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

This codec de/encodes from bytes to bytes.

Written by Marc-Andre Lemburg ([email protected]).
"""

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,
)