GLK: ALAN3: Add detection logic

1 files changed, 106 insertions, 0 deletions

diff --git a/engines/glk/alan3/detection.cpp b/engines/glk/alan3/detection.cpp
new file mode 100644
index 0000000000..cafc426151
--- /dev/null
+++ b/engines/glk/alan3/detection.cpp
@@ -0,0 +1,106 @@
+/* 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.
+ *
+ */
+
+#include "glk/alan3/detection.h"
+#include "glk/alan3/detection_tables.h"
+#include "common/debug.h"
+#include "common/file.h"
+#include "common/md5.h"
+#include "engines/game.h"
+
+namespace Glk {
+namespace Alan3 {
+
+void Alan3MetaEngine::getSupportedGames(PlainGameList &games) {
+	for (const PlainGameDescriptor *pd = ALAN3_GAME_LIST; pd->gameId; ++pd) {
+		games.push_back(*pd);
+	}
+}
+
+GameDescriptor Alan3MetaEngine::findGame(const char *gameId) {
+	for (const PlainGameDescriptor *pd = ALAN3_GAME_LIST; pd->gameId; ++pd) {
+		if (!strcmp(gameId, pd->gameId))
+			return *pd;
+	}
+
+	return GameDescriptor::empty();
+}
+
+bool Alan3MetaEngine::detectGames(const Common::FSList &fslist, DetectedGames &gameList) {
+	// 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 = filename.hasSuffix(".a3c");
+		if (!hasExt)
+			continue;
+
+		// Open up the file and calculate the md5
+		Common::File gameFile;
+		if (!gameFile.open(*file) || gameFile.readUint32BE() != MKTAG('A', 'L', 'A', 'N'))
+			continue;
+
+		gameFile.seek(0);
+		Common::String md5 = Common::computeStreamMD5AsString(gameFile, 5000);
+		size_t filesize = gameFile.size();
+		gameFile.close();
+
+		// Check for known games
+		const Alan3GameDescription *p = ALAN3_GAMES;
+		while (p->_gameId && (md5 != p->_md5 || filesize != p->_filesize))
+			++p;
+
+		DetectedGame gd;
+		if (!p->_gameId) {
+			const PlainGameDescriptor &desc = ALAN3_GAME_LIST[0];
+			gd = DetectedGame(desc.gameId, desc.description, Common::UNK_LANG, Common::kPlatformUnknown);
+			gd.canBeAdded = true;
+			gd.hasUnknownFiles = true;
+			FileProperties fp;
+			fp.md5 = md5;
+			fp.size = filesize;
+			gd.matchedFiles[filename] = fp;
+
+		} else {
+			PlainGameDescriptor gameDesc = findGame(p->_gameId);
+			gd = DetectedGame(p->_gameId, gameDesc.description, Common::EN_ANY, Common::kPlatformUnknown);
+		}
+
+		gd.addExtraEntry("filename", filename);
+		gameList.push_back(gd);
+	}
+
+	return !gameList.empty();
+}
+
+void Alan3MetaEngine::detectClashes(Common::StringMap &map) {
+	for (const PlainGameDescriptor *pd = ALAN3_GAME_LIST; pd->gameId; ++pd) {
+		if (map.contains(pd->gameId))
+			error("Duplicate game Id found - %s", pd->gameId);
+		map[pd->gameId] = "";
+	}
+}
+
+} // End of namespace Alan3
+} // End of namespace Glk