zlib 1.0.8

ChangeLog

@@ -1,6 +1,157 @@
 
 		ChangeLog file for zlib
 
+Changes in 1.0.8 (27 Jan 1998)
+- fixed offsets in contrib/asm386/gvmat32.asm (Gilles Vollant)
+- fix gzgetc and gzputc for big endian systems (Markus Oberhumer)
+- added compress2() to allow setting the compression level
+- include sys/types.h to get off_t on some systems (Marc Lehmann & QingLong)
+- use constant arrays for the static trees in trees.c instead of computing
+  them at run time (thanks to Ken Raeburn for this suggestion). To create
+  trees.h, compile with GEN_TREES_H and run "make test".
+- check return code of example in "make test" and display result
+- pass minigzip command line options to file_compress
+- simplifying code of inflateSync to avoid gcc 2.8 bug
+
+- support CC="gcc -Wall" in configure -s (QingLong)
+- avoid a flush caused by ftell in gzopen for write mode (Ken Raeburn)
+- fix test for shared library support to avoid compiler warnings
+- zlib.lib -> zlib.dll in msdos/zlib.rc (Gilles Vollant)
+- check for TARGET_OS_MAC in addition to MACOS (Brad Pettit)
+- do not use fdopen for Metrowerks on Mac (Brad Pettit))
+- add checks for gzputc and gzputc in example.c
+- avoid warnings in gzio.c and deflate.c (Andreas Kleinert)
+- use const for the CRC table (Ken Raeburn)
+- fixed "make uninstall" for shared libraries
+- use Tracev instead of Trace in infblock.c
+- in example.c use correct compressed length for test_sync
+- suppress +vnocompatwarnings in configure for HPUX (not always supported)
+
+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)
+- 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

INDEX

@@ -2,17 +2,28 @@ ChangeLog	history of changes
 INDEX			this file
 Make_vms.com		script for Vax/VMS
 Makefile		makefile for Unix (generated by configure)
-Makefile.b32	makefile for Borland C++   32-bit
-Makefile.bor	makefile for Borland C/C++ 16-bit
-Makefile.dj2	makefile for DJGPP 2.x
 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
-Makefile.tc	makefile for Turbo C
-Makefile.wat	makefile for Watcom 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
@@ -44,3 +55,20 @@ 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.

Makefile

@@ -1,10 +1,11 @@
 # Makefile for zlib
-# Copyright (C) 1995-1996 Jean-loup Gailly.
+# 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
+# If you wish to build zlib as a shared library, use: ./configure -s
 
 # To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
 #    make install
@@ -22,12 +23,14 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
 
-VER=1.0.1
+VER=1.0.8
 LIBS=libz.a
+SHAREDLIB=libz.so
 
 AR=ar rc
 RANLIB=ranlib
 TAR=tar
+SHELL=/bin/sh
 
 prefix=/usr/local
 exec_prefix = $(prefix)
@@ -37,21 +40,35 @@ OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
 
 TEST_OBJS = example.o minigzip.o
 
-DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] descrip.mms *.[ch]
+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; \
-	echo hello world | ./minigzip | ./minigzip -d 
+	echo hello world | ./minigzip | ./minigzip -d || \
+	  echo '		*** minigzip test FAILED ***' ; \
+	if ./example; then \
+	  echo '		*** zlib test OK ***'; \
+	else \
+	  echo '		*** zlib test FAILED ***'; \
+	fi
 
 libz.a: $(OBJS)
 	$(AR) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) 2>/dev/null
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
-libz.so.$(VER): $(OBJS)
+$(SHAREDLIB).$(VER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f libz.so; ln -s $@ libz.so
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
 
 example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
@@ -67,26 +84,36 @@ install: $(LIBS)
 	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 $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
-	  ln -s libz.so.$(VER) libz.so; \
+	  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); \
+	cd $(prefix)/include; \
-	if test -f libz.so; then \
+	v=$(VER); \
-	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	if test -f zlib.h; then \
-	 rm -f libz.so.$$v libz.so; \
+	  v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`; \
+          rm -f zlib.h zconf.h; \
+	fi; \
+	cd $(exec_prefix)/lib; rm -f libz.a; \
+	if test -f $(SHAREDLIB).$$v; then \
+	  rm -f $(SHAREDLIB).$$v $(SHAREDLIB) $(SHAREDLIB).1; \
 	fi
-	cd $(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`;\
+	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
-	zip -ul9 zlib-$$v $(DISTFILES)
+	zip -ul9 zlib$$v $(DISTFILES)
 	mv Makefile~ Makefile
 
 dist:
@@ -124,6 +151,6 @@ 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 
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.h
 uncompr.o: zlib.h zconf.h
 zutil.o: zutil.h zlib.h zconf.h  

Makefile.dj2

@@ -1,79 +0,0 @@
-# Makefile for zlib.  Modified for djgpp v2.0 by F. J. Donahoe, 3/15/96.
-# Copyright (C) 1995-1996 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h 
-
-# 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 for [make].
-# Alternately these variables may be defined below.
-
-CC=gcc
-
-#CFLAGS=-MMD -O
-#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS=-MMD -g -DDEBUG
-CFLAGS=-MMD -O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
-           -Wstrict-prototypes -Wmissing-prototypes
-INSTALL=install
-LDLIBS=-L. -lz
-LD=$(CC) -s -o
-LDSHARED=$(CC)
-
-VER=1.0
-LIBS=libz.a
-
-AR=ar rcs
-# The default value of RM is "rm -f."  If "rm.exe" is not found, uncomment:
-# RM=del
-
-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 Change.Log configur Makefile.in Makefile Makefile.msc \
-	    Makefile.bor Makefile.tc Make_vms.com descrip.mms zlib099.pat \
-	    *.bak *.old *.[ch]
-
-all: example.exe minigzip.exe
-
-test: all
-	./example
-	echo hello world | .\minigzip | .\minigzip -d 
-
-%.o : %.c
-	$(CC) $(CFLAGS) -c $< -o $@
-
-libz.a: $(OBJS)
-	$(AR) $@ $(OBJS)
-
-libz.so.$(VER): $(OBJS)
-	$(LDSHARED) -o $@ $(OBJS)
-	rm -f libz.so; ln -s $@ libz.so
-
-%.exe : %.o $(LIBS)
-	$(LD) $@ $< $(LDLIBS)
-
-# INCLUDE_PATH and LIBRARY_PATH were set for [make] in djgpp.env
-
-install: $(LIBS)
-	$(INSTALL) zlib.h zconf.h $(INCLUDE_PATH)
-	$(INSTALL) $(LIBS) $(LIBRARY_PATH)
-
-uninstall:
-	$(RM) $(LIBRARY_PATH)/$(LIBS)
-	$(RM) $(INCLUDE_PATH)/zlib.h $(INCLUDE_PATH)/zconf.h
-
-clean:
-	$(RM) *.d *.o *.~ *.exe libz.a libz.so* foo.gz
-
-DEPS := $(wildcard *.d)
-ifneq ($(DEPS),)
-include $(DEPS)
-endif

Makefile.in

@@ -1,10 +1,11 @@
 # Makefile for zlib
-# Copyright (C) 1995-1996 Jean-loup Gailly.
+# 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
+# If you wish to build zlib as a shared library, use: ./configure -s
 
 # To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
 #    make install
@@ -22,12 +23,14 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
 
-VER=1.0.1
+VER=1.0.8
 LIBS=libz.a
+SHAREDLIB=libz.so
 
 AR=ar rc
 RANLIB=ranlib
 TAR=tar
+SHELL=/bin/sh
 
 prefix=/usr/local
 exec_prefix = $(prefix)
@@ -37,21 +40,35 @@ OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
 
 TEST_OBJS = example.o minigzip.o
 
-DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] descrip.mms *.[ch]
+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; \
-	echo hello world | ./minigzip | ./minigzip -d 
+	echo hello world | ./minigzip | ./minigzip -d || \
+	  echo '		*** minigzip test FAILED ***' ; \
+	if ./example; then \
+	  echo '		*** zlib test OK ***'; \
+	else \
+	  echo '		*** zlib test FAILED ***'; \
+	fi
 
 libz.a: $(OBJS)
 	$(AR) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) 2>/dev/null
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
-libz.so.$(VER): $(OBJS)
+$(SHAREDLIB).$(VER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f libz.so; ln -s $@ libz.so
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
 
 example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
@@ -67,26 +84,36 @@ install: $(LIBS)
 	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 $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
-	  ln -s libz.so.$(VER) libz.so; \
+	  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); \
+	cd $(prefix)/include; \
-	if test -f libz.so; then \
+	v=$(VER); \
-	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	if test -f zlib.h; then \
-	 rm -f libz.so.$$v libz.so; \
+	  v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`; \
+          rm -f zlib.h zconf.h; \
+	fi; \
+	cd $(exec_prefix)/lib; rm -f libz.a; \
+	if test -f $(SHAREDLIB).$$v; then \
+	  rm -f $(SHAREDLIB).$$v $(SHAREDLIB) $(SHAREDLIB).1; \
 	fi
-	cd $(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`;\
+	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
-	zip -ul9 zlib-$$v $(DISTFILES)
+	zip -ul9 zlib$$v $(DISTFILES)
 	mv Makefile~ Makefile
 
 dist:
@@ -124,6 +151,6 @@ 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 
+trees.o: deflate.h zutil.h zlib.h zconf.h trees.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

README

@@ -1,14 +1,16 @@
-zlib 1.0.1 is a general purpose data compression library.  All the code
+zlib 1.0.8 is a general purpose data compression library.  All the code
-is reentrant (thread safe).  The data format used by the zlib library
+is thread safe.  The data format used by the zlib library
-is described in the files zlib-3.3.doc, deflate-1.3.doc and
+is described by RFCs (Request for Comments) 1950 to 1952 in the files 
-gzip-4.3.doc, available in various formats from
+ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
-ftp://swrinde.nde.swri.edu/pub/png/documents/zlib/
+format) and rfc1952.txt (gzip format). These documents are also available in
+other formats from ftp://ftp.uu.net/graphics/png/documents/zlib/zdoc-index.html
 
-All functions of the compression library are documented in the file
+All functions of the compression library are documented in the file zlib.h
-zlib.h. A usage example of the library is given in the file example.c
+(volunteer to write man pages welcome, contact jloup@gzip.org). A usage
-which also tests that the library is working correctly. Another
+example of the library is given in the file example.c which also tests that
-example is given in the file minigzip.c. The compression library itself
+the library is working correctly. Another example is given in the file
-is composed of all source files except example.c and minigzip.c.
+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, follow the instructions
 given at the top of Makefile. In short "make test; make install"
@@ -17,28 +19,58 @@ makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
 
 Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
 if this fails, to the addresses given below in the Copyright section.
+The zlib home page is http://www.cdrom.com/pub/infozip/zlib/
+The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/
+Mark Nelson wrote an article about zlib for the Jan. 1997 issue of 
+Dr. Dobb's Journal; a copy of the article is available in
+http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
 
-The changes made in version 1.0.1 are documented in the file ChangeLog.
+The changes made in version 1.0.8 are documented in the file ChangeLog.
-Version number 1.0 was skipped to avoid confusion with version 0.99
+The main changes since 1.0.7 are:
-which had some references to 1.0 already. The main changes since 0.99 are:
 
-- fix array overlay in deflate.c which sometimes caused bad compressed data
+- fixed offsets in contrib/asm386/gvmat32.asm (Gilles Vollant)
-- fix inflate bug with empty stored block
+- fix gzgetc and gzputc for big endian systems (Markus Oberhumer)
-- fix MSDOS medium model which was broken in 0.99
+- added compress2() to allow setting the compression level
-- fix deflateParams() which could generated bad compressed data.
+- include sys/types.h to get off_t on some systems (Marc Lehmann & QingLong)
-- added an INDEX file
+- use constant arrays for the static trees in trees.c instead of computing
-- new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
+  them at run time (thanks to Ken Raeburn for this suggestion). To create
-  Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
+  trees.h, compile with GEN_TREES_H and run "make test".
-- several portability improvements
+- check return code of example in "make test" and display result
+- pass minigzip command line options to file_compress
+
+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:
 
-- For Turbo C the small model is supported only with reduced performance to
+- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
-  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+  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
 
-- For 64-bit Iris, deflate.c must be compiled without any optimization.
+  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.
+
+- "make test" fails on Solaris 2.6 with gcc 2.8.0. It works with cc and
+   with gcc 2.7.2.1.
+
+- 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 -32 compiler flag).
+  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.
@@ -46,9 +78,13 @@ Notes for some targets:
 - 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.
 
