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 This file is part of bzip2/libbzip2, a program and library for
 lossless, block-sorting data compression.

Please read the WARNING, DISCLAIMER and PATENTS sections in the 
 README file.

This program is released under the terms of the license contained
 in the file LICENSE.
 ------------------------------------------------------------------

0.9.0
~~~~~
First version.

0.9.0a
~~~~~~
Removed 'ranlib' from Makefile, since most modern Unix-es 
don't need it, or even know about it.

0.9.0b
~~~~~~
Fixed a problem with error reporting in bzip2.c.  This does not effect
the library in any way.  Problem is: versions 0.9.0 and 0.9.0a (of the
program proper) compress and decompress correctly, but give misleading
error messages (internal panics) when an I/O error occurs, instead of
reporting the problem correctly.  This shouldn't give any data loss
(as far as I can see), but is confusing.

Made the inline declarations disappear for non-GCC compilers.

0.9.0c
~~~~~~
Fixed some problems in the library pertaining to some boundary cases.
This makes the library behave more correctly in those situations.  The
fixes apply only to features (calls and parameters) not used by
bzip2.c, so the non-fixedness of them in previous versions has no
effect on reliability of bzip2.c.

In bzlib.c:
   * made zero-length BZ_FLUSH work correctly in bzCompress().
   * fixed bzWrite/bzRead to ignore zero-length requests.
   * fixed bzread to correctly handle read requests after EOF.
   * wrong parameter order in call to bzDecompressInit in
     bzBuffToBuffDecompress.  Fixed.

In compress.c:
   * changed setting of nGroups in sendMTFValues() so as to 
     do a bit better on small files.  This _does_ effect
     bzip2.c.

0.9.5a
~~~~~~
Major change: add a fallback sorting algorithm (blocksort.c)
to give reasonable behaviour even for very repetitive inputs.
Nuked --repetitive-best and --repetitive-fast since they are
no longer useful.

Minor changes: mostly a whole bunch of small changes/
bugfixes in the driver (bzip2.c).  Changes pertaining to the
user interface are:

allow decompression of symlink'd files to stdout
   decompress/test files even without .bz2 extension
   give more accurate error messages for I/O errors
   when compressing/decompressing to stdout, don't catch control-C
   read flags from BZIP2 and BZIP environment variables
   decline to break hard links to a file unless forced with -f
   allow -c flag even with no filenames
   preserve file ownerships as far as possible
   make -s -1 give the expected block size (100k)
   add a flag -q --quiet to suppress nonessential warnings
   stop decoding flags after --, so files beginning in - can be handled
   resolved inconsistent naming: bzcat or bz2cat ?
   bzip2 --help now returns 0

Programming-level changes are:

fixed syntax error in GET_LL4 for Borland C++ 5.02
   let bzBuffToBuffDecompress return BZ_DATA_ERROR{_MAGIC}
   fix overshoot of mode-string end in bzopen_or_bzdopen
   wrapped bzlib.h in #ifdef __cplusplus ... extern "C" { ... }
   close file handles under all error conditions
   added minor mods so it compiles with DJGPP out of the box
   fixed Makefile so it doesn't give problems with BSD make
   fix uninitialised memory reads in dlltest.c

0.9.5b
~~~~~~
Open stdin/stdout in binary mode for DJGPP.

0.9.5c
~~~~~~
Changed BZ_N_OVERSHOOT to be ... + 2 instead of ... + 1.  The + 1
version could cause the sorted order to be wrong in some extremely
obscure cases.  Also changed setting of quadrant in blocksort.c.

0.9.5d
~~~~~~
The only functional change is to make bzlibVersion() in the library
return the correct string.  This has no effect whatsoever on the
functioning of the bzip2 program or library.  Added a couple of casts
so the library compiles without warnings at level 3 in MS Visual
Studio 6.0.  Included a Y2K statement in the file Y2K_INFO.  All other
changes are minor documentation changes.

