too much time if we already have a good match: */
+    if (s->prev_length >= s->good_match) {
+        chain_length >>= 2;
+    }
+    /* Do not look for matches beyond the end of the input. This is necessary
+     * to make deflate deterministic.
+     */
+    if ((uInt)nice_match > s->lookahead) nice_match = s->lookahead;
+
+    Assert((ulg)s->strstart <= s->window_size-MIN_LOOKAHEAD, "need lookahead");
+
+    do {
+        Assert(cur_match < s->strstart, "no future");
+        match = s->window + cur_match;
+
+        /* Skip to next match if the match length cannot increase
+         * or if the match length is less than 2:
+         */
+#if (defined(UNALIGNED_OK) && MAX_MATCH == 258)
+        /* This code assumes sizeof(unsigned short) == 2. Do not use
+         * UNALIGNED_OK if your compiler uses a different size.
+         */
+        if (*(ushf*)(match+best_len-1) != scan_end ||
+            *(ushf*)match != scan_start) continue;
+
+        /* It is not necessary to compare scan[2] and match[2] since they are
+         * always equal when the other bytes match, given that the hash keys
+         * are equal and that HASH_BITS >= 8. Compare 2 bytes at a time at
+         * strstart+3, +5, ... up to strstart+257. We check for insufficient
+         * lookahead only every 4th comparison; the 128th check will be made
+         * at strstart+257. If MAX_MATCH-2 is not a multiple of 8, it is
+         * necessary to put more guard bytes at the end of the window, or
+         * to check more often for insufficient lookahead.
+         */
+        Assert(scan[2] == match[2], "scan[2]?");
+        scan++, match++;
+        do {
+        } while (*(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 *(ushf*)(scan+=2) == *(ushf*)(match+=2) &&
+                 scan < strend);
+        /* The funny "do {}" generates better code on most compilers */
+
+        /* Here, scan <= window+strstart+257 */
+        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+        if (*scan == *match) scan++;
+
+        len = (MAX_MATCH - 1) - (int)(strend-scan);
+        scan = strend - (MAX_MATCH-1);
+
+#else /* UNALIGNED_OK */
+
+        if (match[best_len]   != scan_end  ||
+            match[best_len-1] != scan_end1 ||
+            *match            != *scan     ||
+            *++match          != scan[1])      continue;
+
+        /* The check at best_len-1 can be removed because it will be made
+         * again later. (This heuristic is not always a win.)
+         * It is not necessary to compare scan[2] and match[2] since they
+         * are always equal when the other bytes match, given that
+         * the hash keys are equal and that HASH_BITS >= 8.
+         */
+        scan += 2, match++;
+        Assert(*scan == *match, "match[2]?");
+
+        /* We check for insufficient lookahead only every 8th comparison;
+         * the 256th check will be made at strstart+258.
+         */
+        do {
+        } while (*++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 *++scan == *++match && *++scan == *++match &&
+                 scan < strend);
+
+        Assert(scan <= s->window+(unsigned)(s->window_size-1), "wild scan");
+
+        len = MAX_MATCH - (int)(strend - scan);
+        scan = strend - MAX_MATCH;
+
+#endif /* UNALIGNED_OK */
+
+        if (len > best_len) {
+            s->match_start = cur_match;
+            best_len = len;
+            if (len >= nice_match) break;
+#ifdef UNALIGNED_OK
+            scan_end = *(ushf*)(scan+best_len-1);
+#else
+            scan_end1  = scan[best_len-1];
+            scan_end   = scan[best_len];
+#endif
+        }
+    } while ((cur_match = prev[cur_match & wmask]) > limit
+             && --chain_length != 0);
+
+    if ((uInt)best_len <= s->lookahead) return best_len;
+    return s->lookahead;
+}
+
+#endif /* ASMV */

contrib/asm386/mkgvmt32.bat

@@ -0,0 +1 @@
+c:\masm611\bin\ml /coff /Zi /c /Flgvmat32.lst gvmat32.asm

contrib/asm386/zlibvc.mak

@@ -0,0 +1,781 @@
+# Microsoft Developer Studio Generated NMAKE File, Format Version 4.20
+# ** DO NOT EDIT **
+
+# TARGTYPE "Win32 (x86) Dynamic-Link Library" 0x0102
+
+!IF "$(CFG)" == ""
+CFG=zlibvc - Win32 Debug
+!MESSAGE No configuration specified.  Defaulting to zlibvc - Win32 Debug.
+!ENDIF 
+
+!IF "$(CFG)" != "zlibvc - Win32 Release" && "$(CFG)" != "zlibvc - Win32 Debug"
+!MESSAGE Invalid configuration "$(CFG)" specified.
+!MESSAGE You can specify a configuration when running NMAKE on this makefile
+!MESSAGE by defining the macro CFG on the command line.  For example:
+!MESSAGE 
+!MESSAGE NMAKE /f "zlibvc.mak" CFG="zlibvc - Win32 Debug"
+!MESSAGE 
+!MESSAGE Possible choices for configuration are:
+!MESSAGE 
+!MESSAGE "zlibvc - Win32 Release" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE "zlibvc - Win32 Debug" (based on "Win32 (x86) Dynamic-Link Library")
+!MESSAGE 
+!ERROR An invalid configuration is specified.
+!ENDIF 
+
+!IF "$(OS)" == "Windows_NT"
+NULL=
+!ELSE 
+NULL=nul
+!ENDIF 
+################################################################################
+# Begin Project
+# PROP Target_Last_Scanned "zlibvc - Win32 Debug"
+CPP=cl.exe
+RSC=rc.exe
+MTL=mktyplib.exe
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 0
+# PROP BASE Output_Dir "Release"
+# PROP BASE Intermediate_Dir "Release"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 0
+# PROP Output_Dir "Release"
+# PROP Intermediate_Dir "Release"
+# PROP Target_Dir ""
+OUTDIR=.\Release
+INTDIR=.\Release
+
+ALL : "$(OUTDIR)\zlib.dll" "$(OUTDIR)\zlibvc.bsc"
+
+CLEAN : 
+	-@erase "$(INTDIR)\adler32.obj"
+	-@erase "$(INTDIR)\adler32.sbr"
+	-@erase "$(INTDIR)\compress.obj"
+	-@erase "$(INTDIR)\compress.sbr"
+	-@erase "$(INTDIR)\crc32.obj"
+	-@erase "$(INTDIR)\crc32.sbr"
+	-@erase "$(INTDIR)\deflate.obj"
+	-@erase "$(INTDIR)\deflate.sbr"
+	-@erase "$(INTDIR)\gvmat32c.obj"
+	-@erase "$(INTDIR)\gvmat32c.sbr"
+	-@erase "$(INTDIR)\gzio.obj"
+	-@erase "$(INTDIR)\gzio.sbr"
+	-@erase "$(INTDIR)\infblock.obj"
+	-@erase "$(INTDIR)\infblock.sbr"
+	-@erase "$(INTDIR)\infcodes.obj"
+	-@erase "$(INTDIR)\infcodes.sbr"
+	-@erase "$(INTDIR)\inffast.obj"
+	-@erase "$(INTDIR)\inffast.sbr"
+	-@erase "$(INTDIR)\inflate.obj"
+	-@erase "$(INTDIR)\inflate.sbr"
+	-@erase "$(INTDIR)\inftrees.obj"
+	-@erase "$(INTDIR)\inftrees.sbr"
+	-@erase "$(INTDIR)\infutil.obj"
+	-@erase "$(INTDIR)\infutil.sbr"
+	-@erase "$(INTDIR)\trees.obj"
+	-@erase "$(INTDIR)\trees.sbr"
+	-@erase "$(INTDIR)\uncompr.obj"
+	-@erase "$(INTDIR)\uncompr.sbr"
+	-@erase "$(INTDIR)\zlib.res"
+	-@erase "$(INTDIR)\zutil.obj"
+	-@erase "$(INTDIR)\zutil.sbr"
+	-@erase "$(OUTDIR)\zlib.dll"
+	-@erase "$(OUTDIR)\zlib.exp"
+	-@erase "$(OUTDIR)\zlib.lib"
+	-@erase "$(OUTDIR)\zlib.map"
+	-@erase "$(OUTDIR)\zlibvc.bsc"
+
+"$(OUTDIR)" :
+    if not exist "$(OUTDIR)/$(NULL)" mkdir "$(OUTDIR)"
+
+# ADD BASE CPP /nologo /MT /W3 /GX /O2 /D "WIN32" /D "NDEBUG" /D "_WINDOWS" /YX /c
+# ADD CPP /nologo /MT /W3 /GX /O2 /D "NDEBUG" /D fdopen=_fdopen /D "WIN32" /D "_WINDOWS" /D "_WINDLL" /D "_WIN32" /D "BUILD_ZLIBDLL" /D "ZLIB_DLL" /D "ASMV" /FR /YX /c
+CPP_PROJ=/nologo /MT /W3 /GX /O2 /D "NDEBUG" /D fdopen=_fdopen /D "WIN32" /D\
+ "_WINDOWS" /D "_WINDLL" /D "_WIN32" /D "BUILD_ZLIBDLL" /D "ZLIB_DLL" /D "ASMV"\
+ /FR"$(INTDIR)/" /Fp"$(INTDIR)/zlibvc.pch" /YX /Fo"$(INTDIR)/" /c 
+CPP_OBJS=.\Release/
+CPP_SBRS=.\Release/
+# ADD BASE MTL /nologo /D "NDEBUG" /win32
+# ADD MTL /nologo /D "NDEBUG" /win32
+MTL_PROJ=/nologo /D "NDEBUG" /win32 
+# ADD BASE RSC /l 0x40c /d "NDEBUG"
+# ADD RSC /l 0x40c /d "NDEBUG"
+RSC_PROJ=/l 0x40c /fo"$(INTDIR)/zlib.res" /d "NDEBUG" 
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+BSC32_FLAGS=/nologo /o"$(OUTDIR)/zlibvc.bsc" 
+BSC32_SBRS= \
+	"$(INTDIR)\adler32.sbr" \
+	"$(INTDIR)\compress.sbr" \
+	"$(INTDIR)\crc32.sbr" \
+	"$(INTDIR)\deflate.sbr" \
+	"$(INTDIR)\gvmat32c.sbr" \
+	"$(INTDIR)\gzio.sbr" \
+	"$(INTDIR)\infblock.sbr" \
+	"$(INTDIR)\infcodes.sbr" \
+	"$(INTDIR)\inffast.sbr" \
+	"$(INTDIR)\inflate.sbr" \
+	"$(INTDIR)\inftrees.sbr" \
+	"$(INTDIR)\infutil.sbr" \
+	"$(INTDIR)\trees.sbr" \
+	"$(INTDIR)\uncompr.sbr" \
+	"$(INTDIR)\zutil.sbr"
+
+"$(OUTDIR)\zlibvc.bsc" : "$(OUTDIR)" $(BSC32_SBRS)
+    $(BSC32) @<<
+  $(BSC32_FLAGS) $(BSC32_SBRS)
+<<
+
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /machine:I386
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib crtdll.lib /nologo /subsystem:windows /dll /map /machine:I386 /nodefaultlib /out:"Release/zlib.dll"
+LINK32_FLAGS=kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib\
+ advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib crtdll.lib /nologo\
+ /subsystem:windows /dll /incremental:no /pdb:"$(OUTDIR)/zlib.pdb"\
+ /map:"$(INTDIR)/zlib.map" /machine:I386 /nodefaultlib /def:".\zlib.def"\
+ /out:"$(OUTDIR)/zlib.dll" /implib:"$(OUTDIR)/zlib.lib" 
+DEF_FILE= \
+	".\zlib.def"
+LINK32_OBJS= \
+	"$(INTDIR)\adler32.obj" \
+	"$(INTDIR)\compress.obj" \
+	"$(INTDIR)\crc32.obj" \
+	"$(INTDIR)\deflate.obj" \
+	"$(INTDIR)\gvmat32c.obj" \
+	"$(INTDIR)\gzio.obj" \
+	"$(INTDIR)\infblock.obj" \
+	"$(INTDIR)\infcodes.obj" \
+	"$(INTDIR)\inffast.obj" \
+	"$(INTDIR)\inflate.obj" \
+	"$(INTDIR)\inftrees.obj" \
+	"$(INTDIR)\infutil.obj" \
+	"$(INTDIR)\trees.obj" \
+	"$(INTDIR)\uncompr.obj" \
+	"$(INTDIR)\zlib.res" \
+	"$(INTDIR)\zutil.obj" \
+	".\GVMAT32.obj"
+
+"$(OUTDIR)\zlib.dll" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
+    $(LINK32) @<<
+  $(LINK32_FLAGS) $(LINK32_OBJS)
+<<
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+# PROP BASE Use_MFC 0
+# PROP BASE Use_Debug_Libraries 1
+# PROP BASE Output_Dir "Debug"
+# PROP BASE Intermediate_Dir "Debug"
+# PROP BASE Target_Dir ""
+# PROP Use_MFC 0
+# PROP Use_Debug_Libraries 1
+# PROP Output_Dir "Debug"
+# PROP Intermediate_Dir "Debug"
+# PROP Target_Dir ""
+OUTDIR=.\Debug
+INTDIR=.\Debug
+
+ALL : "$(OUTDIR)\zlib.dll"
+
+CLEAN : 
+	-@erase "$(INTDIR)\adler32.obj"
+	-@erase "$(INTDIR)\compress.obj"
+	-@erase "$(INTDIR)\crc32.obj"
+	-@erase "$(INTDIR)\deflate.obj"
+	-@erase "$(INTDIR)\gvmat32c.obj"
+	-@erase "$(INTDIR)\gzio.obj"
+	-@erase "$(INTDIR)\infblock.obj"
+	-@erase "$(INTDIR)\infcodes.obj"
+	-@erase "$(INTDIR)\inffast.obj"
+	-@erase "$(INTDIR)\inflate.obj"
+	-@erase "$(INTDIR)\inftrees.obj"
+	-@erase "$(INTDIR)\infutil.obj"
+	-@erase "$(INTDIR)\trees.obj"
+	-@erase "$(INTDIR)\uncompr.obj"
+	-@erase "$(INTDIR)\vc40.idb"
+	-@erase "$(INTDIR)\vc40.pdb"
+	-@erase "$(INTDIR)\zlib.res"
+	-@erase "$(INTDIR)\zutil.obj"
+	-@erase "$(OUTDIR)\zlib.dll"
+	-@erase "$(OUTDIR)\zlib.exp"
+	-@erase "$(OUTDIR)\zlib.ilk"
+	-@erase "$(OUTDIR)\zlib.lib"
+	-@erase "$(OUTDIR)\zlib.pdb"
+
+"$(OUTDIR)" :
+    if not exist "$(OUTDIR)/$(NULL)" mkdir "$(OUTDIR)"
+
+# ADD BASE CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "WIN32" /D "_DEBUG" /D "_WINDOWS" /YX /c
+# ADD CPP /nologo /MTd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS" /D "_WINDLL" /D "_WIN32" /D "BUILD_ZLIBDLL" /D "ZLIB_DLL" /YX /c
+CPP_PROJ=/nologo /MTd /W3 /Gm /GX /Zi /Od /D "_DEBUG" /D "WIN32" /D "_WINDOWS"\
+ /D "_WINDLL" /D "_WIN32" /D "BUILD_ZLIBDLL" /D "ZLIB_DLL"\
+ /Fp"$(INTDIR)/zlibvc.pch" /YX /Fo"$(INTDIR)/" /Fd"$(INTDIR)/" /c 
+CPP_OBJS=.\Debug/
+CPP_SBRS=.\.
+# ADD BASE MTL /nologo /D "_DEBUG" /win32
+# ADD MTL /nologo /D "_DEBUG" /win32
+MTL_PROJ=/nologo /D "_DEBUG" /win32 
+# ADD BASE RSC /l 0x40c /d "_DEBUG"
+# ADD RSC /l 0x40c /d "_DEBUG"
+RSC_PROJ=/l 0x40c /fo"$(INTDIR)/zlib.res" /d "_DEBUG" 
+BSC32=bscmake.exe
+# ADD BASE BSC32 /nologo
+# ADD BSC32 /nologo
+BSC32_FLAGS=/nologo /o"$(OUTDIR)/zlibvc.bsc" 
+BSC32_SBRS= \
+	
+LINK32=link.exe
+# ADD BASE LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib odbc32.lib odbccp32.lib /nologo /subsystem:windows /dll /debug /machine:I386
+# ADD LINK32 kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib /nologo /subsystem:windows /dll /debug /machine:I386 /out:"Debug/zlib.dll"
+LINK32_FLAGS=kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib\
+ advapi32.lib shell32.lib ole32.lib oleaut32.lib uuid.lib /nologo\
+ /subsystem:windows /dll /incremental:yes /pdb:"$(OUTDIR)/zlib.pdb" /debug\
+ /machine:I386 /def:".\zlib.def" /out:"$(OUTDIR)/zlib.dll"\
+ /implib:"$(OUTDIR)/zlib.lib" 
+DEF_FILE= \
+	".\zlib.def"
+LINK32_OBJS= \
+	"$(INTDIR)\adler32.obj" \
+	"$(INTDIR)\compress.obj" \
+	"$(INTDIR)\crc32.obj" \
+	"$(INTDIR)\deflate.obj" \
+	"$(INTDIR)\gvmat32c.obj" \
+	"$(INTDIR)\gzio.obj" \
+	"$(INTDIR)\infblock.obj" \
+	"$(INTDIR)\infcodes.obj" \
+	"$(INTDIR)\inffast.obj" \
+	"$(INTDIR)\inflate.obj" \
+	"$(INTDIR)\inftrees.obj" \
+	"$(INTDIR)\infutil.obj" \
+	"$(INTDIR)\trees.obj" \
+	"$(INTDIR)\uncompr.obj" \
+	"$(INTDIR)\zlib.res" \
+	"$(INTDIR)\zutil.obj" \
+	".\GVMAT32.obj"
+
+"$(OUTDIR)\zlib.dll" : "$(OUTDIR)" $(DEF_FILE) $(LINK32_OBJS)
+    $(LINK32) @<<
+  $(LINK32_FLAGS) $(LINK32_OBJS)
+<<
+
+!ENDIF 
+
+.c{$(CPP_OBJS)}.obj:
+   $(CPP) $(CPP_PROJ) $<  
+
+.cpp{$(CPP_OBJS)}.obj:
+   $(CPP) $(CPP_PROJ) $<  
+
+.cxx{$(CPP_OBJS)}.obj:
+   $(CPP) $(CPP_PROJ) $<  
+
+.c{$(CPP_SBRS)}.sbr:
+   $(CPP) $(CPP_PROJ) $<  
+
+.cpp{$(CPP_SBRS)}.sbr:
+   $(CPP) $(CPP_PROJ) $<  
+
+.cxx{$(CPP_SBRS)}.sbr:
+   $(CPP) $(CPP_PROJ) $<  
+
+################################################################################
+# Begin Target
+
+# Name "zlibvc - Win32 Release"
+# Name "zlibvc - Win32 Debug"
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+!ENDIF 
+
+################################################################################
+# Begin Source File
+
+SOURCE=.\adler32.c
+DEP_CPP_ADLER=\
+	".\zconf.h"\
+	".\zlib.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\adler32.obj" : $(SOURCE) $(DEP_CPP_ADLER) "$(INTDIR)"
+
+"$(INTDIR)\adler32.sbr" : $(SOURCE) $(DEP_CPP_ADLER) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\adler32.obj" : $(SOURCE) $(DEP_CPP_ADLER) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\compress.c
+DEP_CPP_COMPR=\
+	".\zconf.h"\
+	".\zlib.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\compress.obj" : $(SOURCE) $(DEP_CPP_COMPR) "$(INTDIR)"
+
+"$(INTDIR)\compress.sbr" : $(SOURCE) $(DEP_CPP_COMPR) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\compress.obj" : $(SOURCE) $(DEP_CPP_COMPR) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\crc32.c
+DEP_CPP_CRC32=\
+	".\zconf.h"\
+	".\zlib.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\crc32.obj" : $(SOURCE) $(DEP_CPP_CRC32) "$(INTDIR)"
+
+"$(INTDIR)\crc32.sbr" : $(SOURCE) $(DEP_CPP_CRC32) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\crc32.obj" : $(SOURCE) $(DEP_CPP_CRC32) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\deflate.c
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+DEP_CPP_DEFLA=\
+	".\deflate.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+"$(INTDIR)\deflate.obj" : $(SOURCE) $(DEP_CPP_DEFLA) "$(INTDIR)"
+
+"$(INTDIR)\deflate.sbr" : $(SOURCE) $(DEP_CPP_DEFLA) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+DEP_CPP_DEFLA=\
+	".\deflate.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+NODEP_CPP_DEFLA=\
+	".\local"\
+	
+
+"$(INTDIR)\deflate.obj" : $(SOURCE) $(DEP_CPP_DEFLA) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\gzio.c
+DEP_CPP_GZIO_=\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\gzio.obj" : $(SOURCE) $(DEP_CPP_GZIO_) "$(INTDIR)"
+
+"$(INTDIR)\gzio.sbr" : $(SOURCE) $(DEP_CPP_GZIO_) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\gzio.obj" : $(SOURCE) $(DEP_CPP_GZIO_) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\infblock.c
+DEP_CPP_INFBL=\
+	".\infblock.h"\
+	".\infcodes.h"\
+	".\inftrees.h"\
+	".\infutil.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\infblock.obj" : $(SOURCE) $(DEP_CPP_INFBL) "$(INTDIR)"
+
+"$(INTDIR)\infblock.sbr" : $(SOURCE) $(DEP_CPP_INFBL) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\infblock.obj" : $(SOURCE) $(DEP_CPP_INFBL) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\infcodes.c
+DEP_CPP_INFCO=\
+	".\infblock.h"\
+	".\infcodes.h"\
+	".\inffast.h"\
+	".\inftrees.h"\
+	".\infutil.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\infcodes.obj" : $(SOURCE) $(DEP_CPP_INFCO) "$(INTDIR)"
+
+"$(INTDIR)\infcodes.sbr" : $(SOURCE) $(DEP_CPP_INFCO) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\infcodes.obj" : $(SOURCE) $(DEP_CPP_INFCO) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\inffast.c
+DEP_CPP_INFFA=\
+	".\infblock.h"\
+	".\infcodes.h"\
+	".\inffast.h"\
+	".\inftrees.h"\
+	".\infutil.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\inffast.obj" : $(SOURCE) $(DEP_CPP_INFFA) "$(INTDIR)"
+
+"$(INTDIR)\inffast.sbr" : $(SOURCE) $(DEP_CPP_INFFA) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\inffast.obj" : $(SOURCE) $(DEP_CPP_INFFA) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\inflate.c
+DEP_CPP_INFLA=\
+	".\infblock.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\inflate.obj" : $(SOURCE) $(DEP_CPP_INFLA) "$(INTDIR)"
+
+"$(INTDIR)\inflate.sbr" : $(SOURCE) $(DEP_CPP_INFLA) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\inflate.obj" : $(SOURCE) $(DEP_CPP_INFLA) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\inftrees.c
+DEP_CPP_INFTR=\
+	".\inftrees.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\inftrees.obj" : $(SOURCE) $(DEP_CPP_INFTR) "$(INTDIR)"
+
+"$(INTDIR)\inftrees.sbr" : $(SOURCE) $(DEP_CPP_INFTR) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\inftrees.obj" : $(SOURCE) $(DEP_CPP_INFTR) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\infutil.c
+DEP_CPP_INFUT=\
+	".\infblock.h"\
+	".\infcodes.h"\
+	".\inftrees.h"\
+	".\infutil.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\infutil.obj" : $(SOURCE) $(DEP_CPP_INFUT) "$(INTDIR)"
+
+"$(INTDIR)\infutil.sbr" : $(SOURCE) $(DEP_CPP_INFUT) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\infutil.obj" : $(SOURCE) $(DEP_CPP_INFUT) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\trees.c
+DEP_CPP_TREES=\
+	".\deflate.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\trees.obj" : $(SOURCE) $(DEP_CPP_TREES) "$(INTDIR)"
+
+"$(INTDIR)\trees.sbr" : $(SOURCE) $(DEP_CPP_TREES) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\trees.obj" : $(SOURCE) $(DEP_CPP_TREES) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\uncompr.c
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+DEP_CPP_UNCOM=\
+	".\zconf.h"\
+	".\zlib.h"\
+	
+
+"$(INTDIR)\uncompr.obj" : $(SOURCE) $(DEP_CPP_UNCOM) "$(INTDIR)"
+
+"$(INTDIR)\uncompr.sbr" : $(SOURCE) $(DEP_CPP_UNCOM) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+DEP_CPP_UNCOM=\
+	".\zconf.h"\
+	".\zlib.h"\
+	
+NODEP_CPP_UNCOM=\
+	".\uncompress"\
+	
+
+"$(INTDIR)\uncompr.obj" : $(SOURCE) $(DEP_CPP_UNCOM) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\zutil.c
+DEP_CPP_ZUTIL=\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+
+"$(INTDIR)\zutil.obj" : $(SOURCE) $(DEP_CPP_ZUTIL) "$(INTDIR)"
+
+"$(INTDIR)\zutil.sbr" : $(SOURCE) $(DEP_CPP_ZUTIL) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+
+"$(INTDIR)\zutil.obj" : $(SOURCE) $(DEP_CPP_ZUTIL) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\zlib.rc
+
+"$(INTDIR)\zlib.res" : $(SOURCE) "$(INTDIR)"
+   $(RSC) $(RSC_PROJ) $(SOURCE)
+
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\zlib.def
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\GVMAT32.obj
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+!ENDIF 
+
+# End Source File
+################################################################################
+# Begin Source File
+
+SOURCE=.\gvmat32c.c
+
+!IF  "$(CFG)" == "zlibvc - Win32 Release"
+
+DEP_CPP_GVMAT=\
+	".\deflate.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+"$(INTDIR)\gvmat32c.obj" : $(SOURCE) $(DEP_CPP_GVMAT) "$(INTDIR)"
+
+"$(INTDIR)\gvmat32c.sbr" : $(SOURCE) $(DEP_CPP_GVMAT) "$(INTDIR)"
+
+
+!ELSEIF  "$(CFG)" == "zlibvc - Win32 Debug"
+
+DEP_CPP_GVMAT=\
+	".\deflate.h"\
+	".\zconf.h"\
+	".\zlib.h"\
+	".\zutil.h"\
+	
+
+"$(INTDIR)\gvmat32c.obj" : $(SOURCE) $(DEP_CPP_GVMAT) "$(INTDIR)"
+
+
+!ENDIF 
+
+# End Source File
+# End Target
+# End Project
+################################################################################

contrib/iostream/test.cpp

@@ -0,0 +1,24 @@
+
+#include "zfstream.h"
+
+int main() {
+
+  // Construct a stream object with this filebuffer.  Anything sent
+  // to this stream will go to standard out.
+  gzofstream os( 1, ios::out );
+
+  // This text is getting compressed and sent to stdout.
+  // To prove this, run 'test | zcat'.
+  os << "Hello, Mommy" << endl;
+
+  os << setcompressionlevel( Z_NO_COMPRESSION );
+  os << "hello, hello, hi, ho!" << endl;
+
+  setcompressionlevel( os, Z_DEFAULT_COMPRESSION )
+    << "I'm compressing again" << endl;
+
+  os.close();
+
+  return 0;
+
+}

contrib/iostream/zfstream.cpp

@@ -0,0 +1,329 @@
+
+#include <memory.h>
+#include "zfstream.h"
+
+gzfilebuf::gzfilebuf() :
+  file(NULL),
+  mode(0),
+  own_file_descriptor(0)
+{ }
+
+gzfilebuf::~gzfilebuf() {
+
+  sync();
+  if ( own_file_descriptor )
+    close();
+
+}
+
+gzfilebuf *gzfilebuf::open( const char *name,
+			    int io_mode ) {
+
+  if ( is_open() )
+    return NULL;
+
+  char char_mode[10];
+  char *p;
+  memset(char_mode,'\0',10);
+  p = char_mode;
+
+  if ( io_mode & ios::in ) {
+    mode = ios::in;
+    *p++ = 'r';
+  } else if ( io_mode & ios::app ) {
+    mode = ios::app;
+    *p++ = 'a';
+  } else {
+    mode = ios::out;
+    *p++ = 'w';
+  }
+
+  if ( io_mode & ios::binary ) {
+    mode |= ios::binary;
+    *p++ = 'b';
+  }
+
+  // Hard code the compression level
+  if ( io_mode & (ios::out|ios::app )) {
+    *p++ = '9';
+  }
+
+  if ( (file = gzopen(name, char_mode)) == NULL )
+    return NULL;
+
+  own_file_descriptor = 1;
+
+  return this;
+
+}
+
+gzfilebuf *gzfilebuf::attach( int file_descriptor,
+			      int io_mode ) {
+
+  if ( is_open() )
+    return NULL;
+
+  char char_mode[10];
+  char *p;
+  memset(char_mode,'\0',10);
+  p = char_mode;
+
+  if ( io_mode & ios::in ) {
+    mode = ios::in;
+    *p++ = 'r';
+  } else if ( io_mode & ios::app ) {
+    mode = ios::app;
+    *p++ = 'a';
+  } else {
+    mode = ios::out;
+    *p++ = 'w';
+  }
+
+  if ( io_mode & ios::binary ) {
+    mode |= ios::binary;
+    *p++ = 'b';
+  }
+
+  // Hard code the compression level
+  if ( io_mode & (ios::out|ios::app )) {
+    *p++ = '9';
+  }
+
+  if ( (file = gzdopen(file_descriptor, char_mode)) == NULL )
+    return NULL;
+
+  own_file_descriptor = 0;
+
+  return this;
+
+}
+
+gzfilebuf *gzfilebuf::close() {
+
+  if ( is_open() ) {
+
+    sync();
+    gzclose( file );
+    file = NULL;
+
+  }
+
+  return this;
+
+}
+
+int gzfilebuf::setcompressionlevel( short comp_level ) {
+
+  return gzsetparams(file, comp_level, -2);
+
+}
+
+int gzfilebuf::setcompressionstrategy( short comp_strategy ) {
+
+  return gzsetparams(file, -2, comp_strategy);
+
+}
+
+
+streampos gzfilebuf::seekoff( streamoff off, ios::seek_dir dir, int which ) {
+
+  return streampos(EOF);
+
+}
+
+int gzfilebuf::underflow() {
+
+  // If the file hasn't been opened for reading, error.
+  if ( !is_open() || !(mode & ios::in) )
+    return EOF;
+
+  // if a buffer doesn't exists, allocate one.
+  if ( !base() ) {
+
+    if ( (allocate()) == EOF )
+      return EOF;
+    setp(0,0);
+
+  } else {
+
+    if ( in_avail() )
+      return (unsigned char) *gptr();
+
+    if ( out_waiting() ) {
+      if ( flushbuf() == EOF )
+	return EOF;
+    }
+
+  }
+
+  // Attempt to fill the buffer.
+
+  int result = fillbuf();
+  if ( result == EOF ) {
+    // disable get area
+    setg(0,0,0);
+    return EOF;
+  }
+
+  return (unsigned char) *gptr();
+
+}
+
+int gzfilebuf::overflow( int c ) {
+
+  if ( !is_open() || !(mode & ios::out) )
+    return EOF;
+
+  if ( !base() ) {
+    if ( allocate() == EOF )
+      return EOF;
+    setg(0,0,0);
+  } else {
+    if (in_avail()) {
+	return EOF;
+    }
+    if (out_waiting()) {
+      if (flushbuf() == EOF)
+	return EOF;
+    }
+  }
+
+  int bl = blen();
+  setp( base(), base() + bl);
+
+  if ( c != EOF ) {
+
+    *pptr() = c;
+    pbump(1);
+
+  }
+
+  return 0;
+
+}
+
+int gzfilebuf::sync() {
+
+  if ( !is_open() )
+    return EOF;
+
+  if ( out_waiting() )
+    return flushbuf();
+
+  return 0;
+
+}
+
+int gzfilebuf::flushbuf() {
+
+  int n;
+  char *q;
+
+  q = pbase();
+  n = pptr() - q;
+
+  if ( gzwrite( file, q, n) < n )
+    return EOF;
+
+  setp(0,0);
+
+  return 0;
+
+}
+
+int gzfilebuf::fillbuf() {
+
+  int required;
+  char *p;
+
+  p = base();
+
+  required = blen();
+
+  int t = gzread( file, p, required );
+
+  if ( t <= 0) return EOF;
+
+  setg( base(), base(), base()+t);
+
+  return t;
+
+}
+
+gzfilestream_common::gzfilestream_common() :
+  ios( gzfilestream_common::rdbuf() )
+{ }
+
+gzfilestream_common::~gzfilestream_common()
+{ }
+
+void gzfilestream_common::attach( int fd, int io_mode ) {
+
+  if ( !buffer.attach( fd, io_mode) )
+    clear( ios::failbit | ios::badbit );
+  else
+    clear();
+
+}
+
+void gzfilestream_common::open( const char *name, int io_mode ) {
+
+  if ( !buffer.open( name, io_mode ) )
+    clear( ios::failbit | ios::badbit );
+  else
+    clear();
+
+}
+
+void gzfilestream_common::close() {
+
+  if ( !buffer.close() )
+    clear( ios::failbit | ios::badbit );
+
+}
+
+gzfilebuf *gzfilestream_common::rdbuf() {
+
+  return &buffer;
+
+}
+     
+gzifstream::gzifstream() :
+  ios( gzfilestream_common::rdbuf() )
+{
+  clear( ios::badbit );
+}
+
+gzifstream::gzifstream( const char *name, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::open( name, io_mode );
+}
+
+gzifstream::gzifstream( int fd, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::attach( fd, io_mode );
+}
+
+gzifstream::~gzifstream() { }
+
+gzofstream::gzofstream() :
+  ios( gzfilestream_common::rdbuf() )
+{
+  clear( ios::badbit );
+}
+
+gzofstream::gzofstream( const char *name, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::open( name, io_mode );
+}
+
+gzofstream::gzofstream( int fd, int io_mode ) :
+  ios( gzfilestream_common::rdbuf() )
+{
+  gzfilestream_common::attach( fd, io_mode );
+}
+
+gzofstream::~gzofstream() { }

