blame: src/exifreader.cpp

#include "exifreader.h"

#include <QFileInfo>

#include <QImageReader>

#include <exiv2/exiv2.hpp>

// Raw EXIF date format is "YYYY:MM:DD HH:MM:SS"; reformat date separators to dashes

static QString formatDate(const QString &raw)

{

    if (raw.size() >= 10 && raw[4] == u':' && raw[7] == u':')

        return raw.left(4) + u'-' + raw.mid(5, 2) + u'-' + raw.mid(8, 2) + raw.mid(10);

    return raw;

}

static QString findTag(const Exiv2::ExifData &exif, const std::string &key)

{

    try {

        Exiv2::ExifData::const_iterator it = exif.findKey(Exiv2::ExifKey(key));

        if (it != exif.end())

            return QString::fromStdString(it->print(&exif)).trimmed();

    } catch (...) {}

    return {};

}

static void addField(QList<QPair<QString, QString>> &result, const char *label, const QString &value)

{

    if (!value.isEmpty())

        result.append({QString::fromLatin1(label), value});

}

bool ExifData::isEmpty() const

{

    return dateTime.isEmpty() && make.isEmpty() && model.isEmpty()

        && exposureTime.isEmpty() && fNumber.isEmpty() && iso.isEmpty()

        && focalLength.isEmpty() && flash.isEmpty()

        && dimensions.isEmpty() && fileSize.isEmpty();

}

QList<QPair<QString, QString>> ExifData::toList() const

{

    QList<QPair<QString, QString>> result;

    addField(result, "Date/Time",    dateTime);

    addField(result, "Camera Make",  make);

    addField(result, "Camera Model", model);

    addField(result, "Exposure",     exposureTime);

    addField(result, "Aperture",     fNumber);

    addField(result, "ISO",          iso);

    addField(result, "Focal Length", focalLength);

    addField(result, "Flash",        flash);

    addField(result, "Dimensions",   dimensions);

    addField(result, "File Size",    fileSize);

    return result;

}

ExifData ExifReader::read(const QString &path)

{

    ExifData data;

    QFileInfo fi(path);

    if (!fi.exists() || fi.isDir())

        return data;

    // File size

    {

        qint64 size = fi.size();

        if (size < 1024)

            data.fileSize = QString::number(size) + QLatin1String(" B");

        else if (size < 1024 * 1024)

            data.fileSize = QString::number(size / 1024.0, 'f', 1) + QLatin1String(" KiB");

        else

            data.fileSize = QString::number(size / (1024.0 * 1024.0), 'f', 1) + QLatin1String(" MiB");

    }

    // Image dimensions via Qt (reads only the header, no full decode needed)

    {

        QImageReader reader(path);

        reader.setDecideFormatFromContent(true);

        QSize sz = reader.size();

        if (sz.isValid())

            data.dimensions = QString::fromLatin1("%1 * %2")

                                  .arg(sz.width()).arg(sz.height());

    }

    // EXIF tags via exiv2

    try {

        std::unique_ptr<Exiv2::Image> image = Exiv2::ImageFactory::open(path.toStdString());

        image->readMetadata();

        const Exiv2::ExifData &exif = image->exifData();

        data.dateTime = formatDate(findTag(exif, "Exif.Photo.DateTimeOriginal"));

        if (data.dateTime.isEmpty())

            data.dateTime = formatDate(findTag(exif, "Exif.Image.DateTime"));

        data.make         = findTag(exif, "Exif.Image.Make");

        data.model        = findTag(exif, "Exif.Image.Model");

        data.exposureTime = findTag(exif, "Exif.Photo.ExposureTime");

        data.fNumber      = findTag(exif, "Exif.Photo.FNumber");

        data.iso          = findTag(exif, "Exif.Photo.ISOSpeedRatings");

        data.focalLength  = findTag(exif, "Exif.Photo.FocalLength");

        data.flash        = findTag(exif, "Exif.Photo.Flash");

    } catch (const Exiv2::Error &) {

        // No EXIF or unsupported format — leave tags empty

    }

    return data;

}