1.0
~~~
Several minor bugfixes and enhancements:

* Large file support.  The library uses 64-bit counters to
  count the volume of data passing through it.  bzip2.c 
  is now compiled with -D_FILE_OFFSET_BITS=64 to get large
  file support from the C library.  -v correctly prints out
  file sizes greater than 4 gigabytes.  All these changes have
  been made without assuming a 64-bit platform or a C compiler
  which supports 64-bit ints, so, except for the C library
  aspect, they are fully portable.

* Decompression robustness.  The library/program should be
  robust to any corruption of compressed data, detecting and
  handling _all_ corruption, instead of merely relying on
  the CRCs.  What this means is that the program should 
  never crash, given corrupted data, and the library should
  always return BZ_DATA_ERROR.

* Fixed an obscure race-condition bug only ever observed on
  Solaris, in which, if you were very unlucky and issued
  control-C at exactly the wrong time, both input and output
  files would be deleted.

* Don't run out of file handles on test/decompression when
  large numbers of files have invalid magic numbers.

* Avoid library namespace pollution.  Prefix all exported 
  symbols with BZ2_.

* Minor sorting enhancements from my DCC2000 paper.

* Advance the version number to 1.0, so as to counteract the
  (false-in-this-case) impression some people have that programs 
  with version numbers less than 1.0 are in some way, experimental,
  pre-release versions.

* Create an initial Makefile-libbz2_so to build a shared library.
  Yes, I know I should really use libtool et al ...

* Make the program exit with 2 instead of 0 when decompression
  fails due to a bad magic number (ie, an invalid bzip2 header).
  Also exit with 1 (as the manual claims :-) whenever a diagnostic
  message would have been printed AND the corresponding operation 
  is aborted, for example
     bzip2: Output file xx already exists.
  When a diagnostic message is printed but the operation is not 
  aborted, for example
     bzip2: Can't guess original name for wurble -- using wurble.out
  then the exit value 0 is returned, unless some other problem is
  also detected.

I think it corresponds more closely to what the manual claims now.

1.0.1
~~~~~
* Modified dlltest.c so it uses the new BZ2_ naming scheme.
* Modified makefile-msc to fix minor build probs on Win2k.
* Updated README.COMPILATION.PROBLEMS.

There are no functionality changes or bug fixes relative to version
1.0.0.  This is just a documentation update + a fix for minor Win32
build problems.  For almost everyone, upgrading from 1.0.0 to 1.0.1 is
utterly pointless.  Don't bother.

