Add currently existing PackageKit backend

backend/slackpkg.h

@@ -0,0 +1,30 @@
+#ifndef __SLACK_SLACKPKG_H
+#define __SLACK_SLACKPKG_H
+
+#include <cstddef>
+#include "pkgtools.h"
+
+namespace slack {
+
+class Slackpkg final : public Pkgtools
+{
+public:
+	Slackpkg (const gchar *name, const gchar *mirror,
+			guint8 order, const gchar *blacklist, gchar **priority) noexcept;
+	~Slackpkg () noexcept;
+
+	GSList *collect_cache_info (const gchar *tmpl) noexcept;
+	void generate_cache (PkBackendJob *job, const gchar *tmpl) noexcept;
+
+private:
+	static GHashTable *cat_map;
+	static const std::size_t max_buf_size = 8192;
+	gchar **priority = NULL;
+
+	void manifest (PkBackendJob *job,
+			const gchar *tmpl, gchar *filename) noexcept;
+};
+
+}
+
+#endif /* __SLACK_SLACKPKG_H */