ryandrake08/lzhl

liblzhl - LZH-Light compression/decompression library

liblzhl - LZH-Light compression/decompression library

This is an implementation of An Algorithm for Online Data Compression.

Origin

I could find two existing implementations of this code on the Internet:

• The J2K Library project, which appears to be the original implementation
• This implementation, which looks like part of a Windows tool

I forked the second one, and made the following changes:

• Got everything compiling with g++ and clang, on both Mac OSX and Linux
• Removed a bunch of non-portable Windows-isms
• Fixed a buffer overrun (read past end of array)
• Fixed some type mismatch warnings
• Fixed case-sensitivity trouble in the #includes
• Cleaned up the C API
• Added a rudimentary test program
• Re-indented a few messy spots

Future

One day, I may get around to fixing up all the nasty int-long casts and re-doing this in more modern C++ style, but for now I'm just hoping that providing the existing code as a standalone project is useful to someone.

Building

make

Testing

Only a basic test program is supplied:

make test
./test

Resources

A collection of helpful links

• An Algorithm for Online Data Compression
• Dr.Dobb's link
• J2K Library (original code)
• Another derived implementation

License

liblzhl is released under the GNU LGPL as required by http://j2k.sourceforge.net/faq.shtml