ChangeLog
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- ChangeLog file for zlib
- Changes in 1.1.4 (11 March 2002)
- - ZFREE was repeated on same allocation on some error conditions.
- This creates a security problem described in
- http://www.zlib.org/advisory-2002-03-11.txt
- - Returned incorrect error (Z_MEM_ERROR) on some invalid data
- - Avoid accesses before window for invalid distances with inflate window
- less than 32K.
- - force windowBits > 8 to avoid a bug in the encoder for a window size
- of 256 bytes. (A complete fix will be available in 1.1.5).
-
- Changes in 1.1.3 (9 July 1998)
- - fix "an inflate input buffer bug that shows up on rare but persistent
- occasions" (Mark)
- - fix gzread and gztell for concatenated .gz files (Didier Le Botlan)
- - fix gzseek(..., SEEK_SET) in write mode
- - fix crc check after a gzeek (Frank Faubert)
- - fix miniunzip when the last entry in a zip file is itself a zip file
- (J Lillge)
- - add contrib/asm586 and contrib/asm686 (Brian Raiter)
- See http://www.muppetlabs.com/~breadbox/software/assembly.html
- - add support for Delphi 3 in contrib/delphi (Bob Dellaca)
- - add support for C++Builder 3 and Delphi 3 in contrib/delphi2 (Davide Moretti)
- - do not exit prematurely in untgz if 0 at start of block (Magnus Holmgren)
- - use macro EXTERN instead of extern to support DLL for BeOS (Sander Stoks)
- - added a FAQ file
- - Support gzdopen on Mac with Metrowerks (Jason Linhart)
- - Do not redefine Byte on Mac (Brad Pettit & Jason Linhart)
- - define SEEK_END too if SEEK_SET is not defined (Albert Chin-A-Young)
- - avoid some warnings with Borland C (Tom Tanner)
- - fix a problem in contrib/minizip/zip.c for 16-bit MSDOS (Gilles Vollant)
- - emulate utime() for WIN32 in contrib/untgz (Gilles Vollant)
- - allow several arguments to configure (Tim Mooney, Frodo Looijaard)
- - use libdir and includedir in Makefile.in (Tim Mooney)
- - support shared libraries on OSF1 V4 (Tim Mooney)
- - remove so_locations in "make clean" (Tim Mooney)
- - fix maketree.c compilation error (Glenn, Mark)
- - Python interface to zlib now in Python 1.5 (Jeremy Hylton)
- - new Makefile.riscos (Rich Walker)
- - initialize static descriptors in trees.c for embedded targets (Nick Smith)
- - use "foo-gz" in example.c for RISCOS and VMS (Nick Smith)
- - add the OS/2 files in Makefile.in too (Andrew Zabolotny)
- - fix fdopen and halloc macros for Microsoft C 6.0 (Tom Lane)
- - fix maketree.c to allow clean compilation of inffixed.h (Mark)
- - fix parameter check in deflateCopy (Gunther Nikl)
- - cleanup trees.c, use compressed_len only in debug mode (Christian Spieler)
- - Many portability patches by Christian Spieler:
- . zutil.c, zutil.h: added "const" for zmem*
- . Make_vms.com: fixed some typos
- . Make_vms.com: msdos/Makefile.*: removed zutil.h from some dependency lists
- . msdos/Makefile.msc: remove "default rtl link library" info from obj files
- . msdos/Makefile.*: use model-dependent name for the built zlib library
- . msdos/Makefile.emx, nt/Makefile.emx, nt/Makefile.gcc:
- new makefiles, for emx (DOS/OS2), emx&rsxnt and mingw32 (Windows 9x / NT)
- - use define instead of typedef for Bytef also for MSC small/medium (Tom Lane)
- - replace __far with _far for better portability (Christian Spieler, Tom Lane)
- - fix test for errno.h in configure (Tim Newsham)
- Changes in 1.1.2 (19 March 98)
- - added contrib/minzip, mini zip and unzip based on zlib (Gilles Vollant)
- See http://www.winimage.com/zLibDll/unzip.html
- - preinitialize the inflate tables for fixed codes, to make the code
- completely thread safe (Mark)
- - some simplifications and slight speed-up to the inflate code (Mark)
- - fix gzeof on non-compressed files (Allan Schrum)
- - add -std1 option in configure for OSF1 to fix gzprintf (Martin Mokrejs)
- - use default value of 4K for Z_BUFSIZE for 16-bit MSDOS (Tim Wegner + Glenn)
- - added os2/Makefile.def and os2/zlib.def (Andrew Zabolotny)
- - add shared lib support for UNIX_SV4.2MP (MATSUURA Takanori)
- - do not wrap extern "C" around system includes (Tom Lane)
- - mention zlib binding for TCL in README (Andreas Kupries)
- - added amiga/Makefile.pup for Amiga powerUP SAS/C PPC (Andreas Kleinert)
- - allow "make install prefix=..." even after configure (Glenn Randers-Pehrson)
- - allow "configure --prefix $HOME" (Tim Mooney)
- - remove warnings in example.c and gzio.c (Glenn Randers-Pehrson)
- - move Makefile.sas to amiga/Makefile.sas
- Changes in 1.1.1 (27 Feb 98)
- - fix macros _tr_tally_* in deflate.h for debug mode (Glenn Randers-Pehrson)
- - remove block truncation heuristic which had very marginal effect for zlib
- (smaller lit_bufsize than in gzip 1.2.4) and degraded a little the
- compression ratio on some files. This also allows inlining _tr_tally for
- matches in deflate_slow.
