XeNTaX

Hello,

in CoDBO3 there are FD files which are not encrypted, and I assume they would contain localization files. After signature, there's ZLIB compressed data. After decompressing, there seems to be yet another compression method used. It's possibly something dictionary based. Thanks for any collaboration.

Pictures of the inner compression:


Link to ZLIB decompressed blocks: https://www.sendspace.com/file/ntktcg

mix wrote:Hello,

in CoDBO3 there are FD files which are not encrypted, and I assume they would contain localization files. After signature, there's ZLIB compressed data. After decompressing, there seems to be yet another compression method used. It's possibly something dictionary based. Thanks for any collaboration.

Pictures of the inner compression:


Link to ZLIB decompressed blocks: https://www.sendspace.com/file/ntktcg

They are using LZO1X as the other layer of compression.

Could you provide some more detail? How did you determine lzo1x? I tried lzo1x_decompress from minilzo and couldn't make it work. At which offset does the lzo compressed block start (I assume at least first 4 bytes to be a header)?

mix wrote:Could you provide some more detail? How did you determine lzo1x? I tried lzo1x_decompress from minilzo and couldn't make it work. At which offset does the lzo compressed block start (I assume at least first 4 bytes to be a header)?

Data seems to start at offset 0x04, I will try later today.
Seems like it is some other kind of LZ variant.

So any ideas a about the compression type?