IFF: read only support to Interchange Format Files

Read-only support for most common Interchange Format Files (IFF). Supports IFF saved by Photoshop for the Amiga and Maya platform and HAM6 coded files.

Closes #29

src/imageformats/iff_p.h

@@ -0,0 +1,47 @@
+/*
+    This file is part of the KDE project
+    SPDX-FileCopyrightText: 2025 Mirco Miranda <mircomir@outlook.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KIMG_IFF_P_H
+#define KIMG_IFF_P_H
+
+#include <QImageIOPlugin>
+#include <QScopedPointer>
+
+class IFFHandlerPrivate;
+class IFFHandler : public QImageIOHandler
+{
+public:
+    IFFHandler();
+
+    bool canRead() const override;
+    bool read(QImage *image) override;
+
+    bool supportsOption(QImageIOHandler::ImageOption option) const override;
+    QVariant option(QImageIOHandler::ImageOption option) const override;
+
+    static bool canRead(QIODevice *device);
+
+private:
+    bool readStandardImage(QImage *image);
+
+    bool readMayaImage(QImage *image);
+
+private:
+    const QScopedPointer<IFFHandlerPrivate> d;
+};
+
+class IFFPlugin : public QImageIOPlugin
+{
+    Q_OBJECT
+    Q_PLUGIN_METADATA(IID "org.qt-project.Qt.QImageIOHandlerFactoryInterface" FILE "iff.json")
+
+public:
+    Capabilities capabilities(QIODevice *device, const QByteArray &format) const override;
+    QImageIOHandler *create(QIODevice *device, const QByteArray &format = QByteArray()) const override;
+};
+
+#endif // KIMG_IFF_P_H