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NeoGF/gcmtool.py
tmpz23 012fbb5195
Update gcmtool.py
2022-01-16 18:00:02 +01:00

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#!/usr/bin/env python3
from pathlib import Path
import logging
__version__ = "0.0.9"
__author__ = "rigodron, algoflash, GGLinnk"
__license__ = "MIT"
__status__ = "developpement"
def align_offset(offset:int, align:int):
if offset % align != 0:
offset += align - (offset % align)
return offset
class Fst:
TYPE_FILE = 0
TYPE_DIR = 1
class Node:
__id = None
__name = None
__name_offset = None
def __init__(self, name:str):
self.__name = name
def id(self): return self.__id
def name(self): return self.__name
def name_offset(self): return self.__name_offset
def set_id(self, id:int): self.__id = id
def set_name_offset(self, name_offset:int): self.__name_offset = name_offset
class File(Node):
__type = Fst.TYPE_FILE
__size = None
__offset = None
def __init__(self, name:str, size:int):
super().__init__(name)
self.__size = size
def __str__(self):
return f"{self.id()};{self.name()};{self.size()};{self.offset()};{self.name_offset()}"
def type(self): return self.__type
def size(self): return self.__size
def offset(self): return self.__offset
def set_offset(self, offset:int): self.__offset = offset
def format(self):
return self.type().to_bytes(1, "big") + self.name_offset().to_bytes(3, "big") + self.offset().to_bytes(4, "big") + self.size().to_bytes(4, "big")
class Folder(Node):
__type = Fst.TYPE_DIR
__parent = None
__next_dir = None
__childs = None
def __init__(self, name:str, parent:Node):
super().__init__(name)
self.__parent = parent
self.__childs = []
def __str__(self):
return f"{self.id()};{self.name()};{self.next_dir()};{self.name_offset()}"
def type(self): return self.__type
def parent(self): return self.__parent
def next_dir(self): return self.__next_dir
def childs(self): return self.__childs
def set_next_dir(self, next_dir): self.__next_dir = next_dir
# Search child by name an return existing if found or new if not existing
def add_child(self, node:Node):
for child in self.__childs:
if node.name() == child.name():
return child
self.__childs.append(node)
return node
def format(self):
return self.type().to_bytes(1, "big") + self.name_offset().to_bytes(3, "big") + self.parent().id().to_bytes(4, "big") + self.next_dir().to_bytes(4, "big")
class FstTree(Fst):
__root_path_length = None
__root_node = None
__current_id = 0
__current_file_offset = None
__align = None
__fst_block = None
__name_block = None
__nameblock_length = None # Used to find min file_offset when fst is at the end of the iso beginning
def __init__(self, root_path:Path, fst_offset:int, align:int = 4):
self.__root_path_length = len(root_path.parts)
self.__root_node = Folder(root_path.name, None)
self.__align = align
self.__name_block = b""
self.__fst_block = b""
self.__nameblock_length = 0
self.__current_file_offset = fst_offset
def __str__(self):
return self.__to_str(self.__root_node)
def __to_str(self, node:Node, depth=0):
result = (depth * " ") + str(node) +"\n"
if node.type() == FstTree.TYPE_DIR:
for child in node.childs():
result += self.__to_str(child, depth+1)
return result
# Needed to know where we can begin to write files
def __get_fst_length(self):
self.__generate_nameblock_length()
