[REQ] Lossless data (de)compress algorithithm (C/VHDL)

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cube007

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Hello,

For transferring data from a PC to an embedded System via Ethernet (UDP packets) I’m looking for a fast and efficient lossless data (de)compress algorithm in C and/or VHDL. At the moment I’m sending UDP frames with about 22kBytes from the PC to the embedded hardware. With a standard LZH (Lempel-Ziv-Huffman) algorithm the frames can be compressed down to 40%. The current implementation is derived from **broken link removed**. But the code is too slow.

Any recommendations are welcome.

Regards,
cube007
 

dear cube007,

i don't recall any ready-to-use core for solely such thing. However, you might want to have a look at hardware JPEG encoder core at opencores. Huffmann encoding/decoding is part of both JPEG and MPEG.

A suggestion is to use RLE (run-length encoding) followed by Huffmann. Both are found as part of JPEG IPs.

Plus: There floats around the web an old (i think incomplete by a file or two) university project of some course named EE552. They did a lossless data coprocessor of some sort.

best regards mate
the_penetrator©
 

Hello the_penetrator,

Thank you for your contribution. Using some stuff of JPEG is a good idea. There are lot of information about JPEG in web. I will check this.

After doing some more activities to find something useful in the web I come across to https://www.oberhumer.com/. LZO Algorithm seems to be a good alternative for fast compression and decompression.


Bye,
cube007
 

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