diff options
Diffstat (limited to 'FuseArchive/ChunkBufferMem.py')
-rw-r--r-- | FuseArchive/ChunkBufferMem.py | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/FuseArchive/ChunkBufferMem.py b/FuseArchive/ChunkBufferMem.py new file mode 100644 index 0000000..e1599be --- /dev/null +++ b/FuseArchive/ChunkBufferMem.py @@ -0,0 +1,37 @@ +import logging + +# Handle efficient operations on a non-fixed length buffer like appending, +# replacing, reading chunks, etc +class ChunkBufferMem: + def __init__( self, data = '' ): + logging.debug( "Creating chunkbuffer: %s" % data ) + self.l = len( data ) + self.chunk = [ data ] + + def append( self, s ): + self.l += len( s ) + self.chunk.append( s ) + + # Note: replace doesn't effect length so we don't update it + def replace( self, buf, start, end ): + # We make a string of our chunk, then create a new list of the 3 + # strings, the start, new chunk, and remaining chunk + s = ''.join( self.chunk ) + l = end - start + self.chunk = [ s[ :start ], buf[ :l ], s[ end: ] ] + + def length( self ): + return self.l + + def truncate( self, l ): + s = ''.join( self.chunk ) + self.l = l + self.chunk = [ s[ :l ] ] + + def _simplify( self ): + logging.debug( "Simplify!" ) + self.chunk = [ ''.join( self.chunk ) ] + + def string(self): + logging.debug( "Stringifying: %s" % self.chunk ) + return ''.join( self.chunk ) |