-A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
+- For shared memory multiprocessors, the decompression code assumes that
-is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
+  writes to pointers are atomic.
-ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
+
+- gzdopen is not supported on RISCOS, BEOS and Mac
+
+- 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
 
 
 Acknowledgments:
@@ -60,7 +96,7 @@ Acknowledgments:
 
 Copyright notice:
 
- (C) 1995-1996 Jean-loup Gailly and Mark Adler
+ (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
@@ -79,7 +115,7 @@ Copyright notice:
   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) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: adler32.c,v 1.9 1996/01/30 21:59:09 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -18,7 +18,7 @@
 #define DO16(buf)   DO8(buf,0); DO8(buf,8);
 
 /* ========================================================================= */
-uLong adler32(adler, buf, len)
+uLong EXPORT adler32(adler, buf, len)
     uLong adler;
     const Bytef *buf;
     uInt len;

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

@@ -1,38 +1,39 @@
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-1996 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 1.9 1996/01/30 21:59:09 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
 /* ===========================================================================
-     Compresses the source buffer into the destination buffer.  sourceLen is
+     Compresses the source buffer into the destination buffer. The level
-   the byte length of the source buffer. Upon entry, destLen is the total
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte
-   size of the destination buffer, which must be at least 0.1% larger than
+   length of the source buffer. Upon entry, destLen is the total size of the
-   sourceLen plus 8 bytes. Upon exit, destLen is the actual size of the
+   destination buffer, which must be at least 0.1% larger than sourceLen plus
-   compressed buffer.
+   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
-     This function can be used to compress a whole file at once if the
+
-   input file is mmap'ed.
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
-     compress returns Z_OK if success, Z_MEM_ERROR if there was not
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
-   enough memory, Z_BUF_ERROR if there was not enough room in the output
+   Z_STREAM_ERROR if the level parameter is invalid.
-   buffer.
 */
-int compress (dest, destLen, source, sourceLen)
+int EXPORT compress2 (dest, destLen, source, sourceLen, level)
     Bytef *dest;
     uLongf *destLen;
     const Bytef *source;
     uLong sourceLen;
+    int level;
 {
     z_stream stream;
     int err;
 
     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;
@@ -41,7 +42,7 @@ int compress (dest, destLen, source, sourceLen)
     stream.zfree = (free_func)0;
     stream.opaque = (voidpf)0;
 
-    err = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
+    err = deflateInit(&stream, level);
     if (err != Z_OK) return err;
 
     err = deflate(&stream, Z_FINISH);
@@ -54,3 +55,14 @@ int compress (dest, destLen, source, sourceLen)
     err = deflateEnd(&stream);
     return err;
 }
+
+/* ===========================================================================
+ */
+int EXPORT compress (dest, destLen, source, sourceLen)
+    Bytef *dest;
+    uLongf *destLen;
+    const Bytef *source;
+    uLong sourceLen;
+{
+    return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
+}

configure

@@ -4,6 +4,10 @@
 # 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:
@@ -11,22 +15,41 @@
 # 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 > $test.c <<EOF
-int hello() { printf("hello\n"); }
+extern int getchar();
+int hello() {return getchar();}
 EOF
-if test -z "$CC" && (gcc -c -O3 $test.c) 2>/dev/null; then
+
-  CC=gcc
+test -z "$CC" && echo Checking for gcc...
+cc=${CC-gcc}
+cflags=${CFLAGS-"-O3"}
+case "$cc" in
+  *gcc*) gcc=1;;
+esac
+
+if test "$gcc" -eq 1 && ($cc -c $cflags $test.c) 2>/dev/null; then
+  CC="$cc"
   SFLAGS=${CFLAGS-"-fPIC -O3"}
-  CFLAGS=${CFLAGS-"-O3"}
+  CFLAGS="$cflags"
-  LDSHARED=${LDSHARED-"gcc -shared"}
+  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=${CC-cc}
@@ -50,37 +73,58 @@ else
 	     LDSHARED=${LDSHARED-"cc -dy -KPIC -G"};;
   HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
 	     CFLAGS=${CFLAGS-"-O"}
+#	     LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
 	     LDSHARED=${LDSHARED-"ld -b"}
-	     SHAREDLIBS='libz.sl';;
+	     shared_ext='.sl'
-  # send working options for other systems to gzip@prep.ai.mit.edu
+	     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.so $test.o) 2>&1`" = ""; then
+     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then
     CFLAGS="$SFLAGS"
-  LIBS='libz.so.$(VER)'
+    LIBS="$SHAREDLIB.$VER"
-  echo Building shared library libz.so.$VER with $CC.
+    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.so
+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/=.*/=$CC/
+/^CC *=/s%=.*%=$CC%
-/^CFLAGS *=/s/=.*/=$CFLAGS/
+/^CFLAGS *=/s%=.*%=$CFLAGS%
-/^LDSHARED *=/s/=.*/=$LDSHARED/
+/^LDSHARED *=/s%=.*%=$LDSHARED%
-/^LIBS *=/s,=.*,=$LIBS,
+/^LIBS *=/s%=.*%=$LIBS%
-/^AR *=/s/=.*/=$AR/
+/^SHAREDLIB *=/s%=.*%=$SHAREDLIB%
-/^RANLIB *=/s,=.*,=$RANLIB,
+/^AR *=/s%=.*%=$AR%
-/^VER *=/s/=.*/=$VER/
+/^RANLIB *=/s%=.*%=$RANLIB%
-/^prefix *=/s,=.*,=$prefix,
+/^VER *=/s%=.*%=$VER%
-/^exec_prefix *=/s,=.*,=$exec_prefix,
+/^prefix *=/s%=.*%=$prefix%
+/^exec_prefix *=/s%=.*%=$exec_prefix%
 " > Makefile

contrib/README.contrib

@@ -0,0 +1,20 @@
+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(), for Visual C++ 4.2 and ML 6.11c
+
+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 +1,465 @@
+;
+; 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
+
+    ;  all the +4 offsets are due to the addition of pending_buf_size
+    ;  in the deflate_state structure since the asm code was first written
+    dep_chain_length    equ     70h+4
+    dep_window          equ     2ch+4
+    dep_strstart        equ     60h+4
+    dep_prev_length     equ     6ch+4
+    dep_nice_match      equ     84h+4
+    dep_w_size          equ     20h+4
+    dep_prev            equ     34h+4
+    dep_w_mask          equ     28h+4
+    dep_good_match      equ     80h+4
+    dep_match_start     equ     64h+4
+    dep_lookahead       equ     68h+4
+
+
+_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

@@ -1,9 +1,9 @@
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: crc32.c,v 1.8 1996/01/30 21:59:10 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -45,7 +45,7 @@ local void make_crc_table()
   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};
+  static const 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;
@@ -65,7 +65,7 @@ local void make_crc_table()
 /* ========================================================================
  * Table of CRC-32's of all single-byte values (made by make_crc_table)
  */
-local uLongf crc_table[256] = {
+local const uLongf crc_table[256] = {
   0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
   0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
   0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
@@ -124,12 +124,12 @@ local uLongf crc_table[256] = {
 /* =========================================================================
  * This function can be used by asm versions of crc32()
  */
-uLongf *get_crc_table()
+const uLongf * EXPORT get_crc_table()
 {
 #ifdef DYNAMIC_CRC_TABLE
   if (crc_table_empty) make_crc_table();
 #endif
-  return (uLongf *)crc_table;
+  return (const uLongf *)crc_table;
 }
 
 /* ========================================================================= */
@@ -139,7 +139,7 @@ uLongf *get_crc_table()
 #define DO8(buf)  DO4(buf); DO4(buf);
 
 /* ========================================================================= */
-uLong crc32(crc, buf, len)
+uLong EXPORT crc32(crc, buf, len)
     uLong crc;
     const Bytef *buf;
     uInt len;

deflate.c

@@ -1,5 +1,5 @@
 /* deflate.c -- compress data using the deflation algorithm
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -36,8 +36,8 @@
  *
  *  REFERENCES
  *
- *      Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
+ *      Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
- *      Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
+ *      Available in ftp://ds.internic.net/rfc/rfc1951.txt
  *
  *      A description of the Rabin and Karp algorithm is given in the book
  *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
@@ -47,11 +47,12 @@
  *
  */
 
-/* $Id: deflate.c,v 1.12 1996/01/30 21:59:11 me Exp $ */
+/* @(#) $Id$ */
 
 #include "deflate.h"
 
-char deflate_copyright[] = " deflate 1.0.1 Copyright 1995-1996 Jean-loup Gailly ";
+const char deflate_copyright[] =
+   " deflate 1.0.8 Copyright 1995-1998 Jean-loup Gailly ";
 /*
   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
@@ -62,17 +63,29 @@ char deflate_copyright[] = " deflate 1.0.1 Copyright 1995-1996 Jean-loup Gailly
 /* ===========================================================================
  *  Function prototypes.
  */
+typedef enum {
+    need_more,      /* block not completed, need more input or more output */
+    block_done,     /* block flush performed */
+    finish_started, /* finish started, need only more output at next deflate */
+    finish_done     /* finish done, accept no more input or output */
+} block_state;
+
+typedef block_state (*compress_func) OF((deflate_state *s, int flush));
+/* Compression function. Returns the block state after the call. */
+
 local void fill_window    OF((deflate_state *s));
-local int  deflate_stored OF((deflate_state *s, int flush));
+local block_state deflate_stored OF((deflate_state *s, int flush));
-local int  deflate_fast   OF((deflate_state *s, int flush));
+local block_state deflate_fast   OF((deflate_state *s, int flush));
-local int  deflate_slow   OF((deflate_state *s, int flush));
+local block_state deflate_slow   OF((deflate_state *s, int flush));
 local void lm_init        OF((deflate_state *s));
-local uInt longest_match  OF((deflate_state *s, IPos cur_match));
 local void putShortMSB    OF((deflate_state *s, uInt b));
-local void flush_pending  OF((z_stream *strm));
+local void flush_pending  OF((z_streamp strm));
-local int read_buf        OF((z_stream *strm, charf *buf, unsigned size));
+local int read_buf        OF((z_streamp strm, charf *buf, unsigned size));
 #ifdef ASMV
       void match_init OF((void)); /* asm code initialization */
+      uInt longest_match  OF((deflate_state *s, IPos cur_match));
+#else
+local uInt longest_match  OF((deflate_state *s, IPos cur_match));
 #endif
 
 #ifdef DEBUG
@@ -97,9 +110,6 @@ local  void check_match OF((deflate_state *s, IPos start, IPos match,
  * See deflate.c for comments about the MIN_MATCH+1.
  */
 
-typedef int (*compress_func) OF((deflate_state *s, int flush));
-/* Compressing function */
-
 /* Values for max_lazy_match, good_match and max_chain_length, depending on
  * the desired pack level (0..9). The values given below have been tuned to
  * exclude worst case performance for pathological files. Better values may be
@@ -113,7 +123,7 @@ typedef struct config_s {
    compress_func func;
 } config;
 
-local config configuration_table[10] = {
+local const config configuration_table[10] = {
 /*      good lazy nice chain */
 /* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
 /* 1 */ {4,    4,  8,    4, deflate_fast}, /* maximum speed, no lazy matches */
@@ -168,8 +178,8 @@ struct static_tree_desc_s {int dummy;}; /* for buggy compilers */
     zmemzero((charf *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
 
 /* ========================================================================= */
-int deflateInit_(strm, level, version, stream_size)
+int EXPORT deflateInit_(strm, level, version, stream_size)
-    z_stream *strm;
+    z_streamp strm;
     int level;
     const char *version;
     int stream_size;
@@ -180,9 +190,9 @@ int deflateInit_(strm, level, version, stream_size)
 }
 
 /* ========================================================================= */
-int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
+int EXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 		  version, stream_size)
-    z_stream *strm;
+    z_streamp strm;
     int  level;
     int  method;
     int  windowBits;
@@ -193,13 +203,14 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 {
     deflate_state *s;
     int noheader = 0;
+    static const char* my_version = ZLIB_VERSION;
 
     ushf *overlay;
     /* We overlay pending_buf and d_buf+l_buf. This works since the average
      * output size for (length,distance) codes is <= 24 bits.
      */
 
