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Update gcmtool.py
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tmpz23
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@ -3,23 +3,46 @@ from pathlib import Path
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import logging
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__version__ = "0.1.0"
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__version__ = "0.1.1"
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__author__ = "rigodron, algoflash, GGLinnk"
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__license__ = "MIT"
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__status__ = "developpement"
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#########################################################################
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# FUNCTION: align_offset
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# IN: Offset to align (file offset to place inside the iso for instance)
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# IN: align wich could change with some GCM
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# OUT: upper rouded offset aligned using the align value
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# DESCRIPTION Give the upper rounded offset by the align value
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#########################################################################
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def align_offset(offset:int, align:int):
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if offset % align != 0:
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offset += align - (offset % align)
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return offset
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#########################################################################
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# class: Fst
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# DESCRIPTION This could be changed te be an Enum FlagInt
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#########################################################################
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class Fst:
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TYPE_FILE = 0
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TYPE_DIR = 1
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#########################################################################
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# Interface: Node
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# Constructor: name of the file or folder
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# DESCRIPTION Used to be herited by File and Folder classes
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# It groups common properties and allow an FST rebuid:
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# FST use a base_name block and name offsets relative to it for
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# all entries: Files or Folders. So we handle name in this interface.
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# name offset will be set during the FstTree.__prepare() aftet all
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# of the three elements are added.
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# Also every File and Folder get an ID. This ID is important when
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# rebuilding the FST with folders (next dir, parent dir) ...
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#########################################################################
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class Node:
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__id = None
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__name = None
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@ -33,6 +56,13 @@ class Node:
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def set_name_offset(self, name_offset:int): self.__name_offset = name_offset
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#########################################################################
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# class: File
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# Constructor: name of the file and size
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# DESCRIPTION Use a global class attribute TYPE_FILE and store necessary
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# informations format it's FST 12 bytes entry
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# This properties are type/name_offset/gcm offset/size
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#########################################################################
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class File(Node):
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__type = Fst.TYPE_FILE
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__size = None
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@ -50,6 +80,14 @@ class File(Node):
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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")
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#########################################################################
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# class: Folder
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# Constructor: name of the file and parent
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# DESCRIPTION Use a global class attribute TYPE_DIR and store necessary
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# informations to format it's FST 12 bytes entry
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# this class is intended to hold the tree with multiple childs
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# and one parent only. The next dir is the total number of childs + 1
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#########################################################################
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class Folder(Node):
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__type = Fst.TYPE_DIR
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__parent = None
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@ -77,16 +115,30 @@ class Folder(Node):
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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")
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#########################################################################
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# class: FstTree
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# Constructor: root_path (the part with folder that are out of the tree)
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# fst_offset (to know where is the current min offset before
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# adding the fst and name_block length)
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# align (It could change in some GCM)
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# DESCRIPTION FstTree is responsible for creating and formating the FST and name_block
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# We store a root Node that is a special Folder
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#########################################################################
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class FstTree(Fst):
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# 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
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__root_path_length = None
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__root_node = None
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# We start at root-node with id=0
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__current_id = 0
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# We will align this offset to the next available place after new packed file
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__current_file_offset = None
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__align = None
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__fst_block = None
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__name_block = None
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__nameblock_length = None # Used to find min file_offset when fst is at the end of the iso beginning
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# 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)
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__nameblock_length = None
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def __init__(self, root_path:Path, fst_offset:int, align:int = 4):
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# as said before we don't want to add parents folder that don't are used in the folder we are packing
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self.__root_path_length = len(root_path.parts)
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self.__root_node = Folder(root_path.name, None)
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self.__align = align
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@ -96,6 +148,7 @@ class FstTree(Fst):
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self.__current_file_offset = fst_offset
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def __str__(self):
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return self.__to_str(self.__root_node)
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# Recursive Tree printing for debug
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def __to_str(self, node:Node, depth=0):
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result = (depth * " ") + str(node) +"\n"
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if node.type() == FstTree.TYPE_DIR:
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@ -106,6 +159,7 @@ class FstTree(Fst):
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def __get_fst_length(self):
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self.__generate_nameblock_length()
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return align_offset(self.__count_childs(self.__root_node)*12 + 12 + self.__nameblock_length, self.__align)
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# Recursive walk into the tree to get total name_block length
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def __generate_nameblock_length(self, node:Node = None):
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if node is None:
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node = self.__root_node
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@ -114,17 +168,25 @@ class FstTree(Fst):
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if node.type() == FstTree.TYPE_DIR:
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for child in node.childs():
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self.__generate_nameblock_length(child)
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# We populate recursivly every Nodes with required informations for formating and
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# generate the name_block and fst_block
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def __prepare(self, node:Node = None):
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name_offset = 0
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# For root Node we build the nameblock with null trailing byte
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# For others we build the name_block and update the name_offset
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if node is None:
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node = self.__root_node
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else:
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name_offset = len(self.__name_block)
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self.__name_block += node.name().encode("utf-8")+b"\x00"
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# We set the name_offset, the id, we increment for next walked node
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node.set_name_offset(name_offset)
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node.set_id(self.__current_id)
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self.__current_id += 1
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# If it's a directory we have to count childs to set nextdir
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# If it's a file we have to set the offset and add length aligned to it for finding next available offset
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# At the end we add to the fst_block our formated Node
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if node.type() == FstTree.TYPE_DIR:
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node.set_next_dir(self.__current_id + self.__count_childs(node))
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if node == self.__root_node:
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@ -143,6 +205,9 @@ class FstTree(Fst):
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if child.type() == FstTree.TYPE_DIR:
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count += self.__count_childs(child)
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return count + len(node.childs())
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# Add a path with each folder as Folder class and the File as a leave
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# We take care to set parent and childs for folder also necessary informations
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# name / size ...
