mirror of
https://github.com/scummvm/scummvm.git
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109 lines
3.1 KiB
C++
109 lines
3.1 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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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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*
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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, see <http://www.gnu.org/licenses/>.
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*
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*/
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// Disable symbol overrides so that we can use system headers.
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#define FORBIDDEN_SYMBOL_ALLOW_ALL
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#include "cc.h"
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#include "common/endian.h"
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uint16 CCArchive::convertNameToId(const Common::String &resourceName) {
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if (resourceName.empty())
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return 0xffff;
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Common::String name = resourceName;
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name.toUppercase();
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// Check if a resource number is being directly specified
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if (name.size() == 4) {
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char *endPtr;
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uint16 num = (uint16)strtol(name.c_str(), &endPtr, 16);
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if (!*endPtr)
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return num;
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}
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const byte *msgP = (const byte *)name.c_str();
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int total = *msgP++;
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for (; *msgP; total += *msgP++) {
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// Rotate the bits in 'total' right 7 places
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total = (total & 0x007F) << 9 | (total & 0xFF80) >> 7;
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}
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return total;
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}
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void CCArchive::loadIndex() {
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int count = _file.readUint16LE();
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long size = count * 8;
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// Read in the data for the archive's index
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byte *rawIndex = new byte[size];
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if (_file.read(rawIndex, size) != size) {
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delete[] rawIndex;
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error("Failed to read %ld bytes from CC archive", size);
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}
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// Decrypt the index
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int seed = 0xac;
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for (int i = 0; i < count * 8; ++i, seed += 0x67) {
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rawIndex[i] = (byte)((((rawIndex[i] << 2) | (rawIndex[i] >> 6)) + seed) & 0xff);
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}
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// Extract the index data into entry structures
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_index.resize(count);
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const byte *entryP = &rawIndex[0];
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for (int idx = 0; idx < count; ++idx, entryP += 8) {
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CCEntry &entry = _index[idx];
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entry._id = READ_LE_UINT16(entryP);
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entry._offset = READ_LE_UINT32(entryP + 2) & 0xffffff;
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entry._size = READ_LE_UINT16(entryP + 5);
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assert(!entryP[7]);
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}
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delete[] rawIndex;
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}
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void CCArchive::close() {
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}
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Common::MemFile CCArchive::getMember(const Common::String &name) {
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uint16 id = convertNameToId(name);
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for (uint idx = 0; idx < _index.size(); ++idx) {
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CCEntry &entry = _index[idx];
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if (entry._id == id) {
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if (_file.seek(entry._offset) != 0)
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error("Failed to seek to %d for CC archive", entry._offset);
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if (_file.read(entry._data, entry._size) != entry._size)
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error("Failed to read %hu bytes from CC archive", entry._size);
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// Decrypt the entry
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for (int i = 0; i < entry._size; ++i)
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entry._data[i] ^= 0x35;
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return Common::MemFile(entry._data, entry._size);
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}
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}
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error("Failed to find %s", name.c_str());
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}
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