/usr/lib/python2.7/dist-packages/mutagen/asf/_attrs.py is in python-mutagen 1.36-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Copyright (C) 2005-2006 Joe Wreschnig
# Copyright (C) 2006-2007 Lukas Lalinsky
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
import sys
import struct
from mutagen._compat import swap_to_string, text_type, PY2, reraise
from mutagen._util import total_ordering
from ._util import ASFError
class ASFBaseAttribute(object):
"""Generic attribute."""
TYPE = None
_TYPES = {}
value = None
"""The Python value of this attribute (type depends on the class)"""
language = None
"""Language"""
stream = None
"""Stream"""
def __init__(self, value=None, data=None, language=None,
stream=None, **kwargs):
self.language = language
self.stream = stream
if data:
self.value = self.parse(data, **kwargs)
else:
if value is None:
# we used to support not passing any args and instead assign
# them later, keep that working..
self.value = None
else:
self.value = self._validate(value)
@classmethod
def _register(cls, other):
cls._TYPES[other.TYPE] = other
return other
@classmethod
def _get_type(cls, type_):
"""Raises KeyError"""
return cls._TYPES[type_]
def _validate(self, value):
"""Raises TypeError or ValueError in case the user supplied value
isn't valid.
"""
return value
def data_size(self):
raise NotImplementedError
def __repr__(self):
name = "%s(%r" % (type(self).__name__, self.value)
if self.language:
name += ", language=%d" % self.language
if self.stream:
name += ", stream=%d" % self.stream
name += ")"
return name
def render(self, name):
name = name.encode("utf-16-le") + b"\x00\x00"
data = self._render()
return (struct.pack("<H", len(name)) + name +
struct.pack("<HH", self.TYPE, len(data)) + data)
def render_m(self, name):
name = name.encode("utf-16-le") + b"\x00\x00"
if self.TYPE == 2:
data = self._render(dword=False)
else:
data = self._render()
return (struct.pack("<HHHHI", 0, self.stream or 0, len(name),
self.TYPE, len(data)) + name + data)
def render_ml(self, name):
name = name.encode("utf-16-le") + b"\x00\x00"
if self.TYPE == 2:
data = self._render(dword=False)
else:
data = self._render()
return (struct.pack("<HHHHI", self.language or 0, self.stream or 0,
len(name), self.TYPE, len(data)) + name + data)
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFUnicodeAttribute(ASFBaseAttribute):
"""Unicode string attribute.
::
ASFUnicodeAttribute(u'some text')
"""
TYPE = 0x0000
def parse(self, data):
try:
return data.decode("utf-16-le").strip("\x00")
except UnicodeDecodeError as e:
reraise(ASFError, e, sys.exc_info()[2])
def _validate(self, value):
if not isinstance(value, text_type):
if PY2:
return value.decode("utf-8")
else:
raise TypeError("%r not str" % value)
return value
def _render(self):
return self.value.encode("utf-16-le") + b"\x00\x00"
def data_size(self):
return len(self._render())
def __bytes__(self):
return self.value.encode("utf-16-le")
def __str__(self):
return self.value
def __eq__(self, other):
return text_type(self) == other
def __lt__(self, other):
return text_type(self) < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFByteArrayAttribute(ASFBaseAttribute):
"""Byte array attribute.
::
ASFByteArrayAttribute(b'1234')
"""
TYPE = 0x0001
def parse(self, data):
assert isinstance(data, bytes)
return data
def _render(self):
assert isinstance(self.value, bytes)
return self.value
def _validate(self, value):
if not isinstance(value, bytes):
raise TypeError("must be bytes/str: %r" % value)
return value
def data_size(self):
return len(self.value)
def __bytes__(self):
return self.value
def __str__(self):
return "[binary data (%d bytes)]" % len(self.value)
def __eq__(self, other):
return self.value == other
def __lt__(self, other):
return self.value < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFBoolAttribute(ASFBaseAttribute):
"""Bool attribute.