contrib/iostream/zfstream.h

@@ -0,0 +1,142 @@
+
+#ifndef _zfstream_h
+#define _zfstream_h
+
+#include <fstream.h>
+#include "zlib.h"
+
+class gzfilebuf : public streambuf {
+
+public:
+
+  gzfilebuf( );
+  virtual ~gzfilebuf();
+
+  gzfilebuf *open( const char *name, int io_mode );
+  gzfilebuf *attach( int file_descriptor, int io_mode );
+  gzfilebuf *close();
+
+  int setcompressionlevel( short comp_level );
+  int setcompressionstrategy( short comp_strategy );
+
+  inline int is_open() const { return (file !=NULL); }
+
+  virtual streampos seekoff( streamoff, ios::seek_dir, int );
+
+  virtual int sync();
+
+protected:
+
+  virtual int underflow();
+  virtual int overflow( int = EOF );
+
+private:
+
+  gzFile file;
+  short mode;
+  short own_file_descriptor;
+
+  int flushbuf();
+  int fillbuf();
+
+};
+
+class gzfilestream_common : virtual public ios {
+
+  friend class gzifstream;
+  friend class gzofstream;
+  friend gzofstream &setcompressionlevel( gzofstream &, int );
+  friend gzofstream &setcompressionstrategy( gzofstream &, int );
+
+public:
+  virtual ~gzfilestream_common();
+
+  void attach( int fd, int io_mode );
+  void open( const char *name, int io_mode );
+  void close();
+
+protected:
+  gzfilestream_common();
+
+private:
+  gzfilebuf *rdbuf();
+
+  gzfilebuf buffer;
+
+};
+
+class gzifstream : public gzfilestream_common, public istream {
+
+public:
+
+  gzifstream();
+  gzifstream( const char *name, int io_mode = ios::in );
+  gzifstream( int fd, int io_mode = ios::in );
+
+  virtual ~gzifstream();
+
+};
+
+class gzofstream : public gzfilestream_common, public ostream {
+
+public:
+
+  gzofstream();
+  gzofstream( const char *name, int io_mode = ios::out );
+  gzofstream( int fd, int io_mode = ios::out );
+
+  virtual ~gzofstream();
+
+};
+
+template<class T> class gzomanip {
+  friend gzofstream &operator<<(gzofstream &, const gzomanip<T> &);
+public:
+  gzomanip(gzofstream &(*f)(gzofstream &, T), T v) : func(f), val(v) { }
+private:
+  gzofstream &(*func)(gzofstream &, T);
+  T val;
+};
+
+template<class T> gzofstream &operator<<(gzofstream &s,
+					 const gzomanip<T> &m) {
+  return (*m.func)(s, m.val);
+  
+}
+
+inline gzofstream &setcompressionlevel( gzofstream &s, int l ) {
+  (s.rdbuf())->setcompressionlevel(l);
+  return s;
+}
+
+inline gzofstream &setcompressionstrategy( gzofstream &s, int l ) {
+  (s.rdbuf())->setcompressionstrategy(l);
+  return s;
+}
+
+inline gzomanip<int> setcompressionlevel(int l)
+{
+  return gzomanip<int>(&setcompressionlevel,l);
+}
+
+inline gzomanip<int> setcompressionstrategy(int l)
+{
+  return gzomanip<int>(&setcompressionstrategy,l);
+}
+
+#endif
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+

contrib/iostream2/zstream.h

@@ -0,0 +1,307 @@
+/*
+ *
+ * Copyright (c) 1997
+ * Christian Michelsen Research AS
+ * Advanced Computing
+ * Fantoftvegen 38, 5036 BERGEN, Norway
+ * http://www.cmr.no
+ *
+ * Permission to use, copy, modify, distribute and sell this software
+ * and its documentation for any purpose is hereby granted without fee,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.  Christian Michelsen Research AS makes no
+ * representations about the suitability of this software for any
+ * purpose.  It is provided "as is" without express or implied warranty.
+ *
+ */
+
+#ifndef ZSTREAM__H
+#define ZSTREAM__H
+
+/*
+ * zstream.h - C++ interface to the 'zlib' general purpose compression library
+ * $Id: zstream.h 1.1 1997-06-25 12:00:56+02 tyge Exp tyge $
+ */
+
+#include <strstream.h>
+#include <string.h>
+#include <stdio.h>
+#include "zlib.h"
+
+#if defined(_WIN32)
+#   include <fcntl.h>
+#   include <io.h>
+#   define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
+#else
+#   define SET_BINARY_MODE(file)
+#endif
+
+class zstringlen {
+public:
+    zstringlen(class izstream&);
+    zstringlen(class ozstream&, const char*);
+    size_t value() const { return val.word; }
+private:
+    struct Val { unsigned char byte; size_t word; } val;
+};
+
+//  ----------------------------- izstream -----------------------------
+
+class izstream
+{
+    public:
+        izstream() : m_fp(0) {}
+        izstream(FILE* fp) : m_fp(0) { open(fp); }
+        izstream(const char* name) : m_fp(0) { open(name); }
+        ~izstream() { close(); }
+
+        /* Opens a gzip (.gz) file for reading.
+         * open() can be used to read a file which is not in gzip format;
+         * in this case read() will directly read from the file without
+         * decompression. errno can be checked to distinguish two error
+         * cases (if errno is zero, the zlib error is Z_MEM_ERROR).
+         */
+        void open(const char* name) {
+            if (m_fp) close();
+            m_fp = ::gzopen(name, "rb");
+        }
+
+        void open(FILE* fp) {
+            SET_BINARY_MODE(fp);
+            if (m_fp) close();
+            m_fp = ::gzdopen(fileno(fp), "rb");
+        }
+
+        /* Flushes all pending input if necessary, closes the compressed file
+         * and deallocates all the (de)compression state. The return value is
+         * the zlib error number (see function error() below).
+         */
+        int close() {
+            int r = ::gzclose(m_fp);
+            m_fp = 0; return r;
+        }
+
+        /* Binary read the given number of bytes from the compressed file.
+         */
+        int read(void* buf, size_t len) {
+            return ::gzread(m_fp, buf, len);
+        }
+
+        /* Returns the error message for the last error which occurred on the
+         * given compressed file. errnum is set to zlib error number. If an
+         * error occurred in the file system and not in the compression library,
+         * errnum is set to Z_ERRNO and the application may consult errno
+         * to get the exact error code.
+         */
+        const char* error(int* errnum) {
+            return ::gzerror(m_fp, errnum);
+        }
+
+        gzFile fp() { return m_fp; }
+
+    private:
+        gzFile m_fp;
+};
+
+/*
+ * Binary read the given (array of) object(s) from the compressed file.
+ * If the input file was not in gzip format, read() copies the objects number
+ * of bytes into the buffer.
+ * returns the number of uncompressed bytes actually read
+ * (0 for end of file, -1 for error).
+ */
+template <class T, class Items>
+inline int read(izstream& zs, T* x, Items items) {
+    return ::gzread(zs.fp(), x, items*sizeof(T));
+}
+
+/*
+ * Binary input with the '>' operator.
+ */
+template <class T>
+inline izstream& operator>(izstream& zs, T& x) {
+    ::gzread(zs.fp(), &x, sizeof(T));
+    return zs;
+}
+
+
+inline zstringlen::zstringlen(izstream& zs) {
+    zs > val.byte;
+    if (val.byte == 255) zs > val.word;
+    else val.word = val.byte;
+}
+
+/*
+ * Read length of string + the string with the '>' operator.
+ */
+inline izstream& operator>(izstream& zs, char* x) {
+    zstringlen len(zs);
+    ::gzread(zs.fp(), x, len.value());
+    x[len.value()] = '\0';
+    return zs;
+}
+
+inline char* read_string(izstream& zs) {
+    zstringlen len(zs);
+    char* x = new char[len.value()+1];
+    ::gzread(zs.fp(), x, len.value());
+    x[len.value()] = '\0';
+    return x;
+}
+
+// ----------------------------- ozstream -----------------------------
+
+class ozstream
+{
+    public:
+        ozstream() : m_fp(0), m_os(0) {
+        }
+        ozstream(FILE* fp, int level = Z_DEFAULT_COMPRESSION)
+            : m_fp(0), m_os(0) {
+            open(fp, level);
+        }
+        ozstream(const char* name, int level = Z_DEFAULT_COMPRESSION)
+            : m_fp(0), m_os(0) {
+            open(name, level);
+        }
+        ~ozstream() {
+            close();
+        }
+
+        /* Opens a gzip (.gz) file for writing.
+         * The compression level parameter should be in 0..9
+         * errno can be checked to distinguish two error cases
+         * (if errno is zero, the zlib error is Z_MEM_ERROR).
+         */
+        void open(const char* name, int level = Z_DEFAULT_COMPRESSION) {
+            char mode[4] = "wb\0";
+            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
+            if (m_fp) close();
+            m_fp = ::gzopen(name, mode);
+        }
+
+        /* open from a FILE pointer.
+         */
+        void open(FILE* fp, int level = Z_DEFAULT_COMPRESSION) {
+            SET_BINARY_MODE(fp);
+            char mode[4] = "wb\0";
+            if (level != Z_DEFAULT_COMPRESSION) mode[2] = '0'+level;
+            if (m_fp) close();
+            m_fp = ::gzdopen(fileno(fp), mode);
+        }
+
+        /* Flushes all pending output if necessary, closes the compressed file
+         * and deallocates all the (de)compression state. The return value is
+         * the zlib error number (see function error() below).
+         */
+        int close() {
+            if (m_os) {
+                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
+                delete[] m_os->str(); delete m_os; m_os = 0;
+            }
+            int r = ::gzclose(m_fp); m_fp = 0; return r;
+        }
+
+        /* Binary write the given number of bytes into the compressed file.
+         */
+        int write(const void* buf, size_t len) {
+            return ::gzwrite(m_fp, (voidp) buf, len);
+        }
+
+        /* Flushes all pending output into the compressed file. The parameter
+         * _flush is as in the deflate() function. The return value is the zlib
+         * error number (see function gzerror below). flush() returns Z_OK if
+         * the flush_ parameter is Z_FINISH and all output could be flushed.
+         * flush() should be called only when strictly necessary because it can
+         * degrade compression.
+         */
+        int flush(int _flush) {
+            os_flush();
+            return ::gzflush(m_fp, _flush);
+        }
+
+        /* Returns the error message for the last error which occurred on the
+         * given compressed file. errnum is set to zlib error number. If an
+         * error occurred in the file system and not in the compression library,
+         * errnum is set to Z_ERRNO and the application may consult errno
+         * to get the exact error code.
+         */
+        const char* error(int* errnum) {
+            return ::gzerror(m_fp, errnum);
+        }
+
+        gzFile fp() { return m_fp; }
+
+        ostream& os() {
+            if (m_os == 0) m_os = new ostrstream;
+            return *m_os;
+        }
+
+        void os_flush() {
+            if (m_os && m_os->pcount()>0) {
+                ostrstream* oss = new ostrstream;
+                oss->fill(m_os->fill());
+                oss->flags(m_os->flags());
+                oss->precision(m_os->precision());
+                oss->width(m_os->width());
+                ::gzwrite(m_fp, m_os->str(), m_os->pcount());
+                delete[] m_os->str(); delete m_os; m_os = oss;
+            }
+        }
+
+    private:
+        gzFile m_fp;
+        ostrstream* m_os;
+};
+
+/*
+ * Binary write the given (array of) object(s) into the compressed file.
+ * returns the number of uncompressed bytes actually written
+ * (0 in case of error).
+ */
+template <class T, class Items>
+inline int write(ozstream& zs, const T* x, Items items) {
+    return ::gzwrite(zs.fp(), (voidp) x, items*sizeof(T));
+}
+
+/*
+ * Binary output with the '<' operator.
+ */
+template <class T>
+inline ozstream& operator<(ozstream& zs, const T& x) {
+    ::gzwrite(zs.fp(), (voidp) &x, sizeof(T));
+    return zs;
+}
+
+inline zstringlen::zstringlen(ozstream& zs, const char* x) {
+    val.byte = 255;  val.word = ::strlen(x);
+    if (val.word < 255) zs < (val.byte = val.word);
+    else zs < val;
+}
+
+/*
+ * Write length of string + the string with the '<' operator.
+ */
+inline ozstream& operator<(ozstream& zs, const char* x) {
+    zstringlen len(zs, x);
+    ::gzwrite(zs.fp(), (voidp) x, len.value());
+    return zs;
+}
+
+#ifdef _MSC_VER
+inline ozstream& operator<(ozstream& zs, char* const& x) {
+    return zs < (const char*) x;
+}
+#endif
+
+/*
+ * Ascii write with the << operator;
+ */
+template <class T>
+inline ostream& operator<<(ozstream& zs, const T& x) {
+    zs.os_flush();
+    return zs.os() << x;
+}
+
+#endif

contrib/iostream2/zstream_test.cpp

@@ -0,0 +1,25 @@
+#include "zstream.h"
+#include <math.h>
+#include <stdlib.h>
+#include <iomanip.h>
+
+void main() {
+	char h[256] = "Hello";
+	char* g = "Goodbye";
+	ozstream out("temp.gz");
+    out < "This works well" < h < g;
+    out.close();
+
+    izstream in("temp.gz"); // read it back
+    char *x = read_string(in), *y = new char[256], z[256];
+    in > y > z;
+    in.close();
+    cout << x << endl << y << endl << z << endl;
+
+    out.open("temp.gz"); // try ascii output; zcat temp.gz to see the results
+    out << setw(50) << setfill('#') << setprecision(20) << x << endl << y << endl << z << endl;
+    out << z << endl << y << endl << x << endl;
+    out << 1.1234567890123456789 << endl;
+
+    delete[] x; delete[] y;
+}

contrib/untgz/Makefile

@@ -0,0 +1,14 @@
+CC=cc
+CFLAGS=-g
+
+untgz: untgz.o  ../../libz.a
+	$(CC) $(CFLAGS) -o untgz  untgz.o -L../.. -lz
+
+untgz.o: untgz.c ../../zlib.h
+	$(CC) $(CFLAGS) -c -I../.. untgz.c
+
+../../libz.a:
+	cd ../..; make
+
+clean:
+	rm -f untgz untgz.o *~

contrib/untgz/makefile.w32

@@ -0,0 +1,63 @@
+# Makefile for zlib.  Modified for mingw32
+# For conditions of distribution and use, see copyright notice in zlib.h 
+
+# To compile, 
+# 
+#   make -fmakefile.w32
+# 
+
+CC=gcc
+
+# Generate dependencies (see end of the file)
+
+CPPFLAGS=-MMD 
+
+#CFLAGS=-MMD -O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-MMD -g -DDEBUG
+CFLAGS=-O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+             -Wstrict-prototypes -Wmissing-prototypes
+
+# If cp.exe is not found, replace with copy /Y .
+CP=cp -f
+
+# The default value of RM is "rm -f."  
+# If "rm.exe" is not found, uncomment:
+# RM=del
+
+LD=gcc
+LDLIBS=-L. -lz
+LDFLAGS=-s
+
+
+INCL=zlib.h zconf.h
+LIBS=libz.a
+
+AR=ar rcs
+
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o \
+       inffast.o
+
+TEST_OBJS = minigzip.o untgz.o
+
+all: minigzip.exe untgz.exe
+
+rebuild:	clean	all
+
+libz.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+
+%.exe : %.o $(LIBS)
+	$(LD) $(LDFLAGS) -o $@ $< $(LDLIBS)
+
+.PHONY : clean
+
+clean:
+	$(RM) *.d *.o *.exe libz.a foo.gz
+
+DEPS := $(wildcard *.d)
+ifneq ($(DEPS),)
+include $(DEPS)
+endif
+

contrib/untgz/untgz.c

@@ -0,0 +1,478 @@
+/*
+ * untgz.c -- Display contents and/or extract file from
+ * a gzip'd TAR file
+ * written by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+ * adaptation to Unix by Jean-loup Gailly <jloup@gzip.org>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <utime.h>
+#include <errno.h>
+#include <fcntl.h>
+#ifdef unix
+# include <unistd.h>
+#else
+# include <direct.h>
+# include <io.h>
+#endif
+
+#include "zlib.h"
+
+/* Values used in typeflag field.  */
+
+#define REGTYPE	 '0'		/* regular file */
+#define AREGTYPE '\0'		/* regular file */
+#define LNKTYPE  '1'		/* link */
+#define SYMTYPE  '2'		/* reserved */
+#define CHRTYPE  '3'		/* character special */
+#define BLKTYPE  '4'		/* block special */
+#define DIRTYPE  '5'		/* directory */
+#define FIFOTYPE '6'		/* FIFO special */
+#define CONTTYPE '7'		/* reserved */
+
+#define BLOCKSIZE 512
+
+struct tar_header
+{				/* byte offset */
+  char name[100];		/*   0 */
+  char mode[8];			/* 100 */
+  char uid[8];			/* 108 */
+  char gid[8];			/* 116 */
+  char size[12];		/* 124 */
+  char mtime[12];		/* 136 */
+  char chksum[8];		/* 148 */
+  char typeflag;		/* 156 */
+  char linkname[100];		/* 157 */
+  char magic[6];		/* 257 */
+  char version[2];		/* 263 */
+  char uname[32];		/* 265 */
+  char gname[32];		/* 297 */
+  char devmajor[8];		/* 329 */
+  char devminor[8];		/* 337 */
+  char prefix[155];		/* 345 */
+				/* 500 */
+};
+
+union tar_buffer {
+  char               buffer[BLOCKSIZE];
+  struct tar_header  header;
+};
+
+enum { TGZ_EXTRACT = 0, TGZ_LIST };
+
+static char *TGZfname	OF((const char *));
+void TGZnotfound	OF((const char *));
+
+int getoct		OF((char *, int));
+char *strtime		OF((time_t *));
+int ExprMatch		OF((char *,char *));
+
+int makedir		OF((char *));
+int matchname		OF((int,int,char **,char *));
+
+void error		OF((const char *));
+int  tar		OF((gzFile, int, int, int, char **));
+
+void help		OF((int));
+int main		OF((int, char **));
+
+char *prog;
+
+/* This will give a benign warning */
+
+static char *TGZprefix[] = { "\0", ".tgz", ".tar.gz", NULL };
+
+/* Return the real name of the TGZ archive */
+/* or NULL if it does not exist. */
+
+static char *TGZfname OF((const char *fname))
+{
+  static char buffer[1024];
+  int origlen,i;
+  
+  strcpy(buffer,fname);
+  origlen = strlen(buffer);
+
+  for (i=0; TGZprefix[i]; i++)
+    {
+       strcpy(buffer+origlen,TGZprefix[i]);
+       if (access(buffer,F_OK) == 0)
+         return buffer;
+    }
+  return NULL;
+}
+
+/* error message for the filename */
+
+void TGZnotfound OF((const char *fname))
+{
+  int i;
+
+  fprintf(stderr,"%s : couldn't find ",prog);
+  for (i=0;TGZprefix[i];i++)
+    fprintf(stderr,(TGZprefix[i+1]) ? "%s%s, " : "or %s%s\n",
+            fname,
+            TGZprefix[i]);
+  exit(1);
+}
+
+
+/* help functions */
+
+int getoct(char *p,int width)
+{
+  int result = 0;
+  char c;
+  
+  while (width --)
+    {
+      c = *p++;
+      if (c == ' ')
+	continue;
+      if (c == 0)
+	break;
+      result = result * 8 + (c - '0');
+    }
+  return result;
+}
+
+char *strtime (time_t *t)
+{
+  struct tm   *local;
+  static char result[32];
+
+  local = localtime(t);
+  sprintf(result,"%2d/%02d/%4d %02d:%02d:%02d",
+	  local->tm_mday, local->tm_mon+1, local->tm_year+1900,
+	  local->tm_hour, local->tm_min,   local->tm_sec);
+  return result;
+}
+
+
+/* regular expression matching */
+
+#define ISSPECIAL(c) (((c) == '*') || ((c) == '/'))
+
+int ExprMatch(char *string,char *expr)
+{
+  while (1)
+    {
+      if (ISSPECIAL(*expr))
+	{
+	  if (*expr == '/')
+	    {
+	      if (*string != '\\' && *string != '/')
+		return 0;
+	      string ++; expr++;
+	    }
+	  else if (*expr == '*')
+	    {
+	      if (*expr ++ == 0)
+		return 1;
+	      while (*++string != *expr)
+		if (*string == 0)
+		  return 0;
+	    }
+	}
+      else
+	{
+	  if (*string != *expr)
+	    return 0;
+	  if (*expr++ == 0)
+	    return 1;
+	  string++;
+	}
+    }
+}
+
+/* recursive make directory */
+/* abort if you get an ENOENT errno somewhere in the middle */
+/* e.g. ignore error "mkdir on existing directory" */
+/* */
+/* return 1 if OK */
+/*        0 on error */
+
+int makedir (char *newdir)
+{
+  char *buffer = strdup(newdir);
+  char *p;
+  int  len = strlen(buffer);
+  
+  if (len <= 0) {
+    free(buffer);
+    return 0;
+  }
+  if (buffer[len-1] == '/') {
+    buffer[len-1] = '\0';
+  }
+  if (mkdir(buffer, 0775) == 0)
+    {
+      free(buffer);
+      return 1;
+    }
+
+  p = buffer+1;
+  while (1)
+    {
+      char hold;
+      
+      while(*p && *p != '\\' && *p != '/')
+	p++;
+      hold = *p;
+      *p = 0;
+      if ((mkdir(buffer, 0775) == -1) && (errno == ENOENT))
+	{
+	  fprintf(stderr,"%s: couldn't create directory %s\n",prog,buffer);
+	  free(buffer);
+	  return 0;
+	}
+      if (hold == 0)
+	break;
+      *p++ = hold;
+    }
+  free(buffer);
+  return 1;
+}
+
+int matchname (int arg,int argc,char **argv,char *fname)
+{
+  if (arg == argc)		/* no arguments given (untgz tgzarchive) */
+    return 1;
+
+  while (arg < argc)
+    if (ExprMatch(fname,argv[arg++]))
+      return 1;
+
+  return 0; /* ignore this for the moment being */
+}
+
+
+/* Tar file list or extract */
+
+int tar (gzFile in,int action,int arg,int argc,char **argv)
+{
+  union  tar_buffer buffer;
+  int    len;
+  int    err;
+  int    getheader = 1;
+  int    remaining = 0;
+  FILE   *outfile = NULL;
+  char   fname[BLOCKSIZE];
+  time_t tartime;
+  
+  if (action == TGZ_LIST)
+    printf("     day      time     size                       file\n"
+	   " ---------- -------- --------- -------------------------------------\n");
+  while (1)
+    {
+      len = gzread(in, &buffer, BLOCKSIZE);
+      if (len < 0)
+	error (gzerror(in, &err));
+      /*
+       * if we met the end of the tar
+       * or the end-of-tar block,
+       * we are done
+       */
+      if ((len == 0)  || (buffer.header.name[0]== 0))
+	break;
+      
+      /*
+       * Always expect complete blocks to process
+       * the tar information.
+       */
+      if (len != BLOCKSIZE)
+	error("gzread: incomplete block read");
+      
+      /*
+       * If we have to get a tar header
+       */
+      if (getheader == 1)
+	{
+	  tartime = (time_t)getoct(buffer.header.mtime,12);
+	  strcpy(fname,buffer.header.name);
+	  
+	  switch (buffer.header.typeflag)
+	    {
+	    case DIRTYPE:
+	      if (action == TGZ_LIST)
+		printf(" %s     <dir> %s\n",strtime(&tartime),fname);
+	      if (action == TGZ_EXTRACT)
+		makedir(fname);
+	      break;
+	    case REGTYPE:
+	    case AREGTYPE:
+	      remaining = getoct(buffer.header.size,12);
+	      if (action == TGZ_LIST)
+		printf(" %s %9d %s\n",strtime(&tartime),remaining,fname);
+	      if (action == TGZ_EXTRACT)
+		{
+		  if ((remaining) && (matchname(arg,argc,argv,fname)))
+		    {
+		      outfile = fopen(fname,"wb");
+		      if (outfile == NULL) {
+			/* try creating directory */
+			char *p = strrchr(fname, '/');
+			if (p != NULL) {
+			  *p = '\0';
+			  makedir(fname);
+			  *p = '/';
+			  outfile = fopen(fname,"wb");
+			}
+		      }
+		      fprintf(stderr,
+			      "%s %s\n",
+			      (outfile) ? "Extracting" : "Couldn't create",
+			      fname);
+		    }
+		  else
+		    outfile = NULL;
+		}
+	      /*
+	       * could have no contents
+	       */
+	      getheader = (remaining) ? 0 : 1;
+	      break;
+	    default:
+	      if (action == TGZ_LIST)
+		printf(" %s     <---> %s\n",strtime(&tartime),fname);
+	      break;
+	    }
+	}
+      else
+	{
+	  unsigned int bytes = (remaining > BLOCKSIZE) ? BLOCKSIZE : remaining;
+
+	  if ((action == TGZ_EXTRACT) && (outfile != NULL))
+	    {
+	      if (fwrite(&buffer,sizeof(char),bytes,outfile) != bytes)
+		{
+		  fprintf(stderr,"%s : error writing %s skipping...\n",prog,fname);
+		  fclose(outfile);
+		  unlink(fname);
+		}
+	    }
+	  remaining -= bytes;
+	  if (remaining == 0)
+	    {
+	      getheader = 1;
+	      if ((action == TGZ_EXTRACT) && (outfile != NULL))
+		{
+		  struct utimbuf settime;
+
+		  settime.actime = settime.modtime = tartime;
+
+		  fclose(outfile);
+		  outfile = NULL;
+		  utime(fname,&settime);
+		}
+	    }
+	}
+    }
+  
+  if (gzclose(in) != Z_OK)
+    error("failed gzclose");
+
+  return 0;
+}
+
+
+/* =========================================================== */
+
+void help(int exitval)
+{
+  fprintf(stderr,
+	  "untgz v 0.1\n"
+	  " an sample application of zlib 1.0.4\n\n"
+          "Usage : untgz TGZfile            to extract all files\n"
+          "        untgz TGZfile fname ...  to extract selected files\n"
+          "        untgz -l TGZfile         to list archive contents\n"
+          "        untgz -h                 to display this help\n\n");
+  exit(exitval);
+}
+
+void error(const char *msg)
+{
+    fprintf(stderr, "%s: %s\n", prog, msg);
+    exit(1);
+}
+
+
+/* ====================================================================== */
+
+int _CRT_glob = 0;	/* disable globbing of the arguments */
+
+int main(int argc,char **argv)
+{
+    int 	action = TGZ_EXTRACT;
+    int 	arg = 1;
+    char	*TGZfile;
+    gzFile	*f;
+    
+
+    prog = strrchr(argv[0],'\\');
+    if (prog == NULL)
+      {
+	prog = strrchr(argv[0],'/');
+	if (prog == NULL)
+	  {
+	    prog = strrchr(argv[0],':');
+	    if (prog == NULL)
+	      prog = argv[0];
+	    else
+	      prog++;
+	  }
+	else
+	  prog++;
+      }
+    else
+      prog++;
+    
+    if (argc == 1)
+      help(0);
+
+    if (strcmp(argv[arg],"-l") == 0)
+      {
+	action = TGZ_LIST;
+	if (argc == ++arg)
+	  help(0);
+      }
+    else if (strcmp(argv[arg],"-h") == 0)
+      {
+	help(0);
+      }
+
+    if ((TGZfile = TGZfname(argv[arg])) == NULL)
+      TGZnotfound(argv[arg]);            
+
+    ++arg;
+    if ((action == TGZ_LIST) && (arg != argc))
+      help(1);
+
+/*
+ *  Process the TGZ file
+ */
+    switch(action)
+      {
+      case TGZ_LIST:
+      case TGZ_EXTRACT:
+	f = gzopen(TGZfile,"rb");
+	if (f == NULL)
+	  {
+	    fprintf(stderr,"%s: Couldn't gzopen %s\n",
+		    prog,
+		    TGZfile);
+	    return 1;
+	  }
+	exit(tar(f, action, arg, argc, argv));
+      break;
+	
+      default:
+	error("Unknown option!");
+	exit(1);
+      }
+
+    return 0;
+}

contrib/visual-basic.txt

@@ -0,0 +1,57 @@
+From: "Jon Caruana" <jon-net@usa.net>
+To: "Jean-loup Gailly" <gzip@prep.ai.mit.edu>
+Subject: Re: How to port zlib declares to vb?
+Date: Mon, 28 Oct 1996 18:33:03 -0600
+
+Got the answer! (I haven't had time to check this but it's what I got, and
+looks correct):
+
+He has the following routines working:
+        compress
+        uncompress
+        gzopen
+        gzwrite
+        gzread
+        gzclose
+
+Declares follow: (Quoted from Carlos Rios <c_rios@sonda.cl>, in Vb4 form)
+
+#If Win16 Then   'Use Win16 calls.
+Declare Function compress Lib "ZLIB.DLL" (ByVal compr As
+        String, comprLen As Any, ByVal buf As String, ByVal buflen
+        As Long) As Integer
+Declare Function uncompress Lib "ZLIB.DLL" (ByVal uncompr
+        As String, uncomprLen As Any, ByVal compr As String, ByVal
+        lcompr As Long) As Integer
+Declare Function gzopen Lib "ZLIB.DLL" (ByVal filePath As
+        String, ByVal mode As String) As Long
+Declare Function gzread Lib "ZLIB.DLL" (ByVal file As
+        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
+        As Integer
+Declare Function gzwrite Lib "ZLIB.DLL" (ByVal file As
+        Long, ByVal uncompr As String, ByVal uncomprLen As Integer)
+        As Integer
+Declare Function gzclose Lib "ZLIB.DLL" (ByVal file As
+        Long) As Integer
+#Else
+Declare Function compress Lib "ZLIB32.DLL"
+        (ByVal compr As String, comprLen As Any, ByVal buf As
+        String, ByVal buflen As Long) As Integer
+Declare Function uncompress Lib "ZLIB32.DLL"
+        (ByVal uncompr As String, uncomprLen As Any, ByVal compr As
+        String, ByVal lcompr As Long) As Long
+Declare Function gzopen Lib "ZLIB32.DLL"
+        (ByVal file As String, ByVal mode As String) As Long
+Declare Function gzread Lib "ZLIB32.DLL"
+        (ByVal file As Long, ByVal uncompr As String, ByVal
+        uncomprLen As Long) As Long
+Declare Function gzwrite Lib "ZLIB32.DLL"
+        (ByVal file As Long, ByVal uncompr As String, ByVal
+        uncomprLen As Long) As Long
+Declare Function gzclose Lib "ZLIB32.DLL"
+        (ByVal file As Long) As Long
+#End If
+
+-Jon Caruana
+jon-net@usa.net
+Microsoft Sitebuilder Network Level 1 Member - HTML Writer's Guild Member

crc32.c

@@ -1,32 +1,62 @@
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: crc32.c,v 1.4 1995/04/14 14:55:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
 #define local static
 
