Gran Turismo File System (GTFS): Python parsing library

File extension


KS implementation details

License: CC0-1.0


This page hosts a formal specification of Gran Turismo File System (GTFS) using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.


Runtime library

All parsing code for Python generated by Kaitai Struct depends on the Python runtime library. You have to install it before you can parse data.

The Python runtime library can be installed from PyPI:

python3 -m pip install kaitaistruct


Parse a local file and get structure in memory:

data = GranTurismoVol.from_file("path/to/local/file.vol")

Or parse structure from a bytes:

from kaitaistruct import KaitaiStream, BytesIO

raw = b"\x00\x01\x02..."
data = GranTurismoVol(KaitaiStream(BytesIO(raw)))

After that, one can get various attributes from the structure by invoking getter methods like:

data.magic # => get magic

Python source code to parse Gran Turismo File System (GTFS)

# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild

import kaitaistruct
from kaitaistruct import KaitaiStruct, KaitaiStream, BytesIO

if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 9):
    raise Exception("Incompatible Kaitai Struct Python API: 0.9 or later is required, but you have %s" % (kaitaistruct.__version__))

class GranTurismoVol(KaitaiStruct):
    def __init__(self, _io, _parent=None, _root=None):
        self._io = _io
        self._parent = _parent
        self._root = _root if _root else self

    def _read(self):
        self.magic = self._io.read_bytes(8)
        if not self.magic == b"\x47\x54\x46\x53\x00\x00\x00\x00":
            raise kaitaistruct.ValidationNotEqualError(b"\x47\x54\x46\x53\x00\x00\x00\x00", self.magic, self._io, u"/seq/0")
        self.num_files = self._io.read_u2le()
        self.num_entries = self._io.read_u2le()
        self.reserved = self._io.read_bytes(4)
        if not self.reserved == b"\x00\x00\x00\x00":
            raise kaitaistruct.ValidationNotEqualError(b"\x00\x00\x00\x00", self.reserved, self._io, u"/seq/3")
        self.offsets = []
        for i in range(self.num_files):

    class FileInfo(KaitaiStruct):
        def __init__(self, _io, _parent=None, _root=None):
            self._io = _io
            self._parent = _parent
            self._root = _root if _root else self

        def _read(self):
            self.timestamp = self._io.read_u4le()
            self.offset_idx = self._io.read_u2le()
            self.flags = self._io.read_u1()
   = (KaitaiStream.bytes_terminate(KaitaiStream.bytes_strip_right(self._io.read_bytes(25), 0), 0, False)).decode(u"ASCII")

        def size(self):
            if hasattr(self, '_m_size'):
                return self._m_size

            self._m_size = ((self._root.offsets[(self.offset_idx + 1)] & 4294965248) - self._root.offsets[self.offset_idx])
            return getattr(self, '_m_size', None)

        def body(self):
            if hasattr(self, '_m_body'):
                return self._m_body

            if not (self.is_dir):
                _pos = self._io.pos()
      [self.offset_idx] & 4294965248))
                self._m_body = self._io.read_bytes(self.size)

            return getattr(self, '_m_body', None)

        def is_dir(self):
            if hasattr(self, '_m_is_dir'):
                return self._m_is_dir

            self._m_is_dir = (self.flags & 1) != 0
            return getattr(self, '_m_is_dir', None)

        def is_last_entry(self):
            if hasattr(self, '_m_is_last_entry'):
                return self._m_is_last_entry

            self._m_is_last_entry = (self.flags & 128) != 0
            return getattr(self, '_m_is_last_entry', None)

    def ofs_dir(self):
        if hasattr(self, '_m_ofs_dir'):
            return self._m_ofs_dir

        self._m_ofs_dir = self.offsets[1]
        return getattr(self, '_m_ofs_dir', None)

    def files(self):
        if hasattr(self, '_m_files'):
            return self._m_files

        _pos = self._io.pos() & 4294965248))
        self._m_files = []
        for i in range(self._root.num_entries):
            self._m_files.append(GranTurismoVol.FileInfo(self._io, self, self._root))
        return getattr(self, '_m_files', None)