def read(self, length=-1):
blockPos = self.position & self._container.BLOCK_MASK
offset = 0
if length < 0:
length = self.length - self.position
if self.position + length > self.length:
length = self.length - self.position
if not length:
return ''
buffer = allocateBuffer(int(length))
while blockPos + length >= self._container.BLOCK_LEN:
blockLen = self._container.BLOCK_LEN - blockPos
data = self._block.read(blockLen)
buffer[offset:offset + blockLen] = data
length -= blockLen
offset += blockLen
self.position += blockLen
self._block.seek(self.position)
blockPos = 0
if length > 0:
buffer[offset:offset + length] = self._block.read(length)
self.position += length
offset += length
return buffer[0:offset]
def read(self, length=-1):
blockPos = self.position & self._container.BLOCK_MASK
offset = 0
if length < 0:
length = self.length - self.position
if self.position + length > self.length:
length = self.length - self.position
if not length:
return ''
buffer = allocateBuffer(int(length))
while blockPos + length >= self._container.BLOCK_LEN:
blockLen = self._container.BLOCK_LEN - blockPos
data = self._block.read(blockLen)
buffer[offset:offset+blockLen] = data
length -= blockLen
offset += blockLen
self.position += blockLen
self._block.seek(self.position)
blockPos = 0
if length > 0:
buffer[offset:offset+length] = self._block.read(length)
self.position += length
offset += length
return buffer[0:offset]
def seek(self, position, write=False):
position = int(position)
key = pack('>16sii', self._key[0:16], 0,
position >> self._container.BLOCK_SHIFT)
if self._data is None or key != self._key:
self._key = key
container = self._container
data = container.get(self._key, container._blocks)
if data is not None:
self._len = len(data)
if write:
self._data = allocateBuffer(self._container.BLOCK_LEN)
self._data[0:self._len] = data
else:
self._data = buffer(data)
else:
self._data = allocateBuffer(self._container.BLOCK_LEN)
self._position = position & self._container.BLOCK_MASK
def seek(self, position, write=False):
position = int(position)
key = pack('>16sii', self._key[0:16], 0,
position >> self._container.BLOCK_SHIFT)
if self._data is None or key != self._key:
self._key = key
container = self._container
data = container.get(self._key, container._blocks)
if data is not None:
self._len = len(data)
if write:
self._data = allocateBuffer(self._container.BLOCK_LEN)
self._data[0:self._len] = data
else:
self._data = buffer(data)
else:
self._data = allocateBuffer(self._container.BLOCK_LEN)
self._position = position & self._container.BLOCK_MASK
