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dol overflows control / std comments

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10 news custom exceptions for tests
remove the tmp folder or iso when command fail
std comments
dol overflow control:
    overflow on FST
    overflow on first file offset
This commit is contained in:
tmpz23
2022-06-12 18:58:52 +02:00
committed by GitHub
parent 09581855ff
commit 2069455756
1 changed files with 260 additions and 163 deletions
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423
gcmtool/gcmtool.py
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@@ -3,47 +3,64 @@ from pathlib import Path
import logging
__version__ = "0.1.1"
__version__ = "0.1.2"
__author__ = "rigodron, algoflash, GGLinnk"
__license__ = "MIT"
__status__ = "developpement"
#########################################################################
# FUNCTION: align_offset
# IN: Offset to align (file offset to place inside the iso for instance)
# IN: align wich could change with some GCM
# OUT: upper rouded offset aligned using the align value
# DESCRIPTION Give the upper rounded offset by the align value
#########################################################################
# raised when the boot.bin DVD magic number is invalid
class InvalidDVDMagicError(Exception): pass
# raised when unpack folder already exist to avoid erasing already existing files
class InvalidUnpackFolderError(Exception): pass
# raised when pack iso already exist to avoid erasing already existing file
class InvalidPackIsoError(Exception): pass
# raised during pack when fst.bin size doesn't match the boot.bin value
class InvalidFSTSizeError(Exception): pass
# raised during pack when boot.dol size overflow on first file or on FST
class DolSizeOverflowError(Exception): pass
# raised during pack when FST folder entry has an invalid nextdir id value; this happen when file and folder has been added/removed
class InvalidRootFileFolderCountError(Exception): pass
# raised during pack when FST file entry has a different value than the file being packed; this happen when a file has been edited changing it's size
class InvalidFSTFileSizeError(Exception): pass
# raised during pack when FST dir name is not found in the root folder; this happen when a dir is renamed or removed
class FSTDirNotFoundError(Exception): pass
# raised during pack when FST file name is not found in the root folder; this happen when a file is renamed or removed
class FSTFileNotFoundError(Exception): pass
# raised during the stats command when align make file offsets collisions (this happen when given align > real files align); or when using an invalid align
class BadAlignError(Exception): pass
def align_offset(offset:int, align:int):
"""
Give the upper rounded offset aligned using the align value.
input: offset = int
input: align = int
return offset = int
"""
if offset % align != 0:
offset += align - (offset % align)
return offset
#########################################################################
# class: Fst
# DESCRIPTION This could be changed te be an Enum FlagInt
#########################################################################
class Fst:
"Pack FST type enum values."
TYPE_FILE = 0
TYPE_DIR = 1
#########################################################################
# Interface: Node
# Constructor: name of the file or folder
# DESCRIPTION Used to be herited by File and Folder classes
# It groups common properties and allow an FST rebuid:
# FST use a base_name block and name offsets relative to it for
# all entries: Files or Folders. So we handle name in this interface.
# name offset will be set during the FstTree.__prepare() aftet all
# of the three elements are added.
# Also every File and Folder get an ID. This ID is important when
# rebuilding the FST with folders (next dir, parent dir) ...
#########################################################################
class Node:
"""
Interface Node used to be herited by File and Folder classes.
It groups common properties and allow an FST rebuid:
FST use a base_name block and name offsets relative to it for all
entries: Files or Folders. So we handle name in this interface.
name offset will be set during the FstTree.__prepare() after all
of the three elements are added.
Also every File and Folder get an ID. This ID is important when
rebuilding the FST with folders (next dir, parent dir) ...
