kc3-lang/zlib/ChangeLog

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• Author : Mark Adler
  Date : 2024-01-22 10:14:31
  Hash : 51b7f2ab
  Message : zlib 1.3.1

• ChangeLog

•                 ChangeLog file for zlib
  
  Changes in 1.3.1 (22 Jan 2024)
  - Reject overflows of zip header fields in minizip
  - Fix bug in inflateSync() for data held in bit buffer
  - Add LIT_MEM define to use more memory for a small deflate speedup
  - Fix decision on the emission of Zip64 end records in minizip
  - Add bounds checking to ERR_MSG() macro, used by zError()
  - Neutralize zip file traversal attacks in miniunz
  - Fix a bug in ZLIB_DEBUG compiles in check_match()
  - Various portability and appearance improvements
  
  Changes in 1.3 (18 Aug 2023)
  - Remove K&R function definitions and zlib2ansi
  - Fix bug in deflateBound() for level 0 and memLevel 9
  - Fix bug when gzungetc() is used immediately after gzopen()
  - Fix bug when using gzflush() with a very small buffer
  - Fix crash when gzsetparams() attempted for transparent write
  - Fix test/example.c to work with FORCE_STORED
  - Rewrite of zran in examples (see zran.c version history)
  - Fix minizip to allow it to open an empty zip file
  - Fix reading disk number start on zip64 files in minizip
  - Fix logic error in minizip argument processing
  - Add minizip testing to Makefile
  - Read multiple bytes instead of byte-by-byte in minizip unzip.c
  - Add memory sanitizer to configure (--memory)
  - Various portability improvements
  - Various documentation improvements
  - Various spelling and typo corrections
  
  Changes in 1.2.13 (13 Oct 2022)
  - Fix configure issue that discarded provided CC definition
  - Correct incorrect inputs provided to the CRC functions
  - Repair prototypes and exporting of new CRC functions
  - Fix inflateBack to detect invalid input with distances too far
  - Have infback() deliver all of the available output up to any error
  - Fix a bug when getting a gzip header extra field with inflate()
  - Fix bug in block type selection when Z_FIXED used
  - Tighten deflateBound bounds
  - Remove deleted assembler code references
  - Various portability and appearance improvements
  
  Changes in 1.2.12 (27 Mar 2022)
  - Cygwin does not have _wopen(), so do not create gzopen_w() there
  - Permit a deflateParams() parameter change as soon as possible
  - Limit hash table inserts after switch from stored deflate
  - Fix bug when window full in deflate_stored()
  - Fix CLEAR_HASH macro to be usable as a single statement
  - Avoid a conversion error in gzseek when off_t type too small
  - Have Makefile return non-zero error code on test failure
  - Avoid some conversion warnings in gzread.c and gzwrite.c
  - Update use of errno for newer Windows CE versions
  - Small speedup to inflate [psumbera]
  - Return an error if the gzputs string length can't fit in an int
  - Add address checking in clang to -w option of configure
  - Don't compute check value for raw inflate if asked to validate
  - Handle case where inflateSync used when header never processed
  - Avoid the use of ptrdiff_t
  - Avoid an undefined behavior of memcpy() in gzappend()
  - Avoid undefined behaviors of memcpy() in gz*printf()
  - Avoid an undefined behavior of memcpy() in _tr_stored_block()
  - Make the names in functions declarations identical to definitions
  - Remove old assembler code in which bugs have manifested
  - Fix deflateEnd() to not report an error at start of raw deflate
  - Add legal disclaimer to README
  - Emphasize the need to continue decompressing gzip members
  - Correct the initialization requirements for deflateInit2()
  - Fix a bug that can crash deflate on some input when using Z_FIXED
  - Assure that the number of bits for deflatePrime() is valid
  - Use a structure to make globals in enough.c evident
  - Use a macro for the printf format of big_t in enough.c
  - Clean up code style in enough.c, update version
  - Use inline function instead of macro for index in enough.c
  - Clarify that prefix codes are counted in enough.c
  - Show all the codes for the maximum tables size in enough.c
  - Add gznorm.c example, which normalizes gzip files
  - Fix the zran.c example to work on a multiple-member gzip file
  - Add tables for crc32_combine(), to speed it up by a factor of 200
  - Add crc32_combine_gen() and crc32_combine_op() for fast combines
  - Speed up software CRC-32 computation by a factor of 1.5 to 3
  - Use atomic test and set, if available, for dynamic CRC tables
  - Don't bother computing check value after successful inflateSync()
  - Correct comment in crc32.c
  - Add use of the ARMv8 crc32 instructions when requested
  - Use ARM crc32 instructions if the ARM architecture has them
  - Explicitly note that the 32-bit check values are 32 bits
  - Avoid adding empty gzip member after gzflush with Z_FINISH
  - Fix memory leak on error in gzlog.c
  - Fix error in comment on the polynomial representation of a byte
  - Clarify gz* function interfaces, referring to parameter names
  - Change macro name in inflate.c to avoid collision in VxWorks
  - Correct typo in blast.c
  - Improve portability of contrib/minizip
  - Fix indentation in minizip's zip.c
  - Replace black/white with allow/block. (theresa-m)
  - minizip warning fix if MAXU32 already defined. (gvollant)
  - Fix unztell64() in minizip to work past 4GB. (Daniël Hörchner)
  - Clean up minizip to reduce warnings for testing
  - Add fallthrough comments for gcc
  - Eliminate use of ULL constants
  - Separate out address sanitizing from warnings in configure
  - Remove destructive aspects of make distclean
  - Check for cc masquerading as gcc or clang in configure
  - Fix crc32.c to compile local functions only if used
  
  Changes in 1.2.11 (15 Jan 2017)
  - Fix deflate stored bug when pulling last block from window
  - Permit immediate deflateParams changes before any deflate input
  
  Changes in 1.2.10 (2 Jan 2017)
  - Avoid warnings on snprintf() return value
  - Fix bug in deflate_stored() for zero-length input
  - Fix bug in gzwrite.c that produced corrupt gzip files
  - Remove files to be installed before copying them in Makefile.in
  - Add warnings when compiling with assembler code
  
  Changes in 1.2.9 (31 Dec 2016)
  - Fix contrib/minizip to permit unzipping with desktop API [Zouzou]
  - Improve contrib/blast to return unused bytes
  - Assure that gzoffset() is correct when appending
  - Improve compress() and uncompress() to support large lengths
  - Fix bug in test/example.c where error code not saved
  - Remedy Coverity warning [Randers-Pehrson]
  - Improve speed of gzprintf() in transparent mode
  - Fix inflateInit2() bug when windowBits is 16 or 32
  - Change DEBUG macro to ZLIB_DEBUG
  - Avoid uninitialized access by gzclose_w()
  - Allow building zlib outside of the source directory
  - Fix bug that accepted invalid zlib header when windowBits is zero
  - Fix gzseek() problem on MinGW due to buggy _lseeki64 there
  - Loop on write() calls in gzwrite.c in case of non-blocking I/O
  - Add --warn (-w) option to ./configure for more compiler warnings
  - Reject a window size of 256 bytes if not using the zlib wrapper
  - Fix bug when level 0 used with Z_HUFFMAN or Z_RLE
  - Add --debug (-d) option to ./configure to define ZLIB_DEBUG
  - Fix bugs in creating a very large gzip header
  - Add uncompress2() function, which returns the input size used
  - Assure that deflateParams() will not switch functions mid-block
  - Dramatically speed up deflation for level 0 (storing)
  - Add gzfread(), duplicating the interface of fread()
  - Add gzfwrite(), duplicating the interface of fwrite()
  - Add deflateGetDictionary() function
  - Use snprintf() for later versions of Microsoft C
  - Fix *Init macros to use z_ prefix when requested
  - Replace as400 with os400 for OS/400 support [Monnerat]
  - Add crc32_z() and adler32_z() functions with size_t lengths
  - Update Visual Studio project files [AraHaan]
  
  Changes in 1.2.8 (28 Apr 2013)
  - Update contrib/minizip/iowin32.c for Windows RT [Vollant]
  - Do not force Z_CONST for C++
  - Clean up contrib/vstudio [Roß]
  - Correct spelling error in zlib.h
  - Fix mixed line endings in contrib/vstudio
  
  Changes in 1.2.7.3 (13 Apr 2013)
  - Fix version numbers and DLL names in contrib/vstudio/*/zlib.rc
  
