zlib 0.91

ChangeLog

@@ -1,5 +1,37 @@
 		ChangeLog file for zlib
 
+Changes in 0.91 (2 May 95)
+- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
+- Document the memory requirements in zconf.h
+- added "make install"
+- fix sync search logic in inflateSync
+- deflate(Z_FULL_FLUSH) now works even if output buffer too short
+- after inflateSync, don't scare people with just "lo world"
+- added support for DJGPP
+
+Changes in 0.9 (1 May 95)
+- don't assume that zalloc clears the allocated memory (the TurboC bug
+  was Mark's bug after all :)
+- let again gzread copy uncompressed data unchanged (was working in 0.71)
+- deflate(Z_FULL_FLUSH), inflateReset and inflateSync are now fully implemented
+- added a test of inflateSync in example.c
+- moved MAX_WBITS to zconf.h because users might want to change that.
+- document explicitly that zalloc(64K) on MSDOS must return a normalized
+  pointer (zero offset)
+- added Makefiles for Microsoft C, Turbo C, Borland C++
+- faster crc32()
+
+Changes in 0.8 (29 April 95)
+- added fast inflate (inffast.c)
+- deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
+  is incompatible with previous versions of zlib which returned Z_OK.
+- work around a TurboC compiler bug (bad code for b << 0, see infutil.h)
+  (actually that was not a compiler bug, see 0.81 above)
+- gzread no longer reads one extra byte in certain cases
+- In gzio destroy(), don't reference a freed structure
+- avoid many warnings for MSDOS
+- avoid the ERROR symbol which is used by MS Windows
+
 Changes in 0.71 (14 April 95)
 - Fixed more MSDOS compilation problems :( There is still a bug with
   TurboC large model.

Makefile

@@ -1,12 +1,19 @@
+# Makefile for zlib
+# Copyright (C) 1995 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h 
+
 CC=cc
 CFLAGS=-O
+#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
 #CFLAGS=-g -DDEBUG
 LDFLAGS=-L. -lgz
 
 RANLIB=ranlib
 
+prefix=/usr/local
+
 OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
 
 TEST_OBJS = example.o minigzip.o inftest.o
 
@@ -16,6 +23,14 @@ test: all
 	./example
 	echo hello world | ./minigzip | ./minigzip -d 
 
+install: libgz.a
+	-@mkdir $(prefix)/include
+	-@mkdir $(prefix)/lib
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp libgz.a $(prefix)/lib
+	chmod 644 $(prefix)/lib/libgz.a
+
 libgz.a: $(OBJS)
 	ar rc $@ $(OBJS)
 	$(RANLIB) $@
@@ -33,11 +48,11 @@ clean:
 	rm -f *.o example minigzip inftest libgz.a foo.gz
 
 zip:
-	zip -ul9 zlib README ChangeLog Makefile *.[ch]
+	zip -ul9 zlib README ChangeLog Makefile Makefile.??? Makefile.?? *.[ch]
 
 tgz:
 	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-		zlib/*.[ch]
+		zlib/Makefile.??? zlib/Makefile.?? zlib/*.[ch]
 
 # DO NOT DELETE THIS LINE -- make depend depends on it.
 
@@ -48,7 +63,8 @@ deflate.o: deflate.h zutil.h zlib.h zconf.h
 example.o: zlib.h zconf.h
 gzio.o: zutil.h zlib.h zconf.h
 infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h
+infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
 inflate.o: zutil.h zlib.h zconf.h infblock.h
 inftest.o: zutil.h zlib.h zconf.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h

Makefile.bor

@@ -0,0 +1,101 @@
+# Makefile for zlib
+# Borland C++   ************ UNTESTED ***********
+
+# To use, do "make -fmakefile.bor"
+
+# WARNING: the small model is supported but only for small values of
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------- Turbo C++, Borland C++ -------------
+MODEL=-ml
+CFLAGS=-O2 -Z $(MODEL)
+CC=bcc
+LD=bcc
+LIB=tlib
+#   replace bcc with tcc for Turbo C++ 1.0
+LDFLAGS=$(MODEL)
+O=.obj
+
+# variables
+OBJ1 = adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) \
+  trees$(O)
+OBJP1 = adler32$(O)+compress$(O)+crc32$(O)+gzio$(O)+uncompr$(O)+deflate$(O)+\
+  trees$(O)
+OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
+  infutil$(O) inffast$(O)
+OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
+  infutil$(O)+inffast$(O)
+
+all: test
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h\
+   infcodes.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h\
+   infcodes.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+# we must cut the command line to fit in the MS/DOS 128 byte limit:
+zlib.lib: $(OBJ1) $(OBJ2)
+	$(LIB) zlib +$(OBJP1)
+	$(LIB) zlib +$(OBJP2)
+
+example.exe: example.obj zlib.lib
+	$(LD) $(LDFLAGS) example.obj zlib.lib
+
+minigzip.exe: minigzip.obj zlib.lib
+	$(LD) $(LDFLAGS) minigzip.obj zlib.lib
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d 
+
+#clean:
+#	del *.obj
+#	del *.exe

Makefile.msc

@@ -0,0 +1,98 @@
+# Makefile for zlib
+# Microsoft C 5.1 or later
+
+# To use, do "make makefile.msc"
+
+# WARNING: the small model is supported but only for small values of
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------- Microsoft C 5.1 and later -------------
+MODEL=-AL
+CFLAGS=-Oait -Gs -nologo -W3 $(MODEL)
+#-Ox generates bad code with MSC 5.1
+CC=cl
+LD=link
+LDFLAGS=/e/st:0x1000/noe
+O=.obj
+
+# variables
+OBJ1 = adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) \
+  trees$(O)
+OBJP1 = adler32$(O)+compress$(O)+crc32$(O)+gzio$(O)+uncompr$(O)+deflate$(O)+\
+  trees$(O)
+OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
+  infutil$(O) inffast$(O)
+OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
+  infutil$(O)+inffast$(O)
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h\
+   infcodes.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h\
+   infcodes.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+# we must cut the command line to fit in the MS/DOS 128 byte limit:
+zlib.lib: $(OBJ1) $(OBJ2)
+	lib zlib $(OBJ1);
+	lib zlib $(OBJ2);
+
+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

Makefile.tc

@@ -0,0 +1,100 @@
+# Makefile for zlib
+# TurboC 2.0
+
+# To use, do "make -fmakefile.tc"
+
+# WARNING: the small model is supported but only for small values of
+# MAX_WBITS and MAX_MEM_LEVEL. If you wish to reduce the memory
+# requirements (default 256K for big objects plus a few K), you can add
+# to CFLAGS below: -DMAX_MEM_LEVEL=7 -DMAX_WBITS=14
+# See zconf.h for details about the memory requirements.
+
+# ------------- Turbo C 2.0 -------------
+MODEL=-ml
+CFLAGS=-O2 -Z $(MODEL)
+CC=tcc
+LD=tcc
+LIB=tlib
+LDFLAGS=$(MODEL)
+O=.obj
+
+# variables
+OBJ1 = adler32$(O) compress$(O) crc32$(O) gzio$(O) uncompr$(O) deflate$(O) \
+  trees$(O)
+OBJP1 = adler32$(O)+compress$(O)+crc32$(O)+gzio$(O)+uncompr$(O)+deflate$(O)+\
+  trees$(O)
+OBJ2 = zutil$(O) inflate$(O) infblock$(O) inftrees$(O) infcodes$(O) \
+  infutil$(O) inffast$(O)
+OBJP2 = zutil$(O)+inflate$(O)+infblock$(O)+inftrees$(O)+infcodes$(O)+\
+  infutil$(O)+inffast$(O)
+
+all: test
+
+adler32.obj: adler32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+compress.obj: compress.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+crc32.obj: crc32.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+deflate.obj: deflate.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+gzio.obj: gzio.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infblock.obj: infblock.c zutil.h zlib.h zconf.h infblock.h inftrees.h\
+   infcodes.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infcodes.obj: infcodes.c zutil.h zlib.h zconf.h inftrees.h infutil.h\
+   infcodes.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inflate.obj: inflate.c zutil.h zlib.h zconf.h infblock.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inftrees.obj: inftrees.c zutil.h zlib.h zconf.h inftrees.h
+	$(CC) -c $(CFLAGS) $*.c
+
+infutil.obj: infutil.c zutil.h zlib.h zconf.h inftrees.h infutil.h
+	$(CC) -c $(CFLAGS) $*.c
+
+inffast.obj: inffast.c zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+	$(CC) -c $(CFLAGS) $*.c
+
+trees.obj: trees.c deflate.h zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+uncompr.obj: uncompr.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+zutil.obj: zutil.c zutil.h zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+example.obj: example.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+minigzip.obj: minigzip.c zlib.h zconf.h
+	$(CC) -c $(CFLAGS) $*.c
+
+# we must cut the command line to fit in the MS/DOS 128 byte limit:
+zlib.lib: $(OBJ1) $(OBJ2)
+	$(LIB) zlib +$(OBJP1)
+	$(LIB) zlib +$(OBJP2)
+
+example.exe: example.obj zlib.lib
+	$(LD) $(LDFLAGS) -eexample.exe example.obj zlib.lib
+
+minigzip.exe: minigzip.obj zlib.lib
+	$(LD) $(LDFLAGS) -eminigzip.exe minigzip.obj zlib.lib
+
+test: example.exe minigzip.exe
+	example
+	echo hello world | minigzip | minigzip -d 
+
+#clean:
+#	del *.obj
+#	del *.exe

README

@@ -1,29 +1,31 @@
-zlib 0.71 is a beta version of a general purpose compression library.
+zlib 0.91 is a beta version of a general purpose compression library.
 
 The data format used by the zlib library is described in the
-file zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
+files zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
 in ftp.uu.net:/pub/archiving/zip/doc.
 
 All functions of the compression library are documented in the file
 zlib.h. A usage example of the library is given in the file example.c
 which also tests that the library is working correctly.
+
 To compile all files and run the test program, just type: make test
+(For MSDOS, use one of the special makefiles such as Makefile.msc.)
+To install the zlib library (libgz.a) in /usr/local/lib, type: make install
+To install in a different directory, use for example: make install prefix=$HOME
+This will install in $HOME/lib instead of /usr/local/lib.
 
-The changes made in version 0.71 are documented in the file ChangeLog.
+The changes made in version 0.91 are documented in the file ChangeLog.
-The main changes since 0.5 are:
+The main changes since 0.9 are:
-- added full inflate support
+- Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
-- added minigzip.c
+- Document the memory requirements in zconf.h
-- added gzdopen to reopen a file descriptor as gzFile
+- added "make install"
-- added transparent reading of non-gziped files in gzread.
+- added support for DJGPP
-- fix some MSDOS problems. example and minigzip now work on MSDOS.
-- Simplified the crc32() interface. The pre- and post-conditioning
-  (one's complement) is now done inside crc32(). WARNING: this is
-  incompatible with previous versions; see zlib.h for the new usage.
 
-On MSDOS, this version works in large and small model with MSC; in
+On MSDOS, this version works in both large and small model. However
-small model only with TurboC (bug being investigated). For both
+small model compression works only for small values of MAX_MEM_LEVEL
-compilers, small model compression works only for small values of
+and MAX_WBITS (see zconf.h). Small model decompression should work up
-MEM_LEVEL and WBITS (see zutil.h), and requires -DUSE_CALLOC.
+to MAX_WBITS=15.  This version of zlib does not support small or
+medium model with far allocation of big objects.
 