 #ifdef DYNAMIC_CRC_TABLE
-/* =========================================================================
- * Make the crc table. This function is needed only if you want to compute
- * the table dynamically.
- */
-local int crc_table_empty = 1;
-local uLong crc_table[256];
 
+local int crc_table_empty = 1;
+local uLongf crc_table[256];
+local void make_crc_table OF((void));
+
+/*
+  Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
+  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
+
+  Polynomials over GF(2) are represented in binary, one bit per coefficient,
+  with the lowest powers in the most significant bit.  Then adding polynomials
+  is just exclusive-or, and multiplying a polynomial by x is a right shift by
+  one.  If we call the above polynomial p, and represent a byte as the
+  polynomial q, also with the lowest power in the most significant bit (so the
+  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
+  where a mod b means the remainder after dividing a by b.
+
+  This calculation is done using the shift-register method of multiplying and
+  taking the remainder.  The register is initialized to zero, and for each
+  incoming bit, x^32 is added mod p to the register if the bit is a one (where
+  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
+  x (which is shifting right by one and adding x^32 mod p if the bit shifted
+  out is a one).  We start with the highest power (least significant bit) of
+  q and repeat for all eight bits of q.
+
+  The table is simply the CRC of all possible eight bit values.  This is all
+  the information needed to generate CRC's on data a byte at a time for all
+  combinations of CRC register values and incoming bytes.
+*/
 local void make_crc_table()
 {
   uLong c;
   int n, k;
+  uLong poly;            /* polynomial exclusive-or pattern */
+  /* terms of polynomial defining this crc (except x^32): */
+  static Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
+
+  /* make exclusive-or pattern from polynomial (0xedb88320L) */
+  poly = 0L;
+  for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
+    poly |= 1L << (31 - p[n]);
  
   for (n = 0; n < 256; n++)
   {
     c = (uLong)n;
     for (k = 0; k < 8; k++)
-      c = c & 1 ? 0xedb88320L ^ (c >> 1) : c >> 1;
+      c = c & 1 ? poly ^ (c >> 1) : c >> 1;
     crc_table[n] = c;
   }
   crc_table_empty = 0;
@@ -35,7 +65,7 @@ local void make_crc_table()
 /* ========================================================================
  * Table of CRC-32's of all single-byte values (made by make_crc_table)
  */
-local uLong crc_table[] = {
+local uLongf crc_table[256] = {
   0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
   0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
   0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
@@ -91,15 +121,27 @@ local uLong crc_table[] = {
 };
 #endif
 
+/* =========================================================================
+ * This function can be used by asm versions of crc32()
+ */
+uLongf * EXPORT get_crc_table()
+{
+#ifdef DYNAMIC_CRC_TABLE
+  if (crc_table_empty) make_crc_table();
+#endif
+  return (uLongf *)crc_table;
+}
+
+/* ========================================================================= */
 #define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
 #define DO2(buf)  DO1(buf); DO1(buf);
 #define DO4(buf)  DO2(buf); DO2(buf);
 #define DO8(buf)  DO4(buf); DO4(buf);
 
 /* ========================================================================= */
-uLong crc32(crc, buf, len)
+uLong EXPORT crc32(crc, buf, len)
     uLong crc;
-    Bytef *buf;
+    const Bytef *buf;
     uInt len;
 {
     if (buf == Z_NULL) return 0L;

deflate.h

@@ -1,5 +1,5 @@
 /* deflate.h -- internal compression state
- * Copyright (C) 1995 Jean-loup Gailly
+ * Copyright (C) 1995-1998 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,7 +8,10 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: deflate.h,v 1.5 1995/05/03 17:27:09 jloup Exp $ */
+/* @(#) $Id$ */
+
+#ifndef _DEFLATE_H
+#define _DEFLATE_H
 
 #include "zutil.h"
 
@@ -16,11 +19,6 @@
  * Internal compression state.
  */
 
-/* Data type */
-#define BINARY  0
-#define ASCII   1
-#define UNKNOWN 2
-
 #define LENGTH_CODES 29
 /* number of length codes, not counting the special END_BLOCK code */
 
@@ -82,15 +80,16 @@ typedef unsigned IPos;
  */
 
 typedef struct internal_state {
-    z_stream *strm;      /* pointer back to this zlib stream */
+    z_streamp strm;      /* pointer back to this zlib stream */
     int   status;        /* as the name implies */
     Bytef *pending_buf;  /* output still pending */
+    ulg   pending_buf_size; /* size of pending_buf */
     Bytef *pending_out;  /* next pending byte to output to the stream */
     int   pending;       /* nb of bytes in the pending buffer */
-    uLong adler;         /* adler32 of uncompressed data */
     int   noheader;      /* suppress zlib header and adler32 */
     Byte  data_type;     /* UNKNOWN, BINARY or ASCII */
     Byte  method;        /* STORED (for zip only) or DEFLATED */
+    int   last_flush;    /* value of flush param for previous deflate call */
 
                 /* used by deflate.c: */
 
@@ -233,6 +232,7 @@ typedef struct internal_state {
     ulg static_len;     /* bit length of current block with static trees */
     ulg compressed_len; /* total bit length of compressed file */
     uInt matches;       /* number of string matches in current block */
+    int last_eob_len;   /* bit length of EOB code for last block */
 
 #ifdef DEBUG
     ulg bits_sent;      /* bit length of the compressed data */
@@ -266,9 +266,11 @@ typedef struct internal_state {
  */
 
         /* in trees.c */
-void ct_init       OF((deflate_state *s));
+void _tr_init         OF((deflate_state *s));
-int  ct_tally      OF((deflate_state *s, int dist, int lc));
+int  _tr_tally        OF((deflate_state *s, unsigned dist, unsigned lc));
-ulg ct_flush_block OF((deflate_state *s, charf *buf, ulg stored_len, int eof));
+ulg  _tr_flush_block  OF((deflate_state *s, charf *buf, ulg stored_len,
-void ct_align      OF((deflate_state *s));
-void ct_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
 			  int eof));
+void _tr_align        OF((deflate_state *s));
+void _tr_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
+                          int eof));
+#endif

example.c

@@ -1,29 +1,20 @@
 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.9 1995/05/03 17:27:09 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
 
 #ifdef STDC
 #  include <string.h>
-#endif
+#  include <stdlib.h>
-
+#else
-#ifndef __GO32__
    extern void exit  OF((int));
 #endif
 
-#define BUFLEN 4096
-
-#define local static
-/* For MSDOS and other systems with limitation on stack size. For Unix,
-    #define local
-   works also.
- */
-
 #define CHECK_ERR(err, msg) { \
     if (err != Z_OK) { \
         fprintf(stderr, "%s error: %d\n", msg, err); \
@@ -31,32 +22,44 @@ extern void exit  OF((int));
     } \
 }
 
-char *hello = "hello, hello!";
+const char hello[] = "hello, hello!";
 /* "hello world" would be more standard, but the repeated "hello"
  * stresses the compression code better, sorry...
  */
 
-void test_compress OF((void));
+const char dictionary[] = "hello";
-void test_gzio     OF((char *out, char *in));
+uLong dictId; /* Adler32 value of the dictionary */
-void test_deflate  OF((Byte compr[]));
+
-void test_inflate  OF((Byte compr[]));
+void test_compress      OF((Byte *compr, uLong comprLen,
-void test_flush    OF((Byte compr[]));
+		            Byte *uncompr, uLong uncomprLen));
-void test_sync     OF((Byte compr[]));
+void test_gzio          OF((const char *out, const char *in, 
+		            Byte *uncompr, int uncomprLen));
+void test_deflate       OF((Byte *compr, uLong comprLen));
+void test_inflate       OF((Byte *compr, uLong comprLen,
+		            Byte *uncompr, uLong uncomprLen));
+void test_large_deflate OF((Byte *compr, uLong comprLen,
+		            Byte *uncompr, uLong uncomprLen));
+void test_large_inflate OF((Byte *compr, uLong comprLen,
+		            Byte *uncompr, uLong uncomprLen));
+void test_flush         OF((Byte *compr, uLong comprLen));
+void test_sync          OF((Byte *compr, uLong comprLen,
+		            Byte *uncompr, uLong uncomprLen));
+void test_dict_deflate  OF((Byte *compr, uLong comprLen));
+void test_dict_inflate  OF((Byte *compr, uLong comprLen,
+		            Byte *uncompr, uLong uncomprLen));
 int  main               OF((int argc, char *argv[]));
 
 /* ===========================================================================
  * Test compress() and uncompress()
  */
-void test_compress()
+void test_compress(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte compr[BUFLEN];
-    uLong comprLen = sizeof(compr);
-    local Byte uncompr[BUFLEN];
-    uLong uncomprLen = sizeof(uncompr);
     int err;
     uLong len = strlen(hello)+1;
 
-    err = compress(compr, &comprLen, (Byte*)hello, len);
+    err = compress(compr, &comprLen, (const Bytef*)hello, len);
     CHECK_ERR(err, "compress");
 
     strcpy((char*)uncompr, "garbage");
@@ -74,25 +77,26 @@ void test_compress()
 /* ===========================================================================
  * Test read/write of .gz files
  */
-void test_gzio(out, in)
+void test_gzio(out, in, uncompr, uncomprLen)
-    char *out; /* output file */
+    const char *out; /* output file */
-    char *in;  /* input file */
+    const char *in;  /* input file */
+    Byte *uncompr;
+    int  uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
-    int uncomprLen = sizeof(uncompr);
     int err;
     int len = strlen(hello)+1;
     gzFile file;
+    z_off_t pos;
 
     file = gzopen(out, "wb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
-
+    if (gzprintf(file, "%s, %s!", "hello", "hello") != len-1) {
-    if (gzwrite(file, hello, len) != len) {
+        fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
-        fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
     }
+    gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
     gzclose(file);
 
     file = gzopen(in, "rb");
@@ -101,24 +105,40 @@ void test_gzio(out, in)
     }
     strcpy((char*)uncompr, "garbage");
 
-    uncomprLen = gzread(file, uncompr, uncomprLen);
+    uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
     if (uncomprLen != len) {
         fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
     }
-    gzclose(file);
-
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad gzread\n");
     } else {
         printf("gzread(): %s\n", uncompr);
     }
+
+    pos = gzseek(file, -7L, SEEK_CUR);
+    if (pos != 7 || gztell(file) != pos) {
+	fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
+		pos, gztell(file));
+    }
+    uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
+    if (uncomprLen != 7) {
+        fprintf(stderr, "gzread err after gzseek: %s\n", gzerror(file, &err));
+    }
+    if (strcmp((char*)uncompr, hello+7)) {
+        fprintf(stderr, "bad gzread after gzseek\n");
+    } else {
+        printf("gzread() after gzseek: %s\n", uncompr);
+    }
+
+    gzclose(file);
 }
 
 /* ===========================================================================
  * Test deflate() with small buffers
  */
-void test_deflate(compr)
+void test_deflate(compr, comprLen)
-    Byte compr[];
+    Byte *compr;
+    uLong comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
@@ -126,14 +146,15 @@ void test_deflate(compr)
 
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
 
     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");
 
-    c_stream.next_in  = (Byte*)hello;
+    c_stream.next_in  = (Bytef*)hello;
     c_stream.next_out = compr;
 
-    while (c_stream.total_in != (uLong)len) {
+    while (c_stream.total_in != (uLong)len && c_stream.total_out < comprLen) {
         c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
         err = deflate(&c_stream, Z_NO_FLUSH);
         CHECK_ERR(err, "deflate");
@@ -153,10 +174,10 @@ void test_deflate(compr)
 /* ===========================================================================
  * Test inflate() with small buffers
  */
-void test_inflate(compr)
+void test_inflate(compr, comprLen, uncompr, uncomprLen)
-    Byte compr[];
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
     int err;
     z_stream d_stream; /* decompression stream */
 
@@ -164,14 +185,16 @@ void test_inflate(compr)
 
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = 0;
+    d_stream.next_out = uncompr;
 
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
 
-    d_stream.next_in  = compr;
+    while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
-    d_stream.next_out = uncompr;
-
-    for (;;) {
         d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
         err = inflate(&d_stream, Z_NO_FLUSH);
         if (err == Z_STREAM_END) break;
@@ -188,11 +211,105 @@ void test_inflate(compr)
     }
 }
 
+/* ===========================================================================
+ * Test deflate() with large buffers and dynamic change of compression level
+ */
+void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_BEST_SPEED);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+
+    /* At this point, uncompr is still mostly zeroes, so it should compress
+     * very well:
+     */
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+    if (c_stream.avail_in != 0) {
+        fprintf(stderr, "deflate not greedy\n");
+    }
+
+    /* Feed in already compressed data and switch to no compression: */
+    deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
+    c_stream.next_in = compr;
+    c_stream.avail_in = (uInt)comprLen/2;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    /* Switch back to compressing mode: */
+    deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflate() with large buffers
+ */
+void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = (alloc_func)0;
+    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    for (;;) {
+        d_stream.next_out = uncompr;            /* discard the output */
+	d_stream.avail_out = (uInt)uncomprLen;
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+        CHECK_ERR(err, "large inflate");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
+        fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
+    } else {
+        printf("large_inflate(): OK\n");
+    }
+}
+
 /* ===========================================================================
  * Test deflate() with full flush
  */
-void test_flush(compr)
+void test_flush(compr, comprLen)
-    Byte compr[];
+    Byte *compr;
+    uLong comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
@@ -200,14 +317,15 @@ void test_flush(compr)
 
     c_stream.zalloc = (alloc_func)0;
     c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
 
     err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
     CHECK_ERR(err, "deflateInit");
 
-    c_stream.next_in  = (Byte*)hello;
+    c_stream.next_in  = (Bytef*)hello;
     c_stream.next_out = compr;
     c_stream.avail_in = 3;
-    c_stream.avail_out = BUFLEN;
+    c_stream.avail_out = (uInt)comprLen;
     err = deflate(&c_stream, Z_FULL_FLUSH);
     CHECK_ERR(err, "deflate");
 
@@ -225,10 +343,10 @@ void test_flush(compr)
 /* ===========================================================================
  * Test inflateSync()
  */
-void test_sync(compr)
+void test_sync(compr, comprLen, uncompr, uncomprLen)
-    Byte compr[];
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
     int err;
     z_stream d_stream; /* decompression stream */
 
@@ -236,20 +354,22 @@ void test_sync(compr)
 
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = 2; /* just read the zlib header */
 
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
 
-    d_stream.next_in  = compr;
     d_stream.next_out = uncompr;
-    d_stream.avail_in = 2; /* just read the zlib header */
+    d_stream.avail_out = (uInt)uncomprLen;
-    d_stream.avail_out = sizeof(uncompr);
 
     inflate(&d_stream, Z_NO_FLUSH);
     CHECK_ERR(err, "inflate");
 
-    d_stream.avail_in = BUFLEN-2; /* let inflate read all compressed data */
+    d_stream.avail_in = (uInt)comprLen-2;   /* read all compressed data */
-    err = inflateSync(&d_stream); /* skip the damaged part */
+    err = inflateSync(&d_stream);           /* but skip the damaged part */
     CHECK_ERR(err, "inflateSync");
 
     err = inflate(&d_stream, Z_FINISH);
@@ -263,6 +383,91 @@ void test_sync(compr)
     printf("after inflateSync(): hel%s\n", uncompr);
 }
 
+/* ===========================================================================
+ * Test deflate() with preset dictionary
+ */
+void test_dict_deflate(compr, comprLen)
+    Byte *compr;
+    uLong comprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
+
+    err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    err = deflateSetDictionary(&c_stream,
+			       (const Bytef*)dictionary, sizeof(dictionary));
+    CHECK_ERR(err, "deflateSetDictionary");
+
+    dictId = c_stream.adler;
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+
+    c_stream.next_in = (Bytef*)hello;
+    c_stream.avail_in = (uInt)strlen(hello)+1;
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflate() with a preset dictionary
+ */
+void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
+    Byte *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = (alloc_func)0;
+    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
+    d_stream.next_out = uncompr;
+    d_stream.avail_out = (uInt)uncomprLen;
+
+    for (;;) {
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+	if (err == Z_NEED_DICT) {
+	    if (d_stream.adler != dictId) {
+		fprintf(stderr, "unexpected dictionary");
+		exit(1);
+	    }
+	    err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
+				       sizeof(dictionary));
+	}
+        CHECK_ERR(err, "inflate with dict");
+    }
+
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad inflate with dict\n");
+    } else {
+        printf("inflate with dictionary: %s\n", uncompr);
+    }
+}
+
 /* ===========================================================================
  * Usage:  example [output.gz  [input.gz]]
  */
@@ -271,25 +476,45 @@ int main(argc, argv)
     int argc;
     char *argv[];
 {
-    local Byte compr[BUFLEN];
+    Byte *compr, *uncompr;
+    uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
+    uLong uncomprLen = comprLen;
+    static const char* myVersion = ZLIB_VERSION;
 
-    if (zlib_version[0] != ZLIB_VERSION[0]) {
+    if (zlibVersion()[0] != myVersion[0]) {
         fprintf(stderr, "incompatible zlib version\n");
         exit(1);
 
-    } else if (zstrcmp(zlib_version, ZLIB_VERSION) != 0) {
+    } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
         fprintf(stderr, "warning: different zlib version\n");
     }
-    test_compress();
+
+    compr    = (Byte*)calloc((uInt)comprLen, 1);
+    uncompr  = (Byte*)calloc((uInt)uncomprLen, 1);
+    /* compr and uncompr are cleared to avoid reading uninitialized
+     * data and to ensure that uncompr compresses well.
+     */
+    if (compr == Z_NULL || uncompr == Z_NULL) {
+        printf("out of memory\n");
+	exit(1);
+    }
+    test_compress(compr, comprLen, uncompr, uncomprLen);
 
     test_gzio((argc > 1 ? argv[1] : "foo.gz"),
-              (argc > 2 ? argv[2] : "foo.gz"));
+              (argc > 2 ? argv[2] : "foo.gz"),
+	      uncompr, (int)uncomprLen);
 
-    test_deflate(compr);
+    test_deflate(compr, comprLen);
-    test_inflate(compr);
+    test_inflate(compr, comprLen, uncompr, uncomprLen);
 
-    test_flush(compr);
+    test_large_deflate(compr, comprLen, uncompr, uncomprLen);
-    test_sync(compr);
+    test_large_inflate(compr, comprLen, uncompr, uncomprLen);
+
+    test_flush(compr, comprLen);
+    test_sync(compr, comprLen, uncompr, uncomprLen);
+
+    test_dict_deflate(compr, comprLen);
+    test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
 
     exit(0);
     return 0; /* to avoid warning */

gzio.c

@@ -1,9 +1,11 @@
 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Compile this file with -DNO_DEFLATE to avoid the compression code.
  */
 
-/* $Id: gzio.c,v 1.8 1995/05/03 17:27:09 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 
@@ -16,8 +18,7 @@ struct internal_state {int dummy;}; /* for buggy compilers */
 #define ALLOC(size) malloc(size)
 #define TRYFREE(p) {if (p) free(p);}
 
-#define GZ_MAGIC_1 0x1f
+static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
-#define GZ_MAGIC_2 0x8b
 
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
@@ -27,10 +28,6 @@ struct internal_state {int dummy;}; /* for buggy compilers */
 #define COMMENT      0x10 /* bit 4 set: file comment present */
 #define RESERVED     0xE0 /* bits 5..7: reserved */
 
-#ifndef SEEK_CUR
-#  define SEEK_CUR 1
-#endif
-
 typedef struct gz_stream {
     z_stream stream;
     int      z_err;   /* error code for last stream operation */
@@ -43,47 +40,21 @@ typedef struct gz_stream {
     char     *path;   /* path name for debugging only */
     int      transparent; /* 1 if input file is not a .gz file */
     char     mode;    /* 'w' or 'r' */
+    long     startpos; /* start of compressed data in file (header skipped) */
 } gz_stream;
 
 
+local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
+local int do_flush        OF((gzFile file, int flush));
+local int    get_byte     OF((gz_stream *s));
+local void   check_header OF((gz_stream *s));
 local int    destroy      OF((gz_stream *s));
-local gzFile gz_open OF((char *path, char *mode, int  fd));
 local void   putLong      OF((FILE *file, uLong x));
-local uLong  getLong OF((Bytef *buf));
+local uLong  getLong      OF((gz_stream *s));
-
- /* ===========================================================================
- * Cleanup then free the given gz_stream. Return a zlib error code.
- */
-local int destroy (s)
-    gz_stream *s;
-{
-    int err = Z_OK;
-
-    if (!s) return Z_STREAM_ERROR;
-
-    TRYFREE(s->inbuf);
-    TRYFREE(s->outbuf);
-    TRYFREE(s->path);
-    TRYFREE(s->msg);
-
-    if (s->stream.state != NULL) {
-       if (s->mode == 'w') {
-           err = deflateEnd(&(s->stream));
-       } else if (s->mode == 'r') {
-           err = inflateEnd(&(s->stream));
-       }
-    }
-    if (s->file != NULL && fclose(s->file)) {
-        err = Z_ERRNO;
-    }
-    if (s->z_err < 0) err = s->z_err;
-    TRYFREE(s);
-    return err;
-}
 
 /* ===========================================================================
      Opens a gzip (.gz) file for reading or writing. The mode parameter
-   is as in fopen ("rb" or "wb"). The file is given either by file descritor
+   is as in fopen ("rb" or "wb"). The file is given either by file descriptor
    or path name (if fd == -1).
      gz_open return NULL if the file could not be opened or if there was
    insufficient memory to allocate the (de)compression state; errno
@@ -91,19 +62,26 @@ local int destroy (s)
    zlib error is Z_MEM_ERROR).
 */
 local gzFile gz_open (path, mode, fd)
-    char *path;
+    const char *path;
-    char *mode;
+    const char *mode;
     int  fd;
 {
     int err;
     int level = Z_DEFAULT_COMPRESSION; /* compression level */
-    char *p = mode;
+    int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
-    gz_stream *s = (gz_stream *)ALLOC(sizeof(gz_stream));
+    char *p = (char*)mode;
+    gz_stream *s;
+    char fmode[80]; /* copy of mode, without the compression level */
+    char *m = fmode;
 
+    if (!path || !mode) return Z_NULL;
+
+    s = (gz_stream *)ALLOC(sizeof(gz_stream));
     if (!s) return Z_NULL;
 
     s->stream.zalloc = (alloc_func)0;
     s->stream.zfree = (free_func)0;
+    s->stream.opaque = (voidpf)0;
     s->stream.next_in = s->inbuf = Z_NULL;
     s->stream.next_out = s->outbuf = Z_NULL;
     s->stream.avail_in = s->stream.avail_out = 0;
@@ -123,25 +101,38 @@ local gzFile gz_open (path, mode, fd)
     s->mode = '\0';
     do {
         if (*p == 'r') s->mode = 'r';
-        if (*p == 'w') s->mode = 'w';
+        if (*p == 'w' || *p == 'a') s->mode = 'w';
-        if (*p >= '1' && *p <= '9') level = *p - '0';
+        if (*p >= '0' && *p <= '9') {
-    } while (*p++);
+	    level = *p - '0';
+	} else if (*p == 'f') {
+	  strategy = Z_FILTERED;
+	} else if (*p == 'h') {
+	  strategy = Z_HUFFMAN_ONLY;
+	} else {
+	    *m++ = *p; /* copy the mode */
+	}
+    } while (*p++ && m != fmode + sizeof(fmode));
     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
     
     if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+        err = Z_STREAM_ERROR;
+#else
         err = deflateInit2(&(s->stream), level,
-                           DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
+                           Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
         /* windowBits is passed < 0 to suppress zlib header */
 
         s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
-
+#endif
         if (err != Z_OK || s->outbuf == Z_NULL) {
             return destroy(s), (gzFile)Z_NULL;
         }
     } else {
-        err = inflateInit2(&(s->stream), -MAX_WBITS);
         s->stream.next_in  = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
 
+        err = inflateInit2(&(s->stream), -MAX_WBITS);
+        /* windowBits is passed < 0 to tell that there is no zlib header */
+
         if (err != Z_OK || s->inbuf == Z_NULL) {
             return destroy(s), (gzFile)Z_NULL;
         }
@@ -149,7 +140,7 @@ local gzFile gz_open (path, mode, fd)
     s->stream.avail_out = Z_BUFSIZE;
 
     errno = 0;
-    s->file = fd < 0 ? FOPEN(path, mode) : fdopen(fd, mode);
+    s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
 
     if (s->file == NULL) {
         return destroy(s), (gzFile)Z_NULL;
@@ -157,149 +148,302 @@ local gzFile gz_open (path, mode, fd)
     if (s->mode == 'w') {
         /* Write a very simple .gz header:
          */
-        fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", GZ_MAGIC_1, GZ_MAGIC_2,
+        fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
-               DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+             Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+	s->startpos = ftell(s->file);
     } else {
-        /* Check and skip the header:
+	check_header(s); /* skip the .gz header */
-         */
+	s->startpos = (ftell(s->file) - s->stream.avail_in);
-        Byte c1 = 0, c2 = 0;
+    }
-        Byte method = 0;
-        Byte flags = 0;
-        Byte xflags = 0;
-        Byte time[4];
-        Byte osCode;
-        int c;
     
-        s->stream.avail_in = fread(s->inbuf, 1, 2, s->file);
-        if (s->stream.avail_in != 2 || s->inbuf[0] != GZ_MAGIC_1
-            || s->inbuf[1] != GZ_MAGIC_2) {
-            s->transparent = 1;
-            return (gzFile)s;
-        }
-        s->stream.avail_in = 0;
-        fscanf(s->file,"%c%c%4c%c%c", &method, &flags, time, &xflags, &osCode);
-
-        if (method != DEFLATED || feof(s->file) || (flags & RESERVED) != 0) {
-            s->z_err = Z_DATA_ERROR;
-            return (gzFile)s;
-        }
-        if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
-            long len;
-            fscanf(s->file, "%c%c", &c1, &c2);
-            len = c1 + ((long)c2<<8);
-            fseek(s->file, len, SEEK_CUR);
-        }
-        if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
-            while ((c = getc(s->file)) != 0 && c != EOF) ;
-        }
-        if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
-            while ((c = getc(s->file)) != 0 && c != EOF) ;
-        }
-        if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
-            fscanf(s->file, "%c%c", &c1, &c2);
-        }
-        if (feof(s->file)) {
-            s->z_err = Z_DATA_ERROR;
-        }
-    }
     return (gzFile)s;
 }
 
 /* ===========================================================================
      Opens a gzip (.gz) file for reading or writing.
 */
-gzFile gzopen (path, mode)
+gzFile EXPORT gzopen (path, mode)
-    char *path;
+    const char *path;
-    char *mode;
+    const char *mode;
 {
     return gz_open (path, mode, -1);
 }
 
 /* ===========================================================================
-     Associate a gzFile with the file descriptor fd.
+     Associate a gzFile with the file descriptor fd. fd is not dup'ed here
+   to mimic the behavio(u)r of fdopen.
 */
-gzFile gzdopen (fd, mode)
+gzFile EXPORT gzdopen (fd, mode)
     int fd;
-    char *mode;
+    const char *mode;
 {
     char name[20];
+
+    if (fd < 0) return (gzFile)Z_NULL;
     sprintf(name, "<fd:%d>", fd); /* for debugging */
 
     return gz_open (name, mode, fd);
 }
 
 /* ===========================================================================
-     Reads the given number of uncompressed bytes from the compressed file.
+ * Update the compression level and strategy
-   gzread returns the number of bytes actually read (0 for end of file).
  */
-int gzread (file, buf, len)
+int EXPORT gzsetparams (file, level, strategy)
     gzFile file;
-    voidnp buf;
+    int level;
-    unsigned len;
+    int strategy;
 {
     gz_stream *s = (gz_stream*)file;
 
