zlib 1.0.7

ChangeLog

 
 		ChangeLog file for zlib
 
+Changes in 1.0.7 (20 Jan 1998)
+- fix gzseek which was broken in write mode
+- return error for gzseek to negative absolute position
+- fix configure for Linux (Chun-Chung Chen)
+- increase stack space for MSC (Tim Wegner)
+- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
+- define EXPORTVA for gzprintf (Gilles Vollant)
+- added man page zlib.3 (Rick Rodgers)
+- for contrib/untgz, fix makedir() and improve Makefile
+
+- check gzseek in write mode in example.c
+- allocate extra buffer for seeks only if gzseek is actually called
+- avoid signed/unsigned comparisons (Tim Wegner, Gilles Vollant)
+- add inflateSyncPoint in zconf.h
+- fix list of exported functions in nt/zlib.dnt and mdsos/zlib.def
+
+Changes in 1.0.6 (19 Jan 1998)
+- add functions gzprintf, gzputc, gzgetc, gztell, gzeof, gzseek, gzrewind and
+  gzsetparams (thanks to Roland Giersig and Kevin Ruland for some of this code)
+- Fix a deflate bug occuring only with compression level 0 (thanks to
+  Andy Buckler for finding this one).
+- In minigzip, pass transparently also the first byte for .Z files.
+- return Z_BUF_ERROR instead of Z_OK if output buffer full in uncompress()
+- check Z_FINISH in inflate (thanks to Marc Schluper)
+- Implement deflateCopy (thanks to Adam Costello)
+- make static libraries by default in configure, add --shared option.
+- move MSDOS or Windows specific files to directory msdos
+- suppress the notion of partial flush to simplify the interface
+  (but the symbol Z_PARTIAL_FLUSH is kept for compatibility with 1.0.4)
+- suppress history buffer provided by application to simplify the interface
+  (this feature was not implemented anyway in 1.0.4)
+- next_in and avail_in must be initialized before calling inflateInit or
+  inflateInit2
+- add EXPORT in all exported functions (for Windows DLL)
+- added Makefile.nt (thanks to Stephen Williams)
+- added the unsupported "contrib" directory:
+   contrib/asm386/ by Gilles Vollant <info@winimage.com>
+	386 asm code replacing longest_match().
+   contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+   contrib/iostream2/  by Tyge Løvset <Tyge.Lovset@cmr.no>
+	Another C++ I/O streams interface
+   contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+	A very simple tar.gz file extractor using zlib
+   contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.
+- pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
+  level) in minigzip (thanks to Tom Lane)
+
+- use const for rommable constants in deflate
+- added test for gzseek and gztell in example.c
+- add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
+- add undocumented function zError to convert error code to string
+  (for Tim Smithers)
+- Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
+- Use default memcpy for Symantec MSDOS compiler.
+- Add EXPORT keyword for check_func (needed for Windows DLL)
+- add current directory to LD_LIBRARY_PATH for "make test"
+- create also a link for libz.so.1
+- added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
+- use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
+- added -soname for Linux in configure (Chun-Chung Chen,
+- assign numbers to the exported functions in zlib.def (for Windows DLL)
+- add advice in zlib.h for best usage of deflateSetDictionary
+- work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
+- allow compilation with ANSI keywords only enabled for TurboC in large model
+- avoid "versionString"[0] (Borland bug)
+- add NEED_DUMMY_RETURN for Borland
+- use variable z_verbose for tracing in debug mode (Peter Deutsch).
+- allow compilation with CC
+- defined STDC for OS/2 (David Charlap)	
+- limit external names to 8 chars for MVS (Thomas Lund)
+- in minigzip.c, use static buffers only for 16-bit systems
+- fix suffix check for "minigzip -d foo.gz"
+- do not return an error for the 2nd of two consecutive gzflush() (Felix Lee)
+- use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau)
+- added makelcc.bat for lcc-win32 (Tom St Denis)
+- in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe)
+- Avoid expanded $Id$. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion.
+- check for unistd.h in configure (for off_t)
+- use Tracev instead of Trace in infblock.c
+- remove useless check parameter in inflate_blocks_free
+- avoid useless assignment of s->check to itself in inflate_blocks_new
+- do not flush twice in gzclose (thanks to Ken Raeburn)
+- rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h
+- use NO_ERRNO_H instead of enumeration of operating systems with errno.h
+- work around buggy fclose on pipes for HP/UX
+- support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson)
+- fix configure if CC is already equal to gcc
+
 Changes in 1.0.5 (3 Jan 98)
 - Fix inflate to terminate gracefully when fed corrupted or invalid data
 - Use const for rommable constants in inflate
 - Eliminate memory leaks on error conditions in inflate
 - Removed some vestigial code in inflate
 - Update web address in README
-
+  
 Changes in 1.0.4 (24 Jul 96)
 - In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
   bit, so the decompressor could decompress all the correct data but went

INDEX

-ChangeLog	history of changes
-INDEX		this file
-Make_vms.com	script for Vax/VMS
-Makefile	makefile for Unix (generated by configure)
-Makefile.b32	makefile for Borland C++   32-bit
-Makefile.bor	makefile for Borland C/C++ 16-bit
-Makefile.dj2	makefile for DJGPP 2.x
-Makefile.in	makefile for Unix (template for configure)
-Makefile.msc	makefile for Microsoft C 16-bit
-Makefile.riscos makefile for RISCOS
-Makefile.sas	makefile for Amiga SAS/C
-Makefile.tc	makefile for Turbo C
-Makefile.wat	makefile for Watcom C
-README		guess what
-algorithm.doc	description of the compression & decompression algorithms
-configure	configure script for Unix
-descrip.mms	makefile for Vax/VMS
-zlib.def        definition file for Windows DLL
-zlib.rc         definition file for Windows DLL
+ChangeLog		history of changes
+INDEX			this file
+Make_vms.com		script for Vax/VMS
+Makefile		makefile for Unix (generated by configure)
+Makefile.in		makefile for Unix (template for configure)
+Makefile.msc		makefile for Microsoft C 16-bit
+Makefile.riscos 	makefile for RISCOS
+Makefile.sas		makefile for Amiga SAS/C
+README			guess what
+algorithm.txt		description of the (de)compression algorithm
+configure		configure script for Unix
+descrip.mms		makefile for Vax/VMS
+zlib.3			mini man page for zlib (volunteers to write full
+			man pages from zlib.h welcome. write to jloup@gzip.org)
+
+msdos/Makefile.b32	makefile for Borland C++   32-bit
+msdos/Makefile.bor	makefile for Borland C/C++ 16-bit
+msdos/Makefile.dj2	makefile for DJGPP 2.x
+msdos/Makefile.tc	makefile for Turbo C
+msdos/Makefile.wat	makefile for Watcom C
+msdos/zlib.def        	definition file for Windows DLL
+msdos/zlib.rc         	definition file for Windows DLL
+
+nt/Makefile.nt		makefile for Windows NT
+nt/zlib.dnt		definition file for Windows NT DLL
 
 
 		zlib public header files (must be kept):
@@ -49,3 +55,20 @@ zutil.h
 		source files for sample programs:
 example.c
 minigzip.c
+
+		unsupported contribution by third parties
+
+contrib/asm386/ by Gilles Vollant <info@winimage.com>
+	386 asm code replacing longest_match().
+
+contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
+        A C++ I/O streams interface to the zlib gz* functions
+
+contrib/iostream2/  by Tyge Lvset <Tyge.Lovset@cmr.no>
+	Another C++ I/O streams interface
+
+contrib/untgz/  by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
+	A very simple tar.gz extractor using zlib
+
+contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
+        How to use compress(), uncompress() and the gz* functions from VB.

Makefile

@@ -22,12 +22,14 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
 
-VER=1.0.5
+VER=1.0.7
 LIBS=libz.a
+SHAREDLIB=libz.so
 
 AR=ar rc
 RANLIB=ranlib
 TAR=tar
+SHELL=/bin/sh
 
 prefix=/usr/local
 exec_prefix = $(prefix)
@@ -37,22 +39,30 @@ OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
 
 TEST_OBJS = example.o minigzip.o
 
-DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] descrip.mms \
-	    zlib.def zlib.rc algorithm.doc  *.[ch]
+DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
+  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
+  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
+  contrib/asm386/*.asm contrib/asm386/*.c \
+  contrib/asm386/*.bat contrib/asm386/*.mak contrib/iostream/*.cpp \
+  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
+  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
 
 all: example minigzip
 
 test: all
-	./example
-	echo hello world | ./minigzip | ./minigzip -d 
+	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	./example ; \
+	echo hello world | ./minigzip | ./minigzip -d
 
 libz.a: $(OBJS)
 	$(AR) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) 2>/dev/null
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
-libz.so.$(VER): $(OBJS)
+$(SHAREDLIB).$(VER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f libz.so; ln -s $@ libz.so
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
 
 example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
@@ -68,22 +78,28 @@ install: $(LIBS)
 	cp $(LIBS) $(exec_prefix)/lib
 	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
 	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
-	cd $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
-	  ln -s libz.so.$(VER) libz.so; \
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
+	  rm -f $(SHAREDLIB) $(SHAREDLIB).1; \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).1; \
+	  (ldconfig || true)  >/dev/null 2>&1; \
 	fi
 # The ranlib in install is needed on NeXTSTEP which checks file times
+# ldconfig is for Linux
 
 uninstall:
 	cd $(exec_prefix)/lib; rm -f $(LIBS); \
-	if test -f libz.so; then \
+	if test -f $(SHAREDLIB); then \
 	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
-	 rm -f libz.so.$$v libz.so; \
+	 rm -f $(SHAREDLIB).$$v $(SHAREDLIB); \
 	fi
-	cd $(prefix)/include; rm -f zlib.h zconf.h
+	cdz $(prefix)/include; rm -f zlib.h zconf.h
 
 clean:
 	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
 
+distclean:	clean
+
 zip:
 	mv Makefile Makefile~; cp -p Makefile.in Makefile
 	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\