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler

compress.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: compress.c,v 1.4 1995/04/10 15:52:04 jloup Exp $ */
+/* $Id: compress.c,v 1.5 1995/04/29 17:18:43 jloup Exp $ */
 
 #include "zlib.h"
 
@@ -44,9 +44,9 @@ int compress (dest, destLen, source, sourceLen)
     if (err != Z_OK) return err;
 
     err = deflate(&stream, Z_FINISH);
-    if (err != Z_OK) {
+    if (err != Z_STREAM_END) {
 	deflateEnd(&stream);
-	return err;
+	return err == Z_OK ? Z_BUF_ERROR : err;
     }
     *destLen = stream.total_out;
 

crc32.c

@@ -3,12 +3,17 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: crc32.c,v 1.4 1995/04/14 14:55:12 jloup Exp $ */
+/* $Id: crc32.c,v 1.5 1995/05/01 13:55:46 jloup Exp $ */
 
 #include "zlib.h"
 
 extern uLong crc_table[];   /* crc table, defined below */
 
+#define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
+#define DO2(buf)  DO1(buf); DO1(buf);
+#define DO4(buf)  DO2(buf); DO2(buf);
+#define DO8(buf)  DO4(buf); DO4(buf);
+
 /* ========================================================================= */
 uLong crc32(crc, buf, len)
     uLong crc;
@@ -17,8 +22,13 @@ uLong crc32(crc, buf, len)
 {
     if (buf == Z_NULL) return 0L;
     crc = crc ^ 0xffffffffL;
+    while (len >= 8)
+    {
+      DO8(buf);
+      len -= 8;
+    }
     if (len) do {
-	crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
+      DO1(buf);
     } while (--len);
     return crc ^ 0xffffffffL;
 }
@@ -29,7 +39,7 @@ uLong crc32(crc, buf, len)
  */
 #ifdef DYNAMIC_CRC_TABLE
 
-void make_crc_table()
+local void make_crc_table()
 {
   uLong c;
   int n, k;

deflate.c

@@ -47,7 +47,7 @@
  *
  */
 
-/* $Id: deflate.c,v 1.3 1995/04/10 16:03:45 jloup Exp $ */
+/* $Id: deflate.c,v 1.7 1995/05/02 13:28:18 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -117,8 +117,10 @@ local void fill_window   __P((deflate_state *s));
 local int  deflate_fast  __P((deflate_state *s, int flush));
 local int  deflate_slow  __P((deflate_state *s, int flush));
 local void lm_init       __P((deflate_state *s));
-
 local int  longest_match __P((deflate_state *s, IPos cur_match));
+local void putShortMSB   __P((deflate_state *s, uInt b));
+local void flush_pending __P((z_stream *strm));
+local int read_buf       __P((z_stream *strm, char *buf, unsigned size));
 #ifdef ASMV
       void match_init __P((void)); /* asm code initialization */
 #endif
@@ -150,12 +152,20 @@ local  void check_match __P((deflate_state *s, IPos start, IPos match,
     s->prev[(str) & s->w_mask] = match_head = s->head[s->ins_h], \
     s->head[s->ins_h] = (str))
 
+/* ===========================================================================
+ * Initialize the hash table (avoiding 64K overflow for 16 bit systems).
+ * prev[] will be initialized on the fly.
+ */
+#define CLEAR_HASH(s) \
+    s->head[s->hash_size-1] = NIL; \
+    zmemzero((char*)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
+
 /* ========================================================================= */
 int deflateInit (strm, level)
     z_stream *strm;
     int level;
 {
-    return deflateInit2 (strm, level, DEFLATED, WBITS, MEM_LEVEL, 0);
+    return deflateInit2 (strm, level, DEFLATED, MAX_WBITS, DEF_MEM_LEVEL, 0);
     /* To do: ignore strm->next_in if we use it as window */
 }
 
@@ -195,9 +205,11 @@ int deflateInit2 (strm, level, method, windowBits, memLevel, strategy)
     s->noheader = noheader;
     s->w_bits = windowBits;
     s->w_size = 1 << s->w_bits;
+    s->w_mask = s->w_size - 1;
 
     s->hash_bits = memLevel + 7;
     s->hash_size = 1 << s->hash_bits;
+    s->hash_mask = s->hash_size - 1;
     s->hash_shift =  ((s->hash_bits+MIN_MATCH-1)/MIN_MATCH);
 
     s->window = (Byte*) ZALLOC(strm, s->w_size, 2*sizeof(Byte));
@@ -223,7 +235,7 @@ int deflateInit2 (strm, level, method, windowBits, memLevel, strategy)
 
     s->level = level;
     s->strategy = strategy;
-    s->method = method;
+    s->method = (Byte)method;
 
     return deflateReset(strm);
 }
@@ -263,8 +275,8 @@ local void putShortMSB (s, b)
     deflate_state *s;
     uInt b;
 {
-    put_byte(s, b >> 8);
+    put_byte(s, (Byte)(b >> 8));
-    put_byte(s, b & 0xff);
+    put_byte(s, (Byte)(b & 0xff));
 }   
 
 /* =========================================================================
@@ -332,29 +344,38 @@ int deflate (strm, flush)
      */
     if (strm->avail_in != 0 ||
 	(flush == Z_FINISH && strm->state->status != FINISH_STATE)) {
+	int quit;
 	
 	if (flush == Z_FINISH) {
 	    strm->state->status = FINISH_STATE;
 	}
         if (strm->state->level <= 3) {
-	    if (deflate_fast(strm->state, flush)) return Z_OK;
+	    quit = deflate_fast(strm->state, flush);
 	} else {
-	    if (deflate_slow(strm->state, flush)) return Z_OK;
+	    quit = deflate_slow(strm->state, flush);
 	}
+	if (flush == Z_FULL_FLUSH) {
+	    ct_stored_block(strm->state, (char*)0, 0L, 0); /* special marker */
+	    flush_pending(strm);
+	    CLEAR_HASH(strm->state);             /* forget history */
+	    if (strm->avail_out == 0) return Z_OK;
+	}
+	if (quit) return Z_OK;
     }
     Assert(strm->avail_out > 0, "bug2");
 
-    if (flush != Z_FINISH || strm->state->noheader) return Z_OK;
+    if (flush != Z_FINISH) return Z_OK;
+    if (strm->state->noheader) return Z_STREAM_END;
 
     /* Write the zlib trailer (adler32) */
-    putShortMSB(strm->state, strm->state->adler >> 16);
+    putShortMSB(strm->state, (uInt)(strm->state->adler >> 16));
-    putShortMSB(strm->state, strm->state->adler & 0xffff);
+    putShortMSB(strm->state, (uInt)(strm->state->adler & 0xffff));
     flush_pending(strm);
     /* If avail_out is zero, the application will call deflate again
      * to flush the rest.
      */
     strm->state->noheader = 1; /* write the trailer only once! */
-    return Z_OK;
+    return strm->state->pending != 0 ? Z_OK : Z_STREAM_END;
 }
 
 /* ========================================================================= */
@@ -430,12 +451,7 @@ local void lm_init (s)
 
     s->window_size = (ulg)2L*s->w_size;
 
-
+    CLEAR_HASH(s);
-    /* Initialize the hash table (avoiding 64K overflow for 16 bit systems).
-     * prev[] will be initialized on the fly.
-     */
-    s->head[s->hash_size-1] = NIL;
-    zmemzero((char*)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
 
     /* Set the default configuration parameters:
      */
@@ -925,8 +941,10 @@ local int deflate_slow(s, flush)
             s->lookahead--;
         }
     }
-    if (s->match_available) ct_tally (s, 0, s->window[s->strstart-1]);
+    if (s->match_available) {
-
+	ct_tally (s, 0, s->window[s->strstart-1]);
+	s->match_available = 0;
+    }
     FLUSH_BLOCK(s, flush == Z_FINISH);
     return 0;
 }

deflate.h

@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: deflate.h,v 1.3 1995/04/14 12:39:45 jloup Exp $ */
+/* $Id: deflate.h,v 1.4 1995/05/01 15:08:45 jloup Exp $ */
 
 #include "zutil.h"
 
@@ -268,3 +268,5 @@ typedef struct internal_state {
 void ct_init       __P((deflate_state *s));
 int  ct_tally      __P((deflate_state *s, int dist, int lc));
 ulg ct_flush_block __P((deflate_state *s, char *buf, ulg stored_len, int eof));
+void ct_stored_block __P((deflate_state *s, char *buf, ulg stored_len,
+			  int eof));

example.c

@@ -3,11 +3,19 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.4 1995/04/14 13:32:49 jloup Exp $ */
+/* $Id: example.c,v 1.8 1995/05/02 15:52:32 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
+#ifdef STDC
+#  include <string.h>
+#endif
+
+#ifndef __GO32__
+extern void exit  __P((int));
+#endif
+
 #define BUFLEN 4096
 
 #define local static
@@ -25,6 +33,12 @@
 
 char *hello = "hello world";
 
+void test_compress __P((void));
+void test_gzio     __P((char *out, char *in));
+void test_deflate  __P((Byte compr[]));
+void test_inflate  __P((Byte compr[]));
+void main          __P((int argc, char *argv[]));
+
 /* ===========================================================================
  * Test compress() and uncompress()
  */
@@ -37,15 +51,15 @@ void test_compress()
     int err;
     uLong len = strlen(hello)+1;
 
-    err = compress(compr, &comprLen, hello, len);
+    err = compress(compr, &comprLen, (Byte*)hello, len);
     CHECK_ERR(err, "compress");
 
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     err = uncompress(uncompr, &uncomprLen, compr, comprLen);
     CHECK_ERR(err, "uncompress");
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
 	fprintf(stderr, "bad uncompress\n");
     } else {
 	printf("uncompress(): %s\n", uncompr);
@@ -60,7 +74,7 @@ void test_gzio(out, in)
     char *in;  /* input file */
 {
     local Byte uncompr[BUFLEN];
-    uLong uncomprLen = sizeof(uncompr);
+    int uncomprLen = sizeof(uncompr);
     int err;
     int len = strlen(hello)+1;
     gzFile file;
@@ -80,7 +94,7 @@ void test_gzio(out, in)
     if (file == NULL) {
 	fprintf(stderr, "gzopen error\n");
     }
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     uncomprLen = gzread(file, uncompr, uncomprLen);
     if (uncomprLen != len) {
@@ -88,7 +102,7 @@ void test_gzio(out, in)
     }
     gzclose(file);
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
 	fprintf(stderr, "bad gzread\n");
     } else {
 	printf("gzread(): %s\n", uncompr);
@@ -96,9 +110,9 @@ void test_gzio(out, in)
 }
 
 /* ===========================================================================
- * Test deflate() with small buffers, return the compressed length.
+ * Test deflate() with small buffers
  */
-uLong test_deflate(compr)
+void test_deflate(compr)
     Byte compr[];
 {
     z_stream c_stream; /* compression stream */
@@ -114,22 +128,21 @@ uLong test_deflate(compr)
     c_stream.next_in  = (Byte*)hello;
     c_stream.next_out = compr;
 
-    while (c_stream.total_in != len) {
+    while (c_stream.total_in != (uLong)len) {
 	c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
 	err = deflate(&c_stream, Z_NO_FLUSH);
 	CHECK_ERR(err, "deflate");
     }
     /* Finish the stream, still forcing small buffers: */
-    do {
+    for (;;) {
 	c_stream.avail_out = 1;
 	err = deflate(&c_stream, Z_FINISH);
+	if (err == Z_STREAM_END) break;
 	CHECK_ERR(err, "deflate");
-    } while (c_stream.avail_out == 0);
+    }
 
     err = deflateEnd(&c_stream);
     CHECK_ERR(err, "deflateEnd");
-
-    return c_stream.total_out;
 }
 
 /* ===========================================================================
@@ -142,7 +155,7 @@ void test_inflate(compr)
     int err;
     z_stream d_stream; /* decompression stream */
 
-    strcpy(uncompr, "garbage");
+    strcpy((char*)uncompr, "garbage");
 
     d_stream.zalloc = (alloc_func)0;
     d_stream.zfree = (free_func)0;
@@ -163,13 +176,88 @@ void test_inflate(compr)
     err = inflateEnd(&d_stream);
     CHECK_ERR(err, "inflateEnd");
 
-    if (strcmp(uncompr, hello)) {
+    if (strcmp((char*)uncompr, hello)) {
 	fprintf(stderr, "bad inflate\n");
     } else {
 	printf("inflate(): %s\n", uncompr);
     }
 }
 
