DETECTOR: Separate code for handling obsolete gameids from advanced detector

This includes a renaming of ADObsoleteGameID to Engine::ObsoleteGameID,
and AdvancedDetector::findGameID now is Engines::findGameID.

Doxygen comments were added or improved

1 files changed, 78 insertions, 0 deletions

diff --git a/engines/obsolete.h b/engines/obsolete.h
new file mode 100644
index 0000000000..97bc7524a6
--- /dev/null
+++ b/engines/obsolete.h
@@ -0,0 +1,78 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef ENGINES_OBSOLETE_H
+#define ENGINES_OBSOLETE_H
+
+#include "engines/game.h"
+
+namespace Engines {
+
+/**
+ * Structure for autoupgrading targets using an obsolete gameid
+ * to the correct new gameid.
+ */
+struct ObsoleteGameID {
+
+	/** Name of the obsolete gameid. */
+	const char *from;
+
+	/** Name of the corresponding new gameid. */
+	const char *to;
+
+	/**
+	 * If platform is set to a value different from Common::kPlatformUnknown,
+	 * then upgradeTargetIfNecessary() will use this value to set the platform
+	 * attribute of any target it updates using this ObsoleteGameID record.
+	 * This is useful when the old gameid encoded the target platform (e.g.
+	 * "zakTowns" for FM-TOWNS) while the new gameid does not (e.g. "zak").
+	 */
+	Common::Platform platform;
+};
+
+/**
+ * Check if the currently active game target has an obsolete gameid;
+ * if so, replace it by the correct new gameid.
+ * This function is typically invoked by a MetaEngine::createInstance
+ * implementation.
+ */
+void upgradeTargetIfNecessary(const ObsoleteGameID *obsoleteList);
+
+
+/**
+ * Scan through the given list of plain game descriptors specified and search
+ * for 'gameid' in there. If a match is found, returns a GameDescriptor
+ * with gameid and description set.
+ *
+ * Optionally can take a list of obsolete game ids into account in order
+ * to support obsolete gameids.
+ */
+GameDescriptor findGameID(
+	const char *gameid,
+	const PlainGameDescriptor *gameids,
+	const ObsoleteGameID *obsoleteList = 0
+	);
+
+
+} // End of namespace Engines
+
+#endif