+    if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
+
+    /* Make room to allow flushing */
+    if (s->stream.avail_out == 0) {
+
+	s->stream.next_out = s->outbuf;
+	if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
+	    s->z_err = Z_ERRNO;
+	}
+	s->stream.avail_out = Z_BUFSIZE;
+    }
+
+    return deflateParams (&(s->stream), level, strategy);
+}
+
+/* ===========================================================================
+     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
+   for end of file.
+   IN assertion: the stream s has been sucessfully opened for reading.
+*/
+local int get_byte(s)
+    gz_stream *s;
+{
+    if (s->z_eof) return EOF;
+    if (s->stream.avail_in == 0) {
+	errno = 0;
+	s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+	if (s->stream.avail_in == 0) {
+	    s->z_eof = 1;
+	    if (ferror(s->file)) s->z_err = Z_ERRNO;
+	    return EOF;
+	}
+	s->stream.next_in = s->inbuf;
+    }
+    s->stream.avail_in--;
+    return *(s->stream.next_in)++;
+}
+
+/* ===========================================================================
+      Check the gzip header of a gz_stream opened for reading. Set the stream
+    mode to transparent if the gzip magic header is not present; set s->err
+    to Z_DATA_ERROR if the magic header is present but the rest of the header
+    is incorrect.
+    IN assertion: the stream s has already been created sucessfully;
+       s->stream.avail_in is zero for the first time, but may be non-zero
+       for concatenated .gz files.
+*/
+local void check_header(s)
+    gz_stream *s;
+{
+    int method; /* method byte */
+    int flags;  /* flags byte */
+    uInt len;
+    int c;
+
+    /* Check the gzip magic header */
+    for (len = 0; len < 2; len++) {
+	c = get_byte(s);
+	if (c != gz_magic[len]) {
+	    if (len != 0) s->stream.avail_in++, s->stream.next_in--;
+	    if (c != EOF) {
+		s->stream.avail_in++, s->stream.next_in--;
+		s->transparent = 1;
+	    }
+	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
+	    return;
+	}
+    }
+    method = get_byte(s);
+    flags = get_byte(s);
+    if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
+	s->z_err = Z_DATA_ERROR;
+	return;
+    }
+
+    /* Discard time, xflags and OS code: */
+    for (len = 0; len < 6; len++) (void)get_byte(s);
+
+    if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
+	len  =  (uInt)get_byte(s);
+	len += ((uInt)get_byte(s))<<8;
+	/* len is garbage if EOF but the loop below will quit anyway */
+	while (len-- != 0 && get_byte(s) != EOF) ;
+    }
+    if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
+	while ((c = get_byte(s)) != 0 && c != EOF) ;
+    }
+    if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
+	while ((c = get_byte(s)) != 0 && c != EOF) ;
+    }
+    if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
+	for (len = 0; len < 2; len++) (void)get_byte(s);
+    }
+    s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
+}
+
+ /* ===========================================================================
+ * Cleanup then free the given gz_stream. Return a zlib error code.
+   Try freeing in the reverse order of allocations.
+ */
+local int destroy (s)
+    gz_stream *s;
+{
+    int err = Z_OK;
+
+    if (!s) return Z_STREAM_ERROR;
+
+    TRYFREE(s->msg);
+
+    if (s->stream.state != NULL) {
+	if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+	    err = Z_STREAM_ERROR;
+#else
+	    err = deflateEnd(&(s->stream));
+#endif
+	} else if (s->mode == 'r') {
+	    err = inflateEnd(&(s->stream));
+	}
+    }
+    if (s->file != NULL && fclose(s->file)) {
+#ifdef ESPIPE
+	if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
+#endif
+	    err = Z_ERRNO;
+    }
+    if (s->z_err < 0) err = s->z_err;
+
+    TRYFREE(s->inbuf);
+    TRYFREE(s->outbuf);
+    TRYFREE(s->path);
+    TRYFREE(s);
+    return err;
+}
+
+/* ===========================================================================
+     Reads the given number of uncompressed bytes from the compressed file.
+   gzread returns the number of bytes actually read (0 for end of file).
+*/
+int EXPORT gzread (file, buf, len)
+    gzFile file;
+    voidp buf;
+    unsigned len;
+{
+    gz_stream *s = (gz_stream*)file;
+    Bytef *start = (Bytef*)buf; /* starting point for crc computation */
+    Byte  *next_out; /* == stream.next_out but not forced far (for MSDOS) */
+
     if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
 
-    if (s->transparent) {
+    if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
-        int n = 0;
+    if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
-        Byte *b = (Byte*)buf;
-        /* Copy the first two (non-magic) bytes if not done already */
-        while (s->stream.avail_in > 0 && len > 0) {
-            *b++ = *s->stream.next_in++;
-            s->stream.avail_in--;
-            len--; n++;
-        }
-        if (len == 0) return n;
-        return n + fread(b, 1, len, s->file);
-    }
-    if (s->z_err == Z_DATA_ERROR) return -1; /* bad .gz file */
-    if (s->z_err == Z_STREAM_END) return 0;  /* don't read crc as data */
 
-    s->stream.next_out = buf;
+    next_out = (Byte*)buf;
+    s->stream.next_out = (Bytef*)buf;
     s->stream.avail_out = len;
 
     while (s->stream.avail_out != 0) {
 
+	if (s->transparent) {
+	    /* Copy first the lookahead bytes: */
+	    uInt n = s->stream.avail_in;
+	    if (n > s->stream.avail_out) n = s->stream.avail_out;
+	    if (n > 0) {
+		zmemcpy(s->stream.next_out, s->stream.next_in, n);
+		next_out += n;
+		s->stream.next_out = next_out;
+		s->stream.next_in   += n;
+		s->stream.avail_out -= n;
+		s->stream.avail_in  -= n;
+	    }
+	    if (s->stream.avail_out > 0) {
+		s->stream.avail_out -= fread(next_out, 1, s->stream.avail_out,
+					     s->file);
+	    }
+	    return (int)(len - s->stream.avail_out);
+	}
         if (s->stream.avail_in == 0 && !s->z_eof) {
 
             errno = 0;
-            s->stream.avail_in =
+            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
-                fread(s->inbuf, 1, Z_BUFSIZE, s->file);
             if (s->stream.avail_in == 0) {
                 s->z_eof = 1;
-            } else if (s->stream.avail_in == (uInt)EOF) {
+		if (ferror(s->file)) {
-                s->stream.avail_in = 0;
-                s->z_eof = 1;
 		    s->z_err = Z_ERRNO;
 		    break;
 		}
+            }
             s->stream.next_in = s->inbuf;
         }
         s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
 
-        if (s->z_err == Z_STREAM_END ||
+	if (s->z_err == Z_STREAM_END) {
-            s->z_err != Z_OK  || s->z_eof) break;
+	    /* Check CRC and original size */
+	    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
+	    start = s->stream.next_out;
+
+	    if (getLong(s) != s->crc || getLong(s) != s->stream.total_out) {
+		s->z_err = Z_DATA_ERROR;
+	    } else {
+		/* Check for concatenated .gz files: */
+		check_header(s);
+		if (s->z_err == Z_OK) {
+		    uLong total_in = s->stream.total_in;
+		    uLong total_out = s->stream.total_out;
+
+		    inflateReset(&(s->stream));
+		    s->stream.total_in = total_in;
+		    s->stream.total_out = total_out;
+		    s->crc = crc32(0L, Z_NULL, 0);
 		}
-    len -= s->stream.avail_out;
+	    }
-    s->crc = crc32(s->crc, buf, len);
+	}
-    return (int)len;
+	if (s->z_err != Z_OK || s->z_eof) break;
+    }
+    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
+
+    return (int)(len - s->stream.avail_out);
 }
 
+
+/* ===========================================================================
+      Reads one byte from the compressed file. gzgetc returns this byte
+   or -1 in case of end of file or error.
+*/
+int EXPORT gzgetc(file)
+    gzFile file;
+{
+    int c;
+
+    return gzread(file, &c, 1) == 1 ? c : -1;
+}
+
+
+#ifndef NO_DEFLATE
 /* ===========================================================================
      Writes the given number of uncompressed bytes into the compressed file.
    gzwrite returns the number of bytes actually written (0 in case of error).
 */
-int gzwrite (file, buf, len)
+int EXPORT gzwrite (file, buf, len)
     gzFile file;
-    voidnp buf;
+    const voidp buf;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
 
-    s->stream.next_in = buf;
+    s->stream.next_in = (Bytef*)buf;
     s->stream.avail_in = len;
 
     while (s->stream.avail_in != 0) {
@@ -316,18 +460,79 @@ int gzwrite (file, buf, len)
         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
         if (s->z_err != Z_OK) break;
     }
-    s->crc = crc32(s->crc, buf, len);
+    s->crc = crc32(s->crc, (const Bytef *)buf, len);
 
     return (int)(len - s->stream.avail_in);
 }
 
+/* ===========================================================================
+     Converts, formats, and writes the args to the compressed file under
+   control of the format string, as in fprintf. gzprintf returns the number of
+   uncompressed bytes actually written (0 in case of error).
+*/
+#ifdef STDC
+#include <stdarg.h>
+
+int EXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
+{
+    char buf[Z_BUFSIZE];
+    va_list va;
+    int len;
+
+    va_start(va, format);
+#ifdef HAS_vsnprintf
+    len = vsnprintf(buf, sizeof(buf), format, va);
+#else
+    len = vsprintf(buf, format, va);
+#endif
+    va_end(va);
+    if (len <= 0) return 0;
+
+    return gzwrite(file, buf, (unsigned)len);
+}
+#else /* not ANSI C */
+
+int EXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+	               a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
+    gzFile file;
+    const char *format;
+    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+	a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
+{
+    char buf[Z_BUFSIZE];
+    int len;
+
+#ifdef HAS_snprintf
+    snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
+	     a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#else
+    sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
+	    a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#endif
+    len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
+    if (len <= 0) return 0;
+
+    return gzwrite(file, buf, len);
+}
+#endif
+
+/* ===========================================================================
+      Writes c, converted to an unsigned char, into the compressed file.
+   gzputc returns the value that was written, or -1 in case of error.
+*/
+int EXPORT gzputc(file, c)
+    gzFile file;
+    int c;
+{
+    return gzwrite(file, &c, 1) == 1 ? c : -1;
+}
+
+
 /* ===========================================================================
      Flushes all pending output into the compressed file. The parameter
    flush is as in the deflate() function.
-     gzflush should be called only when strictly necessary because it can
-   degrade compression.
 */
-int gzflush (file, flush)
+local int do_flush (file, flush)
     gzFile file;
     int flush;
 {
@@ -343,7 +548,7 @@ int gzflush (file, flush)
         len = Z_BUFSIZE - s->stream.avail_out;
 
         if (len != 0) {
-            if (fwrite(s->outbuf, 1, len, s->file) != len) {
+            if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
                 s->z_err = Z_ERRNO;
                 return Z_ERRNO;
             }
@@ -353,6 +558,9 @@ int gzflush (file, flush)
         if (done) break;
         s->z_err = deflate(&(s->stream), flush);
 
+	/* Ignore the second of two consecutive flushes: */
+	if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
+
         /* deflate has finished flushing only when it hasn't used up
          * all the available space in the output buffer: 
          */
@@ -360,9 +568,154 @@ int gzflush (file, flush)
  
         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
+    return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
+}
+
+int EXPORT gzflush (file, flush)
+     gzFile file;
+     int flush;
+{
+    gz_stream *s = (gz_stream*)file;
+    int err = do_flush (file, flush);
+
+    if (err) return err;
     fflush(s->file);
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }
+#endif /* NO_DEFLATE */
+
+/* ===========================================================================
+      Sets the starting position for the next gzread or gzwrite on the given
+   compressed file. The offset represents a number of bytes in the
+      gzseek returns the resulting offset location as measured in bytes from
+   the beginning of the uncompressed stream, or -1 in case of error.
+      SEEK_END is not implemented, returns error.
+      In this version of the library, gzseek can be extremely slow.
+*/
+z_off_t EXPORT gzseek (file, offset, whence)
+    gzFile file;
+    z_off_t offset;
+    int whence;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || whence == SEEK_END || s->z_err == Z_ERRNO) return -1L;
+
+    s->z_err = Z_OK;
+    s->z_eof = 0;
+    
+    if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+	return -1L;
+#else
+	if (whence == SEEK_SET) {
+	    offset -= s->stream.total_out;
+	}
+	if (offset < 0) return -1L;
+
+	/* At this point, offset is the number of zero bytes to write. */
+	if (s->inbuf == Z_NULL) {
+	    s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
+	    zmemzero(s->inbuf, Z_BUFSIZE);
+	}
+	while (offset > 0)  {
+	    uInt size = Z_BUFSIZE;
+	    if (offset < Z_BUFSIZE) size = (uInt)offset;
+
+	    size = gzwrite(file, s->inbuf, size);
+	    if (size == 0) return -1L;
+
+	    offset -= size;
+	}
+	return s->stream.total_in;
+#endif
+    }
+    /* Rest of function is for reading only */
+
+    if (s->z_err == Z_DATA_ERROR) return -1L;
+
+    /* compute absolute position */
+    if (whence == SEEK_CUR) {
+	offset += s->stream.total_out;
+    }
+    if (offset < 0) return -1L;
+
+    if (s->transparent) {
+	/* map to fseek */
+	s->stream.avail_in = 0;
+	s->stream.next_in = s->inbuf;
+	if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
+	return offset;
+    }
+
+    /* For a negative seek, rewind and use positive seek */
+    if ((uLong)offset >= s->stream.total_out) {
+	offset -= s->stream.total_out;
+    } else if (gzrewind(file) < 0) {
+	return -1L;
+    }
+    /* offset is now the number of bytes to skip. */
+
+    if (offset != 0 && s->outbuf == Z_NULL) {
+	s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
+    }
+    while (offset > 0)  {
+	int size = Z_BUFSIZE;
+	if (offset < Z_BUFSIZE) size = (int)offset;
+
+	size = gzread(file, s->outbuf, (uInt)size);
+	if (size <= 0) return -1L;
+	offset -= size;
+    }
+    return s->stream.total_out;
+}
+
+/* ===========================================================================
+     Rewinds input file. 
+*/
+int EXPORT gzrewind (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+    
+    if (s == NULL || s->mode != 'r') return -1;
+
+    s->z_err = Z_OK;
+    s->z_eof = 0;
+    s->stream.avail_in = 0;
+    s->stream.next_in = s->inbuf;
+	
+    if (s->startpos == 0) { /* not a compressed file */
+	rewind(s->file);
+	return 0;
+    }
+
+    (void) inflateReset(&s->stream);
+    return fseek(s->file, s->startpos, SEEK_SET);
+}
+
+/* ===========================================================================
+     Returns the starting position for the next gzread or gzwrite on the
+   given compressed file. This position represents a number of bytes in the
+   uncompressed data stream.
+*/
+z_off_t EXPORT gztell (file)
+    gzFile file;
+{
+    return gzseek(file, 0L, SEEK_CUR);
+}
+
+/* ===========================================================================
+     Returns 1 when EOF has previously been detected reading the given
+   input stream, otherwise zero.
+*/
+int EXPORT gzeof (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+    
+    return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
+}
 
 /* ===========================================================================
    Outputs a long in LSB order to the given file
@@ -379,18 +732,19 @@ local void putLong (file, x)
 }
 
 /* ===========================================================================
-   Reads a long in LSB order from the given buffer
+   Reads a long in LSB order from the given gz_stream. Sets 
 */
-local uLong getLong (buf)
+local uLong getLong (s)
-    Bytef *buf;
+    gz_stream *s;
 {
-    uLong x = 0;
+    uLong x = (uLong)get_byte(s);
-    Bytef *p = buf+4;
+    int c;
 
-    do {
+    x += ((uLong)get_byte(s))<<8;
-        x <<= 8;
+    x += ((uLong)get_byte(s))<<16;
-        x |= *--p; 
+    c = get_byte(s);
-    } while (p != buf);
+    if (c == EOF) s->z_err = Z_DATA_ERROR;
+    x += ((uLong)c)<<24;
     return x;
 }
 
@@ -398,43 +752,26 @@ local uLong getLong (buf)
      Flushes all pending output if necessary, closes the compressed file
    and deallocates all the (de)compression state.
 */
-int gzclose (file)
+int EXPORT gzclose (file)
     gzFile file;
 {
-    uInt n;
     int err;
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
-        err = gzflush (file, Z_FINISH);
+#ifdef NO_DEFLATE
-        if (err != Z_OK) return destroy(file);
+	return Z_STREAM_ERROR;
+#else
+        err = do_flush (file, Z_FINISH);
+        if (err != Z_OK) return destroy((gz_stream*)file);
 
         putLong (s->file, s->crc);
         putLong (s->file, s->stream.total_in);
-
+#endif
-    } else if (s->mode == 'r' && s->z_err == Z_STREAM_END) {
-
-        /* slide CRC and original size if they are at the end of inbuf */
-        if ((n = s->stream.avail_in) < 8  && !s->z_eof) {
-            Byte *p = s->inbuf;
-	    Bytef *q = s->stream.next_in;
-            while (n--) { *p++ = *q++; };
-
-            n = s->stream.avail_in;
-            n += fread(p, 1, 8, s->file);
-            s->stream.next_in = s->inbuf;
     }
-        /* check CRC and original size */
+    return destroy((gz_stream*)file);
-        if (n < 8 ||
-            getLong(s->stream.next_in) != s->crc ||
-            getLong(s->stream.next_in + 4) != s->stream.total_out) {
-
-            s->z_err = Z_DATA_ERROR;
-        }
-    }
-    return destroy(file);
 }
 
 /* ===========================================================================
@@ -444,7 +781,7 @@ int gzclose (file)
    errnum is set to Z_ERRNO and the application may consult errno
    to get the exact error code.
 */
-char*  gzerror (file, errnum)
+const char*  EXPORT gzerror (file, errnum)
     gzFile file;
     int *errnum;
 {
@@ -453,19 +790,19 @@ char*  gzerror (file, errnum)
 
     if (s == NULL) {
         *errnum = Z_STREAM_ERROR;
-        return z_errmsg[1-Z_STREAM_ERROR];
+        return (const char*)ERR_MSG(Z_STREAM_ERROR);
     }
     *errnum = s->z_err;
-    if (*errnum == Z_OK) return "";
+    if (*errnum == Z_OK) return (const char*)"";
 
-    m =  *errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg;
+    m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
 
-    if (m == NULL || *m == '\0') m = z_errmsg[1-s->z_err];
+    if (m == NULL || *m == '\0') m = (char*)ERR_MSG(s->z_err);
 
     TRYFREE(s->msg);
     s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);
     strcpy(s->msg, s->path);
     strcat(s->msg, ": ");
     strcat(s->msg, m);
-    return s->msg;
+    return (const char*)s->msg;
 }

infblock.c

@@ -1,5 +1,5 @@
 /* infblock.c -- interpret and process block types to last block
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -12,7 +12,7 @@
 struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 
 /* Table for deflate from PKZIP's appnote.txt. */
-local uInt border[] = { /* Order of the bit length code lengths */
+local const uInt border[] = { /* Order of the bit length code lengths */
         16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
 
 /*
@@ -63,10 +63,10 @@ local uInt border[] = { /* Order of the bit length code lengths */
 
 void inflate_blocks_reset(s, z, c)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 uLongf *c;
 {
-  if (s->checkfn != Z_NULL)
+  if (c != Z_NULL)
     *c = s->check;
   if (s->mode == BTREE || s->mode == DTREE)
     ZFREE(z, s->sub.trees.blens);
@@ -81,13 +81,13 @@ uLongf *c;
   s->bitb = 0;
   s->read = s->write = s->window;
   if (s->checkfn != Z_NULL)
-    s->check = (*s->checkfn)(0L, Z_NULL, 0);
+    z->adler = s->check = (*s->checkfn)(0L, (const Bytef *)Z_NULL, 0);
   Trace((stderr, "inflate:   blocks reset\n"));
 }
 
 
 inflate_blocks_statef *inflate_blocks_new(z, c, w)
-z_stream *z;
+z_streamp z;
 check_func c;
 uInt w;
 {
@@ -105,14 +105,17 @@ uInt w;
   s->checkfn = c;
   s->mode = TYPE;
   Trace((stderr, "inflate:   blocks allocated\n"));
-  inflate_blocks_reset(s, z, &s->check);
+  inflate_blocks_reset(s, z, Z_NULL);
   return s;
 }
 
 
+#ifdef DEBUG
+  extern uInt inflate_hufts;
+#endif
 int inflate_blocks(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
   uInt t;               /* temporary storage */
@@ -172,24 +175,24 @@ int r;
         case 3:                         /* illegal */
           DUMPBITS(3)
           s->mode = BAD;
-          z->msg = "invalid block type";
+          z->msg = (char*)"invalid block type";
           r = Z_DATA_ERROR;
           LEAVE
       }
       break;
     case LENS:
       NEEDBITS(32)
-      if (((~b) >> 16) != (b & 0xffff))
+      if ((((~b) >> 16) & 0xffff) != (b & 0xffff))
       {
         s->mode = BAD;
-        z->msg = "invalid stored block lengths";
+        z->msg = (char*)"invalid stored block lengths";
         r = Z_DATA_ERROR;
         LEAVE
       }
       s->sub.left = (uInt)b & 0xffff;
       b = k = 0;                      /* dump bits */
       Tracev((stderr, "inflate:       stored length %u\n", s->sub.left));
-      s->mode = s->sub.left ? STORED : TYPE;
+      s->mode = s->sub.left ? STORED : (s->last ? DRY : TYPE);
       break;
     case STORED:
       if (n == 0)
@@ -215,14 +218,12 @@ int r;
       if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
       {
         s->mode = BAD;
-        z->msg = "too many length or distance symbols";
+        z->msg = (char*)"too many length or distance symbols";
         r = Z_DATA_ERROR;
         LEAVE
       }
 #endif
       t = 258 + (t & 0x1f) + ((t >> 5) & 0x1f);
-      if (t < 19)
-        t = 19;
       if ((s->sub.trees.blens = (uIntf*)ZALLOC(z, t, sizeof(uInt))) == Z_NULL)
       {
         r = Z_MEM_ERROR;
@@ -246,6 +247,7 @@ int r;
                              &s->sub.trees.tb, z);
       if (t != Z_OK)
       {
+        ZFREE(z, s->sub.trees.blens);
         r = t;
         if (r == Z_DATA_ERROR)
           s->mode = BAD;
@@ -284,8 +286,10 @@ int r;
           if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
               (c == 16 && i < 1))
           {
+            inflate_trees_free(s->sub.trees.tb, z);
+            ZFREE(z, s->sub.trees.blens);
             s->mode = BAD;
-            z->msg = "invalid bit length repeat";
+            z->msg = (char*)"invalid bit length repeat";
             r = Z_DATA_ERROR;
             LEAVE
           }
@@ -306,8 +310,12 @@ int r;
         bl = 9;         /* must be <= 9 for lookahead assumptions */
         bd = 6;         /* must be <= 9 for lookahead assumptions */
         t = s->sub.trees.table;
+#ifdef DEBUG
+      inflate_hufts = 0;
+#endif
         t = inflate_trees_dynamic(257 + (t & 0x1f), 1 + ((t >> 5) & 0x1f),
                                   s->sub.trees.blens, &bl, &bd, &tl, &td, z);
+        ZFREE(z, s->sub.trees.blens);
         if (t != Z_OK)
         {
           if (t == (uInt)Z_DATA_ERROR)
@@ -315,7 +323,8 @@ int r;
           r = t;
           LEAVE
         }
-        Tracev((stderr, "inflate:       trees ok\n"));
+        Tracev((stderr, "inflate:       trees ok, %d * %d bytes used\n",
+              inflate_hufts, sizeof(inflate_huft)));
         if ((c = inflate_codes_new(bl, bd, tl, td, z)) == Z_NULL)
         {
           inflate_trees_free(td, z);
@@ -323,7 +332,6 @@ int r;
           r = Z_MEM_ERROR;
           LEAVE
         }
-        ZFREE(z, s->sub.trees.blens);
         s->sub.decode.codes = c;
         s->sub.decode.tl = tl;
         s->sub.decode.td = td;
@@ -372,14 +380,34 @@ int r;
 }
 
 
-int inflate_blocks_free(s, z, c)
+int inflate_blocks_free(s, z)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
-uLongf *c;
 {
-  inflate_blocks_reset(s, z, c);
+  inflate_blocks_reset(s, z, Z_NULL);
   ZFREE(z, s->window);
   ZFREE(z, s);
   Trace((stderr, "inflate:   blocks freed\n"));
   return Z_OK;
 }
+
+
+void inflate_set_dictionary(s, d, n)
+inflate_blocks_statef *s;
+const Bytef *d;
+uInt  n;
+{
+  zmemcpy((charf *)s->window, d, n);
+  s->read = s->write = s->window + n;
+}
+
+
+/* Returns true if inflate is currently at the end of a block generated
+ * by Z_SYNC_FLUSH or Z_FULL_FLUSH. 
+ * IN assertion: s != Z_NULL
+ */
+int inflate_blocks_sync_point(s)
+inflate_blocks_statef *s;
+{
+  return s->mode == LENS;
+}

infblock.h

@@ -1,5 +1,5 @@
 /* infblock.h -- header to use infblock.c
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -12,21 +12,28 @@ struct inflate_blocks_state;
 typedef struct inflate_blocks_state FAR inflate_blocks_statef;
 
 extern inflate_blocks_statef * inflate_blocks_new OF((
-    z_stream *z,
+    z_streamp z,
     check_func c,               /* check function */
     uInt w));                   /* window size */
 
 extern int inflate_blocks OF((
     inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
     int));                      /* initial return code */
 
 extern void inflate_blocks_reset OF((
     inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
     uLongf *));                  /* check value on output */
 
 extern int inflate_blocks_free OF((
     inflate_blocks_statef *,
-    z_stream *,
+    z_streamp));
-    uLongf *));                  /* check value on output */
+
+extern void inflate_set_dictionary OF((
+    inflate_blocks_statef *s,
+    const Bytef *d,  /* dictionary */
+    uInt  n));       /* dictionary length */
+
+extern int inflate_blocks_sync_point OF((
+    inflate_blocks_statef *s));

infcodes.c

@@ -1,5 +1,5 @@
 /* infcodes.c -- process literals and length/distance pairs
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -16,11 +16,7 @@
 #define exop word.what.Exop
 #define bits word.what.Bits
 
-/* inflate codes private state */
+typedef enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
-struct inflate_codes_state {
-
-  /* mode */
-  enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
       START,    /* x: set up for LEN */
       LEN,      /* i: get length/literal/eob next */
       LENEXT,   /* i: getting length extra (have base) */
@@ -31,7 +27,13 @@ struct inflate_codes_state {
       WASH,     /* o: got eob, possibly still output waiting */
       END,      /* x: got eob and all data flushed */
       BADCODE}  /* x: got error */
-    mode;               /* current inflate_codes mode */
+inflate_codes_mode;
+
+/* inflate codes private state */
+struct inflate_codes_state {
+
+  /* mode */
+  inflate_codes_mode mode;      /* current inflate_codes mode */
 
   /* mode dependent information */
   uInt len;
@@ -58,8 +60,9 @@ struct inflate_codes_state {
 
 inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
 uInt bl, bd;
-inflate_huft *tl, *td;
+inflate_huft *tl;
-z_stream *z;
+inflate_huft *td; /* need separate declaration for Borland C++ */
+z_streamp z;
 {
   inflate_codes_statef *c;
 
@@ -79,7 +82,7 @@ z_stream *z;
 
 int inflate_codes(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
   uInt j;               /* temporary storage */
@@ -152,7 +155,7 @@ int r;
         break;
       }
       c->mode = BADCODE;        /* invalid code */
-      z->msg = "invalid literal/length code";
+      z->msg = (char*)"invalid literal/length code";
       r = Z_DATA_ERROR;
       LEAVE
     case LENEXT:        /* i: getting length extra (have base) */
@@ -184,7 +187,7 @@ int r;
         break;
       }
       c->mode = BADCODE;        /* invalid code */
-      z->msg = "invalid distance code";
+      z->msg = (char*)"invalid distance code";
       r = Z_DATA_ERROR;
       LEAVE
     case DISTEXT:       /* i: getting distance extra */
@@ -202,7 +205,7 @@ int r;
 #else
       f = q - c->sub.copy.dist;
       if ((uInt)(q - s->window) < c->sub.copy.dist)
-        f = s->end - (c->sub.copy.dist - (q - s->window));
+        f = s->end - (c->sub.copy.dist - (uInt)(q - s->window));
 #endif
       while (c->len)
       {
@@ -234,12 +237,15 @@ int r;
       r = Z_STREAM_ERROR;
       LEAVE
   }
+#ifdef NEED_DUMMY_RETURN
+  return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
+#endif
 }
 
 
 void inflate_codes_free(c, z)
 inflate_codes_statef *c;
-z_stream *z;
+z_streamp z;
 {
   ZFREE(z, c);
   Tracev((stderr, "inflate:       codes free\n"));

infcodes.h

@@ -1,5 +1,5 @@
 /* infcodes.h -- header to use infcodes.c
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -14,14 +14,14 @@ typedef struct inflate_codes_state FAR inflate_codes_statef;
 extern inflate_codes_statef *inflate_codes_new OF((
     uInt, uInt,
     inflate_huft *, inflate_huft *,
-    z_stream *));
+    z_streamp ));
 
 extern int inflate_codes OF((
     inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
     int));
 
 extern void inflate_codes_free OF((
     inflate_codes_statef *,
-    z_stream *));
+    z_streamp ));
 

inffast.c

@@ -1,5 +1,5 @@
 /* inffast.c -- process literals and length/distance pairs fast
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -29,9 +29,10 @@ struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 
 int inflate_fast(bl, bd, tl, td, s, z)
 uInt bl, bd;
-inflate_huft *tl, *td;
+inflate_huft *tl;
+inflate_huft *td; /* need separate declaration for Borland C++ */
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 {
   inflate_huft *t;      /* temporary pointer */
   uInt e;               /* extra bits or operation */
@@ -102,7 +103,7 @@ z_stream *z;
             }
             else                        /* else offset after destination */
             {
-              e = d - (q - s->window);  /* bytes from offset to end */
+              e = d - (uInt)(q - s->window); /* bytes from offset to end */
               r = s->end - e;           /* pointer to offset */
               if (c > e)                /* if source crosses, */
               {
@@ -122,7 +123,7 @@ z_stream *z;
             e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop;
           else
           {
-            z->msg = "invalid distance code";
+            z->msg = (char*)"invalid distance code";
             UNGRAB
             UPDATE
             return Z_DATA_ERROR;
@@ -152,7 +153,7 @@ z_stream *z;
       }
       else
       {
-        z->msg = "invalid literal/length code";
+        z->msg = (char*)"invalid literal/length code";
         UNGRAB
         UPDATE
         return Z_DATA_ERROR;

inffast.h

@@ -1,5 +1,5 @@
 /* inffast.h -- header to use inffast.c
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -14,4 +14,4 @@ extern int inflate_fast OF((
     inflate_huft *,
     inflate_huft *,
     inflate_blocks_statef *,
-    z_stream *));
+    z_streamp ));

inflate.c

@@ -1,5 +1,5 @@
 /* inflate.c -- zlib interface to inflate modules
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,13 +8,14 @@
 
 struct inflate_blocks_state {int dummy;}; /* for buggy compilers */
 
-/* inflate private state */
+typedef enum {
-struct internal_state {
-
-  /* mode */
-  enum {
       METHOD,   /* waiting for method byte */
       FLAG,     /* waiting for flag byte */
+      DICT4,    /* four dictionary check bytes to go */
+      DICT3,    /* three dictionary check bytes to go */
+      DICT2,    /* two dictionary check bytes to go */
+      DICT1,    /* one dictionary check byte to go */
+      DICT0,    /* waiting for inflateSetDictionary */
       BLOCKS,   /* decompressing blocks */
       CHECK4,   /* four check bytes to go */
       CHECK3,   /* three check bytes to go */
@@ -22,7 +23,13 @@ struct internal_state {
       CHECK1,   /* one check byte to go */
       DONE,     /* finished check, done */
       BAD}      /* got an error--stay here */
-    mode;               /* current inflate mode */
+inflate_mode;
+
+/* inflate private state */
+struct internal_state {
+
+  /* mode */
+  inflate_mode  mode;   /* current inflate mode */
 
   /* mode dependent information */
   union {
@@ -43,46 +50,53 @@ struct internal_state {
 };
 
 
-int inflateReset(z)
+int EXPORT inflateReset(z)
-z_stream *z;
+z_streamp z;
 {
-  uLong c;
-
   if (z == Z_NULL || z->state == Z_NULL)
     return Z_STREAM_ERROR;
   z->total_in = z->total_out = 0;
   z->msg = Z_NULL;
   z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
-  inflate_blocks_reset(z->state->blocks, z, &c);
+  inflate_blocks_reset(z->state->blocks, z, Z_NULL);
-  Trace((stderr, "inflate: reset\n"));
+  Tracev((stderr, "inflate: reset\n"));
   return Z_OK;
 }
 
 
-int inflateEnd(z)
+int EXPORT inflateEnd(z)
-z_stream *z;
+z_streamp z;
 {
-  uLong c;
-
   if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
     return Z_STREAM_ERROR;
   if (z->state->blocks != Z_NULL)
-    inflate_blocks_free(z->state->blocks, z, &c);
+    inflate_blocks_free(z->state->blocks, z);
   ZFREE(z, z->state);
   z->state = Z_NULL;
-  Trace((stderr, "inflate: end\n"));
+  Tracev((stderr, "inflate: end\n"));
   return Z_OK;
 }
 
