text: #
  # test_multibytecodec.py
  #   Unit test for multibytecodec itself
  #
  
  from test import support
  from test.support import TESTFN
  import unittest, io, codecs, sys
  import _multibytecodec
  
  ALL_CJKENCODINGS = [
  # _codecs_cn
      'gb2312', 'gbk', 'gb18030', 'hz',
  # _codecs_hk
      'big5hkscs',
  # _codecs_jp
      'cp932', 'shift_jis', 'euc_jp', 'euc_jisx0213', 'shift_jisx0213',
      'euc_jis_2004', 'shift_jis_2004',
  # _codecs_kr
      'cp949', 'euc_kr', 'johab',
  # _codecs_tw
      'big5', 'cp950',
  # _codecs_iso2022
      'iso2022_jp', 'iso2022_jp_1', 'iso2022_jp_2', 'iso2022_jp_2004',
      'iso2022_jp_3', 'iso2022_jp_ext', 'iso2022_kr',
  ]
  
  class Test_MultibyteCodec(unittest.TestCase):
  
      def test_nullcoding(self):
          for enc in ALL_CJKENCODINGS:
              self.assertEqual(b''.decode(enc), '')
              self.assertEqual(str(b'', enc), '')
              self.assertEqual(''.encode(enc), b'')
  
      def test_str_decode(self):
          for enc in ALL_CJKENCODINGS:
              self.assertEqual('abcd'.encode(enc), b'abcd')
  
      def test_errorcallback_longindex(self):
          dec = codecs.getdecoder('euc-kr')
          myreplace  = lambda exc: ('', sys.maxsize+1)
          codecs.register_error('test.cjktest', myreplace)
          self.assertRaises(IndexError, dec,
                            b'apple\x92ham\x93spam', 'test.cjktest')
  
      def test_errorcallback_custom_ignore(self):
          # Issue #23215: MemoryError with custom error handlers and multibyte codecs
          data = 100 * "\udc00"
          codecs.register_error("test.ignore", codecs.ignore_errors)
          for enc in ALL_CJKENCODINGS:
              self.assertEqual(data.encode(enc, "test.ignore"), b'')
  
      def test_codingspec(self):
          try:
              for enc in ALL_CJKENCODINGS:
                  code = '# coding: {}\n'.format(enc)
                  exec(code)
          finally:
              support.unlink(TESTFN)
  
      def test_init_segfault(self):
          # bug #3305: this used to segfault
          self.assertRaises(AttributeError,
                            _multibytecodec.MultibyteStreamReader, None)
          self.assertRaises(AttributeError,
                            _multibytecodec.MultibyteStreamWriter, None)
  
      def test_decode_unicode(self):
          # Trying to decode a unicode string should raise a TypeError
          for enc in ALL_CJKENCODINGS:
              self.assertRaises(TypeError, codecs.getdecoder(enc), "")
  
  class Test_IncrementalEncoder(unittest.TestCase):
  
      def test_stateless(self):
          # cp949 encoder isn't stateful at all.
          encoder = codecs.getincrementalencoder('cp949')()
          self.assertEqual(encoder.encode('\ud30c\uc774\uc36c \ub9c8\uc744'),
                           b'\xc6\xc4\xc0\xcc\xbd\xe3 \xb8\xb6\xc0\xbb')
          self.assertEqual(encoder.reset(), None)
          self.assertEqual(encoder.encode('\u2606\u223c\u2606', True),
                           b'\xa1\xd9\xa1\xad\xa1\xd9')
          self.assertEqual(encoder.reset(), None)
          self.assertEqual(encoder.encode('', True), b'')
          self.assertEqual(encoder.encode('', False), b'')
          self.assertEqual(encoder.reset(), None)
  
      def test_stateful(self):
          # jisx0213 encoder is stateful for a few code points. eg)
          #   U+00E6 => A9DC
          #   U+00E6 U+0300 => ABC4
          #   U+0300 => ABDC
  
          encoder = codecs.getincrementalencoder('jisx0213')()
          self.assertEqual(encoder.encode('\u00e6\u0300'), b'\xab\xc4')
          self.assertEqual(encoder.encode('\u00e6'), b'')
          self.assertEqual(encoder.encode('\u0300'), b'\xab\xc4')
          self.assertEqual(encoder.encode('\u00e6', True), b'\xa9\xdc')
  
