mirror of https://github.com/python/cpython
Patch #435971: UTF-7 codec by Brian Quinlan.
This commit is contained in:
Marc-André Lemburg
parent
26e3b681b2
commit
c60e6f7771
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@ -607,6 +607,24 @@ extern DL_IMPORT(PyObject*) PyUnicode_AsEncodedString(
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const char *errors /* error handling */
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);
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/* --- UTF-7 Codecs ------------------------------------------------------- */
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extern DL_IMPORT(PyObject*) PyUnicode_DecodeUTF7(
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const char *string, /* UTF-7 encoded string */
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int length, /* size of string */
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const char *errors /* error handling */
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);
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extern DL_IMPORT(PyObject*) PyUnicode_EncodeUTF7(
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const Py_UNICODE *data, /* Unicode char buffer */
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int length, /* number of Py_UNICODE chars to encode */
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int encodeSetO, /* force the encoder to encode characters in
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Set O, as described in RFC2152 */
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int encodeWhiteSpace, /* force the encoder to encode space, tab,
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carriage return and linefeed characters */
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const char *errors /* error handling */
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);
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/* --- UTF-8 Codecs ------------------------------------------------------- */
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extern DL_IMPORT(PyObject*) PyUnicode_DecodeUTF8(
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@ -14,6 +14,10 @@ aliases = {
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'latin': 'latin_1',
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'latin1': 'latin_1',
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# UTF-7
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'utf7': 'utf_7',
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'u7': 'utf_7',
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# UTF-8
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'utf': 'utf_8',
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'utf8': 'utf_8',
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@ -377,6 +377,32 @@ print 'done.'
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# Test builtin codecs
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print 'Testing builtin codecs...',
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# UTF-7 specific encoding tests:
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utfTests = [(u'A\u2262\u0391.', 'A+ImIDkQ.'), # RFC2152 example
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(u'Hi Mom -\u263a-!', 'Hi Mom -+Jjo--!'), # RFC2152 example
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(u'\u65E5\u672C\u8A9E', '+ZeVnLIqe-'), # RFC2152 example
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(u'Item 3 is \u00a31.', 'Item 3 is +AKM-1.'), # RFC2152 example
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(u'+', '+-'),
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(u'+-', '+--'),
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(u'+?', '+-?'),
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(u'\?', '+AFw?'),
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(u'+?', '+-?'),
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(ur'\\?', '+AFwAXA?'),
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(ur'\\\?', '+AFwAXABc?'),
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(ur'++--', '+-+---')]
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for x,y in utfTests:
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verify( x.encode('utf-7') == y )
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try:
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unicode('+3ADYAA-', 'utf-7') # surrogates not supported
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except UnicodeError:
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pass
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else:
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raise TestFailed, "unicode('+3ADYAA-', 'utf-7') failed to raise an exception"
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verify(unicode('+3ADYAA-', 'utf-7', 'replace') == u'\ufffd')
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# UTF-8 specific encoding tests:
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verify(u'\u20ac'.encode('utf-8') == \
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''.join((chr(0xe2), chr(0x82), chr(0xac))) )
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@ -439,6 +465,7 @@ verify(unicode('Andr\202 x','ascii','ignore') == u"Andr x")
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verify(unicode('Andr\202 x','ascii','replace') == u'Andr\uFFFD x')
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verify(u'hello'.encode('ascii') == 'hello')
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verify(u'hello'.encode('utf-7') == 'hello')
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verify(u'hello'.encode('utf-8') == 'hello')
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verify(u'hello'.encode('utf8') == 'hello')
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verify(u'hello'.encode('utf-16-le') == 'h\000e\000l\000l\000o\000')
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@ -447,7 +474,7 @@ verify(u'hello'.encode('latin-1') == 'hello')
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# Roundtrip safety for BMP (just the first 1024 chars)
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u = u''.join(map(unichr, range(1024)))
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for encoding in ('utf-8', 'utf-16', 'utf-16-le', 'utf-16-be',
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for encoding in ('utf-7', 'utf-8', 'utf-16', 'utf-16-le', 'utf-16-be',
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'raw_unicode_escape', 'unicode_escape', 'unicode_internal'):
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verify(unicode(u.encode(encoding),encoding) == u)
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@ -123,6 +123,22 @@ unicode_internal_decode(PyObject *self,
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}
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}
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static PyObject *
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utf_7_decode(PyObject *self,
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PyObject *args)
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{
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const char *data;
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int size;
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const char *errors = NULL;
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if (!PyArg_ParseTuple(args, "t#|z:utf_7_decode",
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&data, &size, &errors))
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return NULL;
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return codec_tuple(PyUnicode_DecodeUTF7(data, size, errors),
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size);
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}
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static PyObject *
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utf_8_decode(PyObject *self,
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PyObject *args)
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@ -381,6 +397,30 @@ unicode_internal_encode(PyObject *self,
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}
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}
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static PyObject *
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utf_7_encode(PyObject *self,
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PyObject *args)
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{
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PyObject *str, *v;
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const char *errors = NULL;
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if (!PyArg_ParseTuple(args, "O|z:utf_7_encode",
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&str, &errors))
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return NULL;
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str = PyUnicode_FromObject(str);
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if (str == NULL)
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return NULL;
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v = codec_tuple(PyUnicode_EncodeUTF7(PyUnicode_AS_UNICODE(str),
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PyUnicode_GET_SIZE(str),
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0,
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0,
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errors),
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PyUnicode_GET_SIZE(str));
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Py_DECREF(str);
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return v;
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}
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static PyObject *
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utf_8_encode(PyObject *self,
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PyObject *args)
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@ -632,6 +672,8 @@ static PyMethodDef _codecs_functions[] = {
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#ifdef Py_USING_UNICODE
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{"utf_8_encode", utf_8_encode, 1},
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{"utf_8_decode", utf_8_decode, 1},
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{"utf_7_encode", utf_7_encode, 1},
