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Issue #16979: Fix error handling bugs in the unicode-escape-decode decoder.

This commit is contained in:
Serhiy Storchaka 2013-01-29 10:20:44 +02:00
parent 8e0ae2a4f0
commit d679377be7
4 changed files with 117 additions and 53 deletions
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4
Lib/test/test_codeccallbacks.py
View File

@ -262,12 +262,12 @@ class CodecCallbackTest(unittest.TestCase):
self.assertEqual(
b"\\u3042\u3xxx".decode("unicode-escape", "test.handler1"),
"\u3042[<92><117><51><120>]xx"
"\u3042[<92><117><51>]xxx"
)
self.assertEqual(
b"\\u3042\u3xx".decode("unicode-escape", "test.handler1"),
"\u3042[<92><117><51><120><120>]"
"\u3042[<92><117><51>]xx"
)
self.assertEqual(

85
Lib/test/test_codecs.py
View File

@ -4,6 +4,11 @@ import codecs
import locale
import sys, _testcapi, io
def coding_checker(self, coder):
def check(input, expect):
self.assertEqual(coder(input), (expect, len(input)))
return check
class Queue(object):
"""
queue: write bytes at one end, read bytes from the other end
@ -1846,6 +1851,85 @@ class TypesTest(unittest.TestCase):
self.assertEqual(codecs.raw_unicode_escape_decode(r"\u1234"), ("\u1234", 6))
self.assertEqual(codecs.raw_unicode_escape_decode(br"\u1234"), ("\u1234", 6))
class UnicodeEscapeTest(unittest.TestCase):
def test_empty(self):
self.assertEqual(codecs.unicode_escape_encode(""), (b"", 0))
self.assertEqual(codecs.unicode_escape_decode(b""), ("", 0))
def test_raw_encode(self):
encode = codecs.unicode_escape_encode
for b in range(32, 127):
if b != b'\\'[0]:
self.assertEqual(encode(chr(b)), (bytes([b]), 1))
def test_raw_decode(self):
decode = codecs.unicode_escape_decode
for b in range(256):
if b != b'\\'[0]:
self.assertEqual(decode(bytes([b]) + b'0'), (chr(b) + '0', 2))
def test_escape_encode(self):
encode = codecs.unicode_escape_encode
check = coding_checker(self, encode)
check('\t', br'\t')
check('\n', br'\n')
check('\r', br'\r')
check('\\', br'\\')
for b in range(32):
if chr(b) not in '\t\n\r':
check(chr(b), ('\\x%02x' % b).encode())
for b in range(127, 256):
check(chr(b), ('\\x%02x' % b).encode())
check('\u20ac', br'\u20ac')
check('\U0001d120', br'\U0001d120')
def test_escape_decode(self):
decode = codecs.unicode_escape_decode
check = coding_checker(self, decode)
check(b"[\\\n]", "[]")
check(br'[\"]', '["]')
check(br"[\']", "[']")
check(br"[\\]", r"[\]")
check(br"[\a]", "[\x07]")
check(br"[\b]", "[\x08]")
check(br"[\t]", "[\x09]")
check(br"[\n]", "[\x0a]")
check(br"[\v]", "[\x0b]")
check(br"[\f]", "[\x0c]")
check(br"[\r]", "[\x0d]")
check(br"[\7]", "[\x07]")
check(br"[\8]", r"[\8]")
check(br"[\78]", "[\x078]")
check(br"[\41]", "[!]")
check(br"[\418]", "[!8]")
check(br"[\101]", "[A]")
check(br"[\1010]", "[A0]")
check(br"[\x41]", "[A]")
check(br"[\x410]", "[A0]")
check(br"\u20ac", "\u20ac")
check(br"\U0001d120", "\U0001d120")
for b in range(256):
if b not in b'\n"\'\\abtnvfr01234567xuUN':
check(b'\\' + bytes([b]), '\\' + chr(b))
def test_decode_errors(self):
decode = codecs.unicode_escape_decode
for c, d in (b'x', 2), (b'u', 4), (b'U', 4):
for i in range(d):
self.assertRaises(UnicodeDecodeError, decode,
b"\\" + c + b"0"*i)
self.assertRaises(UnicodeDecodeError, decode,
b"[\\" + c + b"0"*i + b"]")
data = b"[\\" + c + b"0"*i + b"]\\" + c + b"0"*i
self.assertEqual(decode(data, "ignore"), ("[]", len(data)))
self.assertEqual(decode(data, "replace"),
("[\ufffd]\ufffd", len(data)))
self.assertRaises(UnicodeDecodeError, decode, br"\U00110000")
self.assertEqual(decode(br"\U00110000", "ignore"), ("", 10))
self.assertEqual(decode(br"\U00110000", "replace"), ("\ufffd", 10))
class SurrogateEscapeTest(unittest.TestCase):
def test_utf8(self):
@ -2011,6 +2095,7 @@ def test_main():
CharmapTest,
WithStmtTest,
TypesTest,
UnicodeEscapeTest,
SurrogateEscapeTest,
BomTest,
TransformCodecTest,