return align_offset(self.__count_childs(self.__root_node)*12 + 12 + self.__nameblock_length, self.__align)
def __generate_nameblock_length(self, node:Node = None):
if node == None:
node = self.__root_node
else:
self.__nameblock_length += len(node.name()) + 1
if node.type() == FstTree.TYPE_DIR:
for child in node.childs():
self.__generate_nameblock_length(child)
def __prepare(self, node:Node = None):
name_offset = 0
if node == None:
node = self.__root_node
else:
name_offset = len(self.__name_block)
self.__name_block += node.name().encode("utf-8")+b"\x00"
node.set_name_offset(name_offset)
node.set_id(self.__current_id)
self.__current_id += 1
if node.type() == FstTree.TYPE_DIR:
node.set_next_dir(self.__current_id + self.__count_childs(node))
if node == self.__root_node:
self.__fst_block = b"\x01\x00\x00\x00\x00\x00\x00\x00" + node.next_dir().to_bytes(4, "big")
else:
self.__fst_block += node.format()
for child in node.childs():
self.__prepare(child)
else:
node.set_offset(self.__current_file_offset)
self.__fst_block += node.format()
self.__current_file_offset = align_offset(self.__current_file_offset + node.size(), self.__align)
def __count_childs(self, node:Folder):
count = 0
for child in node.childs():
if child.type() == FstTree.TYPE_DIR:
count += self.__count_childs(child)
return count + len(node.childs())
def add_node_by_path(self, node_path:Path):
parent = self.__root_node
node = None
for i in range(self.__root_path_length, len(node_path.parts)-1):
node = Folder(node_path.parts[i], parent)
parent = parent.add_child(node)
if node_path.is_file():
node = File(node_path.name, node_path.stat().st_size)
else:
node = Folder(node_path.name, parent)
parent.add_child(node)
def get_fst(self):
self.__current_file_offset += self.__get_fst_length()
self.__prepare()
return self.__fst_block + self.__name_block
class BootBin:
LEN = 0x440
DOLOFFSET_OFFSET = 0x420
FSTOFFSET_OFFSET = 0x424
FSTLEN_OFFSET = 0x428
MAXFSTLEN_OFFSET = 0x42c
__data = None
def __init__(self, data:bytes):
self.__data = bytearray(data)
def data(self): return self.__data
def dvd_magic(self):
return self.__data[0x1c:0x20]
def fstbin_offset(self):
return int.from_bytes(self.__data[BootBin.FSTOFFSET_OFFSET:BootBin.FSTOFFSET_OFFSET+4],"big", signed=False)
def fstbin_len(self):
return int.from_bytes(self.__data[BootBin.FSTLEN_OFFSET:BootBin.FSTLEN_OFFSET+4],"big", signed=False)
def dol_offset(self):
return int.from_bytes(self.__data[BootBin.DOLOFFSET_OFFSET:BootBin.DOLOFFSET_OFFSET+4],"big", signed=False)
def game_code(self):
return self.__data[:4].decode('utf-8')
def disc_number(self):
return int.from_bytes(self.__data[6:7], 'big', signed=False)
def set_dol_offset(self, offset:int):
self.__data[BootBin.DOLOFFSET_OFFSET:BootBin.DOLOFFSET_OFFSET+4] = offset.to_bytes(4, "big")
def set_fst_offset(self, offset:int):
self.__data[BootBin.FSTOFFSET_OFFSET:BootBin.FSTOFFSET_OFFSET+4] = offset.to_bytes(4, "big")
def set_fst_len(self, size:int):
self.__data[BootBin.FSTLEN_OFFSET:BootBin.FSTLEN_OFFSET+4] = size.to_bytes(4, "big")
def set_max_fst_len(self, size:int):
self.__data[BootBin.MAXFSTLEN_OFFSET:BootBin.MAXFSTLEN_OFFSET+4] = size.to_bytes(4, "big")
class Dol:
HEADER_LEN = 0x100
HEADER_SECTIONLENTABLE_OFFSET = 0x90
# Get total length using the sum of the 18 sections length and dol header length
def get_dol_len(self, dolheader_data:bytes):
dol_len = Dol.HEADER_LEN