Constructor: name = str (file or folder)
"""
__id = None
__name = None
__name_offset = None
@@ -56,14 +73,15 @@ class Node:
def set_name_offset(self, name_offset:int): self.__name_offset = name_offset
#########################################################################
# class: File
# Constructor: name of the file and size
# DESCRIPTION Use a global class attribute TYPE_FILE and store necessary
# informations format it's FST 12 bytes entry
# This properties are type/name_offset/gcm offset/size
#########################################################################
class File(Node):
"""
Use a global class attribute TYPE_FILE and store necessary
informations for formating the FST 12 bytes entry with the
format "type/name_offset/gcm_offset/size"
Constructor:
* name = str
* size = int
"""
__type = Fst.TYPE_FILE
__size = None
__offset = None
@@ -80,15 +98,17 @@ class File(Node):
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
# Constructor: name of the file and parent
# DESCRIPTION Use a global class attribute TYPE_DIR and store necessary
# informations to format it's FST 12 bytes entry
# this class is intended to hold the tree with multiple childs
# and one parent only. The next dir is the total number of childs + 1
#########################################################################
class Folder(Node):
"""
Use a global class attribute TYPE_DIR and store necessary
informations for formating the FST 12 bytes entry with the
format "type/name_offset/parent_id/next_id". This class is
intended to hold the tree with multiple childs and one parent
only. The next dir is the total number of childs + 1
Constructor:
* name = str
* parent = Node
"""
__type = Fst.TYPE_DIR
__parent = None
__next_dir = None
@@ -104,8 +124,8 @@ class Folder(Node):
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):
"Search child by name an return existing if found or new if not existing"
for child in self.__childs:
if node.name() == child.name():
return child
@@ -115,16 +135,16 @@ class Folder(Node):
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
# Constructor: root_path (the part with folder that are out of the tree)
# fst_offset (to know where is the current min offset before
# adding the fst and name_block length)
# align (It could change in some GCM)
# DESCRIPTION FstTree is responsible for creating and formating the FST and name_block
# We store a root Node that is a special Folder
#########################################################################
class FstTree(Fst):
"""
FstTree is responsible for creating and formating the FST and name_block.
We store a root Node that is a special Folder.
Constructor:
* root_path = Path (the part with folder that are out of the tree)
* fst_offset = int (to know where is the current min offset before
adding the fst and name_block length)
* align = int (It could change in some GCM)
"""
# When we walk recursivly in a path we don't wan't to add theirs out parents so it allow to stop at the folder we choose as root
__root_path_length = None
__root_node = None
@@ -138,7 +158,7 @@ class FstTree(Fst):
# Used to find min file_offset when fst is at the end of the iso beginning (otherweise we can't know the first available offset)
__nameblock_length = None
def __init__(self, root_path:Path, fst_offset:int, align:int = 4):
# as said before we don't want to add parents folder that don't are used in the folder we are packing
# as said before we don't want to add parents folder that don't are used in the folder we are packing.
self.__root_path_length = len(root_path.parts)
self.__root_node = Folder(root_path.name, None)
self.__align = align
@@ -148,19 +168,29 @@ class FstTree(Fst):
self.__current_file_offset = fst_offset
def __str__(self):
return self.__to_str(self.__root_node)
# Recursive Tree printing for debug
def __to_str(self, node:Node, depth=0):
"""
Recursive Tree str buffer for debug.
input: Node (to print childs)
return tree = str
"""
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):
"""
Needed to know where we can begin to write files.
return fst_length = int
"""
self.__generate_nameblock_length()
return align_offset(self.__count_childs(self.__root_node)*12 + 12 + self.__nameblock_length, self.__align)
# Recursive walk into the tree to get total name_block length
def __generate_nameblock_length(self, node:Node = None):
"""
Recursive walk into the tree to get total name_block length.
input: None (then it will use node:Node to recurse)
"""
if node is None:
node = self.__root_node
else:
@@ -168,9 +198,11 @@ class FstTree(Fst):
if node.type() == FstTree.TYPE_DIR:
for child in node.childs():
self.__generate_nameblock_length(child)
# We populate recursivly every Nodes with required informations for formating and
# generate the name_block and fst_block
def __prepare(self, node:Node = None):
"""
Populate recursivly every Nodes with required informations for formating and generate the name_block and fst_block.
input: None (then it will use node:Node to recurse)
"""
name_offset = 0
# For root Node we build the nameblock with null trailing byte
# For others we build the name_block and update the name_offset
@@ -200,15 +232,27 @@ class FstTree(Fst):
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):
"""
Recursivly count total childs of a Node. It is usefull for getting next_dir id.
input: node = Folder
return child_count = int
"""
count = 0
for child in node.childs():
if child.type() == FstTree.TYPE_DIR:
count += self.__count_childs(child)
return count + len(node.childs())
# Add a path with each folder as Folder class and the File as a leave
# We take care to set parent and childs for folder also necessary informations
# name / size ...
def add_node_by_path(self, node_path:Path):
"""
Add a path with each folder as Folder class and the File as a leaf.