  Changes in 1.2.7.2 (13 Apr 2013)
  - Change check for a four-byte type back to hexadecimal
  - Fix typo in win32/Makefile.msc
  - Add casts in gzwrite.c for pointer differences
  
  Changes in 1.2.7.1 (24 Mar 2013)
  - Replace use of unsafe string functions with snprintf if available
  - Avoid including stddef.h on Windows for Z_SOLO compile [Niessink]
  - Fix gzgetc undefine when Z_PREFIX set [Turk]
  - Eliminate use of mktemp in Makefile (not always available)
  - Fix bug in 'F' mode for gzopen()
  - Add inflateGetDictionary() function
  - Correct comment in deflate.h
  - Use _snprintf for snprintf in Microsoft C
  - On Darwin, only use /usr/bin/libtool if libtool is not Apple
  - Delete "--version" file if created by "ar --version" [Richard G.]
  - Fix configure check for veracity of compiler error return codes
  - Fix CMake compilation of static lib for MSVC2010 x64
  - Remove unused variable in infback9.c
  - Fix argument checks in gzlog_compress() and gzlog_write()
  - Clean up the usage of z_const and respect const usage within zlib
  - Clean up examples/gzlog.[ch] comparisons of different types
  - Avoid shift equal to bits in type (caused endless loop)
  - Fix uninitialized value bug in gzputc() introduced by const patches
  - Fix memory allocation error in examples/zran.c [Nor]
  - Fix bug where gzopen(), gzclose() would write an empty file
  - Fix bug in gzclose() when gzwrite() runs out of memory
  - Check for input buffer malloc failure in examples/gzappend.c
  - Add note to contrib/blast to use binary mode in stdio
  - Fix comparisons of differently signed integers in contrib/blast
  - Check for invalid code length codes in contrib/puff
  - Fix serious but very rare decompression bug in inftrees.c
  - Update inflateBack() comments, since inflate() can be faster
  - Use underscored I/O function names for WINAPI_FAMILY
  - Add _tr_flush_bits to the external symbols prefixed by --zprefix
  - Add contrib/vstudio/vc10 pre-build step for static only
  - Quote --version-script argument in CMakeLists.txt
  - Don't specify --version-script on Apple platforms in CMakeLists.txt
  - Fix casting error in contrib/testzlib/testzlib.c
  - Fix types in contrib/minizip to match result of get_crc_table()
  - Simplify contrib/vstudio/vc10 with 'd' suffix
  - Add TOP support to win32/Makefile.msc
  - Support i686 and amd64 assembler builds in CMakeLists.txt
  - Fix typos in the use of _LARGEFILE64_SOURCE in zconf.h
  - Add vc11 and vc12 build files to contrib/vstudio
  - Add gzvprintf() as an undocumented function in zlib
  - Fix configure for Sun shell
  - Remove runtime check in configure for four-byte integer type
  - Add casts and consts to ease user conversion to C++
  - Add man pages for minizip and miniunzip
  - In Makefile uninstall, don't rm if preceding cd fails
  - Do not return Z_BUF_ERROR if deflateParam() has nothing to write
  
  Changes in 1.2.7 (2 May 2012)
  - Replace use of memmove() with a simple copy for portability
  - Test for existence of strerror
  - Restore gzgetc_ for backward compatibility with 1.2.6
  - Fix build with non-GNU make on Solaris
  - Require gcc 4.0 or later on Mac OS X to use the hidden attribute
  - Include unistd.h for Watcom C
  - Use __WATCOMC__ instead of __WATCOM__
  - Do not use the visibility attribute if NO_VIZ defined
  - Improve the detection of no hidden visibility attribute
  - Avoid using __int64 for gcc or solo compilation
  - Cast to char * in gzprintf to avoid warnings [Zinser]
  - Fix make_vms.com for VAX [Zinser]
  - Don't use library or built-in byte swaps
  - Simplify test and use of gcc hidden attribute
  - Fix bug in gzclose_w() when gzwrite() fails to allocate memory
  - Add "x" (O_EXCL) and "e" (O_CLOEXEC) modes support to gzopen()
  - Fix bug in test/minigzip.c for configure --solo
  - Fix contrib/vstudio project link errors [Mohanathas]
  - Add ability to choose the builder in make_vms.com [Schweda]
  - Add DESTDIR support to mingw32 win32/Makefile.gcc
  - Fix comments in win32/Makefile.gcc for proper usage
  - Allow overriding the default install locations for cmake
  - Generate and install the pkg-config file with cmake
  - Build both a static and a shared version of zlib with cmake
  - Include version symbols for cmake builds
  - If using cmake with MSVC, add the source directory to the includes
  - Remove unneeded EXTRA_CFLAGS from win32/Makefile.gcc [Truta]
  - Move obsolete emx makefile to old [Truta]
  - Allow the use of -Wundef when compiling or using zlib
  - Avoid the use of the -u option with mktemp
  - Improve inflate() documentation on the use of Z_FINISH
  - Recognize clang as gcc
  - Add gzopen_w() in Windows for wide character path names
  - Rename zconf.h in CMakeLists.txt to move it out of the way
  - Add source directory in CMakeLists.txt for building examples
  - Look in build directory for zlib.pc in CMakeLists.txt
  - Remove gzflags from zlibvc.def in vc9 and vc10
  - Fix contrib/minizip compilation in the MinGW environment
  - Update ./configure for Solaris, support --64 [Mooney]
  - Remove -R. from Solaris shared build (possible security issue)
  - Avoid race condition for parallel make (-j) running example
  - Fix type mismatch between get_crc_table() and crc_table
  - Fix parsing of version with "-" in CMakeLists.txt [Snider, Ziegler]
  - Fix the path to zlib.map in CMakeLists.txt
  - Force the native libtool in Mac OS X to avoid GNU libtool [Beebe]
  - Add instructions to win32/Makefile.gcc for shared install [Torri]
  
  Changes in 1.2.6.1 (12 Feb 2012)
  - Avoid the use of the Objective-C reserved name "id"
  - Include io.h in gzguts.h for Microsoft compilers
  - Fix problem with ./configure --prefix and gzgetc macro
  - Include gz_header definition when compiling zlib solo
  - Put gzflags() functionality back in zutil.c
  - Avoid library header include in crc32.c for Z_SOLO
  - Use name in GCC_CLASSIC as C compiler for coverage testing, if set
  - Minor cleanup in contrib/minizip/zip.c [Vollant]
  - Update make_vms.com [Zinser]
  - Remove unnecessary gzgetc_ function
  - Use optimized byte swap operations for Microsoft and GNU [Snyder]
  - Fix minor typo in zlib.h comments [Rzesniowiecki]
  
  Changes in 1.2.6 (29 Jan 2012)
  - Update the Pascal interface in contrib/pascal
  - Fix function numbers for gzgetc_ in zlibvc.def files
  - Fix configure.ac for contrib/minizip [Schiffer]
  - Fix large-entry detection in minizip on 64-bit systems [Schiffer]
  - Have ./configure use the compiler return code for error indication
  - Fix CMakeLists.txt for cross compilation [McClure]
  - Fix contrib/minizip/zip.c for 64-bit architectures [Dalsnes]
  - Fix compilation of contrib/minizip on FreeBSD [Marquez]
  - Correct suggested usages in win32/Makefile.msc [Shachar, Horvath]
  - Include io.h for Turbo C / Borland C on all platforms [Truta]
  - Make version explicit in contrib/minizip/configure.ac [Bosmans]
  - Avoid warning for no encryption in contrib/minizip/zip.c [Vollant]
  - Minor cleanup up contrib/minizip/unzip.c [Vollant]
  - Fix bug when compiling minizip with C++ [Vollant]
  - Protect for long name and extra fields in contrib/minizip [Vollant]
  - Avoid some warnings in contrib/minizip [Vollant]
  - Add -I../.. -L../.. to CFLAGS for minizip and miniunzip
  - Add missing libs to minizip linker command
  - Add support for VPATH builds in contrib/minizip
  - Add an --enable-demos option to contrib/minizip/configure
  - Add the generation of configure.log by ./configure
  - Exit when required parameters not provided to win32/Makefile.gcc
  - Have gzputc return the character written instead of the argument
  - Use the -m option on ldconfig for BSD systems [Tobias]
  - Correct in zlib.map when deflateResetKeep was added
  