- - added msdos/Makefile.w32 for WIN32 Microsoft Visual C++ (Bob Frazier)
- Changes in 1.1.0 (24 Feb 98)
- - do not return STREAM_END prematurely in inflate (John Bowler)
- - revert to the zlib 1.0.8 inflate to avoid the gcc 2.8.0 bug (Jeremy Buhler)
- - compile with -DFASTEST to get compression code optimized for speed only
- - in minigzip, try mmap'ing the input file first (Miguel Albrecht)
- - increase size of I/O buffers in minigzip.c and gzio.c (not a big gain
- on Sun but significant on HP)
- - add a pointer to experimental unzip library in README (Gilles Vollant)
- - initialize variable gcc in configure (Chris Herborth)
- Changes in 1.0.9 (17 Feb 1998)
- - added gzputs and gzgets functions
- - do not clear eof flag in gzseek (Mark Diekhans)
- - fix gzseek for files in transparent mode (Mark Diekhans)
- - do not assume that vsprintf returns the number of bytes written (Jens Krinke)
- - replace EXPORT with ZEXPORT to avoid conflict with other programs
- - added compress2 in zconf.h, zlib.def, zlib.dnt
- - new asm code from Gilles Vollant in contrib/asm386
- - simplify the inflate code (Mark):
- . Replace ZALLOC's in huft_build() with single ZALLOC in inflate_blocks_new()
- . ZALLOC the length list in inflate_trees_fixed() instead of using stack
- . ZALLOC the value area for huft_build() instead of using stack
- . Simplify Z_FINISH check in inflate()
- - Avoid gcc 2.8.0 comparison bug a little differently than zlib 1.0.8
- - in inftrees.c, avoid cc -O bug on HP (Farshid Elahi)
- - in zconf.h move the ZLIB_DLL stuff earlier to avoid problems with
- the declaration of FAR (Gilles VOllant)
- - install libz.so* with mode 755 (executable) instead of 644 (Marc Lehmann)
- - read_buf buf parameter of type Bytef* instead of charf*
- - zmemcpy parameters are of type Bytef*, not charf* (Joseph Strout)
- - do not redeclare unlink in minigzip.c for WIN32 (John Bowler)
- - fix check for presence of directories in "make install" (Ian Willis)
- Changes in 1.0.8 (27 Jan 1998)
- - fixed offsets in contrib/asm386/gvmat32.asm (Gilles Vollant)
- - fix gzgetc and gzputc for big endian systems (Markus Oberhumer)
- - added compress2() to allow setting the compression level
- - include sys/types.h to get off_t on some systems (Marc Lehmann & QingLong)
- - use constant arrays for the static trees in trees.c instead of computing
- them at run time (thanks to Ken Raeburn for this suggestion). To create
- trees.h, compile with GEN_TREES_H and run "make test".
