PythonLib/isotool.py

import struct
import argparse
from pathlib import Path
from dataclasses import dataclass


@dataclass
class FileListData:
    path: Path
    inode: int


@dataclass
class FileListInfo:
    files: list[FileListData]
    total_inodes: int


def main():
    print("pyPS2 ISO Rebuilder")
    print("Original by Raynê Games")

    args = get_arguments()

    if args.mode == "extract":
        print("Dumping mode is not (re)implemented yet!")
        # dump_iso(args.iso, args.filelist, args.files, args.output)
    else:
        rebuild_iso(args.iso, args.filelist, args.files, args.output, args.with_padding)
        print("rebuild finished")


def get_arguments(argv=None):
    # Init argument parser
    parser = argparse.ArgumentParser()

    parser.add_argument(
        "-m",
        "--mode",
        choices=["extract", "insert"],
        required=True,
        metavar="operation",
        help="Options: extract, insert",
    )

    parser.add_argument(
        "--iso",
        required=True,
        type=Path,
        metavar="original_iso",
        help="input game iso file path",
    )

    parser.add_argument(
        "--with-padding",
        required=False,
        action="store_true",
        help="flag to control outermost iso padding",
    )

    parser.add_argument(
        "-o",
        "--output",
        required=False,
        type=Path,
        metavar="output_iso",
        help="resulting iso file name",
    )

    parser.add_argument(
        "--filelist",
        required=False,
        type=Path,
        metavar="filelist_path",
        help="filelist.txt file path",
    )

    parser.add_argument(
        "--files",
        required=False,
        type=Path,
        metavar="files_folder",
        help="path to folder with extracted iso files",
    )

    args = parser.parse_args()
    curr_dir = Path("./").resolve()

    args.iso = args.iso.resolve()
    if hasattr(args, "filelist") and not args.filelist:
        args.filelist = curr_dir / f"{args.iso.name.upper()}-FILELIST-LSN.TXT"

    if hasattr(args, "files") and not args.files:
        args.files = curr_dir / f"@{args.iso.name.upper()}"

    if hasattr(args, "output") and not args.output:
        args.output = curr_dir / f"NEW_{args.iso.name}"

    return args


def dump_iso(
    iso_path: Path, filelist: Path, iso_files: Path, output: Path, add_padding: bool
) -> None:
    # curr_file = (file_info *)malloc(24u);
    # Both arrays have 6000 elements
    # seen_lbas = (int *)malloc(0x5DC0u);
    # fdata_arr = (file_data *)malloc(0x188940u);

    # make path all uppercase
    PathName = f"@{iso_path.name}".upper()
    Path(PathName).mkdir(parents=True, exist_ok=True)

    with open(iso_path, "rb") as iso:
        # Go to PathTableTypeL and check how many folders are there
        # Original just kept going until it found a 0x00 byte, we'll
        # trust the PVD about the size of the PathTable and parse each
        # field
        #
        # Also, the original checked that the name was only A-Z 0-9 ' ' and _
        # but didn't bail out or anything, so we'll skip the check and
        # assume the folders have valid names
        iso.seek(0x8084)
        path_table_size = struct.unpack("<I", iso.read(4))[0]

        total_folders = 0
        iso.seek(0x80800)
        while iso.tell() < 0x80800 + path_table_size:
            name_len = struct.unpack("<B7x", iso.read(8))[0]
            iso.read(name_len)
            total_folders += 1

        found_files = 0
        iso.seek(0x80802)
        root_dir_record_start = struct.unpack("<I", iso.read(4))[0] * 0x800
        iso.seek(root_dir_record_start + 10)
        root_dir_record_end = (
            root_dir_record_start + struct.unpack("<I", iso.read(4))[0]
        )
        root_file_records_start = root_dir_record_start + 0x60
        iso.seek(root_dir_record_start + 0x60)
        nested_folder_lba = 0
        nested_folder_record_end = 0
        root_folder_lba = 0
        a3 = 0
        root_dir_record_end_1 = root_dir_record_end + 1
        v44 = "1"