Makefile.in

@@ -22,12 +22,14 @@ CFLAGS=-O
 LDFLAGS=-L. -lz
 LDSHARED=$(CC)
 
-VER=1.0.5
+VER=1.0.7
 LIBS=libz.a
+SHAREDLIB=libz.so
 
 AR=ar rc
 RANLIB=ranlib
 TAR=tar
+SHELL=/bin/sh
 
 prefix=/usr/local
 exec_prefix = $(prefix)
@@ -37,22 +39,30 @@ OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
 
 TEST_OBJS = example.o minigzip.o
 
-DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] descrip.mms \
-	    zlib.def zlib.rc algorithm.doc  *.[ch]
+DISTFILES = README INDEX ChangeLog configure Make*[a-z0-9] *.[ch] descrip.mms \
+  algorithm.txt zlib.3 msdos/Make*[a-z0-9] msdos/zlib.def msdos/zlib.rc \
+  nt/Makefile.nt nt/zlib.dnt  contrib/README.contrib contrib/*.txt \
+  contrib/asm386/*.asm contrib/asm386/*.c \
+  contrib/asm386/*.bat contrib/asm386/*.mak contrib/iostream/*.cpp \
+  contrib/iostream/*.h  contrib/iostream2/*.h contrib/iostream2/*.cpp \
+  contrib/untgz/Makefile contrib/untgz/*.c contrib/untgz/*.w32
 
 all: example minigzip
 
 test: all
-	./example
-	echo hello world | ./minigzip | ./minigzip -d 
+	@LD_LIBRARY_PATH=.:$(LD_LIBRARY_PATH) ; export LD_LIBRARY_PATH; \
+	./example ; \
+	echo hello world | ./minigzip | ./minigzip -d
 
 libz.a: $(OBJS)
 	$(AR) $@ $(OBJS)
-	-@ ($(RANLIB) $@ || true) 2>/dev/null
+	-@ ($(RANLIB) $@ || true) >/dev/null 2>&1
 
-libz.so.$(VER): $(OBJS)
+$(SHAREDLIB).$(VER): $(OBJS)
 	$(LDSHARED) -o $@ $(OBJS)
-	rm -f libz.so; ln -s $@ libz.so
+	rm -f $(SHAREDLIB) $(SHAREDLIB).1
+	ln -s $@ $(SHAREDLIB)
+	ln -s $@ $(SHAREDLIB).1
 
 example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
@@ -68,22 +78,28 @@ install: $(LIBS)
 	cp $(LIBS) $(exec_prefix)/lib
 	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
 	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
-	cd $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
-	  ln -s libz.so.$(VER) libz.so; \
+	cd $(exec_prefix)/lib; if test -f $(SHAREDLIB).$(VER); then \
+	  rm -f $(SHAREDLIB) $(SHAREDLIB).1; \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB); \
+	  ln -s $(SHAREDLIB).$(VER) $(SHAREDLIB).1; \
+	  (ldconfig || true)  >/dev/null 2>&1; \
 	fi
 # The ranlib in install is needed on NeXTSTEP which checks file times
+# ldconfig is for Linux
 
 uninstall:
 	cd $(exec_prefix)/lib; rm -f $(LIBS); \
-	if test -f libz.so; then \
+	if test -f $(SHAREDLIB); then \
 	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
-	 rm -f libz.so.$$v libz.so; \
+	 rm -f $(SHAREDLIB).$$v $(SHAREDLIB); \
 	fi
-	cd $(prefix)/include; rm -f zlib.h zconf.h
+	cdz $(prefix)/include; rm -f zlib.h zconf.h
 
 clean:
 	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
 
+distclean:	clean
+
 zip:
 	mv Makefile Makefile~; cp -p Makefile.in Makefile
 	v=`sed -n -e 's/\.//g' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\

README

-zlib 1.0.5 is a general purpose data compression library.  All the code
+zlib 1.0.7 is a general purpose data compression library.  All the code
 is reentrant (thread safe).  The data format used by the zlib library
 is described by RFCs (Request for Comments) 1950 to 1952 in the files 
 ftp://ds.internic.net/rfc/rfc1950.txt (zlib format), rfc1951.txt (deflate
@@ -19,27 +19,54 @@ makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
 Questions about zlib should be sent to <zlib@quest.jpl.nasa.gov> or,
 if this fails, to the addresses given below in the Copyright section.
 The zlib home page is http://www.cdrom.com/pub/infozip/zlib/
-
-The changes made in version 1.0.5 are documented in the file ChangeLog.
-The main changes since 1.0.4 are:
-
-- Fix inflate to terminate gracefully when fed corrupted or invalid data
-- Use const for rommable constants in inflate
-
+The official zlib ftp site is ftp://ftp.cdrom.com/pub/infozip/zlib/
+Mark Nelson wrote an article about zlib for the Jan. 1997 issue of 
+Dr. Dobb's Journal; a copy of the article is available in
+http://web2.airmail.net/markn/articles/zlibtool/zlibtool.htm
+
+The changes made in version 1.0.7 are documented in the file ChangeLog.
+The main changes since 1.0.6 are:
+
+- fix gzseek which was broken in write mode
+- return error for gzseek to negative absolute position
+- fix configure for Linux (Chun-Chung Chen)
+- increase stack space for MSC (Tim Wegner)
+- get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
+- define EXPORTVA for gzprintf (Gilles Vollant)
+- added mini man page zlib.3 (Rick Rodgers) [volunteers to write full
+  man pages from zlib.h most welcome. write to jloup@gzip.org]
+- for contrib/untgz, fix makedir() and improve Makefile
+
+Unsupported third party contributions are provided in directory "contrib".
+
+A Java implementation of zlib is available in the Java Development Kit 1.1
+http://www.javasoft.com/products/JDK/1.1/docs/api/Package-java.util.zip.html
+See the zlib home page http://www.cdrom.com/pub/infozip/zlib/ for details.
 
 A Perl interface to zlib written by Paul Marquess <pmarquess@bfsec.bt.co.uk>
 is in the CPAN (Comprehensive Perl Archive Network) sites, such as:
 ftp://ftp.cis.ufl.edu/pub/perl/CPAN/modules/by-module/Compress/Compress-Zlib*
 
+A Python interface to zlib written by A.M. Kuchling <amk@magnet.com>
+is available from the Python Software Association sites, such as:
+ftp://ftp.python.org/pub/python/contrib/Encoding/zlib*.tar.gz
 
 Notes for some targets:
 
-- For Turbo C the small model is supported only with reduced performance to
-  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
+  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
+  The zlib DLL support was initially done by Alessandro Iacopetti and is
+  now maintained by Gilles Vollant <info@winimage.com>. Check the zlib DLL
+  home page at http://www.winimage.com/zLibDll
 
-- For 64-bit Iris, deflate.c must be compiled without any optimization.
+  From Visual Basic, you can call the DLL functions which do not take
+  a structure as argument: compress, uncompress and all gz* functions.
+  See contrib/visual-basic.txt for more information.
+  I don't know how to handle structures in Visual Basic, sorry.
+
+- For 64-bit Irix, deflate.c must be compiled without any optimization.
   With -O, one libpng test fails. The test works in 32 bit mode (with
-  the -32 compiler flag). The compiler bug has been reported to SGI.
+  the -n32 compiler flag). The compiler bug has been reported to SGI.
 
 - zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1   
   it works when compiled with cc.
@@ -47,14 +74,11 @@ Notes for some targets:
 - zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not
   accepting the -O option). It works with the other cc compiler.
 
-- To build a Windows DLL version, include in a DLL project zlib.def, zlib.rc
-  and all .c files except example.c and minigzip.c; compile with -DZLIB_DLL
-  For help on building a zlib DLL, contact Alessandro Iacopetti
-  <iaco@email.alessandria.alpcom.it>  http://lisa.unial.it/iaco ,
-  or contact Brad Clarke <bclarke@cyberus.ca>.
-
 - gzdopen is not supported on RISCOS
 
+- For Turbo C the small model is supported only with reduced performance to
+  avoid any far allocation; it was tested with -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+
 
 Acknowledgments:
 
@@ -84,7 +108,7 @@ Copyright notice:
   3. This notice may not be removed or altered from any source distribution.
 
   Jean-loup Gailly        Mark Adler
-  gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
+  jloup@gzip.org          madler@alumni.caltech.edu
 
 If you use the zlib library in a product, we would appreciate *not*
 receiving lengthy legal documents to sign. The sources are provided

adler32.c

 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: adler32.c,v 1.10 1996/05/22 11:52:18 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -18,7 +18,7 @@
 #define DO16(buf)   DO8(buf,0); DO8(buf,8);
 
 /* ========================================================================= */
-uLong adler32(adler, buf, len)
+uLong EXPORT adler32(adler, buf, len)
     uLong adler;
     const Bytef *buf;
     uInt len;

algorithm.doc → algorithm.txt

 1. Compression algorithm (deflate)
 
-The deflation algorithm used by zlib (also zip and gzip) is a variation of
+The deflation algorithm used by gzip (also zip and zlib) is a variation of
 LZ77 (Lempel-Ziv 1977, see reference below). It finds duplicated strings in
 the input data.  The second occurrence of a string is replaced by a
 pointer to the previous string, in the form of a pair (distance,
@@ -35,12 +35,12 @@ parameter of deflateInit). So deflate() does not always find the longest
 possible match but generally finds a match which is long enough.
 
 deflate() also defers the selection of matches with a lazy evaluation
-mechanism. After a match of length N has been found, deflate() searches for a
-longer match at the next input byte. If a longer match is found, the
+mechanism. After a match of length N has been found, deflate() searches for
+a longer match at the next input byte. If a longer match is found, the
 previous match is truncated to a length of one (thus producing a single
-literal byte) and the longer match is emitted afterwards.  Otherwise,
-the original match is kept, and the next match search is attempted only
-N steps later.
+literal byte) and the process of lazy evaluation begins again. Otherwise,
+the original match is kept, and the next match search is attempted only N
+steps later.
 