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+    if (version == Z_NULL || version[0] != my_version[0] ||
         stream_size != sizeof(z_stream)) {
 	return Z_VERSION_ERROR;
     }
@@ -246,10 +257,11 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 
     overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
     s->pending_buf = (uchf *) overlay;
+    s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
 
     if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
         s->pending_buf == Z_NULL) {
-        strm->msg = ERR_MSG(Z_MEM_ERROR);
+        strm->msg = (char*)ERR_MSG(Z_MEM_ERROR);
         deflateEnd (strm);
         return Z_MEM_ERROR;
     }
@@ -264,8 +276,8 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 }
 
 /* ========================================================================= */
-int deflateSetDictionary (strm, dictionary, dictLength)
+int EXPORT deflateSetDictionary (strm, dictionary, dictLength)
-    z_stream *strm;
+    z_streamp strm;
     const Bytef *dictionary;
     uInt  dictLength;
 {
@@ -283,7 +295,9 @@ int deflateSetDictionary (strm, dictionary, dictLength)
     if (length < MIN_MATCH) return Z_OK;
     if (length > MAX_DIST(s)) {
 	length = MAX_DIST(s);
-	dictionary += dictLength - length;
+#ifndef USE_DICT_HEAD
+	dictionary += dictLength - length; /* use the tail of the dictionary */
+#endif
     }
     zmemcpy((charf *)s->window, dictionary, length);
     s->strstart = length;
@@ -303,8 +317,8 @@ int deflateSetDictionary (strm, dictionary, dictLength)
 }
 
 /* ========================================================================= */
-int deflateReset (strm)
+int EXPORT deflateReset (strm)
-    z_stream *strm;
+    z_streamp strm;
 {
     deflate_state *s;
     
@@ -333,8 +347,8 @@ int deflateReset (strm)
 }
 
 /* ========================================================================= */
-int deflateParams(strm, level, strategy)
+int EXPORT deflateParams(strm, level, strategy)
-    z_stream *strm;
+    z_streamp strm;
     int level;
     int strategy;
 {
@@ -388,7 +402,7 @@ local void putShortMSB (s, b)
  * (See also read_buf()).
  */
 local void flush_pending(strm)
-    z_stream *strm;
+    z_streamp strm;
 {
     unsigned len = strm->state->pending;
 
@@ -407,15 +421,17 @@ local void flush_pending(strm)
 }
 
 /* ========================================================================= */
-int deflate (strm, flush)
+int EXPORT deflate (strm, flush)
-    z_stream *strm;
+    z_streamp strm;
     int flush;
 {
     int old_flush; /* value of flush param for previous deflate call */
     deflate_state *s;
 
-    if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
+    if (strm == Z_NULL || strm->state == Z_NULL ||
-    
+	flush > Z_FINISH || flush < 0) {
+        return Z_STREAM_ERROR;
+    }
     s = strm->state;
 
     if (strm->next_out == Z_NULL ||
@@ -447,14 +463,23 @@ int deflate (strm, flush)
 	if (s->strstart != 0) {
 	    putShortMSB(s, (uInt)(strm->adler >> 16));
 	    putShortMSB(s, (uInt)(strm->adler & 0xffff));
-	    strm->adler = 1L;
 	}
+	strm->adler = 1L;
     }
 
     /* Flush as much pending output as possible */
     if (s->pending != 0) {
         flush_pending(strm);
-        if (strm->avail_out == 0) return Z_OK;
+        if (strm->avail_out == 0) {
+	    /* Since avail_out is 0, deflate will be called again with
+	     * more output space, but possibly with both pending and
+	     * avail_in equal to zero. There won't be anything to do,
+	     * but this is not an error situation so make sure we
+	     * return OK instead of BUF_ERROR at next call of deflate:
+             */
+	    s->last_flush = -1;
+	    return Z_OK;
+	}
 
     /* Make sure there is something to do and avoid duplicate consecutive
      * flushes. For repeated and useless calls with Z_FINISH, we keep
@@ -474,14 +499,18 @@ int deflate (strm, flush)
      */
     if (strm->avail_in != 0 || s->lookahead != 0 ||
         (flush != Z_NO_FLUSH && s->status != FINISH_STATE)) {
-        int quit;
+        block_state bstate;
 
-        if (flush == Z_FINISH) {
+	bstate = (*(configuration_table[s->level].func))(s, flush);
+
+        if (bstate == finish_started || bstate == finish_done) {
             s->status = FINISH_STATE;
         }
-	quit = (*(configuration_table[s->level].func))(s, flush);
+        if (bstate == need_more || bstate == finish_started) {
-
+	    if (strm->avail_out == 0) {
-        if (quit || strm->avail_out == 0) return Z_OK;
+	        s->last_flush = -1; /* avoid BUF_ERROR next call, see above */
+	    }
+	    return Z_OK;
 	    /* If flush != Z_NO_FLUSH && avail_out == 0, the next call
 	     * of deflate should use the same flush parameter to make sure
 	     * that the flush is complete. So we don't have to output an
@@ -489,7 +518,8 @@ int deflate (strm, flush)
 	     * ensures that for a very small output buffer, we emit at most
 	     * one empty block.
 	     */
-        if (flush != Z_NO_FLUSH && flush != Z_FINISH) {
+	}
+        if (bstate == block_done) {
             if (flush == Z_PARTIAL_FLUSH) {
                 _tr_align(s);
             } else { /* FULL_FLUSH or SYNC_FLUSH */
@@ -502,7 +532,10 @@ int deflate (strm, flush)
                 }
             }
             flush_pending(strm);
-            if (strm->avail_out == 0) return Z_OK;
+	    if (strm->avail_out == 0) {
+	      s->last_flush = -1; /* avoid BUF_ERROR at next call, see above */
+	      return Z_OK;
+	    }
         }
     }
     Assert(strm->avail_out > 0, "bug2");
@@ -522,42 +555,85 @@ int deflate (strm, flush)
 }
 
 /* ========================================================================= */
-int deflateEnd (strm)
+int EXPORT deflateEnd (strm)
-    z_stream *strm;
+    z_streamp strm;
 {
     int status;
 
     if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
 
+    status = strm->state->status;
+    if (status != INIT_STATE && status != BUSY_STATE &&
+	status != FINISH_STATE) {
+      return Z_STREAM_ERROR;
+    }
+
     /* Deallocate in reverse order of allocations: */
     TRY_FREE(strm, strm->state->pending_buf);
     TRY_FREE(strm, strm->state->head);
     TRY_FREE(strm, strm->state->prev);
     TRY_FREE(strm, strm->state->window);
 
-    status = strm->state->status;
     ZFREE(strm, strm->state);
     strm->state = Z_NULL;
 
     return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
 }
 
-/* ========================================================================= */
+/* =========================================================================
-int deflateCopy (dest, source)
+ * Copy the source state to the destination state.
-    z_stream *dest;
+ * To simplify the source, this is not supported for 16-bit MSDOS (which
-    z_stream *source;
+ * doesn't have enough memory anyway to duplicate compression states).
+ */
+int EXPORT deflateCopy (dest, source)
+    z_streamp dest;
+    z_streamp source;
 {
-    if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) {
+#ifdef MAXSEG_64K
+    return Z_STREAM_ERROR;
+#else
+    deflate_state *ds;
+    deflate_state *ss;
+    ushf *overlay;
+
+    ss = source->state;
+
+    if (source == Z_NULL || dest == Z_NULL || ss == Z_NULL) {
         return Z_STREAM_ERROR;
     }
     *dest = *source;
-    return Z_STREAM_ERROR; /* to be implemented */
-#if 0
-    dest->state = (struct internal_state FAR *)
-        (*dest->zalloc)(1, sizeof(deflate_state));
-    if (dest->state == Z_NULL) return Z_MEM_ERROR;
 
-    *(dest->state) = *(source->state);
+    ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
+    if (ds == Z_NULL) return Z_MEM_ERROR;
+    dest->state = (struct internal_state FAR *) ds;
+    *ds = *ss;
+    ds->strm = dest;
+
+    ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
+    ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
+    ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
+    overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
+    ds->pending_buf = (uchf *) overlay;
+
+    if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
+        ds->pending_buf == Z_NULL) {
+        deflateEnd (dest);
+        return Z_MEM_ERROR;
+    }
+    /* following zmemcpy do not work for 16-bit MSDOS */
+    zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
+    zmemcpy(ds->prev, ss->prev, ds->w_size * sizeof(Pos));
+    zmemcpy(ds->head, ss->head, ds->hash_size * sizeof(Pos));
+    zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
+
+    ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
+    ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
+    ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
+
+    ds->l_desc.dyn_tree = ds->dyn_ltree;
+    ds->d_desc.dyn_tree = ds->dyn_dtree;
+    ds->bl_desc.dyn_tree = ds->bl_tree;
+
     return Z_OK;
 #endif
 }
@@ -570,7 +646,7 @@ int deflateCopy (dest, source)
  * (See also flush_pending()).
  */
 local int read_buf(strm, buf, size)
-    z_stream *strm;
+    z_streamp strm;
     charf *buf;
     unsigned size;
 {
@@ -766,7 +842,7 @@ local uInt longest_match(s, cur_match)
     } while ((cur_match = prev[cur_match & wmask]) > limit
              && --chain_length != 0);
 
-    if ((uInt)best_len <= s->lookahead) return best_len;
+    if ((uInt)best_len <= s->lookahead) return (uInt)best_len;
     return s->lookahead;
 }
 #endif /* ASMV */
@@ -790,7 +866,7 @@ local void check_match(s, start, match, length)
 	} while (--length != 0);
         z_error("invalid match");
     }
-    if (verbose > 1) {
+    if (z_verbose > 1) {
         fprintf(stderr,"\\[%d,%d]", start-match, length);
         do { putc(s->window[start++], stderr); } while (--length != 0);
     }
@@ -839,11 +915,13 @@ local void fill_window(s)
                    (unsigned)wsize);
             s->match_start -= wsize;
             s->strstart    -= wsize; /* we now have strstart >= MAX_DIST */
-
             s->block_start -= (long) wsize;
 
             /* Slide the hash table (could be avoided with 32 bit values
-               at the expense of memory usage):
+               at the expense of memory usage). We slide even when level == 0
+               to keep the hash table consistent if we switch back to level > 0
+               later. (Using level 0 permanently is not an optimal usage of
+               zlib, so we don't care about this pathological case.)
              */
 	    n = s->hash_size;
 	    p = &s->head[n];
@@ -861,7 +939,6 @@ local void fill_window(s)
 		 * its value will never be used.
 		 */
 	    } while (--n);
-
             more += wsize;
         }
         if (s->strm->avail_in == 0) return;
@@ -916,21 +993,33 @@ local void fill_window(s)
 /* Same but force premature exit if necessary. */
 #define FLUSH_BLOCK(s, eof) { \
    FLUSH_BLOCK_ONLY(s, eof); \
-   if (s->strm->avail_out == 0) return 1; \
+   if (s->strm->avail_out == 0) return (eof) ? finish_started : need_more; \
 }
 
 /* ===========================================================================
  * Copy without compression as much as possible from the input stream, return
- * true if processing was terminated prematurely (no more input or output
+ * the current block state.
- * space).  This function does not insert new strings in the dictionary
+ * This function does not insert new strings in the dictionary since
- * since uncompressible data is probably not useful. This function is used
+ * uncompressible data is probably not useful. This function is used
  * only for the level=0 compression option.
- * NOTE: this function should be optimized to avoid extra copying.
+ * NOTE: this function should be optimized to avoid extra copying from
+ * window to pending_buf.
  */
-local int deflate_stored(s, flush)
+local block_state deflate_stored(s, flush)
     deflate_state *s;
     int flush;
 {
+    /* Stored blocks are limited to 0xffff bytes, pending_buf is limited
+     * to pending_buf_size, and each stored block has a 5 byte header:
+     */
+    ulg max_block_size = 0xffff;
+    ulg max_start;
+
+    if (max_block_size > s->pending_buf_size - 5) {
+        max_block_size = s->pending_buf_size - 5;
+    }
+
+    /* Copy as much as possible from input to output: */
     for (;;) {
         /* Fill the window as much as possible: */
         if (s->lookahead <= 1) {
@@ -939,7 +1028,7 @@ local int deflate_stored(s, flush)
 		   s->block_start >= (long)s->w_size, "slide too late");
 
             fill_window(s);
-            if (s->lookahead == 0 && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead == 0 && flush == Z_NO_FLUSH) return need_more;
 
             if (s->lookahead == 0) break; /* flush the current block */
         }
@@ -948,30 +1037,33 @@ local int deflate_stored(s, flush)
 	s->strstart += s->lookahead;
 	s->lookahead = 0;
 