1.0.2
~~~~~
A bug fix release, addressing various minor issues which have appeared
in the 18 or so months since 1.0.1 was released.  Most of the fixes
are to do with file-handling or documentation bugs.  To the best of my
knowledge, there have been no data-loss-causing bugs reported in the
compression/decompression engine of 1.0.0 or 1.0.1.

Note that this release does not improve the rather crude build system
for Unix platforms.  The general plan here is to autoconfiscate/
libtoolise 1.0.2 soon after release, and release the result as 1.1.0
or perhaps 1.2.0.  That, however, is still just a plan at this point.

Here are the changes in 1.0.2.  Bug-reporters and/or patch-senders in
parentheses.

* Fix an infinite segfault loop in 1.0.1 when a directory is
  encountered in -f (force) mode.
     (Trond Eivind Glomsrod, Nicholas Nethercote, Volker Schmidt)

* Avoid double fclose() of output file on certain I/O error paths.
     (Solar Designer)

* Don't fail with internal error 1007 when fed a long stream (> 48MB)
  of byte 251.  Also print useful message suggesting that 1007s may be
  caused by bad memory.
     (noticed by Juan Pedro Vallejo, fixed by me)

* Fix uninitialised variable silly bug in demo prog dlltest.c.
     (Jorj Bauer)

* Remove 512-MB limitation on recovered file size for bzip2recover
  on selected platforms which support 64-bit ints.  At the moment
  all GCC supported platforms, and Win32.
     (me, Alson van der Meulen)

* Hard-code header byte values, to give correct operation on platforms
  using EBCDIC as their native character set (IBM's OS/390).
     (Leland Lucius)

* Copy file access times correctly.
     (Marty Leisner)

* Add distclean and check targets to Makefile.
     (Michael Carmack)

* Parameterise use of ar and ranlib in Makefile.  Also add $(LDFLAGS).
     (Rich Ireland, Bo Thorsen)

* Pass -p (create parent dirs as needed) to mkdir during make install.
     (Jeremy Fusco)

* Dereference symlinks when copying file permissions in -f mode.
     (Volker Schmidt)

* Majorly simplify implementation of uInt64_qrm10.
     (Bo Lindbergh)

* Check the input file still exists before deleting the output one,
  when aborting in cleanUpAndFail().
     (Joerg Prante, Robert Linden, Matthias Krings)

Also a bunch of patches courtesy of Philippe Troin, the Debian maintainer
of bzip2:

* Wrapper scripts (with manpages): bzdiff, bzgrep, bzmore.

* Spelling changes and minor enhancements in bzip2.1.

* Avoid race condition between creating the output file and setting its
  interim permissions safely, by using fopen_output_safely().
  No changes to bzip2recover since there is no issue with file
  permissions there.

* do not print senseless report with -v when compressing an empty
  file.

* bzcat -f works on non-bzip2 files.

* do not try to escape shell meta-characters on unix (the shell takes
  care of these).

* added --fast and --best aliases for -1 -9 for gzip compatibility.

1.0.3 (15 Feb 05)
~~~~~~~~~~~~~~~~~
Fixes some minor bugs since the last version, 1.0.2.

* Further robustification against corrupted compressed data.
  There are currently no known bitstreams which can cause the
  decompressor to crash, loop or access memory which does not
  belong to it.  If you are using bzip2 or the library to 
  decompress bitstreams from untrusted sources, an upgrade
  to 1.0.3 is recommended.  This fixes CAN-2005-1260.

* The documentation has been converted to XML, from which html
  and pdf can be derived.

* Various minor bugs in the documentation have been fixed.

* Fixes for various compilation warnings with newer versions of
  gcc, and on 64-bit platforms.

* The BZ_NO_STDIO cpp symbol was not properly observed in 1.0.2.
  This has been fixed.

1.0.4 (20 Dec 06)
~~~~~~~~~~~~~~~~~
Fixes some minor bugs since the last version, 1.0.3.

* Fix file permissions race problem (CAN-2005-0953).

* Avoid possible segfault in BZ2_bzclose.  From Coverity's NetBSD
  scan.

* 'const'/prototype cleanups in the C code.

* Change default install location to /usr/local, and handle multiple
  'make install's without error.

* Sanitise file names more carefully in bzgrep.  Fixes CAN-2005-0758
  to the extent that applies to bzgrep.

* Use 'mktemp' rather than 'tempfile' in bzdiff.

* Tighten up a couple of assertions in blocksort.c following automated
  analysis.

* Fix minor doc/comment bugs.

1.0.5 (10 Dec 07)
~~~~~~~~~~~~~~~~~
Security fix only.  Fixes CERT-FI 20469 as it applies to bzip2.

