Rick Fochtman wrote: > I'm planning to unbutton ARCHIVER (CBT File 147) and will > be considering the replacement of the current Huffman tree > compression with LZW, if I can code it to be more efficient > in Assembler. I've been told by several users that while the > compression seems fairly quick, the "uncompression" seems to > be rather CPU intensive. Before anyone goes looking, please > remember that I wrote that code years ago, under MVS SP1.3. > I've also found that some load module records grow, rather > than shrink, when I apply the Huffman compression technique > to them, resulting in ABENDs.
Between the unix (GNU) source to compress.c and the original LZW paper, it isn't too hard to figure out. I wrote one once using those. There might also be an explanation in the PDF documentation, as it is one of the compression methods used for PDF files. -- glen ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