-        /* Stored blocks are limited to 0xffff bytes: */
+	/* Emit a stored block if pending_buf will be full: */
-        if (s->strstart == 0 || s->strstart > 0xfffe) {
+ 	max_start = s->block_start + max_block_size;
+        if (s->strstart == 0 || (ulg)s->strstart >= max_start) {
 	    /* strstart == 0 is possible when wraparound on 16-bit machine */
-	    s->lookahead = s->strstart - 0xffff;
+	    s->lookahead = (uInt)(s->strstart - max_start);
-	    s->strstart = 0xffff;
+	    s->strstart = (uInt)max_start;
+            FLUSH_BLOCK(s, 0);
 	}
-
+	/* Flush if we may have to slide, otherwise block_start may become
-	/* Emit a stored block if it is large enough: */
+         * negative and the data will be gone:
+         */
         if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) {
             FLUSH_BLOCK(s, 0);
 	}
     }
     FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0; /* normal exit */
+    return flush == Z_FINISH ? finish_done : block_done;
 }
 
 /* ===========================================================================
- * Compress as much as possible from the input stream, return true if
+ * Compress as much as possible from the input stream, return the current
- * processing was terminated prematurely (no more input or output space).
+ * block state.
  * This function does not perform lazy evaluation of matches and inserts
  * new strings in the dictionary only for unmatched strings or for short
  * matches. It is used only for the fast compression options.
  */
-local int deflate_fast(s, flush)
+local block_state deflate_fast(s, flush)
     deflate_state *s;
     int flush;
 {
@@ -986,8 +1078,9 @@ local int deflate_fast(s, flush)
          */
         if (s->lookahead < MIN_LOOKAHEAD) {
             fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
-
+	        return need_more;
+	    }
             if (s->lookahead == 0) break; /* flush the current block */
         }
 
@@ -1055,7 +1148,7 @@ local int deflate_fast(s, flush)
         if (bflush) FLUSH_BLOCK(s, 0);
     }
     FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0; /* normal exit */
+    return flush == Z_FINISH ? finish_done : block_done;
 }
 
 /* ===========================================================================
@@ -1063,7 +1156,7 @@ local int deflate_fast(s, flush)
  * evaluation for matches: a match is finally adopted only if there is
  * no better match at the next window position.
  */
-local int deflate_slow(s, flush)
+local block_state deflate_slow(s, flush)
     deflate_state *s;
     int flush;
 {
@@ -1079,8 +1172,9 @@ local int deflate_slow(s, flush)
          */
         if (s->lookahead < MIN_LOOKAHEAD) {
             fill_window(s);
-            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) return 1;
+            if (s->lookahead < MIN_LOOKAHEAD && flush == Z_NO_FLUSH) {
-
+	        return need_more;
+	    }
             if (s->lookahead == 0) break; /* flush the current block */
         }
 
@@ -1158,7 +1252,7 @@ local int deflate_slow(s, flush)
             }
             s->strstart++;
             s->lookahead--;
-            if (s->strm->avail_out == 0) return 1;
+            if (s->strm->avail_out == 0) return need_more;
         } else {
             /* There is no previous match to compare with, wait for
              * the next step to decide.
@@ -1175,6 +1269,5 @@ local int deflate_slow(s, flush)
         s->match_available = 0;
     }
     FLUSH_BLOCK(s, flush == Z_FINISH);
-    return 0;
+    return flush == Z_FINISH ? finish_done : block_done;
 }
-

deflate.h

@@ -1,5 +1,5 @@
 /* deflate.h -- internal compression state
- * Copyright (C) 1995-1996 Jean-loup Gailly
+ * Copyright (C) 1995-1998 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: deflate.h,v 1.9 1996/01/30 21:59:13 me Exp $ */
+/* @(#) $Id$ */
 
 #ifndef _DEFLATE_H
 #define _DEFLATE_H
@@ -80,9 +80,10 @@ 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 */
     int   noheader;      /* suppress zlib header and adler32 */

example.c

@@ -1,9 +1,9 @@
 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-1996 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 1.13 1996/01/30 21:59:13 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -41,7 +41,7 @@ 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_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));
@@ -69,6 +69,7 @@ void test_compress(compr, comprLen, uncompr, uncomprLen)
 
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad uncompress\n");
+	exit(1);
     } else {
         printf("uncompress(): %s\n", uncompr);
     }
@@ -86,16 +87,19 @@ void test_gzio(out, in, uncompr, uncomprLen)
     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);
     }
-
+    gzputc(file, 'h');
-    if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) {
+    if (gzprintf(file, "%s, %s!", "ello", "hello") != len-2) {
-        fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
+        fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
+	exit(1);
     }
+    gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
     gzclose(file);
 
     file = gzopen(in, "rb");
@@ -107,14 +111,40 @@ void test_gzio(out, in, uncompr, uncomprLen)
     uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
     if (uncomprLen != len) {
         fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
+	exit(1);
     }
-    gzclose(file);
-
     if (strcmp((char*)uncompr, hello)) {
-        fprintf(stderr, "bad gzread\n");
+        fprintf(stderr, "bad gzread: %s\n", (char*)uncompr);
+	exit(1);
     } else {
         printf("gzread(): %s\n", uncompr);
     }
+
+    pos = gzseek(file, -8L, SEEK_CUR);
+    if (pos != 6 || gztell(file) != pos) {
+	fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
+		pos, gztell(file));
+	exit(1);
+    }
+
+    if (gzgetc(file) != ' ') {
+	fprintf(stderr, "gzgetc error\n");
+	exit(1);
+    }
+
+    uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
+    if (uncomprLen != 7) {
+        fprintf(stderr, "gzread err after gzseek: %s\n", gzerror(file, &err));
+	exit(1);
+    }
+    if (strcmp((char*)uncompr, hello+7)) {
+        fprintf(stderr, "bad gzread after gzseek\n");
+	exit(1);
+    } else {
+        printf("gzread() after gzseek: %s\n", uncompr);
+    }
+
+    gzclose(file);
 }
 
 /* ===========================================================================
@@ -171,12 +201,13 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen)
     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;
-    d_stream.next_out = uncompr;
-
     while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
         d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
         err = inflate(&d_stream, Z_NO_FLUSH);
@@ -189,6 +220,7 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen)
 
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate\n");
+	exit(1);
     } else {
         printf("inflate(): %s\n", uncompr);
     }
@@ -223,6 +255,7 @@ void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
     CHECK_ERR(err, "deflate");
     if (c_stream.avail_in != 0) {
         fprintf(stderr, "deflate not greedy\n");
+	exit(1);
     }
 
     /* Feed in already compressed data and switch to no compression: */
@@ -242,6 +275,7 @@ void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         fprintf(stderr, "deflate should report Z_STREAM_END\n");
+	exit(1);
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
@@ -263,12 +297,12 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
-    err = inflateInit(&d_stream);
-    CHECK_ERR(err, "inflateInit");
-
     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;
@@ -282,6 +316,7 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
 
     if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
         fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
+	exit(1);
     } else {
         printf("large_inflate(): OK\n");
     }
@@ -292,7 +327,7 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
  */
 void test_flush(compr, comprLen)
     Byte *compr;
-    uLong comprLen;
+    uLong *comprLen;
 {
     z_stream c_stream; /* compression stream */
     int err;
@@ -308,7 +343,7 @@ void test_flush(compr, comprLen)
     c_stream.next_in  = (Bytef*)hello;
     c_stream.next_out = compr;
     c_stream.avail_in = 3;
-    c_stream.avail_out = (uInt)comprLen;
+    c_stream.avail_out = (uInt)*comprLen;
     err = deflate(&c_stream, Z_FULL_FLUSH);
     CHECK_ERR(err, "deflate");
 
@@ -321,6 +356,8 @@ void test_flush(compr, comprLen)
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
+
+    *comprLen = c_stream.total_out;
 }
 
 /* ===========================================================================
@@ -339,12 +376,13 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
     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;
 
     inflate(&d_stream, Z_NO_FLUSH);
@@ -358,6 +396,7 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
     if (err != Z_DATA_ERROR) {
         fprintf(stderr, "inflate should report DATA_ERROR\n");
         /* Because of incorrect adler32 */
+	exit(1);
     }
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
@@ -396,6 +435,7 @@ void test_dict_deflate(compr, comprLen)
     err = deflate(&c_stream, Z_FINISH);
     if (err != Z_STREAM_END) {
         fprintf(stderr, "deflate should report Z_STREAM_END\n");
+	exit(1);
     }
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
@@ -417,12 +457,12 @@ void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
-    err = inflateInit(&d_stream);
-    CHECK_ERR(err, "inflateInit");
-
     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;
 
@@ -445,6 +485,7 @@ void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
 
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad inflate with dict\n");
+	exit(1);
     } else {
         printf("inflate with dictionary: %s\n", uncompr);
     }
@@ -461,22 +502,25 @@ int main(argc, argv)
     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 (strcmp(zlib_version, ZLIB_VERSION) != 0) {
+    } else if (strcmp(zlibVersion(), ZLIB_VERSION) != 0) {
         fprintf(stderr, "warning: different zlib version\n");
     }
 
-    compr    = (Byte*)malloc((uInt)comprLen);
+    compr    = (Byte*)calloc((uInt)comprLen, 1);
-    uncompr  = (Byte*)calloc((uInt)uncomprLen, 1); /* must be cleared */
+    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"),
@@ -489,8 +533,9 @@ int main(argc, argv)
     test_large_deflate(compr, comprLen, uncompr, uncomprLen);
     test_large_inflate(compr, comprLen, uncompr, uncomprLen);
 
-    test_flush(compr, comprLen);
+    test_flush(compr, &comprLen);
     test_sync(compr, comprLen, uncompr, uncomprLen);
+    comprLen = uncomprLen;
 
     test_dict_deflate(compr, comprLen);
     test_dict_inflate(compr, comprLen, uncompr, uncomprLen);

gzio.c

@@ -1,9 +1,11 @@
 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995-1996 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 1.12 1996/01/30 21:59:14 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 
@@ -38,10 +40,12 @@ 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));
@@ -64,6 +68,7 @@ local gzFile gz_open (path, mode, fd)
 {
     int err;
     int level = Z_DEFAULT_COMPRESSION; /* compression level */
+    int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
     char *p = (char*)mode;
     gz_stream *s;
     char fmode[80]; /* copy of mode, without the compression level */
@@ -99,6 +104,10 @@ local gzFile gz_open (path, mode, fd)
         if (*p == 'w' || *p == 'a') s->mode = 'w';
         if (*p >= '0' && *p <= '9') {
 	    level = *p - '0';
+	} else if (*p == 'f') {
+	  strategy = Z_FILTERED;
+	} else if (*p == 'h') {
+	  strategy = Z_HUFFMAN_ONLY;
 	} else {
 	    *m++ = *p; /* copy the mode */
 	}
@@ -106,19 +115,24 @@ local gzFile gz_open (path, mode, fd)
     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,
-                           Z_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;
         }
@@ -126,7 +140,7 @@ local gzFile gz_open (path, mode, fd)
     s->stream.avail_out = Z_BUFSIZE;
 
     errno = 0;
-    s->file = fd < 0 ? FOPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
+    s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
 
     if (s->file == NULL) {
         return destroy(s), (gzFile)Z_NULL;
@@ -136,16 +150,24 @@ local gzFile gz_open (path, mode, fd)
          */
         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+	s->startpos = 10L;
+	/* We use 10L instead of ftell(s->file) to because ftell causes an
+         * fflush on some systems. This version of the library doesn't use
+         * startpos anyway in write mode, so this initialization is not
+         * necessary.
+         */
     } else {
 	check_header(s); /* skip the .gz header */
+	s->startpos = (ftell(s->file) - s->stream.avail_in);
     }
+    
     return (gzFile)s;
 }
 
 /* ===========================================================================
      Opens a gzip (.gz) file for reading or writing.
 */
-gzFile gzopen (path, mode)
+gzFile EXPORT gzopen (path, mode)
     const char *path;
     const char *mode;
 {
@@ -156,7 +178,7 @@ gzFile gzopen (path, mode)
      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;
     const char *mode;
 {
@@ -168,6 +190,31 @@ gzFile gzdopen (fd, mode)
     return gz_open (name, mode, fd);
 }
 
