Is there an open-source implementation of the Dictionary Huffman compression algorithm?

I'm working on a library to work with Mobipocket-format ebook files, and I have LZ77-style PalmDoc decompression and compression working. However开发者_运维技巧, PalmDoc compression is only one of the two currently-used types of text compression being used on ebooks in the wild, the other being Dictionary Huffman aka huffcdic.

I've found a couple of implementations of the huffcdic decoding algorithm, but I'd like to be able to compress to the same format, and so far I haven't been able to find any examples of how to do that yet. Has someone else already figured this out and published the code?

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i have been trying to use http://bazaar.launchpad.net/~kovid/calibre/trunk/view/head:/src/calibre/ebooks/compression/palmdoc.c but compression doesnt produce identical results, & there are 3 - 4 descrepencies also read one related thread LZ77 compression of palmdoc