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 Readme for:  Development » Library » Misc » bcl.lha

Bcl

Description: Basic Compression Library
Download: bcl.lha       (TIPS: Use the right click menu if your browser takes you back here all the time)
Size: 174kb
Version: 1.2.0svn30
Date: 25 Apr 2011
Author: Marcus Geelnard, aos4 port by kas1e
Submitter: kas1e
Email: kas1e/yandex ru
Homepage: http://bcl.comli.eu/
Category: development/library/misc
License: Other
Distribute: yes
Min OS Version: 4.0
FileID: 6355
 
Comments: 0
Snapshots: 0
Videos: 0
Downloads: 106  (Current version)
106  (Accumulated)
Votes: 0 (0/0)  (30 days/7 days)

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    Basic Compression Library
    
    http://bcl.comli.eu/

    by Marcus Geelnard

    Version 1.2.0    
    SVN #30 (jul 5 2010)
  
    AmigaOS4 port by kas1e    

  Introduction

  The Basic Compression Library is a library of well known compression
algorithms implemented in portable ANSI C code.

  For more information about the Basic Compression Library, please read the
manual and, of course, the source code.


  Version History
 
  1.2.0-svn30 (2010.07.05)
  
    Improved the LZ77-coder by allowing runs past the current buffer position
(effectively allowing RLE-like behavior). The decompression routine is
unaffected.

  1.2.0-svn29 (2007.04.18)
    
    Added output buffer overflow checking to the RLE compression/decompression
routines. Also, the function call prototypes were changed.
    Updated the test program to the new RLE function calling syntax, and added a
-v command line option (verbose).
    Updated the file compression utility to the new RLE function call syntax.
  
  1.2.0 (2006.07.22)

    As Tomasz Cichocki kindly pointed out, the Huffman coder that was
implemented in versions 1.1.3 and earlier was actually a Shannon-Fano coder. The
coder was accordingly renamed.
    A new, true Huffman coder was created. It is very similar to the
Shannon-Fano coder, but it compresses slightly better. The new Huffman decoder
is not compatible with the Huffman decoder in version 1.1.3, so it can not
handle compressed data generated with older versions of the library.
    Fixed a compilation warning for Visual C++ in the LZ coder (thanks Yuval
Ofer!).

  1.1.3 (2006.07.06)

    Improved the Huffman decompression speed with about 400%, and at the same
time made the source code easier to understand (hopefully).

  1.1.2 (2006.06.26)

    The "fast" LZ compression algortihm is now even faster, since the search
window is limited, just as it is in the standard LZ compression algorithm.
    The test application (bcltester) now measures the compression and
decompression speeds.
    Removed the -Wtraditional flag from the Makefile.
    Updated some paragraphs in the documentation.
    Changed the readme-file from text to HTML.
    Moved from CVS to Subversion revision control system.

  1.1.1 (2004.12.25)

    Bugfix in rle.c: When exactly three sequential bytes equal to the marker
byte occured in the input stream, the coder output one byte too many.

  1.1.0 (2004.12.14)

    Bugfix in rice.c: Changed internal signed magnitude format in order to
support all possible signed values. As a result, data that has been compressed
with rice.c in v1.0.6 is no longer compatible with v1.1.0!
    Bugfix in huffman.c: The Huffman tree was not optimally balanced, so
incompressible data would overflow the output buffer (effectively rendering the
compressed data invalid). The fixed Huffman coder should compress slightly
better than the old 1.0.6 coder.
    A new faster LZ77 coder (LZ_CompressFast).
    Added a compression test utility (bcltester.c).

  1.0.6 (2004.05.22)

    Bugfix in the LZ77 decoder.

  1.0.5 (2004.05.09)

    Added a LZ77 coder/decoder.

  1.0.4 (2004.04.21)

    Bugfix in rle.c: Long runs would be truncated (thanks Steve!).

  1.0.3 (2004.02.17)

    The project was moved to Sourceforge.
    Changed license to the zlib license.

  1.0.2 (2003.10.04)

    Improved Rice compression.

  1.0.1 (2003.10.01)

    Added Rice compression.
    Added bfc, the Basic File Compressor :)

  1.0.0 (2003.09.29)

    Initial release.
    RLE and Huffman compression



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