.trd file is a raw dump of TR-DOS (ZX-Spectrum) floppy. .trd files are headerless and contain consequent "logical tracks", each logical track consists of 16 256-byte sectors.
Logical tracks are defined the same way as used by TR-DOS: for single-side floppies it's just a physical track number, for two-side floppies sides are interleaved, i.e. logical_track_num = (physical_track_num << 1) | side
So, this format definition is more for TR-DOS filesystem than for .trd files, which are formatless.
Strings (file names, disk label, disk password) are padded with spaces and use ZX Spectrum character set, including UDGs, block drawing chars and Basic tokens. ASCII range is mostly standard ASCII, with few characters (^, `, DEL) replaced with (up arrow, pound, copyright symbol).
.trd file can be smaller than actual floppy disk, if last logical tracks are empty (contain no file data) they can be omitted.
This page hosts a formal specification of TR-DOS flat-file disk image using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.
# This is a generated file! Please edit source .ksy file and use kaitai-struct-compiler to rebuild
# type: ignore
import kaitaistruct
from kaitaistruct import ReadWriteKaitaiStruct, KaitaiStream, BytesIO
from enum import IntEnum
if getattr(kaitaistruct, 'API_VERSION', (0, 9)) < (0, 11):
raise Exception("Incompatible Kaitai Struct Python API: 0.11 or later is required, but you have %s" % (kaitaistruct.__version__))
class TrDosImage(ReadWriteKaitaiStruct):
""".trd file is a raw dump of TR-DOS (ZX-Spectrum) floppy. .trd files are
headerless and contain consequent "logical tracks", each logical track
consists of 16 256-byte sectors.
Logical tracks are defined the same way as used by TR-DOS: for single-side
floppies it's just a physical track number, for two-side floppies sides are
interleaved, i.e. logical_track_num = (physical_track_num << 1) | side
So, this format definition is more for TR-DOS filesystem than for .trd files,
which are formatless.
Strings (file names, disk label, disk password) are padded with spaces and use
ZX Spectrum character set, including UDGs, block drawing chars and Basic
tokens. ASCII range is mostly standard ASCII, with few characters (^, `, DEL)
replaced with (up arrow, pound, copyright symbol).
.trd file can be smaller than actual floppy disk, if last logical tracks are
empty (contain no file data) they can be omitted.
"""
class DiskType(IntEnum):
type_80_tracks_double_side = 22
type_40_tracks_double_side = 23
type_80_tracks_single_side = 24
type_40_tracks_single_side = 25
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage, self).__init__(_io)
self._parent = _parent
self._root = _root or self
self._should_write_volume_info = False
self.volume_info__enabled = True
def _read(self):
self.files = []
i = 0
while True:
_t_files = TrDosImage.File(self._io, self, self._root)
try:
_t_files._read()
finally:
_ = _t_files
self.files.append(_)
if _.is_terminator:
break
i += 1
self._dirty = False
def _fetch_instances(self):
pass
for i in range(len(self.files)):
pass
self.files[i]._fetch_instances()
_ = self.volume_info
if hasattr(self, '_m_volume_info'):
pass
self._m_volume_info._fetch_instances()
def _write__seq(self, io=None):
super(TrDosImage, self)._write__seq(io)
self._should_write_volume_info = self.volume_info__enabled
for i in range(len(self.files)):
pass
self.files[i]._write__seq(self._io)
def _check(self):
if len(self.files) == 0:
raise kaitaistruct.ConsistencyError(u"files", 0, len(self.files))
for i in range(len(self.files)):
pass
if self.files[i]._root != self._root:
raise kaitaistruct.ConsistencyError(u"files", self._root, self.files[i]._root)
if self.files[i]._parent != self:
raise kaitaistruct.ConsistencyError(u"files", self, self.files[i]._parent)
_ = self.files[i]
if _.is_terminator != (i == len(self.files) - 1):
raise kaitaistruct.ConsistencyError(u"files", i == len(self.files) - 1, _.is_terminator)
if self.volume_info__enabled:
pass
if self._m_volume_info._root != self._root:
raise kaitaistruct.ConsistencyError(u"volume_info", self._root, self._m_volume_info._root)
if self._m_volume_info._parent != self:
raise kaitaistruct.ConsistencyError(u"volume_info", self, self._m_volume_info._parent)
self._dirty = False
class File(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.File, self).__init__(_io)