for i in range(18):
dol_len += int.from_bytes(dolheader_data[Dol.HEADER_SECTIONLENTABLE_OFFSET+i*4:Dol.HEADER_SECTIONLENTABLE_OFFSET+(i+1)*4], "big", signed=False)
return dol_len
# https://sudonull.com/post/68549-Gamecube-file-system-device
class Gcm:
BI2BIN_LEN = 0x2000
APPLOADER_HEADER_LEN = 0x20
APPLOADER_OFFSET = 0x2440
APPLOADERSIZE_OFFSET = 0x2454
DVD_MAGIC = b"\xC2\x33\x9F\x3D"
def unpack(self, iso_path:Path, folder_path:Path):
with iso_path.open("rb") as iso_file:
bootbin = BootBin(iso_file.read(BootBin.LEN))
if bootbin.dvd_magic() != Gcm.DVD_MAGIC:
raise Exception("Invalid DVD format - this tool is for ISO/GCM files")
bi2bin_data = iso_file.read(Gcm.BI2BIN_LEN)
iso_file.seek(Gcm.APPLOADERSIZE_OFFSET)
size = int.from_bytes(iso_file.read(4), "big", signed=False)
trailerSize = int.from_bytes(iso_file.read(4), "big", signed=False)
apploader_size = Gcm.APPLOADER_HEADER_LEN + size + trailerSize
iso_file.seek(Gcm.APPLOADER_OFFSET)
apploaderimg_data = iso_file.read(apploader_size)
fstbin_offset = bootbin.fstbin_offset()
fstbin_len = bootbin.fstbin_len()
iso_file.seek( fstbin_offset )
fstbin_data = iso_file.read( fstbin_len )
dol_offset = bootbin.dol_offset()
iso_file.seek( dol_offset )
dol = Dol()
dolheader_data = iso_file.read(Dol.HEADER_LEN)
dol_len = dol.get_dol_len( dolheader_data )
bootdol_data = dolheader_data + iso_file.read( dol_len - Dol.HEADER_LEN )
if folder_path != Path("."):
base_path = folder_path
else:
base_path = Path(f"{bootbin.game_code()}-{bootbin.disc_number():02}")
logging.info(f"unpacking \"{iso_path}\" in \"{base_path}\"")
sys_path = base_path / "sys"
sys_path.mkdir(parents=True, exist_ok=True)
logging.debug(f"{iso_path}(0x0:0x{BootBin.LEN:x}) -> {sys_path / 'boot.bin'}")
(sys_path / "boot.bin").write_bytes(bootbin.data())
logging.debug(f"{iso_path}(0x440:0x{Gcm.APPLOADER_OFFSET:x}) -> {sys_path / 'bi2.bin'}")
(sys_path / "bi2.bin" ).write_bytes(bi2bin_data)
logging.debug(f"{iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + apploader_size:x} -> {sys_path / 'apploader.img'}")
(sys_path / "apploader.img").write_bytes(apploaderimg_data)
logging.debug(f"{iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x}) -> {sys_path / 'fst.bin'}")
(sys_path / "fst.bin").write_bytes(fstbin_data)
logging.debug(f"{iso_path}(0x{dol_offset:x}:0x{dol_offset + dol_len:x}) -> {sys_path / 'boot.dol'}")
(sys_path / "boot.dol").write_bytes(bootdol_data)
root_path = base_path / "root"
root_path.mkdir(exist_ok=True)
# And now we parse FST data to unpack all files in the GCM iso file
dir_id_path = {0: root_path}
currentdir_path = root_path
# root: id=0 so nextdir is the end
nextdir = int.from_bytes(fstbin_data[8:12], "big", signed=False)
# offset of filenames block
base_names = nextdir * 12
# go to parent when id reach next dir
nextdir_arr = [ nextdir ]
for id in range(1, base_names // 12):
i = id * 12
file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False)
name = fstbin_data[base_names + int.from_bytes(fstbin_data[i+1:i+4], "big", signed=False):].split(b"\x00")[0].decode("utf-8")
while id == nextdir_arr[-1]:
currentdir_path = currentdir_path.parent
nextdir_arr.pop()
if file_type == FstTree.TYPE_DIR:
nextdir = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
parentdir = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
nextdir_arr.append( nextdir )