 The lazy match evaluation is also subject to a runtime parameter. If
 the current match is long enough, deflate() reduces the search for a longer
@@ -57,6 +57,8 @@ but saves time since there are both fewer insertions and fewer searches.
 
 2. Decompression algorithm (inflate)
 
+2.1 Introduction
+
 The real question is, given a Huffman tree, how to decode fast.  The most
 important realization is that shorter codes are much more common than
 longer codes, so pay attention to decoding the short codes fast, and let
@@ -91,8 +93,114 @@ interesting to see if optimizing the first level table for other
 applications gave values within a bit or two of the flat code size.
 
 
+2.2 More details on the inflate table lookup
+
+Ok, you want to know what this cleverly obfuscated inflate tree actually  
+looks like.  You are correct that it's not a Huffman tree.  It is simply a  
+lookup table for the first, let's say, nine bits of a Huffman symbol.  The  
+symbol could be as short as one bit or as long as 15 bits.  If a particular  
+symbol is shorter than nine bits, then that symbol's translation is duplicated
+in all those entries that start with that symbol's bits.  For example, if the  
+symbol is four bits, then it's duplicated 32 times in a nine-bit table.  If a  
+symbol is nine bits long, it appears in the table once.
+
+If the symbol is longer than nine bits, then that entry in the table points  
+to another similar table for the remaining bits.  Again, there are duplicated  
+entries as needed.  The idea is that most of the time the symbol will be short
+and there will only be one table look up.  (That's whole idea behind data  
+compression in the first place.)  For the less frequent long symbols, there  
+will be two lookups.  If you had a compression method with really long  
+symbols, you could have as many levels of lookups as is efficient.  For  
+inflate, two is enough.
+
+So a table entry either points to another table (in which case nine bits in  
+the above example are gobbled), or it contains the translation for the symbol  
+and the number of bits to gobble.  Then you start again with the next  
+ungobbled bit.
+
+You may wonder: why not just have one lookup table for how ever many bits the  
+longest symbol is?  The reason is that if you do that, you end up spending  
+more time filling in duplicate symbol entries than you do actually decoding.   
+At least for deflate's output that generates new trees every several 10's of  
+kbytes.  You can imagine that filling in a 2^15 entry table for a 15-bit code  
+would take too long if you're only decoding several thousand symbols.  At the  
+other extreme, you could make a new table for every bit in the code.  In fact,
+that's essentially a Huffman tree.  But then you spend two much time  
+traversing the tree while decoding, even for short symbols.
+
+So the number of bits for the first lookup table is a trade of the time to  
+fill out the table vs. the time spent looking at the second level and above of
+the table.
+
+Here is an example, scaled down:
+
+The code being decoded, with 10 symbols, from 1 to 6 bits long:
+
+A: 0
+B: 10
+C: 1100
+D: 11010
+E: 11011
+F: 11100
+G: 11101
+H: 11110
+I: 111110
+J: 111111
+
+Let's make the first table three bits long (eight entries):
+
+000: A,1
+001: A,1
+010: A,1
+011: A,1
+100: B,2
+101: B,2
+110: -> table X (gobble 3 bits)
+111: -> table Y (gobble 3 bits)
+
+Each entry is what the bits decode to and how many bits that is, i.e. how  
+many bits to gobble.  Or the entry points to another table, with the number of
+bits to gobble implicit in the size of the table.
+
+Table X is two bits long since the longest code starting with 110 is five bits
+long:
+
+00: C,1
+01: C,1
+10: D,2
+11: E,2
+
+Table Y is three bits long since the longest code starting with 111 is six  
+bits long:
+
+000: F,2
+001: F,2
+010: G,2
+011: G,2
+100: H,2
+101: H,2
+110: I,3
+111: J,3
+
+So what we have here are three tables with a total of 20 entries that had to  
+be constructed.  That's compared to 64 entries for a single table.  Or  
+compared to 16 entries for a Huffman tree (six two entry tables and one four  
+entry table).  Assuming that the code ideally represents the probability of  
+the symbols, it takes on the average 1.25 lookups per symbol.  That's compared
+to one lookup for the single table, or 1.66 lookups per symbol for the  
+Huffman tree.
+
+There, I think that gives you a picture of what's going on.  For inflate, the  
+meaning of a particular symbol is often more than just a letter.  It can be a  
+byte (a "literal"), or it can be either a length or a distance which  
+indicates a base value and a number of bits to fetch after the code that is  
+added to the base value.  Or it might be the special end-of-block code.  The  
+data structures created in inftrees.c try to encode all that information  
+compactly in the tables.
+
+
 Jean-loup Gailly        Mark Adler
-gzip@prep.ai.mit.edu    madler@alumni.caltech.edu
+jloup@gzip.org          madler@alumni.caltech.edu
 
 
 References:

compress.c

 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: compress.c,v 1.10 1996/05/23 16:51:12 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -19,7 +19,7 @@
    enough memory, Z_BUF_ERROR if there was not enough room in the output
    buffer.
 */
-int compress (dest, destLen, source, sourceLen)
+int EXPORT compress (dest, destLen, source, sourceLen)
     Bytef *dest;
     uLongf *destLen;
     const Bytef *source;

configure

@@ -4,6 +4,10 @@
 # of if you need special compiler, flags or install directory.
 # Otherwise, you can just use directly "make test; make install"
 #
+# To create a shared library, use "configure --shared"; by default a static
+# library is created. If the primitive shared library support provided here
+# does not work, use ftp://prep.ai.mit.edu/pub/gnu/libtool-*.tar.gz
+#
 # To impose specific compiler or flags or install directory, use for example:
 #    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
 # or for csh/tcsh users:
@@ -11,22 +15,33 @@
 # LDSHARED is the command to be used to create a shared library
 
 LIBS=libz.a
+SHAREDLIB=libz.so
 VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`
 AR=${AR-"ar rc"}
 RANLIB=${RANLIB-"ranlib"}
 prefix=${prefix-/usr/local}
 exec_prefix=${exec_prefix-$prefix}
+shared_ext='.so'
+shared=0
+
+case "$1" in
+  -s* | --s*) shared=1; shift;;
+  -h* | --h*) echo 'syntax: configure [ --shared ]'; exit 0;;
+esac
 
 test -z "$CC" && echo Checking for gcc...
 test=ztest$$
 cat > $test.c <<EOF
 int hello() { printf("hello\n"); }
 EOF
-if test -z "$CC" && (gcc -c -O3 $test.c) 2>/dev/null; then
+if test -z "$CC" -o "$CC" = "gcc" && (gcc -c -O3 $test.c) 2>/dev/null; then
   CC=gcc
   SFLAGS=${CFLAGS-"-fPIC -O3"}
   CFLAGS=${CFLAGS-"-O3"}
-  LDSHARED=${LDSHARED-"gcc -shared"}
+  case `(uname -s || echo unknown) 2>/dev/null` in
+  Linux | linux) LDSHARED=${LDSHARED-"gcc -shared -Wl,-soname,libz.so.1"};;
+  *)             LDSHARED=${LDSHARED-"gcc -shared"};;
+  esac
 else
   # find system name and corresponding cc options
   CC=${CC-cc}
@@ -50,35 +65,55 @@ else
 	     LDSHARED=${LDSHARED-"cc -dy -KPIC -G"};;
   HP-UX*)    SFLAGS=${CFLAGS-"-O +z"}
 	     CFLAGS=${CFLAGS-"-O"}
-	     LDSHARED=${LDSHARED-"ld -b"}
-	     SHAREDLIBS='libz.sl';;
-  # send working options for other systems to gzip@prep.ai.mit.edu
+	     LDSHARED=${LDSHARED-"ld -b +vnocompatwarnings"}
+	     shared_ext='.sl'
+	     SHAREDLIB='libz.sl';;
+  UNIX_System_V\ 4.2.0) 
+	     SFLAGS=${CFLAGS-"-KPIC -O"}
+	     CFLAGS=${CFLAGS-"-O"}
+	     LDSHARED=${LDSHARED-"cc -G"};;
+  # send working options for other systems to support@gzip.org
   *)         SFLAGS=${CFLAGS-"-O"}
 	     CFLAGS=${CFLAGS-"-O"}
 	     LDSHARED=${LDSHARED-"cc -shared"};;
   esac
 fi
 
-echo Checking for shared library support...
-# we must test in two steps (cc then ld), required at least on SunOS 4.x
-if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&
-   test "`($LDSHARED -o $test.so $test.o) 2>&1`" = ""; then
-  CFLAGS="$SFLAGS"
-  LIBS='libz.so.$(VER)'
-  echo Building shared library libz.so.$VER with $CC.
-else
+if test $shared -eq 1; then
+  echo Checking for shared library support...
+  # we must test in two steps (cc then ld), required at least on SunOS 4.x
+  if test "`($CC -c $SFLAGS $test.c) 2>&1`" = "" &&
+     test "`($LDSHARED -o $test$shared_ext $test.o) 2>&1`" = ""; then
+    CFLAGS="$SFLAGS"
+    LIBS="$SHAREDLIB.$VER"
+    echo Building shared library $SHAREDLIB.$VER with $CC.
+  else
+    echo No shared library suppport.
+    shared=0;
+  fi
+fi
+if test $shared -eq 0; then
   LDSHARED="$CC"
   echo Building static library $LIBS version $VER with $CC.
 fi
-rm -f $test.[co] $test.so
+rm -f $test.[co] $test$shared_ext
+
+if test -f /usr/include/unistd.h; then
+  CFLAGS="$CFLAGS -DHAVE_UNISTD_H"
+fi
+
+if test ! -f /usr/include/errno.h; then
+  CFLAGS="$CFLAGS -DNO_ERRNO_H"
+fi
 