 
-int inflateInit2(z, w)
+int EXPORT inflateInit2_(z, w, version, stream_size)
-z_stream *z;
+z_streamp z;
 int w;
+const char *version;
+int stream_size;
 {
+  if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+      stream_size != sizeof(z_stream))
+      return Z_VERSION_ERROR;
+
   /* initialize state */
   if (z == Z_NULL)
     return Z_STREAM_ERROR;
-  if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
+  z->msg = Z_NULL;
+  if (z->zalloc == Z_NULL)
+  {
+    z->zalloc = zcalloc;
+    z->opaque = (voidpf)0;
+  }
   if (z->zfree == Z_NULL) z->zfree = zcfree;
   if ((z->state = (struct internal_state FAR *)
        ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
@@ -107,13 +121,13 @@ int w;
 
   /* create inflate_blocks state */
   if ((z->state->blocks =
-       inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, 1 << w))
+      inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
       == Z_NULL)
   {
     inflateEnd(z);
     return Z_MEM_ERROR;
   }
-  Trace((stderr, "inflate: allocated\n"));
+  Tracev((stderr, "inflate: allocated\n"));
 
   /* reset state */
   inflateReset(z);
@@ -121,63 +135,87 @@ int w;
 }
 
 
-int inflateInit(z)
+int EXPORT inflateInit_(z, version, stream_size)
-z_stream *z;
+z_streamp z;
+const char *version;
+int stream_size;
 {
-  return inflateInit2(z, DEF_WBITS);
+  return inflateInit2_(z, DEF_WBITS, version, stream_size);
 }
 
 
-#define NEEDBYTE {if(z->avail_in==0)return r;r=Z_OK;}
+#define NEEDBYTE {if(z->avail_in==0)return r; if (f != Z_FINISH) r = Z_OK;}
 #define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
 
-int inflate(z, f)
+int EXPORT inflate(z, f)
-z_stream *z;
+z_streamp z;
 int f;
 {
-  int r = f;    /* to avoid warning about unused f */
+  int r;
   uInt b;
 
-  if (z == Z_NULL || z->next_in == Z_NULL)
+  if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL || f < 0)
     return Z_STREAM_ERROR;
   r = Z_BUF_ERROR;
   while (1) switch (z->state->mode)
   {
     case METHOD:
       NEEDBYTE
-      if (((z->state->sub.method = NEXTBYTE) & 0xf) != DEFLATED)
+      if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
       {
         z->state->mode = BAD;
-        z->msg = "unknown compression method";
+        z->msg = (char*)"unknown compression method";
         z->state->sub.marker = 5;       /* can't try inflateSync */
         break;
       }
       if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
       {
         z->state->mode = BAD;
-        z->msg = "invalid window size";
+        z->msg = (char*)"invalid window size";
         z->state->sub.marker = 5;       /* can't try inflateSync */
         break;
       }
       z->state->mode = FLAG;
     case FLAG:
       NEEDBYTE
-      if ((b = NEXTBYTE) & 0x20)
+      b = NEXTBYTE;
-      {
-        z->state->mode = BAD;
-        z->msg = "invalid reserved bit";
-        z->state->sub.marker = 5;       /* can't try inflateSync */
-        break;
-      }
       if (((z->state->sub.method << 8) + b) % 31)
       {
         z->state->mode = BAD;
-        z->msg = "incorrect header check";
+        z->msg = (char*)"incorrect header check";
         z->state->sub.marker = 5;       /* can't try inflateSync */
         break;
       }
-      Trace((stderr, "inflate: zlib header ok\n"));
+      Tracev((stderr, "inflate: zlib header ok\n"));
+      if (!(b & PRESET_DICT))
+      {
         z->state->mode = BLOCKS;
+	break;
+      }
+      z->state->mode = DICT4;
+    case DICT4:
+      NEEDBYTE
+      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
+      z->state->mode = DICT3;
+    case DICT3:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
+      z->state->mode = DICT2;
+    case DICT2:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
+      z->state->mode = DICT1;
+    case DICT1:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE;
+      z->adler = z->state->sub.check.need;
+      z->state->mode = DICT0;
+      return Z_NEED_DICT;
+    case DICT0:
+      z->state->mode = BAD;
+      z->msg = (char*)"need dictionary";
+      z->state->sub.marker = 0;       /* can try inflateSync */
+      return Z_STREAM_ERROR;
     case BLOCKS:
       r = inflate_blocks(z->state->blocks, z, r);
       if (r == Z_DATA_ERROR)
@@ -187,7 +225,7 @@ int f;
         break;
       }
       if (r != Z_STREAM_END)
-        return r;
+        return f == Z_FINISH && r == Z_OK ? Z_BUF_ERROR : r;
       r = Z_OK;
       inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
       if (z->state->nowrap)
@@ -196,6 +234,7 @@ int f;
         break;
       }
       z->state->mode = CHECK4;
+      if (f == Z_FINISH) r = Z_BUF_ERROR;
     case CHECK4:
       NEEDBYTE
       z->state->sub.check.need = (uLong)NEXTBYTE << 24;
@@ -215,11 +254,11 @@ int f;
       if (z->state->sub.check.was != z->state->sub.check.need)
       {
         z->state->mode = BAD;
-        z->msg = "incorrect data check";
+        z->msg = (char*)"incorrect data check";
         z->state->sub.marker = 5;       /* can't try inflateSync */
         break;
       }
-      Trace((stderr, "inflate: zlib check ok\n"));
+      Tracev((stderr, "inflate: zlib check ok\n"));
       z->state->mode = DONE;
     case DONE:
       return Z_STREAM_END;
@@ -228,11 +267,38 @@ int f;
     default:
       return Z_STREAM_ERROR;
   }
+#ifdef NEED_DUMMY_RETURN
+  return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
+#endif
 }
 
 
-int inflateSync(z)
+int EXPORT inflateSetDictionary(z, dictionary, dictLength)
-z_stream *z;
+z_streamp z;
+const Bytef *dictionary;
+uInt  dictLength;
+{
+  uInt length = dictLength;
+
+  if (z == Z_NULL || z->state == Z_NULL || z->state->mode != DICT0)
+    return Z_STREAM_ERROR;
+
+  if (adler32(1L, dictionary, dictLength) != z->adler) return Z_DATA_ERROR;
+  z->adler = 1L;
+
+  if (length >= ((uInt)1<<z->state->wbits))
+  {
+    length = (1<<z->state->wbits)-1;
+    dictionary += dictLength - length;
+  }
+  inflate_set_dictionary(z->state->blocks, dictionary, length);
+  z->state->mode = BLOCKS;
+  return Z_OK;
+}
+
+
+int EXPORT inflateSync(z)
+z_streamp z;
 {
   uInt n;       /* number of bytes to look at */
   Bytef *p;     /* pointer to bytes */
@@ -279,3 +345,19 @@ z_stream *z;
   z->state->mode = BLOCKS;
   return Z_OK;
 }
+
+
+/* Returns true if inflate is currently at the end of a block generated
+ * by Z_SYNC_FLUSH or Z_FULL_FLUSH. This function is used by one PPP
+ * implementation to provide an additional safety check. PPP uses Z_SYNC_FLUSH
+ * but removes the length bytes of the resulting empty stored block. When
+ * decompressing, PPP checks that at the end of input packet, inflate is
+ * waiting for these length bytes.
+ */
+int EXPORT inflateSyncPoint(z)
+z_streamp z;
+{
+  if (z == Z_NULL || z->state == Z_NULL || z->state->blocks == Z_NULL)
+    return Z_STREAM_ERROR;
+  return inflate_blocks_sync_point(z->state->blocks);
+}

inftrees.c

@@ -1,11 +1,19 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
 #include "zutil.h"
 #include "inftrees.h"
 
+const char inflate_copyright[] =
+   " inflate 1.0.7 Copyright 1995-1998 Mark Adler ";
+/*
+  If you use the zlib library in a product, an acknowledgment is welcome
+  in the documentation of your product. If for some reason you cannot
+  include such an acknowledgment, I would appreciate that you keep this
+  copyright string in the executable of your product.
+ */
 struct internal_state  {int dummy;}; /* for buggy compilers */
 
 /* simplify the use of the inflate_huft type with some defines */
@@ -19,34 +27,30 @@ local int huft_build OF((
     uIntf *,            /* code lengths in bits */
     uInt,               /* number of codes */
     uInt,               /* number of "simple" codes */
-    uIntf *,            /* list of base values for non-simple codes */
+    const uIntf *,      /* list of base values for non-simple codes */
-    uIntf *,            /* list of extra bits for non-simple codes */
+    const uIntf *,      /* list of extra bits for non-simple codes */
     inflate_huft * FAR*,/* result: starting table */
     uIntf *,            /* maximum lookup bits (returns actual) */
-    z_stream *));       /* for zalloc function */
+    z_streamp ));       /* for zalloc function */
 
-local voidp falloc OF((
+local voidpf falloc OF((
-    voidp,              /* opaque pointer (not used) */
+    voidpf,             /* opaque pointer (not used) */
     uInt,               /* number of items */
     uInt));             /* size of item */
 
-local void ffree OF((
-    voidp q,            /* opaque pointer (not used) */
-    voidp p));          /* what to free (not used) */
-
 /* Tables for deflate from PKZIP's appnote.txt. */
-local uInt cplens[] = { /* Copy lengths for literal codes 257..285 */
+local const uInt cplens[31] = { /* Copy lengths for literal codes 257..285 */
         3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
         35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
-        /* actually lengths - 2; also see note #13 above about 258 */
+        /* see note #13 above about 258 */
-local uInt cplext[] = { /* Extra bits for literal codes 257..285 */
+local const uInt cplext[31] = { /* Extra bits for literal codes 257..285 */
         0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
-        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 192, 192}; /* 192==invalid */
+        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 112, 112}; /* 112==invalid */
-local uInt cpdist[] = { /* Copy offsets for distance codes 0..29 */
+local const uInt cpdist[30] = { /* Copy offsets for distance codes 0..29 */
         1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
         257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
         8193, 12289, 16385, 24577};
-local uInt cpdext[] = { /* Extra bits for distance codes */
+local const uInt cpdext[30] = { /* Extra bits for distance codes */
         0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
         7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
         12, 12, 13, 13};
@@ -96,16 +100,16 @@ local int huft_build(b, n, s, d, e, t, m, zs)
 uIntf *b;               /* code lengths in bits (all assumed <= BMAX) */
 uInt n;                 /* number of codes (assumed <= N_MAX) */
 uInt s;                 /* number of simple-valued codes (0..s-1) */
-uIntf *d;               /* list of base values for non-simple codes */
+const uIntf *d;         /* list of base values for non-simple codes */
-uIntf *e;               /* list of extra bits for non-simple codes */  
+const uIntf *e;         /* list of extra bits for non-simple codes */
 inflate_huft * FAR *t;  /* result: starting table */
 uIntf *m;               /* maximum lookup bits, returns actual */
-z_stream *zs;           /* for zalloc function */
+z_streamp zs;           /* for zalloc function */
 /* Given a list of code lengths and a maximum table size, make a set of
    tables to decode that set of codes.  Return Z_OK on success, Z_BUF_ERROR
    if the given code set is incomplete (the tables are still built in this
-   case), Z_DATA_ERROR if the input is invalid (all zero length codes or an
+   case), Z_DATA_ERROR if the input is invalid (an over-subscribed set of
-   over-subscribed set of lengths), or Z_MEM_ERROR if not enough memory. */
+   lengths), or Z_MEM_ERROR if not enough memory. */
 {
 
   uInt a;                       /* counter for codes of length k */
@@ -187,6 +191,7 @@ z_stream *zs;           /* for zalloc function */
     if ((j = *p++) != 0)
       v[x[j]++] = i;
   } while (++i < n);
+  n = x[g];                     /* set n to length of v */
 
 
   /* Generate the Huffman codes and for each, make the table entries */
@@ -212,7 +217,8 @@ z_stream *zs;           /* for zalloc function */
         w += l;                 /* previous table always l bits */
 
         /* compute minimum size table less than or equal to l bits */
-        z = (z = g - w) > (uInt)l ? l : z;      /* table size upper limit */
+        z = g - w;
+        z = z > (uInt)l ? l : z;        /* table size upper limit */
         if ((f = 1 << (j = k - w)) > a + 1)     /* try a k-w bit table */
         {                       /* too few codes for k-w bit table */
           f -= a + 1;           /* deduct codes from patterns left */
@@ -265,7 +271,7 @@ z_stream *zs;           /* for zalloc function */
       }
       else
       {
-        r.exop = (Byte)e[*p - s] + 16 + 64; /* non-simple--look up in lists */
+        r.exop = (Byte)(e[*p - s] + 16 + 64);/* non-simple--look up in lists */
         r.base = d[*p++ - s];
       }
 
@@ -298,17 +304,17 @@ int inflate_trees_bits(c, bb, tb, z)
 uIntf *c;               /* 19 code lengths */
 uIntf *bb;              /* bits tree desired/actual depth */
 inflate_huft * FAR *tb; /* bits tree result */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 {
   int r;
 
   r = huft_build(c, 19, 19, (uIntf*)Z_NULL, (uIntf*)Z_NULL, tb, bb, z);
   if (r == Z_DATA_ERROR)
-    z->msg = "oversubscribed dynamic bit lengths tree";
+    z->msg = (char*)"oversubscribed dynamic bit lengths tree";
-  else if (r == Z_BUF_ERROR)
+  else if (r == Z_BUF_ERROR || *bb == 0)
   {
     inflate_trees_free(*tb, z);
-    z->msg = "incomplete dynamic bit lengths tree";
+    z->msg = (char*)"incomplete dynamic bit lengths tree";
     r = Z_DATA_ERROR;
   }
   return r;
@@ -323,36 +329,43 @@ uIntf *bl;              /* literal desired/actual bit depth */
 uIntf *bd;              /* distance desired/actual bit depth */
 inflate_huft * FAR *tl; /* literal/length tree result */
 inflate_huft * FAR *td; /* distance tree result */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 {
   int r;
 
   /* build literal/length tree */
-  if ((r = huft_build(c, nl, 257, cplens, cplext, tl, bl, z)) != Z_OK)
+  r = huft_build(c, nl, 257, cplens, cplext, tl, bl, z);
+  if (r != Z_OK || *bl == 0)
   {
     if (r == Z_DATA_ERROR)
-      z->msg = "oversubscribed literal/length tree";
+      z->msg = (char*)"oversubscribed literal/length tree";
-    else if (r == Z_BUF_ERROR)
+    else if (r != Z_MEM_ERROR)
     {
       inflate_trees_free(*tl, z);
-      z->msg = "incomplete literal/length tree";
+      z->msg = (char*)"incomplete literal/length tree";
       r = Z_DATA_ERROR;
     }
     return r;
   }
 
   /* build distance tree */
-  if ((r = huft_build(c + nl, nd, 0, cpdist, cpdext, td, bd, z)) != Z_OK)
+  r = huft_build(c + nl, nd, 0, cpdist, cpdext, td, bd, z);
+  if (r != Z_OK || (*bd == 0 && nl > 257))
   {
     if (r == Z_DATA_ERROR)
-      z->msg = "oversubscribed literal/length tree";
+      z->msg = (char*)"oversubscribed distance tree";
     else if (r == Z_BUF_ERROR) {
 #ifdef PKZIP_BUG_WORKAROUND
       r = Z_OK;
     }
 #else
       inflate_trees_free(*td, z);
-      z->msg = "incomplete literal/length tree";
+      z->msg = (char*)"incomplete distance tree";
+      r = Z_DATA_ERROR;
+    }
+    else if (r != Z_MEM_ERROR)
+    {
+      z->msg = (char*)"empty distance tree with lengths";
       r = Z_DATA_ERROR;
     }
     inflate_trees_free(*tl, z);
@@ -366,10 +379,8 @@ z_stream *z;            /* for zfree function */
 
 
 /* build fixed tables only once--keep them here */
-local int fixed_lock = 0;
 local int fixed_built = 0;
 #define FIXEDH 530      /* number of hufts used by fixed tables */
-local uInt fixed_left = FIXEDH;
 local inflate_huft fixed_mem[FIXEDH];
 local uInt fixed_bl;
 local uInt fixed_bd;
@@ -377,25 +388,15 @@ local inflate_huft *fixed_tl;
 local inflate_huft *fixed_td;
 
 
-local voidp falloc(q, n, s)
+local voidpf falloc(q, n, s)
-voidp q;        /* opaque pointer (not used) */
+voidpf q;       /* opaque pointer */
 uInt n;         /* number of items */
 uInt s;         /* size of item */
 {
-  Assert(s == sizeof(inflate_huft) && n <= fixed_left,
+  Assert(s == sizeof(inflate_huft) && n <= *(intf *)q,
          "inflate_trees falloc overflow");
-  if (q) s++; /* to make some compilers happy */
+  *(intf *)q -= n+s-s; /* s-s to avoid warning */
-  fixed_left -= n;
+  return (voidpf)(fixed_mem + *(intf *)q);
-  return (voidp)(fixed_mem + fixed_left);
-}
-
-
-local void ffree(q, p)
-voidp q;
-voidp p;
-{
-  Assert(0, "inflate_trees ffree called!");
-  if (q) q = p; /* to make some compilers happy */
 }
 
 
@@ -405,19 +406,18 @@ uIntf *bd;               /* distance desired/actual bit depth */
 inflate_huft * FAR *tl;  /* literal/length tree result */
 inflate_huft * FAR *td;  /* distance tree result */
 {
-  /* build fixed tables if not built already--lock out other instances */
+  /* build fixed tables if not already (multiple overlapped executions ok) */
-  while (++fixed_lock > 1)
-    fixed_lock--;
   if (!fixed_built)
   {
     int k;              /* temporary variable */
     unsigned c[288];    /* length list for huft_build */
     z_stream z;         /* for falloc function */
+    int f = FIXEDH;     /* number of hufts left in fixed_mem */
 
     /* set up fake z_stream for memory routines */
     z.zalloc = falloc;
-    z.zfree = ffree;
+    z.zfree = Z_NULL;
-    z.opaque = Z_NULL;
+    z.opaque = (voidpf)&f;
 
     /* literal table */
     for (k = 0; k < 144; k++)
@@ -438,9 +438,9 @@ inflate_huft * FAR *td;  /* distance tree result */
     huft_build(c, 30, 0, cpdist, cpdext, &fixed_td, &fixed_bd, &z);
 
     /* done */
+    Assert(f == 0, "invalid build of fixed tables");
     fixed_built = 1;
   }
-  fixed_lock--;
   *bl = fixed_bl;
   *bd = fixed_bd;
   *tl = fixed_tl;
@@ -451,15 +451,24 @@ inflate_huft * FAR *td;  /* distance tree result */
 
 int inflate_trees_free(t, z)
 inflate_huft *t;        /* table to free */
-z_stream *z;            /* for zfree function */
+z_streamp z;            /* for zfree function */
 /* Free the malloc'ed tables built by huft_build(), which makes a linked
    list of the tables it made, with the links in a dummy first entry of
    each table. */
 {
-  register inflate_huft *p, *q;
+  register inflate_huft *p, *q, *r;
 
+  /* Reverse linked list */
+  p = Z_NULL;
+  q = t;
+  while (q != Z_NULL)
+  {
+    r = (q - 1)->next;
+    (q - 1)->next = p;
+    p = q;
+    q = r;
+  }
   /* Go through linked list, freeing from the malloced (t[-1]) address. */
-  p = t;
   while (p != Z_NULL)
   {
     q = (--p)->next;

inftrees.h

@@ -1,5 +1,5 @@
 /* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -35,7 +35,7 @@ extern int inflate_trees_bits OF((
     uIntf *,                    /* 19 code lengths */
     uIntf *,                    /* bits tree desired/actual depth */
     inflate_huft * FAR *,       /* bits tree result */
-    z_stream *));               /* for zalloc, zfree functions */
+    z_streamp ));               /* for zalloc, zfree functions */
 
 extern int inflate_trees_dynamic OF((
     uInt,                       /* number of literal/length codes */
@@ -45,7 +45,7 @@ extern int inflate_trees_dynamic OF((
     uIntf *,                    /* distance desired/actual bit depth */
     inflate_huft * FAR *,       /* literal/length tree result */
     inflate_huft * FAR *,       /* distance tree result */
-    z_stream *));               /* for zalloc, zfree functions */
+    z_streamp ));               /* for zalloc, zfree functions */
 
 extern int inflate_trees_fixed OF((
     uIntf *,                    /* literal desired/actual bit depth */
@@ -55,5 +55,5 @@ extern int inflate_trees_fixed OF((
 
 extern int inflate_trees_free OF((
     inflate_huft *,             /* tables to free */
-    z_stream *));               /* for zfree function */
+    z_streamp ));               /* for zfree function */
 

infutil.c

@@ -1,5 +1,5 @@
 /* inflate_util.c -- data and routines common to blocks and codes
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -12,7 +12,7 @@
 struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 
 /* And'ing with mask[n] masks the lower n bits */
-uInt inflate_mask[] = {
+uInt inflate_mask[17] = {
     0x0000,
     0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
     0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
@@ -22,11 +22,12 @@ uInt inflate_mask[] = {
 /* copy as much as possible from the sliding window to the output area */
 int inflate_flush(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
   uInt n;
-  Bytef *p, *q;
+  Bytef *p;
+  Bytef *q;
 
   /* local copies of source and destination pointers */
   p = z->next_out;
@@ -43,7 +44,7 @@ int r;
 
   /* update check information */
   if (s->checkfn != Z_NULL)
-    s->check = (*s->checkfn)(s->check, q, n);
+    z->adler = s->check = (*s->checkfn)(s->check, q, n);
 
   /* copy as far as end of window */
   zmemcpy(p, q, n);
@@ -69,7 +70,7 @@ int r;
 
     /* update check information */
     if (s->checkfn != Z_NULL)
-      s->check = (*s->checkfn)(s->check, q, n);
+      z->adler = s->check = (*s->checkfn)(s->check, q, n);
 
     /* copy */
     zmemcpy(p, q, n);

infutil.h

@@ -1,5 +1,5 @@
 /* infutil.h -- types and macros common to blocks and codes
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,11 +8,10 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* inflate blocks semi-private state */
+#ifndef _INFUTIL_H
-struct inflate_blocks_state {
+#define _INFUTIL_H
 
-  /* mode */
+typedef enum {
-  enum {
       TYPE,     /* get type bits (3, including end bit) */
       LENS,     /* get lengths for stored */
       STORED,   /* processing stored block */
@@ -23,7 +22,13 @@ struct inflate_blocks_state {
       DRY,      /* output remaining window bytes */
       DONE,     /* finished last block, done */
       BAD}      /* got a data error--stuck here */
-    mode;               /* current inflate_block mode */
+inflate_block_mode;
+
+/* inflate blocks semi-private state */
+struct inflate_blocks_state {
+
+  /* mode */
+  inflate_block_mode  mode;     /* current inflate_block mode */
 
   /* mode dependent information */
   union {
@@ -36,7 +41,8 @@ struct inflate_blocks_state {
       inflate_huft *tb;         /* bit length decoding tree */
     } trees;            /* if DTREE, decoding info for trees */
     struct {
-      inflate_huft *tl, *td;    /* trees to free */
+      inflate_huft *tl;
+      inflate_huft *td;         /* trees to free */
       inflate_codes_statef 
          *codes;
     } decode;           /* if CODES, current state */
@@ -70,22 +76,24 @@ struct inflate_blocks_state {
 #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
 #define DUMPBITS(j) {b>>=(j);k-=(j);}
 /*   output bytes */
-#define WAVAIL (q<s->read?s->read-q-1:s->end-q)
+#define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q)
-#define LOADOUT {q=s->write;m=WAVAIL;}
+#define LOADOUT {q=s->write;m=(uInt)WAVAIL;}
-#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=WAVAIL;}}
+#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}}
 #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}
 #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}
 #define OUTBYTE(a) {*q++=(Byte)(a);m--;}
 /*   load local pointers */
 #define LOAD {LOADIN LOADOUT}
 
-/* masks for lower bits */
+/* masks for lower bits (size given to avoid silly warnings with Visual C++) */
-extern uInt inflate_mask[];
+extern uInt inflate_mask[17];
 
 /* copy as much as possible from the sliding window to the output area */
 extern int inflate_flush OF((
     inflate_blocks_statef *,
-    z_stream *,
+    z_streamp ,
     int));
 
 struct internal_state      {int dummy;}; /* for buggy compilers */
+
+#endif

minigzip.c

@@ -1,5 +1,5 @@
 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -13,20 +13,19 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.5 1995/05/03 17:27:11 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
 
-#ifndef __GO32__
-extern void exit  OF((int));
-#endif
-extern int unlink OF((const char *));
-
 #ifdef STDC
 #  include <string.h>
+#  include <stdlib.h>
+#else
+   extern void exit  OF((int));
 #endif
 
+
 #if defined(MSDOS) || defined(OS2) || defined(WIN32)
 #  include <fcntl.h>
 #  include <io.h>
@@ -36,24 +35,35 @@ extern int unlink OF((const char *));
 #endif
 
 #ifdef VMS
+#  define unlink delete
 #  define GZ_SUFFIX "-gz"
-#else
+#endif
+#ifdef RISCOS
+#  define unlink remove
+#  define GZ_SUFFIX "-gz"
+#  define fileno(file) file->__file
+#endif
+
+#ifndef GZ_SUFFIX
 #  define GZ_SUFFIX ".gz"
 #endif
-#define SUFFIX_LEN sizeof(GZ_SUFFIX)
+#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
+
+extern int unlink OF((const char *));
 
 #define BUFLEN 4096
 #define MAX_NAME_LEN 1024
 
+#ifdef MAXSEG_64K
 #  define local static
-/* For MSDOS and other systems with limitation on stack size. For Unix,
+   /* Needed for systems with limitation on stack size. */
+#else
 #  define local
-   works also.
+#endif
- */
 
 char *prog;
 
-void error           OF((char *msg));
+void error           OF((const char *msg));
 void gz_compress     OF((FILE   *in, gzFile out));
 void gz_uncompress   OF((gzFile in, FILE   *out));
 void file_compress   OF((char  *file));
@@ -64,7 +74,7 @@ int  main            OF((int argc, char *argv[]));
  * Display error message and exit
  */
 void error(msg)
-    char *msg;
+    const char *msg;
 {
     fprintf(stderr, "%s: %s\n", prog, msg);
     exit(1);
@@ -89,7 +99,7 @@ void gz_compress(in, out)
         }
         if (len == 0) break;
 
-        if (gzwrite(out, buf, len) != len) error(gzerror(out, &err));
+        if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
     }
     fclose(in);
     if (gzclose(out) != Z_OK) error("failed gzclose");
@@ -111,7 +121,9 @@ void gz_uncompress(in, out)
         if (len < 0) error (gzerror(in, &err));
         if (len == 0) break;
 
-        if (fwrite(buf, 1, len, out) != (uInt)len) error("failed fwrite");
+        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+	    error("failed fwrite");
+	}
     }
     if (fclose(out)) error("failed fclose");
 
@@ -190,7 +202,11 @@ void file_uncompress(file)
 
 
 /* ===========================================================================
- * Usage:  minigzip [-d] [files...]
+ * Usage:  minigzip [-d] [-f] [-h] [-1 to -9] [files...]
+ *   -d : decompress
+ *   -f : compress with Z_FILTERED
+ *   -h : compress with Z_HUFFMAN_ONLY
+ *   -1 to -9 : compression level
  */
 
 int main(argc, argv)
@@ -199,16 +215,27 @@ int main(argc, argv)
 {
     int uncompr = 0;
     gzFile file;
+    char outmode[20];
+
+    strcpy(outmode, "wb6 ");
 
     prog = argv[0];
     argc--, argv++;
 
-    if (argc > 0) {
+    while (argc > 0) {
-        uncompr = (strcmp(*argv, "-d") == 0);
+      if (strcmp(*argv, "-d") == 0)
-        if (uncompr) {
+	uncompr = 1;
+      else if (strcmp(*argv, "-f") == 0)
+	outmode[3] = 'f';
+      else if (strcmp(*argv, "-h") == 0)
+	outmode[3] = 'h';
+      else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
+	       (*argv)[2] == 0)
+	outmode[2] = (*argv)[1];
+      else
+	break;
       argc--, argv++;
     }
-    }
     if (argc == 0) {
         SET_BINARY_MODE(stdin);
         SET_BINARY_MODE(stdout);
@@ -217,7 +244,7 @@ int main(argc, argv)
             if (file == NULL) error("can't gzdopen stdin");
             gz_uncompress(file, stdout);
         } else {
-            file = gzdopen(fileno(stdout), "wb"); /* "wb9" for max compr. */
+            file = gzdopen(fileno(stdout), outmode);
             if (file == NULL) error("can't gzdopen stdout");
             gz_compress(stdin, file);
         }

msdos/Makefile.b32

@@ -0,0 +1,104 @@
+# Makefile for zlib
+# Borland C++   
+
+# This version of the zlib makefile was adapted by Chris Young for use
+# with Borland C 4.5x with the Dos Power Pack for a 32-bit protected mode
+# flat memory model.  It was created for use with POV-Ray ray tracer and
+# you may choose to edit the CFLAGS to suit your needs but the
+# switches -WX and -DMSDOS are required.
+# -- Chris Young 76702.1655@compuserve.com
+
+# To use, do "make -fmakefile.b32"
+
+# See zconf.h for details about the memory requirements.
+
+# ------------- Borland C++ -------------
+MODEL=-WX 
+CFLAGS= $(MODEL) -P-C -K -N- -k- -d -3 -r- -v- -f -DMSDOS
+CC=bcc32
+LD=bcc32
+LIB=tlib
+LDFLAGS= $(MODEL)
+O=.obj
+
+# variables
+OBJ1 = adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) \
+  trees$(O)
+OBJP1 = adler32$(O)+compress$(O)+crc32$(O)+gzio$(O)+uncompr$(O)+deflate$(O)+\
+  trees$(O)
+OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
+  infutil$(O) inffast$(O)
+OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
+  infutil$(O)+inffast$(O)
+
+all: test
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h\
+   infcodes.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h\
+   infcodes.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+# we must cut the command line to fit in the MS/DOS 128 byte limit:
+zlib.lib: $(OBJ1) $(OBJ2)
+	del zlib.lib
+	$(LIB) zlib +$(OBJP1)
+	$(LIB) zlib +$(OBJP2)
+
+example.exe: example.obj zlib.lib
+	$(LD) $(LDFLAGS) example.obj zlib.lib
+
+minigzip.exe: minigzip.obj zlib.lib
+	$(LD) $(LDFLAGS) minigzip.obj zlib.lib
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d 
+
+#clean:
+#	del *.obj
+#	del *.exe

msdos/Makefile.bor

@@ -2,6 +2,7 @@
 # Borland C++   ************ UNTESTED ***********
 
 # To use, do "make -fmakefile.bor"
+# To compile in small model, set below: MODEL=-ms
 
 # WARNING: the small model is supported but only for small values of
 # MAX_WBITS and MAX_MEM_LEVEL. For example:
@@ -17,7 +18,7 @@ CFLAGS=-O2 -Z $(MODEL)
 CC=bcc
 LD=bcc
 LIB=tlib
-#   replace bcc with tcc for Turbo C++ 1.0
+#   replace bcc with tcc for Turbo C++ 1.0, with bcc32 for the 32 bit version
 LDFLAGS=$(MODEL)
 O=.obj
 

msdos/Makefile.dj2

@@ -0,0 +1,100 @@
+# Makefile for zlib.  Modified for djgpp v2.0 by F. J. Donahoe, 3/15/96.
+# Copyright (C) 1995-1998 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h 
+
+# To compile, or to compile and test, type:
+# 
+#   make -fmakefile.dj2;  make test -fmakefile.dj2
+# 
+# To install libz.a, zconf.h and zlib.h in the djgpp directories, type:
+# 
+#    make install -fmakefile.dj2
+# 
+# after first defining LIBRARY_PATH and INCLUDE_PATH in djgpp.env as
+# in the sample below if the pattern of the DJGPP distribution is to
+# be followed.  Remember that, while <sp>'es around <=> are ignored in
+# makefiles, they are *not* in batch files or in djgpp.env.
+# - - - - -
+# [make]
+# INCLUDE_PATH=%\>;INCLUDE_PATH%%\DJDIR%\include
+# LIBRARY_PATH=%\>;LIBRARY_PATH%%\DJDIR%\lib
+# BUTT=-m486
+# - - - - -
+# Alternately, these variables may be defined below, overriding the values
+# in djgpp.env, as
+# INCLUDE_PATH=c:\usr\include
+# LIBRARY_PATH=c:\usr\lib
+
+CC=gcc
+
+#CFLAGS=-MMD -O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-MMD -g -DDEBUG
+CFLAGS=-MMD -O3 $(BUTT) -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+             -Wstrict-prototypes -Wmissing-prototypes
+
+# If cp.exe is available, replace "copy /Y" with "cp -fp" .
+CP=copy /Y
+# If gnu install.exe is available, replace $(CP) with ginstall.
+INSTALL=$(CP)
+# The default value of RM is "rm -f."  If "rm.exe" is found, comment out:
+RM=del
+LDLIBS=-L. -lz
+LD=$(CC) -s -o
+LDSHARED=$(CC)
+
+INCL=zlib.h zconf.h
+LIBS=libz.a
+
+AR=ar rcs
+
+prefix=/usr/local
+exec_prefix = $(prefix)
+
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
+
+TEST_OBJS = example.o minigzip.o
+
+all: example.exe minigzip.exe
+
+test: all
+	./example
+	echo hello world | .\minigzip | .\minigzip -d 
+
+%.o : %.c
+	$(CC) $(CFLAGS) -c $< -o $@
+
+libz.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+
+%.exe : %.o $(LIBS)
+	$(LD) $@ $< $(LDLIBS)
+
+# INCLUDE_PATH and LIBRARY_PATH were set for [make] in djgpp.env .
+
+.PHONY : uninstall clean
+
+install: $(INCL) $(LIBS)
+	-@if not exist $(INCLUDE_PATH)\nul mkdir $(INCLUDE_PATH)
+	-@if not exist $(LIBRARY_PATH)\nul mkdir $(LIBRARY_PATH)
+	$(INSTALL) zlib.h $(INCLUDE_PATH)
+	$(INSTALL) zconf.h $(INCLUDE_PATH)
+	$(INSTALL) libz.a $(LIBRARY_PATH)
+
+uninstall:
+	$(RM) $(INCLUDE_PATH)\zlib.h
+	$(RM) $(INCLUDE_PATH)\zconf.h
+	$(RM) $(LIBRARY_PATH)\libz.a
+
+clean:
+	$(RM) *.d
+	$(RM) *.o
+	$(RM) *.exe
+	$(RM) libz.a
+	$(RM) foo.gz
+
+DEPS := $(wildcard *.d)
+ifneq ($(DEPS),)
+include $(DEPS)
+endif

msdos/Makefile.msc

@@ -2,6 +2,7 @@
 # Microsoft C 5.1 or later
 
 # To use, do "make makefile.msc"
+# To compile in small model, set below: MODEL=-AS
 
 # If you wish to reduce the memory requirements (default 256K for big
 # objects plus a few K), you can add to CFLAGS below: 
@@ -14,7 +15,7 @@ CFLAGS=-Oait -Gs -nologo -W3 $(MODEL)
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
-LDFLAGS=/e/st:0x1000/noe
+LDFLAGS=/e/st:0x1500/noe
 O=.obj
 
