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102 lines
2.7 KiB
C++
Executable File
102 lines
2.7 KiB
C++
Executable File
/* Residual - A 3D game interpreter
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*
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* Residual is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the AUTHORS
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* file distributed with this source distribution.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* $URL$
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* $Id$
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*
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*/
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#include "engines/myst3/archive.h"
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#include "common/debug.h"
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#include "common/memstream.h"
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namespace Myst3 {
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void Archive::_decryptHeader(Common::SeekableReadStream &inStream, Common::WriteStream &outStream) {
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static const uint32 addKey = 0x3C6EF35F;
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static const uint32 multKey = 0x0019660D;
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inStream.seek(0);
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uint32 encryptedSize = inStream.readUint32LE();
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uint32 decryptedSize = encryptedSize ^ addKey;
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inStream.seek(0);
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uint32 currentKey = 0;
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for (uint i = 0; i < decryptedSize; i++) {
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currentKey += addKey;
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outStream.writeUint32LE(inStream.readUint32LE() ^ currentKey);
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currentKey *= multKey;
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}
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}
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void Archive::_readDirectory() {
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Common::MemoryWriteStreamDynamic buf(DisposeAfterUse::YES);
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_decryptHeader(_file, buf);
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Common::MemoryReadStream directory(buf.getData(), buf.size());
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directory.skip(sizeof(uint32));
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while (directory.pos() < directory.size()) {
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DirectoryEntry entry;
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entry.readFromStream(directory);
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if (entry.hasSubEntries()) {
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_directory.push_back(entry);
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}
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}
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}
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void Archive::dumpDirectory() {
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for (uint i = 0; i < _directory.size(); i++) {
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_directory[i].dump();
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}
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}
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void Archive::dumpToFiles() {
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for (uint i = 0; i < _directory.size(); i++) {
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_directory[i].dumpToFiles(_file);
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}
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}
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Common::MemoryReadStream *Archive::dumpToMemory(uint16 index, uint16 face, DirectorySubEntry::ResourceType type) {
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for (uint i = 0; i < _directory.size(); i++) {
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if (_directory[i].getIndex() == index) {
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return _directory[i].dumpToMemory(_file, face, type);
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}
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}
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return 0;
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}
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bool Archive::open(const char *fileName) {
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if (_file.open(fileName)) {
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_readDirectory();
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return true;
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}
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return false;
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}
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void Archive::close() {
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_file.close();
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}
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} // end of namespace Myst3
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