104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
""" Python 'utf-16' Codec
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Written by Marc-Andre Lemburg (mal@lemburg.com).
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(c) Copyright CNRI, All Rights Reserved. NO WARRANTY.
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"""
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import codecs, sys
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### Codec APIs
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encode = codecs.utf_16_encode
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def decode(input, errors='strict'):
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return codecs.utf_16_decode(input, errors, True)
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class IncrementalEncoder(codecs.IncrementalEncoder):
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def __init__(self, errors='strict'):
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codecs.IncrementalEncoder.__init__(self, errors)
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self.encoder = None
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def encode(self, input, final=False):
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if self.encoder is None:
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result = codecs.utf_16_encode(input, self.errors)[0]
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if sys.byteorder == 'little':
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self.encoder = codecs.utf_16_le_encode
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else:
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self.encoder = codecs.utf_16_be_encode
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return result
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return self.encoder(input, self.errors)[0]
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def reset(self):
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codecs.IncrementalEncoder.reset(self)
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self.encoder = None
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class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
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def __init__(self, errors='strict'):
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codecs.BufferedIncrementalDecoder.__init__(self, errors)
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self.decoder = None
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def _buffer_decode(self, input, errors, final):
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if self.decoder is None:
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(output, consumed, byteorder) = \
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codecs.utf_16_ex_decode(input, errors, 0, final)
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if byteorder == -1:
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self.decoder = codecs.utf_16_le_decode
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elif byteorder == 1:
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self.decoder = codecs.utf_16_be_decode
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elif consumed >= 2:
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raise UnicodeError("UTF-16 stream does not start with BOM")
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return (output, consumed)
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return self.decoder(input, self.errors, final)
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def reset(self):
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codecs.BufferedIncrementalDecoder.reset(self)
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self.decoder = None
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class StreamWriter(codecs.StreamWriter):
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def __init__(self, stream, errors='strict'):
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self.bom_written = False
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codecs.StreamWriter.__init__(self, stream, errors)
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def encode(self, input, errors='strict'):
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self.bom_written = True
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result = codecs.utf_16_encode(input, errors)
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if sys.byteorder == 'little':
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self.encode = codecs.utf_16_le_encode
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else:
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self.encode = codecs.utf_16_be_encode
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return result
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class StreamReader(codecs.StreamReader):
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def reset(self):
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codecs.StreamReader.reset(self)
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try:
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del self.decode
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except AttributeError:
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pass
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def decode(self, input, errors='strict'):
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(object, consumed, byteorder) = \
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codecs.utf_16_ex_decode(input, errors, 0, False)
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if byteorder == -1:
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self.decode = codecs.utf_16_le_decode
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elif byteorder == 1:
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self.decode = codecs.utf_16_be_decode
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elif consumed>=2:
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raise UnicodeError,"UTF-16 stream does not start with BOM"
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return (object, consumed)
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### encodings module API
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def getregentry():
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return codecs.CodecInfo(
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name='utf-16',
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encode=encode,
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decode=decode,
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incrementalencoder=IncrementalEncoder,
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incrementaldecoder=IncrementalDecoder,
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streamreader=StreamReader,
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streamwriter=StreamWriter,
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)
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