::
ASFBoolAttribute(True)
"""
TYPE = 0x0002
def parse(self, data, dword=True):
if dword:
return struct.unpack("<I", data)[0] == 1
else:
return struct.unpack("<H", data)[0] == 1
def _render(self, dword=True):
if dword:
return struct.pack("<I", bool(self.value))
else:
return struct.pack("<H", bool(self.value))
def _validate(self, value):
return bool(value)
def data_size(self):
return 4
def __bool__(self):
return bool(self.value)
def __bytes__(self):
return text_type(self.value).encode('utf-8')
def __str__(self):
return text_type(self.value)
def __eq__(self, other):
return bool(self.value) == other
def __lt__(self, other):
return bool(self.value) < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFDWordAttribute(ASFBaseAttribute):
"""DWORD attribute.
::
ASFDWordAttribute(42)
"""
TYPE = 0x0003
def parse(self, data):
return struct.unpack("<L", data)[0]
def _render(self):
return struct.pack("<L", self.value)
def _validate(self, value):
value = int(value)
if not 0 <= value <= 2 ** 32 - 1:
raise ValueError("Out of range")
return value
def data_size(self):
return 4
def __int__(self):
return self.value
def __bytes__(self):
return text_type(self.value).encode('utf-8')
def __str__(self):
return text_type(self.value)
def __eq__(self, other):
return int(self.value) == other
def __lt__(self, other):
return int(self.value) < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFQWordAttribute(ASFBaseAttribute):
"""QWORD attribute.
::
ASFQWordAttribute(42)
"""
TYPE = 0x0004
def parse(self, data):
return struct.unpack("<Q", data)[0]
def _render(self):
return struct.pack("<Q", self.value)
def _validate(self, value):
value = int(value)
if not 0 <= value <= 2 ** 64 - 1:
raise ValueError("Out of range")
return value
def data_size(self):
return 8
def __int__(self):
return self.value
def __bytes__(self):
return text_type(self.value).encode('utf-8')
def __str__(self):
return text_type(self.value)
def __eq__(self, other):
return int(self.value) == other
def __lt__(self, other):
return int(self.value) < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFWordAttribute(ASFBaseAttribute):
"""WORD attribute.
::
ASFWordAttribute(42)
"""
TYPE = 0x0005
def parse(self, data):
return struct.unpack("<H", data)[0]
def _render(self):
return struct.pack("<H", self.value)
def _validate(self, value):
value = int(value)
if not 0 <= value <= 2 ** 16 - 1:
raise ValueError("Out of range")
return value
def data_size(self):
return 2
def __int__(self):
return self.value
def __bytes__(self):
return text_type(self.value).encode('utf-8')
def __str__(self):
return text_type(self.value)
def __eq__(self, other):
return int(self.value) == other
def __lt__(self, other):
return int(self.value) < other
__hash__ = ASFBaseAttribute.__hash__
@ASFBaseAttribute._register
@swap_to_string
@total_ordering
class ASFGUIDAttribute(ASFBaseAttribute):
"""GUID attribute."""
TYPE = 0x0006
def parse(self, data):
assert isinstance(data, bytes)
return data
def _render(self):
assert isinstance(self.value, bytes)
return self.value
def _validate(self, value):
if not isinstance(value, bytes):
raise TypeError("must be bytes/str: %r" % value)
return value
def data_size(self):
return len(self.value)
def __bytes__(self):
return self.value
def __str__(self):
return repr(self.value)
def __eq__(self, other):
return self.value == other
def __lt__(self, other):
return self.value < other
__hash__ = ASFBaseAttribute.__hash__
def ASFValue(value, kind, **kwargs):
"""Create a tag value of a specific kind.
::
ASFValue(u"My Value", UNICODE)
:rtype: ASFBaseAttribute
:raises TypeError: in case a wrong type was passed
:raises ValueError: in case the value can't be be represented as ASFValue.
"""
try:
attr_type = ASFBaseAttribute._get_type(kind)
except KeyError:
raise ValueError("Unknown value type %r" % kind)
else:
return attr_type(value=value, **kwargs)
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