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Asked: 2026-05-22T02:06:51+00:00

Does anyone know of a free (non-GPL), decently performing compression library that supports packet

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Does anyone know of a free (non-GPL), decently performing compression library that supports packet oriented compression in C/C++?

With packet oriented, I mean the kind of feature QuickLZ (GPL) has, where multiple packets of a stream can be compressed and decompressed individually while a history is being maintained across packets to achieve sensible compression.

I’d favor compression ratio over CPU usage as long as the CPU usage isn’t ridiculous, but I’ve had a hard time finding this feature at all, so anything is of interest.

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  1. Editorial Team

    zlib’s main deflate() function takes a flush parameter, which allows various different flushing modes. If you pass Z_SYNC_FLUSH at the end of each packet, that should produce the desired effect.

    The details are explained in the zLib manual.

    bzip2 has flushing functionality as well, which might let you do this kind of thing. See http://www.bzip.org/1.0.5/bzip2-manual-1.0.5.html#bzCompress

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