import logging from cStringIO import StringIO # Handle efficient operations on a non-fixed length buffer like appending, # replacing, reading chunks, etc class ChunkBufferStringIO: def __init__( self, data = '' ): logging.debug( "Creating chunkbuffer: %s" % data ) self.io = StringIO(); self.len = 0 self.append( data ) def append( self, s ): self.len += len( s ) self.io.write( s ) def replace( self, buf, start, end ): self.io.seek( start ) self.io.write( buf[ end - start: ] ) self.io.seek( 0, os.SEEK_END ) def length( self ): return self.len def truncate( self, l ): self.len = l self.io.truncate( l ) def string(self): return self.io.getvalue()