 # udpate Makefile
 sed < Makefile.in "
-/^CC *=/s/=.*/=$CC/
+/^CC *=/s,=.*,=$CC,
 /^CFLAGS *=/s/=.*/=$CFLAGS/
-/^LDSHARED *=/s/=.*/=$LDSHARED/
+/^LDSHARED *=/s%=.*%=$LDSHARED%
 /^LIBS *=/s,=.*,=$LIBS,
-/^AR *=/s/=.*/=$AR/
+/^SHAREDLIB *=/s,=.*,=$SHAREDLIB,
+/^AR *=/s,=.*,=$AR,
 /^RANLIB *=/s,=.*,=$RANLIB,
 /^VER *=/s/=.*/=$VER/
 /^prefix *=/s,=.*,=$prefix,

contrib/README.contrib

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

contrib/asm386/gvmat32.asm

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

contrib/asm386/gvmat32c.c

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

contrib/asm386/mkgvmt32.bat

+c:\masm611\bin\ml /coff /Zi /c /Flgvmat32.lst gvmat32.asm

contrib/asm386/zlibvc.mak

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

contrib/iostream/test.cpp

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

contrib/iostream/zfstream.cpp

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

contrib/iostream/zfstream.h

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

contrib/iostream2/zstream.h

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

contrib/iostream2/zstream_test.cpp

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

contrib/untgz/Makefile

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

contrib/untgz/makefile.w32

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

contrib/untgz/untgz.c

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

contrib/visual-basic.txt

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

crc32.c

 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: crc32.c,v 1.8 1996/01/30 21:59:10 me Exp $ */
+/* @(#) $Id$ */
 
 #include "zlib.h"
 
@@ -124,7 +124,7 @@ local uLongf crc_table[256] = {
 /* =========================================================================
  * This function can be used by asm versions of crc32()
  */
-uLongf *get_crc_table()
+uLongf * EXPORT get_crc_table()
 {
 #ifdef DYNAMIC_CRC_TABLE
   if (crc_table_empty) make_crc_table();
@@ -139,7 +139,7 @@ uLongf *get_crc_table()
 #define DO8(buf)  DO4(buf); DO4(buf);
 
 /* ========================================================================= */
-uLong crc32(crc, buf, len)
+uLong EXPORT crc32(crc, buf, len)
     uLong crc;
     const Bytef *buf;
     uInt len;

deflate.c

@@ -36,8 +36,8 @@
  *
  *  REFERENCES
  *
- *      Deutsch, L.P.,"'Deflate' Compressed Data Format Specification".
- *      Available in ftp.uu.net:/pub/archiving/zip/doc/deflate-1.1.doc
+ *      Deutsch, L.P.,"DEFLATE Compressed Data Format Specification".
+ *      Available in ftp://ds.internic.net/rfc/rfc1951.txt
  *
  *      A description of the Rabin and Karp algorithm is given in the book
  *         "Algorithms" by R. Sedgewick, Addison-Wesley, p252.
@@ -47,10 +47,12 @@
  *
  */
 
+/* @(#) $Id$ */
 
 #include "deflate.h"
 
-char deflate_copyright[] = " deflate 1.0.5 Copyright 1995-1998 Jean-loup Gailly ";
+const char deflate_copyright[] =
+   " deflate 1.0.7 Copyright 1995-1998 Jean-loup Gailly ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot
@@ -76,12 +78,14 @@ local block_state deflate_stored OF((deflate_state *s, int flush));
 local block_state deflate_fast   OF((deflate_state *s, int flush));
 local block_state deflate_slow   OF((deflate_state *s, int flush));
 local void lm_init        OF((deflate_state *s));
-local uInt longest_match  OF((deflate_state *s, IPos cur_match));
 local void putShortMSB    OF((deflate_state *s, uInt b));
 local void flush_pending  OF((z_streamp strm));
 local int read_buf        OF((z_streamp strm, charf *buf, unsigned size));
 #ifdef ASMV
       void match_init OF((void)); /* asm code initialization */
+      uInt longest_match  OF((deflate_state *s, IPos cur_match));
+#else
+local uInt longest_match  OF((deflate_state *s, IPos cur_match));
 #endif
 
 #ifdef DEBUG
@@ -119,7 +123,7 @@ typedef struct config_s {
    compress_func func;
 } config;
 
-local config configuration_table[10] = {
+local const config configuration_table[10] = {
 /*      good lazy nice chain */
 /* 0 */ {0,    0,  0,    0, deflate_stored},  /* store only */
 /* 1 */ {4,    4,  8,    4, deflate_fast}, /* maximum speed, no lazy matches */
@@ -174,7 +178,7 @@ struct static_tree_desc_s {int dummy;}; /* for buggy compilers */
     zmemzero((charf *)s->head, (unsigned)(s->hash_size-1)*sizeof(*s->head));
 
 /* ========================================================================= */
-int deflateInit_(strm, level, version, stream_size)
+int EXPORT deflateInit_(strm, level, version, stream_size)
     z_streamp strm;
     int level;
     const char *version;
@@ -186,7 +190,7 @@ int deflateInit_(strm, level, version, stream_size)
 }
 
 /* ========================================================================= */
-int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
+int EXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 		  version, stream_size)
     z_streamp strm;
     int  level;
@@ -199,13 +203,14 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 {
     deflate_state *s;
     int noheader = 0;
+    static const char* my_version = ZLIB_VERSION;
 
     ushf *overlay;
     /* We overlay pending_buf and d_buf+l_buf. This works since the average
      * output size for (length,distance) codes is <= 24 bits.
      */
 
-    if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+    if (version == Z_NULL || version[0] != my_version[0] ||
         stream_size != sizeof(z_stream)) {
 	return Z_VERSION_ERROR;
     }
@@ -252,6 +257,7 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 
     overlay = (ushf *) ZALLOC(strm, s->lit_bufsize, sizeof(ush)+2);
     s->pending_buf = (uchf *) overlay;
+    s->pending_buf_size = (ulg)s->lit_bufsize * (sizeof(ush)+2L);
 
     if (s->window == Z_NULL || s->prev == Z_NULL || s->head == Z_NULL ||
         s->pending_buf == Z_NULL) {
@@ -270,7 +276,7 @@ int deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
 }
 
 /* ========================================================================= */
-int deflateSetDictionary (strm, dictionary, dictLength)
+int EXPORT deflateSetDictionary (strm, dictionary, dictLength)
     z_streamp strm;
     const Bytef *dictionary;
     uInt  dictLength;
@@ -289,7 +295,9 @@ int deflateSetDictionary (strm, dictionary, dictLength)
     if (length < MIN_MATCH) return Z_OK;
     if (length > MAX_DIST(s)) {
 	length = MAX_DIST(s);
-	dictionary += dictLength - length;
+#ifndef USE_DICT_HEAD
+	dictionary += dictLength - length; /* use the tail of the dictionary */
+#endif
     }
     zmemcpy((charf *)s->window, dictionary, length);
     s->strstart = length;
@@ -309,7 +317,7 @@ int deflateSetDictionary (strm, dictionary, dictLength)
 }
 
 /* ========================================================================= */
-int deflateReset (strm)
+int EXPORT deflateReset (strm)
     z_streamp strm;
 {
     deflate_state *s;
@@ -339,7 +347,7 @@ int deflateReset (strm)
 }
 
 /* ========================================================================= */
-int deflateParams(strm, level, strategy)
+int EXPORT deflateParams(strm, level, strategy)
     z_streamp strm;
     int level;
     int strategy;
@@ -413,7 +421,7 @@ local void flush_pending(strm)
 }
 
 /* ========================================================================= */
-int deflate (strm, flush)
+int EXPORT deflate (strm, flush)
     z_streamp strm;
     int flush;
 {
@@ -547,42 +555,85 @@ int deflate (strm, flush)
 }
 
 /* ========================================================================= */
-int deflateEnd (strm)
+int EXPORT deflateEnd (strm)
     z_streamp strm;
 {
     int status;
 
     if (strm == Z_NULL || strm->state == Z_NULL) return Z_STREAM_ERROR;
 
+    status = strm->state->status;
+    if (status != INIT_STATE && status != BUSY_STATE &&
+	status != FINISH_STATE) {
+      return Z_STREAM_ERROR;
+    }
+
     /* Deallocate in reverse order of allocations: */
     TRY_FREE(strm, strm->state->pending_buf);
     TRY_FREE(strm, strm->state->head);
     TRY_FREE(strm, strm->state->prev);
     TRY_FREE(strm, strm->state->window);
 
-    status = strm->state->status;
     ZFREE(strm, strm->state);
     strm->state = Z_NULL;
 
     return status == BUSY_STATE ? Z_DATA_ERROR : Z_OK;
 }
 
-/* ========================================================================= */
-int deflateCopy (dest, source)
+/* =========================================================================
+ * Copy the source state to the destination state.
+ * To simplify the source, this is not supported for 16-bit MSDOS (which
+ * doesn't have enough memory anyway to duplicate compression states).
+ */
+int EXPORT deflateCopy (dest, source)
     z_streamp dest;
     z_streamp source;
 {
-    if (source == Z_NULL || dest == Z_NULL || source->state == Z_NULL) {
+#ifdef MAXSEG_64K
+    return Z_STREAM_ERROR;
+#else
+    deflate_state *ds;
+    deflate_state *ss;
+    ushf *overlay;
+
+    ss = source->state;
+
+    if (source == Z_NULL || dest == Z_NULL || ss == Z_NULL) {
         return Z_STREAM_ERROR;
     }
     *dest = *source;
-    return Z_STREAM_ERROR; /* to be implemented */
-#if 0
-    dest->state = (struct internal_state FAR *)
-        (*dest->zalloc)(1, sizeof(deflate_state));
-    if (dest->state == Z_NULL) return Z_MEM_ERROR;
 