 # variables
@@ -27,6 +28,8 @@ OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
 OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
   infutil$(O)+inffast$(O)
 
+all:  zlib.lib example.exe minigzip.exe
+
 adler32.obj: adler32.c zutil.h zlib.h zconf.h
 	$(CC) -c $(CFLAGS) $*.c
 
@@ -79,7 +82,7 @@ minigzip.obj: minigzip.c zlib.h zconf.h
 
 # we must cut the command line to fit in the MS/DOS 128 byte limit:
 zlib.lib: $(OBJ1) $(OBJ2)
-        del zlib.lib
+	if exist zlib.lib del zlib.lib
 	lib zlib $(OBJ1);
 	lib zlib $(OBJ2);
 

msdos/Makefile.tc

@@ -2,10 +2,11 @@
 # TurboC 2.0
 
 # To use, do "make -fmakefile.tc"
+# To compile in small model, set below: MODEL=-ms
 
 # WARNING: the small model is supported but only for small values of
 # MAX_WBITS and MAX_MEM_LEVEL. For example:
-#    -DMAX_WBITS=11 -DDEF_WBITS=11 -DMAX_MEM_LEVEL=3
+#    -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 # If you wish to reduce the memory requirements (default 256K for big
 # objects plus a few K), you can add to CFLAGS below: 
 #   -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
@@ -13,6 +14,7 @@
 
 # ------------- Turbo C 2.0 -------------
 MODEL=-ml
+# CFLAGS=-O2 -G -Z $(MODEL) -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
 CFLAGS=-O2 -G -Z $(MODEL)
 CC=tcc -I\tc\include
 LD=tcc -L\tc\lib

msdos/Makefile.wat

@@ -0,0 +1,103 @@
+# Makefile for zlib
+# Watcom 10a
+
+# This version of the zlib makefile was adapted by Chris Young for use
+# with Watcom 10a 32-bit protected mode flat memory model.  It was created 
+# for use with POV-Ray ray tracer and you may choose to edit the CFLAGS to 
+# suit your needs but the -DMSDOS is required.
+# -- Chris Young 76702.1655@compuserve.com
+
+# To use, do "wmake -f makefile.wat"
+
+# See zconf.h for details about the memory requirements.
+
+# ------------- Watcom 10a -------------
+MODEL=-mf 
+CFLAGS= $(MODEL) -fpi87 -fp5 -zp4 -5r -w5 -oneatx -DMSDOS
+CC=wcc386
+LD=wcl386
+LIB=wlib -b -c 
+LDFLAGS= 
+O=.obj
+
+# variables
+OBJ1=adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) 
+OBJ2=trees$(O) zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) 
+OBJ3=infutil$(O) inffast$(O)
+OBJP1=adler32$(O)+compress$(O)+crc32$(O)+gzio$(O)+uncompr$(O)+deflate$(O)
+OBJP2=trees$(O)+zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)
+OBJP3=infutil$(O)+inffast$(O)
+
+all: test
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h &
+  infcodes.h infutil.h
+	$(CC) $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h &
+  infcodes.h inffast.h
+	$(CC) $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) $(CFLAGS) $*.c
+
+# we must cut the command line to fit in the MS/DOS 128 byte limit:
+zlib.lib: $(OBJ1) $(OBJ2) $(OBJ3) 
+	del zlib.lib
+	$(LIB) zlib.lib +$(OBJP1)
+	$(LIB) zlib.lib +$(OBJP2)
+	$(LIB) zlib.lib +$(OBJP3)
+
+example.exe: example.obj zlib.lib
+	$(LD) $(LDFLAGS) example.obj zlib.lib
+
+minigzip.exe: minigzip.obj zlib.lib
+	$(LD) $(LDFLAGS) minigzip.obj zlib.lib
+
+test: minigzip.exe example.exe
+	example
+	echo hello world | minigzip | minigzip -d >test
+	type test
+
+#clean:
+#	del *.obj
+#	del *.exe

msdos/zlib.def

@@ -0,0 +1,57 @@
+LIBRARY		"zlib"
+
+DESCRIPTION	'"""zlib data compression library"""'
+
+EXETYPE		NT
+
+SUBSYSTEM	WINDOWS
+
+STUB		'WINSTUB.EXE'
+
+VERSION		1.07
+
+CODE		 EXECUTE READ
+
+DATA		 READ WRITE
+
+HEAPSIZE	1048576,4096
+
+EXPORTS
+    adler32                        @1
+    compress                       @2
+    crc32                          @3
+    deflate                        @4
+    deflateCopy                    @5
+    deflateEnd                     @6
+    deflateInit2_                  @7
+    deflateInit_                   @8
+    deflateParams                  @9
+    deflateReset                   @10
+    deflateSetDictionary           @11
+    gzclose                        @12
+    gzdopen                        @13
+    gzerror                        @14
+    gzflush                        @15
+    gzopen                         @16
+    gzread                         @17
+    gzwrite                        @18
+    inflate                        @19
+    inflateEnd                     @20
+    inflateInit2_                  @21
+    inflateInit_                   @22
+    inflateReset                   @23
+    inflateSetDictionary           @24
+    inflateSync                    @25
+    uncompress                     @26
+    zlibVersion                    @27
+    gzprintf                       @28
+    gzputc                         @29
+    gzgetc                         @30
+    gzseek                         @31
+    gzrewind                       @32
+    gztell                         @33
+    gzeof                          @34
+    gzsetparams                    @35
+    zError                         @36
+    inflateSyncPoint               @37
+    get_crc_table                  @38

msdos/zlib.rc

@@ -0,0 +1,32 @@
+#include <windows.h>
+
+#define IDR_VERSION1  1
+IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
+  FILEVERSION	 1,0,7,0
+  PRODUCTVERSION 1,0,7,0
+  FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
+  FILEFLAGS	0
+  FILEOS	VOS_DOS_WINDOWS32
+  FILETYPE	VFT_DLL
+  FILESUBTYPE	0	// not used
+BEGIN
+  BLOCK "StringFileInfo"
+  BEGIN
+    BLOCK "040904E4"
+    //language ID = U.S. English, char set = Windows, Multilingual
+
+    BEGIN
+      VALUE "FileDescription", "zlib data compression library\0"
+      VALUE "FileVersion",	"1.0.7\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlib.lib\0"
+      VALUE "ProductName",	"ZLib.DLL\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-1998 Jean-loup Gailly & Mark Adler\0"
+    END
+  END
+  BLOCK "VarFileInfo"
+  BEGIN
+    VALUE "Translation", 0x0409, 1252
+  END
+END

nt/Makefile.nt

@@ -0,0 +1,88 @@
+# Makefile for zlib
+
+!include <ntwin32.mak>
+
+CC=cl
+LD=link
+CFLAGS=-O -nologo
+LDFLAGS=
+O=.obj
+
+# variables
+OBJ1 = adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) \
+  trees$(O)
+OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
+  infutil$(O) inffast$(O)
+
+all:  zlib.dll example.exe minigzip.exe
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h\
+   infcodes.h infutil.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h\
+   infcodes.h inffast.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) -c $(cvarsdll) $(CFLAGS) $*.c
+
+zlib.dll: $(OBJ1) $(OBJ2) zlib.dnt
+	link $(dlllflags) -out:$@ -def:zlib.dnt $(OBJ1) $(OBJ2) $(guilibsdll)
+
+zlib.lib: zlib.dll
+
+example.exe: example.obj zlib.lib
+	$(LD) $(LDFLAGS) example.obj zlib.lib
+
+minigzip.exe: minigzip.obj zlib.lib
+	$(LD) $(LDFLAGS) minigzip.obj zlib.lib
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d 
+
+clean:
+	del *.obj
+	del *.exe
+	del *.dll
+	del *.lib

nt/zlib.dnt

@@ -0,0 +1,44 @@
+LIBRARY		zlib.dll
+EXETYPE WINDOWS
+CODE		 PRELOAD MOVEABLE DISCARDABLE
+DATA		 PRELOAD MOVEABLE MULTIPLE
+
+EXPORTS
+    adler32                        @1
+    compress                       @2
+    crc32                          @3
+    deflate                        @4
+    deflateCopy                    @5
+    deflateEnd                     @6
+    deflateInit2_                  @7
+    deflateInit_                   @8
+    deflateParams                  @9
+    deflateReset                   @10
+    deflateSetDictionary           @11
+    gzclose                        @12
+    gzdopen                        @13
+    gzerror                        @14
+    gzflush                        @15
+    gzopen                         @16
+    gzread                         @17
+    gzwrite                        @18
+    inflate                        @19
+    inflateEnd                     @20
+    inflateInit2_                  @21
+    inflateInit_                   @22
+    inflateReset                   @23
+    inflateSetDictionary           @24
+    inflateSync                    @25
+    uncompress                     @26
+    zlibVersion                    @27
+    gzprintf                       @28
+    gzputc                         @29
+    gzgetc                         @30
+    gzseek                         @31
+    gzrewind                       @32
+    gztell                         @33
+    gzeof                          @34
+    gzsetparams                    @35
+    zError                         @36
+    inflateSyncPoint               @37
+    get_crc_table                  @38

trees.c

@@ -1,5 +1,5 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995 Jean-loup Gailly
+ * Copyright (C) 1995-1998 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -29,7 +29,7 @@
  *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
  */
 
-/* $Id: trees.c,v 1.5 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include "deflate.h"
 
@@ -56,16 +56,16 @@
 #define REPZ_11_138  18
 /* repeat a zero length 11-138 times  (7 bits of repeat count) */
 
-local int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
+local const int extra_lbits[LENGTH_CODES] /* extra bits for each length code */
    = {0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0};
 
-local int extra_dbits[D_CODES] /* extra bits for each distance code */
+local const int extra_dbits[D_CODES] /* extra bits for each distance code */
    = {0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
 
-local int extra_blbits[BL_CODES]/* extra bits for each bit length code */
+local const int extra_blbits[BL_CODES]/* extra bits for each bit length code */
    = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,2,3,7};
 
-local uch bl_order[BL_CODES]
+local const uch bl_order[BL_CODES]
    = {16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15};
 /* The lengths of the bit length codes are sent in order of decreasing
  * probability, to avoid transmitting the lengths for unused bit length codes.
@@ -78,13 +78,12 @@ local uch bl_order[BL_CODES]
 
 /* ===========================================================================
  * Local data. These are initialized only once.
- * To do: initialize at compile time to be completely reentrant. ???
  */
 
 local ct_data static_ltree[L_CODES+2];
 /* The static literal tree. Since the bit lengths are imposed, there is no
  * need for the L_CODES extra codes used during heap construction. However
- * The codes 286 and 287 are needed to build a canonical tree (see ct_init
+ * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
  * below).
  */
 
@@ -110,7 +109,7 @@ local int base_dist[D_CODES];
 
 struct static_tree_desc_s {
     ct_data *static_tree;        /* static tree or NULL */
-    intf    *extra_bits;         /* extra bits for each code or NULL */
+    const intf *extra_bits;      /* extra bits for each code or NULL */
     int     extra_base;          /* base index for extra_bits */
     int     elems;               /* max number of elements in the tree */
     int     max_length;          /* max bit length for the codes */
@@ -129,7 +128,7 @@ local static_tree_desc  static_bl_desc =
  * Local (static) routines in this file.
  */
 
-local void ct_static_init OF((void));
+local void tr_static_init OF((void));
 local void init_block     OF((deflate_state *s));
 local void pqdownheap     OF((deflate_state *s, ct_data *tree, int k));
 local void gen_bitlen     OF((deflate_state *s, tree_desc *desc));
@@ -143,9 +142,9 @@ local void send_all_trees OF((deflate_state *s, int lcodes, int dcodes,
 local void compress_block OF((deflate_state *s, ct_data *ltree,
                               ct_data *dtree));
 local void set_data_type  OF((deflate_state *s));
-local void send_bits      OF((deflate_state *s, int value, int length));
 local unsigned bi_reverse OF((unsigned value, int length));
 local void bi_windup      OF((deflate_state *s));
+local void bi_flush       OF((deflate_state *s));
 local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
                               int header));
 
@@ -155,7 +154,7 @@ local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
 
 #else /* DEBUG */
 #  define send_code(s, c, tree) \
-     { if (verbose>1) fprintf(stderr,"\ncd %3d ",(c)); \
+     { if (z_verbose>2) fprintf(stderr,"\ncd %3d ",(c)); \
        send_bits(s, tree[c].Code, tree[c].Len); }
 #endif
 
@@ -166,15 +165,74 @@ local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
  * used.
  */
 
+/* ===========================================================================
+ * Output a short LSB first on the stream.
+ * IN assertion: there is enough room in pendingBuf.
+ */
+#define put_short(s, w) { \
+    put_byte(s, (uch)((w) & 0xff)); \
+    put_byte(s, (uch)((ush)(w) >> 8)); \
+}
+
+/* ===========================================================================
+ * Send a value on a given number of bits.
+ * IN assertion: length <= 16 and value fits in length bits.
+ */
+#ifdef DEBUG
+local void send_bits      OF((deflate_state *s, int value, int length));
+
+local void send_bits(s, value, length)
+    deflate_state *s;
+    int value;  /* value to send */
+    int length; /* number of bits */
+{
+    Tracevv((stderr," l %2d v %4x ", length, value));
+    Assert(length > 0 && length <= 15, "invalid length");
+    s->bits_sent += (ulg)length;
+
+    /* If not enough room in bi_buf, use (valid) bits from bi_buf and
+     * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
+     * unused bits in value.
+     */
+    if (s->bi_valid > (int)Buf_size - length) {
+        s->bi_buf |= (value << s->bi_valid);
+        put_short(s, s->bi_buf);
+        s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
+        s->bi_valid += length - Buf_size;
+    } else {
+        s->bi_buf |= value << s->bi_valid;
+        s->bi_valid += length;
+    }
+}
+#else /* !DEBUG */
+
+#define send_bits(s, value, length) \
+{ int len = length;\
+  if (s->bi_valid > (int)Buf_size - len) {\
+    int val = value;\
+    s->bi_buf |= (val << s->bi_valid);\
+    put_short(s, s->bi_buf);\
+    s->bi_buf = (ush)val >> (Buf_size - s->bi_valid);\
+    s->bi_valid += len - Buf_size;\
+  } else {\
+    s->bi_buf |= (value) << s->bi_valid;\
+    s->bi_valid += len;\
+  }\
+}
+#endif /* DEBUG */
+
+
 #define MAX(a,b) (a >= b ? a : b)
 /* the arguments must not have side effects */
 
 /* ===========================================================================
- * Initialize the various 'constant' tables.
+ * Initialize the various 'constant' tables. In a multi-threaded environment,
- * To do: do this at compile time.
+ * this function may be called by two threads concurrently, but this is
+ * harmless since both invocations do exactly the same thing.
  */
-local void ct_static_init()
+local void tr_static_init()
 {
+    static int static_init_done = 0;
     int n;        /* iterates over tree elements */
     int bits;     /* bit counter */
     int length;   /* length value */
@@ -183,6 +241,8 @@ local void ct_static_init()
     ush bl_count[MAX_BITS+1];
     /* number of codes at each bit length for an optimal tree */
 
+    if (static_init_done) return;
+
     /* Initialize the mapping length (0..255) -> length code (0..28) */
     length = 0;
     for (code = 0; code < LENGTH_CODES-1; code++) {
@@ -191,7 +251,7 @@ local void ct_static_init()
             length_code[length++] = (uch)code;
         }
     }
-    Assert (length == 256, "ct_static_init: length != 256");
+    Assert (length == 256, "tr_static_init: length != 256");
     /* Note that the length 255 (match length 258) can be represented
      * in two different ways: code 284 + 5 bits or code 285, so we
      * overwrite length_code[255] to use the best encoding:
@@ -206,7 +266,7 @@ local void ct_static_init()
             dist_code[dist++] = (uch)code;
         }
     }
-    Assert (dist == 256, "ct_static_init: dist != 256");
+    Assert (dist == 256, "tr_static_init: dist != 256");
     dist >>= 7; /* from now on, all distances are divided by 128 */
     for ( ; code < D_CODES; code++) {
         base_dist[code] = dist << 7;
@@ -214,7 +274,7 @@ local void ct_static_init()
             dist_code[256 + dist++] = (uch)code;
         }
     }
-    Assert (dist == 256, "ct_static_init: 256+dist != 512");
+    Assert (dist == 256, "tr_static_init: 256+dist != 512");
 
     /* Construct the codes of the static literal tree */
     for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
@@ -232,19 +292,18 @@ local void ct_static_init()
     /* The static distance tree is trivial: */
     for (n = 0; n < D_CODES; n++) {
         static_dtree[n].Len = 5;
-        static_dtree[n].Code = bi_reverse(n, 5);
+        static_dtree[n].Code = bi_reverse((unsigned)n, 5);
     }
+    static_init_done = 1;
 }
 
 /* ===========================================================================
  * Initialize the tree data structures for a new zlib stream.
  */
-void ct_init(s)
+void _tr_init(s)
     deflate_state *s;
 {
-    if (static_dtree[0].Len == 0) {
+    tr_static_init();
-        ct_static_init();              /* To do: at compile time */
-    }
 
     s->compressed_len = 0L;
 
@@ -259,6 +318,7 @@ void ct_init(s)
 
     s->bi_buf = 0;
     s->bi_valid = 0;
+    s->last_eob_len = 8; /* enough lookahead for inflate */
 #ifdef DEBUG
     s->bits_sent = 0L;
 #endif
@@ -356,7 +416,7 @@ local void gen_bitlen(s, desc)
     ct_data *tree  = desc->dyn_tree;
     int max_code   = desc->max_code;
     ct_data *stree = desc->stat_desc->static_tree;
-    intf *extra    = desc->stat_desc->extra_bits;
+    const intf *extra = desc->stat_desc->extra_bits;
     int base       = desc->stat_desc->extra_base;
     int max_length = desc->stat_desc->max_length;
     int h;              /* heap index */
@@ -465,7 +525,7 @@ local void gen_codes (tree, max_code, bl_count)
         /* Now reverse the bits */
         tree[n].Code = bi_reverse(next_code[len]++, len);
 
-        Tracec(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
+        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
              n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
     }
 }
@@ -725,28 +785,49 @@ local void send_all_trees(s, lcodes, dcodes, blcodes)
 /* ===========================================================================
  * Send a stored block
  */
-void ct_stored_block(s, buf, stored_len, eof)
+void _tr_stored_block(s, buf, stored_len, eof)
     deflate_state *s;
     charf *buf;       /* input block */
     ulg stored_len;   /* length of input block */
     int eof;          /* true if this is the last block for a file */
 {
     send_bits(s, (STORED_BLOCK<<1)+eof, 3);  /* send block type */
-    s->compressed_len = (s->compressed_len + 3 + 7) & ~7L;
+    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
     s->compressed_len += (stored_len + 4) << 3;
 
     copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
 }
 
 /* ===========================================================================
- * Send one empty static block to give enough lookahead for inflate
+ * Send one empty static block to give enough lookahead for inflate.
+ * This takes 10 bits, of which 7 may remain in the bit buffer.
+ * The current inflate code requires 9 bits of lookahead. If the
+ * last two codes for the previous block (real code plus EOB) were coded
+ * on 5 bits or less, inflate may have only 5+3 bits of lookahead to decode
+ * the last real code. In this case we send two empty static blocks instead
+ * of one. (There are no problems if the previous block is stored or fixed.)
+ * To simplify the code, we assume the worst case of last real code encoded
+ * on one bit only.
  */
-void ct_align(s)
+void _tr_align(s)
     deflate_state *s;
 {
     send_bits(s, STATIC_TREES<<1, 3);
     send_code(s, END_BLOCK, static_ltree);
     s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
+    bi_flush(s);
+    /* Of the 10 bits for the empty block, we have already sent
+     * (10 - bi_valid) bits. The lookahead for the last real code (before
+     * the EOB of the previous block) was thus at least one plus the length
+     * of the EOB plus what we have just sent of the empty static block.
+     */
+    if (1 + s->last_eob_len + 10 - s->bi_valid < 9) {
+        send_bits(s, STATIC_TREES<<1, 3);
+        send_code(s, END_BLOCK, static_ltree);
+        s->compressed_len += 10L;
+        bi_flush(s);
+    }
+    s->last_eob_len = 7;
 }
 
 /* ===========================================================================
@@ -754,17 +835,20 @@ void ct_align(s)
  * trees or store, and output the encoded block to the zip file. This function
  * returns the total compressed length for the file so far.
  */
-ulg ct_flush_block(s, buf, stored_len, eof)
+ulg _tr_flush_block(s, buf, stored_len, eof)
     deflate_state *s;
     charf *buf;       /* input block, or NULL if too old */
     ulg stored_len;   /* length of input block */
     int eof;          /* true if this is the last block for a file */
 {
     ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
-    int max_blindex;  /* index of last bit length code of non zero freq */
+    int max_blindex = 0;  /* index of last bit length code of non zero freq */
+
+    /* Build the Huffman trees unless a stored block is forced */
+    if (s->level > 0) {
 
 	 /* Check if the file is ascii or binary */
-    if (s->data_type == UNKNOWN) set_data_type(s);
+	if (s->data_type == Z_UNKNOWN) set_data_type(s);
 
 	/* Construct the literal and distance trees */
 	build_tree(s, (tree_desc *)(&(s->l_desc)));
@@ -793,13 +877,18 @@ ulg ct_flush_block(s, buf, stored_len, eof)
 
 	if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
 
+    } else {
+        Assert(buf != (char*)0, "lost buf");
+	opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
+    }
+
     /* If compression failed and this is the first and last block,
      * and if the .zip file can be seeked (to rewrite the local header),
      * the whole file is transformed into a stored file:
      */
 #ifdef STORED_FILE_OK
 #  ifdef FORCE_STORED_FILE
-    if (eof && compressed_len == 0L) { /* force stored file */
+    if (eof && s->compressed_len == 0L) { /* force stored file */
 #  else
     if (stored_len <= opt_lenb && eof && s->compressed_len==0L && seekable()) {
 #  endif
@@ -824,7 +913,7 @@ ulg ct_flush_block(s, buf, stored_len, eof)
          * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
          * transform a block into a stored block.
          */
-        ct_stored_block(s, buf, stored_len, eof);
+        _tr_stored_block(s, buf, stored_len, eof);
 
 #ifdef FORCE_STATIC
     } else if (static_lenb >= 0) { /* force static trees */
@@ -858,10 +947,10 @@ ulg ct_flush_block(s, buf, stored_len, eof)
  * Save the match info and tally the frequency counts. Return true if
  * the current block must be flushed.
  */
-int ct_tally (s, dist, lc)
+int _tr_tally (s, dist, lc)
     deflate_state *s;
-    int dist;  /* distance of matched string */
+    unsigned dist;  /* distance of matched string */
-    int lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
+    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
 {
     s->d_buf[s->last_lit] = (ush)dist;
     s->l_buf[s->last_lit++] = (uch)lc;
@@ -874,7 +963,7 @@ int ct_tally (s, dist, lc)
         dist--;             /* dist = match distance - 1 */
         Assert((ush)dist < (ush)MAX_DIST(s) &&
                (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
-               (ush)d_code(dist) < (ush)D_CODES,  "ct_tally: bad match");
+               (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
 
         s->dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
         s->dyn_dtree[d_code(dist)].Freq++;
@@ -884,7 +973,7 @@ int ct_tally (s, dist, lc)
     if (s->level > 2 && (s->last_lit & 0xfff) == 0) {
         /* Compute an upper bound for the compressed length */
         ulg out_length = (ulg)s->last_lit*8L;
-        ulg in_length = (ulg)s->strstart - s->block_start;
+        ulg in_length = (ulg)((long)s->strstart - s->block_start);
         int dcode;
         for (dcode = 0; dcode < D_CODES; dcode++) {
             out_length += (ulg)s->dyn_dtree[dcode].Freq *
@@ -950,6 +1039,7 @@ local void compress_block(s, ltree, dtree)
     } while (lx < s->last_lit);
 
     send_code(s, END_BLOCK, ltree);
+    s->last_eob_len = ltree[END_BLOCK].Len;
 }
 
 /* ===========================================================================
@@ -967,45 +1057,7 @@ local void set_data_type(s)
     while (n < 7)        bin_freq += s->dyn_ltree[n++].Freq;
     while (n < 128)    ascii_freq += s->dyn_ltree[n++].Freq;
     while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
-    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
+    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? Z_BINARY : Z_ASCII);
-}
-
-/* ===========================================================================
- * Output a short LSB first on the stream.
- * IN assertion: there is enough room in pendingBuf.
- */
-#define put_short(s, w) { \
-    put_byte(s, (uch)((w) & 0xff)); \
-    put_byte(s, (uch)((ush)(w) >> 8)); \
-}
-
-/* ===========================================================================
- * Send a value on a given number of bits.
- * IN assertion: length <= 16 and value fits in length bits.
- */
-local void send_bits(s, value, length)
-    deflate_state *s;
-    int value;  /* value to send */
-    int length; /* number of bits */
-{
-#ifdef DEBUG
-    Tracev((stderr," l %2d v %4x ", length, value));
-    Assert(length > 0 && length <= 15, "invalid length");
-    s->bits_sent += (ulg)length;
-#endif
-    /* If not enough room in bi_buf, use (valid) bits from bi_buf and
-     * (16 - bi_valid) bits from value, leaving (width - (16-bi_valid))
-     * unused bits in value.
-     */
-    if (s->bi_valid > (int)Buf_size - length) {
-        s->bi_buf |= (value << s->bi_valid);
-        put_short(s, s->bi_buf);
-        s->bi_buf = (ush)value >> (Buf_size - s->bi_valid);
-        s->bi_valid += length - Buf_size;
-    } else {
-        s->bi_buf |= value << s->bi_valid;
-        s->bi_valid += length;
-    }
 }
 
 /* ===========================================================================
@@ -1026,7 +1078,24 @@ local unsigned bi_reverse(code, len)
 }
 
 /* ===========================================================================
- * Write out any remaining bits in an incomplete byte.
+ * Flush the bit buffer, keeping at most 7 bits in it.
+ */
+local void bi_flush(s)
+    deflate_state *s;
+{
+    if (s->bi_valid == 16) {
+        put_short(s, s->bi_buf);
+        s->bi_buf = 0;
+        s->bi_valid = 0;
+    } else if (s->bi_valid >= 8) {
+        put_byte(s, (Byte)s->bi_buf);
+        s->bi_buf >>= 8;
+        s->bi_valid -= 8;
+    }
+}
+
+/* ===========================================================================
+ * Flush the bit buffer and align the output on a byte boundary
  */
 local void bi_windup(s)
     deflate_state *s;
@@ -1054,6 +1123,7 @@ local void copy_block(s, buf, len, header)
     int      header;  /* true if block header must be written */
 {
     bi_windup(s);        /* align on byte boundary */
+    s->last_eob_len = 8; /* enough lookahead for inflate */
 
     if (header) {
         put_short(s, (ush)len);   

uncompr.c

@@ -1,9 +1,9 @@
 /* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: uncompr.c,v 1.5 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -22,16 +22,16 @@
    enough memory, Z_BUF_ERROR if there was not enough room in the output
    buffer, or Z_DATA_ERROR if the input data was corrupted.
 */
-int uncompress (dest, destLen, source, sourceLen)
+int EXPORT uncompress (dest, destLen, source, sourceLen)
     Bytef *dest;
     uLongf *destLen;
-    Bytef *source;
+    const Bytef *source;
     uLong sourceLen;
 {
     z_stream stream;
     int err;
 
-    stream.next_in = source;
+    stream.next_in = (Bytef*)source;
     stream.avail_in = (uInt)sourceLen;
     /* Check for source > 64K on 16-bit machine: */
     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
@@ -49,7 +49,7 @@ int uncompress (dest, destLen, source, sourceLen)
     err = inflate(&stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         inflateEnd(&stream);
-        return err;
+        return err == Z_OK ? Z_BUF_ERROR : err;
     }
     *destLen = stream.total_out;
 

zconf.h

@@ -1,30 +1,68 @@
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zconf.h,v 1.12 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
 
