Initial commit

engines/gob/save/saveconverter_v2.cpp

@@ -0,0 +1,137 @@
+/* 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/>.
+ *
+ *
+ * This file is dual-licensed.
+ * In addition to the GPLv3 license mentioned above, this code is also
+ * licensed under LGPL 2.1. See LICENSES/COPYING.LGPL file for the
+ * full text of the license.
+ *
+ */
+
+#include "common/endian.h"
+#include "common/savefile.h"
+
+#include "gob/gob.h"
+#include "gob/save/saveconverter.h"
+#include "gob/save/savefile.h"
+#include "gob/save/savehandler.h"
+
+namespace Gob {
+
+SaveConverter_v2::SaveConverter_v2(GobEngine *vm, const Common::String &fileName) :
+	SaveConverter(vm, fileName) {
+}
+
+SaveConverter_v2::~SaveConverter_v2() {
+}
+
+int SaveConverter_v2::isOldSave(Common::InSaveFile **save) const {
+	uint32 varSize = SaveHandler::getVarSize(_vm);
+	if (varSize == 0)
+		return 0;
+
+	uint32 saveSize = getActualSize(save);
+	if (saveSize == 0)
+		return 0;
+
+	// The size of the old save always follows that rule
+	if (saveSize == (varSize * 2 + kSlotNameLength * 2))
+		return 1;
+
+	// Not an old save, clean up
+	if (save) {
+		delete *save;
+		*save = nullptr;
+	}
+
+	return 0;
+}
+
+char *SaveConverter_v2::getDescription(Common::SeekableReadStream &save) const {
+	char *desc = new char[kSlotNameLength];
+
+	// Read the description
+	if (save.read(desc, kSlotNameLength) != kSlotNameLength) {
+		delete[] desc;
+		return nullptr;
+	}
+
+	return desc;
+}
+
+bool SaveConverter_v2::loadFail(SavePartInfo *info, SavePartVars *vars,
+		Common::InSaveFile *save) {
+
+	delete info;
+	delete vars;
+	delete save;
+
+	clear();
+
+	return false;
+}
+
+// Loads the old save by constructing a new save containing the old save's data
+bool SaveConverter_v2::load() {
+	clear();
+
+	uint32 varSize = SaveHandler::getVarSize(_vm);
+	if (varSize == 0)
+		return false;
+
+	Common::InSaveFile *save;
+
+	// Test if it's an old savd
+	if (!isOldSave(&save) || !save)
+		return false;
+
+	displayWarning();
+
+	SaveWriter writer(2, 0);
+
+	SavePartInfo *info = readInfo(*save, kSlotNameLength);
+	if (!info)
+		return loadFail(nullptr, nullptr, save);
+
+	SavePartVars *vars = readVars(*save, varSize, true);
+	if (!vars)
+		return loadFail(info, nullptr, save);
+
+	// We don't need the save anymore
+	delete save;
+
+	// Write all parts
+	if (!writer.writePart(0, info))
+		return loadFail(info, vars, nullptr);
+	if (!writer.writePart(1, vars))
+		return loadFail(info, vars, nullptr);
+
+	// We don't need those anymore
+	delete info;
+	delete vars;
+
+	// Create the final read stream
+	if (!createStream(writer))
+		return loadFail(nullptr, nullptr, nullptr);
+
+	return true;
+}
+
+} // End of namespace Gob