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