- - check return code of example in "make test" and display result
- - pass minigzip command line options to file_compress
- - simplifying code of inflateSync to avoid gcc 2.8 bug
- - support CC="gcc -Wall" in configure -s (QingLong)
- - avoid a flush caused by ftell in gzopen for write mode (Ken Raeburn)
- - fix test for shared library support to avoid compiler warnings
- - zlib.lib -> zlib.dll in msdos/zlib.rc (Gilles Vollant)
- - check for TARGET_OS_MAC in addition to MACOS (Brad Pettit)
- - do not use fdopen for Metrowerks on Mac (Brad Pettit))
- - add checks for gzputc and gzputc in example.c
- - avoid warnings in gzio.c and deflate.c (Andreas Kleinert)
- - use const for the CRC table (Ken Raeburn)
- - fixed "make uninstall" for shared libraries
- - use Tracev instead of Trace in infblock.c
- - in example.c use correct compressed length for test_sync
- - suppress +vnocompatwarnings in configure for HPUX (not always supported)
- Changes in 1.0.7 (20 Jan 1998)
- - fix gzseek which was broken in write mode
- - return error for gzseek to negative absolute position
- - fix configure for Linux (Chun-Chung Chen)
- - increase stack space for MSC (Tim Wegner)
- - get_crc_table and inflateSyncPoint are EXPORTed (Gilles Vollant)
- - define EXPORTVA for gzprintf (Gilles Vollant)
- - added man page zlib.3 (Rick Rodgers)
- - for contrib/untgz, fix makedir() and improve Makefile
- - check gzseek in write mode in example.c
- - allocate extra buffer for seeks only if gzseek is actually called
- - avoid signed/unsigned comparisons (Tim Wegner, Gilles Vollant)
- - add inflateSyncPoint in zconf.h
- - fix list of exported functions in nt/zlib.dnt and mdsos/zlib.def
- Changes in 1.0.6 (19 Jan 1998)
- - add functions gzprintf, gzputc, gzgetc, gztell, gzeof, gzseek, gzrewind and
- gzsetparams (thanks to Roland Giersig and Kevin Ruland for some of this code)
- - Fix a deflate bug occuring only with compression level 0 (thanks to
- Andy Buckler for finding this one).
- - In minigzip, pass transparently also the first byte for .Z files.
- - return Z_BUF_ERROR instead of Z_OK if output buffer full in uncompress()
- - check Z_FINISH in inflate (thanks to Marc Schluper)
- - Implement deflateCopy (thanks to Adam Costello)
- - make static libraries by default in configure, add --shared option.
- - move MSDOS or Windows specific files to directory msdos
- - suppress the notion of partial flush to simplify the interface
- (but the symbol Z_PARTIAL_FLUSH is kept for compatibility with 1.0.4)
- - suppress history buffer provided by application to simplify the interface
- (this feature was not implemented anyway in 1.0.4)
- - next_in and avail_in must be initialized before calling inflateInit or
- inflateInit2
- - add EXPORT in all exported functions (for Windows DLL)
- - added Makefile.nt (thanks to Stephen Williams)
- - added the unsupported "contrib" directory:
- contrib/asm386/ by Gilles Vollant <info@winimage.com>
- 386 asm code replacing longest_match().
- contrib/iostream/ by Kevin Ruland <kevin@rodin.wustl.edu>
- A C++ I/O streams interface to the zlib gz* functions
- contrib/iostream2/ by Tyge L鴙set <Tyge.Lovset@cmr.no>
- Another C++ I/O streams interface
- contrib/untgz/ by "Pedro A. Aranda Gutiirrez" <paag@tid.es>
- A very simple tar.gz file extractor using zlib
- contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
- How to use compress(), uncompress() and the gz* functions from VB.
- - pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
- level) in minigzip (thanks to Tom Lane)
- - use const for rommable constants in deflate
- - added test for gzseek and gztell in example.c
- - add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
- - add undocumented function zError to convert error code to string
- (for Tim Smithers)
- - Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
- - Use default memcpy for Symantec MSDOS compiler.
- - Add EXPORT keyword for check_func (needed for Windows DLL)
- - add current directory to LD_LIBRARY_PATH for "make test"
- - create also a link for libz.so.1
- - added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
- - use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
- - added -soname for Linux in configure (Chun-Chung Chen,
- - assign numbers to the exported functions in zlib.def (for Windows DLL)
- - add advice in zlib.h for best usage of deflateSetDictionary
- - work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
- - allow compilation with ANSI keywords only enabled for TurboC in large model
- - avoid "versionString"[0] (Borland bug)
- - add NEED_DUMMY_RETURN for Borland
- - use variable z_verbose for tracing in debug mode (L. Peter Deutsch).
