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/* cummVM - 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 3 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "common/endian.h"
#include "common/debug.h"
#include "common/str.h"
#include "common/file.h"
#include "common/util.h"
#include "common/memstream.h"
#include "common/compression/dcl.h"
#include "mads/mps_installer.h"
namespace MADS {
MpsInstaller* MpsInstaller::open(const Common::Path& baseName) {
Common::File indexFile;
FileMap _files;
if (!indexFile.open(baseName.append(".IDX")))
return nullptr;
uint32 filecnt = indexFile.readUint16LE();
indexFile.skip(10);
uint32 indexSize = indexFile.size();
static const int kNameFieldLength = 0x52;
static const int kEntryLength = kNameFieldLength + 0x10;
if (filecnt > (indexSize - 12) / kEntryLength)
filecnt = (indexSize - 12) / kEntryLength;
for (uint i = 0; i < filecnt; i++) {
Common::Path name(indexFile.readString('\0', kNameFieldLength));
uint16 compression = indexFile.readUint16LE();
uint16 volumeNumber = indexFile.readUint16LE();
uint32 offsetInVolume = indexFile.readUint32LE();
uint32 compressedSize = indexFile.readUint32LE();
uint32 uncompressedSize = indexFile.readUint32LE();
FileDescriptor desc(name, compression, volumeNumber, offsetInVolume, compressedSize, uncompressedSize);
_files[desc._fileName] = desc;
}
return new MpsInstaller(_files, baseName);
}
bool MpsInstaller::hasFile(const Common::Path &path) const {
return _files.contains(translatePath(path));
}
int MpsInstaller::listMembers(Common::ArchiveMemberList &list) const {
for (FileMap::const_iterator i = _files.begin(), end = _files.end(); i != end; ++i) {
list.push_back(Common::ArchiveMemberList::value_type(new Common::GenericArchiveMember(i->_key, *this)));
}
return _files.size();
}
const Common::ArchiveMemberPtr MpsInstaller::getMember(const Common::Path &path) const {
Common::Path translated = translatePath(path);
if (!_files.contains(translated))
return nullptr;
return Common::ArchiveMemberPtr(new Common::GenericArchiveMember(_files.getVal(translated)._fileName, *this));
}
Common::SharedArchiveContents MpsInstaller::readContentsForPath(const Common::Path &translated) const {
if (!_files.contains(translated))
return Common::SharedArchiveContents();
FileDescriptor desc = _files.getVal(translated);
if (desc._compressionAlgo != 0 && desc._compressionAlgo != 1) {
debug ("Unsupported compression algorithm %d for %s", desc._compressionAlgo, desc._fileName.toString().c_str());
return Common::SharedArchiveContents();
}
uint32 off = desc._offsetInVolume;
uint vol = desc._volumeNumber;
uint32 rem = desc._compressedSize;
byte *compressedBuf = new byte[rem];
byte *outptr = compressedBuf;
while (rem > 0) {
Common::File fvol;
Common::Path volumePath = _baseName.append(Common::String::format(".%03d", vol));
if (!fvol.open(volumePath)) {
error("Failed to open volume %s.%03d", volumePath.toString(Common::Path::kNativeSeparator).c_str(), vol);
delete[] compressedBuf;
return Common::SharedArchiveContents();
}
fvol.seek(off);
int32 actual = fvol.read(outptr, rem);
if (actual <= 0) {
warning("Read failure in volume %s.%03d", volumePath.toString(Common::Path::kNativeSeparator).c_str(), vol);
delete[] compressedBuf;
return Common::SharedArchiveContents();
}
rem -= actual;
outptr += actual;
if (actual == 0)
break;
vol++;
off = 0;
}
byte *uncompressedBuf;
uint32 uncompressedSize = desc._uncompressedSize;
switch (desc._compressionAlgo) {
case 0:
uncompressedBuf = compressedBuf;
uncompressedSize = desc._compressedSize;
compressedBuf = nullptr;
break;
case 1: {
Common::MemoryReadStream compressedReadStream(compressedBuf, desc._compressedSize);
uncompressedBuf = new byte[uncompressedSize];
if (!Common::decompressDCL(&compressedReadStream, uncompressedBuf, desc._compressedSize, uncompressedSize)) {
delete[] compressedBuf;
delete[] uncompressedBuf;
error("Unable to decompress %s", desc._fileName.toString().c_str());
return Common::SharedArchiveContents();
}
delete[] compressedBuf;
compressedBuf = nullptr;
} break;
default:
error("Unsupported compression algorithm");
uncompressedBuf = nullptr;
break;
}
// TODO: Make it configurable to read directly from disk, at least in the uncompressed case
return Common::SharedArchiveContents(uncompressedBuf, desc._uncompressedSize);
}
}
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