currentdir_path = dir_id_path[parentdir] / name
dir_id_path[id] = currentdir_path
currentdir_path.mkdir(exist_ok=True)
else:
fileoffset = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
filesize = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
iso_file.seek(fileoffset)
(currentdir_path / name).write_bytes( iso_file.read(filesize) )
logging.debug(f"{iso_path}(0x{fileoffset:x}:0x{fileoffset + filesize:x}) -> {currentdir_path / name}")
def pack(self, folder_path:Path, iso_path:Path = None):
if iso_path == None:
iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso")
with iso_path.open("wb") as iso_file:
logging.debug(f"{folder_path / 'sys' / 'boot.bin'} -> {iso_path}(0x0:0x{BootBin.LEN:x})")
logging.debug(f"{folder_path / 'sys' / 'bi2.bin'} -> {iso_path}(0x{BootBin.LEN:x}:0x{Gcm.APPLOADER_OFFSET:x})")
logging.debug(f"{folder_path / 'sys' / 'apploader.img'} -> {iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + (folder_path / 'sys' / 'apploader.img').stat().st_size:x}")
bootbin = BootBin((folder_path / "sys" / "boot.bin").read_bytes())
iso_file.write(bootbin.data())
iso_file.write((folder_path / "sys" / "bi2.bin").read_bytes())
iso_file.write((folder_path / "sys" / "apploader.img").read_bytes())
fstbin_offset = bootbin.fstbin_offset()
fstbin_len = bootbin.fstbin_len()
if (folder_path / "sys" / "fst.bin").stat().st_size != fstbin_len:
raise Exception(f"Invalid fst.bin size in boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x}:0x{BootBin.FSTLEN_OFFSET+4:x}!")
logging.debug(f"{folder_path / 'sys' / 'fst.bin'} -> {iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x})")
iso_file.seek( fstbin_offset )
fstbin_data = (folder_path / "sys" / "fst.bin").read_bytes()
iso_file.write( fstbin_data )
dol_offset = bootbin.dol_offset()
logging.debug(f"{folder_path / 'sys' / 'boot.dol'} -> {iso_path}(0x{dol_offset:x}:0x{dol_offset + (folder_path / 'sys' / 'boot.dol').stat().st_size:x})")
iso_file.seek( dol_offset )
iso_file.write( (folder_path / "sys" / "boot.dol").read_bytes() )
# Now parse fst.bin for writing files in the iso
dir_id_path = {0: folder_path / "root"}
currentdir_path = folder_path / "root"
# root: id=0 so nextdir is the end
nextdir = int.from_bytes(fstbin_data[8:12], "big", signed=False)
# offset of filenames block
base_names = nextdir * 12
# go to parent when id reach next dir
nextdir_arr = [ nextdir ]
for id in range(1, base_names // 12):
i = id * 12
file_type = int.from_bytes(fstbin_data[i:i+1], "big", signed=False)
name = fstbin_data[base_names + int.from_bytes(fstbin_data[i+1:i+4], "big", signed=False):].split(b"\x00")[0].decode("utf-8")
while id == nextdir_arr[-1]:
currentdir_path = currentdir_path.parent
nextdir_arr.pop()
if file_type == FstTree.TYPE_DIR:
nextdir = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
parentdir = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
nextdir_arr.append( nextdir )
currentdir_path = dir_id_path[parentdir] / name
dir_id_path[id] = currentdir_path
currentdir_path.mkdir(exist_ok=True)
else:
file_offset = int.from_bytes(fstbin_data[i+4:i+8], "big", signed=False)
file_len = int.from_bytes(fstbin_data[i+8:i+12], "big", signed=False)
if (currentdir_path / name).stat().st_size != file_len:
raise Exception(f"Invalid file size : {currentdir_path / name} - use --rebuild-fst before packing files in the iso.")
