symbian-qemu-0.9.1-12/python-win32-2.6.1/lib/encodings/utf_32.py
author Mike Kinghan <mikek@symbian.org>
Thu, 25 Nov 2010 14:08:02 +0000
branchGCC_SURGE
changeset 133 bdd30170987b
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Provide an option for the base/rom extension that causes the toolchain id (ARMCC or GCCE) to be defined for the C preprocessor phase of rombuild, enabling rom files to be conditionally included or excluded depending on whether the toolchain can build them. This mimics the same change for Beagleboard.

"""
Python 'utf-32' Codec
"""
import codecs, sys

### Codec APIs

encode = codecs.utf_32_encode

def decode(input, errors='strict'):
    return codecs.utf_32_decode(input, errors, True)

class IncrementalEncoder(codecs.IncrementalEncoder):
    def __init__(self, errors='strict'):
        codecs.IncrementalEncoder.__init__(self, errors)
        self.encoder = None

    def encode(self, input, final=False):
        if self.encoder is None:
            result = codecs.utf_32_encode(input, self.errors)[0]
            if sys.byteorder == 'little':
                self.encoder = codecs.utf_32_le_encode
            else:
                self.encoder = codecs.utf_32_be_encode
            return result
        return self.encoder(input, self.errors)[0]

    def reset(self):
        codecs.IncrementalEncoder.reset(self)
        self.encoder = None

    def getstate(self):
        # state info we return to the caller:
        # 0: stream is in natural order for this platform
        # 2: endianness hasn't been determined yet
        # (we're never writing in unnatural order)
        return (2 if self.encoder is None else 0)

    def setstate(self, state):
        if state:
            self.encoder = None
        else:
            if sys.byteorder == 'little':
                self.encoder = codecs.utf_32_le_encode
            else:
                self.encoder = codecs.utf_32_be_encode

class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
    def __init__(self, errors='strict'):
        codecs.BufferedIncrementalDecoder.__init__(self, errors)
        self.decoder = None

    def _buffer_decode(self, input, errors, final):
        if self.decoder is None:
            (output, consumed, byteorder) = \
                codecs.utf_32_ex_decode(input, errors, 0, final)
            if byteorder == -1:
                self.decoder = codecs.utf_32_le_decode
            elif byteorder == 1:
                self.decoder = codecs.utf_32_be_decode
            elif consumed >= 4:
                raise UnicodeError("UTF-32 stream does not start with BOM")
            return (output, consumed)
        return self.decoder(input, self.errors, final)

    def reset(self):
        codecs.BufferedIncrementalDecoder.reset(self)
        self.decoder = None

    def getstate(self):
        # additonal state info from the base class must be None here,
        # as it isn't passed along to the caller
        state = codecs.BufferedIncrementalDecoder.getstate(self)[0]
        # additional state info we pass to the caller:
        # 0: stream is in natural order for this platform
        # 1: stream is in unnatural order
        # 2: endianness hasn't been determined yet
        if self.decoder is None:
            return (state, 2)
        addstate = int((sys.byteorder == "big") !=
                       (self.decoder is codecs.utf_32_be_decode))
        return (state, addstate)

    def setstate(self, state):
        # state[1] will be ignored by BufferedIncrementalDecoder.setstate()
        codecs.BufferedIncrementalDecoder.setstate(self, state)
        state = state[1]
        if state == 0:
            self.decoder = (codecs.utf_32_be_decode
                            if sys.byteorder == "big"
                            else codecs.utf_32_le_decode)
        elif state == 1:
            self.decoder = (codecs.utf_32_le_decode
                            if sys.byteorder == "big"
                            else codecs.utf_32_be_decode)
        else:
            self.decoder = None

class StreamWriter(codecs.StreamWriter):
    def __init__(self, stream, errors='strict'):
        self.bom_written = False
        codecs.StreamWriter.__init__(self, stream, errors)

    def encode(self, input, errors='strict'):
        self.bom_written = True
        result = codecs.utf_32_encode(input, errors)
        if sys.byteorder == 'little':
            self.encode = codecs.utf_32_le_encode
        else:
            self.encode = codecs.utf_32_be_encode
        return result

class StreamReader(codecs.StreamReader):

    def reset(self):
        codecs.StreamReader.reset(self)
        try:
            del self.decode
        except AttributeError:
            pass

    def decode(self, input, errors='strict'):
        (object, consumed, byteorder) = \
            codecs.utf_32_ex_decode(input, errors, 0, False)
        if byteorder == -1:
            self.decode = codecs.utf_32_le_decode
        elif byteorder == 1:
            self.decode = codecs.utf_32_be_decode
        elif consumed>=4:
            raise UnicodeError,"UTF-32 stream does not start with BOM"
        return (object, consumed)

### encodings module API

def getregentry():
    return codecs.CodecInfo(
        name='utf-32',
        encode=encode,
        decode=decode,
        incrementalencoder=IncrementalEncoder,
        incrementaldecoder=IncrementalDecoder,
        streamreader=StreamReader,
        streamwriter=StreamWriter,
    )