self._parent = _parent
self._root = _root
self._should_write_contents = False
self.contents__enabled = True
def _read(self):
self._raw_name = self._io.read_bytes(8)
_io__raw_name = KaitaiStream(BytesIO(self._raw_name))
self.name = TrDosImage.Filename(_io__raw_name, self, self._root)
self.name._read()
self.extension = self._io.read_u1()
_on = self.extension
if _on == 35:
pass
self.position_and_length = TrDosImage.PositionAndLengthPrint(self._io, self, self._root)
self.position_and_length._read()
elif _on == 66:
pass
self.position_and_length = TrDosImage.PositionAndLengthBasic(self._io, self, self._root)
self.position_and_length._read()
elif _on == 67:
pass
self.position_and_length = TrDosImage.PositionAndLengthCode(self._io, self, self._root)
self.position_and_length._read()
else:
pass
self.position_and_length = TrDosImage.PositionAndLengthGeneric(self._io, self, self._root)
self.position_and_length._read()
self.length_sectors = self._io.read_u1()
self.starting_sector = self._io.read_u1()
self.starting_track = self._io.read_u1()
self._dirty = False
def _fetch_instances(self):
pass
self.name._fetch_instances()
_on = self.extension
if _on == 35:
pass
self.position_and_length._fetch_instances()
elif _on == 66:
pass
self.position_and_length._fetch_instances()
elif _on == 67:
pass
self.position_and_length._fetch_instances()
else:
pass
self.position_and_length._fetch_instances()
_ = self.contents
if hasattr(self, '_m_contents'):
pass
def _write__seq(self, io=None):
super(TrDosImage.File, self)._write__seq(io)
self._should_write_contents = self.contents__enabled
_io__raw_name = KaitaiStream(BytesIO(bytearray(8)))
self._io.add_child_stream(_io__raw_name)
_pos2 = self._io.pos()
self._io.seek(self._io.pos() + (8))
def handler(parent, _io__raw_name=_io__raw_name):
self._raw_name = _io__raw_name.to_byte_array()
if len(self._raw_name) != 8:
raise kaitaistruct.ConsistencyError(u"raw(name)", 8, len(self._raw_name))
parent.write_bytes(self._raw_name)
_io__raw_name.write_back_handler = KaitaiStream.WriteBackHandler(_pos2, handler)
self.name._write__seq(_io__raw_name)
self._io.write_u1(self.extension)
_on = self.extension
if _on == 35:
pass
self.position_and_length._write__seq(self._io)
elif _on == 66:
pass
self.position_and_length._write__seq(self._io)
elif _on == 67:
pass
self.position_and_length._write__seq(self._io)
else:
pass
self.position_and_length._write__seq(self._io)
self._io.write_u1(self.length_sectors)
self._io.write_u1(self.starting_sector)
self._io.write_u1(self.starting_track)
def _check(self):
if self.name._root != self._root:
raise kaitaistruct.ConsistencyError(u"name", self._root, self.name._root)
if self.name._parent != self:
raise kaitaistruct.ConsistencyError(u"name", self, self.name._parent)
_on = self.extension
if _on == 35:
pass
if self.position_and_length._root != self._root:
raise kaitaistruct.ConsistencyError(u"position_and_length", self._root, self.position_and_length._root)
if self.position_and_length._parent != self:
raise kaitaistruct.ConsistencyError(u"position_and_length", self, self.position_and_length._parent)
elif _on == 66:
pass
if self.position_and_length._root != self._root:
raise kaitaistruct.ConsistencyError(u"position_and_length", self._root, self.position_and_length._root)
if self.position_and_length._parent != self:
raise kaitaistruct.ConsistencyError(u"position_and_length", self, self.position_and_length._parent)
elif _on == 67:
pass
if self.position_and_length._root != self._root:
raise kaitaistruct.ConsistencyError(u"position_and_length", self._root, self.position_and_length._root)
if self.position_and_length._parent != self:
raise kaitaistruct.ConsistencyError(u"position_and_length", self, self.position_and_length._parent)
else:
pass
if self.position_and_length._root != self._root:
raise kaitaistruct.ConsistencyError(u"position_and_length", self._root, self.position_and_length._root)
if self.position_and_length._parent != self:
raise kaitaistruct.ConsistencyError(u"position_and_length", self, self.position_and_length._parent)
if self.contents__enabled:
pass
if len(self._m_contents) != self.length_sectors * 256:
raise kaitaistruct.ConsistencyError(u"contents", self.length_sectors * 256, len(self._m_contents))
self._dirty = False
@property
def contents(self):
