Initial commit

engines/m4/metaengine.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 "common/translation.h"
+#include "common/savefile.h"
+#include "common/system.h"
+
+#include "m4/metaengine.h"
+#include "m4/detection.h"
+#include "m4/burger/burger.h"
+#include "m4/riddle/riddle.h"
+
+namespace M4 {
+
+static const ADExtraGuiOptionsMap optionsList[] = {
+	{
+		GAMEOPTION_ORIGINAL_SAVELOAD,
+		{
+			_s("Use original save/load screens"),
+			_s("Use the original save/load screens instead of the ScummVM ones"),
+			"original_menus",
+			false,
+			0,
+			0
+		}
+	},
+	AD_EXTRA_GUI_OPTIONS_TERMINATOR
+};
+
+} // End of namespace M4
+
+const char *M4MetaEngine::getName() const {
+	return "m4";
+}
+
+const ADExtraGuiOptionsMap *M4MetaEngine::getAdvancedExtraGuiOptions() const {
+	return M4::optionsList;
+}
+
+Common::Error M4MetaEngine::createInstance(OSystem *syst, Engine **engine, const M4::M4GameDescription *gd) const {
+	switch (gd->gameType) {
+	case M4::GType_Burger:
+		*engine = new M4::Burger::BurgerEngine(syst, gd);
+		break;
+	case M4::GType_Riddle:
+		*engine = new M4::Riddle::RiddleEngine(syst, gd);
+		break;
+	default:
+		return Common::kUnsupportedGameidError;
+	}
+
+	return Common::kNoError;
+}
+
+bool M4MetaEngine::hasFeature(MetaEngineFeature f) const {
+	return checkExtendedSaves(f) ||
+		(f == kSupportsLoadingDuringStartup);
+}
+
+SaveStateDescriptor M4MetaEngine::querySaveMetaInfos(const char *target, int slot) const {
+	Common::String saveName = Common::String::format("%s.%03u", target, slot);
+	Common::InSaveFile *save = getOriginalSave(saveName);
+
+	if (save) {
+		save->skip(4);
+		char saveDesc[32];
+		save->read(saveDesc, 32);
+		saveDesc[31] = '\0';
+		delete save;
+
+		SaveStateDescriptor desc(this, slot, saveDesc);
+		return desc;
+	} else {
+		return AdvancedMetaEngine::querySaveMetaInfos(target, slot);
+	}
+}
+
+Common::InSaveFile *M4MetaEngine::getOriginalSave(const Common::String &saveName) const {
+	Common::InSaveFile *save = g_system->getSavefileManager()->openForLoading(saveName);
+	char name[16];
+
+	if (save) {
+		if (save->seek(-44, SEEK_END) && save->read(name, 7) == 7 &&
+			!strncmp(name, "MIRROR", 7)) {
+			save->seek(0);
+			return save;
+		} else if (save->seek(-44, SEEK_END) && save->read(name, 7) == 7 &&
+			!strncmp(name, "FAUCET ", 7)) {
+			save->seek(0);
+			return save;
+		}
+
+		delete save;
+	}
+
+	return nullptr;
+}
+
+void M4MetaEngine::getSavegameThumbnail(Graphics::Surface &thumb) {
+	if (!_thumbnail)
+		return AdvancedMetaEngine::getSavegameThumbnail(thumb);
+
+	thumb.copyFrom(*_thumbnail);
+}
+
+#if PLUGIN_ENABLED_DYNAMIC(M4)
+REGISTER_PLUGIN_DYNAMIC(M4, PLUGIN_TYPE_ENGINE, M4MetaEngine);
+#else
+REGISTER_PLUGIN_STATIC(M4, PLUGIN_TYPE_ENGINE, M4MetaEngine);
+#endif