1.0.6 (6 Sept 10)
~~~~~~~~~~~~~~~~~

* Security fix for CVE-2010-0405.  This was reported by Mikolaj
  Izdebski.

* Make the documentation build on Ubuntu 10.04
PK�����gn�\@mCcm��m����LICENSEnu��[�����������
--------------------------------------------------------------------------

This program, "bzip2", the associated library "libbzip2", and all
documentation, are copyright (C) 1996-2010 Julian R Seward.  All
rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

2. The origin of this software must not be misrepresented; you must 
   not claim that you wrote the original software.  If you use this 
   software in a product, an acknowledgment in the product 
   documentation would be appreciated but is not required.

3. Altered source versions must be plainly marked as such, and must
   not be misrepresented as being the original software.

4. The name of the author may not be used to endorse or promote 
   products derived from this software without specific prior written 
   permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Julian Seward, jseward@bzip.org
bzip2/libbzip2 version 1.0.6 of 6 September 2010

--------------------------------------------------------------------------
PK�����gn�\��4��������READMEnu��[�����������
This is the README for bzip2/libzip2.
This version is fully compatible with the previous public releases.

------------------------------------------------------------------
This file is part of bzip2/libbzip2, a program and library for
lossless, block-sorting data compression.

Please read the WARNING, DISCLAIMER and PATENTS sections in this file.

This program is released under the terms of the license contained
in the file LICENSE.
------------------------------------------------------------------

Complete documentation is available in Postscript form (manual.ps),
PDF (manual.pdf) or html (manual.html).  A plain-text version of the
manual page is available as bzip2.txt.

HOW TO BUILD -- UNIX

Type 'make'.  This builds the library libbz2.a and then the programs
bzip2 and bzip2recover.  Six self-tests are run.  If the self-tests
complete ok, carry on to installation:

To install in /usr/local/bin, /usr/local/lib, /usr/local/man and
/usr/local/include, type

make install

To install somewhere else, eg, /xxx/yyy/{bin,lib,man,include}, type

make install PREFIX=/xxx/yyy

If you are (justifiably) paranoid and want to see what 'make install'
is going to do, you can first do

make -n install                      or
   make -n install PREFIX=/xxx/yyy      respectively.

The -n instructs make to show the commands it would execute, but not
actually execute them.

HOW TO BUILD -- UNIX, shared library libbz2.so.

Do 'make -f Makefile-libbz2_so'.  This Makefile seems to work for
Linux-ELF (RedHat 7.2 on an x86 box), with gcc.  I make no claims
that it works for any other platform, though I suspect it probably
will work for most platforms employing both ELF and gcc.

bzip2-shared, a client of the shared library, is also built, but not
self-tested.  So I suggest you also build using the normal Makefile,
since that conducts a self-test.  A second reason to prefer the
version statically linked to the library is that, on x86 platforms,
building shared objects makes a valuable register (%ebx) unavailable
to gcc, resulting in a slowdown of 10%-20%, at least for bzip2.

Important note for people upgrading .so's from 0.9.0/0.9.5 to version
1.0.X.  All the functions in the library have been renamed, from (eg)
bzCompress to BZ2_bzCompress, to avoid namespace pollution.
Unfortunately this means that the libbz2.so created by
Makefile-libbz2_so will not work with any program which used an older
version of the library.  I do encourage library clients to make the
effort to upgrade to use version 1.0, since it is both faster and more
robust than previous versions.

HOW TO BUILD -- Windows 95, NT, DOS, Mac, etc.

It's difficult for me to support compilation on all these platforms.
My approach is to collect binaries for these platforms, and put them
on the master web site (http://www.bzip.org).  Look there.  However
(FWIW), bzip2-1.0.X is very standard ANSI C and should compile
unmodified with MS Visual C.  If you have difficulties building, you
might want to read README.COMPILATION.PROBLEMS.

At least using MS Visual C++ 6, you can build from the unmodified
