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bpo-36312: Fix decoders for some code pages. (GH-12369)

This commit is contained in:
Serhiy Storchaka 2019-03-20 21:45:18 +02:00 committed by GitHub
parent cc60cdd9c4
commit c1e2c288f4
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3 changed files with 27 additions and 5 deletions
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9
Lib/test/test_codecs.py
View File

@ -3066,6 +3066,15 @@ class CodePageTest(unittest.TestCase):
('[\U0010ffff\uDC80]', 'replace', b'[\xf4\x8f\xbf\xbf?]'),
))
def test_code_page_decode_flags(self):
# Issue #36312: For some code pages (e.g. UTF-7) flags for
# MultiByteToWideChar() must be set to 0.
for cp in (50220, 50221, 50222, 50225, 50227, 50229,
*range(57002, 57011+1), 65000):
self.assertEqual(codecs.code_page_decode(cp, b'abc'), ('abc', 3))
self.assertEqual(codecs.code_page_decode(42, b'abc'),
('\uf061\uf062\uf063', 3))
def test_incremental(self):
decoded = codecs.code_page_decode(932, b'\x82', 'strict', False)
self.assertEqual(decoded, ('', 0))

2
Misc/NEWS.d/next/Windows/2019-03-16-16-51-17.bpo-36312.Niwm-T.rst Normal file
View File

@ -0,0 +1,2 @@
Fixed decoders for the following code pages: 50220, 50221, 50222, 50225,
50227, 50229, 57002 through 57011, 65000 and 42.

21
Objects/unicodeobject.c
View File

@ -7083,15 +7083,21 @@ decode_code_page_strict(UINT code_page,
const char *in,
int insize)
{
const DWORD flags = decode_code_page_flags(code_page);
DWORD flags = MB_ERR_INVALID_CHARS;
wchar_t *out;
DWORD outsize;
/* First get the size of the result */
assert(insize > 0);
outsize = MultiByteToWideChar(code_page, flags, in, insize, NULL, 0);
if (outsize <= 0)
goto error;
while ((outsize = MultiByteToWideChar(code_page, flags,
in, insize, NULL, 0)) <= 0)
{
if (!flags || GetLastError() != ERROR_INVALID_FLAGS) {
goto error;
}
/* For some code pages (e.g. UTF-7) flags must be set to 0. */
flags = 0;
}
/* Extend a wchar_t* buffer */
Py_ssize_t n = *bufsize; /* Get the current length */
@ -7129,7 +7135,7 @@ decode_code_page_errors(UINT code_page,
{
const char *startin = in;
const char *endin = in + size;
const DWORD flags = decode_code_page_flags(code_page);
DWORD flags = MB_ERR_INVALID_CHARS;
/* Ideally, we should get reason from FormatMessage. This is the Windows
2000 English version of the message. */
const char *reason = "No mapping for the Unicode character exists "
@ -7187,6 +7193,11 @@ decode_code_page_errors(UINT code_page,
if (outsize > 0)
break;
err = GetLastError();
if (err == ERROR_INVALID_FLAGS && flags) {
/* For some code pages (e.g. UTF-7) flags must be set to 0. */
flags = 0;
continue;
}
if (err != ERROR_NO_UNICODE_TRANSLATION
&& err != ERROR_INSUFFICIENT_BUFFER)
{