zlib 0.99

56bcb184 · Mark Adler · 25e53255 · 56bcb184 · 56bcb184 · 56bcb184
33 changed file
--- a/ChangeLog
+++ b/ChangeLog
 		ChangeLog file for zlib
+Changes in 1.0 (15 Jan 96)
+- allow preset dictionary shared between compressor and decompressor
+- allow compression level 0 (no compression)
+- add deflateParams in zlib.h: allow dynamic change of compression level
+  and compression strategy.
+- test large buffers and deflateParams in example.c
+- add optional "configure" to build zlib as a shared library
+- suppress Makefile.qnx, use configure instead
+- fixed deflate for 64-bit systems (detected on Cray)
+- fixed inflate_blocks for 64-bit systems (detected on Alpha)
+- declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
+- always return Z_BUF_ERROR when deflate() has nothing to do
+- deflateInit and inflateInit are now macros to allow version checking
+- prefix all global functions and types with z_ with -DZ_PREFIX
+- make falloc completely reentrant (inftrees.c)
+- fixed very unlikely race condition in ct_static_init
+- free in reverse order of allocation to help memory manager
+- use zlib-1.0/* instead of zlib/* inside the tar.gz
+- make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
+  -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
+- allow gzread on concatenated .gz files
+- deflateEnd now returns Z_DATA_ERROR if it was premature
+- deflate is finally (?) fully deterministic (no matches beyond end of input)
+- Document Z_SYNC_FLUSH
+- add uninstall in Makefile
+- Check for __cpluplus in zlib.h
+- Better test in ct_align for partial flush
+- avoid harmless warnings for Borland C++
+- initialize hash_head in deflate.c
+- avoid warning on fdopen (gzio.c) for HP cc -Aa
+- include stdlib.h for STDC compilers
+- include errno.h for Cray
+- ignore error if ranlib doesn't exist
+- call ranlib twice for NeXTSTEP
+- use exec_prefix instead of prefix for libz.a
+- renamed ct_* as _tr_* to avoid conflict with applications
+- clear z->msg in inflateInit2 before any error return
+- initialize opaque in example.c, gzio.c, deflate.c and inflate.c
+- fixed typo in zconf.h (_GNUC__ => __GNUC__)
+- check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
+- fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
+- in fcalloc, normalize pointer if size > 65520 bytes
+- don't use special fcalloc for 32 bit Borland C++
+- use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
+- use Z_BINARY instead of BINARY
+- document that gzclose after gzdopen will close the file
+- allow "a" as mode in gzopen.
+- fix error checking in gzread
+- allow skipping .gz extra-field on pipes
+- added reference to Perl interface in README
+- put the crc table in FAR data (I dislike more and more the medium model :)
+- added get_crc_table
+- added a dimension to all arrays (Borland C can't count).
+- workaround Borland C bug in declaration of inflate_codes_new & inflate_fast
+- guard against multiple inclusion of *.h (for precompiled header on Mac)
+- Watcom C pretends to be Microsoft C small model even in 32 bit mode.
+- don't use unsized arrays to avoid silly warnings by Visual C++:
+     warning C4746: 'inflate_mask' : unsized array treated as  '__far'
+     (what's wrong with far data in far model?).
+- define enum out of inflate_blocks_state to allow compilation with C++
 Changes in 0.95 (16 Aug 95)
 - fix MSDOS small and medium model (now easier to adapt to any compiler)
 - inlined send_bits

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

--- a/Makefile
+++ b/Makefile
 # Makefile for zlib
-# Copyright (C) 1995 Jean-loup Gailly.
+# Copyright (C) 1995-1996 Jean-loup Gailly.
 # For conditions of distribution and use, see copyright notice in zlib.h 
+# To compile and test, type:
+#   ./configure; make test
+# The call of configure is optional if you don't have special requirements
+# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
+#    make install
+# To install in $HOME instead of /usr/local, use:
+#    make install prefix=$HOME
 CC=cc
 CFLAGS=-O
-#use -O3 for gcc to take advantage of inlining
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
-#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
 #CFLAGS=-g -DDEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
 LDFLAGS=-L. -lz
+LDSHARED=$(CC)
+VER=1.0
+LIBS=libz.a
+AR=ar rc
 RANLIB=ranlib
+TAR=tar
 prefix=/usr/local
+exec_prefix = $(prefix)
 OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
 TEST_OBJS = example.o minigzip.o
+DISTFILES = README ChangeLog configure Makefile.in Makefile Makefile.msc \
+	    Makefile.bor Makefile.tc Make_vms.com descrip.mms *.[ch]
 all: example minigzip
 test: all
 	./example
 	echo hello world | ./minigzip | ./minigzip -d 
-install: libz.a
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp zlib.h zconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
-	cp libz.a $(prefix)/lib
-	chmod 644 $(prefix)/lib/libz.a
 libz.a: $(OBJS)
-	ar rc $@ $(OBJS)
+	$(AR) $@ $(OBJS)
-	$(RANLIB) $@
+	-@ ($(RANLIB) $@ || true) 2>/dev/null
-example: example.o libz.a
+libz.so.$(VER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f libz.so; ln -s $@ libz.so
+example: example.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
-minigzip: minigzip.o libz.a
+minigzip: minigzip.o $(LIBS)
 	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
+install: $(LIBS)
+	-@if [ ! $(prefix)/include  ]; then mkdir $(prefix)/include; fi
+	-@if [ ! $(exec_prefix)/lib ]; then mkdir $(exec_prefix)/lib; fi
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp $(LIBS) $(exec_prefix)/lib
+	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
+	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
+	cd $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
+	  ln -s libz.so.$(VER) libz.so; \
+	fi
+# The ranlib in install is needed on NeXTSTEP which checks file times
+uninstall:
+	cd $(exec_prefix)/lib; rm -f $(LIBS); \
+	if test -f libz.so; then \
+	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	 rm -f libz.so.$$v libz.so; \
+	fi
+	cd $(prefix)/include; rm -f zlib.h zconf.h
 clean:
-	rm -f *.o example minigzip libz.a foo.gz
+	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
 zip:
-	zip -ul9 zlib README ChangeLog Makefile Make????.??? Makefile.?? \
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
-	  descrip.mms *.[ch]
+	v=`sed -n -e 's/\./-/' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	zip -ul9 zlib-$$v $(DISTFILES)
-tgz:
+	mv Makefile~ Makefile
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-	  zlib/Make????.??? zlib/Makefile.?? zlib/descrip.mms zlib/*.[ch]
+dist:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	rm -f $$d.tar.gz; \
+	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
+	files=""; \
+	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
+	cd ..; \
+	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
+	if test ! -d $$d; then rm -f $$d; fi
+	mv Makefile~ Makefile
+tags:	
+	etags *.[ch]
+depend:
+	makedepend -- $(CFLAGS) -- *.[ch]
 # DO NOT DELETE THIS LINE -- make depend depends on it.
-adler32.o: zutil.h zlib.h zconf.h
+adler32.o: zlib.h zconf.h
 compress.o: zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h
+crc32.o: zlib.h zconf.h
 deflate.o: deflate.h zutil.h zlib.h zconf.h
 example.o: zlib.h zconf.h
 gzio.o: zutil.h zlib.h zconf.h
-infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
+infcodes.o: zutil.h zlib.h zconf.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
+infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h
+inffast.o: infblock.h infcodes.h infutil.h inffast.h
 inflate.o: zutil.h zlib.h zconf.h infblock.h
 inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
+infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-minigzip.o: zlib.h zconf.h
+minigzip.o:  zlib.h zconf.h 
-trees.o: deflate.h zutil.h zlib.h zconf.h
+trees.o: deflate.h zutil.h zlib.h zconf.h 
 uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h  
--- a/Makefile.bor
+++ b/Makefile.bor
@@ -18,7 +18,7 @@ CFLAGS=-O2 -Z $(MODEL)
 CC=bcc
 LD=bcc
 LIB=tlib
-#   replace bcc with tcc for Turbo C++ 1.0
+#   replace bcc with tcc for Turbo C++ 1.0, with bcc32 for the 32 bit version
 LDFLAGS=$(MODEL)
 O=.obj

--- a/Makefile.in
+++ b/Makefile.in
+# Makefile for zlib
+# Copyright (C) 1995-1996 Jean-loup Gailly.
+# For conditions of distribution and use, see copyright notice in zlib.h 
+# To compile and test, type:
+#   ./configure; make test
+# The call of configure is optional if you don't have special requirements
+# To install /usr/local/lib/libz.* and /usr/local/include/zlib.h, type:
+#    make install
+# To install in $HOME instead of /usr/local, use:
+#    make install prefix=$HOME
+CC=cc
+CFLAGS=-O
+#CFLAGS=-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7
+#CFLAGS=-g -DDEBUG
+#CFLAGS=-O3 -Wall -Wwrite-strings -Wpointer-arith -Wconversion \
+#           -Wstrict-prototypes -Wmissing-prototypes
+LDFLAGS=-L. -lz
+LDSHARED=$(CC)
+VER=1.0
+LIBS=libz.a
+AR=ar rc
+RANLIB=ranlib
+TAR=tar
+prefix=/usr/local
+exec_prefix = $(prefix)
+OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
+       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
+TEST_OBJS = example.o minigzip.o
+DISTFILES = README ChangeLog configure Makefile.in Makefile Makefile.msc \
+	    Makefile.bor Makefile.tc Make_vms.com descrip.mms *.[ch]
+all: example minigzip
+test: all
+	./example
+	echo hello world | ./minigzip | ./minigzip -d 
+libz.a: $(OBJS)
+	$(AR) $@ $(OBJS)
+	-@ ($(RANLIB) $@ || true) 2>/dev/null
+libz.so.$(VER): $(OBJS)
+	$(LDSHARED) -o $@ $(OBJS)
+	rm -f libz.so; ln -s $@ libz.so
+example: example.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
+minigzip: minigzip.o $(LIBS)
+	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
+install: $(LIBS)
+	-@if [ ! $(prefix)/include  ]; then mkdir $(prefix)/include; fi
+	-@if [ ! $(exec_prefix)/lib ]; then mkdir $(exec_prefix)/lib; fi
+	cp zlib.h zconf.h $(prefix)/include
+	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
+	cp $(LIBS) $(exec_prefix)/lib
+	cd $(exec_prefix)/lib; chmod 644 $(LIBS)
+	-@(cd $(exec_prefix)/lib; $(RANLIB) libz.a || true) >/dev/null 2>&1
+	cd $(exec_prefix)/lib; if test -f libz.so.$(VER); then \
+	  ln -s libz.so.$(VER) libz.so; \
+	fi
+# The ranlib in install is needed on NeXTSTEP which checks file times
+uninstall:
+	cd $(exec_prefix)/lib; rm -f $(LIBS); \
+	if test -f libz.so; then \
+	 v=`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p'<$(prefix)/include/zlib.h`;\
+	 rm -f libz.so.$$v libz.so; \
+	fi
+	cd $(prefix)/include; rm -f zlib.h zconf.h
+clean:
+	rm -f *.o *~ example minigzip libz.a libz.so* foo.gz
+zip:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	v=`sed -n -e 's/\./-/' -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	zip -ul9 zlib-$$v $(DISTFILES)
+	mv Makefile~ Makefile
+dist:
+	mv Makefile Makefile~; cp -p Makefile.in Makefile
+	d=zlib-`sed -n '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`;\
+	rm -f $$d.tar.gz; \
+	if test ! -d ../$$d; then rm -f ../$$d; ln -s `pwd` ../$$d; fi; \
+	files=""; \
+	for f in $(DISTFILES); do files="$$files $$d/$$f"; done; \
+	cd ..; \
+	GZIP=-9 $(TAR) chofz $$d/$$d.tar.gz $$files; \
+	if test ! -d $$d; then rm -f $$d; fi
+	mv Makefile~ Makefile
+tags:	
+	etags *.[ch]
+depend:
+	makedepend -- $(CFLAGS) -- *.[ch]
+# DO NOT DELETE THIS LINE -- make depend depends on it.
+adler32.o: zlib.h zconf.h
+compress.o: zlib.h zconf.h
+crc32.o: zlib.h zconf.h
+deflate.o: deflate.h zutil.h zlib.h zconf.h
+example.o: zlib.h zconf.h
+gzio.o: zutil.h zlib.h zconf.h
+infblock.o: infblock.h inftrees.h infcodes.h infutil.h zutil.h zlib.h zconf.h
+infcodes.o: zutil.h zlib.h zconf.h
+infcodes.o: inftrees.h infblock.h infcodes.h infutil.h inffast.h
+inffast.o: zutil.h zlib.h zconf.h inftrees.h
+inffast.o: infblock.h infcodes.h infutil.h inffast.h
+inflate.o: zutil.h zlib.h zconf.h infblock.h
+inftrees.o: zutil.h zlib.h zconf.h inftrees.h
+infutil.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
+minigzip.o:  zlib.h zconf.h 
+trees.o: deflate.h zutil.h zlib.h zconf.h 
+uncompr.o: zlib.h zconf.h
+zutil.o: zutil.h zlib.h zconf.h  
--- a/Makefile.qnx
+++ b/Makefile.qnx
-# Makefile for zlib
-# Copyright (C) 1995 Jean-loup Gailly.
-# For conditions of distribution and use, see copyright notice in zlib.h 
-# Modified slightly for QNX by Chris Herborth (chrish@qnx.com)
-CC=cc
-CFLAGS=-4 -O -Q
-#use -O3 for gcc to take advantage of inlining
-#CFLAGS="-O -DMAX_WBITS=14 -DMAX_MEM_LEVEL=7"
-#CFLAGS=-g -DDEBUG
-LDFLAGS=-L. -lz
-#RANLIB=ranlib
-prefix=/usr/local
-OBJS = adler32.o compress.o crc32.o gzio.o uncompr.o deflate.o trees.o \
-       zutil.o inflate.o infblock.o inftrees.o infcodes.o infutil.o inffast.o
-TEST_OBJS = example.o minigzip.o
-all: example minigzip
-test: all
-	./example
-	echo hello world | ./minigzip | ./minigzip -d 
-install: zlib.lib
-	-@mkdir $(prefix)/include
-	-@mkdir $(prefix)/lib
-	cp zlib.h zconf.h $(prefix)/include
-	chmod 644 $(prefix)/include/zlib.h $(prefix)/include/zconf.h
-	cp zlib.lib $(prefix)/lib
-	chmod 644 $(prefix)/lib/zlib.lib
-zlib.lib: $(OBJS)
-	cc -A $@ $(OBJS)
-#	ar rc $@ $(OBJS)
-#	$(RANLIB) $@
-example: example.o zlib.lib
-	$(CC) $(CFLAGS) -o $@ example.o $(LDFLAGS)
-minigzip: minigzip.o zlib.lib
-	$(CC) $(CFLAGS) -o $@ minigzip.o $(LDFLAGS)
-clean:
-	rm -f *.o example minigzip zlib.lib foo.gz
-zip:
-	zip -ul9 zlib README ChangeLog Makefile Makefile.??? Makefile.?? *.[ch]
-tgz:
-	cd ..; tar cfz zlib/zlib.tgz zlib/README zlib/ChangeLog zlib/Makefile \
-		zlib/Makefile.??? zlib/Makefile.?? zlib/*.[ch]
-# DO NOT DELETE THIS LINE -- make depend depends on it.
-adler32.o: zutil.h zlib.h zconf.h
-compress.o: zlib.h zconf.h
-crc32.o: zutil.h zlib.h zconf.h
-deflate.o: deflate.h zutil.h zlib.h zconf.h
-example.o: zlib.h zconf.h
-gzio.o: zutil.h zlib.h zconf.h
-infblock.o: zutil.h zlib.h zconf.h infblock.h inftrees.h infcodes.h infutil.h
-infcodes.o: zutil.h zlib.h zconf.h inftrees.h infutil.h infcodes.h inffast.h
-inffast.o: zutil.h zlib.h zconf.h inftrees.h infutil.h inffast.h
-inflate.o: zutil.h zlib.h zconf.h infblock.h
-inftrees.o: zutil.h zlib.h zconf.h inftrees.h
-infutil.o: zutil.h zlib.h zconf.h inftrees.h infutil.h
-minigzip.o: zlib.h zconf.h
-trees.o: deflate.h zutil.h zlib.h zconf.h
-uncompr.o: zlib.h zconf.h
-zutil.o: zutil.h zlib.h zconf.h
--- a/README
+++ b/README
-zlib 0.95 is a beta version of a general purpose compression library.
+zlib 1.0 is a general purpose data compression library.  All the code
-This should be the last version before the first official
+is reentrant (thread safe).  The data format used by the zlib library
-version (1.0), so please test it now. (At least compile and run it with
+is described in the files zlib-3.3.doc, deflate-1.3.doc and
-"make test"). This version has no known bugs.
+gzip-4.3.doc, available in ftp://ftp.uu.net/pub/archiving/zip/doc/
-The data format used by the zlib library is described in the
-files zlib-3.1.doc, deflate-1.1.doc and gzip-4.1.doc, available
-in ftp.uu.net:/pub/archiving/zip/doc.
 All functions of the compression library are documented in the file
 zlib.h. A usage example of the library is given in the file example.c
 which also tests that the library is working correctly. Another
-example is given in the file minigzip.c.
+example is given in the file minigzip.c. The compression library itself
+is composed of all source files except example.c and minigzip.c.
-To compile all files and run the test program, just type: make test
-(For MSDOS, use one of the special makefiles such as Makefile.msc;
+To compile all files and run the test program, follow the instructions
-for VMS, use Make_vms.com or descrip.mms.)
+given at the top of Makefile. In short "make test; make install"
-To install the zlib library (libz.a) in /usr/local/lib, type: make install
+should work for most machines.  For MSDOS, use one of the special
-To install in a different directory, use for example:
+makefiles such as Makefile.msc; for VMS, use Make_vms.com or descrip.mms.
-  make install prefix=$HOME
-This will install in $HOME/lib instead of /usr/local/lib.
+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 changes made in version 0.95 are documented in the file ChangeLog.
-The main changes since 0.94 are:
+The changes made in version 1.0 are documented in the file ChangeLog.
- fix MSDOS small and medium model (now easier to adapt to any compiler)
+The main changes since 0.95 are:
- inlined send_bits
+- allow preset dictionary shared between compressor and decompressor
- fix the final (:-) bug for deflate with flush (output was correct but
+- allow compression level 0 (no compression)
-  not completely flushed in rare occasions).
+- add deflateParams in zlib.h: allow dynamic change of compression level
+  and compression strategy.
-For MSDOS, the small and medium models have been tested only with Microsoft C.
+- test large buffers and deflateParams in example.c
-(This should now work for Borland C also, but I don't have a recent Borland
+- add optional "configure" to build zlib as a shared library
-compiler to test with.) The small model was tested with Turbo C but only with
+- suppress Makefile.qnx, use configure instead
-reduced performance to avoid any far allocation; it was tested with
+- fixes for 64-bit systems (needed for Alpha and Cray)
- -DMAX_WBITS=11 -DMAX_MEM_LEVEL=3
+- declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
+- always return Z_BUF_ERROR when deflate() has nothing to do
+- deflateInit and inflateInit are now macros to allow version checking
- (C) 1995 Jean-loup Gailly and Mark Adler
+- prefix all global functions and types with z_ with -DZ_PREFIX
+- fix some very unlikely race conditions in multi-threaded environment
+- several minor fixes for better portability
+- free in reverse order of allocation to help memory manager
+- use zlib-1.0/* instead of zlib/* inside the tar.gz
+- make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
+  -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
+- allow gzread on concatenated .gz files
+- deflateEnd now returns Z_DATA_ERROR if it was premature
+- deflate is finally (?) fully deterministic
+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
+- For 64-bit Iris, 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).
+- zlib doesn't work with gcc 2.6.3 on a DEC 3000/300LX under OSF/1 2.1   
+  it works when compiled with cc.
+- zlib doesn't work on HP-UX 9.05 with one cc compiler (the one not
+  accepting the -O option). It works with the other cc compiler.
+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*
+Acknowledgments:
+  The deflate format used by zlib was defined by Phil Katz. The deflate
+  and zlib specifications were written by Peter Deutsch. Thanks to all the
+  people who reported problems and suggested various improvements in zlib;
+  they are too numerous to cite here.
+Copyright notice:
+ (C) 1995-1996 Jean-loup Gailly and Mark Adler
  This software is provided 'as-is', without any express or implied
  warranty.  In no event will the authors be held liable for any damages

