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ODBC SQL driver: deal with different sizes of SQLTCHAR correctly

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Neither the UTF-32, nor the UTF-8 recoding of a UTF-16 string is
necessarily of the same length as the input. The UTF-32 version may
be shorter, if surrogate pairs were encountered. The UTF-8 version
will be longer whenever the string contains non-US-ASCII characters.

Split toSQLTCHAR() into three functions, templated on sizeof(SQLTCHAR),
and use QVLA's range-append instead of manual memcpy()s.

This patch specifically doesn't use constexpr-if, as that's not
available until C++17, which Qt 5 doesn't require.

Change-Id: I0bfcb66eb321598908ef00ac34c888fdbccf9316
Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit 66767eea46bea0f19f8ae5ad6ebc641d86867701)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>
This commit is contained in:
Marc Mutz 2023-01-24 14:29:27 +01:00 committed by Qt Cherry-pick Bot
parent 87a176a8b3
commit db1ba05320
1 changed files with 30 additions and 14 deletions
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44
src/plugins/sqldrivers/odbc/qsql_odbc.cpp
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@ -58,23 +58,39 @@ inline static QString fromSQLTCHAR(const QVarLengthArray<SQLTCHAR>& input, qsize
return result;
}
template <size_t SizeOfChar = sizeof(SQLTCHAR)>
void toSQLTCHARImpl(QVarLengthArray<SQLTCHAR> &result, const QString &input); // primary template undefined
template <typename Container>
void do_append(QVarLengthArray<SQLTCHAR> &result, const Container &c)
{
result.append(reinterpret_cast<const SQLTCHAR *>(c.data()), c.size());
}
template <>
void toSQLTCHARImpl<1>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
{
const auto u8 = input.toUtf8();
do_append(result, u8);
}
template <>
void toSQLTCHARImpl<2>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
{
do_append(result, input);
}
template <>
void toSQLTCHARImpl<4>(QVarLengthArray<SQLTCHAR> &result, const QString &input)
{
const auto u32 = input.toUcs4();
do_append(result, u32);
}
inline static QVarLengthArray<SQLTCHAR> toSQLTCHAR(const QString &input)
{
QVarLengthArray<SQLTCHAR> result;
result.resize(input.size());
switch(sizeof(SQLTCHAR)) {
case 1:
memcpy(result.data(), input.toUtf8().data(), input.size());
break;
case 2:
memcpy(result.data(), input.unicode(), input.size() * 2);
break;
case 4:
memcpy(result.data(), input.toUcs4().data(), input.size() * 4);
break;
default:
qCritical("sizeof(SQLTCHAR) is %d. Don't know how to handle this.", int(sizeof(SQLTCHAR)));
}
toSQLTCHARImpl(result, input);
result.append(0); // make sure it's null terminated, doesn't matter if it already is, it does if it isn't.
return result;
}