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README.md

File metadata and controls

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gog hashdb

What is it?

GOG's hashdb is a very simple format providing checksums for each file from given product depot

goggame-GameId.hashdb

Structure

hashdb is a zip file with one entry (called the same as archive)

Header

File starts with 3, 4-byte intigers. First two are always 12 and 1

The third intiger is number of records

File record

Each record is a 1024 byte file path relative to install directory.
And 32 bytes of MD5 checksum.