+/* ===========================================================================
+ * Test deflate() with full flush
+ */
+void test_flush(compr)
+    Byte compr[];
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+    int len = strlen(hello)+1;
+
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+
+    err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+
+    c_stream.next_in  = (Byte*)hello;
+    c_stream.next_out = compr;
+    c_stream.avail_in = 3;
+    c_stream.avail_out = BUFLEN;
+    err = deflate(&c_stream, Z_FULL_FLUSH);
+    CHECK_ERR(err, "deflate");
+
+    compr[3]++; /* force an error in first compressed block */
+    c_stream.avail_in = len - 3;
+
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+	CHECK_ERR(err, "deflate");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+
+/* ===========================================================================
+ * Test inflateSync()
+ */
+void test_sync(compr)
+    Byte compr[];
+{
+    local Byte uncompr[BUFLEN];
+    int err;
+    z_stream d_stream; /* decompression stream */
+
+    strcpy((char*)uncompr, "garbage");
+
+    d_stream.zalloc = (alloc_func)0;
+    d_stream.zfree = (free_func)0;
+
+    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 = sizeof(uncompr);
+
+    inflate(&d_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "inflate");
+
+    d_stream.avail_in = BUFLEN-2; /* let inflate read all compressed data */
+    err = inflateSync(&d_stream); /* skip the damaged part */
+    CHECK_ERR(err, "inflateSync");
+
+    err = inflate(&d_stream, Z_FINISH);
+    if (err != Z_DATA_ERROR) {
+        fprintf(stderr, "inflate should report DATA_ERROR\n");
+	/* Because of incorrect adler32 */
+    }
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+
+    printf("after inflateSync(): hel%s\n", uncompr);
+}
+
 /* ===========================================================================
  * Usage:  example [output.gz  [input.gz]]
  */
@@ -179,7 +267,6 @@ void main(argc, argv)
     char *argv[];
 {
     local Byte compr[BUFLEN];
-    uLong comprLen;
 
     if (zlib_version[0] != ZLIB_VERSION[0]) {
 	fprintf(stderr, "incompatible zlib version\n");
@@ -193,9 +280,11 @@ void main(argc, argv)
     test_gzio((argc > 1 ? argv[1] : "foo.gz"),
 	      (argc > 2 ? argv[2] : "foo.gz"));
 
-    comprLen = test_deflate(compr);
+    test_deflate(compr);
-
     test_inflate(compr);
 
+    test_flush(compr);
+    test_sync(compr);
+
     exit(0);
 }

gzio.c

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h
  */
 
-/* $Id: gzio.c,v 1.4 1995/04/14 14:50:52 jloup Exp $ */
+/* $Id: gzio.c,v 1.7 1995/05/02 12:22:08 jloup Exp $ */
 
 #include <stdio.h>
 
@@ -46,7 +46,12 @@ typedef struct gz_stream {
 } gz_stream;
 
 
-/* ===========================================================================
+local int    destroy __P((gz_stream *s));
+local gzFile gz_open __P((char *path, char *mode, int  fd));
+local void   putLong __P((FILE *file, uLong x));
+local uLong  getLong __P((Byte *buf));
+
+ /* ===========================================================================
  * Cleanup then free the given gz_stream. Return a zlib error code.
  */
 local int destroy (s)
@@ -71,8 +76,9 @@ local int destroy (s)
     if (s->file != NULL && fclose(s->file)) {
 	err = Z_ERRNO;
     }
+    if (s->z_err < 0) err = s->z_err;
     zcfree((voidp)0, s);
-    return s->z_err < 0 ? s->z_err : err;
+    return err;
 }
 
 /* ===========================================================================
@@ -122,7 +128,7 @@ local gzFile gz_open (path, mode, fd)
     
     if (s->mode == 'w') {
 	err = deflateInit2(&(s->stream), Z_DEFAULT_COMPRESSION,
-			   DEFLATED, -WBITS, MEM_LEVEL, 0);
+			   DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
 	/* windowBits is passed < 0 to suppress zlib header */
 
 	s->stream.next_out = s->outbuf = ALLOC(Z_BUFSIZE);
@@ -131,7 +137,7 @@ local gzFile gz_open (path, mode, fd)
 	    return destroy(s), (gzFile)Z_NULL;
 	}
     } else {
-	err = inflateInit2(&(s->stream), -WBITS);
+	err = inflateInit2(&(s->stream), -MAX_WBITS);
 	s->stream.next_in  = s->inbuf = ALLOC(Z_BUFSIZE);
 
 	if (err != Z_OK || s->inbuf == Z_NULL) {
@@ -215,7 +221,7 @@ gzFile gzdopen (fd, mode)
     char *mode;
 {
     char name[20];
-    sprintf(name, "_fd:%d_", fd); /* for debugging */
+    sprintf(name, "<fd:%d>", fd); /* for debugging */
 
     return gz_open (name, mode, fd);
 }
@@ -235,14 +241,15 @@ int gzread (file, buf, len)
 
     if (s->transparent) {
 	unsigned n = 0;
+	Byte *b = (Byte*)buf;
 	/* Copy the first two (non-magic) bytes if not done already */
 	while (s->stream.avail_in > 0 && len > 0) {
-	    *((Byte*)buf)++ = *s->stream.next_in++;
+	    *b++ = *s->stream.next_in++;
 	    s->stream.avail_in--;
 	    len--; n++;
 	}
 	if (len == 0) return n;
-	return n + fread(buf, 1, len, s->file);
+	return n + fread(b, 1, len, s->file);
     }
     if (s->z_err == Z_DATA_ERROR) return -1; /* bad .gz file */
     if (s->z_err == Z_STREAM_END) return 0;  /* don't read crc as data */
@@ -337,7 +344,7 @@ int gzflush (file, flush)
 	if (len != 0) {
 	    if (fwrite(s->outbuf, 1, len, s->file) != len) {
 		s->z_err = Z_ERRNO;
-		break;
+		return Z_ERRNO;
 	    }
 	    s->stream.next_out = s->outbuf;
 	    s->stream.avail_out = Z_BUFSIZE;
@@ -345,14 +352,14 @@ int gzflush (file, flush)
 	if (done) break;
 	s->z_err = deflate(&(s->stream), flush);
 
-	if (s->z_err != Z_OK) break;
-
         /* deflate has finished flushing only when it hasn't used up
          * all the available space in the output buffer: 
          */
-	done = (s->stream.avail_out != 0);
+        done = (s->stream.avail_out != 0 || s->z_err == Z_STREAM_END);
+ 
+	if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
-    return s->z_err;
+    return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }
 
 /* ===========================================================================
@@ -364,7 +371,7 @@ local void putLong (file, x)
 {
     int n;
     for (n = 0; n < 4; n++) {
-	fputc(x & 0xff, file);
+	fputc((int)(x & 0xff), file);
 	x >>= 8;
     }
 }
@@ -393,12 +400,15 @@ int gzclose (file)
     gzFile file;
 {
     uInt n;
+    int err;
     gz_stream *s = (gz_stream*)file;
 
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
-	gzflush (file, Z_FINISH);
+	err = gzflush (file, Z_FINISH);
+	if (err != Z_OK) return destroy(file);
+
 	putLong (s->file, s->crc);
 	putLong (s->file, s->stream.total_in);
 

infblock.c

@@ -60,25 +60,48 @@ local uInt border[] = {	/* Order of the bit length code lengths */
       the two sets of lengths.
  */
 
-struct inflate_blocks_state *inflate_blocks_new(z,wsize)
+
+void inflate_blocks_reset(s, z, c)
+struct inflate_blocks_state *s;
 z_stream *z;
-uInt wsize;
+uLong *c;
+{
+  if (s->checkfn != Z_NULL)
+    *c = s->check;
+  if (s->mode == BTREE || s->mode == DTREE)
+    ZFREE(z, s->sub.trees.blens);
+  if (s->mode == CODES)
+    inflate_codes_free(s->sub.codes, z);
+  s->mode = TYPE;
+  s->bitk = 0;
+  s->bitb = 0;
+  s->read = s->write = s->window;
+  if (s->checkfn != Z_NULL)
+    s->check = (*s->checkfn)(0L, Z_NULL, 0);
+  Trace((stderr, "inflate:   blocks reset\n"));
+}
+
+
+struct inflate_blocks_state *inflate_blocks_new(z, c, w)
+z_stream *z;
+check_func c;
+uInt w;
 {
   struct inflate_blocks_state *s;
 
   if ((s = (struct inflate_blocks_state *)ZALLOC
        (z,1,sizeof(struct inflate_blocks_state))) == Z_NULL)
     return s;
-  if ((s->window = (Byte *)ZALLOC(z,1,wsize)) == Z_NULL)
+  if ((s->window = (Byte *)ZALLOC(z, 1, w)) == Z_NULL)
   {
     ZFREE(z, s);
     return Z_NULL;
   }
+  s->end = s->window + w;
+  s->checkfn = c;
   s->mode = TYPE;
-  s->bitk = 0;
+  Trace((stderr, "inflate:   blocks allocated\n"));
-  s->read = s->write = s->window;
+  inflate_blocks_reset(s, z, &s->check);
-  s->end = s->window + wsize;
-  s->check = 1;
   return s;
 }
 
@@ -109,12 +132,16 @@ int r;
       switch (t >> 1)
       {
         case 0:				/* stored */
+	  Trace((stderr, "inflate:     stored block%s\n",
+		 s->last ? " (last)" : ""));
 	  DUMPBITS(3)
 	  t = k & 7;			/* go to byte boundary */
 	  DUMPBITS(t)
 	  s->mode = LENS;		/* get length of stored block */
 	  break;
 	case 1:				/* fixed */
+	  Trace((stderr, "inflate:     fixed codes block%s\n",
+		 s->last ? " (last)" : ""));
 	  {
 	    uInt bl, bd;
 	    inflate_huft *tl, *td;
@@ -131,12 +158,14 @@ int r;
 	  s->mode = CODES;
 	  break;
 	case 2:				/* dynamic */
+	  Trace((stderr, "inflate:     dynamic codes block%s\n",
+		 s->last ? " (last)" : ""));
 	  DUMPBITS(3)
 	  s->mode = TABLE;
 	  break;
 	case 3:				/* illegal */
 	  DUMPBITS(3)
-	  s->mode = ERROR;
+	  s->mode = BAD;
 	  z->msg = "invalid block type";
 	  r = Z_DATA_ERROR;
 	  LEAVE
@@ -146,13 +175,14 @@ int r;
       NEEDBITS(32)
       if ((~b) >> 16 != (b & 0xffff))
       {
-        s->mode = ERROR;
+        s->mode = BAD;
 	z->msg = "invalid stored block lengths";
 	r = Z_DATA_ERROR;
 	LEAVE
       }
       k = 0;				/* dump bits */
       s->sub.left = (uInt)b & 0xffff;
+      Tracev((stderr, "inflate:       stored length %u\n", s->sub.left));
       s->mode = s->sub.left ? STORED : TYPE;
       break;
     case STORED:
@@ -161,6 +191,9 @@ int r;
 	NEEDOUT
 	OUTBYTE(NEXTBYTE)
       } while (--s->sub.left);
+      Tracev((stderr, "inflate:       stored end, %lu total out\n",
+	      z->total_out + (q >= s->read ? q - s->read :
+	      (s->end - s->read) + (q - s->window))));
       s->mode = s->last ? DRY : TYPE;
       break;
     case TABLE:
@@ -169,7 +202,7 @@ int r;
 #ifndef PKZIP_BUG_WORKAROUND
       if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
       {
-        s->mode = ERROR;
+        s->mode = BAD;
         z->msg = "too many length or distance symbols";
 	r = Z_DATA_ERROR;
 	LEAVE
@@ -185,6 +218,7 @@ int r;
       }
       DUMPBITS(14)
       s->sub.trees.index = 0;
+      Tracev((stderr, "inflate:       table sizes ok\n"));
       s->mode = BTREE;
     case BTREE:
       while (s->sub.trees.index < 4 + (s->sub.trees.table >> 10))
@@ -202,10 +236,11 @@ int r;
       {
         r = t;
 	if (r == Z_DATA_ERROR)
-	  s->mode = ERROR;
+	  s->mode = BAD;
 	LEAVE
       }
       s->sub.trees.index = 0;
+      Tracev((stderr, "inflate:       bits tree ok\n"));
       s->mode = DTREE;
     case DTREE:
       while (t = s->sub.trees.table,
@@ -237,7 +272,7 @@ int r;
 	  if (i + j > 258 + (t & 0x1f) + ((t >> 5) & 0x1f) ||
 	      (c == 16 && i < 1))
 	  {
-	    s->mode = ERROR;
+	    s->mode = BAD;
 	    z->msg = "invalid bit length repeat";
 	    r = Z_DATA_ERROR;
 	    LEAVE
@@ -264,10 +299,11 @@ int r;
 	if (t != Z_OK)
 	{
 	  if (t == (uInt)Z_DATA_ERROR)
-	    s->mode = ERROR;
+	    s->mode = BAD;
 	  r = t;
 	  LEAVE
 	}
+        Tracev((stderr, "inflate:       trees ok\n"));
 	if ((c = inflate_codes_new(bl, bd, tl, td, z)) == Z_NULL)
 	{
 	  inflate_trees_free(td, z);
@@ -286,8 +322,22 @@ int r;
       r = Z_OK;
       inflate_codes_free(s->sub.codes, z);
       LOAD
-      s->mode = s->last ? DRY : TYPE;
+      Tracev((stderr, "inflate:       codes end, %lu total out\n",
+	      z->total_out + (q >= s->read ? q - s->read :
+	      (s->end - s->read) + (q - s->window))));
+      if (!s->last)
+      {
+        s->mode = TYPE;
 	break;
+      }
+      if (k > 7)              /* return unused byte, if any */
+      {
+        Assert(k < 16, "inflate_codes grabbed too many bytes")
+        k -= 8;
+	n++;
+	p--;                    /* can always return one */
+      }
+      s->mode = DRY;
     case DRY:
       FLUSH
       if (s->read != s->write)
@@ -296,7 +346,7 @@ int r;
     case DONE:
       r = Z_STREAM_END;
       LEAVE
-    case ERROR:
+    case BAD:
       r = Z_DATA_ERROR;
       LEAVE
     default:
@@ -306,19 +356,14 @@ int r;
 }
 
