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Thread: Identifying unknown compression

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    Identifying unknown compression

    Hello all,

    I have a large number of files (text and images) using a unknown compression type from a old 2003 game.

    I have also obtained some of the files in decompressed from and verified they were the same as their compressed counterparts using their associated CRC32 hashes.


    I think it may be some form of run-length encoding but I am new to compression and need help identifying it.

    Attached is a zip of 2 files in compressed and decompressed form.


    The compression appears to have no header, but all compressed files start with a sequence of nulls.

    The compressed files also seem to have nulls seemingly randomly placed throughout the file - does anyone know what purpose this would serve?


    If it is not a standard form of compression, I would really appreciate if someone could explain the first few lines of one of the compressed files to me.


    Thanks in advance for your time and effort!

    Click image for larger version. 

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    Last edited by McGee; 24th October 2015 at 20:20.

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    Okay, so after examining the files closer they seem to use LZRW3 for compression.

    This thread is now solved

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