  Changes in 1.2.5.3 (15 Jan 2012)
  - Restore gzgetc function for binary compatibility
  - Do not use _lseeki64 under Borland C++ [Truta]
  - Update win32/Makefile.msc to build test/*.c [Truta]
  - Remove old/visualc6 given CMakefile and other alternatives
  - Update AS400 build files and documentation [Monnerat]
  - Update win32/Makefile.gcc to build test/*.c [Truta]
  - Permit stronger flushes after Z_BLOCK flushes
  - Avoid extraneous empty blocks when doing empty flushes
  - Permit Z_NULL arguments to deflatePending
  - Allow deflatePrime() to insert bits in the middle of a stream
  - Remove second empty static block for Z_PARTIAL_FLUSH
  - Write out all of the available bits when using Z_BLOCK
  - Insert the first two strings in the hash table after a flush
  
  Changes in 1.2.5.2 (17 Dec 2011)
  - fix ld error: unable to find version dependency 'ZLIB_1.2.5'
  - use relative symlinks for shared libs
  - Avoid searching past window for Z_RLE strategy
  - Assure that high-water mark initialization is always applied in deflate
  - Add assertions to fill_window() in deflate.c to match comments
  - Update python link in README
  - Correct spelling error in gzread.c
  - Fix bug in gzgets() for a concatenated empty gzip stream
  - Correct error in comment for gz_make()
  - Change gzread() and related to ignore junk after gzip streams
  - Allow gzread() and related to continue after gzclearerr()
  - Allow gzrewind() and gzseek() after a premature end-of-file
  - Simplify gzseek() now that raw after gzip is ignored
  - Change gzgetc() to a macro for speed (~40% speedup in testing)
  - Fix gzclose() to return the actual error last encountered
  - Always add large file support for windows
  - Include zconf.h for windows large file support
  - Include zconf.h.cmakein for windows large file support
  - Update zconf.h.cmakein on make distclean
  - Merge vestigial vsnprintf determination from zutil.h to gzguts.h
  - Clarify how gzopen() appends in zlib.h comments
  - Correct documentation of gzdirect() since junk at end now ignored
  - Add a transparent write mode to gzopen() when 'T' is in the mode
  - Update python link in zlib man page
  - Get inffixed.h and MAKEFIXED result to match
  - Add a ./config --solo option to make zlib subset with no library use
  - Add undocumented inflateResetKeep() function for CAB file decoding
  - Add --cover option to ./configure for gcc coverage testing
  - Add #define ZLIB_CONST option to use const in the z_stream interface
  - Add comment to gzdopen() in zlib.h to use dup() when using fileno()
  - Note behavior of uncompress() to provide as much data as it can
  - Add files in contrib/minizip to aid in building libminizip
  - Split off AR options in Makefile.in and configure
  - Change ON macro to Z_ARG to avoid application conflicts
  - Facilitate compilation with Borland C++ for pragmas and vsnprintf
  - Include io.h for Turbo C / Borland C++
  - Move example.c and minigzip.c to test/
  - Simplify incomplete code table filling in inflate_table()
  - Remove code from inflate.c and infback.c that is impossible to execute
  - Test the inflate code with full coverage
  - Allow deflateSetDictionary, inflateSetDictionary at any time (in raw)
  - Add deflateResetKeep and fix inflateResetKeep to retain dictionary
  - Fix gzwrite.c to accommodate reduced memory zlib compilation
  - Have inflate() with Z_FINISH avoid the allocation of a window
  - Do not set strm->adler when doing raw inflate
  - Fix gzeof() to behave just like feof() when read is not past end of file
  - Fix bug in gzread.c when end-of-file is reached
  - Avoid use of Z_BUF_ERROR in gz* functions except for premature EOF
  - Document gzread() capability to read concurrently written files
  - Remove hard-coding of resource compiler in CMakeLists.txt [Blammo]
  
  Changes in 1.2.5.1 (10 Sep 2011)
  - Update FAQ entry on shared builds (#13)
  - Avoid symbolic argument to chmod in Makefile.in
  - Fix bug and add consts in contrib/puff [Oberhumer]
  - Update contrib/puff/zeros.raw test file to have all block types
  - Add full coverage test for puff in contrib/puff/Makefile
  - Fix static-only-build install in Makefile.in
  - Fix bug in unzGetCurrentFileInfo() in contrib/minizip [Kuno]
  - Add libz.a dependency to shared in Makefile.in for parallel builds
  - Spell out "number" (instead of "nb") in zlib.h for total_in, total_out
  - Replace $(...) with `...` in configure for non-bash sh [Bowler]
  - Add darwin* to Darwin* and solaris* to SunOS\ 5* in configure [Groffen]
  - Add solaris* to Linux* in configure to allow gcc use [Groffen]
  - Add *bsd* to Linux* case in configure [Bar-Lev]
  - Add inffast.obj to dependencies in win32/Makefile.msc
  - Correct spelling error in deflate.h [Kohler]
  - Change libzdll.a again to libz.dll.a (!) in win32/Makefile.gcc
  - Add test to configure for GNU C looking for gcc in output of $cc -v
  - Add zlib.pc generation to win32/Makefile.gcc [Weigelt]
  - Fix bug in zlib.h for _FILE_OFFSET_BITS set and _LARGEFILE64_SOURCE not
  - Add comment in zlib.h that adler32_combine with len2 < 0 makes no sense
  - Make NO_DIVIDE option in adler32.c much faster (thanks to John Reiser)
  - Make stronger test in zconf.h to include unistd.h for LFS
  - Apply Darwin patches for 64-bit file offsets to contrib/minizip [Slack]
  - Fix zlib.h LFS support when Z_PREFIX used
  - Add updated as400 support (removed from old) [Monnerat]
  - Avoid deflate sensitivity to volatile input data
  - Avoid division in adler32_combine for NO_DIVIDE
  - Clarify the use of Z_FINISH with deflateBound() amount of space
  - Set binary for output file in puff.c
  - Use u4 type for crc_table to avoid conversion warnings
  - Apply casts in zlib.h to avoid conversion warnings
  - Add OF to prototypes for adler32_combine_ and crc32_combine_ [Miller]
  - Improve inflateSync() documentation to note indeterminacy
  - Add deflatePending() function to return the amount of pending output
  - Correct the spelling of "specification" in FAQ [Randers-Pehrson]
  - Add a check in configure for stdarg.h, use for gzprintf()
  - Check that pointers fit in ints when gzprint() compiled old style
  - Add dummy name before $(SHAREDLIBV) in Makefile [Bar-Lev, Bowler]
  - Delete line in configure that adds -L. libz.a to LDFLAGS [Weigelt]
  - Add debug records in assembler code [Londer]
  - Update RFC references to use http://tools.ietf.org/html/... [Li]
  - Add --archs option, use of libtool to configure for Mac OS X [Borstel]
  
  Changes in 1.2.5 (19 Apr 2010)
  - Disable visibility attribute in win32/Makefile.gcc [Bar-Lev]
  - Default to libdir as sharedlibdir in configure [Nieder]
  - Update copyright dates on modified source files
  - Update trees.c to be able to generate modified trees.h
  - Exit configure for MinGW, suggesting win32/Makefile.gcc
  - Check for NULL path in gz_open [Homurlu]
  
  Changes in 1.2.4.5 (18 Apr 2010)
  - Set sharedlibdir in configure [Torok]
  - Set LDFLAGS in Makefile.in [Bar-Lev]
  - Avoid mkdir objs race condition in Makefile.in [Bowler]
  - Add ZLIB_INTERNAL in front of internal inter-module functions and arrays
  - Define ZLIB_INTERNAL to hide internal functions and arrays for GNU C
  - Don't use hidden attribute when it is a warning generator (e.g. Solaris)
  
  Changes in 1.2.4.4 (18 Apr 2010)
  - Fix CROSS_PREFIX executable testing, CHOST extract, mingw* [Torok]
  - Undefine _LARGEFILE64_SOURCE in zconf.h if it is zero, but not if empty
  - Try to use bash or ksh regardless of functionality of /bin/sh
  - Fix configure incompatibility with NetBSD sh
  - Remove attempt to run under bash or ksh since have better NetBSD fix
  - Fix win32/Makefile.gcc for MinGW [Bar-Lev]
  - Add diagnostic messages when using CROSS_PREFIX in configure
  - Added --sharedlibdir option to configure [Weigelt]
  - Use hidden visibility attribute when available [Frysinger]
  
