mirror of
https://github.com/libretro/scummvm.git
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119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
/* ResidualVM - A 3D game interpreter
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*
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* ResidualVM 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 program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program 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
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; 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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*/
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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 size = inStream.readUint32LE();
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bool encrypted = size > 1000000;
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inStream.seek(0);
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if (encrypted) {
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uint32 decryptedSize = size ^ addKey;
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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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} else {
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for (uint i = 0; i < size; i++) {
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outStream.writeUint32LE(inStream.readUint32LE());
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}
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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() + 4 < directory.size()) {
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DirectoryEntry entry(this);
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if (_multipleRoom)
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entry.readFromStream(directory, 0);
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else
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entry.readFromStream(directory, _roomName);
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_directory.push_back(entry);
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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(uint32 offset, uint32 size) {
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_file.seek(offset);
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return static_cast<Common::MemoryReadStream *>(_file.readStream(size));
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}
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const DirectorySubEntry *Archive::getDescription(const char *room, uint32 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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&& !strcmp(_directory[i].getRoom(), room)) {
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return _directory[i].getItemDescription(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, const char *room) {
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// Copy the room name if provided
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// If the room name is not provided, it is assumed that
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// we are opening a multi-room archive
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_multipleRoom = room == 0;
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if (!_multipleRoom)
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Common::strlcpy(_roomName, room, sizeof(_roomName));
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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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_directory.clear();
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_file.close();
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}
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} // end of namespace Myst3
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