--- a/adler32.c
+++ b/adler32.c
 /* adler32.c -- compute the Adler-32 checksum of a data stream
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -20,7 +20,7 @@
 /* ========================================================================= */
 uLong adler32(adler, buf, len)
    uLong adler;
-    Bytef *buf;
+    const Bytef *buf;
    uInt len;
 {
    unsigned long s1 = adler & 0xffff;

--- a/compress.c
+++ b/compress.c
 /* compress.c -- compress a memory buffer
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -22,13 +22,13 @@
 int compress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
-    Bytef *source;
+    const Bytef *source;
    uLong sourceLen;
 {
    z_stream stream;
    int err;
-    stream.next_in = source;
+    stream.next_in = (Bytef*)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
@@ -39,6 +39,7 @@ int compress (dest, destLen, source, sourceLen)
    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;
+    stream.opaque = (voidpf)0;
    err = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
    if (err != Z_OK) return err;

--- a/configure
+++ b/configure
+#!/bin/sh
+# configure script for zlib. This script is needed only if
+# you wish to build a shared library and your system supports them,
+# of if you need special compiler, flags or install directory.
+# Otherwise, you can just use directly "make test; make install"
+#
+# To impose specific compiler or flags or install directory, use for example:
+#    prefix=$HOME CC=cc CFLAGS="-O4" ./configure
+# or for csh/tcsh users:
+#    (setenv prefix $HOME; setenv CC cc; setenv CFLAGS "-O4"; ./configure)
+# LDSHARED is the command to be used to create a shared library
+LIBS=libz.a
+VER=`sed -n -e '/VERSION "/s/.*"\(.*\)".*/\1/p' < zlib.h`
+AR=${AR-"ar rc"}
+prefix=${prefix-/usr/local}
+exec_prefix=${exec_prefix-$prefix}
+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 $test.c) 2>/dev/null; then
+  CC=gcc
+  SFLAGS=${CFLAGS-"-fPIC -O3"}
+  CFLAGS=${CFLAGS-"-O3"}
+  LDSHARED=${LDSHARED-"gcc -shared"}
+else
+  # find system name and corresponding cc options
+  CC=${CC-cc}
+  case `(uname -sr || echo unknown) 2>/dev/null` in
+  SunOS\ 5*) SFLAGS=${CFLAGS-"-fast -xcg89 -KPIC -R."}
+             CFLAGS=${CFLAGS-"-fast -xcg89"}
+	     LDSHARED=${LDSHARED-"cc -G"};;
+  SunOS\ 4*) SFLAGS=${CFLAGS-"-O2 -PIC"}
+	     CFLAGS=${CFLAGS-"-O2"}
+	     LDSHARED=${LDSHARED-"ld"};;
+  IRIX*)     SFLAGS=${CFLAGS-"-O2 -rpath ."}
+	     CFLAGS=${CFLAGS-"-O2"}
+	     LDSHARED=${LDSHARED-"cc -shared"};;
+  QNX*)      SFLAGS=${CFLAGS-"-4 -O -Q"}
+             CFLAGS=${CFLAGS-"-4 -O -Q"}
+	     LDSHARED=${LDSHARED-"cc"}
+             LIBS=zlib.lib
+             AR="cc -A";;
+  # send working options for other systems to gzip@prep.ai.mit.edu
+  *)         SFLAGS=${CFLAGS-"-O"}
+	     CFLAGS=${CFLAGS-"-O"}
+	     LDSHARED=${LDSHARED-"-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 $CC.
+else
+  LDSHARED="$CC"
+  echo Building static library $LIBS version $VER with $CC.
+fi
+rm -f $test.[co] $test.so
+# udpate Makefile
+# ed -s Makefile <<EOF
+sed < Makefile.in "
+/^CC *=/s/=.*/=$CC/
+/^CFLAGS *=/s/=.*/=$CFLAGS/
+/^LDSHARED *=/s/=.*/=$LDSHARED/
+/^LIBS *=/s,=.*,=$LIBS,
+/^AR *=/s/=.*/=$AR/
+/^VER *=/s/=.*/=$VER/
+/^prefix *=/s,=.*,=$prefix,
+/^exec_prefix *=/s,=.*,=$exec_prefix,
+" > Makefile
+#w
+#q
+#EOF
--- a/crc32.c
+++ b/crc32.c
 /* crc32.c -- compute the CRC-32 of a data stream
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -10,23 +10,53 @@
 #define local static
 #ifdef DYNAMIC_CRC_TABLE
-/* =========================================================================
- * Make the crc table. This function is needed only if you want to compute
- * the table dynamically.
- */
 local int crc_table_empty = 1;
-local uLong crc_table[256];
+local uLongf crc_table[256];
+local void make_crc_table OF((void));
+/*
+  Generate a table for a byte-wise 32-bit CRC calculation on the polynomial:
+  x^32+x^26+x^23+x^22+x^16+x^12+x^11+x^10+x^8+x^7+x^5+x^4+x^2+x+1.
+  Polynomials over GF(2) are represented in binary, one bit per coefficient,
+  with the lowest powers in the most significant bit.  Then adding polynomials
+  is just exclusive-or, and multiplying a polynomial by x is a right shift by
+  one.  If we call the above polynomial p, and represent a byte as the
+  polynomial q, also with the lowest power in the most significant bit (so the
+  byte 0xb1 is the polynomial x^7+x^3+x+1), then the CRC is (q*x^32) mod p,
+  where a mod b means the remainder after dividing a by b.
+  This calculation is done using the shift-register method of multiplying and
+  taking the remainder.  The register is initialized to zero, and for each
+  incoming bit, x^32 is added mod p to the register if the bit is a one (where
+  x^32 mod p is p+x^32 = x^26+...+1), and the register is multiplied mod p by
+  x (which is shifting right by one and adding x^32 mod p if the bit shifted
+  out is a one).  We start with the highest power (least significant bit) of
+  q and repeat for all eight bits of q.
+  The table is simply the CRC of all possible eight bit values.  This is all
+  the information needed to generate CRC's on data a byte at a time for all
+  combinations of CRC register values and incoming bytes.
+*/
 local void make_crc_table()
 {
  uLong c;
  int n, k;
+  uLong poly;            /* polynomial exclusive-or pattern */
+  /* terms of polynomial defining this crc (except x^32): */
+  static Byte p[] = {0,1,2,4,5,7,8,10,11,12,16,22,23,26};
+  /* make exclusive-or pattern from polynomial (0xedb88320L) */
+  poly = 0L;
+  for (n = 0; n < sizeof(p)/sizeof(Byte); n++)
+    poly |= 1L << (31 - p[n]);
  for (n = 0; n < 256; n++)
  {
    c = (uLong)n;
    for (k = 0; k < 8; k++)
-      c = c & 1 ? 0xedb88320L ^ (c >> 1) : c >> 1;
+      c = c & 1 ? poly ^ (c >> 1) : c >> 1;
    crc_table[n] = c;
  }
  crc_table_empty = 0;
@@ -35,7 +65,7 @@ local void make_crc_table()
 /* ========================================================================
 * Table of CRC-32's of all single-byte values (made by make_crc_table)
 */
-local uLong crc_table[] = {
+local uLongf crc_table[256] = {
  0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
  0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
  0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
@@ -91,6 +121,18 @@ local uLong crc_table[] = {
 };
 #endif
+/* =========================================================================
+ * This function can be used by asm versions of crc32()
+ */
+uLongf *get_crc_table()
+{
+#ifdef DYNAMIC_CRC_TABLE
+  if (crc_table_empty) make_crc_table();
+#endif
+  return (uLongf *)crc_table;
+}
+/* ========================================================================= */
 #define DO1(buf) crc = crc_table[((int)crc ^ (*buf++)) & 0xff] ^ (crc >> 8);
 #define DO2(buf)  DO1(buf); DO1(buf);
 #define DO4(buf)  DO2(buf); DO2(buf);
@@ -99,7 +141,7 @@ local uLong crc_table[] = {
 /* ========================================================================= */
 uLong crc32(crc, buf, len)
    uLong crc;
-    Bytef *buf;
+    const Bytef *buf;
    uInt len;
 {
    if (buf == Z_NULL) return 0L;

