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Create gcmtool.py
Tool for unpack and pack GCM/ISO files. This tool don't save random bytes written in non-mapped DVD intervals that's why the resulting ISO file will be different from initial ISO
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tmpz23
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gcmtool.py
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214
gcmtool.py
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#!/usr/bin/env python3
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from pathlib import Path
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__version__ = "0.0.1"
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__author__ = "rigodron, algoflash, GGLinnk"
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__license__ = "MIT"
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__status__ = "developpement"
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DVD_MAGIC = b"\xC2\x33\x9F\x3D"
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FST_TYPE_FILE = 0
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FST_TYPE_DIR = 1
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######################################################################
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# Todo : add logging ; add extension check ; add --verbose ; add --disable-ignore
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# -> test it on random iso and check that it's the same than dolphin extract
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# -> test it !!!!
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# Add FST rebuild ;
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# add info on unused randoms bytes on initial DVD iso file
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# -> that's why repack iso is different from initial iso
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######################################################################
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class Dol:
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# Get total length using the sum of the 18 sections length and dol header length (0x100)
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def getDolLen(self, dolheader_data:bytes):
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dol_len = 0x100
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for i in range(18):
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dol_len += int.from_bytes(dolheader_data[0x90+i*4:0x90+(i+1)*4], "big", signed=False)
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return dol_len
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# https://sudonull.com/post/68549-Gamecube-file-system-device
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class GCM:
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def unpack(self, iso_path:Path):
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with iso_path.open("rb") as iso_file:
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bootbin_data = iso_file.read(0x440)
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if bootbin_data[0x1c:0x20] != DVD_MAGIC:
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raise Exception("Invalid DVD format - this tool is for ISO/GCM files")
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bi2bin_data = iso_file.read(0x2000)
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# https://www.gc-forever.com/wiki/index.php?title=Apploader
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# -> Full apploader size is sum of size and trailerSize, rounded up to 32 bytes.
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iso_file.seek(0x2454)
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size = int.from_bytes(iso_file.read(4), "big", signed=False)
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trailerSize = int.from_bytes(iso_file.read(4), "big", signed=False)
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# Dolphin Emulator add 32 Null bytes at the end of the extracted apploader.img
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apploader_size = size + trailerSize + 32
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iso_file.seek(0x2440)
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apploaderimg_data = iso_file.read(apploader_size)
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print( 0x2440 + apploader_size )
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print("fst.bin :", int.from_bytes(bootbin_data[0x424:0x428],"big", signed=False), int.from_bytes(bootbin_data[0x428:0x42c],"big", signed=False))
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iso_file.seek( int.from_bytes(bootbin_data[0x424:0x428],"big", signed=False) )
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fstbin_data = iso_file.read( int.from_bytes(bootbin_data[0x428:0x42c],"big", signed=False) )
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dol_offset = int.from_bytes(bootbin_data[0x420:0x424],"big", signed=False)
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iso_file.seek( dol_offset )
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dol = Dol()
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dolheader_data = iso_file.read(0x100)
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bootdol_data = dolheader_data + iso_file.read( dol.getDolLen( dolheader_data ) - 0x100 )
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print("dol :", dol_offset, dol.getDolLen( dolheader_data ))
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base_path = Path(f"{bootbin_data[:4].decode('utf-8')}-{int.from_bytes(bootbin_data[6:7], 'little', signed=False):02}")
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sys_path = base_path / "sys"
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sys_path.mkdir(parents=True, exist_ok=True)
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with (sys_path / "boot.bin").open("wb") as bootbin_file, \
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(sys_path / "bi2.bin" ).open("wb") as bi2bin_file, \
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(sys_path / "fst.bin").open("wb") as fstbin_file, \
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(sys_path / "apploader.img").open("wb") as apploaderimg_file,\
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(sys_path / "boot.dol").open("wb") as bootdol_file :
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bootbin_file.write(bootbin_data)
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bi2bin_file.write(bi2bin_data)
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fstbin_file.write(fstbin_data)
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apploaderimg_file.write(apploaderimg_data)
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bootdol_file.write(bootdol_data)
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root_path = base_path / "root"
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root_path.mkdir(exist_ok=True)
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# And now we parse FST data to unpack all files in the GCM iso file
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dir_index_path = {0: root_path}
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currentdir_path = root_path
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# root: index=0 so nextdir is the end
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nextdir = int.from_bytes(fstbin_data[8:12], "big", signed=False)
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# offset of filenames block
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base_names = nextdir * 12
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# go to parent when index reach next dir
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nextdir_arr = [ nextdir ]
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for index in range(1, base_names // 12):
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i = index * 12
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file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False)
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name = fstbin_data[base_names + int.from_bytes(fstbin_data[i+1:i+4], "big", signed=False):].split(b"\x00")[0].decode("utf-8")
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while index == nextdir_arr[-1]:
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currentdir_path = currentdir_path.parent
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nextdir_arr.pop()
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if file_type == FST_TYPE_DIR:
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nextdir = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
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parentdir = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
