feat: use libexiv2 to obtain more image metadata

app/exiv2wrapper.cpp

@@ -0,0 +1,100 @@
+#include "exiv2wrapper.h"
+
+#ifdef HAVE_EXIV2_VERSION
+#include <exiv2/exiv2.hpp>
+#else // HAVE_EXIV2_VERSION
+namespace Exiv2 {
+class Image {};
+}
+#endif // HAVE_EXIV2_VERSION
+
+#include <sstream>
+
+#include <QFile>
+#include <QDebug>
+
+Exiv2Wrapper::Exiv2Wrapper()
+{
+
+}
+
+Exiv2Wrapper::~Exiv2Wrapper()
+{
+
+}
+
+template<typename Collection, typename Iterator>
+void Exiv2Wrapper::cacheSection(Collection collection)
+{
+    const Collection& exifData = collection;
+    Iterator it = exifData.begin(), end = exifData.end();
+    for (; it != end; ++it) {
+        QString key = QString::fromUtf8(it->key().c_str());
+        QString label = QString::fromLocal8Bit(it->tagLabel().c_str());
+        std::ostringstream stream;
+        stream << *it;
+        QString value = QString::fromLocal8Bit(stream.str().c_str());
+        m_metadataValue.insert(key, value);
+        m_metadataLabel.insert(key, label);
+
+        qDebug() << key << label << value;
+    }
+}
+
+bool Exiv2Wrapper::load(const QString &filePath)
+{
+#ifdef HAVE_EXIV2_VERSION
+    QByteArray filePathByteArray = QFile::encodeName(filePath);
+    try {
+        m_exivImage.reset(Exiv2::ImageFactory::open(filePathByteArray.constData()).release());
+        m_exivImage->readMetadata();
+    } catch (const Exiv2::Error& error) {
+        m_errMsg = QString::fromUtf8(error.what());
+        return false;
+    }
+    return true;
+#else // HAVE_EXIV2_VERSION
+    Q_UNUSED(filePath);
+    return false;
+#endif // HAVE_EXIV2_VERSION
+}
+
+void Exiv2Wrapper::cacheSections()
+{
+#ifdef HAVE_EXIV2_VERSION
+    if (m_exivImage->checkMode(Exiv2::mdExif) & Exiv2::amRead) {
+        cacheSection<Exiv2::ExifData, Exiv2::ExifData::const_iterator>(m_exivImage->exifData());
+    }
+
+    if (m_exivImage->checkMode(Exiv2::mdIptc) & Exiv2::amRead) {
+        cacheSection<Exiv2::IptcData, Exiv2::IptcData::const_iterator>(m_exivImage->iptcData());
+    }
+
+    if (m_exivImage->checkMode(Exiv2::mdXmp) & Exiv2::amRead) {
+        cacheSection<Exiv2::XmpData, Exiv2::XmpData::const_iterator>(m_exivImage->xmpData());
+    }
+
+//    qDebug() << m_metadataValue;
+//    qDebug() << m_metadataLabel;
+#endif // HAVE_EXIV2_VERSION
+}
+
+QString Exiv2Wrapper::comment() const
+{
+#ifdef HAVE_EXIV2_VERSION
+    return m_exivImage->comment().c_str();
+#else // HAVE_EXIV2_VERSION
+    return QString();
+#endif // HAVE_EXIV2_VERSION
+}
+
+QString Exiv2Wrapper::label(const QString &key) const
+{
+    return m_metadataLabel.value(key);
+}
+
+QString Exiv2Wrapper::value(const QString &key) const
+{
+    return m_metadataValue.value(key);
+}
+