--- a/deflate.c
+++ b/deflate.c
--- a/deflate.h
+++ b/deflate.h
 /* deflate.h -- internal compression state
- * Copyright (C) 1995 Jean-loup Gailly
+ * Copyright (C) 1995-1996 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -10,17 +10,15 @@
 /* $Id: deflate.h,v 1.5 1995/05/03 17:27:09 jloup Exp $ */
+#ifndef _DEFLATE_H
+#define _DEFLATE_H
 #include "zutil.h"
 /* ===========================================================================
 * Internal compression state.
 */
-/* Data type */
-#define BINARY  0
-#define ASCII   1
-#define UNKNOWN 2
 #define LENGTH_CODES 29
 /* number of length codes, not counting the special END_BLOCK code */
@@ -87,10 +85,10 @@ typedef struct internal_state {
    Bytef *pending_buf;  /* output still pending */
    Bytef *pending_out;  /* next pending byte to output to the stream */
    int   pending;       /* nb of bytes in the pending buffer */
-    uLong adler;         /* adler32 of uncompressed data */
    int   noheader;      /* suppress zlib header and adler32 */
    Byte  data_type;     /* UNKNOWN, BINARY or ASCII */
    Byte  method;        /* STORED (for zip only) or DEFLATED */
+    int   last_flush;    /* value of flush param for previous deflate call */
                /* used by deflate.c: */
@@ -173,7 +171,7 @@ typedef struct internal_state {
    uInt good_match;
    /* Use a faster search when the previous match is longer than this */
-     int nice_match; /* Stop searching when current match exceeds this */
+    int nice_match; /* Stop searching when current match exceeds this */
                /* used by trees.c: */
    /* Didn't use ct_data typedef below to supress compiler warning */
@@ -267,9 +265,11 @@ typedef struct internal_state {
 */
        /* in trees.c */
-void ct_init       OF((deflate_state *s));
+void _tr_init         OF((deflate_state *s));
-int  ct_tally      OF((deflate_state *s, int dist, int lc));
+int  _tr_tally        OF((deflate_state *s, unsigned dist, unsigned lc));
-ulg ct_flush_block OF((deflate_state *s, charf *buf, ulg stored_len, int eof));
+ulg  _tr_flush_block  OF((deflate_state *s, charf *buf, ulg stored_len,
-void ct_align      OF((deflate_state *s));
+			  int eof));
-void ct_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
+void _tr_align        OF((deflate_state *s));
+void _tr_stored_block OF((deflate_state *s, charf *buf, ulg stored_len,
                          int eof));
+#endif
--- a/example.c
+++ b/example.c
 /* example.c -- usage example of the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -10,20 +10,11 @@
 #ifdef STDC
 #  include <string.h>
+#  include <stdlib.h>
+#else
+   extern void exit  OF((int));
 #endif
-#ifndef __GO32__
-extern void exit  OF((int));
-#endif
-#define BUFLEN 4096
-#define local static
-/* For MSDOS and other systems with limitation on stack size. For Unix,
-    #define local
-   works also.
- */
 #define CHECK_ERR(err, msg) { \
    if (err != Z_OK) { \
        fprintf(stderr, "%s error: %d\n", msg, err); \
@@ -31,32 +22,44 @@ extern void exit  OF((int));
    } \
 }
-char *hello = "hello, hello!";
+const char hello[] = "hello, hello!";
 /* "hello world" would be more standard, but the repeated "hello"
 * stresses the compression code better, sorry...
 */
-void test_compress OF((void));
+const char dictionary[] = "hello";
-void test_gzio     OF((char *out, char *in));
+uLong dictId; /* Adler32 value of the dictionary */
-void test_deflate  OF((Byte compr[]));
-void test_inflate  OF((Byte compr[]));
+void test_compress      OF((Bytef *compr, uLong comprLen,
-void test_flush    OF((Byte compr[]));
+		            Bytef *uncompr, uLong uncomprLen));
-void test_sync     OF((Byte compr[]));
+void test_gzio          OF((const char *out, const char *in, 
-int  main          OF((int argc, char *argv[]));
+		            Bytef *uncompr, int uncomprLen));
+void test_deflate       OF((Bytef *compr, uLong comprLen));
+void test_inflate       OF((Bytef *compr, uLong comprLen,
+		            Bytef *uncompr, uLong uncomprLen));
+void test_large_deflate OF((Bytef *compr, uLong comprLen,
+		            Bytef *uncompr, uLong uncomprLen));
+void test_large_inflate OF((Bytef *compr, uLong comprLen,
+		            Bytef *uncompr, uLong uncomprLen));
+void test_flush         OF((Bytef *compr, uLong comprLen));
+void test_sync          OF((Bytef *compr, uLong comprLen,
+		            Bytef *uncompr, uLong uncomprLen));
+void test_dict_deflate  OF((Bytef *compr, uLong comprLen));
+void test_dict_inflate  OF((Bytef *compr, uLong comprLen,
+		            Bytef *uncompr, uLong uncomprLen));
+int  main               OF((int argc, char *argv[]));
 /* ===========================================================================
 * Test compress() and uncompress()
 */
-void test_compress()
+void test_compress(compr, comprLen, uncompr, uncomprLen)
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte compr[BUFLEN];
-    uLong comprLen = sizeof(compr);
-    local Byte uncompr[BUFLEN];
-    uLong uncomprLen = sizeof(uncompr);
    int err;
    uLong len = strlen(hello)+1;
-    err = compress(compr, &comprLen, (Byte*)hello, len);
+    err = compress(compr, &comprLen, (const Bytef*)hello, len);
    CHECK_ERR(err, "compress");
    strcpy((char*)uncompr, "garbage");
@@ -74,12 +77,12 @@ void test_compress()
 /* ===========================================================================
 * Test read/write of .gz files
 */
-void test_gzio(out, in)
+void test_gzio(out, in, uncompr, uncomprLen)
-    char *out; /* output file */
+    const char *out; /* output file */
-    char *in;  /* input file */
+    const char *in;  /* input file */
+    Bytef *uncompr;
+    int  uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
-    int uncomprLen = sizeof(uncompr);
    int err;
    int len = strlen(hello)+1;
    gzFile file;
@@ -90,7 +93,7 @@ void test_gzio(out, in)
        exit(1);
    }
-    if (gzwrite(file, hello, len) != len) {
+    if (gzwrite(file, (const voidp)hello, (unsigned)len) != len) {
        fprintf(stderr, "gzwrite err: %s\n", gzerror(file, &err));
    }
    gzclose(file);
@@ -101,7 +104,7 @@ void test_gzio(out, in)
    }
    strcpy((char*)uncompr, "garbage");
-    uncomprLen = gzread(file, uncompr, uncomprLen);
+    uncomprLen = gzread(file, uncompr, (unsigned)uncomprLen);
    if (uncomprLen != len) {
        fprintf(stderr, "gzread err: %s\n", gzerror(file, &err));
    }
@@ -117,8 +120,9 @@ void test_gzio(out, in)
 /* ===========================================================================
 * Test deflate() with small buffers
 */
-void test_deflate(compr)
+void test_deflate(compr, comprLen)
-    Byte compr[];
+    Bytef *compr;
+    uLong comprLen;
 {
    z_stream c_stream; /* compression stream */
    int err;
@@ -126,14 +130,15 @@ void test_deflate(compr)
    c_stream.zalloc = (alloc_func)0;
    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
    err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
    CHECK_ERR(err, "deflateInit");
-    c_stream.next_in  = (Byte*)hello;
+    c_stream.next_in  = (Bytef*)hello;
    c_stream.next_out = compr;
-    while (c_stream.total_in != (uLong)len) {
+    while (c_stream.total_in != (uLong)len && c_stream.total_out < comprLen) {
        c_stream.avail_in = c_stream.avail_out = 1; /* force small buffers */
        err = deflate(&c_stream, Z_NO_FLUSH);
        CHECK_ERR(err, "deflate");
@@ -153,10 +158,10 @@ void test_deflate(compr)
 /* ===========================================================================
 * Test inflate() with small buffers
 */
-void test_inflate(compr)
+void test_inflate(compr, comprLen, uncompr, uncomprLen)
-    Byte compr[];
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
    int err;
    z_stream d_stream; /* decompression stream */
@@ -164,6 +169,7 @@ void test_inflate(compr)
    d_stream.zalloc = (alloc_func)0;
    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
    err = inflateInit(&d_stream);
    CHECK_ERR(err, "inflateInit");
@@ -171,7 +177,7 @@ void test_inflate(compr)
    d_stream.next_in  = compr;
    d_stream.next_out = uncompr;
-    for (;;) {
+    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);
        if (err == Z_STREAM_END) break;
@@ -188,11 +194,105 @@ void test_inflate(compr)
    }
 }
+/* ===========================================================================
+ * Test deflate() with large buffers and dynamic change of compression level
+ */
+void test_large_deflate(compr, comprLen, uncompr, uncomprLen)
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
+    err = deflateInit(&c_stream, Z_BEST_SPEED);
+    CHECK_ERR(err, "deflateInit");
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+    /* At this point, uncompr is still mostly zeroes, so it should compress
+     * very well:
+     */
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+    if (c_stream.avail_in != 0) {
+        fprintf(stderr, "deflate not greedy\n");
+    }
+    /* Feed in already compressed data and switch to no compression: */
+    deflateParams(&c_stream, Z_NO_COMPRESSION, Z_DEFAULT_STRATEGY);
+    c_stream.next_in = compr;
+    c_stream.avail_in = (uInt)comprLen/2;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+    /* Switch back to compressing mode: */
+    deflateParams(&c_stream, Z_BEST_COMPRESSION, Z_FILTERED);
+    c_stream.next_in = uncompr;
+    c_stream.avail_in = (uInt)uncomprLen;
+    err = deflate(&c_stream, Z_NO_FLUSH);
+    CHECK_ERR(err, "deflate");
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+/* ===========================================================================
+ * Test inflate() with large buffers
+ */
+void test_large_inflate(compr, comprLen, uncompr, uncomprLen)
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+    strcpy((char*)uncompr, "garbage");
+    d_stream.zalloc = (alloc_func)0;
+    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+    for (;;) {
+        d_stream.next_out = uncompr;            /* discard the output */
+	d_stream.avail_out = (uInt)uncomprLen;
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+        CHECK_ERR(err, "large inflate");
+    }
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+    if (d_stream.total_out != 2*uncomprLen + comprLen/2) {
+        fprintf(stderr, "bad large inflate: %ld\n", d_stream.total_out);
+    } else {
+        printf("large_inflate(): OK\n");
+    }
+}
 /* ===========================================================================
 * Test deflate() with full flush
 */
-void test_flush(compr)
+void test_flush(compr, comprLen)
-    Byte compr[];
+    Bytef *compr;
+    uLong comprLen;
 {
    z_stream c_stream; /* compression stream */
    int err;
@@ -200,14 +300,15 @@ void test_flush(compr)
    c_stream.zalloc = (alloc_func)0;
    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
    err = deflateInit(&c_stream, Z_DEFAULT_COMPRESSION);
    CHECK_ERR(err, "deflateInit");
-    c_stream.next_in  = (Byte*)hello;
+    c_stream.next_in  = (Bytef*)hello;
    c_stream.next_out = compr;
    c_stream.avail_in = 3;
-    c_stream.avail_out = BUFLEN;
+    c_stream.avail_out = (uInt)comprLen;
    err = deflate(&c_stream, Z_FULL_FLUSH);
    CHECK_ERR(err, "deflate");
@@ -225,10 +326,10 @@ void test_flush(compr)
 /* ===========================================================================
 * Test inflateSync()
 */
-void test_sync(compr)
+void test_sync(compr, comprLen, uncompr, uncomprLen)
-    Byte compr[];
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
 {
-    local Byte uncompr[BUFLEN];
    int err;
    z_stream d_stream; /* decompression stream */
@@ -236,6 +337,7 @@ void test_sync(compr)
    d_stream.zalloc = (alloc_func)0;
    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
    err = inflateInit(&d_stream);
    CHECK_ERR(err, "inflateInit");
@@ -243,13 +345,13 @@ void test_sync(compr)
    d_stream.next_in  = compr;
    d_stream.next_out = uncompr;
    d_stream.avail_in = 2; /* just read the zlib header */
-    d_stream.avail_out = sizeof(uncompr);
+    d_stream.avail_out = (uInt)uncomprLen;
    inflate(&d_stream, Z_NO_FLUSH);
    CHECK_ERR(err, "inflate");
-    d_stream.avail_in = BUFLEN-2; /* let inflate read all compressed data */
+    d_stream.avail_in = (uInt)comprLen-2;   /* read all compressed data */
-    err = inflateSync(&d_stream); /* skip the damaged part */
+    err = inflateSync(&d_stream);           /* but skip the damaged part */
    CHECK_ERR(err, "inflateSync");
    err = inflate(&d_stream, Z_FINISH);
@@ -263,6 +365,91 @@ void test_sync(compr)
    printf("after inflateSync(): hel%s\n", uncompr);
 }
+/* ===========================================================================
+ * Test deflate() with preset dictionary
+ */
+void test_dict_deflate(compr, comprLen)
+    Bytef *compr;
+    uLong comprLen;
+{
+    z_stream c_stream; /* compression stream */
+    int err;
+    c_stream.zalloc = (alloc_func)0;
+    c_stream.zfree = (free_func)0;
+    c_stream.opaque = (voidpf)0;
+    err = deflateInit(&c_stream, Z_BEST_COMPRESSION);
+    CHECK_ERR(err, "deflateInit");
+    err = deflateSetDictionary(&c_stream,
+			       (const Bytef*)dictionary, sizeof(dictionary));
+    CHECK_ERR(err, "deflateSetDictionary");
+    dictId = c_stream.adler;
+    c_stream.next_out = compr;
+    c_stream.avail_out = (uInt)comprLen;
+    c_stream.next_in = (Bytef*)hello;
+    c_stream.avail_in = (uInt)strlen(hello)+1;
+    err = deflate(&c_stream, Z_FINISH);
+    if (err != Z_STREAM_END) {
+        fprintf(stderr, "deflate should report Z_STREAM_END\n");
+    }
+    err = deflateEnd(&c_stream);
+    CHECK_ERR(err, "deflateEnd");
+}
+/* ===========================================================================
+ * Test inflate() with a preset dictionary
+ */
+void test_dict_inflate(compr, comprLen, uncompr, uncomprLen)
+    Bytef *compr, *uncompr;
+    uLong comprLen, uncomprLen;
+{
+    int err;
+    z_stream d_stream; /* decompression stream */
+    strcpy((char*)uncompr, "garbage");
+    d_stream.zalloc = (alloc_func)0;
+    d_stream.zfree = (free_func)0;
+    d_stream.opaque = (voidpf)0;
+    err = inflateInit(&d_stream);
+    CHECK_ERR(err, "inflateInit");
+    d_stream.next_in  = compr;
+    d_stream.avail_in = (uInt)comprLen;
+    d_stream.next_out = uncompr;
+    d_stream.avail_out = (uInt)uncomprLen;
+    for (;;) {
+        err = inflate(&d_stream, Z_NO_FLUSH);
+        if (err == Z_STREAM_END) break;
+	if (err == Z_NEED_DICT) {
+	    if (d_stream.adler != dictId) {
+		fprintf(stderr, "unexpected dictionary");
+		exit(1);
+	    }
+	    err = inflateSetDictionary(&d_stream, (const Bytef*)dictionary,
+				       sizeof(dictionary));
+	}
+        CHECK_ERR(err, "inflate with dict");
+    }
+    err = inflateEnd(&d_stream);
+    CHECK_ERR(err, "inflateEnd");
+    if (strcmp((char*)uncompr, hello)) {
+        fprintf(stderr, "bad inflate with dict\n");
+    } else {
+        printf("inflate with dictionary: %s\n", uncompr);
+    }
+}
 /* ===========================================================================
 * Usage:  example [output.gz  [input.gz]]
 */
@@ -271,7 +458,9 @@ int main(argc, argv)
    int argc;
    char *argv[];
 {
-    local Byte compr[BUFLEN];
+    Bytef *compr, *uncompr;
+    uLong comprLen = 32750*sizeof(int); /* don't overflow on MSDOS */
+    uLong uncomprLen = comprLen;
    if (zlib_version[0] != ZLIB_VERSION[0]) {
        fprintf(stderr, "incompatible zlib version\n");
@@ -280,16 +469,31 @@ int main(argc, argv)
    } else if (strcmp(zlib_version, ZLIB_VERSION) != 0) {
        fprintf(stderr, "warning: different zlib version\n");
    }
-    test_compress();
+    compr    = (Bytef*)malloc((uInt)comprLen);
+    uncompr  = (Bytef*)calloc((uInt)uncomprLen, 1); /* must be cleared */
+    if (compr == Z_NULL || uncompr == Z_NULL) {
+        printf("out of memory\n");
+	exit(1);
+    }
+    test_compress(compr, comprLen, uncompr, uncomprLen);
    test_gzio((argc > 1 ? argv[1] : "foo.gz"),
-              (argc > 2 ? argv[2] : "foo.gz"));
+              (argc > 2 ? argv[2] : "foo.gz"),
+	      uncompr, (int)uncomprLen);
+    test_deflate(compr, comprLen);
+    test_inflate(compr, comprLen, uncompr, uncomprLen);
+    test_large_deflate(compr, comprLen, uncompr, uncomprLen);
+    test_large_inflate(compr, comprLen, uncompr, uncomprLen);
-    test_deflate(compr);
+    test_flush(compr, comprLen);
-    test_inflate(compr);
+    test_sync(compr, comprLen, uncompr, uncomprLen);
-    test_flush(compr);
+    test_dict_deflate(compr, comprLen);
-    test_sync(compr);
+    test_dict_inflate(compr, comprLen, uncompr, uncomprLen);
    exit(0);
    return 0; /* to avoid warning */

