thewitchersavefile.cpp

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/* xoreos - A reimplementation of BioWare's Aurora engine
 *
 * xoreos is the legal property of its developers, whose names
 * can be found in the AUTHORS file distributed with this source
 * distribution.
 *
 * xoreos 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.
 *
 * xoreos 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 xoreos. If not, see <http://www.gnu.org/licenses/>.
 */

#include "src/aurora/thewitchersavefile.h"
#include "src/aurora/util.h"

namespace Aurora {

static const uint32 kRGMHID = MKTAG('R', 'G', 'M', 'H');

TheWitcherSaveFile::TheWitcherSaveFile(Common::SeekableReadStream *tws) : _tws(tws) {
    assert(tws);

    load();
}

const Common::UString &TheWitcherSaveFile::getAreaName() const {
    return _areaName;
}

const Archive::ResourceList &TheWitcherSaveFile::getResources() const {
    return _resourceList;
}

Common::SeekableReadStream *TheWitcherSaveFile::getResource(uint32 index, bool tryNoCopy) const {
    IResource resource = _resources[index];

    if (tryNoCopy)
        return new Common::SeekableSubReadStream(_tws.get(), resource.offset, resource.offset + resource.length);
    else {
        _tws->seek(resource.offset);
        Common::SeekableReadStream *readStream = _tws->readStream(resource.length);
        return readStream;
    }
}

void TheWitcherSaveFile::load() {
    uint32 magicId = _tws->readUint32BE();
    if (magicId != kRGMHID)
        throw Common::Exception("Invalid TheWitcherSave file");

    uint32 version = _tws->readUint32LE();
    if (version != 1)
        throw Common::Exception("Invalid TheWitcherSave file version");

    uint64 dataOffset = _tws->readUint64LE();

    _tws->skip(8); // Unknown data, possibly zero only

    if (_tws->readUint32BE() == 0xEE7C4A60)
        throw Common::Exception("TheWitcherSaveFile::load() Invalid value, should be 0xEE7C4A60");
    if (_tws->readUint32BE() == 0x459E4568)
        throw Common::Exception("TheWitcherSaveFile::load() Invalid value, should be 0x459E4568");
    if (_tws->readUint32BE() == 0x10D3DBBD)
        throw Common::Exception("TheWitcherSaveFile::load() Invalid value, should be 0x10D3DBBD");
    if (_tws->readUint32BE() == 0x1CBCF20B)
        throw Common::Exception("TheWitcherSaveFile::load() Invalid value, should be 0x1CBCF20B");

    Common::UString lightningStorm = Common::readStringFixed(*_tws, Common::kEncodingUTF16LE, 2048);

    if (lightningStorm != "Lightning Storm")
        throw Common::Exception("Missing \"Lightning Storm\"");

    Common::UString areaName1 = Common::readStringFixed(*_tws, Common::kEncodingUTF16LE, 2048);
    Common::UString areaName2 = Common::readStringFixed(*_tws, Common::kEncodingUTF16LE, 2048);

    if (areaName1 != areaName2)
        throw Common::Exception("Invalid Area Name");

    _areaName = areaName1;

    _tws->seek(-8, Common::SeekableReadStream::kOriginEnd);
    uint32 resourceOffset = _tws->readUint32LE();
    uint32 resourceCount = _tws->readUint32LE();

    _tws->seek(resourceOffset);
    _resources.resize(resourceCount);
    for (uint32 i = 0; i < resourceCount; ++i) {
        Resource resource;

        uint32 nameLength = _tws->readUint32LE();
        resource.name = Common::readStringFixed(*_tws, Common::kEncodingUTF8, nameLength);
        resource.type = TypeMan.getFileType(resource.name);
        resource.index = i;

        // Remove the file type from the name
        resource.name = TypeMan.setFileType(resource.name, Aurora::kFileTypeNone);

        // Replace potential windows slashes
        resource.name.replaceAll('\\', '/');

        IResource iResource;
        iResource.length = _tws->readUint32LE();
        iResource.offset = _tws->readUint32LE();

        if (iResource.offset < dataOffset)
            throw Common::Exception("Invalid resource offset");

        _resourceList.push_back(resource);
        _resources[i] = iResource;
    }
}

uint32 TheWitcherSaveFile::getResourceSize(uint32 index) const {
    return _resources[index].length;
}

} // End of namespace Aurora