          self.assertEqual(encoder.reset(), None)
          self.assertEqual(encoder.encode('\u0300'), b'\xab\xdc')
  
          self.assertEqual(encoder.encode('\u00e6'), b'')
          self.assertEqual(encoder.encode('', True), b'\xa9\xdc')
          self.assertEqual(encoder.encode('', True), b'')
  
      def test_stateful_keep_buffer(self):
          encoder = codecs.getincrementalencoder('jisx0213')()
          self.assertEqual(encoder.encode('\u00e6'), b'')
          self.assertRaises(UnicodeEncodeError, encoder.encode, '\u0123')
          self.assertEqual(encoder.encode('\u0300\u00e6'), b'\xab\xc4')
          self.assertRaises(UnicodeEncodeError, encoder.encode, '\u0123')
          self.assertEqual(encoder.reset(), None)
          self.assertEqual(encoder.encode('\u0300'), b'\xab\xdc')
          self.assertEqual(encoder.encode('\u00e6'), b'')
          self.assertRaises(UnicodeEncodeError, encoder.encode, '\u0123')
          self.assertEqual(encoder.encode('', True), b'\xa9\xdc')
  
      def test_state_methods_with_buffer_state(self):
          # euc_jis_2004 stores state as a buffer of pending bytes
          encoder = codecs.getincrementalencoder('euc_jis_2004')()
  
          initial_state = encoder.getstate()
          self.assertEqual(encoder.encode('\u00e6\u0300'), b'\xab\xc4')
          encoder.setstate(initial_state)
          self.assertEqual(encoder.encode('\u00e6\u0300'), b'\xab\xc4')
  
          self.assertEqual(encoder.encode('\u00e6'), b'')
          partial_state = encoder.getstate()
          self.assertEqual(encoder.encode('\u0300'), b'\xab\xc4')
          encoder.setstate(partial_state)
          self.assertEqual(encoder.encode('\u0300'), b'\xab\xc4')
  
      def test_state_methods_with_non_buffer_state(self):
          # iso2022_jp stores state without using a buffer
          encoder = codecs.getincrementalencoder('iso2022_jp')()
  
          self.assertEqual(encoder.encode('z'), b'z')
          en_state = encoder.getstate()
  
          self.assertEqual(encoder.encode('\u3042'), b'\x1b\x24\x42\x24\x22')
          jp_state = encoder.getstate()
          self.assertEqual(encoder.encode('z'), b'\x1b\x28\x42z')
  
          encoder.setstate(jp_state)
          self.assertEqual(encoder.encode('\u3042'), b'\x24\x22')
  
          encoder.setstate(en_state)
          self.assertEqual(encoder.encode('z'), b'z')
  
      def test_getstate_returns_expected_value(self):
          # Note: getstate is implemented such that these state values
          # are expected to be the same across all builds of Python,
          # regardless of x32/64 bit, endianness and compiler.
  
          # euc_jis_2004 stores state as a buffer of pending bytes
          buffer_state_encoder = codecs.getincrementalencoder('euc_jis_2004')()
          self.assertEqual(buffer_state_encoder.getstate(), 0)
          buffer_state_encoder.encode('\u00e6')
          self.assertEqual(buffer_state_encoder.getstate(),
                           int.from_bytes(
                               b"\x02"
                               b"\xc3\xa6"
                               b"\x00\x00\x00\x00\x00\x00\x00\x00",
                               'little'))
          buffer_state_encoder.encode('\u0300')
          self.assertEqual(buffer_state_encoder.getstate(), 0)
  
          # iso2022_jp stores state without using a buffer
          non_buffer_state_encoder = codecs.getincrementalencoder('iso2022_jp')()
          self.assertEqual(non_buffer_state_encoder.getstate(),
                           int.from_bytes(
                               b"\x00"
                               b"\x42\x42\x00\x00\x00\x00\x00\x00",
                               'little'))
          non_buffer_state_encoder.encode('\u3042')
          self.assertEqual(non_buffer_state_encoder.getstate(),
                           int.from_bytes(
                               b"\x00"
                               b"\xc2\x42\x00\x00\x00\x00\x00\x00",
                               'little'))
  
      def test_setstate_validates_input_size(self):
          encoder = codecs.getincrementalencoder('euc_jp')()
          pending_size_nine = int.from_bytes(
              b"\x09"
              b"\x00\x00\x00\x00\x00\x00\x00\x00"
              b"\x00\x00\x00\x00\x00\x00\x00\x00",
              'little')
          self.assertRaises(UnicodeError, encoder.setstate, pending_size_nine)
  
