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diff -up qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.cpp.me qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.cpp
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--- qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.cpp.me 2012-03-30 21:54:59.921331145 +0200
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+++ qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.cpp 2012-03-30 21:58:14.516042067 +0200
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@@ -41,6 +41,7 @@
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#include "qtgafile.h"
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+#include <QtCore/QBuffer>
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#include <QtCore/QIODevice>
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#include <QtCore/QDebug>
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#include <QtCore/QDateTime>
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@@ -264,3 +265,16 @@ QImage QTgaFile::readImage()
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// TODO: add processing of TGA extension information - ie TGA 2.0 files
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return im;
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}
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+/**
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+ * Checks if device contains a valid tga image, *without* changing device
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+ * position.
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+ */
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+bool QTgaFile::canRead(QIODevice *device)
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+{
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+ QByteArray header = device->peek(HeaderSize);
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+ if (header.size() < HeaderSize)
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+ return false;
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+ QBuffer buffer(&header);
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+ QTgaFile tga(&buffer);
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+ return tga.isValid();
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+}
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diff -up qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.h.me qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.h
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--- qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.h.me 2012-03-30 21:58:39.670023189 +0200
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+++ qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgafile.h 2012-03-30 21:59:06.202317384 +0200
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@@ -93,6 +93,8 @@ public:
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inline QSize size() const;
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inline Compression compression() const;
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+ static bool canRead(QIODevice *device);
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+
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private:
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static inline quint16 littleEndianInt(const unsigned char *d);
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diff -up qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgahandler.cpp.me qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgahandler.cpp
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--- qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgahandler.cpp.me 2012-03-30 21:59:17.373303356 +0200
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+++ qt-everywhere-opensource-src-4.8.1/src/plugins/imageformats/tga/qtgahandler.cpp 2012-03-30 22:00:13.817226439 +0200
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@@ -77,8 +77,7 @@ bool QTgaHandler::canRead(QIODevice *dev
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qWarning("QTgaHandler::canRead() called with no device");
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return false;
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}
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- QTgaFile tga(device);
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- return tga.isValid();
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+ return QTgaFile::canRead(device);
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}
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bool QTgaHandler::read(QImage *image)
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