  Changes in 1.2.4.3 (10 Apr 2010)
  - Only use CROSS_PREFIX in configure for ar and ranlib if they exist
  - Use CROSS_PREFIX for nm [Bar-Lev]
  - Assume _LARGEFILE64_SOURCE defined is equivalent to true
  - Avoid use of undefined symbols in #if with && and ||
  - Make *64 prototypes in gzguts.h consistent with functions
  - Add -shared load option for MinGW in configure [Bowler]
  - Move z_off64_t to public interface, use instead of off64_t
  - Remove ! from shell test in configure (not portable to Solaris)
  - Change +0 macro tests to -0 for possibly increased portability
  
  Changes in 1.2.4.2 (9 Apr 2010)
  - Add consistent carriage returns to readme.txt's in masmx86 and masmx64
  - Really provide prototypes for *64 functions when building without LFS
  - Only define unlink() in minigzip.c if unistd.h not included
  - Update README to point to contrib/vstudio project files
  - Move projects/vc6 to old/ and remove projects/
  - Include stdlib.h in minigzip.c for setmode() definition under WinCE
  - Clean up assembler builds in win32/Makefile.msc [Rowe]
  - Include sys/types.h for Microsoft for off_t definition
  - Fix memory leak on error in gz_open()
  - Symbolize nm as $NM in configure [Weigelt]
  - Use TEST_LDSHARED instead of LDSHARED to link test programs [Weigelt]
  - Add +0 to _FILE_OFFSET_BITS and _LFS64_LARGEFILE in case not defined
  - Fix bug in gzeof() to take into account unused input data
  - Avoid initialization of structures with variables in puff.c
  - Updated win32/README-WIN32.txt [Rowe]
  
  Changes in 1.2.4.1 (28 Mar 2010)
  - Remove the use of [a-z] constructs for sed in configure [gentoo 310225]
  - Remove $(SHAREDLIB) from LIBS in Makefile.in [Creech]
  - Restore "for debugging" comment on sprintf() in gzlib.c
  - Remove fdopen for MVS from gzguts.h
  - Put new README-WIN32.txt in win32 [Rowe]
  - Add check for shell to configure and invoke another shell if needed
  - Fix big fat stinking bug in gzseek() on uncompressed files
  - Remove vestigial F_OPEN64 define in zutil.h
  - Set and check the value of _LARGEFILE_SOURCE and _LARGEFILE64_SOURCE
  - Avoid errors on non-LFS systems when applications define LFS macros
  - Set EXE to ".exe" in configure for MINGW [Kahle]
  - Match crc32() in crc32.c exactly to the prototype in zlib.h [Sherrill]
  - Add prefix for cross-compilation in win32/makefile.gcc [Bar-Lev]
  - Add DLL install in win32/makefile.gcc [Bar-Lev]
  - Allow Linux* or linux* from uname in configure [Bar-Lev]
  - Allow ldconfig to be redefined in configure and Makefile.in [Bar-Lev]
  - Add cross-compilation prefixes to configure [Bar-Lev]
  - Match type exactly in gz_load() invocation in gzread.c
  - Match type exactly of zcalloc() in zutil.c to zlib.h alloc_func
  - Provide prototypes for *64 functions when building zlib without LFS
  - Don't use -lc when linking shared library on MinGW
  - Remove errno.h check in configure and vestigial errno code in zutil.h
  
  Changes in 1.2.4 (14 Mar 2010)
  - Fix VER3 extraction in configure for no fourth subversion
  - Update zlib.3, add docs to Makefile.in to make .pdf out of it
  - Add zlib.3.pdf to distribution
  - Don't set error code in gzerror() if passed pointer is NULL
  - Apply destination directory fixes to CMakeLists.txt [Lowman]
  - Move #cmakedefine's to a new zconf.in.cmakein
  - Restore zconf.h for builds that don't use configure or cmake
  - Add distclean to dummy Makefile for convenience
  - Update and improve INDEX, README, and FAQ
  - Update CMakeLists.txt for the return of zconf.h [Lowman]
  - Update contrib/vstudio/vc9 and vc10 [Vollant]
  - Change libz.dll.a back to libzdll.a in win32/Makefile.gcc
  - Apply license and readme changes to contrib/asm686 [Raiter]
  - Check file name lengths and add -c option in minigzip.c [Li]
  - Update contrib/amd64 and contrib/masmx86/ [Vollant]
  - Avoid use of "eof" parameter in trees.c to not shadow library variable
  - Update make_vms.com for removal of zlibdefs.h [Zinser]
  - Update assembler code and vstudio projects in contrib [Vollant]
  - Remove outdated assembler code contrib/masm686 and contrib/asm586
  - Remove old vc7 and vc8 from contrib/vstudio
  - Update win32/Makefile.msc, add ZLIB_VER_SUBREVISION [Rowe]
  - Fix memory leaks in gzclose_r() and gzclose_w(), file leak in gz_open()
  - Add contrib/gcc_gvmat64 for longest_match and inflate_fast [Vollant]
  - Remove *64 functions from win32/zlib.def (they're not 64-bit yet)
  - Fix bug in void-returning vsprintf() case in gzwrite.c
  - Fix name change from inflate.h in contrib/inflate86/inffas86.c
  - Check if temporary file exists before removing in make_vms.com [Zinser]
  - Fix make install and uninstall for --static option
  - Fix usage of _MSC_VER in gzguts.h and zutil.h [Truta]
  - Update readme.txt in contrib/masmx64 and masmx86 to assemble
  
  Changes in 1.2.3.9 (21 Feb 2010)
  - Expunge gzio.c
  - Move as400 build information to old
  - Fix updates in contrib/minizip and contrib/vstudio
  - Add const to vsnprintf test in configure to avoid warnings [Weigelt]
  - Delete zconf.h (made by configure) [Weigelt]
  - Change zconf.in.h to zconf.h.in per convention [Weigelt]
  - Check for NULL buf in gzgets()
  - Return empty string for gzgets() with len == 1 (like fgets())
  - Fix description of gzgets() in zlib.h for end-of-file, NULL return
  - Update minizip to 1.1 [Vollant]
  - Avoid MSVC loss of data warnings in gzread.c, gzwrite.c
  - Note in zlib.h that gzerror() should be used to distinguish from EOF
  - Remove use of snprintf() from gzlib.c
  - Fix bug in gzseek()
  - Update contrib/vstudio, adding vc9 and vc10 [Kuno, Vollant]
  - Fix zconf.h generation in CMakeLists.txt [Lowman]
  - Improve comments in zconf.h where modified by configure
  
  Changes in 1.2.3.8 (13 Feb 2010)
  - Clean up text files (tabs, trailing whitespace, etc.) [Oberhumer]
  - Use z_off64_t in gz_zero() and gz_skip() to match state->skip
  - Avoid comparison problem when sizeof(int) == sizeof(z_off64_t)
  - Revert to Makefile.in from 1.2.3.6 (live with the clutter)
  - Fix missing error return in gzflush(), add zlib.h note
  - Add *64 functions to zlib.map [Levin]
  - Fix signed/unsigned comparison in gz_comp()
  - Use SFLAGS when testing shared linking in configure
  - Add --64 option to ./configure to use -m64 with gcc
  - Fix ./configure --help to correctly name options
  - Have make fail if a test fails [Levin]
  - Avoid buffer overrun in contrib/masmx64/gvmat64.asm [Simpson]
  - Remove assembler object files from contrib
  
  Changes in 1.2.3.7 (24 Jan 2010)
  - Always gzopen() with O_LARGEFILE if available
  - Fix gzdirect() to work immediately after gzopen() or gzdopen()
  - Make gzdirect() more precise when the state changes while reading
  - Improve zlib.h documentation in many places
  - Catch memory allocation failure in gz_open()
  - Complete close operation if seek forward in gzclose_w() fails
  - Return Z_ERRNO from gzclose_r() if close() fails
  - Return Z_STREAM_ERROR instead of EOF for gzclose() being passed NULL
  - Return zero for gzwrite() errors to match zlib.h description
  - Return -1 on gzputs() error to match zlib.h description
  - Add zconf.in.h to allow recovery from configure modification [Weigelt]
  - Fix static library permissions in Makefile.in [Weigelt]
  - Avoid warnings in configure tests that hide functionality [Weigelt]
  - Add *BSD and DragonFly to Linux case in configure [gentoo 123571]
  - Change libzdll.a to libz.dll.a in win32/Makefile.gcc [gentoo 288212]
  - Avoid access of uninitialized data for first inflateReset2 call [Gomes]
  - Keep object files in subdirectories to reduce the clutter somewhat
  - Remove default Makefile and zlibdefs.h, add dummy Makefile
  - Add new external functions to Z_PREFIX, remove duplicates, z_z_ -> z_
  - Remove zlibdefs.h completely -- modify zconf.h instead
  