 
-int inflate_blocks_free(s, z, c, e)
+int inflate_blocks_free(s, z, c)
 struct inflate_blocks_state *s;
 z_stream *z;
 uLong *c;
-int *e;
 {
-  *e = s->bitk > 7 ? (s->bitb >> (s->bitk & 7)) & 0xff : -1;
+  inflate_blocks_reset(s, z, c);
-  *c = s->check;
-  if (s->mode == BTREE || s->mode == DTREE)
-    ZFREE(z, s->sub.trees.blens);
-  if (s->mode == CODES)
-    inflate_codes_free(s->sub.codes, z);
   ZFREE(z, s->window);
   ZFREE(z, s);
+  Trace((stderr, "inflate:   blocks freed\n"));
   return Z_OK;
 }

infblock.h

@@ -12,6 +12,7 @@ struct inflate_blocks_state;
 
 extern struct inflate_blocks_state * inflate_blocks_new __P((
     z_stream *,
+    check_func,                 /* check function */
     uInt));                     /* window size */
 
 extern int inflate_blocks __P((
@@ -19,8 +20,12 @@ extern int inflate_blocks __P((
     z_stream *,
     int));			/* initial return code */
 
+extern void inflate_blocks_reset __P((
+    struct inflate_blocks_state *,
+    z_stream *,
+    uLong *));                  /* check value on output */
+
 extern int inflate_blocks_free __P((
     struct inflate_blocks_state *,
     z_stream *,
-    uLong *,			/* check value on output */
+    uLong *));                  /* check value on output */
-    int *));			/* possible leftover byte to return */

infcodes.c

@@ -6,6 +6,7 @@
 #include "zutil.h"
 #include "inftrees.h"
 #include "infutil.h"
+#include "inffast.h"
 #include "infcodes.h"
 
 /* simplify the use of the inflate_huft type with some defines */
@@ -28,7 +29,7 @@ struct inflate_codes_state {
       LIT,	/* o: got literal, waiting for output space */
       WASH,	/* o: got eob, possibly still output waiting */
       END,	/* x: got eob and all data flushed */
-      BAD}	/* x: got error */
+      BADCODE}	/* x: got error */
     mode;		/* current inflate_codes mode */
 
   /* mode dependent information */
@@ -69,6 +70,7 @@ z_stream *z;
     c->dbits = (Byte)bd;
     c->ltree = tl;
     c->dtree = td;
+    Tracev((stderr, "inflate:       codes new\n"));
   }
   return c;
 }
@@ -98,7 +100,19 @@ int r;
   while (1) switch (c->mode)
   {		/* waiting for "i:"=input, "o:"=output, "x:"=nothing */
     case START:		/* x: set up for LEN */
-      /* %%% check for avail in and out to do fast loop %%% */
+#ifndef SLOW
+      if (m >= 258 && n >= 10)
+      {
+        UPDATE
+	r = inflate_fast(c->lbits, c->dbits, c->ltree, c->dtree, s, z);
+	LOAD
+	if (r != Z_OK)
+	{
+	  c->mode = r == Z_STREAM_END ? WASH : BADCODE;
+	  break;
+	}
+      }
+#endif /* !SLOW */
       c->sub.code.need = c->lbits;
       c->sub.code.tree = c->ltree;
       c->mode = LEN;
@@ -111,15 +125,16 @@ int r;
       {
         if (e == -128)		/* invalid code */
 	{
-	  c->mode = BAD;
+	  c->mode = BADCODE;
-	  z->msg = "invalid huffman code";
+	  z->msg = "invalid literal/length code";
 	  r = Z_DATA_ERROR;
 	  LEAVE
 	}
 	e = -e;
 	if (e & 64)		/* end of block */
 	{
-	  c->mode = END;
+	  Tracevv((stderr, "inflate:         end of block\n"));
+	  c->mode = WASH;
 	  break;
 	}
 	c->sub.code.need = e;
@@ -129,6 +144,9 @@ int r;
       if (e & 16)		/* literal */
       {
 	c->sub.lit = t->base;
+	Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
+		 "inflate:         literal '%c'\n" :
+		 "inflate:         literal 0x%02x\n", t->base));
 	c->mode = LIT;
 	break;
       }
@@ -142,6 +160,7 @@ int r;
       DUMPBITS(j)
       c->sub.code.need = c->dbits;
       c->sub.code.tree = c->dtree;
+      Tracevv((stderr, "inflate:         length %u\n", c->len));
       c->mode = DIST;
     case DIST:		/* i: get distance next */
       j = c->sub.code.need;
@@ -152,8 +171,8 @@ int r;
       {
         if (e == -128)
 	{
-	  c->mode = BAD;
+	  c->mode = BADCODE;
-	  z->msg = "invalid huffman code";
+	  z->msg = "invalid distance code";
 	  r = Z_DATA_ERROR;
 	  LEAVE
 	}
@@ -169,9 +188,10 @@ int r;
       NEEDBITS(j)
       c->sub.copy.dist += (uInt)b & inflate_mask[j];
       DUMPBITS(j)
+      Tracevv((stderr, "inflate:         distance %u\n", c->sub.copy.dist));
       c->mode = COPY;
     case COPY:		/* o: copying bytes in window, waiting for space */
-      f = q - s->window < c->sub.copy.dist ?
+      f = (uInt)(q - s->window) < c->sub.copy.dist ?
 	  s->end - (c->sub.copy.dist - (q - s->window)) :
 	  q - c->sub.copy.dist;
       while (c->len)
@@ -197,7 +217,7 @@ int r;
     case END:
       r = Z_STREAM_END;
       LEAVE
-    case BAD:		/* x: got error */
+    case BADCODE:	/* x: got error */
       r = Z_DATA_ERROR;
       LEAVE
     default:
@@ -214,4 +234,5 @@ z_stream *z;
   inflate_trees_free(c->dtree, z);
   inflate_trees_free(c->ltree, z);
   ZFREE(z, c);
+  Tracev((stderr, "inflate:       codes free\n"));
 }

inffast.c

@@ -0,0 +1,156 @@
+/* inffast.c -- process literals and length/distance pairs fast
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+#include "zutil.h"
+#include "inftrees.h"
+#include "infutil.h"
+#include "inffast.h"
+
+struct inflate_codes_state {int dummy;}; /* for buggy compilers */
+
+/* simplify the use of the inflate_huft type with some defines */
+#define base more.Base
+#define next more.Next
+#define exop word.what.Exop
+#define bits word.what.Bits
+
+/* macros for bit input with no checking and for returning unused bytes */
+#ifdef DEBUG
+#  undef NEXTBYTE
+#  define NEXTBYTE (n--?0:fprintf(stderr,"inffast underrun\n"),*p++)
+#endif
+#define GRABBITS(j) {while(k<(j)){b|=((uLong)NEXTBYTE)<<k;k+=8;}}
+#define UNGRAB {n+=(c=k>>3);p-=c;k&=7;}
+
+/* Called with number of bytes left to write in window at least 258
+   (the maximum string length) and number of input bytes available
+   at least ten.  The ten bytes are six bytes for the longest length/
+   distance pair plus four bytes for overloading the bit buffer. */
+
+int inflate_fast(bl, bd, tl, td, s, z)
+uInt bl, bd;
+inflate_huft *tl, *td;
+struct inflate_blocks_state *s;
+z_stream *z;
+{
+  inflate_huft *t;	/* temporary pointer */
+  int e;		/* extra bits or operation */
+  uLong b;		/* bit buffer */
+  uInt k;		/* bits in bit buffer */
+  Byte *p;		/* input data pointer */
+  uInt n;		/* bytes available there */
+  Byte *q;		/* output window write pointer */
+  uInt m;		/* bytes to end of window or read pointer */
+  uInt ml;		/* mask for literal/length tree */
+  uInt md;		/* mask for distance tree */
+  uInt c;		/* bytes to copy */
+  uInt d;		/* distance back to copy from */
+  Byte *r;		/* copy source pointer */
+
+  /* load input, output, bit values */
+  LOAD
+
+  /* initialize masks in registers */
+  ml = inflate_mask[bl];
+  md = inflate_mask[bd];
+
+  /* do until not enough input or output space for fast loop */
+  do {				/* assume called with m >= 258 && n >= 10 */
+    /* get literal/length code */
+    GRABBITS(20)		/* max bits for literal/length code */
+    if ((e = (t = tl + ((uInt)b & ml))->exop) < 0)
+      do {
+	if (e == -128)
+	{
+	  z->msg = "invalid literal/length code";
+          UNGRAB
+	  UPDATE
+	  return Z_DATA_ERROR;
+	}
+	DUMPBITS(t->bits)
+	e = -e;
+	if (e & 64)		/* end of block */
+	{
+	  Tracevv((stderr, "inflate:         * end of block\n"));
+          UNGRAB
+	  UPDATE
+	  return Z_STREAM_END;
+	}
+      } while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
+    DUMPBITS(t->bits)
+
+    /* process literal or length (end of block already trapped) */
+    if (e & 16)			/* then it's a literal */
+    {
+      Tracevv((stderr, t->base >= 0x20 && t->base < 0x7f ?
+		"inflate:         * literal '%c'\n" :
+		"inflate:         * literal 0x%02x\n", t->base));
+      *q++ = (Byte)t->base;
+      m--;
+    }
+    else			/* it's a length */
+    {
+      /* get length of block to copy (already have extra bits) */
+      c = t->base + ((uInt)b & inflate_mask[e]);
+      DUMPBITS(e);
+      Tracevv((stderr, "inflate:         * length %u\n", c));
+
+      /* decode distance base of block to copy */
+      GRABBITS(15);		/* max bits for distance code */
+      if ((e = (t = td + ((uInt)b & md))->exop) < 0)
+	do {
+	  if (e == -128)
+	  {
+	    z->msg = "invalid distance code";
+	    UNGRAB
+	    UPDATE
+	    return Z_DATA_ERROR;
+	  }
+	  DUMPBITS(t->bits)
+	  e = -e;
+	} while ((e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop) < 0);
+      DUMPBITS(t->bits)
+
+      /* get extra bits to add to distance base */
+      GRABBITS((uInt)e)		/* get extra bits (up to 13) */
+      d = t->base + ((uInt)b & inflate_mask[e]);
+      DUMPBITS(e)
+      Tracevv((stderr, "inflate:         * distance %u\n", d));
+
+      /* do the copy */
+      m -= c;
+      if ((uInt)(q - s->window) >= d)	/* if offset before destination, */
+      {					/*  just copy */
+	r = q - d;
+	*q++ = *r++;  c--;		/* minimum count is three, */
+	*q++ = *r++;  c--;		/*  so unroll loop a little */
+	do {
+	  *q++ = *r++;
+	} while (--c);
+      }
+      else				/* else offset after destination */
+      {
+	e = d - (q - s->window);	/* bytes from offset to end */
+	r = s->end - e;			/* pointer to offset */
+	if (c > (uInt)e)		/* if source crosses, */
+	{
+	  c -= e;			/* copy to end of window */
+	  do {
+	    *q++ = *r++;
+	  } while (--e);
+	  r = s->window;		/* copy rest from start of window */
+	}
+	do {				/* copy all or what's left */
+	  *q++ = *r++;
+	} while (--c);
+      }
+    }
+  } while (m >= 258 && n >= 10);
+
+  /* not enough input or output--restore pointers and return */
+  UNGRAB
+  UPDATE
+  return Z_OK;
+}