We take care to set parent and childs for folder and retrieve necessary
informations:
* name
* size
* parent id & parent->child
input:
* path = Path (folder / file)
"""
parent = self.__root_node
node = None
for i in range(self.__root_path_length, len(node_path.parts)-1):
@@ -219,23 +263,25 @@ class FstTree(Fst):
else:
node = Folder(node_path.name, parent)
parent.add_child(node)
# We generate the FST
# the hard part Here is that we have to know the result before
# knowing where we can begin to add files
def generate_fst(self):
"""
Generate the FST.
The hard part Here is that we have to know the result before
knowing where we can begin to add files
"""
self.__current_file_offset += self.__get_fst_length()
self.__prepare()
return self.__fst_block + self.__name_block
#########################################################################
# class: BootBin
# Constructor: datas (bytes or bytearray id edit is needed) of the boot.bin
# DESCRIPTION BootBin group all operations related to the boot.bin system file
# using this class avoid errors and it's easier elsewhere
# this groupment add meaning to hex values but we can also patch it
#########################################################################
class BootBin:
"""
BootBin group all operations related to the boot.bin system file
using this class avoid errors and it's easier to use it elsewhere
this groupment add meaning to hex values but we can also patch it.
Constructor:
* datas = bytes or bytearray if edit is needed of the boot.bin
"""
LEN = 0x440
DOLOFFSET_OFFSET = 0x420
FSTOFFSET_OFFSET = 0x424
@@ -267,41 +313,54 @@ class BootBin:
self.__data[BootBin.MAXFSTLEN_OFFSET:BootBin.MAXFSTLEN_OFFSET+4] = size.to_bytes(4, "big")
#########################################################################
# class: Dol
# DESCRIPTION Dol is used to find the dol size and group data
# Constructor: dol header datas (bytes)
# adding meaning to hex values and allow to get it's size
#########################################################################
class Dol:
"""
Dol is used to find the dol size and group data adding meaning to hex values and allowing to get it's size.
"""
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):
"""
Get total length using the sum of the 18 sections length and dol header length.
* input: dolheader_data = bytes
* return dol_len = int
"""
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
# Constructor: name of the file or folder
# DESCRIPTION Gcm handle all operations needed by the command parser
#########################################################################
class Gcm:
"""
Gcm handle all operations needed by the command parser.
File format informations: https://sudonull.com/post/68549-Gamecube-file-system-device
"""
BI2BIN_LEN = 0x2000
APPLOADER_HEADER_LEN = 0x20
APPLOADER_OFFSET = 0x2440
APPLOADERSIZE_OFFSET = 0x2454
DVD_MAGIC = b"\xC2\x33\x9F\x3D"
# unpack takes an GCM/iso and unpack it in a folder
def __get_min_file_offset(self, fstbin_data:bytes):
"Get the min file offset to check if there is an overflow."
min_offset = None
for i in range(2, int.from_bytes(fstbin_data[8:12], "big", signed=False)):
if int.from_bytes(fstbin_data[i*12:i*12+1], "big", signed=False) == FstTree.TYPE_FILE:
if min_offset is None:
min_offset = int.from_bytes(fstbin_data[i*12+4:i*12+8], "big", signed=False)
continue
min_offset = min(min_offset, int.from_bytes(fstbin_data[i*12+4:i*12+8], "big", signed=False))
return min_offset
def unpack(self, iso_path:Path, folder_path:Path):
"""
unpack takes an GCM/iso and unpack it in a folder.