  Changes in 1.2.3.6 (17 Jan 2010)
  - Avoid void * arithmetic in gzread.c and gzwrite.c
  - Make compilers happier with const char * for gz_error message
  - Avoid unused parameter warning in inflate.c
  - Avoid signed-unsigned comparison warning in inflate.c
  - Indent #pragma's for traditional C
  - Fix usage of strwinerror() in glib.c, change to gz_strwinerror()
  - Correct email address in configure for system options
  - Update make_vms.com and add make_vms.com to contrib/minizip [Zinser]
  - Update zlib.map [Brown]
  - Fix Makefile.in for Solaris 10 make of example64 and minizip64 [Torok]
  - Apply various fixes to CMakeLists.txt [Lowman]
  - Add checks on len in gzread() and gzwrite()
  - Add error message for no more room for gzungetc()
  - Remove zlib version check in gzwrite()
  - Defer compression of gzprintf() result until need to
  - Use snprintf() in gzdopen() if available
  - Remove USE_MMAP configuration determination (only used by minigzip)
  - Remove examples/pigz.c (available separately)
  - Update examples/gun.c to 1.6
  
  Changes in 1.2.3.5 (8 Jan 2010)
  - Add space after #if in zutil.h for some compilers
  - Fix relatively harmless bug in deflate_fast() [Exarevsky]
  - Fix same problem in deflate_slow()
  - Add $(SHAREDLIBV) to LIBS in Makefile.in [Brown]
  - Add deflate_rle() for faster Z_RLE strategy run-length encoding
  - Add deflate_huff() for faster Z_HUFFMAN_ONLY encoding
  - Change name of "write" variable in inffast.c to avoid library collisions
  - Fix premature EOF from gzread() in gzio.c [Brown]
  - Use zlib header window size if windowBits is 0 in inflateInit2()
  - Remove compressBound() call in deflate.c to avoid linking compress.o
  - Replace use of errno in gz* with functions, support WinCE [Alves]
  - Provide alternative to perror() in minigzip.c for WinCE [Alves]
  - Don't use _vsnprintf on later versions of MSVC [Lowman]
  - Add CMake build script and input file [Lowman]
  - Update contrib/minizip to 1.1 [Svensson, Vollant]
  - Moved nintendods directory from contrib to root
  - Replace gzio.c with a new set of routines with the same functionality
  - Add gzbuffer(), gzoffset(), gzclose_r(), gzclose_w() as part of above
  - Update contrib/minizip to 1.1b
  - Change gzeof() to return 0 on error instead of -1 to agree with zlib.h
  
  Changes in 1.2.3.4 (21 Dec 2009)
  - Use old school .SUFFIXES in Makefile.in for FreeBSD compatibility
  - Update comments in configure and Makefile.in for default --shared
  - Fix test -z's in configure [Marquess]
  - Build examplesh and minigzipsh when not testing
  - Change NULL's to Z_NULL's in deflate.c and in comments in zlib.h
  - Import LDFLAGS from the environment in configure
  - Fix configure to populate SFLAGS with discovered CFLAGS options
  - Adapt make_vms.com to the new Makefile.in [Zinser]
  - Add zlib2ansi script for C++ compilation [Marquess]
  - Add _FILE_OFFSET_BITS=64 test to make test (when applicable)
  - Add AMD64 assembler code for longest match to contrib [Teterin]
  - Include options from $SFLAGS when doing $LDSHARED
  - Simplify 64-bit file support by introducing z_off64_t type
  - Make shared object files in objs directory to work around old Sun cc
  - Use only three-part version number for Darwin shared compiles
  - Add rc option to ar in Makefile.in for when ./configure not run
  - Add -WI,-rpath,. to LDFLAGS for OSF 1 V4*
  - Set LD_LIBRARYN32_PATH for SGI IRIX shared compile
  - Protect against _FILE_OFFSET_BITS being defined when compiling zlib
  - Rename Makefile.in targets allstatic to static and allshared to shared
  - Fix static and shared Makefile.in targets to be independent
  - Correct error return bug in gz_open() by setting state [Brown]
  - Put spaces before ;;'s in configure for better sh compatibility
  - Add pigz.c (parallel implementation of gzip) to examples/
  - Correct constant in crc32.c to UL [Leventhal]
  - Reject negative lengths in crc32_combine()
  - Add inflateReset2() function to work like inflateEnd()/inflateInit2()
  - Include sys/types.h for _LARGEFILE64_SOURCE [Brown]
  - Correct typo in doc/algorithm.txt [Janik]
  - Fix bug in adler32_combine() [Zhu]
  - Catch missing-end-of-block-code error in all inflates and in puff
      Assures that random input to inflate eventually results in an error
  - Added enough.c (calculation of ENOUGH for inftrees.h) to examples/
  - Update ENOUGH and its usage to reflect discovered bounds
  - Fix gzerror() error report on empty input file [Brown]
  - Add ush casts in trees.c to avoid pedantic runtime errors
  - Fix typo in zlib.h uncompress() description [Reiss]
  - Correct inflate() comments with regard to automatic header detection
  - Remove deprecation comment on Z_PARTIAL_FLUSH (it stays)
  - Put new version of gzlog (2.0) in examples with interruption recovery
  - Add puff compile option to permit invalid distance-too-far streams
  - Add puff TEST command options, ability to read piped input
  - Prototype the *64 functions in zlib.h when _FILE_OFFSET_BITS == 64, but
    _LARGEFILE64_SOURCE not defined
  - Fix Z_FULL_FLUSH to truly erase the past by resetting s->strstart
  - Fix deflateSetDictionary() to use all 32K for output consistency
  - Remove extraneous #define MIN_LOOKAHEAD in deflate.c (in deflate.h)
  - Clear bytes after deflate lookahead to avoid use of uninitialized data
  - Change a limit in inftrees.c to be more transparent to Coverity Prevent
  - Update win32/zlib.def with exported symbols from zlib.h
  - Correct spelling errors in zlib.h [Willem, Sobrado]
  - Allow Z_BLOCK for deflate() to force a new block
  - Allow negative bits in inflatePrime() to delete existing bit buffer
  - Add Z_TREES flush option to inflate() to return at end of trees
  - Add inflateMark() to return current state information for random access
  - Add Makefile for NintendoDS to contrib [Costa]
  - Add -w in configure compile tests to avoid spurious warnings [Beucler]
  - Fix typos in zlib.h comments for deflateSetDictionary()
  - Fix EOF detection in transparent gzread() [Maier]
  
  Changes in 1.2.3.3 (2 October 2006)
  - Make --shared the default for configure, add a --static option
  - Add compile option to permit invalid distance-too-far streams
  - Add inflateUndermine() function which is required to enable above
  - Remove use of "this" variable name for C++ compatibility [Marquess]
  - Add testing of shared library in make test, if shared library built
  - Use ftello() and fseeko() if available instead of ftell() and fseek()
  - Provide two versions of all functions that use the z_off_t type for
    binary compatibility -- a normal version and a 64-bit offset version,
    per the Large File Support Extension when _LARGEFILE64_SOURCE is
    defined; use the 64-bit versions by default when _FILE_OFFSET_BITS
    is defined to be 64
  - Add a --uname= option to configure to perhaps help with cross-compiling
  
  Changes in 1.2.3.2 (3 September 2006)
  - Turn off silly Borland warnings [Hay]
  - Use off64_t and define _LARGEFILE64_SOURCE when present
  - Fix missing dependency on inffixed.h in Makefile.in
  - Rig configure --shared to build both shared and static [Teredesai, Truta]
  - Remove zconf.in.h and instead create a new zlibdefs.h file
  - Fix contrib/minizip/unzip.c non-encrypted after encrypted [Vollant]
  - Add treebuild.xml (see http://treebuild.metux.de/) [Weigelt]
  
