+++ /dev/null
-
- 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 Løvset <Tyge.Lovset@cmr.no>
- Another C++ I/O streams interface
- contrib/untgz/ by "Pedro A. Aranda Guti\irrez" <paag@tid.es>
- A very simple tar.gz file extractor using zlib
- contrib/visual-basic.txt by Carlos Rios <c_rios@sonda.cl>
- How to use compress(), uncompress() and the gz* functions from VB.
-- pass params -f (filtered data), -h (huffman only), -1 to -9 (compression
- level) in minigzip (thanks to Tom Lane)
-
-- use const for rommable constants in deflate
-- added test for gzseek and gztell in example.c
-- add undocumented function inflateSyncPoint() (hack for Paul Mackerras)
-- add undocumented function zError to convert error code to string
- (for Tim Smithers)
-- Allow compilation of gzio with -DNO_DEFLATE to avoid the compression code.
-- Use default memcpy for Symantec MSDOS compiler.
-- Add EXPORT keyword for check_func (needed for Windows DLL)
-- add current directory to LD_LIBRARY_PATH for "make test"
-- create also a link for libz.so.1
-- added support for FUJITSU UXP/DS (thanks to Toshiaki Nomura)
-- use $(SHAREDLIB) instead of libz.so in Makefile.in (for HPUX)
-- added -soname for Linux in configure (Chun-Chung Chen,
-- assign numbers to the exported functions in zlib.def (for Windows DLL)
-- add advice in zlib.h for best usage of deflateSetDictionary
-- work around compiler bug on Atari (cast Z_NULL in call of s->checkfn)
-- allow compilation with ANSI keywords only enabled for TurboC in large model
-- avoid "versionString"[0] (Borland bug)
-- add NEED_DUMMY_RETURN for Borland
-- use variable z_verbose for tracing in debug mode (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 $Id$. 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()
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