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def add_node_by_path(self, node_path:Path):
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parent = self.__root_node
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node = None
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@ -154,12 +219,22 @@ class FstTree(Fst):
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else:
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node = Folder(node_path.name, parent)
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parent.add_child(node)
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# We generate the FST
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# the hard part Here is that we have to know the result before
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# knowing where we can begin to add files
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def generate_fst(self):
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self.__current_file_offset += self.__get_fst_length()
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self.__prepare()
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return self.__fst_block + self.__name_block
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#########################################################################
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# class: BootBin
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# Constructor: datas (bytes or bytearray id edit is needed) of the boot.bin
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# DESCRIPTION BootBin group all operations related to the boot.bin system file
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# using this class avoid errors and it's easier elsewhere
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# this groupment add meaning to hex values but we can also patch it
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#########################################################################
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class BootBin:
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LEN = 0x440
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DOLOFFSET_OFFSET = 0x420
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@ -192,6 +267,12 @@ class BootBin:
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self.__data[BootBin.MAXFSTLEN_OFFSET:BootBin.MAXFSTLEN_OFFSET+4] = size.to_bytes(4, "big")
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#########################################################################
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# class: Dol
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# DESCRIPTION Dol is used to find the dol size and group data
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# Constructor: dol header datas (bytes)
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# adding meaning to hex values and allow to get it's size
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#########################################################################
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class Dol:
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HEADER_LEN = 0x100
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HEADER_SECTIONLENTABLE_OFFSET = 0x90
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@ -204,12 +285,18 @@ class Dol:
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# https://sudonull.com/post/68549-Gamecube-file-system-device
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#########################################################################
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# class: Gcm
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# Constructor: name of the file or folder
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# DESCRIPTION Gcm handle all operations needed by the command parser
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#########################################################################
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class Gcm:
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BI2BIN_LEN = 0x2000
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APPLOADER_HEADER_LEN = 0x20
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APPLOADER_OFFSET = 0x2440
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APPLOADERSIZE_OFFSET = 0x2454
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DVD_MAGIC = b"\xC2\x33\x9F\x3D"
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# unpack takes an GCM/iso and unpack it in a folder
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def unpack(self, iso_path:Path, folder_path:Path):
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with iso_path.open("rb") as iso_file:
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bootbin = BootBin(iso_file.read(BootBin.LEN))
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@ -298,6 +385,7 @@ class Gcm:
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(currentdir_path / name).write_bytes( iso_file.read(filesize) )
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logging.debug(f"{iso_path}(0x{fileoffset:x}:0x{fileoffset + filesize:x}) -> {currentdir_path / name}")
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# pack takes a folder unpacked by the pack command and pack it in a GCM/iso file
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def pack(self, folder_path:Path, iso_path:Path = None):
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if iso_path is None:
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iso_path = folder_path.parent / Path(folder_path.name).with_suffix(".iso")
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@ -370,6 +458,9 @@ class Gcm:
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logging.debug(f"{currentdir_path / name} -> {iso_path}(0x{file_offset:x}:0x{file_offset + file_len:x})")
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iso_file.seek(file_offset)
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iso_file.write( (currentdir_path / name).read_bytes() )
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# rebuild FST generate a new file system by using all files in the root folder
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# it also patch boot.bin caracteristics and apploader.img or also file system changes.
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# Game dol use filenames to find files so be carrefull when changing the root filesystem
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def rebuild_fst(self, folder_path:Path, align:int):
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root_path = folder_path / "root"
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sys_path = folder_path / "sys"
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@ -403,6 +494,8 @@ class Gcm:
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bootbin.set_max_fst_len(fst_size)
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(sys_path / "boot.bin").write_bytes(bootbin.data())
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# get_sys_from_folder allow to load system from an unpacked GCM/iso folder
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# it returns informations for the stats command
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def __get_sys_from_folder(self, file_path:Path):
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sys_path = file_path / "sys"
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bootbin = BootBin((sys_path / "boot.bin").read_bytes())
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@ -410,6 +503,8 @@ class Gcm:
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dol_len = (sys_path / "boot.dol").stat().st_size
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fstbin_data = (sys_path / "fst.bin").read_bytes()
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return (bootbin, apploader_size, dol_len, fstbin_data)
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# get_sys_from_file allow to load system from a GCM/iso file
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# it returns informations for the stats command
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def __get_sys_from_file(self, file_path:Path):
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bootbin = None
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apploader_size = None
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@ -426,6 +521,9 @@ class Gcm:
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iso_file.seek( bootbin.fstbin_offset() )
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fstbin_data = iso_file.read(bootbin.fstbin_len())
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return (bootbin, apploader_size, dol_len, fstbin_data)
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# Stats print SYS files informations
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# global memory mapping
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# empty spaces inside the GCM/iso
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def stats(self, path:Path, align:int = 4):
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(bootbin, apploader_size, dol_len, fstbin_data) = self.__get_sys_from_folder(path) if path.is_dir() else self.__get_sys_from_file(path)
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