sources by issuing, in a command shell:

nmake -f makefile.msc

(you may need to first run the MSVC-provided script VCVARS32.BAT
 so as to set up paths to the MSVC tools correctly).

VALIDATION

Correct operation, in the sense that a compressed file can always be
decompressed to reproduce the original, is obviously of paramount
importance.  To validate bzip2, I used a modified version of Mark
Nelson's churn program.  Churn is an automated test driver which
recursively traverses a directory structure, using bzip2 to compress
and then decompress each file it encounters, and checking that the
decompressed data is the same as the original.

Please read and be aware of the following:

WARNING:

This program and library (attempts to) compress data by 
   performing several non-trivial transformations on it.  
   Unless you are 100% familiar with *all* the algorithms 
   contained herein, and with the consequences of modifying them, 
   you should NOT meddle with the compression or decompression 
   machinery.  Incorrect changes can and very likely *will* 
   lead to disastrous loss of data.

DISCLAIMER:

I TAKE NO RESPONSIBILITY FOR ANY LOSS OF DATA ARISING FROM THE
   USE OF THIS PROGRAM/LIBRARY, HOWSOEVER CAUSED.

Every compression of a file implies an assumption that the
   compressed file can be decompressed to reproduce the original.
   Great efforts in design, coding and testing have been made to
   ensure that this program works correctly.  However, the complexity
   of the algorithms, and, in particular, the presence of various
   special cases in the code which occur with very low but non-zero
   probability make it impossible to rule out the possibility of bugs
   remaining in the program.  DO NOT COMPRESS ANY DATA WITH THIS
   PROGRAM UNLESS YOU ARE PREPARED TO ACCEPT THE POSSIBILITY, HOWEVER
   SMALL, THAT THE DATA WILL NOT BE RECOVERABLE.

That is not to say this program is inherently unreliable.  
   Indeed, I very much hope the opposite is true.  bzip2/libbzip2 
   has been carefully constructed and extensively tested.

PATENTS:

To the best of my knowledge, bzip2/libbzip2 does not use any 
   patented algorithms.  However, I do not have the resources 
   to carry out a patent search.  Therefore I cannot give any 
   guarantee of the above statement.

WHAT'S NEW IN 0.9.0 (as compared to 0.1pl2) ?

* Approx 10% faster compression, 30% faster decompression
   * -t (test mode) is a lot quicker
   * Can decompress concatenated compressed files
   * Programming interface, so programs can directly read/write .bz2 files
   * Less restrictive (BSD-style) licensing
   * Flag handling more compatible with GNU gzip
   * Much more documentation, i.e., a proper user manual
   * Hopefully, improved portability (at least of the library)

WHAT'S NEW IN 0.9.5 ?

* Compression speed is much less sensitive to the input
     data than in previous versions.  Specifically, the very
     slow performance caused by repetitive data is fixed.
   * Many small improvements in file and flag handling.
   * A Y2K statement.

WHAT'S NEW IN 1.0.0 ?

See the CHANGES file.

WHAT'S NEW IN 1.0.2 ?

See the CHANGES file.

WHAT'S NEW IN 1.0.3 ?

See the CHANGES file.

WHAT'S NEW IN 1.0.4 ?

See the CHANGES file.

WHAT'S NEW IN 1.0.5 ?

See the CHANGES file.

WHAT'S NEW IN 1.0.6 ?

See the CHANGES file.

I hope you find bzip2 useful.  Feel free to contact me at
   jseward@bzip.org
if you have any suggestions or queries.  Many people mailed me with
comments, suggestions and patches after the releases of bzip-0.15,
bzip-0.21, and bzip2 versions 0.1pl2, 0.9.0, 0.9.5, 1.0.0, 1.0.1,
1.0.2 and 1.0.3, and the changes in bzip2 are largely a result of this
feedback.  I thank you for your comments.

bzip2's "home" is http://www.bzip.org/

Julian Seward
jseward@bzip.org
Cambridge, UK.

18     July 1996 (version 0.15)
25   August 1996 (version 0.21)
 7   August 1997 (bzip2, version 0.1)
29   August 1997 (bzip2, version 0.1pl2)
23   August 1998 (bzip2, version 0.9.0)
 8     June 1999 (bzip2, version 0.9.5)
 4     Sept 1999 (bzip2, version 0.9.5d)
 5      May 2000 (bzip2, version 1.0pre8)
30 December 2001 (bzip2, version 1.0.2pre1)
15 February 2005 (bzip2, version 1.0.3)
20 December 2006 (bzip2, version 1.0.4)
10 December 2007 (bzip2, version 1.0.5)
 6     Sept 2010 (bzip2, version 1.0.6)
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