+/* ===========================================================================
+ * Update the compression level and strategy
+ */
+int EXPORT gzsetparams (file, level, strategy)
+    gzFile file;
+    int level;
+    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.
@@ -212,8 +259,11 @@ local void check_header(s)
     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;
-	    if (c != EOF) s->stream.avail_in++, s->stream.next_in--;
+	    }
 	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
 	    return;
 	}
@@ -261,12 +311,19 @@ local int destroy (s)
 
     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;
@@ -282,13 +339,13 @@ local int destroy (s)
      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 gzread (file, buf, len)
+int EXPORT gzread (file, buf, len)
     gzFile file;
     voidp buf;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;
-    Bytef *start = buf; /* starting point for crc computation */
+    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;
@@ -296,7 +353,8 @@ int gzread (file, buf, len)
     if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
     if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
 
-    s->stream.next_out = next_out = buf;
+    next_out = (Byte*)buf;
+    s->stream.next_out = (Bytef*)buf;
     s->stream.avail_out = len;
 
     while (s->stream.avail_out != 0) {
@@ -345,7 +403,12 @@ int gzread (file, buf, len)
 		/* 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);
 		}
 	    }
@@ -357,11 +420,26 @@ int gzread (file, buf, len)
     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;
+{
+    unsigned char 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;
     const voidp buf;
     unsigned len;
@@ -370,7 +448,7 @@ int gzwrite (file, buf, len)
 
     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) {
@@ -387,18 +465,81 @@ 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;
+{
+    unsigned char cc = (unsigned char) c; /* required for big endian systems */
+
+    return gzwrite(file, &cc, 1) == 1 ? (int)cc : -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;
 {
@@ -424,6 +565,9 @@ 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: 
          */
@@ -431,9 +575,154 @@ 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 (z_off_t)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 (z_off_t)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
@@ -470,7 +759,7 @@ local uLong getLong (s)
      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;
 {
     int err;
@@ -479,14 +768,17 @@ int gzclose (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
     }
-    return destroy(file);
+    return destroy((gz_stream*)file);
 }
 
 /* ===========================================================================
@@ -496,7 +788,7 @@ 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;
 {
@@ -505,19 +797,19 @@ char*  gzerror (file, errnum)
 
     if (s == NULL) {
         *errnum = Z_STREAM_ERROR;
-        return ERR_MSG(Z_STREAM_ERROR);
+        return (const char*)ERR_MSG(Z_STREAM_ERROR);
     }
     *errnum = s->z_err;
-    if (*errnum == Z_OK) return (char*)"";
+    if (*errnum == Z_OK) return (const char*)"";
 
     m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
 
-    if (m == NULL || *m == '\0') m = ERR_MSG(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) 1995-1996 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)
-    z->adler = 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"));
+  Tracev((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;
 {
@@ -104,8 +104,8 @@ uInt w;
   s->end = s->window + w;
   s->checkfn = c;
   s->mode = TYPE;
-  Trace((stderr, "inflate:   blocks allocated\n"));
+  Tracev((stderr, "inflate:   blocks allocated\n"));
-  inflate_blocks_reset(s, z, &s->check);
+  inflate_blocks_reset(s, z, Z_NULL);
   return s;
 }
 
@@ -115,7 +115,7 @@ uInt w;
 #endif
 int inflate_blocks(s, z, r)
 inflate_blocks_statef *s;
-z_stream *z;
+z_streamp z;
 int r;
 {
   uInt t;               /* temporary storage */
@@ -139,7 +139,7 @@ int r;
       switch (t >> 1)
       {
         case 0:                         /* stored */
-          Trace((stderr, "inflate:     stored block%s\n",
+          Tracev((stderr, "inflate:     stored block%s\n",
                  s->last ? " (last)" : ""));
           DUMPBITS(3)
           t = k & 7;                    /* go to byte boundary */
@@ -147,7 +147,7 @@ int r;
           s->mode = LENS;               /* get length of stored block */
           break;
         case 1:                         /* fixed */
-          Trace((stderr, "inflate:     fixed codes block%s\n",
+          Tracev((stderr, "inflate:     fixed codes block%s\n",
                  s->last ? " (last)" : ""));
           {
             uInt bl, bd;
@@ -167,7 +167,7 @@ int r;
           s->mode = CODES;
           break;
         case 2:                         /* dynamic */
-          Trace((stderr, "inflate:     dynamic codes block%s\n",
+          Tracev((stderr, "inflate:     dynamic codes block%s\n",
                  s->last ? " (last)" : ""));
           DUMPBITS(3)
           s->mode = TABLE;
@@ -224,8 +224,6 @@ int r;
       }
 #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;
@@ -249,6 +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;
@@ -287,6 +286,8 @@ 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 = (char*)"invalid bit length repeat";
             r = Z_DATA_ERROR;
@@ -314,6 +315,7 @@ int r;
 #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)
@@ -330,7 +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;
@@ -379,15 +380,14 @@ 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"));
+  Tracev((stderr, "inflate:   blocks freed\n"));
   return Z_OK;
 }
 
@@ -400,3 +400,14 @@ 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) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -12,26 +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) 1995-1996 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;
@@ -60,7 +62,7 @@ inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
 uInt bl, bd;
 inflate_huft *tl;
 inflate_huft *td; /* need separate declaration for Borland C++ */
-z_stream *z;
+z_streamp z;
 {
   inflate_codes_statef *c;
 
@@ -80,7 +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 */
@@ -235,12 +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) 1995-1996 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) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -32,7 +32,7 @@ uInt bl, bd;
 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 */

inffast.h

@@ -1,5 +1,5 @@
 /* inffast.h -- header to use inffast.c
- * Copyright (C) 1995-1996 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) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,11 +8,7 @@
 
 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 */
@@ -27,7 +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 {
@@ -48,40 +50,36 @@ 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, version, stream_size)
+int EXPORT inflateInit2_(z, w, version, stream_size)
-z_stream *z;
+z_streamp z;
 int w;
 const char *version;
 int stream_size;
@@ -129,7 +127,7 @@ int stream_size;
     inflateEnd(z);
     return Z_MEM_ERROR;
   }
-  Trace((stderr, "inflate: allocated\n"));
+  Tracev((stderr, "inflate: allocated\n"));
 
   /* reset state */
   inflateReset(z);
@@ -137,8 +135,8 @@ int stream_size;
 }
 
 
-int inflateInit_(z, version, stream_size)
+int EXPORT inflateInit_(z, version, stream_size)
-z_stream *z;
+z_streamp z;
 const char *version;
 int stream_size;
 {
@@ -146,11 +144,11 @@ int 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;
@@ -188,7 +186,7 @@ int f;
         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;
@@ -227,7 +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)
@@ -236,6 +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;
@@ -259,7 +258,7 @@ int f;
         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;
@@ -268,11 +267,14 @@ int f;
     default:
       return Z_STREAM_ERROR;
   }
+#ifdef NEED_DUMMY_RETURN
+  return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
+#endif
 }
 
 
-int inflateSetDictionary(z, dictionary, dictLength)
+int EXPORT inflateSetDictionary(z, dictionary, dictLength)
-z_stream *z;
+z_streamp z;
 const Bytef *dictionary;
 uInt  dictLength;
 {
@@ -280,6 +282,7 @@ uInt  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;
 
@@ -294,8 +297,8 @@ uInt  dictLength;
 }
 
 
-int inflateSync(z)
+int EXPORT inflateSync(z)
-z_stream *z;
+z_streamp z;
 {
   uInt n;       /* number of bytes to look at */
   Bytef *p;     /* pointer to bytes */
@@ -318,7 +321,8 @@ z_stream *z;
   /* search */
   while (n && m < 4)
   {
-    if (*p == (Byte)(m < 2 ? 0 : 0xff))
+    static const Byte mark[4] = {0, 0, 0xff, 0xff};
+    if (*p == mark[m])
       m++;
     else if (*p)
       m = 0;
@@ -342,3 +346,19 @@ 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

@@ -1,12 +1,13 @@
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995-1996 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"
 
-char inflate_copyright[] = " inflate 1.0.1 Copyright 1995-1996 Mark Adler ";
+const char inflate_copyright[] =
+   " inflate 1.0.8 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
@@ -26,11 +27,11 @@ 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 voidpf falloc OF((
     voidpf,             /* opaque pointer (not used) */
@@ -38,18 +39,18 @@ local voidpf falloc OF((
     uInt));             /* size of item */
 
 /* Tables for deflate from PKZIP's appnote.txt. */
-local uInt cplens[31] = { /* 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[31] = { /* 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[30] = { /* 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[30] = { /* 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};
@@ -99,16 +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 */
@@ -190,6 +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 */
@@ -302,14 +304,14 @@ 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 = (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 = (char*)"incomplete dynamic bit lengths tree";
@@ -327,16 +329,17 @@ 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 = (char*)"oversubscribed literal/length tree";
-    else if (r == Z_BUF_ERROR)
+    else if (r != Z_MEM_ERROR)
     {
       inflate_trees_free(*tl, z);
       z->msg = (char*)"incomplete literal/length tree";
@@ -346,17 +349,23 @@ z_stream *z;            /* for zfree function */
   }
 
   /* 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 = (char*)"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 = (char*)"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);
@@ -442,7 +451,7 @@ 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. */

inftrees.h

@@ -1,5 +1,5 @@
 /* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-1996 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) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -22,11 +22,12 @@ uInt inflate_mask[17] = {
 /* 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;

infutil.h

@@ -1,5 +1,5 @@
 /* infutil.h -- types and macros common to blocks and codes
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -91,7 +91,7 @@ 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 */

minigzip.c

@@ -1,5 +1,5 @@
 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -13,7 +13,7 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.8 1996/01/30 21:59:23 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -37,28 +37,36 @@
 #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((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));
+void file_compress   OF((char  *file, char *mode));
 void file_uncompress OF((char  *file));
 int  main            OF((int argc, char *argv[]));
 
@@ -127,8 +135,9 @@ void gz_uncompress(in, out)
  * Compress the given file: create a corresponding .gz file and remove the
  * original.
  */
-void file_compress(file)
+void file_compress(file, mode)
     char  *file;
+    char  *mode;
 {
     local char outfile[MAX_NAME_LEN];
     FILE  *in;
@@ -142,7 +151,7 @@ void file_compress(file)
         perror(file);
         exit(1);
     }
-    out = gzopen(outfile, "wb"); /* use "wb9" for maximal compression */
+    out = gzopen(outfile, mode);
     if (out == NULL) {
         fprintf(stderr, "%s: can't gzopen %s\n", prog, outfile);
         exit(1);
@@ -194,7 +203,11 @@ 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)
@@ -203,16 +216,27 @@ 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);
@@ -221,7 +245,7 @@ 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);
         }
@@ -230,7 +254,7 @@ int main(argc, argv)
             if (uncompr) {
                 file_uncompress(*argv);
             } else {
-                file_compress(*argv);
+                file_compress(*argv, outmode);
             }
         } while (argv++, --argc);
     }

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

@@ -15,7 +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
@@ -28,6 +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
 
@@ -80,7 +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/zlib.def

@@ -0,0 +1,57 @@
+LIBRARY		"zlib"
+
+DESCRIPTION	'"""zlib data compression library"""'
+
+EXETYPE		NT
+
+SUBSYSTEM	WINDOWS
+
+STUB		'WINSTUB.EXE'
+
+VERSION		1.08
+
+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	 1,0,8,0
+  PRODUCTVERSION 1,0,8,0
+  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",	"1.0.8\0"
+      VALUE "InternalName",	"zlib\0"
+      VALUE "OriginalFilename",	"zlib.dll\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

test.c

@@ -0,0 +1,2 @@
+extern int getchar();
+int hello() {return getchar();}

trees.c

@@ -1,5 +1,5 @@
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995-1996 Jean-loup Gailly
+ * Copyright (C) 1995-1998 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -29,7 +29,9 @@
  *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
  */
 
-/* $Id: trees.c,v 1.5 1995/05/03 17:27:12 jloup Exp $ */
+/* @(#) $Id$ */
+
+/* #define GEN_TREES_H */
 
 #include "deflate.h"
 
@@ -56,16 +58,16 @@
 #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.
@@ -80,6 +82,11 @@ local uch bl_order[BL_CODES]
  * Local data. These are initialized only once.
  */
 
