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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 "prince/archive.h"
#include "prince/decompress.h"
#include "common/stream.h"
#include "common/debug.h"
#include "common/memstream.h"
namespace Prince {
PtcArchive::PtcArchive() : _stream(NULL) {
}
PtcArchive::~PtcArchive() {
close();
}
static void decrypt(byte *buffer, uint32 size) {
uint32 key = 0xDEADF00D;
while (size--) {
*buffer++ += key & 0xFF;
key ^= 0x2E84299A;
key += 0x424C4148;
key = ((key & 1) << 31) | (key >> 1);
}
}
bool PtcArchive::open(const Common::String &filename) {
_stream = SearchMan.createReadStreamForMember(filename);
if (!_stream)
return false;
_stream->readUint32LE(); // magic
uint32 fileTableOffset = _stream->readUint32LE() ^ 0x4D4F4B2D; // MOK-
uint32 fileTableSize = _stream->readUint32LE() ^ 0x534F4654; // SOFT
//debug("fileTableOffset : %08X", fileTableOffset);
//debug("fileTableSize: %08X", fileTableSize);
_stream->seek(fileTableOffset);
byte *fileTable = new byte[fileTableSize];
byte *fileTableEnd = fileTable + fileTableSize;
_stream->read(fileTable, fileTableSize);
decrypt(fileTable, fileTableSize);
for (byte *fileItem = fileTable; fileItem < fileTableEnd; fileItem += 32) {
FileEntry item;
Common::String name = (const char*)fileItem;
item._offset = READ_LE_UINT32(fileItem + 24);
item._size = READ_LE_UINT32(fileItem + 28);
//debug("%12s %8X %d", name.c_str(), item._offset, item._size);
_items[name] = item;
}
delete[] fileTable;
return true;
}
void PtcArchive::close() {
delete _stream;
_stream = NULL;
_items.clear();
}
bool PtcArchive::hasFile(const Common::String &name) const {
// TODO: check if path matching should be added
return _items.contains(name);
}
int PtcArchive::listMembers(Common::ArchiveMemberList &list) const {
int matches = 0;
for (FileMap::const_iterator it = _items.begin(); it != _items.end(); ++it) {
list.push_back(Common::ArchiveMemberList::value_type(new Common::GenericArchiveMember(it->_key, this)));
matches++;
}
return matches;
}
const Common::ArchiveMemberPtr PtcArchive::getMember(const Common::String &name) const {
if (!_items.contains(name)) {
Common::ArchiveMemberPtr();
}
return Common::ArchiveMemberList::value_type(new Common::GenericArchiveMember(name, this));
}
Common::SeekableReadStream *PtcArchive::createReadStreamForMember(const Common::String &name) const {
if (!_items.contains(name)) {
return 0;
}
const FileEntry &entryHeader = _items[name];
if (entryHeader._size < 4)
return 0;
uint32 size = entryHeader._size;
_stream->seek(entryHeader._offset);
// This *HAS* to be malloc (not new[]) because MemoryReadStream uses free() to free the memory
byte* buffer = (byte *)malloc(size);
_stream->read(buffer, size);
if (READ_BE_UINT32(buffer) == 0x4D41534D) {
Decompressor dec;
uint32 decompLen = READ_BE_UINT32(buffer + 14);
byte *decompData = (byte*)malloc(decompLen);
dec.decompress(buffer + 18, decompData, decompLen);
free(buffer);
size = decompLen;
buffer = decompData;
}
//debug("PtcArchive::createReadStreamForMember name %s", name.c_str());
return new Common::MemoryReadStream(buffer, size, DisposeAfterUse::YES);
}
}
/* vim: set tabstop=4 noexpandtab: */
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