-    *(dest->state) = *(source->state);
+    ds = (deflate_state *) ZALLOC(dest, 1, sizeof(deflate_state));
+    if (ds == Z_NULL) return Z_MEM_ERROR;
+    dest->state = (struct internal_state FAR *) ds;
+    *ds = *ss;
+    ds->strm = dest;
+
+    ds->window = (Bytef *) ZALLOC(dest, ds->w_size, 2*sizeof(Byte));
+    ds->prev   = (Posf *)  ZALLOC(dest, ds->w_size, sizeof(Pos));
+    ds->head   = (Posf *)  ZALLOC(dest, ds->hash_size, sizeof(Pos));
+    overlay = (ushf *) ZALLOC(dest, ds->lit_bufsize, sizeof(ush)+2);
+    ds->pending_buf = (uchf *) overlay;
+
+    if (ds->window == Z_NULL || ds->prev == Z_NULL || ds->head == Z_NULL ||
+        ds->pending_buf == Z_NULL) {
+        deflateEnd (dest);
+        return Z_MEM_ERROR;
+    }
+    /* following zmemcpy do not work for 16-bit MSDOS */
+    zmemcpy(ds->window, ss->window, ds->w_size * 2 * sizeof(Byte));
+    zmemcpy(ds->prev, ss->prev, ds->w_size * sizeof(Pos));
+    zmemcpy(ds->head, ss->head, ds->hash_size * sizeof(Pos));
+    zmemcpy(ds->pending_buf, ss->pending_buf, (uInt)ds->pending_buf_size);
+
+    ds->pending_out = ds->pending_buf + (ss->pending_out - ss->pending_buf);
+    ds->d_buf = overlay + ds->lit_bufsize/sizeof(ush);
+    ds->l_buf = ds->pending_buf + (1+sizeof(ush))*ds->lit_bufsize;
+
+    ds->l_desc.dyn_tree = ds->dyn_ltree;
+    ds->d_desc.dyn_tree = ds->dyn_dtree;
+    ds->bl_desc.dyn_tree = ds->bl_tree;
+
     return Z_OK;
 #endif
 }
@@ -815,7 +866,7 @@ local void check_match(s, start, match, length)
 	} while (--length != 0);
         z_error("invalid match");
     }
-    if (verbose > 1) {
+    if (z_verbose > 1) {
         fprintf(stderr,"\\[%d,%d]", start-match, length);
         do { putc(s->window[start++], stderr); } while (--length != 0);
     }
@@ -864,29 +915,30 @@ local void fill_window(s)
                    (unsigned)wsize);
             s->match_start -= wsize;
             s->strstart    -= wsize; /* we now have strstart >= MAX_DIST */
-
             s->block_start -= (long) wsize;
 
             /* Slide the hash table (could be avoided with 32 bit values
-               at the expense of memory usage):
+               at the expense of memory usage). We slide even when level == 0
+               to keep the hash table consistent if we switch back to level > 0
+               later. (Using level 0 permanently is not an optimal usage of
+               zlib, so we don't care about this pathological case.)
              */
-            n = s->hash_size;
-            p = &s->head[n];
-            do {
-                m = *--p;
-                *p = (Pos)(m >= wsize ? m-wsize : NIL);
-            } while (--n);
-
-            n = wsize;
-            p = &s->prev[n];
-            do {
-                m = *--p;
-                *p = (Pos)(m >= wsize ? m-wsize : NIL);
-                /* If n is not on any hash chain, prev[n] is garbage but
-                 * its value will never be used.
-                 */
-            } while (--n);
-
+	    n = s->hash_size;
+	    p = &s->head[n];
+	    do {
+		m = *--p;
+		*p = (Pos)(m >= wsize ? m-wsize : NIL);
+	    } while (--n);
+
+	    n = wsize;
+	    p = &s->prev[n];
+	    do {
+		m = *--p;
+		*p = (Pos)(m >= wsize ? m-wsize : NIL);
+		/* If n is not on any hash chain, prev[n] is garbage but
+		 * its value will never be used.
+		 */
+	    } while (--n);
             more += wsize;
         }
         if (s->strm->avail_in == 0) return;
@@ -950,12 +1002,24 @@ local void fill_window(s)
  * This function does not insert new strings in the dictionary since
  * uncompressible data is probably not useful. This function is used
  * only for the level=0 compression option.
- * NOTE: this function should be optimized to avoid extra copying.
+ * NOTE: this function should be optimized to avoid extra copying from
+ * window to pending_buf.
  */
 local block_state deflate_stored(s, flush)
     deflate_state *s;
     int flush;
 {
+    /* Stored blocks are limited to 0xffff bytes, pending_buf is limited
+     * to pending_buf_size, and each stored block has a 5 byte header:
+     */
+    ulg max_block_size = 0xffff;
+    ulg max_start;
+
+    if (max_block_size > s->pending_buf_size - 5) {
+        max_block_size = s->pending_buf_size - 5;
+    }
+
+    /* Copy as much as possible from input to output: */
     for (;;) {
         /* Fill the window as much as possible: */
         if (s->lookahead <= 1) {
@@ -973,14 +1037,17 @@ local block_state deflate_stored(s, flush)
 	s->strstart += s->lookahead;
 	s->lookahead = 0;
 
-        /* Stored blocks are limited to 0xffff bytes: */
-        if (s->strstart == 0 || s->strstart > 0xfffe) {
+	/* Emit a stored block if pending_buf will be full: */
+ 	max_start = s->block_start + max_block_size;
+        if (s->strstart == 0 || (ulg)s->strstart >= max_start) {
 	    /* strstart == 0 is possible when wraparound on 16-bit machine */
-	    s->lookahead = s->strstart - 0xffff;
-	    s->strstart = 0xffff;
+	    s->lookahead = (uInt)(s->strstart - max_start);
+	    s->strstart = (uInt)max_start;
+            FLUSH_BLOCK(s, 0);
 	}
-
-	/* Emit a stored block if it is large enough: */
+	/* Flush if we may have to slide, otherwise block_start may become
+         * negative and the data will be gone:
+         */
         if (s->strstart - (uInt)s->block_start >= MAX_DIST(s)) {
             FLUSH_BLOCK(s, 0);
 	}

deflate.h

 /* deflate.h -- internal compression state
- * Copyright (C) 1995-1996 Jean-loup Gailly
+ * Copyright (C) 1995-1998 Jean-loup Gailly
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -8,7 +8,7 @@
    subject to change. Applications should only use zlib.h.
  */
 
-/* $Id: deflate.h,v 1.10 1996/07/02 12:41:00 me Exp $ */
+/* @(#) $Id$ */
 
 #ifndef _DEFLATE_H
 #define _DEFLATE_H
@@ -83,6 +83,7 @@ typedef struct internal_state {
     z_streamp strm;      /* pointer back to this zlib stream */
     int   status;        /* as the name implies */
     Bytef *pending_buf;  /* output still pending */
+    ulg   pending_buf_size; /* size of pending_buf */
     Bytef *pending_out;  /* next pending byte to output to the stream */
     int   pending;       /* nb of bytes in the pending buffer */
     int   noheader;      /* suppress zlib header and adler32 */

example.c

 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
-/* $Id: example.c,v 1.16 1996/05/23 17:11:28 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -86,16 +86,17 @@ void test_gzio(out, in, uncompr, uncomprLen)
     int err;
     int len = strlen(hello)+1;
     gzFile file;
+    z_off_t pos;
 
     file = gzopen(out, "wb");
     if (file == NULL) {
         fprintf(stderr, "gzopen error\n");
         exit(1);
     }
-
-    if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) {
-        fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
+    if (gzprintf(file, "%s, %s!", "hello", "hello") != len-1) {
+        fprintf(stderr, "gzprintf err: %s\n", gzerror(file, &err));
     }
+    gzseek(file, 1L, SEEK_CUR); /* add one zero byte */
     gzclose(file);
 
     file = gzopen(in, "rb");
@@ -108,13 +109,28 @@ void test_gzio(out, in, uncompr, uncomprLen)
     if (uncomprLen != len) {
         fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
     }
-    gzclose(file);
-
     if (strcmp((char*)uncompr, hello)) {
         fprintf(stderr, "bad gzread\n");
     } else {
         printf("gzread(): %s\n", uncompr);
     }
+
+    pos = gzseek(file, -7L, SEEK_CUR);
+    if (pos != 7 || gztell(file) != pos) {
+	fprintf(stderr, "gzseek error, pos=%ld, gztell=%ld\n",
+		pos, gztell(file));
+    }
+    uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
+    if (uncomprLen != 7) {
+        fprintf(stderr, "gzread err after gzseek: %s\n", gzerror(file, &err));
+    }
+    if (strcmp((char*)uncompr, hello+7)) {
+        fprintf(stderr, "bad gzread after gzseek\n");
+    } else {
+        printf("gzread() after gzseek: %s\n", uncompr);
+    }
+
+    gzclose(file);
 }
 
 /* ===========================================================================
@@ -171,12 +187,13 @@ void test_inflate(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
-    err = inflateInit(&d_stream);
-    CHECK_ERR(err, "inflateInit");
-
     d_stream.next_in  = compr;
+    d_stream.avail_in = 0;
     d_stream.next_out = uncompr;
 
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
     while (d_stream.total_out < uncomprLen && d_stream.total_in < comprLen) {
         d_stream.avail_in = d_stream.avail_out = 1; /* force small buffers */
         err = inflate(&d_stream, Z_NO_FLUSH);
@@ -263,12 +280,12 @@ void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
-    err = inflateInit(&d_stream);
-    CHECK_ERR(err, "inflateInit");
-
     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;
 
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
     for (;;) {
         d_stream.next_out = uncompr;            /* discard the output */
 	d_stream.avail_out = (uInt)uncomprLen;
@@ -339,12 +356,13 @@ void test_sync(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
+    d_stream.next_in  = compr;
+    d_stream.avail_in = 2; /* just read the zlib header */
+
     err = inflateInit(&d_stream);
     CHECK_ERR(err, "inflateInit");
 
