1 ------------------------------------------------------------------
2 This file is part of bzip2/libbzip2, a program and library for
3 lossless, block-sorting data compression.
5 bzip2/libbzip2 version 1.0.5 of 10 December 2007
6 Copyright (C) 1996-2007 Julian Seward <jseward@bzip.org>
8 Please read the WARNING, DISCLAIMER and PATENTS sections in the
11 This program is released under the terms of the license contained
13 ------------------------------------------------------------------
23 Removed 'ranlib' from Makefile, since most modern Unix-es
24 don't need it, or even know about it.
29 Fixed a problem with error reporting in bzip2.c. This does not effect
30 the library in any way. Problem is: versions 0.9.0 and 0.9.0a (of the
31 program proper) compress and decompress correctly, but give misleading
32 error messages (internal panics) when an I/O error occurs, instead of
33 reporting the problem correctly. This shouldn't give any data loss
34 (as far as I can see), but is confusing.
36 Made the inline declarations disappear for non-GCC compilers.
41 Fixed some problems in the library pertaining to some boundary cases.
42 This makes the library behave more correctly in those situations. The
43 fixes apply only to features (calls and parameters) not used by
44 bzip2.c, so the non-fixedness of them in previous versions has no
45 effect on reliability of bzip2.c.
48 * made zero-length BZ_FLUSH work correctly in bzCompress().
49 * fixed bzWrite/bzRead to ignore zero-length requests.
50 * fixed bzread to correctly handle read requests after EOF.
51 * wrong parameter order in call to bzDecompressInit in
52 bzBuffToBuffDecompress. Fixed.
55 * changed setting of nGroups in sendMTFValues() so as to
56 do a bit better on small files. This _does_ effect
62 Major change: add a fallback sorting algorithm (blocksort.c)
63 to give reasonable behaviour even for very repetitive inputs.
64 Nuked --repetitive-best and --repetitive-fast since they are
67 Minor changes: mostly a whole bunch of small changes/
68 bugfixes in the driver (bzip2.c). Changes pertaining to the
71 allow decompression of symlink'd files to stdout
72 decompress/test files even without .bz2 extension
73 give more accurate error messages for I/O errors
74 when compressing/decompressing to stdout, don't catch control-C
75 read flags from BZIP2 and BZIP environment variables
76 decline to break hard links to a file unless forced with -f
77 allow -c flag even with no filenames
78 preserve file ownerships as far as possible
79 make -s -1 give the expected block size (100k)
80 add a flag -q --quiet to suppress nonessential warnings
81 stop decoding flags after --, so files beginning in - can be handled
82 resolved inconsistent naming: bzcat or bz2cat ?
83 bzip2 --help now returns 0
85 Programming-level changes are:
87 fixed syntax error in GET_LL4 for Borland C++ 5.02
88 let bzBuffToBuffDecompress return BZ_DATA_ERROR{_MAGIC}
89 fix overshoot of mode-string end in bzopen_or_bzdopen
90 wrapped bzlib.h in #ifdef __cplusplus ... extern "C" { ... }
91 close file handles under all error conditions
92 added minor mods so it compiles with DJGPP out of the box
93 fixed Makefile so it doesn't give problems with BSD make
94 fix uninitialised memory reads in dlltest.c
98 Open stdin/stdout in binary mode for DJGPP.
102 Changed BZ_N_OVERSHOOT to be ... + 2 instead of ... + 1. The + 1
103 version could cause the sorted order to be wrong in some extremely
104 obscure cases. Also changed setting of quadrant in blocksort.c.
108 The only functional change is to make bzlibVersion() in the library
109 return the correct string. This has no effect whatsoever on the
110 functioning of the bzip2 program or library. Added a couple of casts
111 so the library compiles without warnings at level 3 in MS Visual
112 Studio 6.0. Included a Y2K statement in the file Y2K_INFO. All other
113 changes are minor documentation changes.
117 Several minor bugfixes and enhancements:
119 * Large file support. The library uses 64-bit counters to
120 count the volume of data passing through it. bzip2.c
121 is now compiled with -D_FILE_OFFSET_BITS=64 to get large
122 file support from the C library. -v correctly prints out
123 file sizes greater than 4 gigabytes. All these changes have
124 been made without assuming a 64-bit platform or a C compiler
125 which supports 64-bit ints, so, except for the C library
126 aspect, they are fully portable.
128 * Decompression robustness. The library/program should be
129 robust to any corruption of compressed data, detecting and
130 handling _all_ corruption, instead of merely relying on
131 the CRCs. What this means is that the program should
132 never crash, given corrupted data, and the library should
133 always return BZ_DATA_ERROR.
135 * Fixed an obscure race-condition bug only ever observed on
136 Solaris, in which, if you were very unlucky and issued
137 control-C at exactly the wrong time, both input and output
138 files would be deleted.
140 * Don't run out of file handles on test/decompression when
141 large numbers of files have invalid magic numbers.
143 * Avoid library namespace pollution. Prefix all exported
146 * Minor sorting enhancements from my DCC2000 paper.
148 * Advance the version number to 1.0, so as to counteract the
149 (false-in-this-case) impression some people have that programs
150 with version numbers less than 1.0 are in some way, experimental,
151 pre-release versions.
153 * Create an initial Makefile-libbz2_so to build a shared library.
