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use immutable strings table in extractEncodingDecl()

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Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2021-03-31 16:38:57 +03:00
parent 55ce388fc0
commit ecf37fb164
1 changed files with 12 additions and 4 deletions
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16
src/xml/sax/qxml.cpp
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@ -1457,12 +1457,20 @@ void QXmlInputSource::fetchData()
#ifndef QT_NO_TEXTCODEC
static QString extractEncodingDecl(const QString &text, bool *needMoreText)
{
int l = text.length();
QString snip = QString::fromLatin1("<?xml").left(l);
if (l > 0 && !text.startsWith(snip))
static const QLatin1String snipsTbl[] {
QLatin1String("<"),
QLatin1String("<?"),
QLatin1String("<?x"),
QLatin1String("<?xm"),
QLatin1String("<?xml"),
};
const int l = text.length();
const int snipindex = qBound(0, l, 5) - 1;
if (l > 0 && !text.startsWith(snipsTbl[snipindex]))
return QString();
int endPos = text.indexOf(QLatin1Char('>'));
const int endPos = text.indexOf(QLatin1Char('>'));
if (endPos == -1) {
*needMoreText = l < 255; // we won't look forever
return QString();