      def test_setstate_validates_input_bytes(self):
          encoder = codecs.getincrementalencoder('euc_jp')()
          invalid_utf8 = int.from_bytes(
              b"\x01"
              b"\xff"
              b"\x00\x00\x00\x00\x00\x00\x00\x00",
              'little')
          self.assertRaises(UnicodeDecodeError, encoder.setstate, invalid_utf8)
  
      def test_issue5640(self):
          encoder = codecs.getincrementalencoder('shift-jis')('backslashreplace')
          self.assertEqual(encoder.encode('\xff'), b'\\xff')
          self.assertEqual(encoder.encode('\n'), b'\n')
  
  class Test_IncrementalDecoder(unittest.TestCase):
  
      def test_dbcs(self):
          # cp949 decoder is simple with only 1 or 2 bytes sequences.
          decoder = codecs.getincrementaldecoder('cp949')()
          self.assertEqual(decoder.decode(b'\xc6\xc4\xc0\xcc\xbd'),
                           '\ud30c\uc774')
          self.assertEqual(decoder.decode(b'\xe3 \xb8\xb6\xc0\xbb'),
                           '\uc36c \ub9c8\uc744')
          self.assertEqual(decoder.decode(b''), '')
  
      def test_dbcs_keep_buffer(self):
          decoder = codecs.getincrementaldecoder('cp949')()
          self.assertEqual(decoder.decode(b'\xc6\xc4\xc0'), '\ud30c')
          self.assertRaises(UnicodeDecodeError, decoder.decode, b'', True)
          self.assertEqual(decoder.decode(b'\xcc'), '\uc774')
  
          self.assertEqual(decoder.decode(b'\xc6\xc4\xc0'), '\ud30c')
          self.assertRaises(UnicodeDecodeError, decoder.decode,
                            b'\xcc\xbd', True)
          self.assertEqual(decoder.decode(b'\xcc'), '\uc774')
  
      def test_iso2022(self):
          decoder = codecs.getincrementaldecoder('iso2022-jp')()
          ESC = b'\x1b'
          self.assertEqual(decoder.decode(ESC + b'('), '')
          self.assertEqual(decoder.decode(b'B', True), '')
          self.assertEqual(decoder.decode(ESC + b'$'), '')
          self.assertEqual(decoder.decode(b'B@$'), '\u4e16')
          self.assertEqual(decoder.decode(b'@$@'), '\u4e16')
          self.assertEqual(decoder.decode(b'$', True), '\u4e16')
          self.assertEqual(decoder.reset(), None)
          self.assertEqual(decoder.decode(b'@$'), '@$')
          self.assertEqual(decoder.decode(ESC + b'$'), '')
          self.assertRaises(UnicodeDecodeError, decoder.decode, b'', True)
          self.assertEqual(decoder.decode(b'B@$'), '\u4e16')
  
      def test_decode_unicode(self):
          # Trying to decode a unicode string should raise a TypeError
          for enc in ALL_CJKENCODINGS:
              decoder = codecs.getincrementaldecoder(enc)()
              self.assertRaises(TypeError, decoder.decode, "")
  
      def test_state_methods(self):
          decoder = codecs.getincrementaldecoder('euc_jp')()
  
          # Decode a complete input sequence
          self.assertEqual(decoder.decode(b'\xa4\xa6'), '\u3046')
          pending1, _ = decoder.getstate()
          self.assertEqual(pending1, b'')
  
          # Decode first half of a partial input sequence
          self.assertEqual(decoder.decode(b'\xa4'), '')
          pending2, flags2 = decoder.getstate()
          self.assertEqual(pending2, b'\xa4')
  
          # Decode second half of a partial input sequence
          self.assertEqual(decoder.decode(b'\xa6'), '\u3046')
          pending3, _ = decoder.getstate()
          self.assertEqual(pending3, b'')
  
          # Jump back and decode second half of partial input sequence again
          decoder.setstate((pending2, flags2))
          self.assertEqual(decoder.decode(b'\xa6'), '\u3046')
          pending4, _ = decoder.getstate()
          self.assertEqual(pending4, b'')
  