input: iso_path = Path
input: 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("Error - Invalid DVD format - this tool is for ISO/GCM files")
raise InvalidDVDMagicError("Error - Invalid DVD format - this tool is for ISO/GCM files")
bi2bin_data = iso_file.read(Gcm.BI2BIN_LEN)
@@ -329,7 +388,7 @@ class Gcm:
if folder_path == Path("."):
folder_path = Path(f"{bootbin.game_code()}-{bootbin.disc_number():02}")
if folder_path.is_dir():
raise Exception(f"Error - \"{folder_path}\" already exist. Remove this folder or use another name for the unpack folder.")
raise InvalidUnpackFolderError(f"Error - \"{folder_path}\" already exist. Remove this folder or use another name for the unpack folder.")
logging.info(f"unpacking \"{iso_path}\" in \"{folder_path}\"")
sys_path = folder_path / "sys"
@@ -385,83 +444,107 @@ class Gcm:
(currentdir_path / name).write_bytes( iso_file.read(filesize) )
logging.debug(f"{iso_path}(0x{fileoffset:x}:0x{fileoffset + filesize:x}) -> {currentdir_path / name}")
# pack takes a folder unpacked by the pack command and pack it in a GCM/iso file
def pack(self, folder_path:Path, iso_path:Path = None):
"""
pack takes a folder unpacked by the pack command and pack it in a GCM/iso file.
input: folder_path = Path
input: iso_path = Path
"""
if iso_path is None:
iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso")
if iso_path.is_file():
raise Exception(f"Error - {iso_path} already exist. Remove this file or use another GCM file name.")
raise InvalidPackIsoError(f"Error - {iso_path} already exist. Remove this file or use another GCM file name.")
with iso_path.open("wb") as iso_file:
sys_path = folder_path / "sys"
logging.debug(f"{sys_path / 'boot.bin'} -> {iso_path}(0x0:0x{BootBin.LEN:x})")
logging.debug(f"{sys_path / 'bi2.bin'} -> {iso_path}(0x{BootBin.LEN:x}:0x{Gcm.APPLOADER_OFFSET:x})")
logging.debug(f"{sys_path / 'apploader.img'} -> {iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + (sys_path / 'apploader.img').stat().st_size:x}")
bootbin = BootBin((sys_path / "boot.bin").read_bytes())
iso_file.write(bootbin.data())
iso_file.write((sys_path / "bi2.bin").read_bytes())
iso_file.write((sys_path / "apploader.img").read_bytes())
fstbin_offset = bootbin.fstbin_offset()
fstbin_len = bootbin.fstbin_len()
if (sys_path / "fst.bin").stat().st_size != fstbin_len:
raise Exception(f"Error - Invalid fst.bin size in boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x}:0x{BootBin.FSTLEN_OFFSET+4:x}!")
logging.debug(f"{sys_path / 'fst.bin'} -> {iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x})")
iso_file.seek( fstbin_offset )
fstbin_data = (sys_path / "fst.bin").read_bytes()
iso_file.write( fstbin_data )
dol_offset = bootbin.dol_offset()
logging.debug(f"{sys_path / 'boot.dol'} -> {iso_path}(0x{dol_offset:x}:0x{dol_offset + (sys_path / 'boot.dol').stat().st_size:x})")
iso_file.seek( dol_offset )
iso_file.write( (sys_path / "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 ]
# Check if there is new / removed files or dirs in the root folder
if nextdir - 1 != len(list(currentdir_path.glob("**/*"))):
raise Exception(f"Error - Invalid file count inside {currentdir_path}. Use --rebuild-fst to update the FST before packing.")