+#define DIST_CODE_LEN  512 /* see definition of array dist_code below */
+
+#if defined(GEN_TREES_H) || !defined(STDC)
+/* non ANSI compilers may not accept trees.h */
+
 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
@@ -92,8 +99,8 @@ local ct_data static_dtree[D_CODES];
  * 5 bits.)
  */
 
-local uch dist_code[512];
+local uch dist_code[DIST_CODE_LEN];
-/* distance codes. The first 256 values correspond to the distances
+/* Distance codes. The first 256 values correspond to the distances
  * 3 .. 258, the last 256 values correspond to the top 8 bits of
  * the 15 bit distances.
  */
@@ -107,9 +114,13 @@ local int base_length[LENGTH_CODES];
 local int base_dist[D_CODES];
 /* First normalized distance for each code (0 = distance of 1) */
 
+#else
+#  include "trees.h"
+#endif /* GEN_TREES_H */
+
 struct static_tree_desc_s {
-    ct_data *static_tree;        /* static tree or NULL */
+    const 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 */
@@ -122,7 +133,7 @@ local static_tree_desc  static_d_desc =
 {static_dtree, extra_dbits, 0,          D_CODES, MAX_BITS};
 
 local static_tree_desc  static_bl_desc =
-{(ct_data *)0, extra_blbits, 0,      BL_CODES, MAX_BL_BITS};
+{(const ct_data *)0, extra_blbits, 0,   BL_CODES, MAX_BL_BITS};
 
 /* ===========================================================================
  * Local (static) routines in this file.
@@ -148,13 +159,17 @@ local void bi_flush       OF((deflate_state *s));
 local void copy_block     OF((deflate_state *s, charf *buf, unsigned len,
                               int header));
 
+#ifdef GEN_TREES_H
+local void gen_trees_header OF((void));
+#endif
+
 #ifndef DEBUG
 #  define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
    /* Send a code of the given tree. c and tree must not have side effects */
 
 #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
 
@@ -226,12 +241,11 @@ local void send_bits(s, value, length)
 /* the arguments must not have side effects */
 
 /* ===========================================================================
- * Initialize the various 'constant' tables. In a multi-threaded environment,
+ * Initialize the various 'constant' tables.
- * this function may be called by two threads concurrently, but this is
- * harmless since both invocations do exactly the same thing.
  */
 local void tr_static_init()
 {
+#if defined(GEN_TREES_H) || !defined(STDC)
     static int static_init_done = 0;
     int n;        /* iterates over tree elements */
     int bits;     /* bit counter */
@@ -295,8 +309,74 @@ local void tr_static_init()
         static_dtree[n].Code = bi_reverse((unsigned)n, 5);
     }
     static_init_done = 1;
+
+#  ifdef GEN_TREES_H
+    gen_trees_header();
+#  endif
+#endif /* defined(GEN_TREES_H) || !defined(STDC) */
 }
 
+/* ===========================================================================
+ * Genererate the file trees.h describing the static trees.
+ */
+#ifdef GEN_TREES_H
+#  ifndef DEBUG
+#    include <stdio.h>
+#  endif
+
+#  define SEPARATOR(i, last, width) \
+      ((i) == (last)? "\n};\n\n" :    \
+       ((i) % (width) == (width)-1 ? ",\n" : ", "))
+
+void gen_trees_header()
+{
+    FILE *header = fopen("trees.h", "w");
+    int i;
+
+    Assert (header != NULL, "Can't open trees.h");
+    fprintf(header,
+	    "/* header created automatically with -DGEN_TREES_H */\n\n");
+
+    fprintf(header, "local const ct_data static_ltree[L_CODES+2] = {\n");
+    for (i = 0; i < L_CODES+2; i++) {
+	fprintf(header, "{{%3u},{%3u}}%s", static_ltree[i].Code,
+		static_ltree[i].Len, SEPARATOR(i, L_CODES+1, 5));
+    }
+
+    fprintf(header, "local const ct_data static_dtree[D_CODES] = {\n");
+    for (i = 0; i < D_CODES; i++) {
+	fprintf(header, "{{%2u},{%2u}}%s", static_dtree[i].Code,
+		static_dtree[i].Len, SEPARATOR(i, D_CODES-1, 5));
+    }
+
+    fprintf(header, "local const uch dist_code[DIST_CODE_LEN] = {\n");
+    for (i = 0; i < DIST_CODE_LEN; i++) {
+	fprintf(header, "%2u%s", dist_code[i],
+		SEPARATOR(i, DIST_CODE_LEN-1, 20));
+    }
+
+    fprintf(header, "local const uch length_code[MAX_MATCH-MIN_MATCH+1]= {\n");
+    for (i = 0; i < MAX_MATCH-MIN_MATCH+1; i++) {
+	fprintf(header, "%2u%s", length_code[i],
+		SEPARATOR(i, MAX_MATCH-MIN_MATCH, 20));
+    }
+
+    fprintf(header, "local const int base_length[LENGTH_CODES] = {\n");
+    for (i = 0; i < LENGTH_CODES; i++) {
+	fprintf(header, "%1u%s", base_length[i],
+		SEPARATOR(i, LENGTH_CODES-1, 20));
+    }
+
+    fprintf(header, "local const int base_dist[D_CODES] = {\n");
+    for (i = 0; i < D_CODES; i++) {
+	fprintf(header, "%5u%s", base_dist[i],
+		SEPARATOR(i, D_CODES-1, 10));
+    }
+
+    fclose(header);
+}
+#endif /* GEN_TREES_H */
+
 /* ===========================================================================
  * Initialize the tree data structures for a new zlib stream.
  */
@@ -415,8 +495,8 @@ 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;
+    const 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 */
@@ -543,7 +623,7 @@ local void build_tree(s, desc)
     tree_desc *desc; /* the tree descriptor */
 {
     ct_data *tree         = desc->dyn_tree;
-    ct_data *stree  = desc->stat_desc->static_tree;
+    const ct_data *stree  = desc->stat_desc->static_tree;
     int elems             = desc->stat_desc->elems;
     int n, m;          /* iterate over heap elements */
     int max_code = -1; /* largest code with non zero frequency */

trees.h

@@ -0,0 +1,128 @@
+/* header created automatically with -DGEN_TREES_H */
+
+local const ct_data static_ltree[L_CODES+2] = {
+{{ 12},{  8}}, {{140},{  8}}, {{ 76},{  8}}, {{204},{  8}}, {{ 44},{  8}},
+{{172},{  8}}, {{108},{  8}}, {{236},{  8}}, {{ 28},{  8}}, {{156},{  8}},
+{{ 92},{  8}}, {{220},{  8}}, {{ 60},{  8}}, {{188},{  8}}, {{124},{  8}},
+{{252},{  8}}, {{  2},{  8}}, {{130},{  8}}, {{ 66},{  8}}, {{194},{  8}},
+{{ 34},{  8}}, {{162},{  8}}, {{ 98},{  8}}, {{226},{  8}}, {{ 18},{  8}},
+{{146},{  8}}, {{ 82},{  8}}, {{210},{  8}}, {{ 50},{  8}}, {{178},{  8}},
+{{114},{  8}}, {{242},{  8}}, {{ 10},{  8}}, {{138},{  8}}, {{ 74},{  8}},
+{{202},{  8}}, {{ 42},{  8}}, {{170},{  8}}, {{106},{  8}}, {{234},{  8}},
+{{ 26},{  8}}, {{154},{  8}}, {{ 90},{  8}}, {{218},{  8}}, {{ 58},{  8}},
+{{186},{  8}}, {{122},{  8}}, {{250},{  8}}, {{  6},{  8}}, {{134},{  8}},
+{{ 70},{  8}}, {{198},{  8}}, {{ 38},{  8}}, {{166},{  8}}, {{102},{  8}},
+{{230},{  8}}, {{ 22},{  8}}, {{150},{  8}}, {{ 86},{  8}}, {{214},{  8}},
+{{ 54},{  8}}, {{182},{  8}}, {{118},{  8}}, {{246},{  8}}, {{ 14},{  8}},
+{{142},{  8}}, {{ 78},{  8}}, {{206},{  8}}, {{ 46},{  8}}, {{174},{  8}},
+{{110},{  8}}, {{238},{  8}}, {{ 30},{  8}}, {{158},{  8}}, {{ 94},{  8}},
+{{222},{  8}}, {{ 62},{  8}}, {{190},{  8}}, {{126},{  8}}, {{254},{  8}},
+{{  1},{  8}}, {{129},{  8}}, {{ 65},{  8}}, {{193},{  8}}, {{ 33},{  8}},
+{{161},{  8}}, {{ 97},{  8}}, {{225},{  8}}, {{ 17},{  8}}, {{145},{  8}},
+{{ 81},{  8}}, {{209},{  8}}, {{ 49},{  8}}, {{177},{  8}}, {{113},{  8}},
+{{241},{  8}}, {{  9},{  8}}, {{137},{  8}}, {{ 73},{  8}}, {{201},{  8}},
+{{ 41},{  8}}, {{169},{  8}}, {{105},{  8}}, {{233},{  8}}, {{ 25},{  8}},
+{{153},{  8}}, {{ 89},{  8}}, {{217},{  8}}, {{ 57},{  8}}, {{185},{  8}},
+{{121},{  8}}, {{249},{  8}}, {{  5},{  8}}, {{133},{  8}}, {{ 69},{  8}},
+{{197},{  8}}, {{ 37},{  8}}, {{165},{  8}}, {{101},{  8}}, {{229},{  8}},
+{{ 21},{  8}}, {{149},{  8}}, {{ 85},{  8}}, {{213},{  8}}, {{ 53},{  8}},
+{{181},{  8}}, {{117},{  8}}, {{245},{  8}}, {{ 13},{  8}}, {{141},{  8}},
+{{ 77},{  8}}, {{205},{  8}}, {{ 45},{  8}}, {{173},{  8}}, {{109},{  8}},
+{{237},{  8}}, {{ 29},{  8}}, {{157},{  8}}, {{ 93},{  8}}, {{221},{  8}},
+{{ 61},{  8}}, {{189},{  8}}, {{125},{  8}}, {{253},{  8}}, {{ 19},{  9}},
+{{275},{  9}}, {{147},{  9}}, {{403},{  9}}, {{ 83},{  9}}, {{339},{  9}},
+{{211},{  9}}, {{467},{  9}}, {{ 51},{  9}}, {{307},{  9}}, {{179},{  9}},
+{{435},{  9}}, {{115},{  9}}, {{371},{  9}}, {{243},{  9}}, {{499},{  9}},
+{{ 11},{  9}}, {{267},{  9}}, {{139},{  9}}, {{395},{  9}}, {{ 75},{  9}},
+{{331},{  9}}, {{203},{  9}}, {{459},{  9}}, {{ 43},{  9}}, {{299},{  9}},
+{{171},{  9}}, {{427},{  9}}, {{107},{  9}}, {{363},{  9}}, {{235},{  9}},
+{{491},{  9}}, {{ 27},{  9}}, {{283},{  9}}, {{155},{  9}}, {{411},{  9}},
+{{ 91},{  9}}, {{347},{  9}}, {{219},{  9}}, {{475},{  9}}, {{ 59},{  9}},
+{{315},{  9}}, {{187},{  9}}, {{443},{  9}}, {{123},{  9}}, {{379},{  9}},
+{{251},{  9}}, {{507},{  9}}, {{  7},{  9}}, {{263},{  9}}, {{135},{  9}},
+{{391},{  9}}, {{ 71},{  9}}, {{327},{  9}}, {{199},{  9}}, {{455},{  9}},
+{{ 39},{  9}}, {{295},{  9}}, {{167},{  9}}, {{423},{  9}}, {{103},{  9}},
+{{359},{  9}}, {{231},{  9}}, {{487},{  9}}, {{ 23},{  9}}, {{279},{  9}},
+{{151},{  9}}, {{407},{  9}}, {{ 87},{  9}}, {{343},{  9}}, {{215},{  9}},
+{{471},{  9}}, {{ 55},{  9}}, {{311},{  9}}, {{183},{  9}}, {{439},{  9}},
+{{119},{  9}}, {{375},{  9}}, {{247},{  9}}, {{503},{  9}}, {{ 15},{  9}},
+{{271},{  9}}, {{143},{  9}}, {{399},{  9}}, {{ 79},{  9}}, {{335},{  9}},
+{{207},{  9}}, {{463},{  9}}, {{ 47},{  9}}, {{303},{  9}}, {{175},{  9}},
+{{431},{  9}}, {{111},{  9}}, {{367},{  9}}, {{239},{  9}}, {{495},{  9}},
+{{ 31},{  9}}, {{287},{  9}}, {{159},{  9}}, {{415},{  9}}, {{ 95},{  9}},
+{{351},{  9}}, {{223},{  9}}, {{479},{  9}}, {{ 63},{  9}}, {{319},{  9}},
+{{191},{  9}}, {{447},{  9}}, {{127},{  9}}, {{383},{  9}}, {{255},{  9}},
+{{511},{  9}}, {{  0},{  7}}, {{ 64},{  7}}, {{ 32},{  7}}, {{ 96},{  7}},
+{{ 16},{  7}}, {{ 80},{  7}}, {{ 48},{  7}}, {{112},{  7}}, {{  8},{  7}},
+{{ 72},{  7}}, {{ 40},{  7}}, {{104},{  7}}, {{ 24},{  7}}, {{ 88},{  7}},
+{{ 56},{  7}}, {{120},{  7}}, {{  4},{  7}}, {{ 68},{  7}}, {{ 36},{  7}},
+{{100},{  7}}, {{ 20},{  7}}, {{ 84},{  7}}, {{ 52},{  7}}, {{116},{  7}},
+{{  3},{  8}}, {{131},{  8}}, {{ 67},{  8}}, {{195},{  8}}, {{ 35},{  8}},
+{{163},{  8}}, {{ 99},{  8}}, {{227},{  8}}
+};
+
+local const ct_data static_dtree[D_CODES] = {
+{{ 0},{ 5}}, {{16},{ 5}}, {{ 8},{ 5}}, {{24},{ 5}}, {{ 4},{ 5}},
+{{20},{ 5}}, {{12},{ 5}}, {{28},{ 5}}, {{ 2},{ 5}}, {{18},{ 5}},
+{{10},{ 5}}, {{26},{ 5}}, {{ 6},{ 5}}, {{22},{ 5}}, {{14},{ 5}},
+{{30},{ 5}}, {{ 1},{ 5}}, {{17},{ 5}}, {{ 9},{ 5}}, {{25},{ 5}},
+{{ 5},{ 5}}, {{21},{ 5}}, {{13},{ 5}}, {{29},{ 5}}, {{ 3},{ 5}},
+{{19},{ 5}}, {{11},{ 5}}, {{27},{ 5}}, {{ 7},{ 5}}, {{23},{ 5}}
+};
+
+local const uch dist_code[DIST_CODE_LEN] = {
+ 0,  1,  2,  3,  4,  4,  5,  5,  6,  6,  6,  6,  7,  7,  7,  7,  8,  8,  8,  8,
+ 8,  8,  8,  8,  9,  9,  9,  9,  9,  9,  9,  9, 10, 10, 10, 10, 10, 10, 10, 10,
+10, 10, 10, 10, 10, 10, 10, 10, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11,
+11, 11, 11, 11, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12,
+12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 13, 13, 13, 13,
+13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13,
+13, 13, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
+14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
+15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,  0,  0, 16, 17,
+18, 18, 19, 19, 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, 22, 22,
+23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+24, 24, 24, 24, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28,
+28, 28, 28, 28, 28, 28, 28, 28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29,
+29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29, 29
+};
+
+local const uch length_code[MAX_MATCH-MIN_MATCH+1]= {
+ 0,  1,  2,  3,  4,  5,  6,  7,  8,  8,  9,  9, 10, 10, 11, 11, 12, 12, 12, 12,
+13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 16, 16, 16, 16,
+17, 17, 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 19, 19, 19, 19,
+19, 19, 19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20,
+21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22,
+22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, 23, 23, 23, 23, 23, 23, 23,
+23, 23, 23, 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24,
+25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25,
+25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 25, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26, 26,
+26, 26, 26, 26, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27,
+27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 28
+};
+
+local const int base_length[LENGTH_CODES] = {
+0, 1, 2, 3, 4, 5, 6, 7, 8, 10, 12, 14, 16, 20, 24, 28, 32, 40, 48, 56,
+64, 80, 96, 112, 128, 160, 192, 224, 0
+};
+
+local const int base_dist[D_CODES] = {
+    0,     1,     2,     3,     4,     6,     8,    12,    16,    24,
+   32,    48,    64,    96,   128,   192,   256,   384,   512,   768,
+ 1024,  1536,  2048,  3072,  4096,  6144,  8192, 12288, 16384, 24576
+};
+

