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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 "common/dcl.h"
#include "neverhood/blbarchive.h"
namespace Neverhood {
/**
* A special variant of SafeSeekableSubReadStream which locks a mutex during each read.
* This is neccessary because the music is streamed from disk and it could happen
* that a sound effect or another music track is played from the same read stream
* while the first music track is updated/read.
*/
class SafeMutexedSeekableSubReadStream : public Common::SafeSeekableSubReadStream {
public:
SafeMutexedSeekableSubReadStream(SeekableReadStream *parentStream, uint32 begin, uint32 end, DisposeAfterUse::Flag disposeParentStream,
Common::Mutex &mutex)
: SafeSeekableSubReadStream(parentStream, begin, end, disposeParentStream), _mutex(mutex) {
}
virtual uint32 read(void *dataPtr, uint32 dataSize);
protected:
Common::Mutex &_mutex;
};
uint32 SafeMutexedSeekableSubReadStream::read(void *dataPtr, uint32 dataSize) {
Common::StackLock lock(_mutex);
return Common::SafeSeekableSubReadStream::read(dataPtr, dataSize);
}
BlbArchive::BlbArchive() : _extData(NULL) {
}
BlbArchive::~BlbArchive() {
delete[] _extData;
}
void BlbArchive::open(const Common::String &filename) {
BlbHeader header;
uint16 *extDataOffsets;
_entries.clear();
if (!_fd.open(filename))
error("BlbArchive::open() Could not open %s", filename.c_str());
header.id1 = _fd.readUint32LE();
header.id2 = _fd.readUint16LE();
header.extDataSize = _fd.readUint16LE();
header.fileSize = _fd.readUint32LE();
header.fileCount = _fd.readUint32LE();
if (header.id1 != 0x2004940 || header.id2 != 7 || header.fileSize != _fd.size())
error("BlbArchive::open() %s seems to be corrupt", filename.c_str());
debug(4, "%s: fileCount = %d", filename.c_str(), header.fileCount);
_entries.reserve(header.fileCount);
// Load file hashes
for (uint i = 0; i < header.fileCount; i++) {
BlbArchiveEntry entry;
entry.fileHash = _fd.readUint32LE();
_entries.push_back(entry);
}
extDataOffsets = new uint16[header.fileCount];
// Load file records
for (uint i = 0; i < header.fileCount; i++) {
BlbArchiveEntry &entry = _entries[i];
entry.type = _fd.readByte();
entry.comprType = _fd.readByte();
entry.extData = NULL;
extDataOffsets[i] = _fd.readUint16LE();
entry.timeStamp = _fd.readUint32LE();
entry.offset = _fd.readUint32LE();
entry.diskSize = _fd.readUint32LE();
entry.size = _fd.readUint32LE();
debug(4, "%08X: %03d, %02X, %04X, %08X, %08X, %08X, %08X",
entry.fileHash, entry.type, entry.comprType, extDataOffsets[i], entry.timeStamp,
entry.offset, entry.diskSize, entry.size);
}
// Load ext data
if (header.extDataSize > 0) {
_extData = new byte[header.extDataSize];
_fd.read(_extData, header.extDataSize);
for (uint i = 0; i < header.fileCount; i++)
_entries[i].extData = extDataOffsets[i] > 0 ? _extData + extDataOffsets[i] - 1 : NULL;
}
delete[] extDataOffsets;
}
void BlbArchive::load(uint index, byte *buffer, uint32 size) {
load(&_entries[index], buffer, size);
}
void BlbArchive::load(BlbArchiveEntry *entry, byte *buffer, uint32 size) {
Common::StackLock lock(_mutex);
_fd.seek(entry->offset);
switch (entry->comprType) {
case 1: // Uncompressed
if (size == 0)
size = entry->diskSize;
_fd.read(buffer, size);
break;
case 3: // DCL-compressed
if (!Common::decompressDCL(&_fd, buffer, entry->diskSize, entry->size))
error("BlbArchive::load() Error during decompression of %08X", entry->fileHash);
break;
default:
error("BlbArchive::load() Unknown compression type %d", entry->comprType);
}
}
byte *BlbArchive::getEntryExtData(uint index) {
return getEntryExtData(&_entries[index]);
}
byte *BlbArchive::getEntryExtData(BlbArchiveEntry *entry) {
return entry->extData;
}
Common::SeekableReadStream *BlbArchive::createStream(uint index) {
return createStream(&_entries[index]);
}
Common::SeekableReadStream *BlbArchive::createStream(BlbArchiveEntry *entry) {
return new SafeMutexedSeekableSubReadStream(&_fd, entry->offset, entry->offset + entry->diskSize,
DisposeAfterUse::NO, _mutex);
}
} // End of namespace Neverhood
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