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{"utf_7_decode", utf_7_decode, 1},
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{"utf_16_encode", utf_16_encode, 1},
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{"utf_16_le_encode", utf_16_le_encode, 1},
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{"utf_16_be_encode", utf_16_be_encode, 1},
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@ -635,6 +635,306 @@ int PyUnicode_SetDefaultEncoding(const char *encoding)
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return -1;
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}
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/* --- UTF-7 Codec -------------------------------------------------------- */
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/* see RFC2152 for details */
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static
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char utf7_special[128] = {
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/* indicate whether a UTF-7 character is special i.e. cannot be directly
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encoded:
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0 - not special
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1 - special
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2 - whitespace (optional)
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3 - RFC2152 Set O (optional) */
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1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 2, 1, 1,
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1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
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2, 3, 3, 3, 3, 3, 3, 0, 0, 0, 3, 1, 0, 0, 0, 1,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 3, 0,
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3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 1, 3, 3, 3,
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3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 3, 3, 1, 1,
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};
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#define SPECIAL(c, encodeO, encodeWS) \
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(((c)>127 || utf7_special[(c)] == 1) || \
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(encodeWS && (utf7_special[(c)] == 2)) || \
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(encodeO && (utf7_special[(c)] == 3)))
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#define B64(n) ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"[(n) & 0x3f])
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#define B64CHAR(c) (isalnum(c) || (c) == '+' || (c) == '/')
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#define UB64(c) ((c) == '+' ? 62 : (c) == '/' ? 63 : (c) >= 'a' ? \
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(c) - 71 : (c) >= 'A' ? (c) - 65 : (c) + 4)
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#define ENCODE(out, ch, bits) \
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while (bits >= 6) { \
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*out++ = B64(ch >> (bits-6)); \
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bits -= 6; \
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}
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#define DECODE(out, ch, bits, surrogate) \
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while (bits >= 16) { \
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Py_UNICODE outCh = (Py_UNICODE) ((ch >> (bits-16)) & 0xffff); \
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bits -= 16; \
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if (surrogate) { \
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/* We have already generated an error for the high surrogate
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so let's not bother seeing if the low surrogate is correct or not */\
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surrogate = 0; \
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} else if (0xDC00 <= outCh && outCh <= 0xDFFF) { \
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/* This is a surrogate pair. Unfortunately we can't represent \
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it in a 16-bit character */ \
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surrogate = 1; \
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errmsg = "code pairs are not supported"; \
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goto utf7Error; \
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} else { \
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*out++ = outCh; \
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} \
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} \
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static
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int utf7_decoding_error(Py_UNICODE **dest,
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const char *errors,
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const char *details)
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{
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if ((errors == NULL) ||
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(strcmp(errors,"strict") == 0)) {
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PyErr_Format(PyExc_UnicodeError,
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"UTF-7 decoding error: %.400s",
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details);
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return -1;
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}
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else if (strcmp(errors,"ignore") == 0) {
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return 0;
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}
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else if (strcmp(errors,"replace") == 0) {
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if (dest != NULL) {
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**dest = Py_UNICODE_REPLACEMENT_CHARACTER;
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(*dest)++;
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}
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return 0;
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}
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else {
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PyErr_Format(PyExc_ValueError,
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"UTF-7 decoding error; unknown error handling code: %.400s",
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errors);
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return -1;
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}
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}
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PyObject *PyUnicode_DecodeUTF7(const char *s,
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int size,
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const char *errors)
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{
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const char *e;
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PyUnicodeObject *unicode;
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Py_UNICODE *p;
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const char *errmsg = "";
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int inShift = 0;
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unsigned int bitsleft = 0;
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unsigned long charsleft = 0;
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int surrogate = 0;
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unicode = _PyUnicode_New(size);
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if (!unicode)
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return NULL;
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if (size == 0)
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return (PyObject *)unicode;
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p = unicode->str;
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e = s + size;
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while (s < e) {
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Py_UNICODE ch = *s;
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if (inShift) {
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if ((ch == '-') || !B64CHAR(ch)) {
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inShift = 0;
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s++;
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/* p, charsleft, bitsleft, surrogate = */ DECODE(p, charsleft, bitsleft, surrogate);
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if (bitsleft >= 6) {
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/* The shift sequence has a partial character in it. If
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bitsleft < 6 then we could just classify it as padding
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but that is not the case here */
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errmsg = "partial character in shift sequence";
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goto utf7Error;
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}
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/* According to RFC2152 the remaining bits should be zero. We
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choose to signal an error/insert a replacement character
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here so indicate the potential of a misencoded character. */
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/* On x86, a << b == a << (b%32) so make sure that bitsleft != 0 */
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if (bitsleft && charsleft << (sizeof(charsleft) * 8 - bitsleft)) {
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errmsg = "non-zero padding bits in shift sequence";
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goto utf7Error;
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}
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if (ch == '-') {
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if ((s < e) && (*(s) == '-')) {
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*p++ = '-';
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inShift = 1;
