311     def buffer(sliceable, offset=0, length=None):

   311     def buffer(sliceable, offset=0, length=None):

   312         if length is not None:

   312         if length is not None:

   313             return memoryview(sliceable)[offset:offset + length]

   313             return memoryview(sliceable)[offset:offset + length]

   314         return memoryview(sliceable)[offset:]

   314         return memoryview(sliceable)[offset:]

   315 

   315 

   317 

   317 

   318 _chunksize = 4096

   318 _chunksize = 4096

   319 

   319 

   320 class bufferedinputpipe(object):

   320 class bufferedinputpipe(object):

   321     """a manually buffered input pipe

   321     """a manually buffered input pipe