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nextdir_arr.append( nextdir )
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currentdir_path = dir_index_path[parentdir] / name
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dir_index_path[index] = currentdir_path
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currentdir_path.mkdir(exist_ok=True)
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else:
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fileoffset = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
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filesize = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
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with (currentdir_path / name).open("wb") as new_file:
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iso_file.seek(fileoffset)
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new_file.write( iso_file.read(filesize) )
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print("file :", fileoffset, filesize)
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def pack(self, folder_path:Path, iso_path:Path = None):
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if iso_path == None:
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iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso")
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with iso_path.open("wb") as iso_file, \
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(folder_path / "sys" / "boot.bin").open("rb") as bootbin_file, \
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(folder_path / "sys" / "bi2.bin" ).open("rb") as bi2bin_file, \
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(folder_path / "sys" / "fst.bin").open("rb") as fstbin_file, \
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(folder_path / "sys" / "apploader.img").open("rb") as apploaderimg_file,\
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(folder_path / "sys" / "boot.dol").open("rb") as bootdol_file :
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bootbin_data = bootbin_file.read()
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iso_file.write( bootbin_data )
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iso_file.write(bi2bin_file.read())
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iso_file.write(apploaderimg_file.read())
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fstbin_offset = int.from_bytes(bootbin_data[0x424:0x428],"big", signed=False)
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fstbin_len = int.from_bytes(bootbin_data[0x428:0x42c],"big", signed=False)
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if (folder_path / "sys" / "fst.bin").stat().st_size != fstbin_len:
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raise Exception("Invalid fst.bin size in boot.bin offset 0x428:0x42c!")
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iso_file.seek( fstbin_offset )
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fstbin_data = fstbin_file.read()
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iso_file.write( fstbin_data )
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dol_offset = int.from_bytes(bootbin_data[0x420:0x424],"big", signed=False)
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iso_file.seek( dol_offset )
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iso_file.write( bootdol_file.read() )
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# Now parse fst.bin for writing files in the iso
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dir_index_path = {0: folder_path / "root"}
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currentdir_path = folder_path / "root"
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# root: index=0 so nextdir is the end
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nextdir = int.from_bytes(fstbin_data[8:12], "big", signed=False)
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# offset of filenames block
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base_names = nextdir * 12
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# go to parent when index reach next dir
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nextdir_arr = [ nextdir ]
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for index in range(1, base_names // 12):
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i = index * 12
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file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False)
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name = fstbin_data[base_names + int.from_bytes(fstbin_data[i+1:i+4], "big", signed=False):].split(b"\x00")[0].decode("utf-8")
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while index == nextdir_arr[-1]:
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currentdir_path = currentdir_path.parent
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nextdir_arr.pop()
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if file_type == FST_TYPE_DIR:
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nextdir = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
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parentdir = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
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nextdir_arr.append( nextdir )
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currentdir_path = dir_index_path[parentdir] / name
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dir_index_path[index] = currentdir_path
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currentdir_path.mkdir(exist_ok=True)
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else:
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fileoffset = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
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filesize = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
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print(fileoffset, filesize)
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with (currentdir_path / name).open("rb") as new_file:
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iso_file.seek(fileoffset)
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iso_file.write( new_file.read(filesize) )
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def get_argparser():
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import argparse
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parser = argparse.ArgumentParser(description='ISO/GCM packer & unpacker - [GameCube] v' + __version__)
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parser.add_argument('--version', action='version', version='%(prog)s ' + __version__)
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parser.add_argument('input_path', metavar='INPUT', help='')
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parser.add_argument('output_path', metavar='OUTPUT', help='', nargs='?', default="")
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group = parser.add_mutually_exclusive_group(required=True)
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group.add_argument('-p', '--pack', action='store_true', help="-p source_folder (dest_file.iso) : Pack source_folder in new file source_folder.iso or dest_file.iso if specified")
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group.add_argument('-u', '--unpack', action='store_true', help='-u source_iso.iso (dest_folder) : Unpack the GCM/ISO in new folder source_iso or dest_folder if specified')
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return parser
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if __name__ == '__main__':
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args = get_argparser().parse_args()
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p_input = Path(args.input_path)
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p_output = Path(args.output_path)
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gcm = GCM()
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if args.pack:
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logging.info("### Pack")
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if(p_output == Path(".")):
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p_output = Path(p_input.with_suffix(".iso"))
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gcm.pack( p_input, p_output )
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elif args.unpack:
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logging.info("### Unpack")
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if(p_output == Path(".")):
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p_output = Path(p_input.name)
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gcm.unpack( p_input, p_output )
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