uncompr.c

@@ -1,9 +1,9 @@
 /* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995-1996 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 1.8 1996/01/30 21:59:26 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -22,7 +22,7 @@
    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;
     const Bytef *source;
@@ -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

@@ -1,9 +1,9 @@
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995-1996 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
@@ -27,6 +27,7 @@
 #  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
@@ -37,7 +38,7 @@
 #  define Byte		z_Byte
 #  define uInt		z_uInt
 #  define uLong		z_uLong
-/* #  define Bytef	z_Bytef */
+#  define Bytef	        z_Bytef
 #  define charf		z_charf
 #  define intf		z_intf
 #  define uIntf		z_uIntf
@@ -49,9 +50,11 @@
 #if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
 #  define WIN32
 #endif
-#if (defined(__GNUC__) || defined(WIN32)) && !defined(__32BIT__)
+#if defined(__GNUC__) || defined(WIN32) || defined(__386__) || defined(i386)
+#  ifndef __32BIT__
 #    define __32BIT__
 #  endif
+#endif
 #if defined(__MSDOS__) && !defined(MSDOS)
 #  define MSDOS
 #endif
@@ -70,9 +73,11 @@
 #if (defined(MSDOS) || defined(_WINDOWS) || defined(WIN32))  && !defined(STDC)
 #  define STDC
 #endif
-#if (defined(__STDC__) || defined(__cplusplus)) && !defined(STDC)
+#if defined(__STDC__) || defined(__cplusplus) || defined(__OS2__)
+#  ifndef STDC
 #    define STDC
 #  endif
+#endif
 
 #ifndef STDC
 #  ifndef const /* cannot use !defined(STDC) && !defined(const) on Mac */
@@ -80,11 +85,17 @@
 #  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 /* buggy compiler merges all .h files incorrectly */
+#  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
@@ -94,13 +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
@@ -128,7 +143,8 @@
  * to define NO_MEMCPY in zutil.h.  If you don't need the mixed model,
  * just define FAR to be empty.
  */
-#if defined(M_I86SM) || defined(M_I86MM) /* MSC small or medium model */
+#if (defined(M_I86SM) || defined(M_I86MM)) && !defined(__32BIT__)
+   /* MSC small or medium model */
 #  define SMALL_MEDIUM
 #  ifdef _MSC_VER
 #    define FAR __far
@@ -137,25 +153,25 @@
 #  endif
 #endif
 #if defined(__BORLANDC__) && (defined(__SMALL__) || defined(__MEDIUM__))
+#  ifndef __32BIT__
 #    define SMALL_MEDIUM
 #    define FAR __far
 #  endif
+#endif
 #ifndef FAR
 #   define FAR
 #endif
-/* The Watcom compiler defines M_I86SM and __SMALL__ even in 32 bit mode */
-#if defined(__WATCOMC__) && defined(__386__)
-#  undef FAR
-#  define FAR
-#  undef SMALL_MEDIUM
-#endif
 
 typedef unsigned char  Byte;  /* 8 bits */
 typedef unsigned int   uInt;  /* 16 bits or more */
 typedef unsigned long  uLong; /* 32 bits or more */
 
-/* "typedef Byte  FAR Bytef;" doesn't work with Borland C/C++ */
+#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;
@@ -169,4 +185,64 @@ typedef uLong FAR uLongf;
    typedef Byte     *voidp;
 #endif
 
+#ifdef HAVE_UNISTD_H
+#  include <sys/types.h> /* for off_t */
+#  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 "26 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 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/pub/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 1.0.8.
+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 1.0.1, May 20th, 1996.
+  version 1.0.8, Jan 27th, 1998
 
-  Copyright (C) 1995-1996 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
@@ -20,7 +20,12 @@
   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
@@ -32,30 +37,27 @@ extern "C" {
 
 #include "zconf.h"
 
-#define ZLIB_VERSION "1.0.1"
+#define ZLIB_VERSION "1.0.8"
 
 /* 
      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 does not install any signal handler. It is recommended to
+     The library also supports reading and writing files in gzip (.gz) format
-  add at least a handler for SIGSEGV when decompressing; the library checks
+  with an interface similar to that of stdio.
-  the consistency of the input data whenever possible but may go nuts
+
-  for some forms of corrupted input.
+     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 voidpf (*alloc_func) OF((voidpf opaque, uInt items, uInt size));
@@ -84,6 +86,8 @@ typedef struct z_stream_s {
     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
@@ -116,7 +120,7 @@ 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_SYNC_FLUSH    2
 #define Z_FULL_FLUSH    3
 #define Z_FINISH        4
@@ -156,16 +160,20 @@ typedef struct z_stream_s {
 
 #define Z_NULL  0  /* for initializing zalloc, zfree, opaque */
 
-extern const 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 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 deflateInit OF((z_stream *strm, int level));
+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.
@@ -187,9 +195,15 @@ extern int deflateInit OF((z_stream *strm, int level));
 */
 
 
-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
@@ -211,27 +225,26 @@ extern int deflate OF((z_stream *strm, int flush));
   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
-  Z_SYNC_FLUSH has the same effect as partial flush except that the compressed
+  before the call.)  Flushing may degrade compression for some compression
-  output is byte aligned (the compressor can clear its internal bit buffer)
+  algorithms and so it should be used only when necessary.
-  and the current block is always terminated; this can be useful if the
-  compressor has to be restarted from scratch after an interruption (in which
-  case the internal state of the compressor may be lost).
-    If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
-  special marker is output and the compression dictionary is discarded; this
-  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
@@ -243,6 +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
@@ -256,7 +272,7 @@ 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
@@ -271,24 +287,35 @@ extern int deflateEnd OF((z_stream *strm));
 
 
 /* 
-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, zfree and opaque must be initialized before by the caller.  If
+   next_in, avail_in, zalloc, zfree and opaque must be initialized before by
-   zalloc and zfree are set to Z_NULL, inflateInit updates them to use default
+   the caller. If next_in is not Z_NULL and avail_in is large enough (the exact
-   allocation 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, Z_VERSION_ERROR if the zlib library version is incompatible
+   memory, Z_VERSION_ERROR if the zlib library version is incompatible with the
-   with the version assumed by the caller.  msg is set to null if there is no
+   version assumed by the caller.  msg is set to null if there is no error
-   error message. inflateInit does not perform any decompression: this will be
+   message. inflateInit does not perform any decompression apart from reading
-   done by inflate().
+   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
@@ -309,9 +336,9 @@ extern int inflate OF((z_stream *strm, int flush));
   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.
 
@@ -326,22 +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_NEED_DICT if a preset dictionary is needed at this point (see
+  it sets strm->adler to the adler32 checksum of all output produced
-  inflateSetDictionary below), Z_DATA_ERROR if the input data was corrupted,
+  so far (that is, total_out bytes) and returns Z_OK, Z_STREAM_END or
-  Z_STREAM_ERROR if the stream structure was inconsistent (for example if
+  an error code as described below. At the end of the stream, inflate()
-  next_in or next_out was NULL), Z_MEM_ERROR if there was not enough memory,
+  checks that its computed adler32 checksum is equal to that saved by the
-  Z_BUF_ERROR if no progress is possible or if there was not enough room in
+  compressor and returns Z_STREAM_END only if the checksum is correct.
-  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.
+    inflate() returns Z_OK if some progress has been made (more input processed
-  In the Z_NEED_DICT case, strm->adler is set to the Adler32 value of the
+  or more output produced), Z_STREAM_END if the end of the compressed data has
-  dictionary chosen by the compressor.
+  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
@@ -359,7 +394,7 @@ extern int inflateEnd OF((z_stream *strm));
 */
 
 /*   
-extern int deflateInit2 OF((z_stream *strm,
+extern int EXPORT deflateInit2 OF((z_streamp strm,
                                    int  level,
                                    int  method,
                                    int  windowBits,
@@ -371,14 +406,13 @@ extern int deflateInit2 OF((z_stream *strm,
    the caller.
 
      The method parameter is the compression method. It must be Z_DEFLATED in
-   this version of the library. (Method 9 will allow a 64K history buffer and
+   this version of the library.
-   partial block flushes.)
 
