Implement all boilerplate concerning Global Main Menu.

All currently defined featues will be supported.  I have implemented 
everything boilerplatish, except for the actual game saving/loading (which
will come in the next commit), getting volumes from the configuration
(because we don't play sounds yet), and changing subtitles.

svn-id: r44583

1 files changed, 155 insertions, 0 deletions

diff --git a/engines/draci/saveload.cpp b/engines/draci/saveload.cpp
new file mode 100644
index 0000000000..bd2f247dd4
--- /dev/null
+++ b/engines/draci/saveload.cpp
@@ -0,0 +1,155 @@
+/* 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: https://scummvm.svn.sourceforge.net/svnroot/scummvm/scummvm/trunk/engines/cruise/saveload.cpp $
+ * $Id: saveload.cpp 42047 2009-07-03 06:19:20Z dreammaster $
+ *
+ */
+
+#include <time.h>	// for extended infos
+
+#include "draci/draci.h"
+#include "draci/saveload.h"
+
+#include "common/serializer.h"
+#include "common/savefile.h"
+#include "common/system.h"
+
+#include "graphics/scaler.h"
+#include "graphics/thumbnail.h"
+
+namespace Draci {
+
+static const char *draciIdentString = "DRACI";
+
+bool readSavegameHeader(Common::InSaveFile *in, DraciSavegameHeader &header) {
+	char saveIdentBuffer[6];
+	header.thumbnail = NULL;
+
+	// Validate the header Id
+	in->read(saveIdentBuffer, 6);
+	if (strcmp(saveIdentBuffer, draciIdentString))
+		return false;
+
+	header.version = in->readByte();
+	if (header.version != DRACI_SAVEGAME_VERSION)
+		return false;
+
+	// Read in the string
+	header.saveName.clear();
+	char ch;
+	while ((ch = (char)in->readByte()) != '\0') header.saveName += ch;
+
+	header.date = in->readUint32LE();
+	header.time = in->readUint16LE();
+	header.playtime = in->readUint32LE();
+
+	// Get the thumbnail
+	header.thumbnail = new Graphics::Surface();
+	if (!Graphics::loadThumbnail(*in, *header.thumbnail)) {
+		delete header.thumbnail;
+		header.thumbnail = NULL;
+		return false;
+	}
+
+	return true;
+}
+
+void writeSavegameHeader(Common::OutSaveFile *out, const DraciSavegameHeader &header, const Graphics::Surface &thumb) {
+	// Write out a savegame header
+	out->write(draciIdentString, 6);
+	out->writeByte(DRACI_SAVEGAME_VERSION);
+
+	// Write savegame name
+	out->write(header.saveName.c_str(), header.saveName.size() + 1);
+
+	out->writeUint32BE(header.date);
+	out->writeUint16BE(header.time);
+	out->writeUint32BE(header.playtime);
+
+	// Create a thumbnail and save it
+	Graphics::saveThumbnail(*out, thumb);
+}
+
+static void DoSync(Common::Serializer &s) {
+}
+
+
+Common::Error saveSavegameData(int saveGameIdx, const Common::String &saveName, const DraciEngine &vm) {
+	const char *filename = vm.getSavegameFile(saveGameIdx);
+	Common::SaveFileManager *saveMan = g_system->getSavefileManager();
+	Common::OutSaveFile *f = saveMan->openForSaving(filename);
+	if (f == NULL)
+		return Common::kNoGameDataFoundError;
+
+	tm curTime;
+	vm._system->getTimeAndDate(curTime);
+
+	// Save the savegame header
+	DraciSavegameHeader header;
+	header.saveName = saveName;
+	header.date = ((curTime.tm_mday & 0xFF) << 24) | (((curTime.tm_mon + 1) & 0xFF) << 16) | ((curTime.tm_year + 1900) & 0xFFFF);
+	header.time = ((curTime.tm_hour & 0xFF) << 8) | ((curTime.tm_min) & 0xFF);
+	header.playtime = vm._system->getMillis() / 1000 - vm._engineStartTime;
+	writeSavegameHeader(f, header, *vm._screen->getSurface());
+
+	if (f->err()) {
+		delete f;
+		saveMan->removeSavefile(filename);
+		return Common::kWritingFailed;
+	} else {
+		// Create the remainder of the savegame
+		Common::Serializer s(NULL, f);
+		DoSync(s);
+
+		f->finalize();
+		delete f;
+		return Common::kNoError;
+	}
+}
+
+Common::Error loadSavegameData(int saveGameIdx, DraciEngine *vm) {
+	Common::String saveName;
+
+	Common::SaveFileManager *saveMan = g_system->getSavefileManager();
+	Common::InSaveFile *f = saveMan->openForLoading(vm->getSavegameFile(saveGameIdx));
+
+	if (f == NULL) {
+		return Common::kNoGameDataFoundError;
+	}
+
+	// Skip over the savegame header
+	DraciSavegameHeader header;
+	readSavegameHeader(f, header);
+	if (header.thumbnail) delete header.thumbnail;
+
+	// Synchronise the remaining data of the savegame
+	Common::Serializer s(f, NULL);
+	DoSync(s);
+
+	delete f;
+
+	// Post processing
+	vm->_engineStartTime = vm->_system->getMillis() / 1000 - header.playtime;
+
+	return Common::kNoError;
+}
+
+} // End of namespace Draci