mirror of
https://github.com/libretro/scummvm.git
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165 lines
3.9 KiB
C++
165 lines
3.9 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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#include "bladerunner/archive.h"
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#include "common/debug.h"
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namespace BladeRunner {
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MIXArchive::MIXArchive() {
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_isTLK = false;
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_entryCount = 0;
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_size = 0;
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}
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MIXArchive::~MIXArchive() {
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if (_fd.isOpen()) {
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warning("~MIXArchive: File not closed: %s", _fd.getName());
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}
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}
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bool MIXArchive::exists(const Common::String &filename) {
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return Common::File::exists(filename);
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}
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bool MIXArchive::open(const Common::String &filename) {
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if (!_fd.open(filename)) {
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error("MIXArchive::open(): Can not open %s", filename.c_str());
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return false;
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}
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_isTLK = filename.hasSuffix(".TLK");
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_entryCount = _fd.readUint16LE();
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_size = _fd.readUint32LE();
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_entries.resize(_entryCount);
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for (uint16 i = 0; i != _entryCount; ++i) {
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_entries[i].hash = _fd.readUint32LE();
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_entries[i].offset = _fd.readUint32LE();
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_entries[i].length = _fd.readUint32LE();
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// Verify that the entries are sorted by id. Note that id is signed.
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if (i > 0) {
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assert(_entries[i].hash > _entries[i - 1].hash);
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}
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}
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if (_fd.err()) {
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error("MIXArchive::open(): Error reading entries in %s", filename.c_str());
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_fd.close();
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return false;
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}
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// debug("MIXArchive::open: Opened archive %s", filename.c_str());
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return true;
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}
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void MIXArchive::close() {
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return _fd.close();
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}
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bool MIXArchive::isOpen() const {
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return _fd.isOpen();
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}
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#define ROL(n) ((n << 1) | ((n >> 31) & 1))
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int32 MIXArchive::getHash(const Common::String &name) {
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char buffer[12] = { 0 };
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for (uint i = 0; i != name.size() && i < 12u; ++i) {
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buffer[i] = (char)toupper(name[i]);
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}
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uint32 id = 0;
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for (int i = 0; i < 12 && buffer[i]; i += 4) {
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uint32 t = (uint32)buffer[i + 3] << 24
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| (uint32)buffer[i + 2] << 16
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| (uint32)buffer[i + 1] << 8
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| (uint32)buffer[i + 0];
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id = ROL(id) + t;
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}
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return id;
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}
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static uint32 tlk_id(const Common::String &name) {
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char buffer[12] = { 0 };
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for (uint i = 0; i != name.size() && i < 12u; ++i)
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buffer[i] = (char)toupper(name[i]);
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int actor_id = 10 * (buffer[0] - '0') +
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(buffer[1] - '0');
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int speech_id = 1000 * (buffer[3] - '0') +
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100 * (buffer[4] - '0') +
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10 * (buffer[5] - '0') +
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(buffer[6] - '0');
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return 10000 * actor_id + speech_id;
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}
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uint32 MIXArchive::indexForHash(int32 hash) const {
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uint32 lo = 0, hi = _entryCount;
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while (lo < hi) {
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uint32 mid = lo + (hi - lo) / 2;
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if (hash > _entries[mid].hash) {
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lo = mid + 1;
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} else if (hash < _entries[mid].hash) {
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hi = mid;
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} else {
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return mid;
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}
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}
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return _entryCount;
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}
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Common::SeekableReadStream *MIXArchive::createReadStreamForMember(const Common::String &name) {
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int32 hash;
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if (_isTLK) {
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hash = tlk_id(name);
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} else {
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hash = MIXArchive::getHash(name);
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}
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uint32 i = indexForHash(hash);
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if (i == _entryCount) {
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return nullptr;
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}
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uint32 start = _entries[i].offset + 6 + 12 * _entryCount;
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uint32 end = _entries[i].length + start;
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return new Common::SafeSeekableSubReadStream(&_fd, start, end, DisposeAfterUse::NO);
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}
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} // End of namespace BladeRunner
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