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PCX: Fix reading of the extended palette

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The VGA palette starts 769 bytes before the end of the file. There may be PADs between the end of the image and the start of the palette.

BUG: 463951
This commit is contained in:
Mirco Miranda 2023-01-11 22:56:38 +00:00 committed by Albert Astals Cid
parent 4c6d2b92b6
commit 14742cb502
3 changed files with 14 additions and 3 deletions
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autotests/read/pcx/ccbug_463951.pcx Normal file
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17
src/imageformats/pcx.cpp
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@ -367,10 +367,21 @@ static void readImage8(QImage &img, QDataStream &s, const PCXHEADER &header)
}
}
quint8 flag;
s >> flag;
// qDebug() << "Palette Flag: " << flag;
// by specification, the extended palette starts at file.size() - 769
quint8 flag = 0;
if (auto device = s.device()) {
if (device->isSequential()) {
while (flag != 12 && s.status() == QDataStream::Ok) {
s >> flag;
}
}
else {
device->seek(device->size() - 769);
s >> flag;
}
}
// qDebug() << "Palette Flag: " << flag;
if (flag == 12 && (header.Version == 5 || header.Version == 2)) {
// Read the palette
quint8 r;