- - allow compilation with CC
- - defined STDC for OS/2 (David Charlap)
- - limit external names to 8 chars for MVS (Thomas Lund)
- - in minigzip.c, use static buffers only for 16-bit systems
- - fix suffix check for "minigzip -d foo.gz"
- - do not return an error for the 2nd of two consecutive gzflush() (Felix Lee)
- - use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau)
- - added makelcc.bat for lcc-win32 (Tom St Denis)
- - in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe)
- - Avoid expanded $Id: ChangeLog,v 1.1.1.1 2002/10/18 01:43:40 ping Exp $. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion.
- - check for unistd.h in configure (for off_t)
- - remove useless check parameter in inflate_blocks_free
- - avoid useless assignment of s->check to itself in inflate_blocks_new
- - do not flush twice in gzclose (thanks to Ken Raeburn)
- - rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h
- - use NO_ERRNO_H instead of enumeration of operating systems with errno.h
- - work around buggy fclose on pipes for HP/UX
- - support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson)
- - fix configure if CC is already equal to gcc
- Changes in 1.0.5 (3 Jan 98)
- - Fix inflate to terminate gracefully when fed corrupted or invalid data
- - Use const for rommable constants in inflate
- - Eliminate memory leaks on error conditions in inflate
- - Removed some vestigial code in inflate
- - Update web address in README
-
- Changes in 1.0.4 (24 Jul 96)
- - In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF
- bit, so the decompressor could decompress all the correct data but went
- on to attempt decompressing extra garbage data. This affected minigzip too.
- - zlibVersion and gzerror return const char* (needed for DLL)
- - port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno)
- - use z_error only for DEBUG (avoid problem with DLLs)
- Changes in 1.0.3 (2 Jul 96)
- - use z_streamp instead of z_stream *, which is now a far pointer in MSDOS
- small and medium models; this makes the library incompatible with previous
- versions for these models. (No effect in large model or on other systems.)
- - return OK instead of BUF_ERROR if previous deflate call returned with
- avail_out as zero but there is nothing to do
- - added memcmp for non STDC compilers
- - define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly)
- - define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO)
- - better check for 16-bit mode MSC (avoids problem with Symantec)
- Changes in 1.0.2 (23 May 96)
- - added Windows DLL support
- - added a function zlibVersion (for the DLL support)
- - fixed declarations using Bytef in infutil.c (pb with MSDOS medium model)
- - Bytef is define's instead of typedef'd only for Borland C
- - avoid reading uninitialized memory in example.c
- - mention in README that the zlib format is now RFC1950
- - updated Makefile.dj2
- - added algorithm.doc
- Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion]
- - fix array overlay in deflate.c which sometimes caused bad compressed data
- - fix inflate bug with empty stored block
- - fix MSDOS medium model which was broken in 0.99
- - fix deflateParams() which could generated bad compressed data.
- - Bytef is define'd instead of typedef'ed (work around Borland bug)
- - added an INDEX file
- - new makefiles for DJGPP (Makefile.dj2), 32-bit Borland (Makefile.b32),
- Watcom (Makefile.wat), Amiga SAS/C (Makefile.sas)
- - speed up adler32 for modern machines without auto-increment
- - added -ansi for IRIX in configure
- - static_init_done in trees.c is an int
- - define unlink as delete for VMS
- - fix configure for QNX
- - add configure branch for SCO and HPUX
- - avoid many warnings (unused variables, dead assignments, etc...)
- - no fdopen for BeOS
- - fix the Watcom fix for 32 bit mode (define FAR as empty)
- - removed redefinition of Byte for MKWERKS
- - work around an MWKERKS bug (incorrect merge of all .h files)
- Changes in 0.99 (27 Jan 96)
- - allow preset dictionary shared between compressor and decompressor
- - allow compression level 0 (no compression)
- - add deflateParams in zlib.h: allow dynamic change of compression level
- and compression strategy.
