ChangeLog file for zlib 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 386 asm code replacing longest_match(). contrib/iostream/ by Kevin Ruland A C++ I/O streams interface to the zlib gz* functions contrib/iostream2/ by Tyge Løvset Another C++ I/O streams interface contrib/untgz/ by "Pedro A. Aranda Guti\irrez" A very simple tar.gz file extractor using zlib contrib/visual-basic.txt by Carlos Rios How to use compress(), uncompress() and the gz* functions from VB. - pass params -f (filtered data), -h (huffman only), -1 to -9 (compression level) in minigzip (thanks to Tom Lane) - use const for rommable constants in deflate - added test for gzseek and gztell in example.c - add undocumented function inflateSyncPoint() (hack for Paul Mackerras) - add undocumented function zError to convert error code to string (for Tim Smithers) - Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code. - Use default memcpy for Symantec MSDOS compiler. - Add EXPORT keyword for check_func (needed for Windows DLL) - add current directory to LD_LIBRARY_PATH for "make test" - create also a link for libz.so.1 - added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura) - use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX) - added -soname for Linux in configure (Chun-Chung Chen, - assign numbers to the exported functions in zlib.def (for Windows DLL) - add advice in zlib.h for best usage of deflateSetDictionary - work around compiler bug on Atari (cast Z_NULL in call of s->checkfn) - allow compilation with ANSI keywords only enabled for TurboC in large model - avoid "versionString"[0] (Borland bug) - add NEED_DUMMY_RETURN for Borland - use variable z_verbose for tracing in debug mode (Peter Deutsch). - allow compilation with CC - defined STDC for OS/2 (David Charlap) - limit external names to 8 chars for MVS (Thomas Lund) - in minigzip.c, use static buffers only for 16-bit systems - fix suffix check for "minigzip -d foo.gz" - do not return an error for the 2nd of two consecutive gzflush() (Felix Lee) - use _fdopen instead of fdopen for MSC >= 6.0 (Thomas Fanslau) - added makelcc.bat for lcc-win32 (Tom St Denis) - in Makefile.dj2, use copy and del instead of install and rm (Frank Donahoe) - Avoid expanded $Id$. Use "rcs -kb" or "cvs admin -kb" to avoid Id expansion. - check for unistd.h in configure (for off_t) - remove useless check parameter in inflate_blocks_free - avoid useless assignment of s->check to itself in inflate_blocks_new - do not flush twice in gzclose (thanks to Ken Raeburn) - rename FOPEN as F_OPEN to avoid clash with /usr/include/sys/file.h - use NO_ERRNO_H instead of enumeration of operating systems with errno.h - work around buggy fclose on pipes for HP/UX - support zlib DLL with BORLAND C++ 5.0 (thanks to Glenn Randers-Pehrson) - fix configure if CC is already equal to gcc Changes in 1.0.5 (3 Jan 98) - Fix inflate to terminate gracefully when fed corrupted or invalid data - Use const for rommable constants in inflate - Eliminate memory leaks on error conditions in inflate - Removed some vestigial code in inflate - Update web address in README Changes in 1.0.4 (24 Jul 96) - In very rare conditions, deflate(s, Z_FINISH) could fail to produce an EOF bit, so the decompressor could decompress all the correct data but went on to attempt decompressing extra garbage data. This affected minigzip too. - zlibVersion and gzerror return const char* (needed for DLL) - port to RISCOS (no fdopen, no multiple dots, no unlink, no fileno) - use z_error only for DEBUG (avoid problem with DLLs) Changes in 1.0.3 (2 Jul 96) - use z_streamp instead of z_stream *, which is now a far pointer in MSDOS small and medium models; this makes the library incompatible with previous versions for these models. (No effect in large model or on other systems.) - return OK instead of BUF_ERROR if previous deflate call returned with avail_out as zero but there is nothing to do - added memcmp for non STDC compilers - define NO_DUMMY_DECL for more Mac compilers (.h files merged incorrectly) - define __32BIT__ if __386__ or i386 is defined (pb. with Watcom and SCO) - better check for 16-bit mode MSC (avoids problem with Symantec) Changes in 1.0.2 (23 May 96) - added Windows DLL support - added a function zlibVersion (for the DLL support) - fixed declarations using Bytef in infutil.c (pb with MSDOS medium model) - Bytef is define's instead of typedef'd only for Borland C - avoid reading uninitialized memory in example.c - mention in README that the zlib format is now RFC1950 - updated Makefile.dj2 - added algorithm.doc Changes in 1.0.1 (20 May 96) [1.0 skipped to avoid confusion] - fix array overlay in deflate.c which sometimes caused bad compressed data - fix inflate bug with empty stored block - 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()