154 Yes, I know I should really use libtool et al ...
156 * Make the program exit with 2 instead of 0 when decompression
157 fails due to a bad magic number (ie, an invalid bzip2 header).
158 Also exit with 1 (as the manual claims :-) whenever a diagnostic
159 message would have been printed AND the corresponding operation
160 is aborted, for example
161 bzip2: Output file xx already exists.
162 When a diagnostic message is printed but the operation is not
164 bzip2: Can't guess original name for wurble -- using wurble.out
165 then the exit value 0 is returned, unless some other problem is
168 I think it corresponds more closely to what the manual claims now.
173 * Modified dlltest.c so it uses the new BZ2_ naming scheme.
174 * Modified makefile-msc to fix minor build probs on Win2k.
175 * Updated README.COMPILATION.PROBLEMS.
177 There are no functionality changes or bug fixes relative to version
178 1.0.0. This is just a documentation update + a fix for minor Win32
179 build problems. For almost everyone, upgrading from 1.0.0 to 1.0.1 is
180 utterly pointless. Don't bother.
185 A bug fix release, addressing various minor issues which have appeared
186 in the 18 or so months since 1.0.1 was released. Most of the fixes
187 are to do with file-handling or documentation bugs. To the best of my
188 knowledge, there have been no data-loss-causing bugs reported in the
189 compression/decompression engine of 1.0.0 or 1.0.1.
191 Note that this release does not improve the rather crude build system
192 for Unix platforms. The general plan here is to autoconfiscate/
193 libtoolise 1.0.2 soon after release, and release the result as 1.1.0
194 or perhaps 1.2.0. That, however, is still just a plan at this point.
196 Here are the changes in 1.0.2. Bug-reporters and/or patch-senders in
199 * Fix an infinite segfault loop in 1.0.1 when a directory is
200 encountered in -f (force) mode.
201 (Trond Eivind Glomsrod, Nicholas Nethercote, Volker Schmidt)
203 * Avoid double fclose() of output file on certain I/O error paths.
206 * Don't fail with internal error 1007 when fed a long stream (> 48MB)
207 of byte 251. Also print useful message suggesting that 1007s may be
208 caused by bad memory.
209 (noticed by Juan Pedro Vallejo, fixed by me)
211 * Fix uninitialised variable silly bug in demo prog dlltest.c.
214 * Remove 512-MB limitation on recovered file size for bzip2recover
215 on selected platforms which support 64-bit ints. At the moment
216 all GCC supported platforms, and Win32.
217 (me, Alson van der Meulen)
219 * Hard-code header byte values, to give correct operation on platforms
220 using EBCDIC as their native character set (IBM's OS/390).
223 * Copy file access times correctly.
226 * Add distclean and check targets to Makefile.
229 * Parameterise use of ar and ranlib in Makefile. Also add $(LDFLAGS).
230 (Rich Ireland, Bo Thorsen)
232 * Pass -p (create parent dirs as needed) to mkdir during make install.
235 * Dereference symlinks when copying file permissions in -f mode.
238 * Majorly simplify implementation of uInt64_qrm10.
241 * Check the input file still exists before deleting the output one,
242 when aborting in cleanUpAndFail().
243 (Joerg Prante, Robert Linden, Matthias Krings)
245 Also a bunch of patches courtesy of Philippe Troin, the Debian maintainer
248 * Wrapper scripts (with manpages): bzdiff, bzgrep, bzmore.
250 * Spelling changes and minor enhancements in bzip2.1.
252 * Avoid race condition between creating the output file and setting its
253 interim permissions safely, by using fopen_output_safely().
254 No changes to bzip2recover since there is no issue with file
257 * do not print senseless report with -v when compressing an empty
260 * bzcat -f works on non-bzip2 files.
262 * do not try to escape shell meta-characters on unix (the shell takes
265 * added --fast and --best aliases for -1 -9 for gzip compatibility.
270 Fixes some minor bugs since the last version, 1.0.2.
272 * Further robustification against corrupted compressed data.
273 There are currently no known bitstreams which can cause the
274 decompressor to crash, loop or access memory which does not
275 belong to it. If you are using bzip2 or the library to
276 decompress bitstreams from untrusted sources, an upgrade
277 to 1.0.3 is recommended. This fixes CAN-2005-1260.
279 * The documentation has been converted to XML, from which html
280 and pdf can be derived.
282 * Various minor bugs in the documentation have been fixed.
284 * Fixes for various compilation warnings with newer versions of
285 gcc, and on 64-bit platforms.
287 * The BZ_NO_STDIO cpp symbol was not properly observed in 1.0.2.
293 Fixes some minor bugs since the last version, 1.0.3.
295 * Fix file permissions race problem (CAN-2005-0953).
297 * Avoid possible segfault in BZ2_bzclose. From Coverity's NetBSD
300 * 'const'/prototype cleanups in the C code.
302 * Change default install location to /usr/local, and handle multiple
303 'make install's without error.
305 * Sanitise file names more carefully in bzgrep. Fixes CAN-2005-0758
306 to the extent that applies to bzgrep.
308 * Use 'mktemp' rather than 'tempfile' in bzdiff.
310 * Tighten up a couple of assertions in blocksort.c following automated
313 * Fix minor doc/comment bugs.
318 Security fix only. Fixes CERT-FI 20469 as it applies to bzip2.