inffast.h

@@ -0,0 +1,17 @@
+/* inffast.h -- header to use inffast.c
+ * Copyright (C) 1995 Mark Adler
+ * For conditions of distribution and use, see copyright notice in zlib.h 
+ */
+
+/* WARNING: this file should *not* be used by applications. It is
+   part of the implementation of the compression library and is
+   subject to change. Applications should only use zlib.h.
+ */
+
+extern int inflate_fast __P((
+    uInt,
+    uInt,
+    inflate_huft *,
+    inflate_huft *,
+    struct inflate_blocks_state *,
+    z_stream *));

inflate.c

@@ -15,168 +15,47 @@ struct internal_state {
   enum {
       METHOD,	/* waiting for method byte */
       FLAG,	/* waiting for flag byte */
-      START,	/* make new blocks state */
       BLOCKS,	/* decompressing blocks */
       CHECK4,	/* four check bytes to go */
       CHECK3,	/* three check bytes to go */
       CHECK2,	/* two check bytes to go */
       CHECK1,	/* one check byte to go */
       DONE,	/* finished check, done */
-      ERROR}	/* got an error--stay here */
+      BAD}	/* got an error--stay here */
     mode;		/* current inflate mode */
 
-  int  no_header;
-  uInt w_size;  /* LZ77 window size (32K by default) */
-  uInt w_bits;  /* log2(w_size)  (8..16) */
-
   /* mode dependent information */
   union {
     uInt method;	/* if FLAGS, method byte */
-    struct inflate_blocks_state
-      *blocks;		/* if BLOCKS, current state */
     struct {
       uLong was;                /* computed check value */
       uLong need;               /* stream check value */
     } check;            /* if CHECK, check values to compare */
+    uInt marker;	/* if BAD, inflateSync's marker bytes count */
   } sub;	/* submode */
+
+  /* mode independent information */
+  int  nowrap;		/* flag for no wrapper */
+  uInt wbits;  		/* log2(window size)  (8..15, defaults to 15) */
+  struct inflate_blocks_state
+    *blocks;		/* current inflate_blocks state */
+
 };
 
 
-int inflateInit (strm)
+int inflateReset(z)
-z_stream *strm;
-{
-    return inflateInit2(strm, WBITS);
-}
-
-int inflateInit2(z, windowBits)
 z_stream *z;
-int windowBits;
 {
-  if (z == Z_NULL)
-    return Z_STREAM_ERROR;
-  if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
-  if (z->zfree == Z_NULL) z->zfree = zcfree;
-  z->total_in = z->total_out = 0;
-  z->msg = Z_NULL;
-  if ((z->state = (struct internal_state *)
-       ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
-    return Z_MEM_ERROR;
-  z->state->mode = METHOD;
-
-  z->state->no_header = 0;
-  if (windowBits < 0) { /* undocumented feature: no zlib header */
-    windowBits = - windowBits;
-    z->state->no_header = 1;
-    z->state->sub.method = DEFLATED;
-    z->state->mode = START;
-  }
-  if (windowBits < 8 || windowBits > 15) {
-    inflateEnd(z);
-    return Z_STREAM_ERROR;
-  }
-  z->state->w_bits = windowBits;
-  z->state->w_size = 1<<windowBits;
-  return Z_OK;
-}
-
-
-#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
-
-int inflate(z, f)
-z_stream *z;
-int f;
-{
-  int r;
-  uInt b;
   uLong c;
 
-  if (z == Z_NULL || z->next_in == Z_NULL)
+  if (z == Z_NULL || z->state == Z_NULL)
     return Z_STREAM_ERROR;
-  r = Z_BUF_ERROR;
+  z->total_in = z->total_out = 0;
-  while (1) switch (z->state->mode)
+  z->msg = Z_NULL;
-  {
+  z->state->mode = z->state->nowrap ? BLOCKS : METHOD;
-    case METHOD:
+  inflate_blocks_reset(z->state->blocks, z, &c);
-      if (z->avail_in == 0) return r;  r = Z_OK;
+  Trace((stderr, "inflate: reset\n"));
-      if (((z->state->sub.method = NEXTBYTE) & 0xf != DEFLATED))
+  return Z_OK;
-      {
-        z->state->mode = ERROR;
-	z->msg = "unknown compression method";
-	return Z_DATA_ERROR;
-      }
-      if ((z->state->sub.method >> 4) > z->state->w_bits)
-      {
-        z->state->mode = ERROR;
-	z->msg = "invalid window size";
-	return Z_DATA_ERROR;
-      }
-      z->state->mode = FLAG;
-    case FLAG:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      if ((b = NEXTBYTE) & 0x20)
-      {
-        z->state->mode = ERROR;
-	z->msg = "invalid reserved bit";
-	return Z_DATA_ERROR;
-      }
-      if (((z->state->sub.method << 8) + b) % 31)
-      {
-        z->state->mode = ERROR;
-	z->msg = "incorrect header check";
-	return Z_DATA_ERROR;
-      }
-      z->state->mode = START;
-    case START:
-      if ((z->state->sub.blocks = inflate_blocks_new(z,z->state->w_size))
-	  == Z_NULL)
-        return Z_MEM_ERROR;
-      z->state->mode = BLOCKS;
-    case BLOCKS:
-      if ((r = inflate_blocks(z->state->sub.blocks, z, r)) != Z_STREAM_END)
-        return r;
-      inflate_blocks_free(z->state->sub.blocks, z, &c, &r);
-      if (z->state->no_header) {
-	z->state->mode = DONE;
-	return Z_STREAM_END;
-      }
-      z->state->sub.check.was = c;
-      if (r != -1)
-      {
-	z->state->sub.check.need = (uLong)r << 24;
-        z->state->mode = CHECK3;
-        r = Z_OK;
-	break;
-      }
-      r = Z_OK;
-      z->state->mode = CHECK4;
-    case CHECK4:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
-      z->state->mode = CHECK3;
-    case CHECK3:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
-      z->state->mode = CHECK2;
-    case CHECK2:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
-      z->state->mode = CHECK1;
-    case CHECK1:
-      if (z->avail_in == 0) return r;  r = Z_OK;
-      z->state->sub.check.need += (uLong)NEXTBYTE;
-      if (z->state->sub.check.was != z->state->sub.check.need)
-      {
-        z->state->mode = ERROR;
-        z->msg = "incorrect data check";
-	return Z_DATA_ERROR;
-      }
-      z->state->mode = DONE;
-    case DONE:
-      return Z_STREAM_END;
-    case ERROR:
-      return Z_DATA_ERROR;
-    default:
-      return Z_STREAM_ERROR;
-  }
 }
 
 
@@ -184,38 +63,219 @@ int inflateEnd(z)
 z_stream *z;
 {
   uLong c;
-  int e;
 
   if (z == Z_NULL || z->state == Z_NULL || z->zfree == Z_NULL)
     return Z_STREAM_ERROR;
-  if (z->state->mode == BLOCKS)
+  if (z->state->blocks != Z_NULL)
-    inflate_blocks_free(z->state->sub.blocks, z, &c, &e);
+    inflate_blocks_free(z->state->blocks, z, &c);
   ZFREE(z, z->state);
   z->state = Z_NULL;
+  Trace((stderr, "inflate: end\n"));
   return Z_OK;
 }
 