 /*
-     The library does not install any signal handler. It is recommended to
+ * If you *really* need a unique prefix for all types and library functions,
-  add at least a handler for SIGSEGV when decompressing; the library checks
+ * compile with -DZ_PREFIX. The "standard" zlib should be compiled without it.
-  the consistency of the input data whenever possible but may go nuts
-  for some forms of corrupted input.
  */
+#ifdef Z_PREFIX
+#  define deflateInit_	z_deflateInit_
+#  define deflate	z_deflate
+#  define deflateEnd	z_deflateEnd
+#  define inflateInit_ 	z_inflateInit_
+#  define inflate	z_inflate
+#  define inflateEnd	z_inflateEnd
+#  define deflateInit2_	z_deflateInit2_
+#  define deflateSetDictionary z_deflateSetDictionary
+#  define deflateCopy	z_deflateCopy
+#  define deflateReset	z_deflateReset
+#  define deflateParams	z_deflateParams
+#  define inflateInit2_	z_inflateInit2_
+#  define inflateSetDictionary z_inflateSetDictionary
+#  define inflateSync	z_inflateSync
+#  define inflateSyncPoint z_inflateSyncPoint
+#  define inflateReset	z_inflateReset
+#  define compress	z_compress
+#  define uncompress	z_uncompress
+#  define adler32	z_adler32
+#  define crc32		z_crc32
+#  define get_crc_table z_get_crc_table
+
+#  define Byte		z_Byte
+#  define uInt		z_uInt
+#  define uLong		z_uLong
+#  define Bytef	        z_Bytef
+#  define charf		z_charf
+#  define intf		z_intf
+#  define uIntf		z_uIntf
+#  define uLongf	z_uLongf
+#  define voidpf	z_voidpf
+#  define voidp		z_voidp
+#endif
+
+#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
+#  define WIN32
+#endif
+#if defined(__GNUC__) || defined(WIN32) || defined(__386__) || defined(i386)
+#  ifndef __32BIT__
+#    define __32BIT__
+#  endif
+#endif
+#if defined(__MSDOS__) && !defined(MSDOS)
+#  define MSDOS
+#endif
 
 /*
  * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
  * than 64k bytes at a time (needed on systems with 16-bit int).
  */
-#if defined(_GNUC__) && !defined(__32BIT__)
-#  define __32BIT__
-#endif
-#if defined(__MSDOS__) && !defined(MSDOS)
-#  define MSDOS
-#endif
 #if defined(MSDOS) && !defined(__32BIT__)
 #  define MAXSEG_64K
 #endif
@@ -32,22 +70,32 @@
 #  define UNALIGNED_OK
 #endif
 
+#if (defined(MSDOS) || defined(_WINDOWS) || defined(WIN32))  && !defined(STDC)
+#  define STDC
+#endif
+#if defined(__STDC__) || defined(__cplusplus) || defined(__OS2__)
 #  ifndef STDC
-#  if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
 #    define STDC
 #  endif
 #endif
 
 #ifndef STDC
-#  ifndef const
+#  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
 #    define const
 #  endif
 #endif
 
-#ifdef	__MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
+/* Some Mac compilers merge all .h files incorrectly: */
-#  include <unix.h>
+#if defined(__MWERKS__) || defined(applec) ||defined(THINK_C) ||defined(__SC__)
+#  define NO_DUMMY_DECL
 #endif
 
+/* Borland C incorrectly complains about missing returns: */
+#if defined(__BORLANDC__)
+#  define NEED_DUMMY_RETURN
+#endif
+
+
 /* Maximum value for memLevel in deflateInit2 */
 #ifndef MAX_MEM_LEVEL
 #  ifdef MAXSEG_64K
@@ -57,13 +105,17 @@
 #  endif
 #endif
 
-/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
+/* Maximum value for windowBits in deflateInit2 and inflateInit2.
+ * WARNING: reducing MAX_WBITS makes minigzip unable to extract .gz files
+ * created by gzip. (Files created by minigzip can still be extracted by
+ * gzip.)
+ */
 #ifndef MAX_WBITS
 #  define MAX_WBITS   15 /* 32K LZ77 window */
 #endif
 
 /* The memory requirements for deflate are (in bytes):
-            1 << (windowBits+2)   +  1 << (memLevel+9)
+            (1 << (windowBits+2)) +  (1 << (memLevel+9))
  that is: 128K for windowBits=15  +  128K for memLevel = 8  (default values)
  plus a few kilobytes for small objects. For example, if you want to reduce
  the default memory requirements from 256K to 128K, compile with
@@ -85,17 +137,28 @@
 #  endif
 #endif
 
-#if defined(M_I86SM) || defined(M_I86MM) /* model independent MSC functions */
+/* The following definitions for FAR are needed only for MSDOS mixed
-#   define zstrcpy _fstrcpy
+ * model programming (small or medium model with some far allocations).
-#   define zstrcat _fstrcat
+ * This was tested only with MSC; for other MSDOS compilers you may have
-#   define zstrlen _fstrlen
+ * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
-#   define zstrcmp _fstrcmp
+ * just define FAR to be empty.
+ */
+#if (defined(M_I86SM) || defined(M_I86MM)) && !defined(__32BIT__)
+   /* MSC small or medium model */
+#  define SMALL_MEDIUM
+#  ifdef _MSC_VER
 #    define FAR __far
 #  else
-#   define zstrcpy strcpy
+#    define FAR far
-#   define zstrcat strcat
+#  endif
-#   define zstrlen strlen
+#endif
-#   define zstrcmp strcmp
+#if defined(__BORLANDC__) && (defined(__SMALL__) || defined(__MEDIUM__))
+#  ifndef __32BIT__
+#    define SMALL_MEDIUM
+#    define FAR __far
+#  endif
+#endif
+#ifndef FAR
 #   define FAR
 #endif
 
@@ -103,19 +166,82 @@ typedef unsigned char  Byte;  /* 8 bits */
 typedef unsigned int   uInt;  /* 16 bits or more */
 typedef unsigned long  uLong; /* 32 bits or more */
 
+#if defined(__BORLANDC__) && defined(SMALL_MEDIUM)
+   /* Borland C/C++ ignores FAR inside typedef */
+#  define Bytef Byte FAR
+#else
    typedef Byte  FAR Bytef;
+#endif
 typedef char  FAR charf;
 typedef int   FAR intf;
 typedef uInt  FAR uIntf;
 typedef uLong FAR uLongf;
 
 #ifdef STDC
-   typedef void FAR *voidp;
+   typedef void FAR *voidpf;
-   typedef void     *voidnp;
+   typedef void     *voidp;
 #else
-   typedef Byte FAR *voidp;
+   typedef Byte FAR *voidpf;
-   typedef Byte     *voidnp;
+   typedef Byte     *voidp;
+#endif
+
+#ifdef HAVE_UNISTD_H
+#  include <unistd.h> /* for SEEK_* and off_t */
+#  define z_off_t  off_t
+#endif
+#ifndef SEEK_SET
+#  define SEEK_SET        0       /* Seek from beginning of file.  */
+#  define SEEK_CUR        1       /* Seek from current position.  */
+#endif
+#ifndef z_off_t
+#  define  z_off_t long
+#endif
+
+/* Compile with -DZLIB_DLL for Windows DLL support */
+#if (defined(_WINDOWS) || defined(WINDOWS)) && defined(ZLIB_DLL)
+#  undef FAR
+#  include <windows.h>
+#  define EXPORT  WINAPI
+#  ifdef WIN32
+#    define EXPORTVA  WINAPIV
+#  else
+#    define EXPORTVA  FAR _cdecl _export
+#  endif
+#else
+#   if defined (__BORLANDC__) && defined (_Windows) && defined (__DLL__)
+#       define EXPORT _export
+#       define EXPORTVA _export
+#   else
+#       define EXPORT
+#       define EXPORTVA
+#   endif
+#endif
+
+/* MVS linker does not support external names larger than 8 bytes */
+#if defined(__MVS__)
+#   pragma map(deflateInit_,"DEIN")
+#   pragma map(deflateInit2_,"DEIN2")
+#   pragma map(deflateEnd,"DEEND")
+#   pragma map(inflateInit_,"ININ")
+#   pragma map(inflateInit2_,"ININ2")
+#   pragma map(inflateEnd,"INEND")
+#   pragma map(inflateSync,"INSY")
+#   pragma map(inflateSetDictionary,"INSEDI")
+#   pragma map(inflate_blocks,"INBL")
+#   pragma map(inflate_blocks_new,"INBLNE")
+#   pragma map(inflate_blocks_free,"INBLFR")
+#   pragma map(inflate_blocks_reset,"INBLRE")
+#   pragma map(inflate_codes_free,"INCOFR")
+#   pragma map(inflate_codes,"INCO")
+#   pragma map(inflate_fast,"INFA")
+#   pragma map(inflate_flush,"INFLU")
+#   pragma map(inflate_mask,"INMA")
+#   pragma map(inflate_set_dictionary,"INSEDI2")
+#   pragma map(inflate_copyright,"INCOPY")
+#   pragma map(inflate_trees_bits,"INTRBI")
+#   pragma map(inflate_trees_dynamic,"INTRDY")
+#   pragma map(inflate_trees_fixed,"INTRFI")
+#   pragma map(inflate_trees_free,"INTRFR")
 #endif
 
 #endif /* _ZCONF_H */
-

zlib.3

@@ -0,0 +1,107 @@
+.TH ZLIB 3 "20 January 1998"
+.SH NAME
+zlib \- compression/decompression library
+.SH SYNOPSIS
+[see
+.I zlib.h
+for full descripton]
+.SH DESCRIPTION
+The
+.I zlib
+library is a general purpose data compression library.
+The code is reentrant (thread safe).
+It provides in-memory compression and decompression functions,
+including integrity checks of the uncompressed data.
+This version of the library supports only one compression method (deflation)
+but other algorithms will be added later and will have the same stream interface.
+.LP
+Compression can be done in a single step if the buffers are large enough
+(for example if an input file is mmap'ed),
+or can be done by repeated calls of the compression function.
+In the latter case,
+the application must provide more input and/or consume the output
+(providing more output space) before each call.
+.LP
+The library also supports reading and writing files in
+.I gzip
+(.gz) format
+with an interface similar to that of stdio.
+.LP
+The library does not install any signal handler. The decoder checks
+the consistency of the compressed data, so the library should never
+crash even in case of corrupted input.
+.LP
+All functions of the compression library are documented in the file
+.IR zlib.h.
+The distribution source includes examples of use of the library
+the files
+.I example.c
+and
+.IR minigzip.c .
+.LP
+A Java implementation of
+.IR zlib
+is available in the Java Development Kit 1.1
+.IP
+http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
+.LP
+A Perl interface to
+.IR zlib ,
+written by Paul Marquess (pmarquess@bfsec.bt.co.uk)
+is available at CPAN (Comprehensive Perl Archive Network) sites,
+such as:
+.IP
+ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
+.LP
+A Python interface to
+.IR zlib
+written by A.M. Kuchling <amk@magnet.com>
+is available from the Python Software Association sites, such as:
+.IP
+ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
+.SH "SEE ALSO"
+Questions about zlib should be sent to:
+.IP
+zlib@quest.jpl.nasa.gov
+or, if this fails, to the author addresses given below.
+The zlib home page is:
+.IP
+http://www.cdrom.com/infozip/zlib/
+.LP
+The data format used by the zlib library is described by RFC
+(Request for Comments) 1950 to 1952 in the files: 
+.IP
+ftp://ds.internic.net/rfc/rfc1950.txt (zlib format)
+.br
+rfc1951.txt (deflate format)
+.br
+rfc1952.txt (gzip format)
+.LP
+These documents are also available in other formats from:
+.IP
+ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
+.SH AUTHORS
+Version 1.0.7.
+Copyright (C) 1995-1998 Jean-loup Gailly (jloup@gzip.org)
+and Mark Adler (madler@alumni.caltech.edu).
+.LP
+This software is provided "as-is,"
+without any express or implied warranty.
+In no event will the authors be held liable for any damages
+arising from the use of this software.
+See the distribution directory with respect to requirements
+governing redistribution.
+The deflate format used by
+.I zlib
+was defined by Phil Katz.
+The deflate and
+.I zlib
+specifications were written by Peter Deutsch.
+Thanks to all the people who reported problems and suggested various
+improvements in
+.IR zlib ;
+who are too numerous to cite here.
+.LP
+UNIX manual page by R. P. C. Rodgers,
+U.S. National Library of Medicine (rodgers@nlm.nih.gov).
+.\" end of man page

zlib.h

@@ -1,7 +1,7 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 0.94, Aug 13th, 1995.
+  version 1.0.7, Jan 20th, 1998
 
-  Copyright (C) 1995 Jean-loup Gailly and Mark Adler
+  Copyright (C) 1995-1998 Jean-loup Gailly and Mark Adler
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -20,37 +20,48 @@
   3. This notice may not be removed or altered from any source distribution.
 
   Jean-loup Gailly        Mark Adler
-  gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
+  jloup@gzip.org          madler@alumni.caltech.edu
+
+
+  The data format used by the zlib library is described by RFCs (Request for
+  Comments) 1950 to 1952 in the files ftp://ds.internic.net/rfc/rfc1950.txt
+  (zlib format), rfc1951.txt (deflate format) and rfc1952.txt (gzip format).
 */
 
 #ifndef _ZLIB_H
 #define _ZLIB_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 #include "zconf.h"
 
-#define ZLIB_VERSION "0.94"
+#define ZLIB_VERSION "1.0.7"
 
 /* 
      The 'zlib' compression library provides in-memory compression and
   decompression functions, including integrity checks of the uncompressed
   data.  This version of the library supports only one compression method
-  (deflation) but other algorithms may be added later and will have the same
+  (deflation) but other algorithms will be added later and will have the same
   stream interface.
 
-     For compression the application must provide the output buffer and
-  may optionally provide the input buffer for optimization. For decompression,
-  the application must provide the input buffer and may optionally provide
-  the output buffer for optimization.
-
      Compression can be done in a single step if the buffers are large
   enough (for example if an input file is mmap'ed), or can be done by
   repeated calls of the compression function.  In the latter case, the
   application must provide more input and/or consume the output
   (providing more output space) before each call.
+
+     The library also supports reading and writing files in gzip (.gz) format
+  with an interface similar to that of stdio.
+
+     The library does not install any signal handler. The decoder checks
+  the consistency of the compressed data, so the library should never
+  crash even in case of corrupted input.
 */
 
-typedef voidp (*alloc_func) OF((voidp opaque, uInt items, uInt size));
+typedef voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
-typedef void  (*free_func)  OF((voidp opaque, voidp address));
+typedef void   (*free_func)  OF((voidpf opaque, voidpf address));
 
 struct internal_state;
 
@@ -68,12 +79,15 @@ typedef struct z_stream_s {
 
     alloc_func zalloc;  /* used to allocate the internal state */
     free_func  zfree;   /* used to free the internal state */
-    voidp      opaque;  /* private data object passed to zalloc and zfree */
+    voidpf     opaque;  /* private data object passed to zalloc and zfree */
-
-    Byte     data_type; /* best guess about the data type: ascii or binary */
 
+    int     data_type;  /* best guess about the data type: ascii or binary */
+    uLong   adler;      /* adler32 value of the uncompressed data */
+    uLong   reserved;   /* reserved for future use */
 } z_stream;
 
+typedef z_stream FAR *z_streamp;
+
 /*
    The application must update next_in and avail_in when avail_in has
    dropped to zero. It must update next_out and avail_out when avail_out
@@ -106,21 +120,26 @@ typedef struct z_stream_s {
                         /* constants */
 
 #define Z_NO_FLUSH      0
-#define Z_PARTIAL_FLUSH 1
+#define Z_PARTIAL_FLUSH 1 /* will be removed, use Z_SYNC_FLUSH instead */
-#define Z_FULL_FLUSH    2
+#define Z_SYNC_FLUSH    2
-#define Z_SYNC_FLUSH    3 /* experimental: partial_flush + byte align */
+#define Z_FULL_FLUSH    3
 #define Z_FINISH        4
-/* See deflate() below for the usage of these constants */
+/* Allowed flush values; see deflate() below for details */
 
 #define Z_OK            0
 #define Z_STREAM_END    1
+#define Z_NEED_DICT     2
 #define Z_ERRNO        (-1)
 #define Z_STREAM_ERROR (-2)
 #define Z_DATA_ERROR   (-3)
 #define Z_MEM_ERROR    (-4)
 #define Z_BUF_ERROR    (-5)
-/* error codes for the compression/decompression functions */
+#define Z_VERSION_ERROR (-6)
+/* Return codes for the compression/decompression functions. Negative
+ * values are errors, positive values are used for special but normal events.
+ */
 
+#define Z_NO_COMPRESSION         0
 #define Z_BEST_SPEED             1
 #define Z_BEST_COMPRESSION       9
 #define Z_DEFAULT_COMPRESSION  (-1)
@@ -129,44 +148,62 @@ typedef struct z_stream_s {
 #define Z_FILTERED            1
 #define Z_HUFFMAN_ONLY        2
 #define Z_DEFAULT_STRATEGY    0
+/* compression strategy; see deflateInit2() below for details */
 
 #define Z_BINARY   0
 #define Z_ASCII    1
 #define Z_UNKNOWN  2
-/* Used to set the data_type field */
+/* Possible values of the data_type field */
+
+#define Z_DEFLATED   8
+/* The deflate compression method (the only one supported in this version) */
 
 #define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
 
-extern char *zlib_version;
+#define zlib_version zlibVersion()
-/* The application can compare zlib_version and ZLIB_VERSION for consistency.
+/* for compatibility with versions < 1.0.2 */
-   If the first character differs, the library code actually used is
-   not compatible with the zlib.h header file used by the application.
- */
 
                         /* basic functions */
 
-extern int deflateInit OF((z_stream *strm, int level));
+extern const char * EXPORT zlibVersion OF((void));
+/* The application can compare zlibVersion and ZLIB_VERSION for consistency.
+   If the first character differs, the library code actually used is
+   not compatible with the zlib.h header file used by the application.
+   This check is automatically made by deflateInit and inflateInit.
+ */
+
 /* 
+extern int EXPORT deflateInit OF((z_streamp strm, int level));
+
      Initializes the internal stream state for compression. The fields
    zalloc, zfree and opaque must be initialized before by the caller.
    If zalloc and zfree are set to Z_NULL, deflateInit updates them to
    use default allocation functions.
 
-     The compression level must be Z_DEFAULT_COMPRESSION, or between 1 and 9:
+     The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
-   1 gives best speed, 9 gives best compression. Z_DEFAULT_COMPRESSION requests
+   1 gives best speed, 9 gives best compression, 0 gives no compression at
-   a default compromise between speed and compression (currently equivalent
+   all (the input data is simply copied a block at a time).
-   to level 6).
+   Z_DEFAULT_COMPRESSION requests a default compromise between speed and
+   compression (currently equivalent to level 6).
 
      deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if level is not a valid compression level.
+   enough memory, Z_STREAM_ERROR if level is not a valid compression level,
+   Z_VERSION_ERROR if the zlib library version (zlib_version) is incompatible
+   with the version assumed by the caller (ZLIB_VERSION).
    msg is set to null if there is no error message.  deflateInit does not
    perform any compression: this will be done by deflate().
 */
 
 
-extern int deflate OF((z_stream *strm, int flush));
+extern int EXPORT deflate OF((z_streamp strm, int flush));
 /*
-  Performs one or both of the following actions:
+    deflate compresses as much data as possible, and stops when the input
+  buffer becomes empty or the output buffer becomes full. It may introduce some
+  output latency (reading input without producing any output) except when
+  forced to flush.
+
+    The detailed semantics are as follows. deflate performs one or both of the
+  following actions:
 
   - Compress more input starting at next_in and update next_in and avail_in
     accordingly. If not all input can be processed (because there is not
@@ -184,24 +221,30 @@ extern int deflate OF((z_stream *strm, int flush));
   more output, and updating avail_in or avail_out accordingly; avail_out
   should never be zero before the call. The application can consume the
   compressed output when it wants, for example when the output buffer is full
-  (avail_out == 0), or after each call of deflate().
+  (avail_out == 0), or after each call of deflate(). If deflate returns Z_OK
+  and with zero avail_out, it must be called again after making room in the
+  output buffer because there might be more output pending.
 
-    If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
+    If the parameter flush is set to Z_SYNC_FLUSH, all pending output is
-  block is terminated and flushed to the output buffer so that the
+  flushed to the output buffer and the output is aligned on a byte boundary, so
-  decompressor can get all input data available so far. For method 9, a future
+  that the decompressor can get all input data available so far. (In particular
-  variant on method 8, the current block will be flushed but not terminated.
+  avail_in is zero after the call if enough output space has been provided
-  If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
+  before the call.)  Flushing may degrade compression for some compression
-  special marker is output and the compression dictionary is discarded; this
+  algorithms and so it should be used only when necessary.
-  is useful to allow the decompressor to synchronize if one compressed block
-  has been damaged (see inflateSync below).  Flushing degrades compression and
-  so should be used only when necessary.  Using Z_FULL_FLUSH too often can
-  seriously degrade the compression. If deflate returns with avail_out == 0,
-  this function must be called again with the same value of the flush
-  parameter and more output space (updated avail_out), until the flush is
-  complete (deflate returns with non-zero avail_out).
 
-    If the parameter flush is set to Z_FINISH, all pending input is processed,
+    If flush is set to Z_FULL_FLUSH, all output is flushed as with
-  all pending output is flushed and deflate returns with Z_STREAM_END if there
+  Z_SYNC_FLUSH, and the compression state is reset so that decompression can
+  restart from this point if previous compressed data has been damaged or if
+  random access is desired. Using Z_FULL_FLUSH too often can seriously degrade
+  the compression.
+
+    If deflate returns with avail_out == 0, this function must be called again
+  with the same value of the flush parameter and more output space (updated
+  avail_out), until the flush is complete (deflate returns with non-zero
+  avail_out).
+
+    If the parameter flush is set to Z_FINISH, pending input is processed,
+  pending output is flushed and deflate returns with Z_STREAM_END if there
   was enough output space; if deflate returns with Z_OK, this function must be
   called again with Z_FINISH and more output space (updated avail_out) but no
   more input data, until it returns with Z_STREAM_END or an error. After
@@ -213,6 +256,9 @@ extern int deflate OF((z_stream *strm, int flush));
   0.1% larger than avail_in plus 12 bytes.  If deflate does not return
   Z_STREAM_END, then it must be called again as described above.
 
+    deflate() sets strm->adler to the adler32 checksum of all input read
+  so far (that is, total_in bytes).
+
     deflate() may update data_type if it can make a good guess about
   the input data type (Z_ASCII or Z_BINARY). In doubt, the data is considered
   binary. This field is only for information purposes and does not affect
@@ -226,35 +272,50 @@ extern int deflate OF((z_stream *strm, int flush));
 */
 
 
-extern int deflateEnd OF((z_stream *strm));
+extern int EXPORT deflateEnd OF((z_streamp strm));
 /*
      All dynamically allocated data structures for this stream are freed.
    This function discards any unprocessed input and does not flush any
    pending output.
 
      deflateEnd returns Z_OK if success, Z_STREAM_ERROR if the
-   stream state was inconsistent. In the error case, msg may be set
+   stream state was inconsistent, Z_DATA_ERROR if the stream was freed
-   but then points to a static string (which must not be deallocated).
+   prematurely (some input or output was discarded). In the error case,
+   msg may be set but then points to a static string (which must not be
+   deallocated).
 */
 
 
-extern int inflateInit OF((z_stream *strm));
 /* 
+extern int EXPORT inflateInit OF((z_streamp strm));
+
      Initializes the internal stream state for decompression. The fields
-   zalloc and zfree must be initialized before by the caller.  If zalloc and
+   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
-   zfree are set to Z_NULL, inflateInit updates them to use default allocation
+   the caller. If next_in is not Z_NULL and avail_in is large enough (the exact
-   functions.
+   value depends on the compression method), inflateInit determines the
+   compression method from the zlib header and allocates all data structures
+   accordingly; otherwise the allocation will be deferred to the first call of
+   inflate.  If zalloc and zfree are set to Z_NULL, inflateInit updates them to
+   use default allocation functions.
 
-     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
+     inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   enough memory.  msg is set to null if there is no error message.
+   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
-   inflateInit does not perform any decompression: this will be done by
+   version assumed by the caller.  msg is set to null if there is no error
-   inflate().
+   message. inflateInit does not perform any decompression apart from reading
+   the zlib header if present: this will be done by inflate().  (So next_in and
+   avail_in may be modified, but next_out and avail_out are unchanged.)
 */
 
 
-extern int inflate OF((z_stream *strm, int flush));
+extern int EXPORT inflate OF((z_streamp strm, int flush));
 /*
-  Performs one or both of the following actions:
+    inflate decompresses as much data as possible, and stops when the input
+  buffer becomes empty or the output buffer becomes full. It may some
+  introduce some output latency (reading input without producing any output)
+  except when forced to flush.
+
+  The detailed semantics are as follows. inflate performs one or both of the
+  following actions:
 
   - Decompress more input starting at next_in and update next_in and avail_in
     accordingly. If not all input can be processed (because there is not
@@ -262,19 +323,22 @@ extern int inflate OF((z_stream *strm, int flush));
     will resume at this point for the next call of inflate().
 
   - Provide more output starting at next_out and update next_out and avail_out
-    accordingly.  inflate() always provides as much output as possible
+    accordingly.  inflate() provides as much output as possible, until there
-    (until there is no more input data or no more space in the output buffer).
+    is no more input data or no more space in the output buffer (see below
+    about the flush parameter).
 
   Before the call of inflate(), the application should ensure that at least
   one of the actions is possible, by providing more input and/or consuming
   more output, and updating the next_* and avail_* values accordingly.
   The application can consume the uncompressed output when it wants, for
   example when the output buffer is full (avail_out == 0), or after each
-  call of inflate().
+  call of inflate(). If inflate returns Z_OK and with zero avail_out, it
+  must be called again after making room in the output buffer because there
+  might be more output pending.
 
-    If the parameter flush is set to Z_PARTIAL_FLUSH, inflate flushes as much
+    If the parameter flush is set to Z_SYNC_FLUSH, inflate flushes as much
   output as possible to the output buffer. The flushing behavior of inflate is
-  not specified for values of the flush parameter other than Z_PARTIAL_FLUSH
+  not specified for values of the flush parameter other than Z_SYNC_FLUSH
   and Z_FINISH, but the current implementation actually flushes as much output
   as possible anyway.
 
@@ -289,19 +353,30 @@ extern int inflate OF((z_stream *strm, int flush));
   is never required, but can be used to inform inflate that a faster routine
   may be used for the single inflate() call.
 
-    inflate() returns Z_OK if some progress has been made (more input
+     If a preset dictionary is needed at this point (see inflateSetDictionary
-  processed or more output produced), Z_STREAM_END if the end of the
+  below), inflate sets strm-adler to the adler32 checksum of the
-  compressed data has been reached and all uncompressed output has been
+  dictionary chosen by the compressor and returns Z_NEED_DICT; otherwise 
-  produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
+  it sets strm->adler to the adler32 checksum of all output produced
-  the stream structure was inconsistent (for example if next_in or next_out
+  so far (that is, total_out bytes) and returns Z_OK, Z_STREAM_END or
-  was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
+  an error code as described below. At the end of the stream, inflate()
-  progress is possible or if there was not enough room in the output buffer
+  checks that its computed adler32 checksum is equal to that saved by the
-  when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
+  compressor and returns Z_STREAM_END only if the checksum is correct.
-  call inflateSync to look for a good compression block.
+
+    inflate() returns Z_OK if some progress has been made (more input processed
+  or more output produced), Z_STREAM_END if the end of the compressed data has
+  been reached and all uncompressed output has been produced, Z_NEED_DICT if a
+  preset dictionary is needed at this point, Z_DATA_ERROR if the input data was
+  corrupted (input stream not conforming to the zlib format or incorrect
+  adler32 checksum), Z_STREAM_ERROR if the stream structure was inconsistent
+  (for example if next_in or next_out was NULL), Z_MEM_ERROR if there was not
+  enough memory, Z_BUF_ERROR if no progress is possible or if there was not
+  enough room in the output buffer when Z_FINISH is used. In the Z_DATA_ERROR
+  case, the application may then call inflateSync to look for a good
+  compression block.
 */
 
 
-extern int inflateEnd OF((z_stream *strm));
+extern int EXPORT inflateEnd OF((z_streamp strm));
 /*
      All dynamically allocated data structures for this stream are freed.
    This function discards any unprocessed input and does not flush any
@@ -312,31 +387,32 @@ extern int inflateEnd OF((z_stream *strm));
    static string (which must not be deallocated).
 */
 
-                        /* advanced functions */
+                        /* Advanced functions */
 
 /*
     The following functions are needed only in some special applications.
 */
 
-extern int deflateInit2 OF((z_stream *strm,
+/*   
+extern int EXPORT deflateInit2 OF((z_streamp strm,
                                    int  level,
                                    int  method,
                                    int  windowBits,
                                    int  memLevel,
                                    int  strategy));
-/*   
-     This is another version of deflateInit with more compression options. The
-   fields next_in, zalloc and zfree must be initialized before by the caller.
 
-     The method parameter is the compression method. It must be 8 in this
+     This is another version of deflateInit with more compression options. The
-   version of the library. (Method 9 will allow a 64K history buffer and
+   fields next_in, zalloc, zfree and opaque must be initialized before by
-   partial block flushes.)
+   the caller.
+
+     The method parameter is the compression method. It must be Z_DEFLATED in
+   this version of the library.
 
      The windowBits parameter is the base two logarithm of the window size
    (the size of the history buffer).  It should be in the range 8..15 for this
-   version of the library (the value 16 will be allowed for method 9). Larger
+   version of the library. Larger values of this parameter result in better
-   values of this parameter result in better compression at the expense of
+   compression at the expense of memory usage. The default value is 15 if
-   memory usage. The default value is 15 if deflateInit is used instead.
+   deflateInit is used instead.
 
      The memLevel parameter specifies how much memory should be allocated
    for the internal compression state. memLevel=1 uses minimum memory but
@@ -344,46 +420,65 @@ extern int deflateInit2 OF((z_stream *strm,
    for optimal speed. The default value is 8. See zconf.h for total memory
    usage as a function of windowBits and memLevel.
 
-     The strategy parameter is used to tune the compression algorithm. Use
+     The strategy parameter is used to tune the compression algorithm. Use the
-   the value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data
+   value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data produced by a
-   produced by a filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman
+   filter (or predictor), or Z_HUFFMAN_ONLY to force Huffman encoding only (no
-   encoding only (no string match).  Filtered data consists mostly of small
+   string match).  Filtered data consists mostly of small values with a
-   values with a somewhat random distribution. In this case, the
+   somewhat random distribution. In this case, the compression algorithm is
-   compression algorithm is tuned to compress them better. The strategy
+   tuned to compress them better. The effect of Z_FILTERED is to force more
-   parameter only affects the compression ratio but not the correctness of
+   Huffman coding and less string matching; it is somewhat intermediate
-   the compressed output even if it is not set appropriately.
+   between Z_DEFAULT and Z_HUFFMAN_ONLY. The strategy parameter only affects
+   the compression ratio but not the correctness of the compressed output even
+   if it is not set appropriately.
 