  Changes in 1.2.3.1 (16 August 2006)
  - Add watcom directory with OpenWatcom make files [Daniel]
  - Remove #undef of FAR in zconf.in.h for MVS [Fedtke]
  - Update make_vms.com [Zinser]
  - Use -fPIC for shared build in configure [Teredesai, Nicholson]
  - Use only major version number for libz.so on IRIX and OSF1 [Reinholdtsen]
  - Use fdopen() (not _fdopen()) for Interix in zutil.h [Bäck]
  - Add some FAQ entries about the contrib directory
  - Update the MVS question in the FAQ
  - Avoid extraneous reads after EOF in gzio.c [Brown]
  - Correct spelling of "successfully" in gzio.c [Randers-Pehrson]
  - Add comments to zlib.h about gzerror() usage [Brown]
  - Set extra flags in gzip header in gzopen() like deflate() does
  - Make configure options more compatible with double-dash conventions
    [Weigelt]
  - Clean up compilation under Solaris SunStudio cc [Rowe, Reinholdtsen]
  - Fix uninstall target in Makefile.in [Truta]
  - Add pkgconfig support [Weigelt]
  - Use $(DESTDIR) macro in Makefile.in [Reinholdtsen, Weigelt]
  - Replace set_data_type() with a more accurate detect_data_type() in
    trees.c, according to the txtvsbin.txt document [Truta]
  - Swap the order of #include <stdio.h> and #include "zlib.h" in
    gzio.c, example.c and minigzip.c [Truta]
  - Shut up annoying VS2005 warnings about standard C deprecation [Rowe,
    Truta] (where?)
  - Fix target "clean" from win32/Makefile.bor [Truta]
  - Create .pdb and .manifest files in win32/makefile.msc [Ziegler, Rowe]
  - Update zlib www home address in win32/DLL_FAQ.txt [Truta]
  - Update contrib/masmx86/inffas32.asm for VS2005 [Vollant, Van Wassenhove]
  - Enable browse info in the "Debug" and "ASM Debug" configurations in
    the Visual C++ 6 project, and set (non-ASM) "Debug" as default [Truta]
  - Add pkgconfig support [Weigelt]
  - Add ZLIB_VER_MAJOR, ZLIB_VER_MINOR and ZLIB_VER_REVISION in zlib.h,
    for use in win32/zlib1.rc [Polushin, Rowe, Truta]
  - Add a document that explains the new text detection scheme to
    doc/txtvsbin.txt [Truta]
  - Add rfc1950.txt, rfc1951.txt and rfc1952.txt to doc/ [Truta]
  - Move algorithm.txt into doc/ [Truta]
  - Synchronize FAQ with website
  - Fix compressBound(), was low for some pathological cases [Fearnley]
  - Take into account wrapper variations in deflateBound()
  - Set examples/zpipe.c input and output to binary mode for Windows
  - Update examples/zlib_how.html with new zpipe.c (also web site)
  - Fix some warnings in examples/gzlog.c and examples/zran.c (it seems
    that gcc became pickier in 4.0)
  - Add zlib.map for Linux: "All symbols from zlib-1.1.4 remain
    un-versioned, the patch adds versioning only for symbols introduced in
    zlib-1.2.0 or later.  It also declares as local those symbols which are
    not designed to be exported." [Levin]
  - Update Z_PREFIX list in zconf.in.h, add --zprefix option to configure
  - Do not initialize global static by default in trees.c, add a response
    NO_INIT_GLOBAL_POINTERS to initialize them if needed [Marquess]
  - Don't use strerror() in gzio.c under WinCE [Yakimov]
  - Don't use errno.h in zutil.h under WinCE [Yakimov]
  - Move arguments for AR to its usage to allow replacing ar [Marot]
  - Add HAVE_VISIBILITY_PRAGMA in zconf.in.h for Mozilla [Randers-Pehrson]
  - Improve inflateInit() and inflateInit2() documentation
  - Fix structure size comment in inflate.h
  - Change configure help option from --h* to --help [Santos]
  
  Changes in 1.2.3 (18 July 2005)
  - Apply security vulnerability fixes to contrib/infback9 as well
  - Clean up some text files (carriage returns, trailing space)
  - Update testzlib, vstudio, masmx64, and masmx86 in contrib [Vollant]
  
  Changes in 1.2.2.4 (11 July 2005)
  - Add inflatePrime() function for starting inflation at bit boundary
  - Avoid some Visual C warnings in deflate.c
  - Avoid more silly Visual C warnings in inflate.c and inftrees.c for 64-bit
    compile
  - Fix some spelling errors in comments [Betts]
  - Correct inflateInit2() error return documentation in zlib.h
  - Add zran.c example of compressed data random access to examples
    directory, shows use of inflatePrime()
  - Fix cast for assignments to strm->state in inflate.c and infback.c
  - Fix zlibCompileFlags() in zutil.c to use 1L for long shifts [Oberhumer]
  - Move declarations of gf2 functions to right place in crc32.c [Oberhumer]
  - Add cast in trees.c t avoid a warning [Oberhumer]
  - Avoid some warnings in fitblk.c, gun.c, gzjoin.c in examples [Oberhumer]
  - Update make_vms.com [Zinser]
  - Initialize state->write in inflateReset() since copied in inflate_fast()
  - Be more strict on incomplete code sets in inflate_table() and increase
    ENOUGH and MAXD -- this repairs a possible security vulnerability for
    invalid inflate input.  Thanks to Tavis Ormandy and Markus Oberhumer for
    discovering the vulnerability and providing test cases
  - Add ia64 support to configure for HP-UX [Smith]
  - Add error return to gzread() for format or i/o error [Levin]
  - Use malloc.h for OS/2 [Necasek]
  
  Changes in 1.2.2.3 (27 May 2005)
  - Replace 1U constants in inflate.c and inftrees.c for 64-bit compile
  - Typecast fread() return values in gzio.c [Vollant]
  - Remove trailing space in minigzip.c outmode (VC++ can't deal with it)
  - Fix crc check bug in gzread() after gzungetc() [Heiner]
  - Add the deflateTune() function to adjust internal compression parameters
  - Add a fast gzip decompressor, gun.c, to examples (use of inflateBack)
  - Remove an incorrect assertion in examples/zpipe.c
  - Add C++ wrapper in infback9.h [Donais]
  - Fix bug in inflateCopy() when decoding fixed codes
  - Note in zlib.h how much deflateSetDictionary() actually uses
  - Remove USE_DICT_HEAD in deflate.c (would mess up inflate if used)
  - Add _WIN32_WCE to define WIN32 in zconf.in.h [Spencer]
  - Don't include stderr.h or errno.h for _WIN32_WCE in zutil.h [Spencer]
  - Add gzdirect() function to indicate transparent reads
  - Update contrib/minizip [Vollant]
  - Fix compilation of deflate.c when both ASMV and FASTEST [Oberhumer]
  - Add casts in crc32.c to avoid warnings [Oberhumer]
  - Add contrib/masmx64 [Vollant]
  - Update contrib/asm586, asm686, masmx86, testzlib, vstudio [Vollant]
  
  Changes in 1.2.2.2 (30 December 2004)
  - Replace structure assignments in deflate.c and inflate.c with zmemcpy to
    avoid implicit memcpy calls (portability for no-library compilation)
  - Increase sprintf() buffer size in gzdopen() to allow for large numbers
  - Add INFLATE_STRICT to check distances against zlib header
  - Improve WinCE errno handling and comments [Chang]
  - Remove comment about no gzip header processing in FAQ
  - Add Z_FIXED strategy option to deflateInit2() to force fixed trees
  - Add updated make_vms.com [Coghlan], update README
  - Create a new "examples" directory, move gzappend.c there, add zpipe.c,
    fitblk.c, gzlog.[ch], gzjoin.c, and zlib_how.html
  - Add FAQ entry and comments in deflate.c on uninitialized memory access
  - Add Solaris 9 make options in configure [Gilbert]
  - Allow strerror() usage in gzio.c for STDC
  - Fix DecompressBuf in contrib/delphi/ZLib.pas [ManChesTer]
  - Update contrib/masmx86/inffas32.asm and gvmat32.asm [Vollant]
  - Use z_off_t for adler32_combine() and crc32_combine() lengths
  - Make adler32() much faster for small len
  - Use OS_CODE in deflate() default gzip header
  