if self._should_write_contents:
self._write_contents()
if hasattr(self, '_m_contents'):
return self._m_contents
if not self.contents__enabled:
return None
_pos = self._io.pos()
self._io.seek((self.starting_track * 256) * 16 + self.starting_sector * 256)
self._m_contents = self._io.read_bytes(self.length_sectors * 256)
self._io.seek(_pos)
return getattr(self, '_m_contents', None)
@contents.setter
def contents(self, v):
self._dirty = True
self._m_contents = v
def _write_contents(self):
self._should_write_contents = False
_pos = self._io.pos()
self._io.seek((self.starting_track * 256) * 16 + self.starting_sector * 256)
self._io.write_bytes(self._m_contents)
self._io.seek(_pos)
@property
def is_deleted(self):
if hasattr(self, '_m_is_deleted'):
return self._m_is_deleted
self._m_is_deleted = self.name.first_byte == 1
return getattr(self, '_m_is_deleted', None)
def _invalidate_is_deleted(self):
del self._m_is_deleted
@property
def is_terminator(self):
if hasattr(self, '_m_is_terminator'):
return self._m_is_terminator
self._m_is_terminator = self.name.first_byte == 0
return getattr(self, '_m_is_terminator', None)
def _invalidate_is_terminator(self):
del self._m_is_terminator
class Filename(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.Filename, self).__init__(_io)
self._parent = _parent
self._root = _root
self._should_write_first_byte = False
self.first_byte__enabled = True
def _read(self):
self.name = self._io.read_bytes(8)
self._dirty = False
def _fetch_instances(self):
pass
_ = self.first_byte
if hasattr(self, '_m_first_byte'):
pass
def _write__seq(self, io=None):
super(TrDosImage.Filename, self)._write__seq(io)
self._should_write_first_byte = self.first_byte__enabled
self._io.write_bytes(self.name)
def _check(self):
if len(self.name) != 8:
raise kaitaistruct.ConsistencyError(u"name", 8, len(self.name))
if self.first_byte__enabled:
pass
self._dirty = False
@property
def first_byte(self):
if self._should_write_first_byte:
self._write_first_byte()
if hasattr(self, '_m_first_byte'):
return self._m_first_byte
if not self.first_byte__enabled:
return None
_pos = self._io.pos()
self._io.seek(0)
self._m_first_byte = self._io.read_u1()
self._io.seek(_pos)
return getattr(self, '_m_first_byte', None)
@first_byte.setter
def first_byte(self, v):
self._dirty = True
self._m_first_byte = v
def _write_first_byte(self):
self._should_write_first_byte = False
_pos = self._io.pos()
self._io.seek(0)
self._io.write_u1(self._m_first_byte)
self._io.seek(_pos)
class PositionAndLengthBasic(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.PositionAndLengthBasic, self).__init__(_io)
self._parent = _parent
self._root = _root
def _read(self):
self.program_and_data_length = self._io.read_u2le()
self.program_length = self._io.read_u2le()
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(TrDosImage.PositionAndLengthBasic, self)._write__seq(io)
self._io.write_u2le(self.program_and_data_length)
self._io.write_u2le(self.program_length)
def _check(self):
self._dirty = False
class PositionAndLengthCode(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.PositionAndLengthCode, self).__init__(_io)
self._parent = _parent
self._root = _root
def _read(self):
self.start_address = self._io.read_u2le()
self.length = self._io.read_u2le()
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(TrDosImage.PositionAndLengthCode, self)._write__seq(io)
self._io.write_u2le(self.start_address)
self._io.write_u2le(self.length)
def _check(self):
self._dirty = False
class PositionAndLengthGeneric(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.PositionAndLengthGeneric, self).__init__(_io)
self._parent = _parent
self._root = _root
def _read(self):
self.reserved = self._io.read_u2le()
self.length = self._io.read_u2le()
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(TrDosImage.PositionAndLengthGeneric, self)._write__seq(io)
self._io.write_u2le(self.reserved)
self._io.write_u2le(self.length)
def _check(self):
self._dirty = False
class PositionAndLengthPrint(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.PositionAndLengthPrint, self).__init__(_io)
self._parent = _parent
self._root = _root
def _read(self):
self.extent_no = self._io.read_u1()
self.reserved = self._io.read_u1()
self.length = self._io.read_u2le()