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")
try:
with iso_path.open("wb") as iso_file:
sys_path = folder_path / "sys"
while id == nextdir_arr[-1]:
currentdir_path = currentdir_path.parent
nextdir_arr.pop()
logging.debug(f"{sys_path / 'boot.bin'} -> {iso_path}(0x0:0x{BootBin.LEN:x})")
bootbin = BootBin((sys_path / "boot.bin").read_bytes())
iso_file.write(bootbin.data())
logging.debug(f"{sys_path / 'bi2.bin'} -> {iso_path}(0x{BootBin.LEN:x}:0x{Gcm.APPLOADER_OFFSET:x})")
iso_file.write((sys_path / "bi2.bin").read_bytes())
logging.debug(f"{sys_path / 'apploader.img'} -> {iso_path}(0x{Gcm.APPLOADER_OFFSET:x}:0x{Gcm.APPLOADER_OFFSET + (sys_path / 'apploader.img').stat().st_size:x}")
iso_file.write((sys_path / "apploader.img").read_bytes())
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)
fstbin_offset = bootbin.fstbin_offset()
fstbin_len = bootbin.fstbin_len()
if (sys_path / "fst.bin").stat().st_size != fstbin_len:
raise InvalidFSTSizeError(f"Error - Invalid fst.bin size in boot.bin offset 0x{BootBin.FSTLEN_OFFSET:x}:0x{BootBin.FSTLEN_OFFSET+4:x}!")
logging.debug(f"{sys_path / 'fst.bin'} -> {iso_path}(0x{fstbin_offset:x}:0x{fstbin_offset + fstbin_len:x})")
iso_file.seek( fstbin_offset )
fstbin_data = (sys_path / "fst.bin").read_bytes()
iso_file.write( fstbin_data )
dol_offset = bootbin.dol_offset()
dol_end_offset = dol_offset + (sys_path / 'boot.dol').stat().st_size
# FST can be before the dol or after
if dol_offset < fstbin_offset < dol_end_offset or (fstbin_offset < dol_offset and dol_end_offset > self.__get_min_file_offset(fstbin_data)):
raise DolSizeOverflowError("Error - The dol size has been increased and overflow on next file or on FST. To solve this use --rebuild-fst.")
logging.debug(f"{sys_path / 'boot.dol'} -> {iso_path}(0x{dol_offset:x}:0x{dol_end_offset:x})")
iso_file.seek( dol_offset )
iso_file.write( (sys_path / "boot.dol").read_bytes() )
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)
# Now parse fst.bin for writing files in the iso
dir_id_path = {0: folder_path / "root"}
currentdir_path = folder_path / "root"
if (currentdir_path / name).stat().st_size != file_len:
raise Exception(f"Error - 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() )
# rebuild FST generate a new file system by using all files in the root folder
# it also patch boot.bin caracteristics and apploader.img or also file system changes.
# Game dol use filenames to find files so be carrefull when changing the root filesystem
# 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 ]
# Check if there is new / removed files or dirs in the root folder
if nextdir - 1 != len(list(currentdir_path.glob("**/*"))):
raise InvalidRootFileFolderCountError(f"Error - Invalid file & folders count inside {currentdir_path}. Use --rebuild-fst to update the FST before packing.")
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
if not currentdir_path.is_dir():
raise FSTDirNotFoundError(f"Error - FST dir {currentdir_path} not found in the root directory. "
"The dir has been removed or renamed. Use --rebuild-fst to update the FST and avoid this error."
"Warning: DVD SDK use dirnames to load files from the GCM/iso.")
else:
if not (currentdir_path / name).is_file():
raise FSTFileNotFoundError(f"Error - FST file {currentdir_path / name} not found in the root directory. "
"The file has been removed or renamed. Use --rebuild-fst to update the FST and avoid this error."
"Warning: DVD SDK use filenames to load files from the GCM/iso.")
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 InvalidFSTFileSizeError(f"Error - 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() )
except (InvalidFSTSizeError, DolSizeOverflowError, InvalidRootFileFolderCountError, InvalidFSTFileSizeError, FSTDirNotFoundError, FSTFileNotFoundError):
iso_path.unlink()
raise
def rebuild_fst(self, folder_path:Path, align:int):
"""
Rebuild FST generate a new file system by using all files in the root folder
it also patch boot.bin caracteristics and apploader.img or also file system changes.
