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37 lines
1.9 KiB
Markdown
37 lines
1.9 KiB
Markdown
# gcmtool.py
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Python3 script for unpack/pack/rebuild GCM/iso file format. This tool can rebuild FileStringTable (FST) of GCM and patch boot.bin with a new apploader.img, boot.dol, add/remove/edit folder and files of the game. MIT License.
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## User manual
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Unpack GCM/iso file **source_gcm.iso** in the default new folder _game_code-DVD_number_. If optional_dest_folder is specified we unpack in _optional_dest_folder_.
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```
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gcmtool.py --unpack source_gcm.iso optional_dest_folder
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```
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Pack **source_folder** in the default new GCM/iso file _source_folder.iso_. If optional_dest_file.iso is specified we pack in _optional_dest_file.iso_. If one of the files or system files contains length change we have to use --rebuild-fst command before packing.
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```
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gcmtool.py --pack source_folder optional_dest_file.iso
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```
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Rebuild the FST file system of an unpacked GCM/iso and patch boot.bin for a new apploader, dol, and add/remove/edit of folders and files.
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```
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gcmtool.py --rebuild-fst source_folder
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```
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Print stats about the GCM/iso file or the unpacked GCM/iso folder. This stats contains informations about full memory mapping sorted by offset (files and system files), get empty spaces informations using optional align -a (default=4).
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```
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gcmtool.py --stats path -a 4
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```
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Japanese charset is not handled for now except if you have installed Japanese local.
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The original GCM/iso and repack GCM/iso are different most of the time. This is because GCM DVD contains "empty spaces" with data unused (old datas or random datas I don't know). So this datas are useless and loss during unpack.
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The sorting of files during FST rebuild is deferent from the original and this is full compatible with the GameCube dol API.
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## Extracted file tree
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root folder contains all files of the unpacked GCM/iso
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sys folder contains GCM system files of the game:
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* boot.bin
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* bi2.bin
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* apploader.img
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* boot.dol
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* fst.bin
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