Thank you @bodgit ! Great work! I'll test it out.

I cheated on that MAME file, in my program I'm using a specific version, so I get the archive offset by running 7z test:

[8:09:54] 0:_experiments/tetris/1 (runner)> 7z t mame0253b_64bit.exe 

7-Zip [64] 17.05 : Copyright (c) 1999-2021 Igor Pavlov : 2017-08-28
p7zip Version 17.05 (locale=utf8,Utf16=on,HugeFiles=on,64 bits,16 CPUs x64)

Scanning the drive for archives:
1 file, 90468973 bytes (87 MiB)

Testing archive: mame0253b_64bit.exe
--       
Path = mame0253b_64bit.exe
Type = 7z
Offset = 205824
Physical Size = 90263149
Headers Size = 21231
Method = Delta LZMA2:26 BCJ
Solid = +
Blocks = 3

Everything is Ok              

Folders: 256
Files: 2243
Size:       621080252
Compressed: 90468973

Which gives the offset, then I use this value to Seek, and open a SectionReader: https://github.com/corkscrewey/soviet-tetris/blob/runner/mame.go#L70-L74. I did think of implementing a search within the file for the 7z signature, but that would be an overkill for such a simple program that just needs to unpack it.

Thanks again!

Support BCJ method #62

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