 
-/* inflateSync not implemented yet--this just consumes input */
+int inflateInit2(z, w)
+z_stream *z;
+int w;
+{
+  /* initialize state */
+  if (z == Z_NULL)
+    return Z_STREAM_ERROR;
+  if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
+  if (z->zfree == Z_NULL) z->zfree = zcfree;
+  if ((z->state = (struct internal_state *)
+       ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
+    return Z_MEM_ERROR;
+  z->state->blocks = Z_NULL;
+
+  /* handle undocumented nowrap option (no zlib header or check) */
+  z->state->nowrap = 0;
+  if (w < 0)
+  {
+    w = - w;
+    z->state->nowrap = 1;
+  }
+
+  /* set window size */
+  if (w < 8 || w > 15)
+  {
+    inflateEnd(z);
+    return Z_STREAM_ERROR;
+  }
+  z->state->wbits = (uInt)w;
+
+  /* create inflate_blocks state */
+  if ((z->state->blocks =
+       inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, 1 << w))
+      == Z_NULL)
+  {
+    inflateEnd(z);
+    return Z_MEM_ERROR;
+  }
+  Trace((stderr, "inflate: allocated\n"));
+
+  /* reset state */
+  inflateReset(z);
+  return Z_OK;
+}
+
+
+int inflateInit(z)
+z_stream *z;
+{
+  return inflateInit2(z, DEF_WBITS);
+}
+
+
+#define NEEDBYTE {if(z->avail_in==0)return r;r=Z_OK;}
+#define NEXTBYTE (z->avail_in--,z->total_in++,*z->next_in++)
+
+int inflate(z, f)
+z_stream *z;
+int f;
+{
+  int r = f;	/* to avoid warning about unused f */
+  uInt b;
+
+  if (z == Z_NULL || z->next_in == Z_NULL)
+    return Z_STREAM_ERROR;
+  r = Z_BUF_ERROR;
+  while (1) switch (z->state->mode)
+  {
+    case METHOD:
+      NEEDBYTE
+      if (((z->state->sub.method = NEXTBYTE) & 0xf) != DEFLATED)
+      {
+        z->state->mode = BAD;
+	z->msg = "unknown compression method";
+	z->state->sub.marker = 5;	/* can't try inflateSync */
+	break;
+      }
+      if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
+      {
+        z->state->mode = BAD;
+	z->msg = "invalid window size";
+	z->state->sub.marker = 5;	/* can't try inflateSync */
+	break;
+      }
+      z->state->mode = FLAG;
+    case FLAG:
+      NEEDBYTE
+      if ((b = NEXTBYTE) & 0x20)
+      {
+        z->state->mode = BAD;
+	z->msg = "invalid reserved bit";
+	z->state->sub.marker = 5;	/* can't try inflateSync */
+	break;
+      }
+      if (((z->state->sub.method << 8) + b) % 31)
+      {
+        z->state->mode = BAD;
+	z->msg = "incorrect header check";
+	z->state->sub.marker = 5;	/* can't try inflateSync */
+	break;
+      }
+      Trace((stderr, "inflate: zlib header ok\n"));
+      z->state->mode = BLOCKS;
+    case BLOCKS:
+      r = inflate_blocks(z->state->blocks, z, r);
+      if (r == Z_DATA_ERROR)
+      {
+        z->state->mode = BAD;
+	z->state->sub.marker = 0;	/* can try inflateSync */
+	break;
+      }
+      if (r != Z_STREAM_END)
+	return r;
+      r = Z_OK;
+      inflate_blocks_reset(z->state->blocks, z, &z->state->sub.check.was);
+      if (z->state->nowrap)
+      {
+	z->state->mode = DONE;
+	break;
+      }
+      z->state->mode = CHECK4;
+    case CHECK4:
+      NEEDBYTE
+      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
+      z->state->mode = CHECK3;
+    case CHECK3:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
+      z->state->mode = CHECK2;
+    case CHECK2:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
+      z->state->mode = CHECK1;
+    case CHECK1:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE;
+
+      if (z->state->sub.check.was != z->state->sub.check.need)
+      {
+        z->state->mode = BAD;
+        z->msg = "incorrect data check";
+	z->state->sub.marker = 5;	/* can't try inflateSync */
+	break;
+      }
+      Trace((stderr, "inflate: zlib check ok\n"));
+      z->state->mode = DONE;
+    case DONE:
+      return Z_STREAM_END;
+    case BAD:
+      return Z_DATA_ERROR;
+    default:
+      return Z_STREAM_ERROR;
+  }
+}
+
+
 int inflateSync(z)
 z_stream *z;
 {
-  if (z == Z_NULL) return Z_STREAM_ERROR;
+  uInt n;	/* number of bytes to look at */
-  if (z->avail_in == 0) return Z_BUF_ERROR;
+  Byte *p;	/* pointer to bytes */
-  do {
+  uInt m;	/* number of marker bytes found in a row */
-    z->total_in++;
+  uLong r, w;	/* temporaries to save total_in and total_out */
-  } while (--z->avail_in);
+
+  /* set up */
+  if (z == Z_NULL || z->state == Z_NULL)
+    return Z_STREAM_ERROR;
+  if (z->state->mode != BAD)
+  {
+    z->state->mode = BAD;
+    z->state->sub.marker = 0;
+  }
+  if ((n = z->avail_in) == 0)
+    return Z_BUF_ERROR;
+  p = z->next_in;
+  m = z->state->sub.marker;
+
+  /* search */
+  while (n && m < 4)
+  {
+    if (*p == (Byte)(m < 2 ? 0 : 0xff))
+      m++;
+    else if (*p)
+      m = 0;
+    else
+      m = 4 - m;
+    p++, n--;
+  }
+
+  /* restore */
+  z->total_in += p - z->next_in;
+  z->next_in = p;
+  z->avail_in = n;
+  z->state->sub.marker = m;
+
+  /* return no joy or set up to restart on a new block */
+  if (m != 4)
     return Z_DATA_ERROR;
-}
+  r = z->total_in;  w = z->total_out;
-
+  inflateReset(z);
-
+  z->total_in = r;  z->total_out = w;
-/* inflateReset not fully implemented yet--this frees and reallocates */
+  z->state->mode = BLOCKS;
-int inflateReset(z)
+  return Z_OK;
-z_stream *z;
-{
-  int r;
-
-  if ((r = inflateEnd(z)) != Z_OK)
-    return r;
-  return inflateInit(z);
 }

inflate.h

@@ -1,22 +0,0 @@
-/* temporary kludge assuming single pass decompression */
-
-/* $Id: inflate.h,v 1.2 1995/04/11 14:47:32 jloup Exp $ */
-
-#include <stdio.h>
-
-#define NEXTBYTE \
-   (istrm->total_in++, istrm->avail_in-- == 0 ? \
-      (z_error("too small"), 0) : *istrm->next_in++)
-
-#define FLUSH(n) { \
-   if (istrm->avail_out < n) z_error("too big"); \
-   istrm->avail_out -= n; \
-   memcpy(istrm->next_out, slide, n); \
-   istrm->next_out += n; \
-   istrm->total_out += n; \
-}
-#define WSIZE istrm->state->w_size
-#define slide istrm->state->window
-#define memzero(a,s) memset((a),0,(s))
-#define inflate z_inflate
-#define qflag 1

inftest.c

@@ -2,6 +2,8 @@
 #include <stdlib.h>
 #include "zutil.h"
 
+void main __P((void));
+
 /* This test is in honor of Ed Hamrick who suggested that the interface
    to inflate be a byte at a time--this implements that, and is, of course,
    monumentally slow.  It has the virtue though of stressing the push-pull
@@ -61,7 +63,7 @@ void main()
       break;
   }
   inflateEnd(&z);
-  fprintf(stderr, "%d bytes in, %d bytes out\n", z.total_in, z.total_out);
+  fprintf(stderr, "%ld bytes in, %ld bytes out\n", z.total_in, z.total_out);
   if (z.msg != NULL)
     fprintf(stderr, "msg is <%s>\n", z.msg);
 }

inftrees.c

@@ -246,7 +246,7 @@ z_stream *zs;		/* for zalloc function */
         {
           x[h] = i;             /* save pattern for backing up */
           r.bits = (char)l;     /* bits to dump before this table */
-          r.exop = (char)(-j);  /* bits in this table */
+          r.exop = -(char)j;    /* bits in this table */
           r.next = q;           /* pointer to this table */
           j = i >> (w - l);     /* (get around Turbo C bug) */
           u[h-1][j] = r;        /* connect to last table */
@@ -383,6 +383,7 @@ uInt s;		/* size of item */
 {
   Assert(s == sizeof(inflate_huft) && n <= fixed_left,
          "inflate_trees falloc overflow");
+  if (q) s++; /* to make some compilers happy */
   fixed_left -= n;
   return (voidp)(fixed_mem + fixed_left);
 }
@@ -393,6 +394,7 @@ voidp q;
 voidp p;
 {
   Assert(0, "inflate_trees ffree called!");
+  if (q) q = p; /* to make some compilers happy */
 }
 
 

infutil.c

@@ -31,7 +31,7 @@ int r;
   q = s->read;
 
   /* compute number of bytes to copy as far as end of window */
-  n = (q <= s->write ? s->write : s->end) - q;
+  n = (uInt)((q <= s->write ? s->write : s->end) - q);
   if (n > z->avail_out) n = z->avail_out;
   if (n && r == Z_BUF_ERROR) r = Z_OK;
 
@@ -40,19 +40,24 @@ int r;
   z->total_out += n;
 
   /* update check information */
-  s->check = adler32(s->check, q, n);
+  if (s->checkfn != Z_NULL)
+    s->check = (*s->checkfn)(s->check, q, n);
 
   /* copy as far as end of window */
-  while (n--) *p++ = *q++;
+  zmemcpy(p, q, n);
+  p += n;
+  q += n;
 
   /* see if more to copy at beginning of window */
   if (q == s->end)
   {
-    /* wrap source pointer */
+    /* wrap pointers */
     q = s->window;
+    if (s->write == s->end)
+      s->write = s->window;
 
     /* compute bytes to copy */
-    n = s->write - q;
+    n = (uInt)(s->write - q);
     if (n > z->avail_out) n = z->avail_out;
     if (n && r == Z_BUF_ERROR) r = Z_OK;
 
@@ -61,10 +66,13 @@ int r;
     z->total_out += n;
 
     /* update check information */
-    s->check = adler32(s->check, q, n);
+    if (s->checkfn != Z_NULL)
+      s->check = (*s->checkfn)(s->check, q, n);
 
     /* copy */
-    while (n--) *p++ = *q++;
+    zmemcpy(p, q, n);
+    p += n;
+    q += n;
   }
 
   /* update pointers */

infutil.h

@@ -22,7 +22,7 @@ struct inflate_blocks_state {
       CODES,	/* processing fixed or dynamic block */
       DRY,	/* output remaining window bytes */
       DONE,	/* finished last block, done */
-      ERROR}	/* got a data error--stuck here */
+      BAD}	/* got a data error--stuck here */
     mode;		/* current inflate_block mode */
 
   /* mode dependent information */
@@ -47,6 +47,7 @@ struct inflate_blocks_state {
   Byte *end;		/* one byte after sliding window */
   Byte *read;		/* window read pointer */
   Byte *write;		/* window write pointer */
+  check_func checkfn;   /* check function */
   uLong check;		/* check on output */
 
 };

minigzip.c

@@ -13,13 +13,23 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.1 1995/04/14 13:35:59 jloup Exp $ */
+/* $Id: minigzip.c,v 1.4 1995/05/02 15:54:22 jloup Exp $ */
 
 #include <stdio.h>
 #include "zlib.h"
 
+#ifndef __GO32__
+extern void exit  __P((int));
+#endif
+extern int unlink __P((const char *));
+
+#ifdef STDC
+#  include <string.h>
+#endif
+
 #ifdef MSDOS
 #  include <fcntl.h>
+#  include <io.h>
 #  define SET_BINARY_MODE(file) setmode(fileno(file), O_BINARY)
 #else
 #  define SET_BINARY_MODE(file)
@@ -36,6 +46,13 @@
 
 char *prog;
 
+void error           __P((char *msg));
+void gz_compress     __P((FILE   *in, gzFile out));
+void gz_uncompress   __P((gzFile in, FILE   *out));
+void file_compress   __P((char  *file));
+void file_uncompress __P((char  *file));
+void main            __P((int argc, char *argv[]));
+
 /* ===========================================================================
  * Display error message and exit
  */
@@ -87,7 +104,7 @@ void gz_uncompress(in, out)
 	if (len < 0) error (gzerror(in, &err));
 	if (len == 0) break;
 
-	if (fwrite(buf, 1, len, out) != len) error("failed fwrite");
+	if (fwrite(buf, 1, len, out) != (uInt)len) error("failed fwrite");
     }
     if (fclose(out)) error("failed fclose");
 

trees.c

@@ -29,7 +29,7 @@
  *          Addison-Wesley, 1983. ISBN 0-201-06672-6.
  */
 
-/* $Id: trees.c,v 1.2 1995/04/10 16:21:44 jloup Exp $ */
+/* $Id: trees.c,v 1.4 1995/05/01 16:53:44 jloup Exp $ */
 
 #include "deflate.h"
 
@@ -722,6 +722,22 @@ local void send_all_trees(s, lcodes, dcodes, blcodes)
     Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
 }
 
+/* ===========================================================================
+ * Send a stored block
+ */
+void ct_stored_block(s, buf, stored_len, eof)
+    deflate_state *s;
+    char *buf;        /* input block */
+    ulg stored_len;   /* length of input block */
+    int eof;          /* true if this is the last block for a file */
+{
+    send_bits(s, (STORED_BLOCK<<1)+eof, 3);  /* send block type */
+    s->compressed_len = (s->compressed_len + 3 + 7) & ~7L;
+    s->compressed_len += (stored_len + 4) << 3;
+
+    copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
+}
+
 /* ===========================================================================
  * Determine the best encoding for the current block: dynamic trees, static
  * trees or store, and output the encoded block to the zip file. This function
@@ -771,8 +787,8 @@ ulg ct_flush_block(s, buf, stored_len, eof)
      * the whole file is transformed into a stored file:
      */
 #ifdef STORED_FILE_OK
-#  ifdef FORCE_METHOD
+#  ifdef FORCE_STORED_FILE
-    if (level == 1 && eof && compressed_len == 0L) { /* force stored file */
+    if (eof && compressed_len == 0L) { /* force stored file */
 #  else
     if (stored_len <= opt_lenb && eof && s->compressed_len==0L && seekable()) {
 #  endif
@@ -785,8 +801,8 @@ ulg ct_flush_block(s, buf, stored_len, eof)
     } else
 #endif /* STORED_FILE_OK */
 