- - test large buffers and deflateParams in example.c
- - add optional "configure" to build zlib as a shared library
- - suppress Makefile.qnx, use configure instead
- - fixed deflate for 64-bit systems (detected on Cray)
- - fixed inflate_blocks for 64-bit systems (detected on Alpha)
- - declare Z_DEFLATED in zlib.h (possible parameter for deflateInit2)
- - always return Z_BUF_ERROR when deflate() has nothing to do
- - deflateInit and inflateInit are now macros to allow version checking
- - prefix all global functions and types with z_ with -DZ_PREFIX
- - make falloc completely reentrant (inftrees.c)
- - fixed very unlikely race condition in ct_static_init
- - free in reverse order of allocation to help memory manager
- - use zlib-1.0/* instead of zlib/* inside the tar.gz
- - make zlib warning-free with "gcc -O3 -Wall -Wwrite-strings -Wpointer-arith
- -Wconversion -Wstrict-prototypes -Wmissing-prototypes"
- - allow gzread on concatenated .gz files
- - deflateEnd now returns Z_DATA_ERROR if it was premature
- - deflate is finally (?) fully deterministic (no matches beyond end of input)
- - Document Z_SYNC_FLUSH
- - add uninstall in Makefile
- - Check for __cpluplus in zlib.h
- - Better test in ct_align for partial flush
- - avoid harmless warnings for Borland C++
- - initialize hash_head in deflate.c
- - avoid warning on fdopen (gzio.c) for HP cc -Aa
- - include stdlib.h for STDC compilers
- - include errno.h for Cray
- - ignore error if ranlib doesn't exist
- - call ranlib twice for NeXTSTEP
- - use exec_prefix instead of prefix for libz.a
- - renamed ct_* as _tr_* to avoid conflict with applications
- - clear z->msg in inflateInit2 before any error return
- - initialize opaque in example.c, gzio.c, deflate.c and inflate.c
- - fixed typo in zconf.h (_GNUC__ => __GNUC__)
- - check for WIN32 in zconf.h and zutil.c (avoid farmalloc in 32-bit mode)
- - fix typo in Make_vms.com (f$trnlnm -> f$getsyi)
- - in fcalloc, normalize pointer if size > 65520 bytes
- - don't use special fcalloc for 32 bit Borland C++
- - use STDC instead of __GO32__ to avoid redeclaring exit, calloc, etc...
- - use Z_BINARY instead of BINARY
- - document that gzclose after gzdopen will close the file
- - allow "a" as mode in gzopen.
- - fix error checking in gzread
- - allow skipping .gz extra-field on pipes
- - added reference to Perl interface in README
- - put the crc table in FAR data (I dislike more and more the medium model :)
- - added get_crc_table
- - added a dimension to all arrays (Borland C can't count).
- - workaround Borland C bug in declaration of inflate_codes_new & inflate_fast
- - guard against multiple inclusion of *.h (for precompiled header on Mac)
- - Watcom C pretends to be Microsoft C small model even in 32 bit mode.
- - don't use unsized arrays to avoid silly warnings by Visual C++:
- warning C4746: 'inflate_mask' : unsized array treated as '__far'
- (what's wrong with far data in far model?).
- - define enum out of inflate_blocks_state to allow compilation with C++
- Changes in 0.95 (16 Aug 95)
- - fix MSDOS small and medium model (now easier to adapt to any compiler)
- - inlined send_bits
- - fix the final (:-) bug for deflate with flush (output was correct but
- not completely flushed in rare occasions).
- - default window size is same for compression and decompression
- (it's now sufficient to set MAX_WBITS in zconf.h).
- - voidp -> voidpf and voidnp -> voidp (for consistency with other
- typedefs and because voidnp was not near in large model).
- Changes in 0.94 (13 Aug 95)
- - support MSDOS medium model
- - fix deflate with flush (could sometimes generate bad output)
- - fix deflateReset (zlib header was incorrectly suppressed)
- - added support for VMS
- - allow a compression level in gzopen()
- - gzflush now calls fflush
- - For deflate with flush, flush even if no more input is provided.
- - rename libgz.a as libz.a
- - avoid complex expression in infcodes.c triggering Turbo C bug
- - work around a problem with gcc on Alpha (in INSERT_STRING)
- - don't use inline functions (problem with some gcc versions)
- - allow renaming of Byte, uInt, etc... with #define.
