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Update gcmtool.py

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using unique align function to be sure to align every offset of files in the iso
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tmpz23 2022-01-11 14:19:31 +01:00 committed by GitHub
parent 82c1d69c65
commit 1a21bf6f5e
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1 changed files with 16 additions and 17 deletions
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gcmtool.py
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@ -3,7 +3,7 @@ from pathlib import Path
import logging
__version__ = "0.0.5"
__version__ = "0.0.6"
__author__ = "rigodron, algoflash, GGLinnk"
__license__ = "MIT"
__status__ = "developpement"
@ -28,6 +28,12 @@ ISO_APPLOADERSIZE_OFFSET = 0x2454
# add info on unused randoms bytes on initial DVD iso file
# -> that's why repack iso is different from initial iso
######################################################################
def align(offset:int, align:int):
if offset % align != 0:
offset += align - (offset % align)
return align
class Node:
__id = None
__type = None
@ -112,10 +118,7 @@ class FstTree:
# Needed to know where we can begin to write files
def __get_fst_length(self):
self.__generate_nameblock_length()
fst_len = self.__count_childs(self.__root_node)*12 + 12 + self.__nameblock_length
if fst_len % self.__align != 0:
fst_len += self.__align - (fst_len % self.__align)
return fst_len
return align(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
@ -157,9 +160,7 @@ class FstTree:
else:
node.set_offset(self.__current_file_offset)
self.__fst_block += node.format()
self.__current_file_offset += node.size()
if self.__current_file_offset % self.__align != 0:
self.__current_file_offset += self.__align - (self.__current_file_offset % self.__align)
self.__current_file_offset = align(self.__current_file_offset + node.size(), self.__align)
def get_fst(self):
self.__current_file_offset += self.__get_fst_length()
self.__prepare()
@ -352,16 +353,12 @@ class GCM:
root_path = folder_path / "root"
sys_path = folder_path / "sys"
with (sys_path / "boot.bin").open("rb+") as bootbin_file:
dol_offset = ISO_APPLOADER_OFFSET + (sys_path / "apploader.img").stat().st_size
if dol_offset % align != 0:
dol_offset += align - (dol_offset % align)
dol_offset = align(ISO_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_file.seek(BOOTBIN_DOLOFFSET_OFFSET)
bootbin_file.write(dol_offset.to_bytes(4, "big"))
fst_offset = dol_offset + (sys_path / "boot.dol").stat().st_size
if fst_offset % align != 0:
fst_offset += align - (fst_offset % align)
fst_offset = align(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_file.seek(BOOTBIN_FSTOFFSET_OFFSET)
bootbin_file.write(fst_offset.to_bytes(4, "big"))
@ -373,10 +370,12 @@ class GCM:
for path in path_list:
fst_tree.add_node_by_path(path)
logging.debug(fst_tree)
fst_path = sys_path / "fst.bin"
with fst_path.open("wb") as fstbin_file:
logging.info("Writing fst in sys/fst.bin")
fstbin_file.write( 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_file.seek(BOOTBIN_FSTLEN_OFFSET)
@ -411,16 +410,16 @@ if __name__ == '__main__':
logging.getLogger().setLevel(logging.DEBUG)
if args.pack:
logging.info("### 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")
logging.info("### Unpack GCM iso in new folder")
gcm.unpack( p_input, p_output )
elif args.rebuild_fst:
logging.info("### Rebuilding 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}")