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engines/glk/magnetic/detection.cpp

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+/* 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 3 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, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "glk/magnetic/detection.h"
+#include "glk/magnetic/detection_tables.h"
+#include "common/debug.h"
+#include "common/file.h"
+#include "common/md5.h"
+#include "engines/game.h"
+
+namespace Glk {
+namespace Magnetic {
+
+void MagneticMetaEngine::getSupportedGames(PlainGameList &games) {
+	for (const PlainGameDescriptor *pd = MAGNETIC_GAME_LIST; pd->gameId; ++pd) {
+		games.push_back(*pd);
+	}
+}
+
+const GlkDetectionEntry* MagneticMetaEngine::getDetectionEntries() {
+	return MAGNETIC_GAMES;
+}
+
+GameDescriptor MagneticMetaEngine::findGame(const char *gameId) {
+	for (const PlainGameDescriptor *pd = MAGNETIC_GAME_LIST; pd->gameId; ++pd) {
+		if (!strcmp(gameId, pd->gameId))
+			return *pd;
+	}
+
+	return PlainGameDescriptor::empty();
+}
+
+bool MagneticMetaEngine::detectGames(const Common::FSList &fslist, DetectedGames &gameList) {
+	const char *const EXTENSIONS[] = { ".mag", ".rsc", nullptr };
+
+	// Loop through the files of the folder
+	for (Common::FSList::const_iterator file = fslist.begin(); file != fslist.end(); ++file) {
+		// Check for a recognised filename
+		if (file->isDirectory())
+			continue;
+		Common::String filename = file->getName();
+		bool hasExt = false;
+		for (const char *const *ext = &EXTENSIONS[0]; *ext && !hasExt; ++ext)
+			hasExt = filename.hasSuffixIgnoreCase(*ext);
+		if (!hasExt)
+			continue;
+
+		// Open up the file and calculate the md5
+		Common::File gameFile;
+		if (!gameFile.open(*file))
+			continue;
+		if (gameFile.readUint32BE() != MKTAG('M', 'a', 'S', 'c')) {
+			gameFile.close();
+			continue;
+		}
+
+		gameFile.seek(0);
+		Common::String md5 = Common::computeStreamMD5AsString(gameFile, 5000);
+		size_t filesize = gameFile.size();
+		gameFile.close();
+
+		// Check for known games
+		const GlkDetectionEntry *p = MAGNETIC_GAMES;
+		while (p->_gameId && (md5 != p->_md5 || filesize != p->_filesize))
+			++p;
+
+		if (!p->_gameId) {
+			const PlainGameDescriptor &desc = MAGNETIC_GAME_LIST[0];
+			gameList.push_back(GlkDetectedGame(desc.gameId, desc.description, filename, md5, filesize));
+		} else {
+			PlainGameDescriptor gameDesc = findGame(p->_gameId);
+			gameList.push_back(GlkDetectedGame(p->_gameId, gameDesc.description, p->_extra, filename, p->_language));
+		}
+	}
+
+	return !gameList.empty();
+}
+
+void MagneticMetaEngine::detectClashes(Common::StringMap &map) {
+	for (const PlainGameDescriptor *pd = MAGNETIC_GAME_LIST; pd->gameId; ++pd) {
+		if (map.contains(pd->gameId))
+			error("Duplicate game Id found - %s", pd->gameId);
+		map[pd->gameId] = "";
+	}
+}
+
+const gms_game_table_t *gms_gameid_lookup_game(uint32 undo_size, uint32 undo_pc) {
+	const gms_game_table_t *game;
+
+	for (game = GMS_GAME_TABLE; game->name; game++) {
+		if (game->undo_size == undo_size && game->undo_pc == undo_pc)
+			break;
+	}
+
+	return game->name ? game : nullptr;
+}
+
+} // End of namespace Magnetic
+} // End of namespace Glk