          # Ensure state values are preserved correctly
          decoder.setstate((b'abc', 123456789))
          self.assertEqual(decoder.getstate(), (b'abc', 123456789))
  
      def test_setstate_validates_input(self):
          decoder = codecs.getincrementaldecoder('euc_jp')()
          self.assertRaises(TypeError, decoder.setstate, 123)
          self.assertRaises(TypeError, decoder.setstate, ("invalid", 0))
          self.assertRaises(TypeError, decoder.setstate, (b"1234", "invalid"))
          self.assertRaises(UnicodeError, decoder.setstate, (b"123456789", 0))
  
  class Test_StreamReader(unittest.TestCase):
      def test_bug1728403(self):
          try:
              f = open(TESTFN, 'wb')
              try:
                  f.write(b'\xa1')
              finally:
                  f.close()
              f = codecs.open(TESTFN, encoding='cp949')
              try:
                  self.assertRaises(UnicodeDecodeError, f.read, 2)
              finally:
                  f.close()
          finally:
              support.unlink(TESTFN)
  
  class Test_StreamWriter(unittest.TestCase):
      def test_gb18030(self):
          s= io.BytesIO()
          c = codecs.getwriter('gb18030')(s)
          c.write('123')
          self.assertEqual(s.getvalue(), b'123')
          c.write('\U00012345')
          self.assertEqual(s.getvalue(), b'123\x907\x959')
          c.write('\uac00\u00ac')
          self.assertEqual(s.getvalue(),
                  b'123\x907\x959\x827\xcf5\x810\x851')
  
      def test_utf_8(self):
          s= io.BytesIO()
          c = codecs.getwriter('utf-8')(s)
          c.write('123')
          self.assertEqual(s.getvalue(), b'123')
          c.write('\U00012345')
          self.assertEqual(s.getvalue(), b'123\xf0\x92\x8d\x85')
          c.write('\uac00\u00ac')
          self.assertEqual(s.getvalue(),
              b'123\xf0\x92\x8d\x85'
              b'\xea\xb0\x80\xc2\xac')
  
      def test_streamwriter_strwrite(self):
          s = io.BytesIO()
          wr = codecs.getwriter('gb18030')(s)
          wr.write('abcd')
          self.assertEqual(s.getvalue(), b'abcd')
  
  class Test_ISO2022(unittest.TestCase):
      def test_g2(self):
          iso2022jp2 = b'\x1b(B:hu4:unit\x1b.A\x1bNi de famille'
          uni = ':hu4:unit\xe9 de famille'
          self.assertEqual(iso2022jp2.decode('iso2022-jp-2'), uni)
  
      def test_iso2022_jp_g0(self):
          self.assertNotIn(b'\x0e', '\N{SOFT HYPHEN}'.encode('iso-2022-jp-2'))
          for encoding in ('iso-2022-jp-2004', 'iso-2022-jp-3'):
              e = '\u3406'.encode(encoding)
              self.assertFalse(any(x > 0x80 for x in e))
  
      def test_bug1572832(self):
          for x in range(0x10000, 0x110000):
              # Any ISO 2022 codec will cause the segfault
              chr(x).encode('iso_2022_jp', 'ignore')
  
  class TestStateful(unittest.TestCase):
      text = '\u4E16\u4E16'
      encoding = 'iso-2022-jp'
      expected = b'\x1b$B@$@$'
      reset = b'\x1b(B'
      expected_reset = expected + reset
  
      def test_encode(self):
          self.assertEqual(self.text.encode(self.encoding), self.expected_reset)
  
      def test_incrementalencoder(self):
          encoder = codecs.getincrementalencoder(self.encoding)()
          output = b''.join(
              encoder.encode(char)
              for char in self.text)
          self.assertEqual(output, self.expected)
          self.assertEqual(encoder.encode('', final=True), self.reset)
          self.assertEqual(encoder.encode('', final=True), b'')
  
      def test_incrementalencoder_final(self):
          encoder = codecs.getincrementalencoder(self.encoding)()
          last_index = len(self.text) - 1
          output = b''.join(
              encoder.encode(char, index == last_index)
              for index, char in enumerate(self.text))
          self.assertEqual(output, self.expected_reset)
          self.assertEqual(encoder.encode('', final=True), b'')
  
  class TestHZStateful(TestStateful):
      text = '\u804a\u804a'
      encoding = 'hz'
      expected = b'~{ADAD'
      reset = b'~}'
      expected_reset = expected + reset
  
  
  if __name__ == "__main__":
      unittest.main()
  