        # TODO: make the dumping logic


def rebuild_iso(
    iso: Path, filelist: Path, iso_files: Path, output: Path, add_padding: bool
) -> None:

    if filelist.exists() == False:
        print(f"Could not to find the '{filelist.name}' files log!")
        return

    if iso_files.exists() == False:
        print(f"Could not to find the '{iso_files.name}' files directory!")
        return

    if iso_files.is_dir() == False:
        print(f"'{iso_files.name}' is not a directory!")
        return

    with open(filelist, "r") as f:
        lines = f.readlines()

    inode_data: list[FileListData] = []
    for line in lines[:-1]:
        l = [x for x in line.split("|") if x]
        p = Path(l[1])
        inode_data.append(FileListData(Path(*p.parts[1:]), int(l[0])))

    if lines[-1].startswith("//") == False:
        print(f"Could not to find the '{filelist.name}' inode total!")
        return

    iso_info = FileListInfo(inode_data, int(lines[-1][2:]))

    with open(iso, "rb") as f:
        header = f.read(0xF60000)
        i = 0
        data_start = -1
        for lba in range(7862):
            udf_check = struct.unpack_from("<269x18s1761x", header, lba * 0x800)[0]
            if udf_check == b"*UDF DVD CGMS Info":
                i += 1

            if i == iso_info.total_inodes + 1:
                data_start = (lba + 1) * 0x800
                break
        else:
            print(
                "ERROR: Couldn't get all the UDF file chunk, original tool would've looped here"
            )
            print("Closing instead...")
            return

        f.seek(-0x800, 2)
        footer = f.read(0x800)

    with open(output, "wb+") as f:
        f.write(header[:data_start])

        for inode in inode_data:
            fp = iso_files / inode.path
            start_pos = f.tell()
            if fp.exists() == False:
                print(f"File '{inode.path}' not found!")
                return

            print(f"Inserting {str(inode.path)}...")

            with open(fp, "rb") as g:
                while data := g.read(0x80000):
                    f.write(data)

            end_pos = f.tell()

            # Align to next LBA
            al_end = (end_pos + 0x7FF) & ~(0x7FF)
            f.write(b"\x00" * (al_end - end_pos))

            end_save = f.tell()

            new_lba = start_pos // 0x800
            new_size = end_pos - start_pos
            f.seek(inode.inode + 2)

            f.write(struct.pack("<I", new_lba))
            f.write(struct.pack(">I", new_lba))
            f.write(struct.pack("<I", new_size))
            f.write(struct.pack(">I", new_size))

            f.seek(end_save)

        # Align to 0x8000
        end_pos = f.tell()
        al_end = (end_pos + 0x7FFF) & ~(0x7FFF)
        f.write(b"\x00" * (al_end - end_pos))

        # Sony's cdvdgen tool starting with v2.00 by deafault adds
        # a 20MiB padding to the end of the PVD, add it here if requested
        # minus a whole LBA for the end of file Anchor
        if add_padding:
            f.write(b"\x00" * (0x140_0000 - 0x800))

        last_pvd_lba = f.tell() // 0x800

        f.write(footer)
        f.seek(0x8050)
        f.write(struct.pack("<I", last_pvd_lba))
        f.write(struct.pack(">I", last_pvd_lba))
        f.seek(-0x7F4, 2)
        f.write(struct.pack("<I", last_pvd_lba))


# TODO: remove these
def sub_402B40(lba: int, blk: list[int], i: int) -> None:
    blk[i] = lba


def sub_402D40(FileName: str, iso, lba: int, size: int):
    iso.seek(lba * 0x800)
    # sub_402B80((unsigned __int8 *)FileName);
    Path(FileName).parent.mkdir(parents=True, exist_ok=True)
    with open(FileName, "wb+") as f:
        f.write(iso.read(size))
    print(FileName)  # why here?


# Don't even date to look at this in the original program
# it does the following read the size field from back to front
# convert it to string, so 0xDEADBEEF -> "DEADBEEF"
# loop each character and do acc += pow(16.0, pos) * char
# YES with double floats, and then, finally store it
# dunno why size is different when the lba field was just
# normal god fearing byte shifting and casting to int64
#
# Anyway, Block is an ISO9660 DirectoryRecord
def sub_402350(Block, a3):
    a3.byte15 = "2"
    a3.lba = struct.unpack_from("<I", Block, 1)[0]
    a3.size = struct.unpack_from("<I", Block, 9)[0]

    name_len = struct.unpack_from("<B", Block, 0x1F)[0]
    a3.file_name = ""
    if name_len != 0:
        fname: str = struct.unpack_from(f"<{name_len}s", Block, 0x1F)[0].decode("ascii")
        if ";" in fname:
            a3.byte15 = "1"
            a3.file_name = fname[:-2]
        else:
            a3.file_name = fname

    return a3


if __name__ == "__main__":
    main()