2
Misc/NEWS
View File

@ -214,6 +214,8 @@ Core and Builtins
Library
-------
- Issue #16979: Fix error handling bugs in the unicode-escape-decode decoder.
- Issue #9290: In IDLE the sys.std* streams now implement io.TextIOBase
interface and support all mandatory methods and properties.

79
Objects/unicodeobject.c
View File

@ -3760,7 +3760,6 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
Py_ssize_t startinpos;
Py_ssize_t endinpos;
Py_ssize_t outpos;
int i;
PyUnicodeObject *v;
Py_UNICODE *p;
const char *end;
@ -3846,29 +3845,19 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
message = "truncated \\UXXXXXXXX escape";
hexescape:
chr = 0;
outpos = p-PyUnicode_AS_UNICODE(v);
if (s+digits>end) {
endinpos = size;
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", "end of string in escape sequence",
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
goto nextByte;
}
for (i = 0; i < digits; ++i) {
c = (unsigned char) s[i];
if (!Py_ISXDIGIT(c)) {
endinpos = (s+i+1)-starts;
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", message,
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
goto nextByte;
if (end - s < digits) {
/* count only hex digits */
for (; s < end; ++s) {
c = (unsigned char)*s;
if (!Py_ISXDIGIT(c))
goto error;
}
goto error;
}
for (; digits--; ++s) {
c = (unsigned char)*s;
if (!Py_ISXDIGIT(c))
goto error;
chr = (chr<<4) & ~0xF;
if (c >= '0' && c <= '9')
chr += c - '0';
@ -3877,7 +3866,6 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
else
chr += 10 + c - 'A';
}
s += i;
if (chr == 0xffffffff && PyErr_Occurred())
/* _decoding_error will have already written into the
target buffer. */
@ -3898,14 +3886,8 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
*p++ = 0xDC00 + (Py_UNICODE) (chr & 0x03FF);
#endif
} else {
endinpos = s-starts;
outpos = p-PyUnicode_AS_UNICODE(v);
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", "illegal Unicode character",
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
message = "illegal Unicode character";
goto error;
}
break;
@ -3932,28 +3914,13 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
goto store;
}
}
endinpos = s-starts;
outpos = p-PyUnicode_AS_UNICODE(v);
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", message,
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
break;
goto error;
default:
if (s > end) {
message = "\\ at end of string";
s--;
endinpos = s-starts;
outpos = p-PyUnicode_AS_UNICODE(v);
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", message,
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
goto error;
}
else {
*p++ = '\\';
@ -3961,8 +3928,18 @@ PyObject *PyUnicode_DecodeUnicodeEscape(const char *s,
}
break;
}
nextByte:
;
continue;
error:
endinpos = s-starts;
outpos = p-PyUnicode_AS_UNICODE(v);
if (unicode_decode_call_errorhandler(
errors, &errorHandler,
"unicodeescape", message,
&starts, &end, &startinpos, &endinpos, &exc, &s,
&v, &outpos, &p))
goto onError;
continue;
}
if (_PyUnicode_Resize(&v, p - PyUnicode_AS_UNICODE(v)) < 0)
goto onError;