"""Python 'bz2_codec' Codec - bz2 compression encoding.

This codec de/encodes from bytes to bytes and is therefore usable with
bytes.transform() and bytes.untransform().

Adapted by Raymond Hettinger from zlib_codec.py which was written
by Marc-Andre Lemburg (mal@lemburg.com).
"""

import codecs
import 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,
 )