--- a/gzio.c
+++ b/gzio.c
 /* gzio.c -- IO on .gz files
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -16,8 +16,7 @@ struct internal_state {int dummy;}; /* for buggy compilers */
 #define ALLOC(size) malloc(size)
 #define TRYFREE(p) {if (p) free(p);}
-#define GZ_MAGIC_1 0x1f
+static int gz_magic[2] = {0x1f, 0x8b}; /* gzip magic header */
-#define GZ_MAGIC_2 0x8b
 /* gzip flag byte */
 #define ASCII_FLAG   0x01 /* bit 0 set: file probably ascii text */
@@ -27,10 +26,6 @@ struct internal_state {int dummy;}; /* for buggy compilers */
 #define COMMENT      0x10 /* bit 4 set: file comment present */
 #define RESERVED     0xE0 /* bits 5..7: reserved */
-#ifndef SEEK_CUR
-#  define SEEK_CUR 1
-#endif
 typedef struct gz_stream {
    z_stream stream;
    int      z_err;   /* error code for last stream operation */
@@ -46,44 +41,16 @@ typedef struct gz_stream {
 } gz_stream;
-local int    destroy OF((gz_stream *s));
+local gzFile gz_open      OF((const char *path, const char *mode, int  fd));
-local gzFile gz_open OF((char *path, char *mode, int  fd));
+local int    get_byte     OF((gz_stream *s));
-local void   putLong OF((FILE *file, uLong x));
+local void   check_header OF((gz_stream *s));
-local uLong  getLong OF((Bytef *buf));
+local int    destroy      OF((gz_stream *s));
+local void   putLong      OF((FILE *file, uLong x));
- /* ===========================================================================
+local uLong  getLong      OF((gz_stream *s));
- * Cleanup then free the given gz_stream. Return a zlib error code.
- */
-local int destroy (s)
-    gz_stream *s;
-{
-    int err = Z_OK;
-    if (!s) return Z_STREAM_ERROR;
-    TRYFREE(s->inbuf);
-    TRYFREE(s->outbuf);
-    TRYFREE(s->path);
-    TRYFREE(s->msg);
-    if (s->stream.state != NULL) {
-       if (s->mode == 'w') {
-           err = deflateEnd(&(s->stream));
-       } else if (s->mode == 'r') {
-           err = inflateEnd(&(s->stream));
-       }
-    }
-    if (s->file != NULL && fclose(s->file)) {
-        err = Z_ERRNO;
-    }
-    if (s->z_err < 0) err = s->z_err;
-    TRYFREE(s);
-    return err;
-}
 /* ===========================================================================
     Opens a gzip (.gz) file for reading or writing. The mode parameter
-   is as in fopen ("rb" or "wb"). The file is given either by file descritor
+   is as in fopen ("rb" or "wb"). The file is given either by file descriptor
   or path name (if fd == -1).
     gz_open return NULL if the file could not be opened or if there was
   insufficient memory to allocate the (de)compression state; errno
@@ -91,19 +58,25 @@ local int destroy (s)
   zlib error is Z_MEM_ERROR).
 */
 local gzFile gz_open (path, mode, fd)
-    char *path;
+    const char *path;
-    char *mode;
+    const char *mode;
    int  fd;
 {
    int err;
    int level = Z_DEFAULT_COMPRESSION; /* compression level */
-    char *p = mode;
+    char *p = (char*)mode;
-    gz_stream *s = (gz_stream *)ALLOC(sizeof(gz_stream));
+    gz_stream *s;
+    char fmode[80]; /* copy of mode, without the compression level */
+    char *m = fmode;
+    if (!path || !mode) return Z_NULL;
+    s = (gz_stream *)ALLOC(sizeof(gz_stream));
    if (!s) return Z_NULL;
    s->stream.zalloc = (alloc_func)0;
    s->stream.zfree = (free_func)0;
+    s->stream.opaque = (voidpf)0;
    s->stream.next_in = s->inbuf = Z_NULL;
    s->stream.next_out = s->outbuf = Z_NULL;
    s->stream.avail_in = s->stream.avail_out = 0;
@@ -123,14 +96,18 @@ local gzFile gz_open (path, mode, fd)
    s->mode = '\0';
    do {
        if (*p == 'r') s->mode = 'r';
-        if (*p == 'w') s->mode = 'w';
+        if (*p == 'w' || *p == 'a') s->mode = 'w';
-        if (*p >= '1' && *p <= '9') level = *p - '0';
+        if (*p >= '0' && *p <= '9') {
-    } while (*p++);
+	    level = *p - '0';
+	} else {
+	    *m++ = *p; /* copy the mode */
+	}
+    } while (*p++ && m != fmode + sizeof(fmode));
    if (s->mode == '\0') return destroy(s), (gzFile)Z_NULL;
    if (s->mode == 'w') {
        err = deflateInit2(&(s->stream), level,
-                           DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
+                           Z_DEFLATED, -MAX_WBITS, DEF_MEM_LEVEL, 0);
        /* windowBits is passed < 0 to suppress zlib header */
        s->stream.next_out = s->outbuf = (Byte*)ALLOC(Z_BUFSIZE);
@@ -149,7 +126,7 @@ local gzFile gz_open (path, mode, fd)
    s->stream.avail_out = Z_BUFSIZE;
    errno = 0;
-    s->file = fd < 0 ? FOPEN(path, mode) : fdopen(fd, mode);
+    s->file = fd < 0 ? FOPEN(path, fmode) : (FILE*)fdopen(fd, fmode);
    if (s->file == NULL) {
        return destroy(s), (gzFile)Z_NULL;
@@ -157,50 +134,10 @@ local gzFile gz_open (path, mode, fd)
    if (s->mode == 'w') {
        /* Write a very simple .gz header:
         */
-        fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", GZ_MAGIC_1, GZ_MAGIC_2,
+        fprintf(s->file, "%c%c%c%c%c%c%c%c%c%c", gz_magic[0], gz_magic[1],
-               DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
+             Z_DEFLATED, 0 /*flags*/, 0,0,0,0 /*time*/, 0 /*xflags*/, OS_CODE);
    } else {
-        /* Check and skip the header:
+	check_header(s); /* skip the .gz header */
-         */
-        Byte c1 = 0, c2 = 0;
-        Byte method = 0;
-        Byte flags = 0;
-        Byte xflags = 0;
-        Byte time[4];
-        Byte osCode;
-        int c;
-        s->stream.avail_in = fread(s->inbuf, 1, 2, s->file);
-        if (s->stream.avail_in != 2 || s->inbuf[0] != GZ_MAGIC_1
-            || s->inbuf[1] != GZ_MAGIC_2) {
-            s->transparent = 1;
-            return (gzFile)s;
-        }
-        s->stream.avail_in = 0;
-        fscanf(s->file,"%c%c%4c%c%c", &method, &flags, time, &xflags, &osCode);
-        if (method != DEFLATED || feof(s->file) || (flags & RESERVED) != 0) {
-            s->z_err = Z_DATA_ERROR;
-            return (gzFile)s;
-        }
-        if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
-            long len;
-            fscanf(s->file, "%c%c", &c1, &c2);
-            len = c1 + ((long)c2<<8);
-            fseek(s->file, len, SEEK_CUR);
-        }
-        if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
-            while ((c = getc(s->file)) != 0 && c != EOF) ;
-        }
-        if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
-            while ((c = getc(s->file)) != 0 && c != EOF) ;
-        }
-        if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
-            fscanf(s->file, "%c%c", &c1, &c2);
-        }
-        if (feof(s->file)) {
-            s->z_err = Z_DATA_ERROR;
-        }
    }
    return (gzFile)s;
 }
@@ -209,25 +146,138 @@ local gzFile gz_open (path, mode, fd)
     Opens a gzip (.gz) file for reading or writing.
 */
 gzFile gzopen (path, mode)
-    char *path;
+    const char *path;
-    char *mode;
+    const char *mode;
 {
    return gz_open (path, mode, -1);
 }
 /* ===========================================================================
-     Associate a gzFile with the file descriptor fd.
+     Associate a gzFile with the file descriptor fd. fd is not dup'ed here
+   to mimic the behavio(u)r of fdopen.
 */
 gzFile gzdopen (fd, mode)
    int fd;
-    char *mode;
+    const char *mode;
 {
    char name[20];
+    if (fd < 0) return (gzFile)Z_NULL;
    sprintf(name, "<fd:%d>", fd); /* for debugging */
    return gz_open (name, mode, fd);
 }
+/* ===========================================================================
+     Read a byte from a gz_stream; update next_in and avail_in. Return EOF
+   for end of file.
+   IN assertion: the stream s has been sucessfully opened for reading.
+*/
+local int get_byte(s)
+    gz_stream *s;
+{
+    if (s->z_eof) return EOF;
+    if (s->stream.avail_in == 0) {
+	errno = 0;
+	s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
+	if (s->stream.avail_in == 0) {
+	    s->z_eof = 1;
+	    if (ferror(s->file)) s->z_err = Z_ERRNO;
+	    return EOF;
+	}
+	s->stream.next_in = s->inbuf;
+    }
+    s->stream.avail_in--;
+    return *(s->stream.next_in)++;
+}
+/* ===========================================================================
+      Check the gzip header of a gz_stream opened for reading. Set the stream
+    mode to transparent if the gzip magic header is not present; set s->err
+    to Z_DATA_ERROR if the magic header is present but the rest of the header
+    is incorrect.
+    IN assertion: the stream s has already been created sucessfully;
+       s->stream.avail_in is zero for the first time, but may be non-zero
+       for concatenated .gz files.
+*/
+local void check_header(s)
+    gz_stream *s;
+{
+    int method = 0;
+    int flags = 0;
+    uInt len;
+    int c;
+    /* Check the gzip magic header */
+    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--;
+	    s->z_err = s->stream.avail_in != 0 ? Z_OK : Z_STREAM_END;
+	    return;
+	}
+    }
+    method = get_byte(s);
+    flags = get_byte(s);
+    if (method != Z_DEFLATED || (flags & RESERVED) != 0) {
+	s->z_err = Z_DATA_ERROR;
+	return;
+    }
+    /* Discard time, xflags and OS code: */
+    for (len = 0; len < 6; len++) (void)get_byte(s);
+    if ((flags & EXTRA_FIELD) != 0) { /* skip the extra field */
+	len  =  (uInt)get_byte(s);
+	len += ((uInt)get_byte(s))<<8;
+	/* len is garbage if EOF but the loop below will quit anyway */
+	while (len-- != 0 && get_byte(s) != EOF) ;
+    }
+    if ((flags & ORIG_NAME) != 0) { /* skip the original file name */
+	while ((c = get_byte(s)) != 0 && c != EOF) ;
+    }
+    if ((flags & COMMENT) != 0) {   /* skip the .gz file comment */
+	while ((c = get_byte(s)) != 0 && c != EOF) ;
+    }
+    if ((flags & HEAD_CRC) != 0) {  /* skip the header crc */
+	for (len = 0; len < 2; len++) (void)get_byte(s);
+    }
+    s->z_err = s->z_eof ? Z_DATA_ERROR : Z_OK;
+}
+ /* ===========================================================================
+ * Cleanup then free the given gz_stream. Return a zlib error code.
+   Try freeing in the reverse order of allocations.
+ */
+local int destroy (s)
+    gz_stream *s;
+{
+    int err = Z_OK;
+    if (!s) return Z_STREAM_ERROR;
+    TRYFREE(s->msg);
+    if (s->stream.state != NULL) {
+       if (s->mode == 'w') {
+           err = deflateEnd(&(s->stream));
+       } else if (s->mode == 'r') {
+           err = inflateEnd(&(s->stream));
+       }
+    }
+    if (s->file != NULL && fclose(s->file)) {
+        err = Z_ERRNO;
+    }
+    if (s->z_err < 0) err = s->z_err;
+    TRYFREE(s->inbuf);
+    TRYFREE(s->outbuf);
+    TRYFREE(s->path);
+    TRYFREE(s);
+    return err;
+}
 /* ===========================================================================
     Reads the given number of uncompressed bytes from the compressed file.
   gzread returns the number of bytes actually read (0 for end of file).
@@ -238,52 +288,71 @@ int gzread (file, buf, len)
    unsigned len;
 {
    gz_stream *s = (gz_stream*)file;
+    Byte *start = buf; /* starting point for crc computation */
    if (s == NULL || s->mode != 'r') return Z_STREAM_ERROR;
-    if (s->transparent) {
+    if (s->z_err == Z_DATA_ERROR || s->z_err == Z_ERRNO) return -1;
-        int n = 0;
+    if (s->z_err == Z_STREAM_END) return 0;  /* EOF */
-        Byte *b = (Byte*)buf;
-        /* Copy the first two (non-magic) bytes if not done already */
-        while (s->stream.avail_in > 0 && len > 0) {
-            *b++ = *s->stream.next_in++;
-            s->stream.avail_in--;
-            len--; n++;
-        }
-        if (len == 0) return n;
-        return n + fread(b, 1, len, s->file);
-    }
-    if (s->z_err == Z_DATA_ERROR) return -1; /* bad .gz file */
-    if (s->z_err == Z_STREAM_END) return 0;  /* don't read crc as data */
    s->stream.next_out = buf;
    s->stream.avail_out = len;
    while (s->stream.avail_out != 0) {
+	if (s->transparent) {
+	    /* Copy first the lookahead bytes: */
+	    uInt n = s->stream.avail_in;
+	    if (n > s->stream.avail_out) n = s->stream.avail_out;
+	    if (n > 0) {
+		zmemcpy(s->stream.next_out, s->stream.next_in, n);
+		s->stream.next_out  += n;
+		s->stream.next_in   += n;
+		s->stream.avail_out -= n;
+		s->stream.avail_in  -= n;
+	    }
+	    if (s->stream.avail_out > 0) {
+		s->stream.avail_out -= fread(s->stream.next_out,
+					     1, s->stream.avail_out, s->file);
+	    }
+	    return (int)(len - s->stream.avail_out);
+	}
        if (s->stream.avail_in == 0 && !s->z_eof) {
            errno = 0;
-            s->stream.avail_in =
+            s->stream.avail_in = fread(s->inbuf, 1, Z_BUFSIZE, s->file);
-                fread(s->inbuf, 1, Z_BUFSIZE, s->file);
            if (s->stream.avail_in == 0) {
                s->z_eof = 1;
-            } else if (s->stream.avail_in == (uInt)EOF) {
+		if (ferror(s->file)) {
-                s->stream.avail_in = 0;
+		    s->z_err = Z_ERRNO;
-                s->z_eof = 1;
+		    break;
-                s->z_err = Z_ERRNO;
+		}
-                break;
            }
            s->stream.next_in = s->inbuf;
        }
        s->z_err = inflate(&(s->stream), Z_NO_FLUSH);
-        if (s->z_err == Z_STREAM_END ||
+	if (s->z_err == Z_STREAM_END) {
-            s->z_err != Z_OK  || s->z_eof) break;
+	    /* Check CRC and original size */
+	    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
+	    start = s->stream.next_out;
+	    if (getLong(s) != s->crc || getLong(s) != s->stream.total_out) {
+		s->z_err = Z_DATA_ERROR;
+	    } else {
+		/* Check for concatenated .gz files: */
+		check_header(s);
+		if (s->z_err == Z_OK) {
+		    inflateReset(&(s->stream));
+		    s->crc = crc32(0L, Z_NULL, 0);
+		}
+	    }
+	}
+	if (s->z_err != Z_OK || s->z_eof) break;
    }
-    len -= s->stream.avail_out;
+    s->crc = crc32(s->crc, start, (uInt)(s->stream.next_out - start));
-    s->crc = crc32(s->crc, buf, len);
-    return (int)len;
+    return (int)(len - s->stream.avail_out);
 }
 /* ===========================================================================
@@ -292,7 +361,7 @@ int gzread (file, buf, len)
 */
 int gzwrite (file, buf, len)
    gzFile file;
-    voidp buf;
+    const voidp buf;
    unsigned len;
 {
    gz_stream *s = (gz_stream*)file;
@@ -343,7 +412,7 @@ int gzflush (file, flush)
        len = Z_BUFSIZE - s->stream.avail_out;
        if (len != 0) {
-            if (fwrite(s->outbuf, 1, len, s->file) != len) {
+            if ((uInt)fwrite(s->outbuf, 1, len, s->file) != len) {
                s->z_err = Z_ERRNO;
                return Z_ERRNO;
            }
@@ -379,18 +448,19 @@ local void putLong (file, x)
 }
 /* ===========================================================================
-   Reads a long in LSB order from the given buffer
+   Reads a long in LSB order from the given gz_stream. Sets 
 */
-local uLong getLong (buf)
+local uLong getLong (s)
-    Bytef *buf;
+    gz_stream *s;
 {
-    uLong x = 0;
+    uLong x = (uLong)get_byte(s);
-    Bytef *p = buf+4;
+    int c;
-    do {
+    x += ((uLong)get_byte(s))<<8;
-        x <<= 8;
+    x += ((uLong)get_byte(s))<<16;
-        x |= *--p; 
+    c = get_byte(s);
-    } while (p != buf);
+    if (c == EOF) s->z_err = Z_DATA_ERROR;
+    x += ((uLong)c)<<24;
    return x;
 }
@@ -401,7 +471,6 @@ local uLong getLong (buf)
 int gzclose (file)
    gzFile file;
 {
-    uInt n;
    int err;
    gz_stream *s = (gz_stream*)file;
@@ -414,25 +483,6 @@ int gzclose (file)
        putLong (s->file, s->crc);
        putLong (s->file, s->stream.total_in);
-    } else if (s->mode == 'r' && s->z_err == Z_STREAM_END) {
-        /* slide CRC and original size if they are at the end of inbuf */
-        if ((n = s->stream.avail_in) < 8  && !s->z_eof) {
-            Byte *p = s->inbuf;
-	    Bytef *q = s->stream.next_in;
-            while (n--) { *p++ = *q++; };
-            n = s->stream.avail_in;
-            n += fread(p, 1, 8, s->file);
-            s->stream.next_in = s->inbuf;
-        }
-        /* check CRC and original size */
-        if (n < 8 ||
-            getLong(s->stream.next_in) != s->crc ||
-            getLong(s->stream.next_in + 4) != s->stream.total_out) {
-            s->z_err = Z_DATA_ERROR;
-        }
    }
    return destroy(file);
 }
@@ -453,14 +503,14 @@ char*  gzerror (file, errnum)
    if (s == NULL) {
        *errnum = Z_STREAM_ERROR;
-        return z_errmsg[1-Z_STREAM_ERROR];
+        return ERR_MSG(Z_STREAM_ERROR);
    }
    *errnum = s->z_err;
-    if (*errnum == Z_OK) return "";
+    if (*errnum == Z_OK) return (char*)"";
-    m =  *errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg;
+    m =  (char*)(*errnum == Z_ERRNO ? zstrerror(errno) : s->stream.msg);
-    if (m == NULL || *m == '\0') m = z_errmsg[1-s->z_err];
+    if (m == NULL || *m == '\0') m = (char*)z_errmsg[1-s->z_err];
    TRYFREE(s->msg);
    s->msg = (char*)ALLOC(strlen(s->path) + strlen(m) + 3);