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(TrDosImage.PositionAndLengthPrint, self)._write__seq(io)
self._io.write_u1(self.extent_no)
self._io.write_u1(self.reserved)
self._io.write_u2le(self.length)
def _check(self):
self._dirty = False
class VolumeInfo(ReadWriteKaitaiStruct):
def __init__(self, _io=None, _parent=None, _root=None):
super(TrDosImage.VolumeInfo, self).__init__(_io)
self._parent = _parent
self._root = _root
def _read(self):
self.catalog_end = self._io.read_bytes(1)
if not self.catalog_end == b"\x00":
raise kaitaistruct.ValidationNotEqualError(b"\x00", self.catalog_end, self._io, u"/types/volume_info/seq/0")
self.unused = self._io.read_bytes(224)
self.first_free_sector_sector = self._io.read_u1()
self.first_free_sector_track = self._io.read_u1()
self.disk_type = KaitaiStream.resolve_enum(TrDosImage.DiskType, self._io.read_u1())
self.num_files = self._io.read_u1()
self.num_free_sectors = self._io.read_u2le()
self.tr_dos_id = self._io.read_bytes(1)
if not self.tr_dos_id == b"\x10":
raise kaitaistruct.ValidationNotEqualError(b"\x10", self.tr_dos_id, self._io, u"/types/volume_info/seq/7")
self.unused_2 = self._io.read_bytes(2)
self.password = self._io.read_bytes(9)
self.unused_3 = self._io.read_bytes(1)
self.num_deleted_files = self._io.read_u1()
self.label = self._io.read_bytes(8)
self.unused_4 = self._io.read_bytes(3)
self._dirty = False
def _fetch_instances(self):
pass
def _write__seq(self, io=None):
super(TrDosImage.VolumeInfo, self)._write__seq(io)
self._io.write_bytes(self.catalog_end)
self._io.write_bytes(self.unused)
self._io.write_u1(self.first_free_sector_sector)
self._io.write_u1(self.first_free_sector_track)
self._io.write_u1(int(self.disk_type))
self._io.write_u1(self.num_files)
self._io.write_u2le(self.num_free_sectors)
self._io.write_bytes(self.tr_dos_id)
self._io.write_bytes(self.unused_2)
self._io.write_bytes(self.password)
self._io.write_bytes(self.unused_3)
self._io.write_u1(self.num_deleted_files)
self._io.write_bytes(self.label)
self._io.write_bytes(self.unused_4)
def _check(self):
if len(self.catalog_end) != 1:
raise kaitaistruct.ConsistencyError(u"catalog_end", 1, len(self.catalog_end))
if not self.catalog_end == b"\x00":
raise kaitaistruct.ValidationNotEqualError(b"\x00", self.catalog_end, None, u"/types/volume_info/seq/0")
if len(self.unused) != 224:
raise kaitaistruct.ConsistencyError(u"unused", 224, len(self.unused))
if len(self.tr_dos_id) != 1:
raise kaitaistruct.ConsistencyError(u"tr_dos_id", 1, len(self.tr_dos_id))
if not self.tr_dos_id == b"\x10":
raise kaitaistruct.ValidationNotEqualError(b"\x10", self.tr_dos_id, None, u"/types/volume_info/seq/7")
if len(self.unused_2) != 2:
raise kaitaistruct.ConsistencyError(u"unused_2", 2, len(self.unused_2))
if len(self.password) != 9:
raise kaitaistruct.ConsistencyError(u"password", 9, len(self.password))
if len(self.unused_3) != 1:
raise kaitaistruct.ConsistencyError(u"unused_3", 1, len(self.unused_3))
if len(self.label) != 8:
raise kaitaistruct.ConsistencyError(u"label", 8, len(self.label))
if len(self.unused_4) != 3:
raise kaitaistruct.ConsistencyError(u"unused_4", 3, len(self.unused_4))
self._dirty = False
@property
def num_sides(self):
if hasattr(self, '_m_num_sides'):
return self._m_num_sides
self._m_num_sides = (1 if int(self.disk_type) & 8 != 0 else 2)
return getattr(self, '_m_num_sides', None)
def _invalidate_num_sides(self):
del self._m_num_sides
@property
def num_tracks(self):
if hasattr(self, '_m_num_tracks'):
return self._m_num_tracks
self._m_num_tracks = (40 if int(self.disk_type) & 1 != 0 else 80)
return getattr(self, '_m_num_tracks', None)
def _invalidate_num_tracks(self):
del self._m_num_tracks
@property
def volume_info(self):
if self._should_write_volume_info:
self._write_volume_info()
if hasattr(self, '_m_volume_info'):
return self._m_volume_info
if not self.volume_info__enabled:
return None
_pos = self._io.pos()
self._io.seek(2048)
self._m_volume_info = TrDosImage.VolumeInfo(self._io, self, self._root)
self._m_volume_info._read()
self._io.seek(_pos)
return getattr(self, '_m_volume_info', None)
@volume_info.setter
def volume_info(self, v):
self._dirty = True
self._m_volume_info = v
def _write_volume_info(self):
self._should_write_volume_info = False
_pos = self._io.pos()
self._io.seek(2048)
self._m_volume_info._write__seq(self._io)
self._io.seek(_pos)