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MACVENTURE: Add metadata to savegames

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Borja Lorente 2016-08-02 12:00:07 +02:00
parent 90b022c078
commit b7b4862e4c
4 changed files with 142 additions and 21 deletions
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engines/macventure/saveload.cpp Normal file
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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 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.
*
*/
#include "macventure/macventure.h"
#include "common/error.h"
#include "common/savefile.h"
#include "engines/savestate.h"
namespace MacVenture {
#define MACVENTURE_SAVE_HEADER MKTAG('M', 'V', 'S', 'S') // (M)ac(V)enture (S)cummVM (S)ave (0x4d565353, uint32)
#define MACVENTURE_SAVE_VERSION 1 //1 BYTE
#define MACVENTURE_DESC_LENGTH 1 //1 BYTE for the description length
SaveStateDescriptor loadMetaData(Common::SeekableReadStream *s, int slot) {
// Metadata is stored at the end of the file
// |DESCRIPTION |
// |HEADER |VERSION|DESCLEN|
s->seek(-(5 + MACVENTURE_DESC_LENGTH), SEEK_END);
uint32 sig = s->readUint32BE();
byte version = s->readByte();
SaveStateDescriptor desc(-1, ""); // init to an invalid save slot
if (sig != MACVENTURE_SAVE_HEADER || version > MACVENTURE_SAVE_VERSION)
return desc;
// Save is valid, set its slot number
desc.setSaveSlot(slot);
// Load the description
Common::String name;
// Depends on MACVENTURE_DESC_LENGTH
byte descSize = s->readByte();
s->seek(-(5 + MACVENTURE_DESC_LENGTH + descSize), SEEK_END);
for (int i = 0; i < descSize; ++i)
name += s->readByte();
desc.setDescription(name);
return desc;
}
void writeMetaData(Common::OutSaveFile *file, Common::String desc) {
if (desc.size() >= (1 << (MACVENTURE_DESC_LENGTH * 4))) {
desc.erase((1 << (MACVENTURE_DESC_LENGTH * 4)) - 1);
}
file->writeString(desc);
file->writeUint32BE(MACVENTURE_SAVE_HEADER);
file->writeByte(MACVENTURE_SAVE_VERSION);
file->writeByte(desc.size());
}
Common::Error MacVentureEngine::loadGameState(int slot) {
Common::InSaveFile *file = getSaveFileManager()->openForLoading("shadowgate.001");
_world->loadGameFrom(file);
reset();
return Common::kNoError;
}
Common::Error MacVentureEngine::saveGameState(int slot, const Common::String &desc) {
Common::SaveFileManager *manager = getSaveFileManager();
// HACK Get a real name!
Common::OutSaveFile *file = manager->openForSaving(desc);
_world->saveGameInto(file);
writeMetaData(file, desc);
delete file;
}
} // End of namespace MacVenture