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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.
*
*/
// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL
// HACK to allow building with the SDL backend on MinGW
// see bug #1800764 "TOOLS: MinGW tools building broken"
#ifdef main
#undef main
#endif // main
#include "cc.h"
#include "common/endian.h"
uint16 CCArchive::convertNameToId(const Common::String &resourceName) {
if (resourceName.empty())
return 0xffff;
Common::String name = resourceName;
name.toUppercase();
// Check if a resource number is being directly specified
if (name.size() == 4) {
char *endPtr;
uint16 num = (uint16)strtol(name.c_str(), &endPtr, 16);
if (!*endPtr)
return num;
}
const byte *msgP = (const byte *)name.c_str();
int total = *msgP++;
for (; *msgP; total += *msgP++) {
// Rotate the bits in 'total' right 7 places
total = (total & 0x007F) << 9 | (total & 0xFF80) >> 7;
}
return total;
}
void CCArchive::loadIndex() {
int count = _file.readUint16LE();
// Read in the data for the archive's index
byte *rawIndex = new byte[count * 8];
_file.read(rawIndex, count * 8);
// Decrypt the index
int seed = 0xac;
for (int i = 0; i < count * 8; ++i, seed += 0x67) {
rawIndex[i] = (byte)((((rawIndex[i] << 2) | (rawIndex[i] >> 6)) + seed) & 0xff);
}
// Extract the index data into entry structures
_index.resize(count);
const byte *entryP = &rawIndex[0];
for (int idx = 0; idx < count; ++idx, entryP += 8) {
CCEntry &entry = _index[idx];
entry._id = READ_LE_UINT16(entryP);
entry._offset = READ_LE_UINT32(entryP + 2) & 0xffffff;
entry._size = READ_LE_UINT16(entryP + 5);
assert(!entryP[7]);
}
delete[] rawIndex;
}
void CCArchive::saveIndex() {
// Fill up the data for the index entries into a raw data block
byte *rawIndex = new byte[_index.size() * 8];
byte b;
byte *entryP = rawIndex;
uint entryOffset = 8 * _index.size() + 2;
for (uint i = 0; i < _index.size(); ++i, entryP += 8) {
CCEntry &entry = _index[i];
entry._offset = entryOffset;
entryOffset += entry._size;
WRITE_LE_UINT16(&entryP[0], entry._id);
WRITE_LE_UINT32(&entryP[2], entry._offset);
WRITE_LE_UINT16(&entryP[5], entry._size);
entryP[7] = 0;
}
// Encrypt the index
int seed = 0xac;
for (uint i = 0; i < _index.size() * 8; ++i, seed += 0x67) {
b = (rawIndex[i] - seed) & 0xff;
b = (byte)((b >> 2) | (b << 6));
assert(rawIndex[i] == (byte)((((b << 2) | (b >> 6)) + seed) & 0xff));
rawIndex[i] = b;
}
// Write out the number of entries and the encrypted index data
_file.writeWord(_index.size());
_file.write(rawIndex, _index.size() * 8);
delete[] rawIndex;
}
void CCArchive::saveEntries() {
for (uint idx = 0; idx < _index.size(); ++idx) {
CCEntry &ccEntry = _index[idx];
// Encrypt the entry
for (int i = 0; i < ccEntry._size; ++i)
ccEntry._data[i] ^= 0x35;
// Write out the entry
_file.seek(ccEntry._offset);
_file.write(ccEntry._data, ccEntry._size);
}
}
void CCArchive::close() {
if (_mode == kWrite) {
saveIndex();
saveEntries();
}
}
void CCArchive::add(const Common::String &name, Common::MemFile &f) {
assert(_mode == kWrite);
_index.push_back(CCEntry(convertNameToId(name), f.getData(), f.size()));
}
Common::MemFile CCArchive::getMember(const Common::String &name) {
uint16 id = convertNameToId(name);
for (uint idx = 0; idx < _index.size(); ++idx) {
CCEntry &entry = _index[idx];
if (entry._id == id) {
_file.seek(entry._offset);
_file.read(entry._data, entry._size);
// Decrypt the entry
for (int i = 0; i < entry._size; ++i)
entry._data[i] ^= 0x35;
return Common::MemFile(entry._data, entry._size);
}
}
error("Failed to find %s", name.c_str());
}
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