-#ifdef FORCE_METHOD
+#ifdef FORCE_STORED
-    if (level == 2 && buf != (char*)0) { /* force stored block */
+    if (buf != (char*)0) { /* force stored block */
 #else
     if (stored_len+4 <= opt_lenb && buf != (char*)0) {
                        /* 4: two words for the lengths */
@@ -797,14 +813,10 @@ ulg ct_flush_block(s, buf, stored_len, eof)
          * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
          * transform a block into a stored block.
          */
-        send_bits(s, (STORED_BLOCK<<1)+eof, 3);  /* send block type */
+	ct_stored_block(s, buf, stored_len, eof);
-        s->compressed_len = (s->compressed_len + 3 + 7) & ~7L;
-        s->compressed_len += (stored_len + 4) << 3;
 
-        copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
+#ifdef FORCE_STATIC
-
+    } else if (static_lenb >= 0) { /* force static trees */
-#ifdef FORCE_METHOD
-    } else if (level == 3) { /* force static trees */
 #else
     } else if (static_lenb == opt_lenb) {
 #endif
@@ -944,7 +956,7 @@ local void set_data_type(s)
     while (n < 7)        bin_freq += s->dyn_ltree[n++].Freq;
     while (n < 128)    ascii_freq += s->dyn_ltree[n++].Freq;
     while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
-    s->data_type = bin_freq > (ascii_freq >> 2) ? BINARY : ASCII;
+    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
 }
 
 /* ===========================================================================
@@ -1011,7 +1023,7 @@ local void bi_windup(s)
     if (s->bi_valid > 8) {
         put_short(s, s->bi_buf);
     } else if (s->bi_valid > 0) {
-        put_byte(s, s->bi_buf);
+        put_byte(s, (Byte)s->bi_buf);
     }
     s->bi_buf = 0;
     s->bi_valid = 0;

zconf.h

@@ -3,7 +3,7 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zconf.h,v 1.7 1995/04/12 20:42:28 jloup Exp $ */
+/* $Id: zconf.h,v 1.11 1995/05/02 13:07:21 jloup Exp $ */
 
 #ifndef _ZCONF_H
 #define _ZCONF_H
@@ -28,17 +28,41 @@
 #if defined(MSDOS) && !defined(__32BIT__)
 #  define MAXSEG_64K
 #endif
-
+#if !defined(STDC) && (defined(MSDOS) || defined(__STDC__))
-#ifdef MAXSEG_64K
+#  define STDC
-#  define MAX_MEM_LEVEL 8
-#else
-#  define MAX_MEM_LEVEL 9
 #endif
 
+/* Maximum value for memLevel in deflateInit2 */
+#ifndef MAX_MEM_LEVEL
+#  ifdef MAXSEG_64K
+#    define MAX_MEM_LEVEL 8
+#  else
+#    define MAX_MEM_LEVEL 9
+#  endif
+#endif
+
+/* Maximum value for windowBits in deflateInit2 and inflateInit2 */
+#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)
+ 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
+     make CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
+ Of course this will generally degrade compression (there's no free lunch).
+
+   The memory requirements for inflate are (in bytes) 1 << windowBits
+ that is, 32K for windowBits=15 (default value) plus a few kilobytes
+ for small objects.
+*/
+
 			/* Type declarations */
 
 #ifndef __P /* function prototypes */
-#  if defined(__STDC__) || defined(MSDOS)
+#  ifdef STDC
 #    define __P(args)  args
 #  else
 #    define __P(args)  ()
@@ -49,13 +73,13 @@
   typedef unsigned char  Byte;  /* 8 bits */
 #endif
 #ifndef uInt
-  typedef unsigned int   uInt;  /* may be 16 or 32 bits */
+  typedef unsigned int   uInt;  /* 16 bits or more */
 #endif
 #ifndef uLong
   typedef unsigned long  uLong; /* 32 bits or more */
 #endif
 #ifndef voidp
-#  if defined(__STDC__) || defined(MSDOS)
+#  ifdef STDC
      typedef void *voidp;
 #  else
      typedef Byte *voidp;

zlib.h

@@ -1,5 +1,5 @@
 /* zlib.h -- interface of the 'zlib' general purpose compression library
-  version 0.7  April 14th, 1995.
+  version 0.91 May 2nd, 1995.
 
   Copyright (C) 1995 Jean-loup Gailly and Mark Adler
 
@@ -28,7 +28,7 @@
 
 #include "zconf.h"
 
-#define ZLIB_VERSION "0.7"
+#define ZLIB_VERSION "0.91"
 
 /* 
      The 'zlib' compression library provides in-memory compression and
@@ -81,15 +81,20 @@ typedef struct z_stream_s {
    opaque before calling the init function. All other fields are set by the
    compression library and must not be updated by the application.
 
-   The opaque value provided by the application will be passed as first
+   The opaque value provided by the application will be passed as the first
    parameter for calls of zalloc and zfree. This can be useful for custom
    memory management. The compression library attaches no meaning to the
    opaque value.
 
    zalloc must return Z_NULL if there is not enough memory for the object.
    On 16-bit systems, the functions zalloc and zfree must be able to allocate
-   exactly 65536 bytes, but will not be require to allocate more than this
+   exactly 65536 bytes, but will not be required to allocate more than this
-   if the symbol MAXSEG_64K is defined (see zconf.h).
+   if the symbol MAXSEG_64K is defined (see zconf.h). WARNING: On MSDOS,
+   pointers returned by zalloc for objects of exactly 65536 bytes *must*
+   have their offset normalized to zero. The default allocation function
+   provided by this library ensures this (see zutil.c). To reduce memory
+   requirements and avoid any allocation of 64K objects, at the expense of
+   compression ratio, compile the library with -DMAX_WBITS=14 (see zconf.h).
 
    The fields total_in and total_out can be used for statistics or
    progress reports. After compression, total_in holds the total size of
@@ -152,10 +157,10 @@ extern int deflateInit __P((z_stream *strm, int level));
    to level 6).
 
      deflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the stream state was inconsistent (such
+   enough memory, Z_STREAM_ERROR if level is not a valid compression level.
-   as zalloc being NULL). msg is set to null if there is no error message.
+   msg is set to null if there is no error message.  deflateInit does not
-   deflateInit does not perform any compression: this will be done by
+   perform any compression: this will be done by deflate().
-   deflate().  */
+*/
 
 
 extern int deflate __P((z_stream *strm, int flush));
@@ -164,8 +169,8 @@ extern int deflate __P((z_stream *strm, int flush));
 
   - 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
-    enough room in the output buffer), next_in is updated and processing
+    enough room in the output buffer), next_in and avail_in are updated and
-    will resume at this point for the next call of deflate().
+    processing will resume at this point for the next call of deflate().
 
   - Provide more output starting at next_out and update next_out and avail_out
     accordingly. This action is forced if the parameter flush is non zero.
@@ -175,40 +180,45 @@ extern int deflate __P((z_stream *strm, int flush));
 
   Before the call of deflate(), the application should ensure that at least
   one of the actions is possible, by providing more input and/or consuming
-  more output, and updating avail_in or avail_out accordingly.
+  more output, and updating avail_in or avail_out accordingly; avail_out
-  The application can consume the compressed output when the output
+  should never be zero before the call. The application can consume the
-  buffer is full (avail_out == 0), or after each call of deflate().
+  compressed output when it wants, for example when the output buffer is full
+  (avail_out == 0), or after each call of deflate().
 
     If the parameter flush is set to Z_PARTIAL_FLUSH, the current compression
-  block is byte aligned and flushed to the output buffer so that the
+  block is terminated and flushed to the output buffer so that the
-  decompressor can get all input data available so far; if the compression
+  decompressor can get all input data available so far. For method 9, a future
-  method is 8 (deflate without partial flush capability), the current block
+  variant on method 8, the current block will be flushed but not terminated.
-  is terminated. If flush is set to Z_FULL_FLUSH, the compression block is
+  If flush is set to Z_FULL_FLUSH, the compression block is terminated, a
-  terminated, a special marker is output and the compression dictionary is
+  special marker is output and the compression dictionary is discarded; this
-  discarded; this is useful to allow the decompressor to synchronize if one
+  is useful to allow the decompressor to synchronize if one compressed block
-  compressed block has been damaged.
+  has been damaged (see inflateSync below).  Flushing degrades compression and
-    Flushing degrades compression and so should be used only when necessary.
+  so should be used only when necessary.  Using Z_FULL_FLUSH too often can
-  Using Z_FULL_FLUSH too often can seriously degrade the compression.
+  seriously degrade the compression.
 
-    If the parameter flush is set to Z_FINISH, all pending input is
+    If the parameter flush is set to Z_FINISH, all pending input is processed,
-  processed and all pending output is flushed. The next operation on this
+  all pending output is flushed and deflate returns with Z_STREAM_END if there
-  stream must be another call of deflate with Z_FINISH but no more input data
+  was enough output space; if deflate returns with Z_OK, this function must be
-  (unchanged avail_in) if this call returned with avail_out equal to zero,
+  called again with Z_FINISH and more output space (updated avail_out) but no
-  or a call of deflateEnd to deallocate the compression state. Z_FINISH can
+  more input data, until it returns with Z_STREAM_END or an error. After
-  be used immediately after deflateInit if all the compression is to be
+  deflate has returned Z_STREAM_END, the only possible operations on the
-  done in a single step. In this case, avail_out must be at least 0.1%
+  stream are deflateReset or deflateEnd.
-  larger than avail_in plus 8 bytes.
   
-    deflate() may update strm->data_type if it can make a good guess about
+    Z_FINISH can be used immediately after deflateInit if all the compression
+  is to be done in a single step. In this case, avail_out must be at least
+  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() 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
   the compression algorithm in any manner.
 
-    deflate() return Z_OK if some progress has been made (more input processed
+    deflate() returns Z_OK if some progress has been made (more input
-  or more output produced), Z_STREAM_ERROR if the stream state was
+  processed or more output produced), Z_STREAM_END if all input has been
-  inconsistent (for example if next_in or next_out was NULL), Z_BUF_ERROR if
+  consumed and all output has been produced (only when flush is set to
-  no progress is possible or if there was not enough room in the output buffer
+  Z_FINISH), Z_STREAM_ERROR if the stream state was inconsistent (for example
-  when Z_FINISH is used.
+  if next_in or next_out was NULL), Z_BUF_ERROR if no progress is possible.
 */
 
 
@@ -232,8 +242,7 @@ extern int inflateInit __P((z_stream *strm));
    functions.
 
      inflateInit returns Z_OK if success, Z_MEM_ERROR if there was not
-   enough memory, Z_STREAM_ERROR if the stream state was inconsistent (such
+   enough memory.  msg is set to null if there is no error message.
-   as zalloc being NULL). msg is set to null if there is no error message.
    inflateInit does not perform any decompression: this will be done by
    inflate().
 */
@@ -255,12 +264,13 @@ extern int inflate __P((z_stream *strm, int flush));
   Before the call of inflate(), the application should ensure that at least
   one of the actions is possible, by providing more input and/or consuming
   more output, and updating the next_* and avail_* values accordingly.
-  The application can consume the uncompressed output when the output
+  The application can consume the uncompressed output when it wants, for
-  buffer is full (avail_out == 0), or after each call of inflate().
+  example when the output buffer is full (avail_out == 0), or after each
+  call of inflate().
 
     If the parameter flush is set to Z_PARTIAL_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 paramater other than Z_PARTIAL_FLUSH
+  not specified for values of the flush parameter other than Z_PARTIAL_FLUSH
   and Z_FINISH, but the current implementation actually flushes as much output
   as possible anyway.
 
