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Text File  |  2006-03-23  |  3KB  |  105 lines
  1. """ Python 'utf-16' Codec
  2.  
  3.  
  4. Written by Marc-Andre Lemburg (mal@lemburg.com).
  5.  
  6. (c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
  7.  
  8. """
  9. import codecs, sys
  10.  
  11. ### Codec APIs
  12.  
  13. encode = codecs.utf_16_encode
  14.  
  15. def decode(input, errors='strict'):
  16.     return codecs.utf_16_decode(input, errors, True)
  17.  
  18. class IncrementalEncoder(codecs.IncrementalEncoder):
  19.     def __init__(self, errors='strict'):
  20.         codecs.IncrementalEncoder.__init__(self, errors)
  21.         self.encoder = None
  22.  
  23.     def encode(self, input, final=False):
  24.         if self.encoder is None:
  25.             result = codecs.utf_16_encode(input, self.errors)[0]
  26.             if sys.byteorder == 'little':
  27.                 self.encoder = codecs.utf_16_le_encode
  28.             else:
  29.                 self.encoder = codecs.utf_16_be_encode
  30.             return result
  31.         return self.encoder(input, self.errors)[0]
  32.  
  33.     def reset(self):
  34.         codecs.IncrementalEncoder.reset(self)
  35.         self.encoder = None
  36.  
  37. class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
  38.     def __init__(self, errors='strict'):
  39.         codecs.BufferedIncrementalDecoder.__init__(self, errors)
  40.         self.decoder = None
  41.  
  42.     def _buffer_decode(self, input, errors, final):
  43.         if self.decoder is None:
  44.             (output, consumed, byteorder) = \
  45.                 codecs.utf_16_ex_decode(input, errors, 0, final)
  46.             if byteorder == -1:
  47.                 self.decoder = codecs.utf_16_le_decode
  48.             elif byteorder == 1:
  49.                 self.decoder = codecs.utf_16_be_decode
  50.             elif consumed >= 2:
  51.                 raise UnicodeError("UTF-16 stream does not start with BOM")
  52.             return (output, consumed)
  53.         return self.decoder(input, self.errors, final)
  54.  
  55.     def reset(self):
  56.         codecs.BufferedIncrementalDecoder.reset(self)
  57.         self.decoder = None
  58.  
  59. class StreamWriter(codecs.StreamWriter):
  60.     def __init__(self, stream, errors='strict'):
  61.         self.bom_written = False
  62.         codecs.StreamWriter.__init__(self, stream, errors)
  63.  
  64.     def encode(self, input, errors='strict'):
  65.         self.bom_written = True
  66.         result = codecs.utf_16_encode(input, errors)
  67.         if sys.byteorder == 'little':
  68.             self.encode = codecs.utf_16_le_encode
  69.         else:
  70.             self.encode = codecs.utf_16_be_encode
  71.         return result
  72.  
  73. class StreamReader(codecs.StreamReader):
  74.  
  75.     def reset(self):
  76.         codecs.StreamReader.reset(self)
  77.         try:
  78.             del self.decode
  79.         except AttributeError:
  80.             pass
  81.  
  82.     def decode(self, input, errors='strict'):
  83.         (object, consumed, byteorder) = \
  84.             codecs.utf_16_ex_decode(input, errors, 0, False)
  85.         if byteorder == -1:
  86.             self.decode = codecs.utf_16_le_decode
  87.         elif byteorder == 1:
  88.             self.decode = codecs.utf_16_be_decode
  89.         elif consumed>=2:
  90.             raise UnicodeError,"UTF-16 stream does not start with BOM"
  91.         return (object, consumed)
  92.  
  93. ### encodings module API
  94.  
  95. def getregentry():
  96.     return codecs.CodecInfo(
  97.         name='utf-16',
  98.         encode=encode,
  99.         decode=decode,
  100.         incrementalencoder=IncrementalEncoder,
  101.         incrementaldecoder=IncrementalDecoder,
  102.         streamreader=StreamReader,
  103.         streamwriter=StreamWriter,
  104.     )
  105.