Added support for Geotagged JPEG files

src/common/tifffile.cpp

@@ -0,0 +1,26 @@
+#include "tifffile.h"
+
+#define TIFF_II     0x4949
+#define TIFF_MM     0x4D4D
+#define TIFF_MAGIC  42
+
+TIFFFile::TIFFFile(QIODevice *device) : _device(device), _ifd(0)
+{
+	quint16 endian, magic;
+
+	if (_device->read((char*)&endian, sizeof(endian)) < (qint64)sizeof(endian))
+		return;
+	if (endian == TIFF_II)
+		_be = false;
+	else if (endian == TIFF_MM)
+		_be = true;
+	else
+		return;
+
+	if (!readValue(magic))
+		return;
+	if (magic != TIFF_MAGIC)
+		return;
+	if (!readValue(_ifd))
+		return;
+}

src/common/tifffile.h

@@ -0,0 +1,55 @@
+#ifndef TIFFFILE_H
+#define TIFFFILE_H
+
+#include <QIODevice>
+#include <QtEndian>
+
+#define TIFF_BYTE      1
+#define TIFF_ASCII     2
+#define TIFF_SHORT     3
+#define TIFF_LONG      4
+#define TIFF_RATIONAL  5
+#define TIFF_DOUBLE    12
+
+class TIFFFile
+{
+public:
+	TIFFFile(QIODevice *device);
+
+	bool isValid() const {return _ifd != 0;}
+	quint32 ifd() const {return _ifd;}
+
+	bool seek(qint64 pos) {return _device->seek(pos);}
+	qint64 pos() const {return _device->pos();}
+	template<class T> bool readValue(T &val)
+	{
+		T data;
+
+		if (_device->read((char*)&data, sizeof(T)) < (qint64)sizeof(T))
+			return false;
+
+#if Q_BYTE_ORDER == Q_BIG_ENDIAN
+			if (_be)
+				val = data;
+			else {
+				for (size_t i = 0; i < sizeof(T); i++)
+					*((char *)&val + i) = *((char*)&data + sizeof(T) - 1 - i);
+			}
+#else
+			if (_be) {
+				for (size_t i = 0; i < sizeof(T); i++)
+					*((char *)&val + i) = *((char*)&data + sizeof(T) - 1 - i);
+			} else
+				val = data;
+#endif
+
+		return true;
+	}
+
+private:
+	QIODevice *_device;
+	bool _be;
+	quint32 _ifd;
+};
+
+#endif // TIFFFILE_H