def __init__(self, name, raise_if=ErrorDefect, lazy=False):
super(CfbIO, self).__init__(name, mode='rb')
MaybeDefected.__init__(self, raise_if=raise_if)
self.size = fstat(self.fileno()).st_size
self.header = Header(self)
self.directory = Directory(self)
if not lazy:
self.directory.read()
def __init__(self, name, raise_if=ErrorDefect, lazy=False):
super(CfbIO, self).__init__(name, mode='rb')
MaybeDefected.__init__(self, raise_if=raise_if)
self.size = fstat(self.fileno()).st_size
self.header = Header(self)
self.directory = Directory(self)
if not lazy:
self.directory.read()
class CfbIO(FileIO, MaybeDefected, ByteHelpers):
"""
Creates IO (currently read-only) object for accessing internal structure
of Microsoft Compound File Binary Format Files.
"""
# pylint: disable=R0904
def __init__(self, name, raise_if=ErrorDefect, lazy=False):
super(CfbIO, self).__init__(name, mode='rb')
MaybeDefected.__init__(self, raise_if=raise_if)
self.size = fstat(self.fileno()).st_size
self.header = Header(self)
self.directory = Directory(self)
if not lazy:
self.directory.read()
def __del__(self):
self.close()
@cached
def root(self):
""" Property provides access to root object in CFB. """
sector = self.header.directory_sector_start
position = (sector + 1) << self.header.sector_shift
return RootEntry(self, position)
def next_fat(self, current):
"""
Helper gives you seekable position of next FAT sector. Should not be
called from external code.
"""
sector_size = self.header.sector_size // 4
block = current // sector_size
difat_position = 76
if block >= 109:
block -= 109
sector = self.header.difat_sector_start
while block >= sector_size:
position = (sector + 1) << self.header.sector_shift
position += self.header.sector_size - 4
sector = self.get_long(position)
block -= sector_size - 1
difat_position = (sector + 1) << self.header.sector_shift
fat_sector = self.get_long(difat_position + block * 4)
fat_position = (fat_sector + 1) << self.header.sector_shift
fat_position += (current % sector_size) * 4
return self.get_long(fat_position)
def next_minifat(self, current):
"""
Helpers provides access to next mini-FAT sector and returns it's
seekable position. Should not be called from external code.
"""
position = 0
sector_size = self.header.sector_size // 4
sector = self.header.minifat_sector_start
while sector != ENDOFCHAIN and (position + 1) * sector_size <= current:
sector = self.next_fat(sector)
position += 1
if sector == ENDOFCHAIN:
return ENDOFCHAIN
minifat_position = (sector + 1) << self.header.sector_shift
minifat_position += (current - position * sector_size) * 4
return self.get_long(minifat_position)
def __getitem__(self, item):
""" You can access Directory Entries by ID (integer) or by name """
if isinstance(item, string_types):
return self.directory.by_name(item)
return self.directory[item]
def __len__(self):
return len(self.directory)
def __repr__(self):
return '<%s "%s">' % (self.__class__.__name__, self.name)
class CfbIO(FileIO, MaybeDefected, ByteHelpers):
"""
Creates IO (currently read-only) object for accessing internal structure
of Microsoft Compound File Binary Format Files.
"""
# pylint: disable=R0904
def __init__(self, name, raise_if=ErrorDefect, lazy=False):
super(CfbIO, self).__init__(name, mode='rb')
MaybeDefected.__init__(self, raise_if=raise_if)
self.size = fstat(self.fileno()).st_size
self.header = Header(self)
self.directory = Directory(self)
if not lazy:
self.directory.read()
def __del__(self):
self.close()
@cached
def root(self):
""" Property provides access to root object in CFB. """
sector = self.header.directory_sector_start
position = (sector + 1) << self.header.sector_shift
return RootEntry(self, position)
def next_fat(self, current):
"""
Helper gives you seekable position of next FAT sector. Should not be
called from external code.
"""
sector_size = self.header.sector_size // 4
block = current // sector_size
difat_position = 76
if block >= 109:
block -= 109
sector = self.header.difat_sector_start
while block >= sector_size:
position = (sector + 1) << self.header.sector_shift
position += self.header.sector_size - 4
sector = self.get_long(position)
block -= sector_size - 1
difat_position = (sector + 1) << self.header.sector_shift
fat_sector = self.get_long(difat_position + block * 4)
fat_position = (fat_sector + 1) << self.header.sector_shift
fat_position += (current % sector_size) * 4
return self.get_long(fat_position)
def next_minifat(self, current):
"""
Helpers provides access to next mini-FAT sector and returns it's
seekable position. Should not be called from external code.
"""
position = 0
sector_size = self.header.sector_size // 4
sector = self.header.minifat_sector_start
while sector != ENDOFCHAIN and (position + 1) * sector_size <= current:
sector = self.next_fat(sector)
position += 1
if sector == ENDOFCHAIN:
return ENDOFCHAIN
minifat_position = (sector + 1) << self.header.sector_shift
minifat_position += (current - position * sector_size) * 4
return self.get_long(minifat_position)
def __getitem__(self, item):
""" You can access Directory Entries by ID (integer) or by name """
if isinstance(item, string_types):
return self.directory.by_name(item)
return self.directory[item]
def __len__(self):
return len(self.directory)
def __repr__(self):
return '<%s "%s">' % (self.__class__.__name__, self.name)
