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Pakolmo, posted Mon Apr 15, 2019 7:06 pm (46977)

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I have a lot of *.RCS with LZS compression

Aluigi, can you do a script to compress and decompress the RCS files?

https://www.dropbox.com/s/qgfw74v79atkn ... t.rcs?dl=0

IDontKnowMuch, posted Mon Apr 15, 2019 8:55 pm (46980)

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I'm not Aluigi but here you go To recompress, run quickbms with the -r option

LZS decompress.bms

Pakolmo, posted Mon Apr 15, 2019 9:14 pm (46981)

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Thanks, but I can decompress, but no compress...

aluigi, posted Mon Apr 15, 2019 10:06 pm (46986)

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The correct decompression script is:

Code:

    comtype lzs
    get ZSIZE asize
    xmath SIZE "ZSIZE * 10"
    get NAME basename
    clog NAME 0 ZSIZE SIZE

I don't know where is the rdesktop compression code, I see mppc_expand but not the compression.

IDontKnowMuch, posted Mon Apr 15, 2019 11:17 pm (46988)

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Sorry I'm still pretty new to this, especially compression types. I was skeptical that the decompressed size was the same as the compressed size but it seemed to accept it

chrrox, posted Mon Apr 15, 2019 11:29 pm (46990)

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this page?
https://github.com/FreeRDP/FreeRDP/blob ... dec/mppc.c
int mppc_compress(MPPC_CONTEXT* mppc, BYTE* pSrcData, UINT32 SrcSize, BYTE** ppDstData,
UINT32* pDstSize, UINT32* pFlags)

aluigi, posted Tue Apr 16, 2019 11:26 am (46998)

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Good but not so easy.

The compressed data doesn't work, it's something related to the history size probably but no solution yet.

aluigi, posted Tue Apr 16, 2019 11:43 am (47000)

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I confirm, it's not 100% compatible.