  Changes in 1.2.2.1 (31 October 2004)
  - Allow inflateSetDictionary() call for raw inflate
  - Fix inflate header crc check bug for file names and comments
  - Add deflateSetHeader() and gz_header structure for custom gzip headers
  - Add inflateGetheader() to retrieve gzip headers
  - Add crc32_combine() and adler32_combine() functions
  - Add alloc_func, free_func, in_func, out_func to Z_PREFIX list
  - Use zstreamp consistently in zlib.h (inflate_back functions)
  - Remove GUNZIP condition from definition of inflate_mode in inflate.h
    and in contrib/inflate86/inffast.S [Truta, Anderson]
  - Add support for AMD64 in contrib/inflate86/inffas86.c [Anderson]
  - Update projects/README.projects and projects/visualc6 [Truta]
  - Update win32/DLL_FAQ.txt [Truta]
  - Avoid warning under NO_GZCOMPRESS in gzio.c; fix typo [Truta]
  - Deprecate Z_ASCII; use Z_TEXT instead [Truta]
  - Use a new algorithm for setting strm->data_type in trees.c [Truta]
  - Do not define an exit() prototype in zutil.c unless DEBUG defined
  - Remove prototype of exit() from zutil.c, example.c, minigzip.c [Truta]
  - Add comment in zlib.h for Z_NO_FLUSH parameter to deflate()
  - Fix Darwin build version identification [Peterson]
  
  Changes in 1.2.2 (3 October 2004)
  - Update zlib.h comments on gzip in-memory processing
  - Set adler to 1 in inflateReset() to support Java test suite [Walles]
  - Add contrib/dotzlib [Ravn]
  - Update win32/DLL_FAQ.txt [Truta]
  - Update contrib/minizip [Vollant]
  - Move contrib/visual-basic.txt to old/ [Truta]
  - Fix assembler builds in projects/visualc6/ [Truta]
  
  Changes in 1.2.1.2 (9 September 2004)
  - Update INDEX file
  - Fix trees.c to update strm->data_type (no one ever noticed!)
  - Fix bug in error case in inflate.c, infback.c, and infback9.c [Brown]
  - Add "volatile" to crc table flag declaration (for DYNAMIC_CRC_TABLE)
  - Add limited multitasking protection to DYNAMIC_CRC_TABLE
  - Add NO_vsnprintf for VMS in zutil.h [Mozilla]
  - Don't declare strerror() under VMS [Mozilla]
  - Add comment to DYNAMIC_CRC_TABLE to use get_crc_table() to initialize
  - Update contrib/ada [Anisimkov]
  - Update contrib/minizip [Vollant]
  - Fix configure to not hardcode directories for Darwin [Peterson]
  - Fix gzio.c to not return error on empty files [Brown]
  - Fix indentation; update version in contrib/delphi/ZLib.pas and
    contrib/pascal/zlibpas.pas [Truta]
  - Update mkasm.bat in contrib/masmx86 [Truta]
  - Update contrib/untgz [Truta]
  - Add projects/README.projects [Truta]
  - Add project for MS Visual C++ 6.0 in projects/visualc6 [Cadieux, Truta]
  - Update win32/DLL_FAQ.txt [Truta]
  - Update list of Z_PREFIX symbols in zconf.h [Randers-Pehrson, Truta]
  - Remove an unnecessary assignment to curr in inftrees.c [Truta]
  - Add OS/2 to exe builds in configure [Poltorak]
  - Remove err dummy parameter in zlib.h [Kientzle]
  
  Changes in 1.2.1.1 (9 January 2004)
  - Update email address in README
  - Several FAQ updates
  - Fix a big fat bug in inftrees.c that prevented decoding valid
    dynamic blocks with only literals and no distance codes --
    Thanks to "Hot Emu" for the bug report and sample file
  - Add a note to puff.c on no distance codes case
  
  Changes in 1.2.1 (17 November 2003)
  - Remove a tab in contrib/gzappend/gzappend.c
  - Update some interfaces in contrib for new zlib functions
  - Update zlib version number in some contrib entries
  - Add Windows CE definition for ptrdiff_t in zutil.h [Mai, Truta]
  - Support shared libraries on Hurd and KFreeBSD [Brown]
  - Fix error in NO_DIVIDE option of adler32.c
  
  Changes in 1.2.0.8 (4 November 2003)
  - Update version in contrib/delphi/ZLib.pas and contrib/pascal/zlibpas.pas
  - Add experimental NO_DIVIDE #define in adler32.c
      - Possibly faster on some processors (let me know if it is)
  - Correct Z_BLOCK to not return on first inflate call if no wrap
  - Fix strm->data_type on inflate() return to correctly indicate EOB
  - Add deflatePrime() function for appending in the middle of a byte
  - Add contrib/gzappend for an example of appending to a stream
  - Update win32/DLL_FAQ.txt [Truta]
  - Delete Turbo C comment in README [Truta]
  - Improve some indentation in zconf.h [Truta]
  - Fix infinite loop on bad input in configure script [Church]
  - Fix gzeof() for concatenated gzip files [Johnson]
  - Add example to contrib/visual-basic.txt [Michael B.]
  - Add -p to mkdir's in Makefile.in [vda]
  - Fix configure to properly detect presence or lack of printf functions
  - Add AS400 support [Monnerat]
  - Add a little Cygwin support [Wilson]
  
  Changes in 1.2.0.7 (21 September 2003)
  - Correct some debug formats in contrib/infback9
  - Cast a type in a debug statement in trees.c
  - Change search and replace delimiter in configure from % to # [Beebe]
  - Update contrib/untgz to 0.2 with various fixes [Truta]
  - Add build support for Amiga [Nikl]
  - Remove some directories in old that have been updated to 1.2
  - Add dylib building for Mac OS X in configure and Makefile.in
  - Remove old distribution stuff from Makefile
  - Update README to point to DLL_FAQ.txt, and add comment on Mac OS X
  - Update links in README
  
  Changes in 1.2.0.6 (13 September 2003)
  - Minor FAQ updates
  - Update contrib/minizip to 1.00 [Vollant]
  - Remove test of gz functions in example.c when GZ_COMPRESS defined [Truta]
  - Update POSTINC comment for 68060 [Nikl]
  - Add contrib/infback9 with deflate64 decoding (unsupported)
  - For MVS define NO_vsnprintf and undefine FAR [van Burik]
  - Add pragma for fdopen on MVS [van Burik]
  
  Changes in 1.2.0.5 (8 September 2003)
  - Add OF to inflateBackEnd() declaration in zlib.h
  - Remember start when using gzdopen in the middle of a file
  - Use internal off_t counters in gz* functions to properly handle seeks
  - Perform more rigorous check for distance-too-far in inffast.c
  - Add Z_BLOCK flush option to return from inflate at block boundary
  - Set strm->data_type on return from inflate
      - Indicate bits unused, if at block boundary, and if in last block
  - Replace size_t with ptrdiff_t in crc32.c, and check for correct size
  - Add condition so old NO_DEFLATE define still works for compatibility
  - FAQ update regarding the Windows DLL [Truta]
  - INDEX update: add qnx entry, remove aix entry [Truta]
  - Install zlib.3 into mandir [Wilson]
  - Move contrib/zlib_dll_FAQ.txt to win32/DLL_FAQ.txt; update [Truta]
  - Adapt the zlib interface to the new DLL convention guidelines [Truta]
  - Introduce ZLIB_WINAPI macro to allow the export of functions using
    the WINAPI calling convention, for Visual Basic [Vollant, Truta]
  - Update msdos and win32 scripts and makefiles [Truta]
  - Export symbols by name, not by ordinal, in win32/zlib.def [Truta]
  - Add contrib/ada [Anisimkov]
  - Move asm files from contrib/vstudio/vc70_32 to contrib/asm386 [Truta]
  - Rename contrib/asm386 to contrib/masmx86 [Truta, Vollant]
  - Add contrib/masm686 [Truta]
  - Fix offsets in contrib/inflate86 and contrib/masmx86/inffas32.asm
    [Truta, Vollant]
  - Update contrib/delphi; rename to contrib/pascal; add example [Truta]
  - Remove contrib/delphi2; add a new contrib/delphi [Truta]
  - Avoid inclusion of the nonstandard <memory.h> in contrib/iostream,
    and fix some method prototypes [Truta]
  - Fix the ZCR_SEED2 constant to avoid warnings in contrib/minizip
    [Truta]
  - Avoid the use of backslash (\) in contrib/minizip [Vollant]
  - Fix file time handling in contrib/untgz; update makefiles [Truta]
  - Update contrib/vstudio/vc70_32 to comply with the new DLL guidelines
    [Vollant]
  - Remove contrib/vstudio/vc15_16 [Vollant]
  - Rename contrib/vstudio/vc70_32 to contrib/vstudio/vc7 [Truta]
  - Update README.contrib [Truta]
  - Invert the assignment order of match_head and s->prev[...] in
    INSERT_STRING [Truta]
  - Compare TOO_FAR with 32767 instead of 32768, to avoid 16-bit warnings
    [Truta]
  - Compare function pointers with 0, not with NULL or Z_NULL [Truta]
  - Fix prototype of syncsearch in inflate.c [Truta]
  - Introduce ASMINF macro to be enabled when using an ASM implementation
    of inflate_fast [Truta]
  - Change NO_DEFLATE to NO_GZCOMPRESS [Truta]
  - Modify test_gzio in example.c to take a single file name as a
    parameter [Truta]
  - Exit the example.c program if gzopen fails [Truta]
  - Add type casts around strlen in example.c [Truta]
  - Remove casting to sizeof in minigzip.c; give a proper type
    to the variable compared with SUFFIX_LEN [Truta]
  - Update definitions of STDC and STDC99 in zconf.h [Truta]
  - Synchronize zconf.h with the new Windows DLL interface [Truta]
  - Use SYS16BIT instead of __32BIT__ to distinguish between
    16- and 32-bit platforms [Truta]
  - Use far memory allocators in small 16-bit memory models for
    Turbo C [Truta]
  - Add info about the use of ASMV, ASMINF and ZLIB_WINAPI in
    zlibCompileFlags [Truta]
  - Cygwin has vsnprintf [Wilson]
  - In Windows16, OS_CODE is 0, as in MSDOS [Truta]
  - In Cygwin, OS_CODE is 3 (Unix), not 11 (Windows32) [Wilson]
  
