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bz2_codec.py2.2 KB · 79 lines
"""Python 'bz2_codec' Codec - bz2 compression encoding. This codec de/encodes from bytes to bytes and is therefore usable withbytes.transform() and bytes.untransform(). Adapted by Raymond Hettinger from zlib_codec.py which was writtenby Marc-Andre Lemburg (mal@lemburg.com).""" import codecsimport bz2 # this codec needs the optional bz2 module ! ### Codec APIs def bz2_encode(input, errors='strict'):    assert errors == 'strict'    return (bz2.compress(input), len(input)) def bz2_decode(input, errors='strict'):    assert errors == 'strict'    return (bz2.decompress(input), len(input)) class Codec(codecs.Codec):    def encode(self, input, errors='strict'):        return bz2_encode(input, errors)    def decode(self, input, errors='strict'):        return bz2_decode(input, errors) class IncrementalEncoder(codecs.IncrementalEncoder):    def __init__(self, errors='strict'):        assert errors == 'strict'        self.errors = errors        self.compressobj = bz2.BZ2Compressor()     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 = bz2.BZ2Compressor() class IncrementalDecoder(codecs.IncrementalDecoder):    def __init__(self, errors='strict'):        assert errors == 'strict'        self.errors = errors        self.decompressobj = bz2.BZ2Decompressor()     def decode(self, input, final=False):        try:            return self.decompressobj.decompress(input)        except EOFError:            return ''     def reset(self):        self.decompressobj = bz2.BZ2Decompressor() class StreamWriter(Codec, codecs.StreamWriter):    charbuffertype = bytes class StreamReader(Codec, codecs.StreamReader):    charbuffertype = bytes ### encodings module API def getregentry():    return codecs.CodecInfo(        name="bz2",        encode=bz2_encode,        decode=bz2_decode,        incrementalencoder=IncrementalEncoder,        incrementaldecoder=IncrementalDecoder,        streamwriter=StreamWriter,        streamreader=StreamReader,        _is_text_encoding=False,    )