--- a/infblock.c
+++ b/infblock.c
 /* infblock.c -- interpret and process block types to last block
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -81,7 +81,7 @@ uLongf *c;
  s->bitb = 0;
  s->read = s->write = s->window;
  if (s->checkfn != Z_NULL)
-    s->check = (*s->checkfn)(0L, Z_NULL, 0);
+    z->adler = s->check = (*s->checkfn)(0L, Z_NULL, 0);
  Trace((stderr, "inflate:   blocks reset\n"));
 }
@@ -172,17 +172,17 @@ int r;
        case 3:                         /* illegal */
          DUMPBITS(3)
          s->mode = BAD;
-          z->msg = "invalid block type";
+          z->msg = (char*)"invalid block type";
          r = Z_DATA_ERROR;
          LEAVE
      }
      break;
    case LENS:
      NEEDBITS(32)
-      if (((~b) >> 16) != (b & 0xffff))
+      if ((((~b) >> 16) & 0xffff) != (b & 0xffff))
      {
        s->mode = BAD;
-        z->msg = "invalid stored block lengths";
+        z->msg = (char*)"invalid stored block lengths";
        r = Z_DATA_ERROR;
        LEAVE
      }
@@ -215,7 +215,7 @@ int r;
      if ((t & 0x1f) > 29 || ((t >> 5) & 0x1f) > 29)
      {
        s->mode = BAD;
-        z->msg = "too many length or distance symbols";
+        z->msg = (char*)"too many length or distance symbols";
        r = Z_DATA_ERROR;
        LEAVE
      }
@@ -285,7 +285,7 @@ int r;
              (c == 16 && i < 1))
          {
            s->mode = BAD;
-            z->msg = "invalid bit length repeat";
+            z->msg = (char*)"invalid bit length repeat";
            r = Z_DATA_ERROR;
            LEAVE
          }
@@ -383,3 +383,14 @@ uLongf *c;
  Trace((stderr, "inflate:   blocks freed\n"));
  return Z_OK;
 }
+void inflate_set_dictionary(s, z, d, n)
+inflate_blocks_statef *s;
+z_stream *z;
+const Bytef *d;
+uInt  n;
+{
+  zmemcpy((charf *)s->window, d, n);
+  s->read = s->write = s->window + n;
+}
--- a/infblock.h
+++ b/infblock.h
 /* infblock.h -- header to use infblock.c
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -30,3 +30,9 @@ extern int inflate_blocks_free OF((
    inflate_blocks_statef *,
    z_stream *,
    uLongf *));                  /* check value on output */
+extern void inflate_set_dictionary OF((
+    inflate_blocks_statef *s,
+    z_stream *z,
+    const Bytef *d,  /* dictionary */
+    uInt  n));       /* dictionary length */
--- a/infcodes.c
+++ b/infcodes.c
 /* infcodes.c -- process literals and length/distance pairs
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -58,7 +58,8 @@ struct inflate_codes_state {
 inflate_codes_statef *inflate_codes_new(bl, bd, tl, td, z)
 uInt bl, bd;
-inflate_huft *tl, *td;
+inflate_huft *tl;
+inflate_huft *td; /* need separate declaration for Borland C++ */
 z_stream *z;
 {
  inflate_codes_statef *c;
@@ -152,7 +153,7 @@ int r;
        break;
      }
      c->mode = BADCODE;        /* invalid code */
-      z->msg = "invalid literal/length code";
+      z->msg = (char*)"invalid literal/length code";
      r = Z_DATA_ERROR;
      LEAVE
    case LENEXT:        /* i: getting length extra (have base) */
@@ -184,7 +185,7 @@ int r;
        break;
      }
      c->mode = BADCODE;        /* invalid code */
-      z->msg = "invalid distance code";
+      z->msg = (char*)"invalid distance code";
      r = Z_DATA_ERROR;
      LEAVE
    case DISTEXT:       /* i: getting distance extra */
@@ -202,7 +203,7 @@ int r;
 #else
      f = q - c->sub.copy.dist;
      if ((uInt)(q - s->window) < c->sub.copy.dist)
-        f = s->end - (c->sub.copy.dist - (q - s->window));
+        f = s->end - (c->sub.copy.dist - (uInt)(q - s->window));
 #endif
      while (c->len)
      {

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

--- a/inffast.c
+++ b/inffast.c
 /* inffast.c -- process literals and length/distance pairs fast
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -29,7 +29,8 @@ struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 int inflate_fast(bl, bd, tl, td, s, z)
 uInt bl, bd;
-inflate_huft *tl, *td;
+inflate_huft *tl;
+inflate_huft *td; /* need separate declaration for Borland C++ */
 inflate_blocks_statef *s;
 z_stream *z;
 {
@@ -102,7 +103,7 @@ z_stream *z;
            }
            else                        /* else offset after destination */
            {
-              e = d - (q - s->window);  /* bytes from offset to end */
+              e = d - (uInt)(q - s->window); /* bytes from offset to end */
              r = s->end - e;           /* pointer to offset */
              if (c > e)                /* if source crosses, */
              {
@@ -122,7 +123,7 @@ z_stream *z;
            e = (t = t->next + ((uInt)b & inflate_mask[e]))->exop;
          else
          {
-            z->msg = "invalid distance code";
+            z->msg = (char*)"invalid distance code";
            UNGRAB
            UPDATE
            return Z_DATA_ERROR;
@@ -152,7 +153,7 @@ z_stream *z;
      }
      else
      {
-        z->msg = "invalid literal/length code";
+        z->msg = (char*)"invalid literal/length code";
        UNGRAB
        UPDATE
        return Z_DATA_ERROR;

