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PSD: impreved support to sequential access device

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Mirco Miranda 2022-09-26 12:49:17 +02:00 committed by Albert Astals Cid
parent ea14882ff7
commit c5f7ea7eac
1 changed files with 14 additions and 38 deletions
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52
src/imageformats/psd.cpp
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@ -172,7 +172,8 @@ struct PSDLayerAndMaskSection {
if (globalLayerMaskInfo.size > -1) {
currentSize += globalLayerMaskInfo.size + 4;
}
for (auto && v : additionalLayerInfo.values()) {
auto aliv = additionalLayerInfo.values();
for (auto &&v : aliv) {
currentSize += (12 + v.size);
if (v.signature == S_8B64)
currentSize += 4;
@ -286,12 +287,6 @@ static PSDImageResourceSection readImageResourceSection(QDataStream &s, bool *ok
qint32 sectioSize;
s >> sectioSize;
#ifdef QT_DEBUG
auto pos = qint64();
if (auto dev = s.device())
pos = dev->pos();
#endif
// Reading Image resource block
for (auto size = sectioSize; size > 0;) {
// Length Description
@ -356,14 +351,6 @@ static PSDImageResourceSection readImageResourceSection(QDataStream &s, bool *ok
irs.insert(id, irb);
}
#ifdef QT_DEBUG
if (auto dev = s.device()) {
if ((dev->pos() - pos) != sectioSize) {
*ok = false;
}
}
#endif
return irs;
}
@ -1249,39 +1236,28 @@ bool PSDHandler::canRead(QIODevice *device)
qWarning("PSDHandler::canRead() called with no device");
return false;
}
if (device->isSequential()) {
return false;
}
qint64 oldPos = device->pos();
device->startTransaction();
char head[4];
qint64 readBytes = device->read(head, sizeof(head));
if (readBytes < 0) {
qWarning() << "Read failed" << device->errorString();
return false;
}
QDataStream s(device);
s.setByteOrder(QDataStream::BigEndian);
if (readBytes != sizeof(head)) {
if (device->isSequential()) {
while (readBytes > 0) {
device->ungetChar(head[readBytes-- - 1]);
}
} else {
device->seek(oldPos);
}
PSDHeader header;
s >> header;
device->rollbackTransaction();
if (s.status() != QDataStream::Ok) {
return false;
}
if (device->isSequential()) {
while (readBytes > 0) {
device->ungetChar(head[readBytes-- - 1]);
if (header.color_mode == CM_CMYK || header.color_mode == CM_LABCOLOR || header.color_mode == CM_MULTICHANNEL) {
return false;
}
} else {
device->seek(oldPos);
}
return qstrncmp(head, "8BPS", 4) == 0;
return IsValid(header);
}
QImageIOPlugin::Capabilities PSDPlugin::capabilities(QIODevice *device, const QByteArray &format) const