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File name : zlib_codec.py

Content :""" Python 'zlib_codec' Codec - zlib compression encoding Unlike most of the other codecs which target Unicode, this codec will return Python string objects for both encode and decode. Written by Marc-Andre Lemburg (mal@lemburg.com). """ import codecs import zlib # this codec needs the optional zlib module ! ### Codec APIs def zlib_encode(input,errors='strict'): """ Encodes the object input and returns a tuple (output object, length consumed). errors defines the error handling to apply. It defaults to 'strict' handling which is the only currently supported error handling for this codec. """ assert errors == 'strict' output = zlib.compress(input) return (output, len(input)) def zlib_decode(input,errors='strict'): """ Decodes the object input and returns a tuple (output object, length consumed). input must be an object which provides the bf_getreadbuf buffer slot. Python strings, buffer objects and memory mapped files are examples of objects providing this slot. errors defines the error handling to apply. It defaults to 'strict' handling which is the only currently supported error handling for this codec. """ assert errors == 'strict' output = zlib.decompress(input) return (output, len(input)) class Codec(codecs.Codec): def encode(self, input, errors='strict'): return zlib_encode(input, errors) def decode(self, input, errors='strict'): return zlib_decode(input, errors) class IncrementalEncoder(codecs.IncrementalEncoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.compressobj = zlib.compressobj() def encode(self, input, final=False): if final: c = self.compressobj.compress(input) return c + self.compressobj.flush() else: return self.compressobj.compress(input) def reset(self): self.compressobj = zlib.compressobj() class IncrementalDecoder(codecs.IncrementalDecoder): def __init__(self, errors='strict'): assert errors == 'strict' self.errors = errors self.decompressobj = zlib.decompressobj() def decode(self, input, final=False): if final: c = self.decompressobj.decompress(input) return c + self.decompressobj.flush() else: return self.decompressobj.decompress(input) def reset(self): self.decompressobj = zlib.decompressobj() class StreamWriter(Codec,codecs.StreamWriter): pass class StreamReader(Codec,codecs.StreamReader): pass ### encodings module API def getregentry(): return codecs.CodecInfo( name='zlib', encode=zlib_encode, decode=zlib_decode, incrementalencoder=IncrementalEncoder, incrementaldecoder=IncrementalDecoder, streamreader=StreamReader, streamwriter=StreamWriter, )

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