-    d_stream.next_in  = compr;
     d_stream.next_out = uncompr;
-    d_stream.avail_in = 2; /* just read the zlib header */
     d_stream.avail_out = (uInt)uncomprLen;
 
     inflate(&d_stream, Z_NO_FLUSH);
@@ -417,12 +435,12 @@ void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
     d_stream.zfree = (free_func)0;
     d_stream.opaque = (voidpf)0;
 
-    err = inflateInit(&d_stream);
-    CHECK_ERR(err, "inflateInit");
-
     d_stream.next_in  = compr;
     d_stream.avail_in = (uInt)comprLen;
 
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+
     d_stream.next_out = uncompr;
     d_stream.avail_out = (uInt)uncomprLen;
 
@@ -461,8 +479,9 @@ int main(argc, argv)
     Byte *compr, *uncompr;
     uLong comprLen = 10000*sizeof(int); /* don't overflow on MSDOS */
     uLong uncomprLen = comprLen;
+    static const char* myVersion = ZLIB_VERSION;
 
-    if (zlibVersion()[0] != ZLIB_VERSION[0]) {
+    if (zlibVersion()[0] != myVersion[0]) {
         fprintf(stderr, "incompatible zlib version\n");
         exit(1);
 
@@ -479,7 +498,6 @@ int main(argc, argv)
         printf("out of memory\n");
 	exit(1);
     }
-
     test_compress(compr, comprLen, uncompr, uncomprLen);
 
     test_gzio((argc > 1 ? argv[1] : "foo.gz"),

gzio.c

 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h
+ *
+ * Compile this file with -DNO_DEFLATE to avoid the compression code.
  */
 
-/* $Id: gzio.c,v 1.14 1996/07/24 13:41:01 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 
@@ -38,10 +40,12 @@ typedef struct gz_stream {
     char     *path;   /* path name for debugging only */
     int      transparent; /* 1 if input file is not a .gz file */
     char     mode;    /* 'w' or 'r' */
+    long     startpos; /* start of compressed data in file (header skipped) */
 } gz_stream;
 
 
 local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
+local int do_flush        OF((gzFile file, int flush));
 local int    get_byte     OF((gz_stream *s));
 local void   check_header OF((gz_stream *s));
 local int    destroy      OF((gz_stream *s));
@@ -64,6 +68,7 @@ local gzFile gz_open (path, mode, fd)
 {
     int err;
     int level = Z_DEFAULT_COMPRESSION; /* compression level */
+    int strategy = Z_DEFAULT_STRATEGY; /* compression strategy */
     char *p = (char*)mode;
     gz_stream *s;
     char fmode[80]; /* copy of mode, without the compression level */
@@ -99,6 +104,10 @@ local gzFile gz_open (path, mode, fd)
         if (*p == 'w' || *p == 'a') s->mode = 'w';
         if (*p >= '0' && *p <= '9') {
 	    level = *p - '0';
+	} else if (*p == 'f') {
+	  strategy = Z_FILTERED;
+	} else if (*p == 'h') {
+	  strategy = Z_HUFFMAN_ONLY;
 	} else {
 	    *m++ = *p; /* copy the mode */
 	}
@@ -106,19 +115,24 @@ local gzFile gz_open (path, mode, fd)
     if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
     
     if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+        err = Z_STREAM_ERROR;
+#else
         err = deflateInit2(&(s->stream), level,
-                           Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
+                           Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, strategy);
         /* windowBits is passed < 0 to suppress zlib header */
 
         s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
-
+#endif
         if (err != Z_OK || s->outbuf == Z_NULL) {
             return destroy(s), (gzFile)Z_NULL;
         }
     } else {
-        err = inflateInit2(&(s->stream), -MAX_WBITS);
         s->stream.next_in  = s->inbuf = (Byte*)ALLOC(Z_BUFSIZE);
 
+        err = inflateInit2(&(s->stream), -MAX_WBITS);
+        /* windowBits is passed < 0 to tell that there is no zlib header */
+
         if (err != Z_OK || s->inbuf == Z_NULL) {
             return destroy(s), (gzFile)Z_NULL;
         }
@@ -126,7 +140,7 @@ local gzFile gz_open (path, mode, fd)
     s->stream.avail_out = Z_BUFSIZE;
 
     errno = 0;
-    s->file = fd < 0 ? FOPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
+    s->file = fd < 0 ? F_OPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
 
     if (s->file == NULL) {
         return destroy(s), (gzFile)Z_NULL;
@@ -136,16 +150,19 @@ local gzFile gz_open (path, mode, fd)
          */
         fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
              Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+	s->startpos = ftell(s->file);
     } else {
 	check_header(s); /* skip the .gz header */
+	s->startpos = (ftell(s->file) - s->stream.avail_in);
     }
+    
     return (gzFile)s;
 }
 
 /* ===========================================================================
      Opens a gzip (.gz) file for reading or writing.
 */
-gzFile gzopen (path, mode)
+gzFile EXPORT gzopen (path, mode)
     const char *path;
     const char *mode;
 {
@@ -156,7 +173,7 @@ gzFile gzopen (path, mode)
      Associate a gzFile with the file descriptor fd. fd is not dup'ed here
    to mimic the behavio(u)r of fdopen.
 */
-gzFile gzdopen (fd, mode)
+gzFile EXPORT gzdopen (fd, mode)
     int fd;
     const char *mode;
 {
@@ -168,6 +185,31 @@ gzFile gzdopen (fd, mode)
     return gz_open (name, mode, fd);
 }
 
+/* ===========================================================================
+ * Update the compression level and strategy
+ */
+int EXPORT gzsetparams (file, level, strategy)
+    gzFile file;
+    int level;
+    int strategy;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
+
+    /* Make room to allow flushing */
+    if (s->stream.avail_out == 0) {
+
+	s->stream.next_out = s->outbuf;
+	if (fwrite(s->outbuf, 1, Z_BUFSIZE, s->file) != Z_BUFSIZE) {
+	    s->z_err = Z_ERRNO;
+	}
+	s->stream.avail_out = Z_BUFSIZE;
+    }
+
+    return deflateParams (&(s->stream), level, strategy);
+}
+
 /* ===========================================================================
      Read a byte from a gz_stream; update next_in and avail_in. Return EOF
    for end of file.
@@ -212,8 +254,11 @@ local void check_header(s)
     for (len = 0; len < 2; len++) {
 	c = get_byte(s);
 	if (c != gz_magic[len]) {
-	    s->transparent = 1;
-	    if (c != EOF) s->stream.avail_in++, s->stream.next_in--;
+	    if (len != 0) s->stream.avail_in++, s->stream.next_in--;
+	    if (c != EOF) {
+		s->stream.avail_in++, s->stream.next_in--;
+		s->transparent = 1;
+	    }
 	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
 	    return;
 	}
@@ -260,14 +305,21 @@ local int destroy (s)
     TRYFREE(s->msg);
 
     if (s->stream.state != NULL) {
-       if (s->mode == 'w') {
-           err = deflateEnd(&(s->stream));
-       } else if (s->mode == 'r') {
-           err = inflateEnd(&(s->stream));
-       }
+	if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+	    err = Z_STREAM_ERROR;
+#else
+	    err = deflateEnd(&(s->stream));
+#endif
+	} else if (s->mode == 'r') {
+	    err = inflateEnd(&(s->stream));
+	}
     }
     if (s->file != NULL && fclose(s->file)) {
-        err = Z_ERRNO;
+#ifdef ESPIPE
+	if (errno != ESPIPE) /* fclose is broken for pipes in HP/UX */
+#endif
+	    err = Z_ERRNO;
     }
     if (s->z_err < 0) err = s->z_err;
 
@@ -282,13 +334,13 @@ local int destroy (s)
      Reads the given number of uncompressed bytes from the compressed file.
    gzread returns the number of bytes actually read (0 for end of file).
 */
-int gzread (file, buf, len)
+int EXPORT gzread (file, buf, len)
     gzFile file;
     voidp buf;
     unsigned len;
 {
     gz_stream *s = (gz_stream*)file;
-    Bytef *start = buf; /* starting point for crc computation */
+    Bytef *start = (Bytef*)buf; /* starting point for crc computation */
     Byte  *next_out; /* == stream.next_out but not forced far (for MSDOS) */
 
     if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
@@ -296,7 +348,8 @@ int gzread (file, buf, len)
     if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
     if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
 
-    s->stream.next_out = next_out = buf;
+    next_out = (Byte*)buf;
+    s->stream.next_out = (Bytef*)buf;
     s->stream.avail_out = len;
 
     while (s->stream.avail_out != 0) {
@@ -345,7 +398,12 @@ int gzread (file, buf, len)
 		/* Check for concatenated .gz files: */
 		check_header(s);
 		if (s->z_err == Z_OK) {
+		    uLong total_in = s->stream.total_in;
+		    uLong total_out = s->stream.total_out;
+
 		    inflateReset(&(s->stream));
+		    s->stream.total_in = total_in;
+		    s->stream.total_out = total_out;
 		    s->crc = crc32(0L, Z_NULL, 0);
 		}
 	    }
@@ -357,11 +415,26 @@ int gzread (file, buf, len)
     return (int)(len - s->stream.avail_out);
 }
 
+
+/* ===========================================================================
+      Reads one byte from the compressed file. gzgetc returns this byte
+   or -1 in case of end of file or error.
+*/
+int EXPORT gzgetc(file)
+    gzFile file;
+{
+    int c;
+
+    return gzread(file, &c, 1) == 1 ? c : -1;
+}
+
+
+#ifndef NO_DEFLATE
 /* ===========================================================================
      Writes the given number of uncompressed bytes into the compressed file.
    gzwrite returns the number of bytes actually written (0 in case of error).
 */
-int gzwrite (file, buf, len)
+int EXPORT gzwrite (file, buf, len)
     gzFile file;
     const voidp buf;
     unsigned len;
@@ -370,7 +443,7 @@ int gzwrite (file, buf, len)
 
     if (s == NULL || s->mode != 'w') return Z_STREAM_ERROR;
 