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}
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} else if (SPECIAL(ch,0,0)) {
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errmsg = "unexpected special character";
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goto utf7Error;
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} else {
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*p++ = ch;
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}
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} else {
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charsleft = (charsleft << 6) | UB64(ch);
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bitsleft += 6;
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s++;
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/* p, charsleft, bitsleft, surrogate = */ DECODE(p, charsleft, bitsleft, surrogate);
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}
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}
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else if ( ch == '+' ) {
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s++;
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if (s < e && *s == '-') {
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s++;
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*p++ = '+';
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} else
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{
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inShift = 1;
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bitsleft = 0;
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}
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}
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else if (SPECIAL(ch,0,0)) {
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errmsg = "unexpected special character";
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s++;
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goto utf7Error;
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}
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else {
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*p++ = ch;
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s++;
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}
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continue;
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utf7Error:
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if (utf7_decoding_error(&p, errors, errmsg))
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goto onError;
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}
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if (inShift) {
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if (utf7_decoding_error(&p, errors, "unterminated shift sequence"))
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goto onError;
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}
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if (_PyUnicode_Resize(&unicode, p - unicode->str))
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goto onError;
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return (PyObject *)unicode;
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onError:
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Py_DECREF(unicode);
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return NULL;
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}
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PyObject *PyUnicode_EncodeUTF7(const Py_UNICODE *s,
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int size,
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int encodeSetO,
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int encodeWhiteSpace,
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const char *errors)
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{
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PyObject *v;
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/* It might be possible to tighten this worst case */
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unsigned int cbAllocated = 5 * size;
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int inShift = 0;
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int i = 0;
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unsigned int bitsleft = 0;
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unsigned long charsleft = 0;
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char * out;
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char * start;
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if (size == 0)
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return PyString_FromStringAndSize(NULL, 0);
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v = PyString_FromStringAndSize(NULL, cbAllocated);
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if (v == NULL)
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return NULL;
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start = out = PyString_AS_STRING(v);
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for (;i < size; ++i) {
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Py_UNICODE ch = s[i];
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if (!inShift) {
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if (ch == '+') {
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*out++ = '+';
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*out++ = '-';
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} else if (SPECIAL(ch, encodeSetO, encodeWhiteSpace)) {
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charsleft = ch;
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bitsleft = 16;
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*out++ = '+';
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/* out, charsleft, bitsleft = */ ENCODE(out, charsleft, bitsleft);
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inShift = bitsleft > 0;
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} else {
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*out++ = (char) ch;
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}
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} else {
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if (!SPECIAL(ch, encodeSetO, encodeWhiteSpace)) {
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*out++ = B64(charsleft << (6-bitsleft));
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charsleft = 0;
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bitsleft = 0;
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/* Characters not in the BASE64 set implicitly unshift the sequence
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so no '-' is required, except if the character is itself a '-' */
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if (B64CHAR(ch) || ch == '-') {
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*out++ = '-';
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}
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inShift = 0;
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*out++ = (char) ch;
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} else {
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bitsleft += 16;
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charsleft = (charsleft << 16) | ch;
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/* out, charsleft, bitsleft = */ ENCODE(out, charsleft, bitsleft);
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/* If the next character is special then we dont' need to terminate
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the shift sequence. If the next character is not a BASE64 character
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or '-' then the shift sequence will be terminated implicitly and we
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don't have to insert a '-'. */
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if (bitsleft == 0) {
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if (i + 1 < size) {
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Py_UNICODE ch2 = s[i+1];
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if (SPECIAL(ch2, encodeSetO, encodeWhiteSpace)) {
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} else if (B64CHAR(ch2) || ch2 == '-') {
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*out++ = '-';
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inShift = 0;
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} else {
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inShift = 0;
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}
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}
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else {
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*out++ = '-';
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inShift = 0;
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}
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}
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}
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}
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}
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if (bitsleft) {
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*out++= B64(charsleft << (6-bitsleft) );
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*out++ = '-';
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}
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if (_PyString_Resize(&v, out - start)) {
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Py_DECREF(v);
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return NULL;
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}
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return v;
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}
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#undef SPECIAL
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#undef B64
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#undef B64CHAR
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#undef UB64
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#undef ENCODE
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#undef DECODE
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/* --- UTF-8 Codec -------------------------------------------------------- */
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static
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