Initial commit

engines/illusions/saveload.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/savefile.h"
+
+#include "graphics/thumbnail.h"
+
+#include "illusions/illusions.h"
+#include "illusions/gamestate.h"
+
+namespace Illusions {
+
+#define ILLUSIONS_SAVEGAME_VERSION 0
+
+IllusionsEngine::kReadSaveHeaderError IllusionsEngine::readSaveHeader(Common::SeekableReadStream *in, SaveHeader &header, bool skipThumbnail) {
+
+	header.version = in->readUint32LE();
+	if (header.version > ILLUSIONS_SAVEGAME_VERSION)
+		return kRSHEInvalidVersion;
+
+	byte descriptionLen = in->readByte();
+	header.description = "";
+	while (descriptionLen--) {
+		header.description += (char)in->readByte();
+	}
+
+	if (!Graphics::loadThumbnail(*in, header.thumbnail, skipThumbnail)) {
+		return kRSHEIoError;
+	}
+
+	// Not used yet, reserved for future usage
+	header.gameID = in->readByte();
+	header.flags = in->readUint32LE();
+
+	header.saveDate = in->readUint32LE();
+	header.saveTime = in->readUint32LE();
+	header.playTime = in->readUint32LE();
+
+	return ((in->eos() || in->err()) ? kRSHEIoError : kRSHENoError);
+}
+
+bool IllusionsEngine::savegame(const char *filename, const char *description) {
+
+	Common::OutSaveFile *out;
+	if (!(out = g_system->getSavefileManager()->openForSaving(filename))) {
+		warning("Can't create file '%s', game not saved", filename);
+		return false;
+	}
+
+	TimeDate curTime;
+	g_system->getTimeAndDate(curTime);
+
+	// Header start
+	out->writeUint32LE(ILLUSIONS_SAVEGAME_VERSION);
+
+	byte descriptionLen = strlen(description);
+	out->writeByte(descriptionLen);
+	out->write(description, descriptionLen);
+
+	// TODO Probably pre-generate the thumbnail before the internal menu system is
+	// called to have a thumbnail without the menu system itself on it.
+	// Use the automatic thumbnail generation only when the ScummVM save dialog is used.
+	Graphics::saveThumbnail(*out);
+
+	// Not used yet, reserved for future usage
+	out->writeByte(0);
+	out->writeUint32LE(0);
+	uint32 saveDate = ((curTime.tm_mday & 0xFF) << 24) | (((curTime.tm_mon + 1) & 0xFF) << 16) | ((curTime.tm_year + 1900) & 0xFFFF);
+	uint32 saveTime = ((curTime.tm_hour & 0xFF) << 16) | (((curTime.tm_min) & 0xFF) << 8) | ((curTime.tm_sec) & 0xFF);
+	uint32 playTime = g_engine->getTotalPlayTime() / 1000;
+	out->writeUint32LE(saveDate);
+	out->writeUint32LE(saveTime);
+	out->writeUint32LE(playTime);
+	// Header end
+
+	_gameState->write(out);
+
+	out->finalize();
+	delete out;
+	return true;
+}
+
+bool IllusionsEngine::loadgame(const char *filename) {
+	Common::InSaveFile *in;
+	if (!(in = g_system->getSavefileManager()->openForLoading(filename))) {
+		warning("Can't open file '%s', game not loaded", filename);
+		return false;
+	}
+
+	SaveHeader header;
+
+	kReadSaveHeaderError errorCode = readSaveHeader(in, header);
+
+	if (errorCode != kRSHENoError) {
+		warning("Error loading savegame '%s'", filename);
+		delete in;
+		return false;
+	}
+
+	g_engine->setTotalPlayTime(header.playTime * 1000);
+
+	_gameState->read(in);
+
+	delete in;
+	return true;
+}
+
+Common::Error IllusionsEngine::loadGameState(int slot) {
+	_resumeFromSavegameRequested = false;
+	Common::String fileName = getSavegameFilename(_targetName, slot);
+	if (!loadgame(fileName.c_str()))
+		return Common::kReadingFailed;
+	_resumeFromSavegameRequested = true;
+	_savegameSlotNum = slot;
+	return Common::kNoError;
+}
+
+Common::Error IllusionsEngine::saveGameState(int slot, const Common::String &description, bool isAutosave) {
+	Common::String fileName = getSavegameFilename(_targetName, slot);
+	if (!savegame(fileName.c_str(), description.c_str()))
+		return Common::kWritingFailed;
+	return Common::kNoError;
+}
+
+Common::Error IllusionsEngine::removeGameState(int slot) {
+	Common::SaveFileManager *saveFileMan = g_system->getSavefileManager();
+	Common::String filename = getSavegameFilename(_targetName, slot);
+	saveFileMan->removeSavefile(filename.c_str());
+	return Common::kNoError;
+}
+
+Common::String IllusionsEngine::getSavegameFilename(const Common::String &target, int num) {
+	assert(num >= 0 && num <= 999);
+	return Common::String::format("%s.%03d", target.c_str(), num);
+}
+
+} // End of namespace Illusions