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QLocal8Bit::convertToUnicode[win]: Drop MB_PRECOMPOSED flag

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A few code pages do not support this flag[0]. It's also deprecated[1]
and is what Windows prefers to generate by default. So let's drop it.

[0] https://learn.microsoft.com/en-us/windows/win32/api/stringapiset/nf-stringapiset-multibytetowidechar
See note at the end for the dwFlags parameter.

[1] It's mentioned in the header files, but not online...

Pick-to: 6.6 6.5
Task-number: QTBUG-118185
Task-number: QTBUG-105105
Change-Id: I798c387170c73a953be874de139868543b2d775e
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
This commit is contained in:
Mårten Nordheim 2023-10-20 14:05:52 +02:00
parent 2e9bb2ee5d
commit ef24784f88
2 changed files with 5 additions and 8 deletions
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8
src/corelib/text/qstringconverter.cpp
View File

@ -1292,7 +1292,7 @@ static QString convertToUnicodeCharByChar(QByteArrayView in, quint32 codePage,
while ((next = CharNextExA(codePage, mb, 0)) != mb) {
wchar_t wc[2] ={0};
int charlength = int(next - mb); // always just a few bytes
int len = MultiByteToWideChar(codePage, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS, mb, charlength, wc, 2);
int len = MultiByteToWideChar(codePage, MB_ERR_INVALID_CHARS, mb, charlength, wc, 2);
if (len>0) {
s.append(QChar(wc[0]));
} else {
@ -1339,7 +1339,7 @@ QString QLocal8Bit::convertToUnicode_sys(QByteArrayView in, quint32 codePage,
prev[0] = state->state_data[0];
prev[1] = mb[0];
state->remainingChars = 0;
len = MultiByteToWideChar(codePage, MB_PRECOMPOSED, prev, 2, out, outlen);
len = MultiByteToWideChar(codePage, 0, prev, 2, out, outlen);
if (len) {
if (mblen == 1)
return QStringView(out, len).toString();
@ -1350,12 +1350,12 @@ QString QLocal8Bit::convertToUnicode_sys(QByteArrayView in, quint32 codePage,
}
}
while (!(len=MultiByteToWideChar(codePage, MB_PRECOMPOSED|MB_ERR_INVALID_CHARS,
while (!(len=MultiByteToWideChar(codePage, MB_ERR_INVALID_CHARS,
mb, mblen, out, int(outlen)))) {
int r = GetLastError();
if (r == ERROR_INSUFFICIENT_BUFFER) {
Q_ASSERT(QtPrivate::q_points_into_range(out, buf.data(), buf.data() + buf.size()));
const int wclen = MultiByteToWideChar(codePage, MB_PRECOMPOSED, mb, mblen, 0, 0);
const int wclen = MultiByteToWideChar(codePage, 0, mb, mblen, 0, 0);
const qsizetype offset = qsizetype(out - buf.data());
sp.resize(offset + wclen);
auto it = reinterpret_cast<wchar_t *>(sp.data());

5
tests/auto/corelib/text/qstringconverter/tst_qstringconverter.cpp
View File

@ -2568,10 +2568,7 @@ void tst_QStringConverter::fromLocal8Bit_special_cases()
result = QLocal8Bit::convertToUnicode_sys(octets.first(2), GB_18030, &state);
QCOMPARE(result, QString());
QVERIFY(result.isNull());
QEXPECT_FAIL("",
"We don't store enough state to handle this case. + GB 18030 does not work with "
"the MB_PRECOMPOSED flag.",
Abort);
QEXPECT_FAIL("", "We don't store enough state to handle this case.", Abort);
QCOMPARE_GT(state.remainingChars, 0);
// Then provide one more octet:
result = QLocal8Bit::convertToUnicode_sys(octets.sliced(2, 1), GB_18030, &state);