"""Python 'hex_codec' Codec - 2-digit hex content transfer encoding.

This codec de/encodes from bytes to bytes.

Written by Marc-Andre Lemburg (mal@lemburg.com).
"""

import codecs
import binascii

### Codec APIs

def hex_encode(input, errors='strict'):
 assert errors == 'strict'
 return (binascii.b2a_hex(input), len(input))

def hex_decode(input, errors='strict'):
 assert errors == 'strict'
 return (binascii.a2b_hex(input), len(input))

class Codec(codecs.Codec):
 def encode(self, input, errors='strict'):
 return hex_encode(input, errors)
 def decode(self, input, errors='strict'):
 return hex_decode(input, errors)

class IncrementalEncoder(codecs.IncrementalEncoder):
 def encode(self, input, final=False):
 assert self.errors == 'strict'
 return binascii.b2a_hex(input)

class IncrementalDecoder(codecs.IncrementalDecoder):
 def decode(self, input, final=False):
 assert self.errors == 'strict'
 return binascii.a2b_hex(input)

class StreamWriter(Codec, codecs.StreamWriter):
 charbuffertype = bytes

class StreamReader(Codec, codecs.StreamReader):
 charbuffertype = bytes

### encodings module API

def getregentry():
 return codecs.CodecInfo(
 name='hex',
 encode=hex_encode,
 decode=hex_decode,
 incrementalencoder=IncrementalEncoder,
 incrementaldecoder=IncrementalDecoder,
 streamwriter=StreamWriter,
 streamreader=StreamReader,
 _is_text_encoding=False,
 )