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1 """Python 'hex_codec' Codec - 2-digit hex content transfer encoding.
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2
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3 This codec de/encodes from bytes to bytes.
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4
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5 Written by Marc-Andre Lemburg (mal@lemburg.com).
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6 """
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7
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8 import codecs
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9 import binascii
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10
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11 ### Codec APIs
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12
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13 def hex_encode(input, errors='strict'):
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14 assert errors == 'strict'
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15 return (binascii.b2a_hex(input), len(input))
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16
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17 def hex_decode(input, errors='strict'):
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18 assert errors == 'strict'
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19 return (binascii.a2b_hex(input), len(input))
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20
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21 class Codec(codecs.Codec):
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22 def encode(self, input, errors='strict'):
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23 return hex_encode(input, errors)
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24 def decode(self, input, errors='strict'):
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25 return hex_decode(input, errors)
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26
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27 class IncrementalEncoder(codecs.IncrementalEncoder):
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28 def encode(self, input, final=False):
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29 assert self.errors == 'strict'
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30 return binascii.b2a_hex(input)
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31
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32 class IncrementalDecoder(codecs.IncrementalDecoder):
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33 def decode(self, input, final=False):
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34 assert self.errors == 'strict'
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35 return binascii.a2b_hex(input)
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36
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37 class StreamWriter(Codec, codecs.StreamWriter):
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38 charbuffertype = bytes
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39
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40 class StreamReader(Codec, codecs.StreamReader):
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41 charbuffertype = bytes
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42
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43 ### encodings module API
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44
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45 def getregentry():
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46 return codecs.CodecInfo(
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47 name='hex',
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48 encode=hex_encode,
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49 decode=hex_decode,
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50 incrementalencoder=IncrementalEncoder,
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51 incrementaldecoder=IncrementalDecoder,
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52 streamwriter=StreamWriter,
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53 streamreader=StreamReader,
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54 _is_text_encoding=False,
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55 )
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