-     If next_in is not null, the library will use this buffer to hold also
+      deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   some history information; the buffer must either hold the entire input
+   memory, Z_STREAM_ERROR if a parameter is invalid (such as an invalid
-   data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
+   method). msg is set to null if there is no error message.  deflateInit2 does
-   is null, the library will allocate its own history buffer (and leave next_in
+   not perform any compression: this will be done by deflate().
-   null). next_out need not be provided here but must be provided by the
-   application for the next call of deflate().
-
-     If the history buffer is provided by the application, next_in must
-   must never be changed by the application since the compressor maintains
-   information inside this buffer from call to call; the application
-   must provide more input only by increasing avail_in. next_in is always
-   reset by the library in this case.
-
-      deflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
-   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
-   an invalid method). msg is set to null if there is no error message.
-   deflateInit2 does not perform any compression: this will be done by
-   deflate().
 */
                             
-extern int deflateCopy OF((z_stream *dest,
+extern int EXPORT deflateSetDictionary OF((z_streamp strm,
-                           z_stream *source));
+                                           const Bytef *dictionary,
+				           uInt  dictLength));
 /*
-     Sets the destination stream as a complete copy of the source stream.  If
+     Initializes the compression dictionary from the given byte sequence
-   the source stream is using an application-supplied history buffer, a new
+   without producing any compressed output. This function must be called
-   buffer is allocated for the destination stream.  The compressed output
+   immediately after deflateInit or deflateInit2, before any call of
-   buffer is always application-supplied. It's the responsibility of the
+   deflate. The compressor and decompressor must use exactly the same
-   application to provide the correct values of next_out and avail_out for the
+   dictionary (see inflateSetDictionary).
-   next call of deflate.
 
-     This function is useful when several compression strategies will be
+     The dictionary should consist of strings (byte sequences) that are likely
+   to be encountered later in the data to be compressed, with the most commonly
+   used strings preferably put towards the end of the dictionary. Using a
+   dictionary is most useful when the data to be compressed is short and can be
+   predicted with good accuracy; the data can then be compressed better than
+   with the default empty dictionary.
+
+     Depending on the size of the compression data structures selected by
+   deflateInit or deflateInit2, a part of the dictionary may in effect be
+   discarded, for example if the dictionary is larger than the window size in
+   deflate or deflate2. Thus the strings most likely to be useful should be
+   put at the end of the dictionary, not at the front.
+
+     Upon return of this function, strm->adler is set to the Adler32 value
+   of the dictionary; the decompressor may later use this value to determine
+   which dictionary has been used by the compressor. (The Adler32 value
+   applies to the whole dictionary even if only a subset of the dictionary is
+   actually used by the compressor.)
+
+     deflateSetDictionary returns Z_OK if success, or Z_STREAM_ERROR if a
+   parameter is invalid (such as NULL dictionary) or the stream state is
+   inconsistent (for example if deflate has already been called for this stream
+   or if the compression method is bsort). deflateSetDictionary does not
+   perform any compression: this will be done by deflate().
+*/
+
+extern int EXPORT deflateCopy OF((z_streamp dest,
+                                  z_streamp source));
+/*
+     Sets the destination stream as a complete copy of the source stream.
+
+     This function can be useful when several compression strategies will be
    tried, for example when there are several ways of pre-processing the input
    data with a filter. The streams that will be discarded should then be freed
    by calling deflateEnd.  Note that deflateCopy duplicates the internal
@@ -396,7 +491,7 @@ extern int deflateCopy OF((z_stream *dest,
    destination.
 */
 
-extern int deflateReset OF((z_stream *strm));
+extern int EXPORT deflateReset OF((z_streamp strm));
 /*
      This function is equivalent to deflateEnd followed by deflateInit,
    but does not free and reallocate all the internal compression state.
@@ -407,47 +502,75 @@ extern int deflateReset OF((z_stream *strm));
    stream state was inconsistent (such as zalloc or state being NULL).
 */
 
-extern int inflateInit2 OF((z_stream *strm,
+extern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy));
-                            int  windowBits));
 /*
-     This is another version of inflateInit with more compression options. The
+     Dynamically update the compression level and compression strategy.  The
-   fields next_out, zalloc and zfree must be initialized before by the caller.
+   interpretation of level and strategy is as in deflateInit2.  This can be
+   used to switch between compression and straight copy of the input data, or
+   to switch to a different kind of input data requiring a different
+   strategy. If the compression level is changed, the input available so far
+   is compressed with the old level (and may be flushed); the new level will
+   take effect only at the next call of deflate().
+
+     Before the call of deflateParams, the stream state must be set as for
+   a call of deflate(), since the currently available input may have to
+   be compressed and flushed. In particular, strm->avail_out must be non-zero.
+
+     deflateParams returns Z_OK if success, Z_STREAM_ERROR if the source
+   stream state was inconsistent or if a parameter was invalid, Z_BUF_ERROR
+   if strm->avail_out was zero.
+*/
+
+/*   
+extern int EXPORT inflateInit2 OF((z_streamp strm,
+                                   int  windowBits));
+
+     This is another version of inflateInit with an extra parameter. The
+   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
+   before by the caller.
 
      The windowBits parameter is the base two logarithm of the maximum window
    size (the size of the history buffer).  It should be in the range 8..15 for
-   this version of the library (the value 16 will be allowed soon). The
+   this version of the library. The default value is 15 if inflateInit is used
-   default value is 15 if inflateInit is used instead. If a compressed stream
+   instead. If a compressed stream with a larger window size is given as
-   with a larger window size is given as input, inflate() will return with
+   input, inflate() will return with the error code Z_DATA_ERROR instead of
-   the error code Z_DATA_ERROR instead of trying to allocate a larger window.
+   trying to allocate a larger window.
 
-     If next_out is not null, the library will use this buffer for the history
+      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-   buffer; the buffer must either be large enough to hold the entire output
+   memory, Z_STREAM_ERROR if a parameter is invalid (such as a negative
-   data, or have at least 1<<windowBits bytes.  If next_out is null, the
+   memLevel). msg is set to null if there is no error message.  inflateInit2
-   library will allocate its own buffer (and leave next_out null). next_in
+   does not perform any decompression apart from reading the zlib header if
-   need not be provided here but must be provided by the application for the
+   present: this will be done by inflate(). (So next_in and avail_in may be
-   next call of inflate().
+   modified, but next_out and avail_out are unchanged.)
+*/
 
-     If the history buffer is provided by the application, next_out must
+extern int EXPORT inflateSetDictionary OF((z_streamp strm,
-   never be changed by the application since the decompressor maintains
+				           const Bytef *dictionary,
-   history information inside this buffer from call to call; the application
+					   uInt  dictLength));
-   can only reset next_out to the beginning of the history buffer when
+/*
-   avail_out is zero and all output has been consumed.
+     Initializes the decompression dictionary from the given uncompressed byte
+   sequence. This function must be called immediately after a call of inflate
+   if this call returned Z_NEED_DICT. The dictionary chosen by the compressor
+   can be determined from the Adler32 value returned by this call of
+   inflate. The compressor and decompressor must use exactly the same
+   dictionary (see deflateSetDictionary).
 
-      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
+     inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
-   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
+   parameter is invalid (such as NULL dictionary) or the stream state is
-   windowBits < 8). msg is set to null if there is no error message.
+   inconsistent, Z_DATA_ERROR if the given dictionary doesn't match the
-   inflateInit2 does not perform any decompression: this will be done by
+   expected one (incorrect Adler32 value). inflateSetDictionary does not
+   perform any decompression: this will be done by subsequent calls of
    inflate().
 */
 
-extern int inflateSync OF((z_stream *strm));
+extern int EXPORT inflateSync OF((z_streamp strm));
 /* 
-    Skips invalid compressed data until the special marker (see deflate()
+    Skips invalid compressed data until a full flush point (see above the
-  above) can be found, or until all available input is skipped. No output
+  description of deflate with Z_FULL_FLUSH) can be found, or until all
-  is provided.
+  available input is skipped. No output is provided.
 
-    inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
+    inflateSync returns Z_OK if a full flush point has been found, Z_BUF_ERROR
-  if no more input was provided, Z_DATA_ERROR if no marker has been found,
+  if no more input was provided, Z_DATA_ERROR if no flush point has been found,
   or Z_STREAM_ERROR if the stream structure was inconsistent. In the success
   case, the application may save the current current value of total_in which
   indicates where valid compressed data was found. In the error case, the
@@ -455,7 +578,7 @@ extern int inflateSync OF((z_stream *strm));
   until success or end of the input data.
 */
 
-extern int inflateReset OF((z_stream *strm));
+extern int EXPORT inflateReset OF((z_streamp strm));
 /*
      This function is equivalent to inflateEnd followed by inflateInit,
    but does not free and reallocate all the internal decompression state.
@@ -471,13 +594,13 @@ extern int inflateReset OF((z_stream *strm));
 /*
      The following utility functions are implemented on top of the
    basic stream-oriented functions. To simplify the interface, some
-   default options are assumed (compression level, window size,
+   default options are assumed (compression level and memory usage,
    standard memory allocation functions). The source code of these
    utility functions can easily be modified if you need special options.
 */
 
-extern int compress OF((Bytef *dest,   uLongf *destLen,
+extern int EXPORT compress OF((Bytef *dest,   uLongf *destLen,
-                        Bytef *source, uLong sourceLen));
+			       const Bytef *source, uLong sourceLen));
 /*
      Compresses the source buffer into the destination buffer.  sourceLen is
    the byte length of the source buffer. Upon entry, destLen is the total
@@ -491,8 +614,8 @@ extern int compress OF((Bytef *dest,   uLongf *destLen,
    buffer.
 */
 
-extern int uncompress OF((Bytef *dest,   uLongf *destLen,
+extern int EXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
-                          Bytef *source, uLong sourceLen));
+				 const Bytef *source, uLong sourceLen));
 /*
      Decompresses the source buffer into the destination buffer.  sourceLen is
    the byte length of the source buffer. Upon entry, destLen is the total
@@ -510,30 +633,46 @@ extern int uncompress OF((Bytef *dest,   uLongf *destLen,
 */
 
 
-typedef voidnp gzFile;
+typedef voidp gzFile;
 
-extern gzFile gzopen  OF((char *path, char *mode));
+extern gzFile EXPORT gzopen  OF((const char *path, const char *mode));
 /*
      Opens a gzip (.gz) file for reading or writing. The mode parameter
    is as in fopen ("rb" or "wb") but can also include a compression level
-   ("wb9").  gzopen can be used to read a file which is not in gzip format;
+   ("wb9") or a strategy: 'f' for filtered data as in "wb6f", 'h' for
-   in this case gzread will directly read from the file without decompression.
+   Huffman only compression as in "wb1h". (See the description
+   of deflateInit2 for more information about the strategy parameter.)
+
+     gzopen can be used to read a file which is not in gzip format; in this
+   case gzread will directly read from the file without decompression.
+
      gzopen returns NULL if the file could not be opened or if there was
    insufficient memory to allocate the (de)compression state; errno
    can be checked to distinguish the two cases (if errno is zero, the
-   zlib error is Z_MEM_ERROR).
+   zlib error is Z_MEM_ERROR).  */
-*/
 
-extern gzFile gzdopen  OF((int fd, char *mode));
+extern gzFile EXPORT gzdopen  OF((int fd, const char *mode));
 /*
      gzdopen() associates a gzFile with the file descriptor fd.  File
-   descriptors are obtained from calls like open, dup, creat, or pipe.
+   descriptors are obtained from calls like open, dup, creat, pipe or
-   The mode parameter is as in fopen ("rb" or "wb").
+   fileno (in the file has been previously opened with fopen).
+   The mode parameter is as in gzopen.
+     The next call of gzclose on the returned gzFile will also close the
+   file descriptor fd, just like fclose(fdopen(fd), mode) closes the file
+   descriptor fd. If you want to keep fd open, use gzdopen(dup(fd), mode).
      gzdopen returns NULL if there was insufficient memory to allocate
    the (de)compression state.
 */
 
-extern int    gzread  OF((gzFile file, voidnp buf, unsigned len));
+extern int EXPORT gzsetparams OF((gzFile file, int level, int strategy));
+/*
+     Dynamically update the compression level or strategy. See the description
+   of deflateInit2 for the meaning of these parameters.
+     gzsetparams returns Z_OK if success, or Z_STREAM_ERROR if the file was not
+   opened for writing.
+*/
+
+extern int EXPORT    gzread  OF((gzFile file, voidp buf, unsigned len));
 /*
      Reads the given number of uncompressed bytes from the compressed file.
    If the input file was not in gzip format, gzread copies the given number
@@ -541,14 +680,33 @@ extern int    gzread  OF((gzFile file, voidnp buf, unsigned len));
      gzread returns the number of uncompressed bytes actually read (0 for
    end of file, -1 for error). */
 
-extern int    gzwrite OF((gzFile file, voidnp buf, unsigned len));
+extern int EXPORT    gzwrite OF((gzFile file, const voidp buf, unsigned len));
 /*
      Writes the given number of uncompressed bytes into the compressed file.
    gzwrite returns the number of uncompressed bytes actually written
    (0 in case of error).
 */
 
-extern int    gzflush OF((gzFile file, int flush));
+extern int EXPORTVA   gzprintf OF((gzFile file, const char *format, ...));
+/*
+     Converts, formats, and writes the args to the compressed file under
+   control of the format string, as in fprintf. gzprintf returns the number of
+   uncompressed bytes actually written (0 in case of error).
+*/
+
+extern int EXPORT    gzputc OF((gzFile file, int c));
+/*
+      Writes c, converted to an unsigned char, into the compressed file.
+   gzputc returns the value that was written, or -1 in case of error.
+*/
+
+extern int EXPORT    gzgetc OF((gzFile file));
+/*
+      Reads one byte from the compressed file. gzgetc returns this byte
+   or -1 in case of end of file or error.
+*/
+
+extern int EXPORT    gzflush OF((gzFile file, int flush));
 /*
      Flushes all pending output into the compressed file. The parameter
    flush is as in the deflate() function. The return value is the zlib
@@ -558,14 +716,53 @@ extern int    gzflush OF((gzFile file, int flush));
    degrade compression.
 */
 
-extern int    gzclose OF((gzFile file));
+extern z_off_t EXPORT    gzseek OF((gzFile file, z_off_t offset, int whence));
+/* 
+      Sets the starting position for the next gzread or gzwrite on the given
+   compressed file. The offset represents a number of bytes in the
+   uncompressed data stream. The whence parameter is defined as in lseek(2);
+   the value SEEK_END is not supported.
+     If the file is opened for reading, this function is emulated but can be
+   extremely slow. If the file is opened for writing, only forward seeks are
+   supported; gzseek then compresses a sequence of zeroes up to the new
+   starting position.
+
+      gzseek returns the resulting offset location as measured in bytes from
+   the beginning of the uncompressed stream, or -1 in case of error, in
+   particular if the file is opened for writing and the new starting position
+   would be before the current position.
+*/
+
+extern int EXPORT    gzrewind OF((gzFile file));
+/*
+     Rewinds the given file. This function is supported only for reading.
+
+   gzrewind(file) is equivalent to (int)gzseek(file, 0L, SEEK_SET)
+*/
+
+extern z_off_t EXPORT    gztell OF((gzFile file));
+/*
+     Returns the starting position for the next gzread or gzwrite on the
+   given compressed file. This position represents a number of bytes in the
+   uncompressed data stream.
+
+   gztell(file) is equivalent to gzseek(file, 0L, SEEK_CUR)
+*/
+
+extern int EXPORT gzeof OF((gzFile file));
+/*
+     Returns 1 when EOF has previously been detected reading the given
+   input stream, otherwise zero.
+*/
+
+extern int EXPORT    gzclose OF((gzFile file));
 /*
      Flushes all pending output if necessary, closes the compressed file
    and deallocates all the (de)compression state. The return value is the zlib
    error number (see function gzerror below).
 */
 
-extern char*   gzerror OF((gzFile file, int *errnum));
+extern const char * EXPORT gzerror OF((gzFile file, int *errnum));
 /*
      Returns the error message for the last error which occurred on the
    given compressed file. errnum is set to zlib error number. If an
@@ -582,7 +779,7 @@ extern char*   gzerror OF((gzFile file, int *errnum));
    compression library.
 */
 
-extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
+extern uLong EXPORT adler32 OF((uLong adler, const Bytef *buf, uInt len));
 
 /*
      Update a running Adler-32 checksum with the bytes buf[0..len-1] and
@@ -599,7 +796,7 @@ extern uLong adler32 OF((uLong adler, Bytef *buf, uInt len));
      if (adler != original_adler) error();
 */
 
-extern uLong crc32   OF((uLong crc, Bytef *buf, uInt len));
+extern uLong EXPORT crc32   OF((uLong crc, const Bytef *buf, uInt len));
 /*
      Update a running crc with the bytes buf[0..len-1] and return the updated
    crc. If buf is NULL, this function returns the required initial value
@@ -615,8 +812,42 @@ extern uLong crc32   OF((uLong crc, Bytef *buf, uInt len));
      if (crc != original_crc) error();
 */
 
-#ifndef _Z_UTIL_H
+
+                        /* various hacks, don't look :) */
+
+/* deflateInit and inflateInit are macros to allow checking the zlib version
+ * and the compiler's view of z_stream:
+ */
+extern int EXPORT deflateInit_ OF((z_streamp strm, int level,
+			           const char *version, int stream_size));
+extern int EXPORT inflateInit_ OF((z_streamp strm,
+				   const char *version, int stream_size));
+extern int EXPORT deflateInit2_ OF((z_streamp strm, int  level, int  method,
+				    int windowBits, int memLevel, int strategy,
+				    const char *version, int stream_size));
+extern int EXPORT inflateInit2_ OF((z_streamp strm, int  windowBits,
+				    const char *version, int stream_size));
+#define deflateInit(strm, level) \
+        deflateInit_((strm), (level),       ZLIB_VERSION, sizeof(z_stream))
+#define inflateInit(strm) \
+        inflateInit_((strm),                ZLIB_VERSION, sizeof(z_stream))
+#define deflateInit2(strm, level, method, windowBits, memLevel, strategy) \
+        deflateInit2_((strm),(level),(method),(windowBits),(memLevel),\
+		      (strategy),           ZLIB_VERSION, sizeof(z_stream))
+#define inflateInit2(strm, windowBits) \
+        inflateInit2_((strm), (windowBits), ZLIB_VERSION, sizeof(z_stream))
+
+
+#if !defined(_Z_UTIL_H) && !defined(NO_DUMMY_DECL)
     struct internal_state {int dummy;}; /* hack for buggy compilers */
 #endif
 
+extern const char * EXPORT zError           OF((int err));
+extern int          EXPORT inflateSyncPoint OF((z_streamp z));
+extern uLongf *     EXPORT get_crc_table    OF((void));
+
+#ifdef __cplusplus
+}
+#endif
+
 #endif /* _ZLIB_H */

zutil.c

@@ -1,9 +1,9 @@
 /* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zutil.c,v 1.8 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 
@@ -11,13 +11,12 @@
 
 struct internal_state      {int dummy;}; /* for buggy compilers */
 
-#ifndef __GO32__
+#ifndef STDC
 extern void exit OF((int));
 #endif
 
-char *zlib_version = ZLIB_VERSION;
+const char *z_errmsg[10] = {
-
+"need dictionary",     /* Z_NEED_DICT       2  */
-char *z_errmsg[] = {
 "stream end",          /* Z_STREAM_END      1  */
 "",                    /* Z_OK              0  */
 "file error",          /* Z_ERRNO         (-1) */
@@ -25,21 +24,45 @@ char *z_errmsg[] = {
 "data error",          /* Z_DATA_ERROR    (-3) */
 "insufficient memory", /* Z_MEM_ERROR     (-4) */
 "buffer error",        /* Z_BUF_ERROR     (-5) */
+"incompatible version",/* Z_VERSION_ERROR (-6) */
 ""};
 
 
+const char * EXPORT zlibVersion()
+{
+    return ZLIB_VERSION;
+}
+
+#ifdef DEBUG
+
+#  ifndef verbose
+#    define verbose 0
+#  endif
+int z_verbose = verbose;
+
 void z_error (m)
     char *m;
 {
     fprintf(stderr, "%s\n", m);
     exit(1);
 }
+#endif
+
+/* exported to allow conversion of error code to string for compress() and
+ * uncompress()
+ */
+const char * EXPORT zError(err)
+    int err;
+{
+    return ERR_MSG(err);
+}
+
 
 #ifndef HAVE_MEMCPY
 
 void zmemcpy(dest, source, len)
-    Byte* dest;
+    Bytef* dest;
-    Byte* source;
+    Bytef* source;
     uInt  len;
 {
     if (len == 0) return;
@@ -48,8 +71,21 @@ void zmemcpy(dest, source, len)
     } while (--len != 0);
 }
 
+int zmemcmp(s1, s2, len)
+    Bytef* s1;
+    Bytef* s2;
+    uInt  len;
+{
+    uInt j;
+
+    for (j = 0; j < len; j++) {
+        if (s1[j] != s2[j]) return 2*(s1[j] > s2[j])-1;
+    }
+    return 0;
+}
+
 void zmemzero(dest, len)
-    Byte* dest;
+    Bytef* dest;
     uInt  len;
 {
     if (len == 0) return;
@@ -59,8 +95,11 @@ void zmemzero(dest, len)
 }
 #endif
 
-#if defined(__TURBOC__) && !defined(__SMALL__)
+#ifdef __TURBOC__
-
+#if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
+/* Small and medium model in Turbo C are for now limited to near allocation
+ * with reduced MAX_WBITS and MAX_MEM_LEVEL
+ */
 #  define MY_ZCALLOC
 
 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
@@ -75,8 +114,8 @@ void zmemzero(dest, len)
 local int next_ptr = 0;
 
 typedef struct ptr_table_s {
-    voidp org_ptr;
+    voidpf org_ptr;
-    voidp new_ptr;
+    voidpf new_ptr;
 } ptr_table;
 
 local ptr_table table[MAX_PTR];
@@ -87,12 +126,15 @@ local ptr_table table[MAX_PTR];
  * a protected system like OS/2. Use Microsoft C instead.
  */
 
-voidp zcalloc (voidp opaque, unsigned items, unsigned size)
+voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 {
-    voidp buf = opaque; /* just to make some compilers happy */
+    voidpf buf = opaque; /* just to make some compilers happy */
     ulg bsize = (ulg)items*size;
 
-    if (bsize < 65536L) {
+    /* If we allocate less than 65520 bytes, we assume that farmalloc
+     * will return a usable pointer which doesn't have to be normalized.
+     */
+    if (bsize < 65520L) {
         buf = farmalloc(bsize);
         if (*(ush*)&buf != 0) return buf;
     } else {
@@ -108,7 +150,7 @@ voidp zcalloc (voidp opaque, unsigned items, unsigned size)
     return buf;
 }
 
-void  zcfree (voidp opaque, voidp ptr)
+void  zcfree (voidpf opaque, voidpf ptr)
 {
     int n;
     if (*(ush*)&ptr != 0) { /* object < 64K */
@@ -127,11 +169,14 @@ void  zcfree (voidp opaque, voidp ptr)
         return;
     }
     ptr = opaque; /* just to make some compilers happy */
-    z_error("zcfree: ptr not found");
+    Assert(0, "zcfree: ptr not found");
 }
+#endif
 #endif /* __TURBOC__ */
 
-#if defined(MSDOS) && !defined(__TURBOC__)  /* MSC */
+
+#if defined(M_I86) && !defined(__32BIT__)
+/* Microsoft C in 16-bit mode */
 
 #  define MY_ZCALLOC
 
@@ -140,13 +185,13 @@ void  zcfree (voidp opaque, voidp ptr)
 #  define _hfree   hfree
 #endif
 
-voidp zcalloc (voidp opaque, unsigned items, unsigned size)
+voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
 {
     if (opaque) opaque = 0; /* to make compiler happy */
     return _halloc((long)items, size);
 }
 
-void  zcfree (voidp opaque, voidp ptr)
+void  zcfree (voidpf opaque, voidpf ptr)
 {
     if (opaque) opaque = 0; /* to make compiler happy */
     _hfree(ptr);
@@ -157,24 +202,26 @@ void  zcfree (voidp opaque, voidp ptr)
 
 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
 
-#ifndef __GO32__
+#ifndef STDC
 extern voidp  calloc OF((uInt items, uInt size));
-extern void  free   OF((voidp ptr));
+extern void   free   OF((voidpf ptr));
 #endif
 
-voidp zcalloc (opaque, items, size)
+voidpf zcalloc (opaque, items, size)
-    voidp opaque;
+    voidpf opaque;
     unsigned items;
     unsigned size;
 {
-    return calloc(items, size);
+    if (opaque) items += size - size; /* make compiler happy */
+    return (voidpf)calloc(items, size);
 }
 
 void  zcfree (opaque, ptr)
-    voidp opaque;
+    voidpf opaque;
-    voidp ptr;
+    voidpf ptr;
 {
     free(ptr);
+    if (opaque) return; /* make compiler happy */
 }
 
 #endif /* MY_ZCALLOC */

zutil.h

@@ -1,5 +1,5 @@
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -8,21 +8,22 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.9 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
 
 #include "zlib.h"
 
-#if defined(MSDOS) || defined(VMS)
-#   include <stddef.h>
-#   include <errno.h>
-#else
-    extern int errno;
-#endif
 #ifdef STDC
+#  include <stddef.h>
 #  include <string.h>
+#  include <stdlib.h>
+#endif
+#ifdef NO_ERRNO_H
+    extern int errno;
+#else
+#   include <errno.h>
 #endif
 
 #ifndef local
@@ -36,17 +37,19 @@ typedef unsigned short ush;
 typedef ush FAR ushf;
 typedef unsigned long  ulg;
 
-extern char *z_errmsg[]; /* indexed by 1-zlib_error */
+extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
+/* (size given to avoid silly warnings with Visual C++) */
 
-#define ERR_RETURN(strm,err) return (strm->msg=z_errmsg[1-err], err)
+#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
+
+#define ERR_RETURN(strm,err) \
+  return (strm->msg = (char*)ERR_MSG(err), (err))
 /* To be used only when the state is known to be valid */
 
         /* common constants */
 
-#define DEFLATED   8
-
 #ifndef DEF_WBITS
-#  define DEF_WBITS 15
+#  define DEF_WBITS MAX_WBITS
 #endif
 /* default windowBits for decompression. MAX_WBITS is for compression only */
 
@@ -66,13 +69,21 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #define MAX_MATCH  258
 /* The minimum and maximum match lengths */
 
+#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
+
         /* target dependencies */
 
 #ifdef MSDOS
 #  define OS_CODE  0x00
 #  ifdef __TURBOC__
+#    if(__STDC__ == 1) && (defined(__LARGE__) || defined(__COMPACT__))
+       /* Allow compilation with ANSI keywords only enabled */
+       void _Cdecl farfree( void *block );
+       void *_Cdecl farmalloc( unsigned long nbytes );
+#    else
 #     include <alloc.h>
-#  else /* MSC */
+#    endif
+#  else /* MSC or DJGPP */
 #    include <malloc.h>
 #  endif
 #endif
@@ -81,13 +92,13 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define OS_CODE  0x06
 #endif
 
-#ifdef WIN32 /* Windows NT */
+#ifdef WIN32 /* Window 95 & Windows NT */
 #  define OS_CODE  0x0b
 #endif
 
 #if defined(VAXC) || defined(VMS)
 #  define OS_CODE  0x02
-#  define FOPEN(name, mode) \
+#  define F_OPEN(name, mode) \
      fopen((name), (mode), "mbc=60", "ctx=stm", "rfm=fix", "mrs=512")
 #endif
 
@@ -111,14 +122,23 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define OS_CODE  0x0a
 #endif
 
+#if defined(_BEOS_) || defined(RISCOS)
+#  define fdopen(fd,mode) NULL /* No fdopen() */
+#endif
+
+#if (defined(_MSC_VER) && (_MSC_VER >= 600))
+#  define fdopen(fd,type)  _fdopen(fd,type)
+#endif
+
+
         /* Common defaults */
 
 #ifndef OS_CODE
 #  define OS_CODE  0x03  /* assume Unix */
 #endif
 
-#ifndef FOPEN
+#ifndef F_OPEN
-#  define FOPEN(name, mode) fopen((name), (mode))
+#  define F_OPEN(name, mode) fopen((name), (mode))
 #endif
 
          /* functions */
@@ -130,37 +150,46 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define zstrerror(errnum) ""
 #endif
 
-#if defined(pyr) && !defined(NO_MEMCPY)
+#if defined(pyr)
+#  define NO_MEMCPY
+#endif
+#if defined(SMALL_MEDIUM) && !defined(_MSC_VER) && !defined(__SC__)
+ /* Use our own functions for small and medium model with MSC <= 5.0.
+  * You may have to use the same strategy for Borland C (untested).
+  * The __SC__ check is for Symantec.
+  */
 #  define NO_MEMCPY
 #endif
 #if defined(STDC) && !defined(HAVE_MEMCPY) && !defined(NO_MEMCPY)
 #  define HAVE_MEMCPY
 #endif
 #ifdef HAVE_MEMCPY
-#  ifdef M_I86MM /* MSC medium model */
+#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
 #    define zmemcpy _fmemcpy
+#    define zmemcmp _fmemcmp
 #    define zmemzero(dest, len) _fmemset(dest, 0, len)
 #  else
 #    define zmemcpy memcpy
+#    define zmemcmp memcmp
 #    define zmemzero(dest, len) memset(dest, 0, len)
 #  endif
 #else
-   extern void zmemcpy  OF((Byte* dest, Byte* source, uInt len));
+   extern void zmemcpy  OF((Bytef* dest, Bytef* source, uInt len));
-   extern void zmemzero OF((Byte* dest, uInt len));
+   extern int  zmemcmp  OF((Bytef* s1,   Bytef* s2, uInt len));
+   extern void zmemzero OF((Bytef* dest, uInt len));
 #endif
 
 /* Diagnostic functions */
 #ifdef DEBUG
 #  include <stdio.h>
-#  ifndef verbose
+   extern int z_verbose;
-#    define verbose 0
+   extern void z_error    OF((char *m));
-#  endif
 #  define Assert(cond,msg) {if(!(cond)) z_error(msg);}
-#  define Trace(x) fprintf x
+#  define Trace(x) {if (z_verbose>=0) fprintf x ;}
-#  define Tracev(x) {if (verbose) fprintf x ;}
+#  define Tracev(x) {if (z_verbose>0) fprintf x ;}
-#  define Tracevv(x) {if (verbose>1) fprintf x ;}
+#  define Tracevv(x) {if (z_verbose>1) fprintf x ;}
-#  define Tracec(c,x) {if (verbose && (c)) fprintf x ;}
+#  define Tracec(c,x) {if (z_verbose>0 && (c)) fprintf x ;}
-#  define Tracecv(c,x) {if (verbose>1 && (c)) fprintf x ;}
+#  define Tracecv(c,x) {if (z_verbose>1 && (c)) fprintf x ;}
 #else
 #  define Assert(cond,msg)
 #  define Trace(x)
@@ -171,16 +200,14 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #endif
 
 
-typedef uLong (*check_func) OF((uLong check, Bytef *buf, uInt len));
+typedef uLong (EXPORT *check_func) OF((uLong check, const Bytef *buf,
-
+				       uInt len));
-extern void z_error    OF((char *m));
+voidpf zcalloc OF((voidpf opaque, unsigned items, unsigned size));
-
+void   zcfree  OF((voidpf opaque, voidpf ptr));
-voidp zcalloc OF((voidp opaque, unsigned items, unsigned size));
-void  zcfree  OF((voidp opaque, voidp ptr));
 
 #define ZALLOC(strm, items, size) \
            (*((strm)->zalloc))((strm)->opaque, (items), (size))
-#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidp)(addr))
+#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidpf)(addr))
 #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
 
 #endif /* _Z_UTIL_H */