logging.debug(f"{currentdir_path / name} -> {iso_path}(0x{file_offset:x}:0x{file_offset + file_len:x})")
iso_file.seek(file_offset)
iso_file.write( (currentdir_path / name).read_bytes() )
def rebuild_fst(self, folder_path:Path, align:int):
root_path = folder_path / "root"
sys_path = folder_path / "sys"
dol_offset = align_offset(Gcm.APPLOADER_OFFSET + (sys_path / "apploader.img").stat().st_size, align)
logging.info(f"Patching sys/boot.bin offset 0x{BootBin.DOLOFFSET_OFFSET:x} with new dol offset (0x{dol_offset:x})")
bootbin = BootBin((sys_path / "boot.bin").read_bytes())
bootbin.set_dol_offset(dol_offset)
fst_offset = align_offset(dol_offset + (sys_path / "boot.dol").stat().st_size, align)
logging.info(f"Patching sys/boot.bin offset 0x{BootBin.FSTOFFSET_OFFSET:x} with new fst offset (0x{fst_offset:x})")
bootbin.set_fst_offset(fst_offset)
fst_tree = FstTree(root_path, fst_offset, align=align)
# Sorting paths approach original fst sort, but in original fst specials chars are after and not before chars
path_list = sorted([path for path in root_path.glob('**/*')], key=lambda s:Path(str(s).upper()))
for path in path_list:
fst_tree.add_node_by_path(path)
logging.debug(fst_tree)
fst_path = sys_path / "fst.bin"
logging.info("Writing fst in sys/fst.bin")
fst_path.write_bytes( fst_tree.get_fst() )
fst_size = fst_path.stat().st_size
logging.info(f"Patching sys/boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x} with new fst size (0x{fst_size:x})")
bootbin.set_fst_len(fst_size)
logging.info(f"Patching sys/boot.bin offset 0x{BootBin.MAXFSTLEN_OFFSET:x} with new max fst size (0x{fst_size:x})")
bootbin.set_max_fst_len(fst_size)
(sys_path / "boot.bin").write_bytes(bootbin.data())
def get_argparser():
import argparse
parser = argparse.ArgumentParser(description='ISO/GCM packer & unpacker - [GameCube] v' + __version__)
parser.add_argument('--version', action='version', version='%(prog)s ' + __version__)
parser.add_argument('-v', '--verbose', action='store_true', help='verbose mode')
parser.add_argument('-a', '--align', type=int, help='alignment of files in the GCM ISO 4 32000', default=4)
parser.add_argument('input_path', metavar='INPUT', help='')
parser.add_argument('output_path', metavar='OUTPUT', help='', nargs='?', default="")
group = parser.add_mutually_exclusive_group(required=True)
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")
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')
group.add_argument('-r', '--rebuild-fst', action='store_true', help='-r game_folder : Rebuild the game_folder/sys/fst.bin using files in game_folder/root')
return parser
if __name__ == '__main__':
logging.basicConfig(format='%(levelname)s:%(message)s', level=logging.INFO)
args = get_argparser().parse_args()
p_input = Path(args.input_path)
p_output = Path(args.output_path)
gcm = Gcm()
if args.verbose:
logging.getLogger().setLevel(logging.DEBUG)
if args.pack:
logging.info("### Pack in new GCM iso")
if(p_output == Path(".")):
p_output = Path(p_input.with_suffix(".iso"))
logging.info(f"packing folder \"{p_input}\" in \"{p_output}\"")
gcm.pack( p_input, p_output )
elif args.unpack:
logging.info("### Unpack GCM iso in new folder")
gcm.unpack( p_input, p_output )
elif args.rebuild_fst:
logging.info("### Rebuilding FST and patching boot.bin")
if args.align < 1:
raise Exception("Align must be > 0")
logging.info(f"Using alignment : {args.align}")
gcm.rebuild_fst(p_input, args.align)
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