t3gbLz.
LZSS compression tool for 'Teenage Mutant Ninja Turtles III - Radical Rescue (U)' game
Synopsis:
t3gbLz [-d | -c] inFileName outFileName
Description:
t3gbLz -d <inFile> <offset> <outSize> <outFile> - Decompress block from given ROM file.
t3gbLz -c <inFile> <outFile> - Compress given plain block.
-h - Display help
-v - Output version information
See additional files in release archive.
Compression scheme is used at least for 2bpp tiles and nametables. Nothing special, just LZSS with some quirks in serialization scheme:
8 LZ entries are prefixed by flags byte.
1 - literal copy;
0 - LZ pair: ZZZZZZZZ ?XXYYYYY where
XXZZZZZZZZ - lzDistance.
Unexplainable: buffer ring starts from 3DE and wraps to 0 at 400.
In absolute address: D700-DAFF
YYYYY - lzLength -3
Build with Haskell Stack tool.