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

--- a/inflate.c
+++ b/inflate.c
 /* inflate.c -- zlib interface to inflate modules
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -15,6 +15,11 @@ struct internal_state {
  enum {
      METHOD,   /* waiting for method byte */
      FLAG,     /* waiting for flag byte */
+      DICT4,    /* four dictionary check bytes to go */
+      DICT3,    /* three dictionary check bytes to go */
+      DICT2,    /* two dictionary check bytes to go */
+      DICT1,    /* one dictionary check byte to go */
+      DICT0,    /* waiting for inflateSetDictionary */
      BLOCKS,   /* decompressing blocks */
      CHECK4,   /* four check bytes to go */
      CHECK3,   /* three check bytes to go */
@@ -75,14 +80,25 @@ z_stream *z;
 }
-int inflateInit2(z, w)
+int inflateInit2_(z, w, version, stream_size)
 z_stream *z;
 int w;
+const char *version;
+int stream_size;
 {
+  if (version == Z_NULL || version[0] != ZLIB_VERSION[0] ||
+      stream_size != sizeof(z_stream))
+      return Z_VERSION_ERROR;
  /* initialize state */
  if (z == Z_NULL)
    return Z_STREAM_ERROR;
-  if (z->zalloc == Z_NULL) z->zalloc = zcalloc;
+  z->msg = Z_NULL;
+  if (z->zalloc == Z_NULL)
+  {
+    z->zalloc = zcalloc;
+    z->opaque = (voidpf)0;
+  }
  if (z->zfree == Z_NULL) z->zfree = zcfree;
  if ((z->state = (struct internal_state FAR *)
       ZALLOC(z,1,sizeof(struct internal_state))) == Z_NULL)
@@ -107,7 +123,7 @@ int w;
  /* create inflate_blocks state */
  if ((z->state->blocks =
-       inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, 1 << w))
+      inflate_blocks_new(z, z->state->nowrap ? Z_NULL : adler32, (uInt)1 << w))
      == Z_NULL)
  {
    inflateEnd(z);
@@ -121,10 +137,12 @@ int w;
 }
-int inflateInit(z)
+int inflateInit_(z, version, stream_size)
 z_stream *z;
+const char *version;
+int stream_size;
 {
-  return inflateInit2(z, DEF_WBITS);
+  return inflateInit2_(z, DEF_WBITS, version, stream_size);
 }
@@ -138,46 +156,68 @@ int f;
  int r = f;    /* to avoid warning about unused f */
  uInt b;
-  if (z == Z_NULL || z->next_in == Z_NULL)
+  if (z == Z_NULL || z->state == Z_NULL || z->next_in == Z_NULL)
    return Z_STREAM_ERROR;
  r = Z_BUF_ERROR;
  while (1) switch (z->state->mode)
  {
    case METHOD:
      NEEDBYTE
-      if (((z->state->sub.method = NEXTBYTE) & 0xf) != DEFLATED)
+      if (((z->state->sub.method = NEXTBYTE) & 0xf) != Z_DEFLATED)
      {
        z->state->mode = BAD;
-        z->msg = "unknown compression method";
+        z->msg = (char*)"unknown compression method";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      if ((z->state->sub.method >> 4) + 8 > z->state->wbits)
      {
        z->state->mode = BAD;
-        z->msg = "invalid window size";
+        z->msg = (char*)"invalid window size";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      z->state->mode = FLAG;
    case FLAG:
      NEEDBYTE
-      if ((b = NEXTBYTE) & 0x20)
+      b = NEXTBYTE;
-      {
-        z->state->mode = BAD;
-        z->msg = "invalid reserved bit";
-        z->state->sub.marker = 5;       /* can't try inflateSync */
-        break;
-      }
      if (((z->state->sub.method << 8) + b) % 31)
      {
        z->state->mode = BAD;
-        z->msg = "incorrect header check";
+        z->msg = (char*)"incorrect header check";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
      Trace((stderr, "inflate: zlib header ok\n"));
-      z->state->mode = BLOCKS;
+      if (!(b & PRESET_DICT))
+      {
+        z->state->mode = BLOCKS;
+	break;
+      }
+      z->state->mode = DICT4;
+    case DICT4:
+      NEEDBYTE
+      z->state->sub.check.need = (uLong)NEXTBYTE << 24;
+      z->state->mode = DICT3;
+    case DICT3:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 16;
+      z->state->mode = DICT2;
+    case DICT2:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE << 8;
+      z->state->mode = DICT1;
+    case DICT1:
+      NEEDBYTE
+      z->state->sub.check.need += (uLong)NEXTBYTE;
+      z->adler = z->state->sub.check.need;
+      z->state->mode = DICT0;
+      return Z_NEED_DICT;
+    case DICT0:
+      z->state->mode = BAD;
+      z->msg = (char*)"need dictionary";
+      z->state->sub.marker = 0;       /* can try inflateSync */
+      return Z_STREAM_ERROR;
    case BLOCKS:
      r = inflate_blocks(z->state->blocks, z, r);
      if (r == Z_DATA_ERROR)
@@ -215,7 +255,7 @@ int f;
      if (z->state->sub.check.was != z->state->sub.check.need)
      {
        z->state->mode = BAD;
-        z->msg = "incorrect data check";
+        z->msg = (char*)"incorrect data check";
        z->state->sub.marker = 5;       /* can't try inflateSync */
        break;
      }
@@ -231,6 +271,29 @@ int f;
 }
+int inflateSetDictionary(z, dictionary, dictLength)
+z_stream *z;
+const Bytef *dictionary;
+uInt  dictLength;
+{
+  uInt length = dictLength;
+  if (z == Z_NULL || z->state == Z_NULL || z->state->mode != DICT0)
+    return Z_STREAM_ERROR;
+  if (adler32(1L, dictionary, dictLength) != z->adler) return Z_DATA_ERROR;
+  z->adler = 1L;
+  if (length >= (1<<z->state->wbits))
+  {
+    length = (1<<z->state->wbits)-1;
+    dictionary += dictLength - length;
+  }
+  inflate_set_dictionary(z->state->blocks, z, dictionary, length);
+  z->state->mode = BLOCKS;
+  return Z_OK;
+}
 int inflateSync(z)
 z_stream *z;
 {

--- a/inftrees.c
+++ b/inftrees.c
 /* inftrees.c -- generate Huffman trees for efficient decoding
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
 #include "zutil.h"
 #include "inftrees.h"
+char inflate_copyright[] = " inflate 1.0 Copyright 1995-1996 Mark Adler ";
+/*
+  If you use the zlib library in a product, an acknowledgment is welcome
+  in the documentation of your product. If for some reason you cannot
+  include such an acknowledgment, I would appreciate that you keep this
+  copyright string in the executable of your product.
+ */
 struct internal_state  {int dummy;}; /* for buggy compilers */
 /* simplify the use of the inflate_huft type with some defines */
@@ -30,23 +37,19 @@ local voidpf falloc OF((
    uInt,               /* number of items */
    uInt));             /* size of item */
-local void ffree OF((
-    voidpf q,            /* opaque pointer (not used) */
-    voidpf p));          /* what to free (not used) */
 /* Tables for deflate from PKZIP's appnote.txt. */
-local uInt cplens[] = { /* Copy lengths for literal codes 257..285 */
+local uInt cplens[31] = { /* Copy lengths for literal codes 257..285 */
        3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 15, 17, 19, 23, 27, 31,
        35, 43, 51, 59, 67, 83, 99, 115, 131, 163, 195, 227, 258, 0, 0};
        /* actually lengths - 2; also see note #13 above about 258 */
-local uInt cplext[] = { /* Extra bits for literal codes 257..285 */
+local uInt cplext[31] = { /* Extra bits for literal codes 257..285 */
        0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2,
        3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0, 192, 192}; /* 192==invalid */
-local uInt cpdist[] = { /* Copy offsets for distance codes 0..29 */
+local uInt cpdist[30] = { /* Copy offsets for distance codes 0..29 */
        1, 2, 3, 4, 5, 7, 9, 13, 17, 25, 33, 49, 65, 97, 129, 193,
        257, 385, 513, 769, 1025, 1537, 2049, 3073, 4097, 6145,
        8193, 12289, 16385, 24577};
-local uInt cpdext[] = { /* Extra bits for distance codes */
+local uInt cpdext[30] = { /* Extra bits for distance codes */
        0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6,
        7, 7, 8, 8, 9, 9, 10, 10, 11, 11,
        12, 12, 13, 13};
@@ -304,11 +307,11 @@ z_stream *z;            /* for zfree function */
  r = huft_build(c, 19, 19, (uIntf*)Z_NULL, (uIntf*)Z_NULL, tb, bb, z);
  if (r == Z_DATA_ERROR)
-    z->msg = "oversubscribed dynamic bit lengths tree";
+    z->msg = (char*)"oversubscribed dynamic bit lengths tree";
  else if (r == Z_BUF_ERROR)
  {
    inflate_trees_free(*tb, z);
-    z->msg = "incomplete dynamic bit lengths tree";
+    z->msg = (char*)"incomplete dynamic bit lengths tree";
    r = Z_DATA_ERROR;
  }
  return r;
@@ -331,11 +334,11 @@ z_stream *z;            /* for zfree function */
  if ((r = huft_build(c, nl, 257, cplens, cplext, tl, bl, z)) != Z_OK)
  {
    if (r == Z_DATA_ERROR)
-      z->msg = "oversubscribed literal/length tree";
+      z->msg = (char*)"oversubscribed literal/length tree";
    else if (r == Z_BUF_ERROR)
    {
      inflate_trees_free(*tl, z);
-      z->msg = "incomplete literal/length tree";
+      z->msg = (char*)"incomplete literal/length tree";
      r = Z_DATA_ERROR;
    }
    return r;
@@ -345,14 +348,14 @@ z_stream *z;            /* for zfree function */
  if ((r = huft_build(c + nl, nd, 0, cpdist, cpdext, td, bd, z)) != Z_OK)
  {
    if (r == Z_DATA_ERROR)
-      z->msg = "oversubscribed literal/length tree";
+      z->msg = (char*)"oversubscribed literal/length tree";
    else if (r == Z_BUF_ERROR) {
 #ifdef PKZIP_BUG_WORKAROUND
      r = Z_OK;
    }
 #else
      inflate_trees_free(*td, z);
-      z->msg = "incomplete literal/length tree";
+      z->msg = (char*)"incomplete literal/length tree";
      r = Z_DATA_ERROR;
    }
    inflate_trees_free(*tl, z);
@@ -366,10 +369,8 @@ z_stream *z;            /* for zfree function */
 /* build fixed tables only once--keep them here */
-local int fixed_lock = 0;
 local int fixed_built = 0;
 #define FIXEDH 530      /* number of hufts used by fixed tables */
-local uInt fixed_left = FIXEDH;
 local inflate_huft fixed_mem[FIXEDH];
 local uInt fixed_bl;
 local uInt fixed_bd;
@@ -378,24 +379,14 @@ local inflate_huft *fixed_td;
 local voidpf falloc(q, n, s)
-voidpf q;        /* opaque pointer (not used) */
+voidpf q;       /* opaque pointer */
 uInt n;         /* number of items */
 uInt s;         /* size of item */
 {
-  Assert(s == sizeof(inflate_huft) && n <= fixed_left,
+  Assert(s == sizeof(inflate_huft) && n <= *(intf *)q,
         "inflate_trees falloc overflow");
-  if (q) s++; /* to make some compilers happy */
+  *(intf *)q -= n+s-s; /* s-s to avoid warning */
-  fixed_left -= n;
+  return (voidpf)(fixed_mem + *(intf *)q);
-  return (voidpf)(fixed_mem + fixed_left);
-}
-local void ffree(q, p)
-voidpf q;
-voidpf p;
-{
-  Assert(0, "inflate_trees ffree called!");
-  if (q) q = p; /* to make some compilers happy */
 }
@@ -405,19 +396,18 @@ uIntf *bd;               /* distance desired/actual bit depth */
 inflate_huft * FAR *tl;  /* literal/length tree result */
 inflate_huft * FAR *td;  /* distance tree result */
 {
-  /* build fixed tables if not built already--lock out other instances */
+  /* build fixed tables if not already (multiple overlapped executions ok) */
-  while (++fixed_lock > 1)
-    fixed_lock--;
  if (!fixed_built)
  {
    int k;              /* temporary variable */
    unsigned c[288];    /* length list for huft_build */
    z_stream z;         /* for falloc function */
+    int f = FIXEDH;     /* number of hufts left in fixed_mem */
    /* set up fake z_stream for memory routines */
    z.zalloc = falloc;
-    z.zfree = ffree;
+    z.zfree = Z_NULL;
-    z.opaque = Z_NULL;
+    z.opaque = (voidpf)&f;
    /* literal table */
    for (k = 0; k < 144; k++)
@@ -438,9 +428,9 @@ inflate_huft * FAR *td;  /* distance tree result */
    huft_build(c, 30, 0, cpdist, cpdext, &fixed_td, &fixed_bd, &z);
    /* done */
+    Assert(f == 0, "invalid build of fixed tables");
    fixed_built = 1;
  }
-  fixed_lock--;
  *bl = fixed_bl;
  *bd = fixed_bd;
  *tl = fixed_tl;
@@ -456,10 +446,19 @@ z_stream *z;            /* for zfree function */
   list of the tables it made, with the links in a dummy first entry of
   each table. */
 {
-  register inflate_huft *p, *q;
+  register inflate_huft *p, *q, *r;
+  /* Reverse linked list */
+  p = Z_NULL;
+  q = t;
+  while (q != Z_NULL)
+  {
+    r = (q - 1)->next;
+    (q - 1)->next = p;
+    p = q;
+    q = r;
+  }
  /* Go through linked list, freeing from the malloced (t[-1]) address. */
-  p = t;
  while (p != Z_NULL)
  {
    q = (--p)->next;

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

--- a/infutil.c
+++ b/infutil.c
 /* inflate_util.c -- data and routines common to blocks and codes
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -12,7 +12,7 @@
 struct inflate_codes_state {int dummy;}; /* for buggy compilers */
 /* And'ing with mask[n] masks the lower n bits */
-uInt inflate_mask[] = {
+uInt inflate_mask[17] = {
    0x0000,
    0x0001, 0x0003, 0x0007, 0x000f, 0x001f, 0x003f, 0x007f, 0x00ff,
    0x01ff, 0x03ff, 0x07ff, 0x0fff, 0x1fff, 0x3fff, 0x7fff, 0xffff
@@ -43,7 +43,7 @@ int r;
  /* update check information */
  if (s->checkfn != Z_NULL)
-    s->check = (*s->checkfn)(s->check, q, n);
+    z->adler = s->check = (*s->checkfn)(s->check, q, n);
  /* copy as far as end of window */
  zmemcpy(p, q, n);
@@ -69,7 +69,7 @@ int r;
    /* update check information */
    if (s->checkfn != Z_NULL)
-      s->check = (*s->checkfn)(s->check, q, n);
+      z->adler = s->check = (*s->checkfn)(s->check, q, n);
    /* copy */
    zmemcpy(p, q, n);

