- A new save system for the GobEngine, one that is not fundamentally broken and is versioned. Unfortunately, this invalidates most save games created on big-endian machines, since endian-issues was a main problem with the old system

- Removed the now superfluous variables sizes

svn-id: r41056

1 files changed, 147 insertions, 0 deletions

diff --git a/engines/gob/save/saveconverter_v4.cpp b/engines/gob/save/saveconverter_v4.cpp
new file mode 100644
index 0000000000..23273446d1
--- /dev/null
+++ b/engines/gob/save/saveconverter_v4.cpp
@@ -0,0 +1,147 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#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_v4::SaveConverter_v4(GobEngine *vm, const char *fileName) :
+	SaveConverter(vm, fileName) {
+}
+
+SaveConverter_v4::~SaveConverter_v4() {
+}
+
+int SaveConverter_v4::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 + 1000 + 512000))
+		return 1;
+
+	// Not an old save, clean up
+	if (save) {
+		delete *save;
+		*save = 0;
+	}
+
+	return 0;
+}
+
+char *SaveConverter_v4::getDescription(Common::SeekableReadStream &save) const {
+	// The description starts at 1000
+	if (!save.seek(1000))
+		return 0;
+
+	char *desc = new char[kSlotNameLength];
+
+	// Read the description
+	if (save.read(desc, kSlotNameLength) != kSlotNameLength) {
+		delete desc;
+		return 0;
+	}
+
+	return desc;
+}
+
+bool SaveConverter_v4::loadFail(SavePartInfo *info, SavePartVars *vars,
+		SavePartMem *props, Common::InSaveFile *save) {
+
+	delete info;
+	delete vars;
+	delete props;
+	delete save;
+
+	clear();
+
+	return false;
+}
+
+// Loads the old save by constructing a new save containing the old save's data
+bool SaveConverter_v4::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(3, 0);
+
+	SavePartInfo *info = readInfo(*save, kSlotNameLength, false);
+	if (!info)
+		return loadFail(0, 0, 0, save);
+
+	SavePartVars *vars = readVars(*save, varSize, true);
+	if (!vars)
+		return loadFail(info, 0, 0, save);
+
+	SavePartMem *props = readMem(*save, 256000, true);
+	if (!props)
+		return loadFail(info, vars, 0, save);
+
+	// We don't need the save anymore
+	delete save;
+
+	// Write all parts
+	if (!writer.writePart(0, info))
+		return loadFail(info, vars, props, 0);
+	if (!writer.writePart(1, vars))
+		return loadFail(info, vars, props, 0);
+	if (!writer.writePart(2, props))
+		return loadFail(info, vars, props, 0);
+
+	// We don't need those anymore
+	delete info;
+	delete vars;
+	delete props;
+
+	// Create the final read stream
+	if (!createStream(writer))
+		return loadFail(0, 0, 0, 0);
+
+	return true;
+}
+
+} // End of namespace Gob