  Changes in 1.2.0.4 (10 August 2003)
  - Minor FAQ updates
  - Be more strict when checking inflateInit2's windowBits parameter
  - Change NO_GUNZIP compile option to NO_GZIP to cover deflate as well
  - Add gzip wrapper option to deflateInit2 using windowBits
  - Add updated QNX rule in configure and qnx directory [Bonnefoy]
  - Make inflate distance-too-far checks more rigorous
  - Clean up FAR usage in inflate
  - Add casting to sizeof() in gzio.c and minigzip.c
  
  Changes in 1.2.0.3 (19 July 2003)
  - Fix silly error in gzungetc() implementation [Vollant]
  - Update contrib/minizip and contrib/vstudio [Vollant]
  - Fix printf format in example.c
  - Correct cdecl support in zconf.in.h [Anisimkov]
  - Minor FAQ updates
  
  Changes in 1.2.0.2 (13 July 2003)
  - Add ZLIB_VERNUM in zlib.h for numerical preprocessor comparisons
  - Attempt to avoid warnings in crc32.c for pointer-int conversion
  - Add AIX to configure, remove aix directory [Bakker]
  - Add some casts to minigzip.c
  - Improve checking after insecure sprintf() or vsprintf() calls
  - Remove #elif's from crc32.c
  - Change leave label to inf_leave in inflate.c and infback.c to avoid
    library conflicts
  - Remove inflate gzip decoding by default--only enable gzip decoding by
    special request for stricter backward compatibility
  - Add zlibCompileFlags() function to return compilation information
  - More typecasting in deflate.c to avoid warnings
  - Remove leading underscore from _Capital #defines [Truta]
  - Fix configure to link shared library when testing
  - Add some Windows CE target adjustments [Mai]
  - Remove #define ZLIB_DLL in zconf.h [Vollant]
  - Add zlib.3 [Rodgers]
  - Update RFC URL in deflate.c and algorithm.txt [Mai]
  - Add zlib_dll_FAQ.txt to contrib [Truta]
  - Add UL to some constants [Truta]
  - Update minizip and vstudio [Vollant]
  - Remove vestigial NEED_DUMMY_RETURN from zconf.in.h
  - Expand use of NO_DUMMY_DECL to avoid all dummy structures
  - Added iostream3 to contrib [Schwardt]
  - Replace rewind() with fseek() for WinCE [Truta]
  - Improve setting of zlib format compression level flags
      - Report 0 for huffman and rle strategies and for level == 0 or 1
      - Report 2 only for level == 6
  - Only deal with 64K limit when necessary at compile time [Truta]
  - Allow TOO_FAR check to be turned off at compile time [Truta]
  - Add gzclearerr() function [Souza]
  - Add gzungetc() function
  
  Changes in 1.2.0.1 (17 March 2003)
  - Add Z_RLE strategy for run-length encoding [Truta]
      - When Z_RLE requested, restrict matches to distance one
      - Update zlib.h, minigzip.c, gzopen(), gzdopen() for Z_RLE
  - Correct FASTEST compilation to allow level == 0
  - Clean up what gets compiled for FASTEST
  - Incorporate changes to zconf.in.h [Vollant]
      - Refine detection of Turbo C need for dummy returns
      - Refine ZLIB_DLL compilation
      - Include additional header file on VMS for off_t typedef
  - Try to use _vsnprintf where it supplants vsprintf [Vollant]
  - Add some casts in inffast.c
  - Enhance comments in zlib.h on what happens if gzprintf() tries to
    write more than 4095 bytes before compression
  - Remove unused state from inflateBackEnd()
  - Remove exit(0) from minigzip.c, example.c
  - Get rid of all those darn tabs
  - Add "check" target to Makefile.in that does the same thing as "test"
  - Add "mostlyclean" and "maintainer-clean" targets to Makefile.in
  - Update contrib/inflate86 [Anderson]
  - Update contrib/testzlib, contrib/vstudio, contrib/minizip [Vollant]
  - Add msdos and win32 directories with makefiles [Truta]
  - More additions and improvements to the FAQ
  
  Changes in 1.2.0 (9 March 2003)
  - New and improved inflate code
      - About 20% faster
      - Does not allocate 32K window unless and until needed
      - Automatically detects and decompresses gzip streams
      - Raw inflate no longer needs an extra dummy byte at end
      - Added inflateBack functions using a callback interface--even faster
        than inflate, useful for file utilities (gzip, zip)
      - Added inflateCopy() function to record state for random access on
        externally generated deflate streams (e.g. in gzip files)
      - More readable code (I hope)
  - New and improved crc32()
      - About 50% faster, thanks to suggestions from Rodney Brown
  - Add deflateBound() and compressBound() functions
  - Fix memory leak in deflateInit2()
  - Permit setting dictionary for raw deflate (for parallel deflate)
  - Fix const declaration for gzwrite()
  - Check for some malloc() failures in gzio.c
  - Fix bug in gzopen() on single-byte file 0x1f
  - Fix bug in gzread() on concatenated file with 0x1f at end of buffer
    and next buffer doesn't start with 0x8b
  - Fix uncompress() to return Z_DATA_ERROR on truncated input
  - Free memory at end of example.c
  - Remove MAX #define in trees.c (conflicted with some libraries)
  - Fix static const's in deflate.c, gzio.c, and zutil.[ch]
  - Declare malloc() and free() in gzio.c if STDC not defined
  - Use malloc() instead of calloc() in zutil.c if int big enough
  - Define STDC for AIX
  - Add aix/ with approach for compiling shared library on AIX
  - Add HP-UX support for shared libraries in configure
  - Add OpenUNIX support for shared libraries in configure
  - Use $cc instead of gcc to build shared library
  - Make prefix directory if needed when installing
  - Correct Macintosh avoidance of typedef Byte in zconf.h
  - Correct Turbo C memory allocation when under Linux
  - Use libz.a instead of -lz in Makefile (assure use of compiled library)
  - Update configure to check for snprintf or vsnprintf functions and their
    return value, warn during make if using an insecure function
  - Fix configure problem with compile-time knowledge of HAVE_UNISTD_H that
    is lost when library is used--resolution is to build new zconf.h
  - Documentation improvements (in zlib.h):
      - Document raw deflate and inflate
      - Update RFCs URL
      - Point out that zlib and gzip formats are different
      - Note that Z_BUF_ERROR is not fatal
      - Document string limit for gzprintf() and possible buffer overflow
      - Note requirement on avail_out when flushing
      - Note permitted values of flush parameter of inflate()
  - Add some FAQs (and even answers) to the FAQ
  - Add contrib/inflate86/ for x86 faster inflate
  - Add contrib/blast/ for PKWare Data Compression Library decompression
  - Add contrib/puff/ simple inflate for deflate format description
  
  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 occurring 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 generate 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
  - simplified 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()