--- a/infutil.h
+++ b/infutil.h
 /* infutil.h -- types and macros common to blocks and codes
- * Copyright (C) 1995 Mark Adler
+ * Copyright (C) 1995-1996 Mark Adler
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -8,11 +8,10 @@
   subject to change. Applications should only use zlib.h.
 */
-/* inflate blocks semi-private state */
+#ifndef _INFUTIL_H
-struct inflate_blocks_state {
+#define _INFUTIL_H
-  /* mode */
+typedef enum {
-  enum {
      TYPE,     /* get type bits (3, including end bit) */
      LENS,     /* get lengths for stored */
      STORED,   /* processing stored block */
@@ -23,7 +22,13 @@ struct inflate_blocks_state {
      DRY,      /* output remaining window bytes */
      DONE,     /* finished last block, done */
      BAD}      /* got a data error--stuck here */
-    mode;               /* current inflate_block mode */
+inflate_block_mode;
+/* inflate blocks semi-private state */
+struct inflate_blocks_state {
+  /* mode */
+  inflate_block_mode  mode;     /* current inflate_block mode */
  /* mode dependent information */
  union {
@@ -70,17 +75,17 @@ struct inflate_blocks_state {
 #define NEEDBITS(j) {while(k<(j)){NEEDBYTE;b|=((uLong)NEXTBYTE)<<k;k+=8;}}
 #define DUMPBITS(j) {b>>=(j);k-=(j);}
 /*   output bytes */
-#define WAVAIL (q<s->read?s->read-q-1:s->end-q)
+#define WAVAIL (uInt)(q<s->read?s->read-q-1:s->end-q)
-#define LOADOUT {q=s->write;m=WAVAIL;}
+#define LOADOUT {q=s->write;m=(uInt)WAVAIL;}
-#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=WAVAIL;}}
+#define WRAP {if(q==s->end&&s->read!=s->window){q=s->window;m=(uInt)WAVAIL;}}
 #define FLUSH {UPDOUT r=inflate_flush(s,z,r); LOADOUT}
 #define NEEDOUT {if(m==0){WRAP if(m==0){FLUSH WRAP if(m==0) LEAVE}}r=Z_OK;}
 #define OUTBYTE(a) {*q++=(Byte)(a);m--;}
 /*   load local pointers */
 #define LOAD {LOADIN LOADOUT}
-/* masks for lower bits */
+/* masks for lower bits (size given to avoid silly warnings with Visual C++) */
-extern uInt inflate_mask[];
+extern uInt inflate_mask[17];
 /* copy as much as possible from the sliding window to the output area */
 extern int inflate_flush OF((
@@ -89,3 +94,5 @@ extern int inflate_flush OF((
    int));
 struct internal_state      {int dummy;}; /* for buggy compilers */
+#endif
--- a/minigzip.c
+++ b/minigzip.c
 /* minigzip.c -- simulate gzip using the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -18,14 +18,13 @@
 #include <stdio.h>
 #include "zlib.h"
-#ifndef __GO32__
-extern void exit  OF((int));
-#endif
-extern int unlink OF((const char *));
 #ifdef STDC
 #  include <string.h>
+#  include <stdlib.h>
+#else
+   extern void exit  OF((int));
 #endif
+extern int unlink OF((const char *));
 #if defined(MSDOS) || defined(OS2) || defined(WIN32)
 #  include <fcntl.h>
@@ -53,7 +52,7 @@ extern int unlink OF((const char *));
 char *prog;
-void error           OF((char *msg));
+void error           OF((const char *msg));
 void gz_compress     OF((FILE   *in, gzFile out));
 void gz_uncompress   OF((gzFile in, FILE   *out));
 void file_compress   OF((char  *file));
@@ -64,7 +63,7 @@ int  main            OF((int argc, char *argv[]));
 * Display error message and exit
 */
 void error(msg)
-    char *msg;
+    const char *msg;
 {
    fprintf(stderr, "%s: %s\n", prog, msg);
    exit(1);
@@ -89,7 +88,7 @@ void gz_compress(in, out)
        }
        if (len == 0) break;
-        if (gzwrite(out, buf, len) != len) error(gzerror(out, &err));
+        if (gzwrite(out, buf, (unsigned)len) != len) error(gzerror(out, &err));
    }
    fclose(in);
    if (gzclose(out) != Z_OK) error("failed gzclose");
@@ -111,7 +110,9 @@ void gz_uncompress(in, out)
        if (len < 0) error (gzerror(in, &err));
        if (len == 0) break;
-        if (fwrite(buf, 1, len, out) != (uInt)len) error("failed fwrite");
+        if ((int)fwrite(buf, 1, (unsigned)len, out) != len) {
+	    error("failed fwrite");
+	}
    }
    if (fclose(out)) error("failed fclose");

--- a/trees.c
+++ b/trees.c
 /* trees.c -- output deflated data using Huffman coding
- * Copyright (C) 1995 Jean-loup Gailly
+ * Copyright (C) 1995-1996 Jean-loup Gailly
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -78,13 +78,12 @@ local uch bl_order[BL_CODES]
 /* ===========================================================================
 * Local data. These are initialized only once.
- * To do: initialize at compile time to be completely reentrant. ???
 */
 local ct_data static_ltree[L_CODES+2];
 /* The static literal tree. Since the bit lengths are imposed, there is no
 * need for the L_CODES extra codes used during heap construction. However
- * The codes 286 and 287 are needed to build a canonical tree (see ct_init
+ * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
 * below).
 */
@@ -129,7 +128,7 @@ local static_tree_desc  static_bl_desc =
 * Local (static) routines in this file.
 */
-local void ct_static_init OF((void));
+local void tr_static_init OF((void));
 local void init_block     OF((deflate_state *s));
 local void pqdownheap     OF((deflate_state *s, ct_data *tree, int k));
 local void gen_bitlen     OF((deflate_state *s, tree_desc *desc));
@@ -187,7 +186,7 @@ local void send_bits(s, value, length)
    int value;  /* value to send */
    int length; /* number of bits */
 {
-    Tracev((stderr," l %2d v %4x ", length, value));
+    Tracevv((stderr," l %2d v %4x ", length, value));
    Assert(length > 0 && length <= 15, "invalid length");
    s->bits_sent += (ulg)length;
@@ -227,11 +226,13 @@ local void send_bits(s, value, length)
 /* the arguments must not have side effects */
 /* ===========================================================================
- * Initialize the various 'constant' tables.
+ * Initialize the various 'constant' tables. In a multi-threaded environment,
- * To do: do this at compile time.
+ * this function may be called by two threads concurrently, but this is
+ * harmless since both invocations do exactly the same thing.
 */
-local void ct_static_init()
+local void tr_static_init()
 {
+    static static_init_done = 0;
    int n;        /* iterates over tree elements */
    int bits;     /* bit counter */
    int length;   /* length value */
@@ -240,6 +241,8 @@ local void ct_static_init()
    ush bl_count[MAX_BITS+1];
    /* number of codes at each bit length for an optimal tree */
+    if (static_init_done) return;
    /* Initialize the mapping length (0..255) -> length code (0..28) */
    length = 0;
    for (code = 0; code < LENGTH_CODES-1; code++) {
@@ -248,7 +251,7 @@ local void ct_static_init()
            length_code[length++] = (uch)code;
        }
    }
-    Assert (length == 256, "ct_static_init: length != 256");
+    Assert (length == 256, "tr_static_init: length != 256");
    /* Note that the length 255 (match length 258) can be represented
     * in two different ways: code 284 + 5 bits or code 285, so we
     * overwrite length_code[255] to use the best encoding:
@@ -263,7 +266,7 @@ local void ct_static_init()
            dist_code[dist++] = (uch)code;
        }
    }
-    Assert (dist == 256, "ct_static_init: dist != 256");
+    Assert (dist == 256, "tr_static_init: dist != 256");
    dist >>= 7; /* from now on, all distances are divided by 128 */
    for ( ; code < D_CODES; code++) {
        base_dist[code] = dist << 7;
@@ -271,7 +274,7 @@ local void ct_static_init()
            dist_code[256 + dist++] = (uch)code;
        }
    }
-    Assert (dist == 256, "ct_static_init: 256+dist != 512");
+    Assert (dist == 256, "tr_static_init: 256+dist != 512");
    /* Construct the codes of the static literal tree */
    for (bits = 0; bits <= MAX_BITS; bits++) bl_count[bits] = 0;
@@ -289,19 +292,18 @@ local void ct_static_init()
    /* The static distance tree is trivial: */
    for (n = 0; n < D_CODES; n++) {
        static_dtree[n].Len = 5;
-        static_dtree[n].Code = bi_reverse(n, 5);
+        static_dtree[n].Code = bi_reverse((unsigned)n, 5);
    }
+    static_init_done = 1;
 }
 /* ===========================================================================
 * Initialize the tree data structures for a new zlib stream.
 */
-void ct_init(s)
+void _tr_init(s)
    deflate_state *s;
 {
-    if (static_dtree[0].Len == 0) {
+    tr_static_init();
-        ct_static_init();              /* To do: at compile time */
-    }
    s->compressed_len = 0L;
@@ -523,7 +525,7 @@ local void gen_codes (tree, max_code, bl_count)
        /* Now reverse the bits */
        tree[n].Code = bi_reverse(next_code[len]++, len);
-        Tracec(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
+        Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
             n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
    }
 }
@@ -783,14 +785,14 @@ local void send_all_trees(s, lcodes, dcodes, blcodes)
 /* ===========================================================================
 * Send a stored block
 */
-void ct_stored_block(s, buf, stored_len, eof)
+void _tr_stored_block(s, buf, stored_len, eof)
    deflate_state *s;
    charf *buf;       /* input block */
    ulg stored_len;   /* length of input block */
    int eof;          /* true if this is the last block for a file */
 {
    send_bits(s, (STORED_BLOCK<<1)+eof, 3);  /* send block type */
-    s->compressed_len = (s->compressed_len + 3 + 7) & ~7L;
+    s->compressed_len = (s->compressed_len + 3 + 7) & (ulg)~7L;
    s->compressed_len += (stored_len + 4) << 3;
    copy_block(s, buf, (unsigned)stored_len, 1); /* with header */
@@ -799,12 +801,15 @@ void ct_stored_block(s, buf, stored_len, eof)
 /* ===========================================================================
 * Send one empty static block to give enough lookahead for inflate.
 * This takes 10 bits, of which 7 may remain in the bit buffer.
- * The current inflate code requires 9 bits of lookahead. If the EOB
+ * The current inflate code requires 9 bits of lookahead. If the
- * code for the previous block was coded on 5 bits or less, inflate
+ * last two codes for the previous block (real code plus EOB) were coded
- * may have only 5+3 bits of lookahead to decode this EOB.
+ * on 5 bits or less, inflate may have only 5+3 bits of lookahead to decode
- * (There are no problems if the previous block is stored or fixed.)
+ * the last real code. In this case we send two empty static blocks instead
+ * of one. (There are no problems if the previous block is stored or fixed.)
+ * To simplify the code, we assume the worst case of last real code encoded
+ * on one bit only.
 */
-void ct_align(s)
+void _tr_align(s)
    deflate_state *s;
 {
    send_bits(s, STATIC_TREES<<1, 3);
@@ -812,10 +817,11 @@ void ct_align(s)
    s->compressed_len += 10L; /* 3 for block type, 7 for EOB */
    bi_flush(s);
    /* Of the 10 bits for the empty block, we have already sent
-     * (10 - bi_valid) bits. The lookahead for the EOB of the previous
+     * (10 - bi_valid) bits. The lookahead for the last real code (before
-     * block was thus its length plus what we have just sent.
+     * the EOB of the previous block) was thus at least one plus the length
+     * of the EOB plus what we have just sent of the empty static block.
     */
-    if (s->last_eob_len + 10 - s->bi_valid < 9) {
+    if (1 + s->last_eob_len + 10 - s->bi_valid < 9) {
        send_bits(s, STATIC_TREES<<1, 3);
        send_code(s, END_BLOCK, static_ltree);
        s->compressed_len += 10L;
@@ -829,44 +835,52 @@ void ct_align(s)
 * trees or store, and output the encoded block to the zip file. This function
 * returns the total compressed length for the file so far.
 */
-ulg ct_flush_block(s, buf, stored_len, eof)
+ulg _tr_flush_block(s, buf, stored_len, eof)
    deflate_state *s;
    charf *buf;       /* input block, or NULL if too old */
    ulg stored_len;   /* length of input block */
    int eof;          /* true if this is the last block for a file */
 {
    ulg opt_lenb, static_lenb; /* opt_len and static_len in bytes */
-    int max_blindex;  /* index of last bit length code of non zero freq */
+    int max_blindex = 0;  /* index of last bit length code of non zero freq */
-     /* Check if the file is ascii or binary */
+    /* Build the Huffman trees unless a stored block is forced */
-    if (s->data_type == UNKNOWN) set_data_type(s);
+    if (s->level > 0) {
-    /* Construct the literal and distance trees */
+	 /* Check if the file is ascii or binary */
-    build_tree(s, (tree_desc *)(&(s->l_desc)));
+	if (s->data_type == Z_UNKNOWN) set_data_type(s);
-    Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
-            s->static_len));
-    build_tree(s, (tree_desc *)(&(s->d_desc)));
+	/* Construct the literal and distance trees */
-    Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
+	build_tree(s, (tree_desc *)(&(s->l_desc)));
-            s->static_len));
+	Tracev((stderr, "\nlit data: dyn %ld, stat %ld", s->opt_len,
-    /* At this point, opt_len and static_len are the total bit lengths of
+		s->static_len));
-     * the compressed block data, excluding the tree representations.
-     */
-    /* Build the bit length tree for the above two trees, and get the index
+	build_tree(s, (tree_desc *)(&(s->d_desc)));
-     * in bl_order of the last bit length code to send.
+	Tracev((stderr, "\ndist data: dyn %ld, stat %ld", s->opt_len,
-     */
+		s->static_len));
-    max_blindex = build_bl_tree(s);
+	/* At this point, opt_len and static_len are the total bit lengths of
+	 * the compressed block data, excluding the tree representations.
+	 */
-    /* Determine the best encoding. Compute first the block length in bytes */
+	/* Build the bit length tree for the above two trees, and get the index
-    opt_lenb = (s->opt_len+3+7)>>3;
+	 * in bl_order of the last bit length code to send.
-    static_lenb = (s->static_len+3+7)>>3;
+	 */
+	max_blindex = build_bl_tree(s);
-    Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
+	/* Determine the best encoding. Compute first the block length in bytes*/
-            opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
+	opt_lenb = (s->opt_len+3+7)>>3;
-            s->last_lit));
+	static_lenb = (s->static_len+3+7)>>3;
-    if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
+	Tracev((stderr, "\nopt %lu(%lu) stat %lu(%lu) stored %lu lit %u ",
+		opt_lenb, s->opt_len, static_lenb, s->static_len, stored_len,
+		s->last_lit));
+	if (static_lenb <= opt_lenb) opt_lenb = static_lenb;
+    } else {
+        Assert(buf != (char*)0, "lost buf");
+	opt_lenb = static_lenb = stored_len + 5; /* force a stored block */
+    }
    /* If compression failed and this is the first and last block,
     * and if the .zip file can be seeked (to rewrite the local header),
@@ -874,7 +888,7 @@ ulg ct_flush_block(s, buf, stored_len, eof)
     */
 #ifdef STORED_FILE_OK
 #  ifdef FORCE_STORED_FILE
-    if (eof && compressed_len == 0L) { /* force stored file */
+    if (eof && s->compressed_len == 0L) { /* force stored file */
 #  else
    if (stored_len <= opt_lenb && eof && s->compressed_len==0L && seekable()) {
 #  endif
@@ -899,7 +913,7 @@ ulg ct_flush_block(s, buf, stored_len, eof)
         * successful. If LIT_BUFSIZE <= WSIZE, it is never too late to
         * transform a block into a stored block.
         */
-        ct_stored_block(s, buf, stored_len, eof);
+        _tr_stored_block(s, buf, stored_len, eof);
 #ifdef FORCE_STATIC
    } else if (static_lenb >= 0) { /* force static trees */
@@ -933,10 +947,10 @@ ulg ct_flush_block(s, buf, stored_len, eof)
 * Save the match info and tally the frequency counts. Return true if
 * the current block must be flushed.
 */
-int ct_tally (s, dist, lc)
+int _tr_tally (s, dist, lc)
    deflate_state *s;
-    int dist;  /* distance of matched string */
+    unsigned dist;  /* distance of matched string */
-    int lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
+    unsigned lc;    /* match length-MIN_MATCH or unmatched char (if dist==0) */
 {
    s->d_buf[s->last_lit] = (ush)dist;
    s->l_buf[s->last_lit++] = (uch)lc;
@@ -949,7 +963,7 @@ int ct_tally (s, dist, lc)
        dist--;             /* dist = match distance - 1 */
        Assert((ush)dist < (ush)MAX_DIST(s) &&
               (ush)lc <= (ush)(MAX_MATCH-MIN_MATCH) &&
-               (ush)d_code(dist) < (ush)D_CODES,  "ct_tally: bad match");
+               (ush)d_code(dist) < (ush)D_CODES,  "_tr_tally: bad match");
        s->dyn_ltree[length_code[lc]+LITERALS+1].Freq++;
        s->dyn_dtree[d_code(dist)].Freq++;
@@ -959,7 +973,7 @@ int ct_tally (s, dist, lc)
    if (s->level > 2 && (s->last_lit & 0xfff) == 0) {
        /* Compute an upper bound for the compressed length */
        ulg out_length = (ulg)s->last_lit*8L;
-        ulg in_length = (ulg)s->strstart - s->block_start;
+        ulg in_length = (ulg)((long)s->strstart - s->block_start);
        int dcode;
        for (dcode = 0; dcode < D_CODES; dcode++) {
            out_length += (ulg)s->dyn_dtree[dcode].Freq *
@@ -1043,7 +1057,7 @@ local void set_data_type(s)
    while (n < 7)        bin_freq += s->dyn_ltree[n++].Freq;
    while (n < 128)    ascii_freq += s->dyn_ltree[n++].Freq;
    while (n < LITERALS) bin_freq += s->dyn_ltree[n++].Freq;
-    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? BINARY : ASCII);
+    s->data_type = (Byte)(bin_freq > (ascii_freq >> 2) ? Z_BINARY : Z_ASCII);
 }
 /* ===========================================================================