-    s->stream.next_in = buf;
+    s->stream.next_in = (Bytef*)buf;
     s->stream.avail_in = len;
 
     while (s->stream.avail_in != 0) {
@@ -387,18 +460,79 @@ int gzwrite (file, buf, len)
         s->z_err = deflate(&(s->stream), Z_NO_FLUSH);
         if (s->z_err != Z_OK) break;
     }
-    s->crc = crc32(s->crc, buf, len);
+    s->crc = crc32(s->crc, (const Bytef *)buf, len);
 
     return (int)(len - s->stream.avail_in);
 }
 
+/* ===========================================================================
+     Converts, formats, and writes the args to the compressed file under
+   control of the format string, as in fprintf. gzprintf returns the number of
+   uncompressed bytes actually written (0 in case of error).
+*/
+#ifdef STDC
+#include <stdarg.h>
+
+int EXPORTVA gzprintf (gzFile file, const char *format, /* args */ ...)
+{
+    char buf[Z_BUFSIZE];
+    va_list va;
+    int len;
+
+    va_start(va, format);
+#ifdef HAS_vsnprintf
+    len = vsnprintf(buf, sizeof(buf), format, va);
+#else
+    len = vsprintf(buf, format, va);
+#endif
+    va_end(va);
+    if (len <= 0) return 0;
+
+    return gzwrite(file, buf, (unsigned)len);
+}
+#else /* not ANSI C */
+
+int EXPORTVA gzprintf (file, format, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+	               a11, a12, a13, a14, a15, a16, a17, a18, a19, a20)
+    gzFile file;
+    const char *format;
+    int a1, a2, a3, a4, a5, a6, a7, a8, a9, a10,
+	a11, a12, a13, a14, a15, a16, a17, a18, a19, a20;
+{
+    char buf[Z_BUFSIZE];
+    int len;
+
+#ifdef HAS_snprintf
+    snprintf(buf, sizeof(buf), format, a1, a2, a3, a4, a5, a6, a7, a8,
+	     a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#else
+    sprintf(buf, format, a1, a2, a3, a4, a5, a6, a7, a8,
+	    a9, a10, a11, a12, a13, a14, a15, a16, a17, a18, a19, a20);
+#endif
+    len = strlen(buf); /* old sprintf doesn't return the nb of bytes written */
+    if (len <= 0) return 0;
+
+    return gzwrite(file, buf, len);
+}
+#endif
+
+/* ===========================================================================
+      Writes c, converted to an unsigned char, into the compressed file.
+   gzputc returns the value that was written, or -1 in case of error.
+*/
+int EXPORT gzputc(file, c)
+    gzFile file;
+    int c;
+{
+    return gzwrite(file, &c, 1) == 1 ? c : -1;
+}
+
+
 /* ===========================================================================
      Flushes all pending output into the compressed file. The parameter
    flush is as in the deflate() function.
-     gzflush should be called only when strictly necessary because it can
-   degrade compression.
 */
-int gzflush (file, flush)
+local int do_flush (file, flush)
     gzFile file;
     int flush;
 {
@@ -424,6 +558,9 @@ int gzflush (file, flush)
         if (done) break;
         s->z_err = deflate(&(s->stream), flush);
 
+	/* Ignore the second of two consecutive flushes: */
+	if (len == 0 && s->z_err == Z_BUF_ERROR) s->z_err = Z_OK;
+
         /* deflate has finished flushing only when it hasn't used up
          * all the available space in the output buffer: 
          */
@@ -431,9 +568,154 @@ int gzflush (file, flush)
  
         if (s->z_err != Z_OK && s->z_err != Z_STREAM_END) break;
     }
+    return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
+}
+
+int EXPORT gzflush (file, flush)
+     gzFile file;
+     int flush;
+{
+    gz_stream *s = (gz_stream*)file;
+    int err = do_flush (file, flush);
+
+    if (err) return err;
     fflush(s->file);
     return  s->z_err == Z_STREAM_END ? Z_OK : s->z_err;
 }
+#endif /* NO_DEFLATE */
+
+/* ===========================================================================
+      Sets the starting position for the next gzread or gzwrite on the given
+   compressed file. The offset represents a number of bytes in the
+      gzseek returns the resulting offset location as measured in bytes from
+   the beginning of the uncompressed stream, or -1 in case of error.
+      SEEK_END is not implemented, returns error.
+      In this version of the library, gzseek can be extremely slow.
+*/
+z_off_t EXPORT gzseek (file, offset, whence)
+    gzFile file;
+    z_off_t offset;
+    int whence;
+{
+    gz_stream *s = (gz_stream*)file;
+
+    if (s == NULL || whence == SEEK_END || s->z_err == Z_ERRNO) return -1L;
+
+    s->z_err = Z_OK;
+    s->z_eof = 0;
+    
+    if (s->mode == 'w') {
+#ifdef NO_DEFLATE
+	return -1L;
+#else
+	if (whence == SEEK_SET) {
+	    offset -= s->stream.total_out;
+	}
+	if (offset < 0) return -1L;
+
+	/* At this point, offset is the number of zero bytes to write. */
+	if (s->inbuf == Z_NULL) {
+	    s->inbuf = (Byte*)ALLOC(Z_BUFSIZE); /* for seeking */
+	    zmemzero(s->inbuf, Z_BUFSIZE);
+	}
+	while (offset > 0)  {
+	    uInt size = Z_BUFSIZE;
+	    if (offset < Z_BUFSIZE) size = (uInt)offset;
+
+	    size = gzwrite(file, s->inbuf, size);
+	    if (size == 0) return -1L;
+
+	    offset -= size;
+	}
+	return s->stream.total_in;
+#endif
+    }
+    /* Rest of function is for reading only */
+
+    if (s->z_err == Z_DATA_ERROR) return -1L;
+
+    /* compute absolute position */
+    if (whence == SEEK_CUR) {
+	offset += s->stream.total_out;
+    }
+    if (offset < 0) return -1L;
+
+    if (s->transparent) {
+	/* map to fseek */
+	s->stream.avail_in = 0;
+	s->stream.next_in = s->inbuf;
+	if (fseek(s->file, offset, SEEK_SET) < 0) return -1L;
+	return offset;
+    }
+
+    /* For a negative seek, rewind and use positive seek */
+    if ((uLong)offset >= s->stream.total_out) {
+	offset -= s->stream.total_out;
+    } else if (gzrewind(file) < 0) {
+	return -1L;
+    }
+    /* offset is now the number of bytes to skip. */
+
+    if (offset != 0 && s->outbuf == Z_NULL) {
+	s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
+    }
+    while (offset > 0)  {
+	int size = Z_BUFSIZE;
+	if (offset < Z_BUFSIZE) size = (int)offset;
+
+	size = gzread(file, s->outbuf, (uInt)size);
+	if (size <= 0) return -1L;
+	offset -= size;
+    }
+    return s->stream.total_out;
+}
+
+/* ===========================================================================
+     Rewinds input file. 
+*/
+int EXPORT gzrewind (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+    
+    if (s == NULL || s->mode != 'r') return -1;
+
+    s->z_err = Z_OK;
+    s->z_eof = 0;
+    s->stream.avail_in = 0;
+    s->stream.next_in = s->inbuf;
+	
+    if (s->startpos == 0) { /* not a compressed file */
+	rewind(s->file);
+	return 0;
+    }
+
+    (void) inflateReset(&s->stream);
+    return fseek(s->file, s->startpos, SEEK_SET);
+}
+
+/* ===========================================================================
+     Returns the starting position for the next gzread or gzwrite on the
+   given compressed file. This position represents a number of bytes in the
+   uncompressed data stream.
+*/
+z_off_t EXPORT gztell (file)
+    gzFile file;
+{
+    return gzseek(file, 0L, SEEK_CUR);
+}
+
+/* ===========================================================================
+     Returns 1 when EOF has previously been detected reading the given
+   input stream, otherwise zero.
+*/
+int EXPORT gzeof (file)
+    gzFile file;
+{
+    gz_stream *s = (gz_stream*)file;
+    
+    return (s == NULL || s->mode != 'r') ? 0 : s->z_eof;
+}
 
 /* ===========================================================================
    Outputs a long in LSB order to the given file
@@ -470,7 +752,7 @@ local uLong getLong (s)
      Flushes all pending output if necessary, closes the compressed file
    and deallocates all the (de)compression state.
 */
-int gzclose (file)
+int EXPORT gzclose (file)
     gzFile file;
 {
     int err;
@@ -479,14 +761,17 @@ int gzclose (file)
     if (s == NULL) return Z_STREAM_ERROR;
 
     if (s->mode == 'w') {
-        err = gzflush (file, Z_FINISH);
-        if (err != Z_OK) return destroy(file);
+#ifdef NO_DEFLATE
+	return Z_STREAM_ERROR;
+#else
+        err = do_flush (file, Z_FINISH);
+        if (err != Z_OK) return destroy((gz_stream*)file);
 
         putLong (s->file, s->crc);
         putLong (s->file, s->stream.total_in);
-
+#endif
     }
-    return destroy(file);
+    return destroy((gz_stream*)file);
 }
 
