This is a collection of tools for compressing and decompressing Nintendo's LZSS formats, found in games such as Pokémon. MIT licensed.

Supports: (Python 3)

• LZ10 (compression and decompression)
• LZ11 (compression and decompression)
• overlays (decompression only)

Python 2 support is less complete:

• LZ10 (decompression only)
• overlays (decompression only)

Note: Names are pretty inconsistent. I variously refer the compression algorithm as LZSS, LZSS10, LZ10 and NLZ10.

• lzss3.py - LZ decompression routines for Python 3. Can used as a module or a standalone script.
• compress.py - LZ compression routines for Python 3. Should be merged into lzss3.py. Command-line interface is spotty.
• verify.py - Script i threw together while trying to debug LZ11 compression. Should be merged into lzss3.py. Python 3.
• lzss.py - Incomplete LZ decompression routines for Python 2. Only supports LZ10.
• armdecomp.py - Command-line tool for decompressing overlays or arm9.bin. Python 2 version.
• armdecomp3.py - Command-line tool for decompressing overlays or arm9.bin. Python 3 version. About twice as fast as the Python 2 version. The code has already been merged into lzss3.py, so this file isn't really needed.
• test_lzss3.py - Tests for lzss3.py and compress.py.