- - avoid warning about (unused) pointer before start of array in deflate.c
- - avoid various warnings in gzio.c, example.c, infblock.c, adler32.c, zutil.c
- - avoid reserved word 'new' in trees.c
- Changes in 0.93 (25 June 95)
- - temporarily disable inline functions
- - make deflate deterministic
- - give enough lookahead for PARTIAL_FLUSH
- - Set binary mode for stdin/stdout in minigzip.c for OS/2
- - don't even use signed char in inflate (not portable enough)
- - fix inflate memory leak for segmented architectures
- Changes in 0.92 (3 May 95)
- - don't assume that char is signed (problem on SGI)
- - Clear bit buffer when starting a stored block
- - no memcpy on Pyramid
- - suppressed inftest.c
- - optimized fill_window, put longest_match inline for gcc
- - optimized inflate on stored blocks.
- - untabify all sources to simplify patches
- Changes in 0.91 (2 May 95)
- - Default MEM_LEVEL is 8 (not 9 for Unix) as documented in zlib.h
- - Document the memory requirements in zconf.h
- - added "make install"
- - fix sync search logic in inflateSync
- - deflate(Z_FULL_FLUSH) now works even if output buffer too short
- - after inflateSync, don't scare people with just "lo world"
- - added support for DJGPP
- Changes in 0.9 (1 May 95)
- - don't assume that zalloc clears the allocated memory (the TurboC bug
- was Mark's bug after all :)
- - let again gzread copy uncompressed data unchanged (was working in 0.71)
- - deflate(Z_FULL_FLUSH), inflateReset and inflateSync are now fully implemented
- - added a test of inflateSync in example.c
- - moved MAX_WBITS to zconf.h because users might want to change that.
- - document explicitly that zalloc(64K) on MSDOS must return a normalized
- pointer (zero offset)
- - added Makefiles for Microsoft C, Turbo C, Borland C++
- - faster crc32()
- Changes in 0.8 (29 April 95)
- - added fast inflate (inffast.c)
- - deflate(Z_FINISH) now returns Z_STREAM_END when done. Warning: this
- is incompatible with previous versions of zlib which returned Z_OK.
- - work around a TurboC compiler bug (bad code for b << 0, see infutil.h)
- (actually that was not a compiler bug, see 0.81 above)
- - gzread no longer reads one extra byte in certain cases
- - In gzio destroy(), don't reference a freed structure
- - avoid many warnings for MSDOS
- - avoid the ERROR symbol which is used by MS Windows
- Changes in 0.71 (14 April 95)
- - Fixed more MSDOS compilation problems :( There is still a bug with
- TurboC large model.
- Changes in 0.7 (14 April 95)
- - Added full inflate support.
- - Simplified the crc32() interface. The pre- and post-conditioning
- (one's complement) is now done inside crc32(). WARNING: this is
- incompatible with previous versions; see zlib.h for the new usage.
- Changes in 0.61 (12 April 95)
- - workaround for a bug in TurboC. example and minigzip now work on MSDOS.
- Changes in 0.6 (11 April 95)
- - added minigzip.c
- - added gzdopen to reopen a file descriptor as gzFile
- - added transparent reading of non-gziped files in gzread.
- - fixed bug in gzread (don't read crc as data)
- - fixed bug in destroy (gzio.c) (don't return Z_STREAM_END for gzclose).
- - don't allocate big arrays in the stack (for MSDOS)
- - fix some MSDOS compilation problems
- Changes in 0.5:
- - do real compression in deflate.c. Z_PARTIAL_FLUSH is supported but
- not yet Z_FULL_FLUSH.
- - support decompression but only in a single step (forced Z_FINISH)
- - added opaque object for zalloc and zfree.
- - added deflateReset and inflateReset
- - added a variable zlib_version for consistency checking.
- - renamed the 'filter' parameter of deflateInit2 as 'strategy'.
- Added Z_FILTERED and Z_HUFFMAN_ONLY constants.
- Changes in 0.4:
- - avoid "zip" everywhere, use zlib instead of ziplib.
- - suppress Z_BLOCK_FLUSH, interpret Z_PARTIAL_FLUSH as block flush
- if compression method == 8.
- - added adler32 and crc32
- - renamed deflateOptions as deflateInit2, call one or the other but not both
- - added the method parameter for deflateInit2.
- - added inflateInit2
- - simplied considerably deflateInit and inflateInit by not supporting
- user-provided history buffer. This is supported only in deflateInit2
- and inflateInit2.
- Changes in 0.3:
- - prefix all macro names with Z_
- - use Z_FINISH instead of deflateEnd to finish compression.
- - added Z_HUFFMAN_ONLY
- - added gzerror()