 /* ===========================================================================
@@ -496,7 +781,7 @@ int gzclose (file)
    errnum is set to Z_ERRNO and the application may consult errno
    to get the exact error code.
 */
-const char*  gzerror (file, errnum)
+const char*  EXPORT gzerror (file, errnum)
     gzFile file;
     int *errnum;
 {

infblock.c

@@ -66,7 +66,7 @@ inflate_blocks_statef *s;
 z_streamp z;
 uLongf *c;
 {
-  if (s->checkfn != Z_NULL)
+  if (c != Z_NULL)
     *c = s->check;
   if (s->mode == BTREE || s->mode == DTREE)
     ZFREE(z, s->sub.trees.blens);
@@ -81,7 +81,7 @@ uLongf *c;
   s->bitb = 0;
   s->read = s->write = s->window;
   if (s->checkfn != Z_NULL)
-    z->adler = s->check = (*s->checkfn)(0L, Z_NULL, 0);
+    z->adler = s->check = (*s->checkfn)(0L, (const Bytef *)Z_NULL, 0);
   Trace((stderr, "inflate:   blocks reset\n"));
 }
 
@@ -105,7 +105,7 @@ uInt w;
   s->checkfn = c;
   s->mode = TYPE;
   Trace((stderr, "inflate:   blocks allocated\n"));
-  inflate_blocks_reset(s, z, &s->check);
+  inflate_blocks_reset(s, z, Z_NULL);
   return s;
 }
 
@@ -380,12 +380,11 @@ int r;
 }
 
 
-int inflate_blocks_free(s, z, c)
+int inflate_blocks_free(s, z)
 inflate_blocks_statef *s;
 z_streamp z;
-uLongf *c;
 {
-  inflate_blocks_reset(s, z, c);
+  inflate_blocks_reset(s, z, Z_NULL);
   ZFREE(z, s->window);
   ZFREE(z, s);
   Trace((stderr, "inflate:   blocks freed\n"));
@@ -401,3 +400,14 @@ uInt  n;
   zmemcpy((charf *)s->window, d, n);
   s->read = s->write = s->window + n;
 }
+
+
+/* Returns true if inflate is currently at the end of a block generated
+ * by Z_SYNC_FLUSH or Z_FULL_FLUSH. 
+ * IN assertion: s != Z_NULL
+ */
+int inflate_blocks_sync_point(s)
+inflate_blocks_statef *s;
+{
+  return s->mode == LENS;
+}

infblock.h

 /* infblock.h -- header to use infblock.c
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -28,10 +28,12 @@ extern void inflate_blocks_reset OF((
 
 extern int inflate_blocks_free OF((
     inflate_blocks_statef *,
-    z_streamp ,
-    uLongf *));                  /* check value on output */
+    z_streamp));
 
 extern void inflate_set_dictionary OF((
     inflate_blocks_statef *s,
     const Bytef *d,  /* dictionary */
     uInt  n));       /* dictionary length */
+
+extern int inflate_blocks_sync_point OF((
+    inflate_blocks_statef *s));

infcodes.c

 /* infcodes.c -- process literals and length/distance pairs
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -16,11 +16,7 @@
 #define exop word.what.Exop
 #define bits word.what.Bits
 
-/* inflate codes private state */
-struct inflate_codes_state {
-
-  /* mode */
-  enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
+typedef enum {        /* waiting for "i:"=input, "o:"=output, "x:"=nothing */
       START,    /* x: set up for LEN */
       LEN,      /* i: get length/literal/eob next */
       LENEXT,   /* i: getting length extra (have base) */
@@ -31,7 +27,13 @@ struct inflate_codes_state {
       WASH,     /* o: got eob, possibly still output waiting */
       END,      /* x: got eob and all data flushed */
       BADCODE}  /* x: got error */
-    mode;               /* current inflate_codes mode */
+inflate_codes_mode;
+
+/* inflate codes private state */
+struct inflate_codes_state {
+
+  /* mode */
+  inflate_codes_mode mode;      /* current inflate_codes mode */
 
   /* mode dependent information */
   uInt len;
@@ -235,6 +237,9 @@ int r;
       r = Z_STREAM_ERROR;
       LEAVE
   }
+#ifdef NEED_DUMMY_RETURN
+  return Z_STREAM_ERROR;  /* Some dumb compilers complain without this */
+#endif
 }
 
 

infcodes.h

 /* infcodes.h -- header to use infcodes.c
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 

inffast.c

 /* inffast.c -- process literals and length/distance pairs fast
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 

inffast.h

 /* inffast.h -- header to use inffast.c
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 

inftrees.c

@@ -6,7 +6,8 @@
 #include "zutil.h"
 #include "inftrees.h"
 
-char inflate_copyright[] = " inflate 1.0.5 Copyright 1995-1998 Mark Adler ";
+const char inflate_copyright[] =
+   " inflate 1.0.7 Copyright 1995-1998 Mark Adler ";
 /*
   If you use the zlib library in a product, an acknowledgment is welcome
   in the documentation of your product. If for some reason you cannot

inftrees.h

 /* inftrees.h -- header to use inftrees.c
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 

infutil.c

 /* inflate_util.c -- data and routines common to blocks and codes
- * Copyright (C) 1995-1996 Mark Adler
+ * Copyright (C) 1995-1998 Mark Adler
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 

infutil.h

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

minigzip.c

 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995-1996 Jean-loup Gailly.
+ * Copyright (C) 1995-1998 Jean-loup Gailly.
  * For conditions of distribution and use, see copyright notice in zlib.h 
  */
 
@@ -13,7 +13,7 @@
  * or in pipe mode.
  */
 
-/* $Id: minigzip.c,v 1.10 1996/07/24 13:41:04 me Exp $ */
+/* @(#) $Id$ */
 
 #include <stdio.h>
 #include "zlib.h"
@@ -47,18 +47,19 @@
 #ifndef GZ_SUFFIX
 #  define GZ_SUFFIX ".gz"
 #endif
-#define SUFFIX_LEN sizeof(GZ_SUFFIX)
+#define SUFFIX_LEN (sizeof(GZ_SUFFIX)-1)
 
 extern int unlink OF((const char *));
 
 #define BUFLEN 4096
 #define MAX_NAME_LEN 1024
 
-#define local static
-/* For MSDOS and other systems with limitation on stack size. For Unix,
-    #define local
-   works also.
- */
+#ifdef MAXSEG_64K
+#  define local static
+   /* Needed for systems with limitation on stack size. */
+#else
+#  define local
+#endif
 
 char *prog;
 
@@ -201,7 +202,11 @@ void file_uncompress(file)
 
 
 /* ===========================================================================
- * Usage:  minigzip [-d] [files...]
+ * Usage:  minigzip [-d] [-f] [-h] [-1 to -9] [files...]
+ *   -d : decompress
+ *   -f : compress with Z_FILTERED
+ *   -h : compress with Z_HUFFMAN_ONLY
+ *   -1 to -9 : compression level
  */
 
 int main(argc, argv)
@@ -210,15 +215,26 @@ int main(argc, argv)
 {
     int uncompr = 0;
     gzFile file;
+    char outmode[20];
+
+    strcpy(outmode, "wb6 ");
 
     prog = argv[0];
     argc--, argv++;
 
-    if (argc > 0) {
-        uncompr = (strcmp(*argv, "-d") == 0);
-        if (uncompr) {
-            argc--, argv++;
-        }
+    while (argc > 0) {
+      if (strcmp(*argv, "-d") == 0)
+	uncompr = 1;
+      else if (strcmp(*argv, "-f") == 0)
+	outmode[3] = 'f';
+      else if (strcmp(*argv, "-h") == 0)
+	outmode[3] = 'h';
+      else if ((*argv)[0] == '-' && (*argv)[1] >= '1' && (*argv)[1] <= '9' &&
+	       (*argv)[2] == 0)
+	outmode[2] = (*argv)[1];
+      else
+	break;
+      argc--, argv++;
     }
     if (argc == 0) {
         SET_BINARY_MODE(stdin);
@@ -228,7 +244,7 @@ int main(argc, argv)
             if (file == NULL) error("can't gzdopen stdin");
             gz_uncompress(file, stdout);
         } else {
-            file = gzdopen(fileno(stdout), "wb"); /* "wb9" for max compr. */
+            file = gzdopen(fileno(stdout), outmode);
             if (file == NULL) error("can't gzdopen stdout");
             gz_compress(stdin, file);
         }

Makefile.msc → msdos/Makefile.msc

@@ -15,7 +15,7 @@ CFLAGS=-Oait -Gs -nologo -W3 $(MODEL)
 #-Ox generates bad code with MSC 5.1
 CC=cl
 LD=link
-LDFLAGS=/e/st:0x1000/noe
+LDFLAGS=/e/st:0x1500/noe
 O=.obj
 
 # variables

zlib.rc → msdos/zlib.rc

@@ -2,8 +2,8 @@
 
 #define IDR_VERSION1  1
 IDR_VERSION1	VERSIONINFO	MOVEABLE IMPURE LOADONCALL DISCARDABLE
-  FILEVERSION	 1,0,5,0
-  PRODUCTVERSION 1,0,5,0
+  FILEVERSION	 1,0,7,0
+  PRODUCTVERSION 1,0,7,0
   FILEFLAGSMASK	VS_FFI_FILEFLAGSMASK
   FILEFLAGS	0
   FILEOS	VOS_DOS_WINDOWS32
@@ -17,12 +17,12 @@ BEGIN
 
     BEGIN
       VALUE "FileDescription", "zlib data compression library\0"
-      VALUE "FileVersion",	"1.0.5\0"
+      VALUE "FileVersion",	"1.0.7\0"
       VALUE "InternalName",	"zlib\0"
       VALUE "OriginalFilename",	"zlib.lib\0"
       VALUE "ProductName",	"ZLib.DLL\0"
-      VALUE "Comments",	"DLL support by Alessandro Iacopetti\0"
-      VALUE "LegalCopyright", "(C) 1995-1996 Jean-loup Gailly & Mark Adler\0"
+      VALUE "Comments","DLL support by Alessandro Iacopetti & Gilles Vollant\0"
+      VALUE "LegalCopyright", "(C) 1995-1998 Jean-loup Gailly & Mark Adler\0"
     END
   END
   BLOCK "VarFileInfo"