--- a/uncompr.c
+++ b/uncompr.c
 /* uncompr.c -- decompress a memory buffer
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -25,13 +25,13 @@
 int uncompress (dest, destLen, source, sourceLen)
    Bytef *dest;
    uLongf *destLen;
-    Bytef *source;
+    const Bytef *source;
    uLong sourceLen;
 {
    z_stream stream;
    int err;
-    stream.next_in = source;
+    stream.next_in = (Bytef*)source;
    stream.avail_in = (uInt)sourceLen;
    /* Check for source > 64K on 16-bit machine: */
    if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;

--- a/zconf.h
+++ b/zconf.h
 /* zconf.h -- configuration of the zlib compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -9,22 +9,55 @@
 #define _ZCONF_H
 /*
-     The library does not install any signal handler. It is recommended to
+ * People prefering a unique prefix for all types and library functions
-  add at least a handler for SIGSEGV when decompressing; the library checks
+ * should compile with -DZ_PREFIX
-  the consistency of the input data whenever possible but may go nuts
-  for some forms of corrupted input.
 */
+#ifdef Z_PREFIX
+#  define deflateInit_	z_deflateInit_
+#  define deflate	z_deflate
+#  define deflateEnd	z_deflateEnd
+#  define inflateInit_ 	z_inflateInit_
+#  define inflate	z_inflate
+#  define inflateEnd	z_inflateEnd
+#  define deflateInit2_	z_deflateInit2_
+#  define deflateCopy	z_deflateCopy
+#  define deflateReset	z_deflateReset
+#  define deflateParams	z_deflateParams
+#  define inflateInit2_	z_inflateInit2_
+#  define inflateSync	z_inflateSync
+#  define inflateReset	z_inflateReset
+#  define compress	z_compress
+#  define uncompress	z_uncompress
+#  define adler32	z_adler32
+#  define crc32		z_crc32
+#  define get_crc_table z_get_crc_table
+#  define Byte		z_Byte
+#  define uInt		z_uInt
+#  define uLong		z_uLong
+#  define Bytef		z_Bytef
+#  define charf		z_charf
+#  define intf		z_intf
+#  define uIntf		z_uIntf
+#  define uLongf	z_uLongf
+#  define voidpf	z_voidpf
+#  define voidp		z_voidp
+#endif
-/*
+#if (defined(_WIN32) || defined(__WIN32__)) && !defined(WIN32)
- * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
+#  define WIN32
- * than 64k bytes at a time (needed on systems with 16-bit int).
+#endif
- */
+#if (defined(__GNUC__) || defined(WIN32)) && !defined(__32BIT__)
-#if defined(_GNUC__) && !defined(__32BIT__)
 #  define __32BIT__
 #endif
 #if defined(__MSDOS__) && !defined(MSDOS)
 #  define MSDOS
 #endif
+/*
+ * Compile with -DMAXSEG_64K if the alloc function cannot allocate more
+ * than 64k bytes at a time (needed on systems with 16-bit int).
+ */
 #if defined(MSDOS) && !defined(__32BIT__)
 #  define MAXSEG_64K
 #endif
@@ -32,20 +65,20 @@
 #  define UNALIGNED_OK
 #endif
-#ifndef STDC
+#if (defined(MSDOS) || defined(_WINDOWS) || defined(WIN32))  && !defined(STDC)
-#  if defined(MSDOS) || defined(__STDC__) || defined(__cplusplus)
+#  define STDC
-#    define STDC
+#endif
-#  endif
+#if (defined(__STDC__) || defined(__cplusplus)) && !defined(STDC)
+#  define STDC
 #endif
-#ifndef STDC
+#if !defined(STDC) && !defined(const)
-#  ifndef const
+#  define const
-#    define const
-#  endif
 #endif
 #ifdef	__MWERKS__ /* Metrowerks CodeWarrior declares fileno() in unix.h */
 #  include <unix.h>
+#  define Byte _Byte /* Byte already used on Mac */
 #endif
 /* Maximum value for memLevel in deflateInit2 */
@@ -92,6 +125,7 @@
 * just define FAR to be empty.
 */
 #if defined(M_I86SM) || defined(M_I86MM) /* MSC small or medium model */
+#  define SMALL_MEDIUM
 #  ifdef _MSC_VER
 #    define FAR __far
 #  else
@@ -99,20 +133,26 @@
 #  endif
 #endif
 #if defined(__BORLANDC__) && (defined(__SMALL__) || defined(__MEDIUM__))
-#    define FAR __far /* completely untested, just a best guess */
+#    define SMALL_MEDIUM
+#    define FAR __far
 #endif
 #ifndef FAR
 #   define FAR
 #endif
+/* The Watcom compiler defines M_I86SM and __SMALL__ even in 32 bit mode */
+#if defined(__WATCOMC__) && defined(__386__)
+#  undef FAR
+#  undef SMALL_MEDIUM
+#endif
 typedef unsigned char  Byte;  /* 8 bits */
 typedef unsigned int   uInt;  /* 16 bits or more */
 typedef unsigned long  uLong; /* 32 bits or more */
-typedef Byte FAR Bytef;
+typedef Byte  FAR Bytef;
-typedef char FAR charf;
+typedef char  FAR charf;
-typedef int FAR intf;
+typedef int   FAR intf;
-typedef uInt FAR uIntf;
+typedef uInt  FAR uIntf;
 typedef uLong FAR uLongf;
 #ifdef STDC

--- a/zlib.h
+++ b/zlib.h
--- a/zutil.c
+++ b/zutil.c
 /* zutil.c -- target dependent utility functions for the compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */
@@ -11,20 +11,22 @@
 struct internal_state      {int dummy;}; /* for buggy compilers */
-#ifndef __GO32__
+#ifndef STDC
 extern void exit OF((int));
 #endif
-char *zlib_version = ZLIB_VERSION;
+const char *zlib_version = ZLIB_VERSION;
-char *z_errmsg[] = {
+const char *z_errmsg[10] = {
-"stream end",          /* Z_STREAM_END    1 */
+"need dictionary",     /* Z_NEED_DICT       2  */
-"",                    /* Z_OK            0 */
+"stream end",          /* Z_STREAM_END      1  */
-"file error",          /* Z_ERRNO        (-1) */
+"",                    /* Z_OK              0  */
-"stream error",        /* Z_STREAM_ERROR (-2) */
+"file error",          /* Z_ERRNO         (-1) */
-"data error",          /* Z_DATA_ERROR   (-3) */
+"stream error",        /* Z_STREAM_ERROR  (-2) */
-"insufficient memory", /* Z_MEM_ERROR    (-4) */
+"data error",          /* Z_DATA_ERROR    (-3) */
-"buffer error",        /* Z_BUF_ERROR    (-5) */
+"insufficient memory", /* Z_MEM_ERROR     (-4) */
+"buffer error",        /* Z_BUF_ERROR     (-5) */
+"incompatible version",/* Z_VERSION_ERROR (-6) */
 ""};
@@ -59,9 +61,10 @@ void zmemzero(dest, len)
 }
 #endif
-#if defined( __TURBOC__) && !defined(__SMALL__) && !defined(__MEDIUM__)
+#ifdef __TURBOC__
-/* Small and medium model are for now limited to near allocation with
+#if (defined( __BORLANDC__) || !defined(SMALL_MEDIUM)) && !defined(__32BIT__)
- * reduced MAX_WBITS and MAX_MEM_LEVEL
+/* Small and medium model in Turbo C are for now limited to near allocation
+ * with reduced MAX_WBITS and MAX_MEM_LEVEL
 */
 #  define MY_ZCALLOC
@@ -94,7 +97,10 @@ voidpf zcalloc (voidpf opaque, unsigned items, unsigned size)
    voidpf buf = opaque; /* just to make some compilers happy */
    ulg bsize = (ulg)items*size;
-    if (bsize < 65536L) {
+    /* If we allocate less than 65520 bytes, we assume that farmalloc
+     * will return a usable pointer which doesn't have to be normalized.
+     */
+    if (bsize < 65520L) {
        buf = farmalloc(bsize);
        if (*(ush*)&buf != 0) return buf;
    } else {
@@ -131,9 +137,11 @@ void  zcfree (voidpf opaque, voidpf ptr)
    ptr = opaque; /* just to make some compilers happy */
    z_error("zcfree: ptr not found");
 }
+#endif
 #endif /* __TURBOC__ */
-#if defined(M_I86SM)||defined(M_I86MM)||defined(M_I86CM)||defined(M_I86LM)
+#if defined(M_I86) && !(defined(__WATCOMC__) && defined(__386__))
 /* Microsoft C */
 #  define MY_ZCALLOC
@@ -160,7 +168,7 @@ void  zcfree (voidpf opaque, voidpf ptr)
 #ifndef MY_ZCALLOC /* Any system without a special alloc function */
-#ifndef __GO32__
+#ifndef STDC
 extern voidp  calloc OF((uInt items, uInt size));
 extern void   free   OF((voidpf ptr));
 #endif
@@ -170,6 +178,7 @@ voidpf zcalloc (opaque, items, size)
    unsigned items;
    unsigned size;
 {
+    if (opaque) opaque = 0; /* to make compiler happy */
    return (voidpf)calloc(items, size);
 }
@@ -177,6 +186,7 @@ void  zcfree (opaque, ptr)
    voidpf opaque;
    voidpf ptr;
 {
+    if (opaque) opaque = 0; /* to make compiler happy */
    free(ptr);
 }

--- a/zutil.h
+++ b/zutil.h
 /* zutil.h -- internal interface and configuration of the compression library
- * Copyright (C) 1995 Jean-loup Gailly.
+ * Copyright (C) 1995-1996 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h
 */
@@ -15,7 +15,7 @@
 #include "zlib.h"
-#if defined(MSDOS) || defined(VMS)
+#if defined(MSDOS) || defined(VMS) || defined(CRAY) || defined(WIN32)
 #   include <stddef.h>
 #   include <errno.h>
 #else
@@ -23,6 +23,7 @@
 #endif
 #ifdef STDC
 #  include <string.h>
+#  include <stdlib.h>
 #endif
 #ifndef local
@@ -36,15 +37,17 @@ typedef unsigned short ush;
 typedef ush FAR ushf;
 typedef unsigned long  ulg;
-extern char *z_errmsg[]; /* indexed by 1-zlib_error */
+extern const char *z_errmsg[10]; /* indexed by 2-zlib_error */
+/* (size given to avoid silly warnings with Visual C++) */
-#define ERR_RETURN(strm,err) return (strm->msg=z_errmsg[1-err], err)
+#define ERR_MSG(err) (char*)z_errmsg[Z_NEED_DICT-(err)]
+#define ERR_RETURN(strm,err) \
+  return (strm->msg = ERR_MSG(err), (err))
 /* To be used only when the state is known to be valid */
        /* common constants */
-#define DEFLATED   8
 #ifndef DEF_WBITS
 #  define DEF_WBITS MAX_WBITS
 #endif
@@ -66,6 +69,8 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #define MAX_MATCH  258
 /* The minimum and maximum match lengths */
+#define PRESET_DICT 0x20 /* preset dictionary flag in zlib header */
        /* target dependencies */
 #ifdef MSDOS
@@ -81,7 +86,7 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define OS_CODE  0x06
 #endif
-#ifdef WIN32 /* Windows NT */
+#ifdef WIN32 /* Window 95 & Windows NT */
 #  define OS_CODE  0x0b
 #endif
@@ -143,11 +148,13 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #  define HAVE_MEMCPY
 #endif
 #ifdef HAVE_MEMCPY
-#  if defined(M_I86SM) || defined(M_I86MM) /* MSC small or medium model */
+#  ifdef SMALL_MEDIUM /* MSDOS small or medium model */
 #    define zmemcpy _fmemcpy
+#    define zmemcmp _fmemcmp
 #    define zmemzero(dest, len) _fmemset(dest, 0, len)
 #  else
 #    define zmemcpy memcpy
+#    define zmemcmp memcmp
 #    define zmemzero(dest, len) memset(dest, 0, len)
 #  endif
 #else
@@ -177,7 +184,7 @@ extern char *z_errmsg[]; /* indexed by 1-zlib_error */
 #endif
-typedef uLong (*check_func) OF((uLong check, Bytef *buf, uInt len));
+typedef uLong (*check_func) OF((uLong check, const Bytef *buf, uInt len));
 extern void z_error    OF((char *m));