@@ -275,13 +285,13 @@ extern int inflate __P((z_stream *strm, int flush));
 
     inflate() returns Z_OK if some progress has been made (more input
   processed or more output produced), Z_STREAM_END if the end of the
-  compressed data has been reached, Z_DATA_ERROR if the input data was
+  compressed data has been reached and all uncompressed output has been
-  corrupted, Z_STREAM_ERROR if the stream structure was inconsistent (for
+  produced, Z_DATA_ERROR if the input data was corrupted, Z_STREAM_ERROR if
-  example if next_in or next_out was NULL), Z_MEM_ERROR if there was not enough
+  the stream structure was inconsistent (for example if next_in or next_out
-  memory, Z_BUF_ERROR if no progress is possible or if there was not enough
+  was NULL), Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if no
-  room in the output buffer when Z_FINISH is used. In the Z_DATA_ERROR case,
+  progress is possible or if there was not enough room in the output buffer
-  the application may then call inflateSync to look for a good compression
+  when Z_FINISH is used. In the Z_DATA_ERROR case, the application may then
-  block.
+  call inflateSync to look for a good compression block.
 */
 
 
@@ -318,14 +328,15 @@ extern int deflateInit2 __P((z_stream *strm,
 
      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 soon). Larger values
+   version of the library (the value 16 will be allowed for method 9). Larger
-   of this parameter result in better compression at the expense of memory
+   values of this parameter result in better compression at the expense of
-   usage. The default value is 15 if deflateInit is used instead.
+   memory usage. The default value is 15 if 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
    is slow and reduces compression ratio; memLevel=9 uses maximum memory
-   for optimal speed. The default value is 8.
+   for optimal speed. The default value is 8. See zconf.h for total memory
+   usage as a function of windowBits and memLevel.
 
      The strategy parameter is used to tune the compression algorithm. Use
    the value Z_DEFAULT_STRATEGY for normal data, Z_FILTERED for data
@@ -338,8 +349,8 @@ extern int deflateInit2 __P((z_stream *strm,
 
      If next_in is not null, the library will use this buffer to hold also
    some history information; the buffer must either hold the entire input
-   data, or have at least (1<<windowBits) bytes and be writable. If next_in is
+   data, or have at least 1<<(windowBits+1) bytes and be writable. If next_in
-   null, the library will allocate its own history buffer (and leave next_in
+   is null, the library will allocate its own history buffer (and leave next_in
    null). next_out need not be provided here but must be provided by the
    application for the next call of deflate().
 
@@ -350,8 +361,7 @@ extern int deflateInit2 __P((z_stream *strm,
    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 the stream state was inconsistent
+   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
-   (such as zalloc being NULL) or the parameters are 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().
@@ -363,7 +373,7 @@ extern int deflateCopy __P((z_stream *dest,
      Sets the destination stream as a complete copy of the source stream.  If
    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 responsability of the
+   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.
 
@@ -406,7 +416,7 @@ extern int inflateInit2 __P((z_stream *strm,
 
      If next_out is not null, the library will use this buffer for the history
    buffer; the buffer must either be large enough to hold the entire output
-   data, or have at least 1<<(windowBits-1) bytes.  If next_out is null, the
+   data, or have at least 1<<windowBits bytes.  If next_out is null, the
    library will allocate its own buffer (and leave next_out null). next_in
    need not be provided here but must be provided by the application for the
    next call of inflate().
@@ -418,21 +428,21 @@ extern int inflateInit2 __P((z_stream *strm,
    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 the stream state was inconsistent
+   not enough memory, Z_STREAM_ERROR if a parameter is invalid (such as
-   (such as zalloc being NULL) or the parameters are invalid (such as
+   windowBits < 8). msg is set to null if there is no error message.
-   windowBits < 9). msg is set to null if there is no error message.
    inflateInit2 does not perform any compression: this will be done by
    inflate().
 */
 
 extern int inflateSync __P((z_stream *strm));
 /* 
-    Skips invalid compressed data until the special marker and a valid block
+    Skips invalid compressed data until the special marker (see deflate()
-  can be found, or until all available input is skipped. No output is provided.
+  above) can be found, or until all available input is skipped. No output
+  is provided.
 
-    inflateSync returns Z_OK if a valid block has been found, Z_BUF_ERROR if
+    inflateSync returns Z_OK if the special marker has been found, Z_BUF_ERROR
-  no more input was provided, Z_DATA_ERROR if not valid block has been found,
+  if no more input was provided, Z_DATA_ERROR if no marker has been found,
-  Z_STREAM_ERROR if the stream structure was inconsistent. In the success
+  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
   application may repeatedly call inflateSync, providing more input each time,
@@ -466,7 +476,7 @@ extern int compress __P((Byte *dest,   uLong *destLen,
      Compresses the source buffer into the destination buffer.  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 8 bytes. Upon exit, destLen is the actual size of the
+   sourceLen plus 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.
@@ -502,7 +512,7 @@ extern gzFile gzopen  __P((char *path, char *mode));
    is as in fopen ("rb" or "wb"). gzopen can also 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 return NULL if the file could not be opened or if there was
+     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).
@@ -513,7 +523,7 @@ extern gzFile gzdopen  __P((int fd, char *mode));
      gzdopen() associates a gzFile with the file descriptor fd.  File
    descriptors are obtained from calls like open, dup, creat, or pipe.
    The mode parameter is as in fopen ("rb" or "wb").
-     gzdopen return NULL if there was insufficient memory to allocate
+     gzdopen returns NULL if there was insufficient memory to allocate
    the (de)compression state.
 */
 
@@ -536,7 +546,8 @@ extern int    gzflush __P((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
-   error number (see function gzerror below).
+   error number (see function gzerror below). gzflush returns Z_OK if
+   the flush parameter is Z_FINISH and all output could be flushed.
      gzflush should be called only when strictly necessary because it can
    degrade compression.
 */
@@ -570,7 +581,7 @@ extern uLong adler32 __P((uLong adler, Byte *buf, uInt len));
      Update a running Adler-32 checksum with the bytes buf[0..len-1] and
    return the updated checksum. If buf is NULL, this function returns
    the required initial value for the checksum.
-   An Adler-32 cheksum is almost as reliable as a CRC32 but can be computed
+   An Adler-32 checksum is almost as reliable as a CRC32 but can be computed
    much faster. Usage example:
 
      uLong adler = adler32(0L, Z_NULL, 0);
@@ -585,7 +596,7 @@ extern uLong crc32   __P((uLong crc, Byte *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
-   for the crc (0). Pre- and post-conditioning (one's complement) is performed
+   for the crc. Pre- and post-conditioning (one's complement) is performed
    within this function so it shouldn't be done by the application.
    Usage example:
 

zutil.c

@@ -3,12 +3,16 @@
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: zutil.c,v 1.3 1995/04/10 09:52:26 jloup Exp $ */
+/* $Id: zutil.c,v 1.7 1995/05/02 15:54:47 jloup Exp $ */
 
 #include <stdio.h>
 
 #include "zutil.h"
 
+#ifndef __GO32__
+extern void exit __P((int));
+#endif
+
 char *zlib_version = ZLIB_VERSION;
 
 char *z_errmsg[] = {
@@ -53,8 +57,9 @@ void zmemzero(dest, len)
 }
 #endif
 
-#if defined(MSDOS) && !defined(USE_CALLOC)
+#if defined(__TURBOC__) && !defined(__SMALL__)
-#  ifdef __TURBOC__
+
+#  define MY_ZCALLOC
 
 /* Turbo C malloc() does not allow dynamic allocation of 64K bytes
  * and farmalloc(64K) returns a pointer with an offset of 8, so we
@@ -82,7 +87,7 @@ local ptr_table table[MAX_PTR];
 
 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
 {
-    voidp buf;
+    voidp buf = opaque; /* just to make some compilers happy */
     ulg bsize = (ulg)items*size;
 
     if (bsize < 65536L) {
@@ -119,10 +124,14 @@ void  zcfree (voidp opaque, voidp ptr)
 	next_ptr--;
 	return;
     }
+    ptr = opaque; /* just to make some compilers happy */
     z_error("zcfree: ptr not found");
 }
+#endif /* __TURBOC__ */
 
-#  else /* MSC */
+#if defined(M_I86CM) || defined(M_I86LM) /* MSC compact or large model */
+
+#  define MY_ZCALLOC
 
 #if (!defined(_MSC_VER) || (_MSC_VER < 600))
 #  define _halloc  halloc
@@ -131,20 +140,25 @@ void  zcfree (voidp opaque, voidp ptr)
 
 voidp zcalloc (voidp opaque, unsigned items, unsigned size)
 {
+    if (opaque) opaque = 0; /* to make compiler happy */
     return _halloc((long)items, size);
 }
 
 void  zcfree (voidp opaque, voidp ptr)
 {
-    return _hfree(ptr);
+    if (opaque) opaque = 0; /* to make compiler happy */
+    _hfree(ptr);
 }
 
-#  endif /* __TURBOC__ ? */
+#endif /* defined(M_I86CM) || defined(M_I86LM) */
 
-#else /* !MSDOS */
 
+#ifndef MY_ZCALLOC /* Any system without a special alloc function */
+
+#ifndef __GO32__
 extern voidp calloc __P((uInt items, uInt size));
 extern void  free   __P((voidp ptr));
+#endif
 
 voidp zcalloc (opaque, items, size)
     voidp opaque;
@@ -161,4 +175,4 @@ void  zcfree (opaque, ptr)
     free(ptr);
 }
 
-#endif /* MSDOS */
+#endif /* MY_ZCALLOC */

zutil.h

@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: zutil.h,v 1.4 1995/04/14 10:22:17 jloup Exp $ */
+/* $Id: zutil.h,v 1.8 1995/05/02 15:44:46 jloup Exp $ */
 
 #ifndef _Z_UTIL_H
 #define _Z_UTIL_H
@@ -17,9 +17,13 @@
 
 #ifdef MSDOS
 #   include <stddef.h>
+#   include <errno.h>
 #else
     extern int errno;
 #endif
+#ifdef STDC
+#  include <string.h>
+#endif
 
 #ifndef local
 #  define local static
@@ -39,13 +43,15 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 
 #define DEFLATED   8
 
-#ifndef WBITS
+#define DEF_WBITS 15
-# define WBITS   15 /* 32K window */
+/* default windowBits for decompression. MAX_WBITS is for compression only */
-#endif
 
-#ifndef MEM_LEVEL
+#if MAX_MEM_LEVEL >= 8
-# define MEM_LEVEL  8
+#  define DEF_MEM_LEVEL 8
+#else
+#  define DEF_MEM_LEVEL  MAX_MEM_LEVEL
 #endif
+/* default memLevel */
 
 #define STORED_BLOCK 0
 #define STATIC_TREES 1
@@ -62,7 +68,6 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define OS_CODE  0x00
 #  ifdef __TURBOC__
 #    include <alloc.h>
-#    define exit(n) _exit(n)
 #  else /* MSC */
 #    include <malloc.h>
 #  endif
@@ -121,7 +126,7 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define zstrerror(errnum) ""
 #endif
 
-#if defined(__STDC__) && !defined(HAVE_MEMCPY)
+#if defined(STDC) && !defined(HAVE_MEMCPY)
 #  define HAVE_MEMCPY
 #endif
 #ifdef HAVE_MEMCPY
@@ -154,13 +159,16 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #endif
 
 
+typedef uLong (*check_func) __P((uLong check, Byte *buf, uInt len));
+
 extern void z_error    __P((char *m));
 
 voidp zcalloc __P((voidp opaque, unsigned items, unsigned size));
 void  zcfree  __P((voidp opaque, voidp ptr));
 
-#define ZALLOC(strm, items, size) (*strm->zalloc)(strm->opaque, items, size)
+#define ZALLOC(strm, items, size) \
-#define ZFREE(strm, addr)         (*strm->zfree) (strm->opaque, (voidp)addr)
+           (*((strm)->zalloc))((strm)->opaque, (items), (size))
+#define ZFREE(strm, addr)  (*((strm)->zfree))((strm)->opaque, (voidp)(addr))
 #define TRY_FREE(s, p) {if (p) ZFREE(s, p);}
 
 #endif /* _Z_UTIL_H */