Game dol use filenames to find files so be carrefull when changing the root filesystem.
input: folder_path = Path
input: align = int
"""
root_path = folder_path / "root"
sys_path = folder_path / "sys"
@@ -494,18 +577,24 @@ class Gcm:
bootbin.set_max_fst_len(fst_size)
(sys_path / "boot.bin").write_bytes(bootbin.data())
# get_sys_from_folder allow to load system from an unpacked GCM/iso folder
# it returns informations for the stats command
def __get_sys_from_folder(self, file_path:Path):
sys_path = file_path / "sys"
def __get_sys_from_folder(self, folder_path:Path):
"""
Load system files from an unpacked GCM/iso folder and returns informations for the stats command.
input: folder_path = Path
return (BootBin, apploader_size:int, dol_len:int, fstbin_data:bytes)
"""
sys_path = folder_path / "sys"
bootbin = BootBin((sys_path / "boot.bin").read_bytes())
apploader_size = (sys_path / "apploader.img").stat().st_size
dol_len = (sys_path / "boot.dol").stat().st_size
fstbin_data = (sys_path / "fst.bin").read_bytes()
return (bootbin, apploader_size, dol_len, fstbin_data)
# get_sys_from_file allow to load system from a GCM/iso file
# it returns informations for the stats command
def __get_sys_from_file(self, file_path:Path):
"""
Load system files from a GCM/iso file and returns informations for the stats command.
input: folder_path = Path
return (BootBin, apploader_size:int, dol_len:int, fstbin_data:bytes)
"""
bootbin = None
apploader_size = None
dol_len = None
@@ -521,10 +610,13 @@ class Gcm:
iso_file.seek( bootbin.fstbin_offset() )
fstbin_data = iso_file.read(bootbin.fstbin_len())
return (bootbin, apploader_size, dol_len, fstbin_data)
# Stats print SYS files informations
# global memory mapping
# empty spaces inside the GCM/iso
def stats(self, path:Path, align:int = 4):
"""
Print SYS files informations, global memory mapping, empty spaces inside the GCM/iso
input:
* path = Path (folder or iso/GCM file)
* align = int
"""
(bootbin, apploader_size, dol_len, fstbin_data) = self.__get_sys_from_folder(path) if path.is_dir() else self.__get_sys_from_file(path)
# Begin offset - end offset - length - name
@@ -574,7 +666,7 @@ class Gcm:
if last_offset < mapping_lists[i][0]:
empty_space_tuples.append( (f"{last_offset:08x}", f"{mapping_lists[i][0]:08x}", f"{mapping_lists[i][0] - last_offset:08x}", "") )
elif last_offset > mapping_lists[i][0]:
raise Exception(f"Error - Bad align ({align})! Offsets collision.")
raise BadAlignError(f"Error - Bad align ({align})! Offsets collision.")
last_offset = align_offset(mapping_lists[i][1], align)
mapping_lists[i][0] = f"{mapping_lists[i][0]:08x}"
mapping_lists[i][1] = f"{mapping_lists[i][1]:08x}"
@@ -582,7 +674,12 @@ class Gcm:
print(f"# Stats for \"{path}\":")
self.__print("Global memory mapping:", mapping_lists)
self.__print(f"Empty spaces (align={align}):", empty_space_tuples)
def __print(self, title:str, lines_tuples):#, columns:list = list(range(3))):
def __print(self, title:str, lines_tuples):
"""
Print a table with a title.
* input: title = str
* input: lines_tuples = [(b_offset:str, e_offset:str, length:str, Name:str), ...]
"""
stats_buffer = "#"*70+f"\n# {title}\n"+"#"*70+"\n| b offset | e offset | length | Name\n|"+"-"*69+"\n"
for line in lines_tuples:
stats_buffer += "| "+" | ".join(line)+"\n"
@@ -631,6 +728,6 @@ if __name__ == '__main__':
elif args.rebuild_fst:
logging.info("### Rebuilding FST and patching boot.bin")
if args.align < 1:
raise Exception("Error - Align must be > 0.")
raise BadAlignError("Error - Align must be > 0.")
logging.info(f"Using alignment: {args.align}")
gcm.rebuild_fst(p_input, args.align)