      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
@@ -397,42 +431,35 @@ extern int deflateInit2 OF((z_stream *strm,
    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 deflateSetDictionary OF((z_stream *strm,
+extern int EXPORT deflateSetDictionary OF((z_streamp strm,
                                            const Bytef *dictionary,
 				           uInt  dictLength));
 /*
-     Initializes the compression dictionary (history buffer) from the given
+     Initializes the compression dictionary from the given byte sequence
-   byte sequence without producing any compressed output. This function must
+   without producing any compressed output. This function must be called
-   be called immediately after deflateInit or deflateInit2, before any call
+   immediately after deflateInit or deflateInit2, before any call of
-   of deflate. The compressor and decompressor must use exactly the same
+   deflate. The compressor and decompressor must use exactly the same
    dictionary (see inflateSetDictionary).
+
      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
+   dictionary is most useful when the data to be compressed is short and can be
-   can be predicted with good accuracy; the data can then be compressed better
+   predicted with good accuracy; the data can then be compressed better than
-   than with the default empty dictionary. In this version of the library,
+   with the default empty dictionary.
-   only the last 32K bytes of the dictionary are used.
+
+     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
@@ -440,21 +467,16 @@ extern int deflateSetDictionary OF((z_stream *strm,
    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
+   parameter is invalid (such as NULL dictionary) or the stream state is
-   is inconsistent (for example if deflate has already been called for this
+   inconsistent (for example if deflate has already been called for this stream
-   stream). deflateSetDictionary does not perform any compression: this will
+   or if the compression method is bsort). deflateSetDictionary does not
-   be done by deflate(). 
+   perform any compression: this will be done by deflate().
 */
 
-extern int deflateCopy OF((z_stream *dest,
+extern int EXPORT deflateCopy OF((z_streamp dest,
-                           z_stream *source));
+                                  z_streamp source));
 /*
-     Sets the destination stream as a complete copy of the source stream.  If
+     Sets the destination stream as a complete copy of the source stream.
-   the source stream is using an application-supplied history buffer, a new
-   buffer is allocated for the destination stream.  The compressed output
-   buffer is always application-supplied. It's the responsibility of the
-   application to provide the correct values of next_out and avail_out for the
-   next call of deflate.
 
      This function can be useful when several compression strategies will be
    tried, for example when there are several ways of pre-processing the input
@@ -469,7 +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.
@@ -480,14 +502,15 @@ extern int deflateReset OF((z_stream *strm));
    stream state was inconsistent (such as zalloc or state being NULL).
 */
 
-extern int deflateParams OF((z_stream *strm, int level, int strategy));
+extern int EXPORT deflateParams OF((z_streamp strm, int level, int strategy));
 /*
-     Dynamically update the compression level and compression strategy.
+     Dynamically update the compression level and compression strategy.  The
-   This can be used to switch between compression and straight copy of
+   interpretation of level and strategy is as in deflateInit2.  This can be
-   the input data, or to switch to a different kind of input data requiring
+   used to switch between compression and straight copy of the input data, or
-   a different strategy. If the compression level is changed, the input
+   to switch to a different kind of input data requiring a different
-   available so far is compressed with the old level (and may be flushed);
+   strategy. If the compression level is changed, the input available so far
-   the new level will take effect only at the next call of deflate().
+   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
@@ -499,49 +522,37 @@ extern int deflateParams OF((z_stream *strm, int level, int strategy));
 */
 
 /*   
-extern int inflateInit2 OF((z_stream *strm,
+extern int EXPORT inflateInit2 OF((z_streamp strm,
                                    int  windowBits));
 
-     This is another version of inflateInit with more compression options. The
+     This is another version of inflateInit with an extra parameter. The
-   fields next_out, zalloc, zfree and opaque must be initialized before by
+   fields next_in, avail_in, zalloc, zfree and opaque must be initialized
-   the caller.
+   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
-   never be changed by the application since the decompressor maintains
-   history information inside this buffer from call to call; the application
-   can only reset next_out to the beginning of the history buffer when
-   avail_out is zero and all output has been consumed.
-
-      inflateInit2 returns Z_OK if success, Z_MEM_ERROR if there was
-   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
-   windowBits < 8). msg is set to null if there is no error message.
-   inflateInit2 does not perform any decompression: this will be done by
-   inflate().
 */
 
-extern int inflateSetDictionary OF((z_stream *strm,
+extern int EXPORT inflateSetDictionary OF((z_streamp strm,
 				           const Bytef *dictionary,
 					   uInt  dictLength));
 /*
-     Initializes the decompression dictionary (history buffer) from the given
+     Initializes the decompression dictionary from the given uncompressed byte
-   uncompressed byte sequence. This function must be called immediately after
+   sequence. This function must be called immediately after a call of inflate
-   a call of inflate if this call returned Z_NEED_DICT. The dictionary chosen
+   if this call returned Z_NEED_DICT. The dictionary chosen by the compressor
-   by the compressor can be determined from the Adler32 value returned by this
+   can be determined from the Adler32 value returned by this call of
-   call of inflate. The compressor and decompressor must use exactly the same
+   inflate. The compressor and decompressor must use exactly the same
    dictionary (see deflateSetDictionary).
 
      inflateSetDictionary returns Z_OK if success, Z_STREAM_ERROR if a
@@ -552,14 +563,14 @@ extern int inflateSetDictionary OF((z_stream *strm,
    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
@@ -567,7 +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.
@@ -583,12 +594,12 @@ 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,
 			       const Bytef *source, uLong sourceLen));
 /*
      Compresses the source buffer into the destination buffer.  sourceLen is
@@ -603,7 +614,22 @@ extern int compress OF((Bytef *dest,   uLongf *destLen,
    buffer.
 */
 
-extern int uncompress OF((Bytef *dest,   uLongf *destLen,
+extern int EXPORT compress2 OF((Bytef *dest,   uLongf *destLen,
+	 		        const Bytef *source, uLong sourceLen,
+				int level));
+/*
+     Compresses the source buffer into the destination buffer. The level
+   parameter has the same meaning as in deflateInit.  sourceLen is the byte
+   length of the source buffer. Upon entry, destLen is the total size of the
+   destination buffer, which must be at least 0.1% larger than sourceLen plus
+   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.
+
+     compress2 returns Z_OK if success, Z_MEM_ERROR if there was not enough
+   memory, Z_BUF_ERROR if there was not enough room in the output buffer,
+   Z_STREAM_ERROR if the level parameter is invalid.
+*/
+
+extern int EXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
 				 const Bytef *source, uLong sourceLen));
 /*
      Decompresses the source buffer into the destination buffer.  sourceLen is
@@ -624,19 +650,23 @@ extern int uncompress OF((Bytef *dest,   uLongf *destLen,
 
 typedef voidp gzFile;
 
-extern gzFile gzopen  OF((const char *path, const 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, const 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, pipe or
@@ -649,7 +679,15 @@ extern gzFile gzdopen  OF((int fd, const char *mode));
    the (de)compression state.
 */
 
-extern int    gzread  OF((gzFile file, voidp 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
@@ -657,14 +695,33 @@ extern int    gzread  OF((gzFile file, voidp 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, const voidp 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
@@ -674,14 +731,53 @@ 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
@@ -698,7 +794,7 @@ extern char*   gzerror OF((gzFile file, int *errnum));
    compression library.
 */
 
-extern uLong adler32 OF((uLong adler, const 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
@@ -715,7 +811,7 @@ extern uLong adler32 OF((uLong adler, const Bytef *buf, uInt len));
      if (adler != original_adler) error();
 */
 
-extern uLong crc32   OF((uLong crc, const 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
@@ -737,14 +833,14 @@ extern uLong crc32   OF((uLong crc, const Bytef *buf, uInt len));
 /* deflateInit and inflateInit are macros to allow checking the zlib version
  * and the compiler's view of z_stream:
  */
-extern int deflateInit_ OF((z_stream *strm, int level,
+extern int EXPORT deflateInit_ OF((z_streamp strm, int level,
 			           const char *version, int stream_size));
-extern int inflateInit_ OF((z_stream *strm,
+extern int EXPORT inflateInit_ OF((z_streamp strm,
 				   const char *version, int stream_size));
-extern int deflateInit2_ OF((z_stream *strm, int  level, int  method,
+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 inflateInit2_ OF((z_stream *strm, int  windowBits,
+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))
@@ -756,11 +852,14 @@ extern int inflateInit2_ OF((z_stream *strm, int  windowBits,
 #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
 
-uLongf *get_crc_table OF((void)); /* can be used by asm versions of crc32() */
+extern const char   * EXPORT zError           OF((int err));
+extern int            EXPORT inflateSyncPoint OF((z_streamp z));
+extern const uLongf * EXPORT get_crc_table    OF((void));
 
 #ifdef __cplusplus
 }

ztest28975.c

@@ -0,0 +1 @@
+int hello() {return 0;}

zutil.c

@@ -1,11 +1,9 @@
 /* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995-1996 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 1.12 1996/01/30 21:59:29 me Exp $ */
+/* @(#) $Id$ */
-
-#include <stdio.h>
 
 #include "zutil.h"
 
@@ -15,8 +13,6 @@ struct internal_state      {int dummy;}; /* for buggy compilers */
 extern void exit OF((int));
 #endif
 
-const char *zlib_version = ZLIB_VERSION;
-
 const char *z_errmsg[10] = {
 "need dictionary",     /* Z_NEED_DICT       2  */
 "stream end",          /* Z_STREAM_END      1  */
@@ -30,12 +26,35 @@ const char *z_errmsg[10] = {
 ""};
 
 
+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
 
@@ -50,6 +69,19 @@ 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)
     Bytef* dest;
     uInt  len;
@@ -135,14 +167,14 @@ void  zcfree (voidpf opaque, voidpf 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(M_I86) && !(defined(__WATCOMC__) && defined(__386__))
+#if defined(M_I86) && !defined(__32BIT__)
-/* Microsoft C */
+/* Microsoft C in 16-bit mode */
 
 #  define MY_ZCALLOC
 

zutil.h

@@ -1,5 +1,5 @@
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
@@ -8,23 +8,23 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.13 1996/01/30 21:59:29 me Exp $ */
+/* @(#) $Id$ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
 
 #include "zlib.h"
 
-#if defined(MSDOS) || defined(VMS) || defined(CRAY) || defined(WIN32)
-#   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
 #  define local static
@@ -40,10 +40,10 @@ typedef unsigned long  ulg;
 extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 /* (size given to avoid silly warnings with Visual C++) */
 
-#define ERR_MSG(err) (char*)z_errmsg[Z_NEED_DICT-(err)]
+#define ERR_MSG(err) z_errmsg[Z_NEED_DICT-(err)]
 
 #define ERR_RETURN(strm,err) \
-  return (strm->msg = ERR_MSG(err), (err))
+  return (strm->msg = (char*)ERR_MSG(err), (err))
 /* To be used only when the state is known to be valid */
 
         /* common constants */
@@ -76,7 +76,13 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #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>
+#    endif
 #  else /* MSC or DJGPP */
 #    include <malloc.h>
 #  endif
@@ -92,7 +98,7 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 
 #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
 
@@ -104,8 +110,16 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  define OS_CODE  0x05
 #endif
 
-#ifdef MACOS
+#if defined(MACOS) || defined(TARGET_OS_MAC)
 #  define OS_CODE  0x07
+#  ifndef fdopen
+#    define fdopen(fd,mode) NULL /* No fdopen() */
+#  endif
+#endif
+#if defined(__MWERKS__) && !defined(fdopen)
+#  if __dest_os != __be_os && __dest_os != __win32_os
+#    define fdopen(fd,mode) NULL
+#  endif
 #endif
 
 #ifdef __50SERIES /* Prime/PRIMOS */
@@ -116,18 +130,23 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  define OS_CODE  0x0a
 #endif
 
-#ifdef _BEOS_
+#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 */
@@ -142,9 +161,10 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #if defined(pyr)
 #  define NO_MEMCPY
 #endif
-#if (defined(M_I86SM) || defined(M_I86MM)) && !defined(_MSC_VER)
+#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
@@ -163,21 +183,21 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #  endif
 #else
    extern void zmemcpy  OF((Bytef* dest, Bytef* source, 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)
@@ -188,10 +208,8 @@ extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
 #endif
 
 
-typedef uLong (*check_func) OF((uLong check, const 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));