public void ReadDatabase(CArchiveDatabaseEx db, IPasswordProvider pass)
{
db.Clear();
db.MajorVersion = _header[6];
db.MinorVersion = _header[7];
if (db.MajorVersion != 0)
throw new InvalidDataException();
uint crcFromArchive = DataReader.Get32(_header, 8);
long nextHeaderOffset = (long)DataReader.Get64(_header, 0xC);
long nextHeaderSize = (long)DataReader.Get64(_header, 0x14);
uint nextHeaderCrc = DataReader.Get32(_header, 0x1C);
uint crc = CRC.kInitCRC;
crc = CRC.Update(crc, nextHeaderOffset);
crc = CRC.Update(crc, nextHeaderSize);
crc = CRC.Update(crc, nextHeaderCrc);
crc = CRC.Finish(crc);
if (crc != crcFromArchive)
throw new InvalidDataException();
db.StartPositionAfterHeader = _streamOrigin + 0x20;
// empty header is ok
if (nextHeaderSize == 0)
return;
if (nextHeaderOffset < 0 || nextHeaderSize < 0 || nextHeaderSize > Int32.MaxValue)
throw new InvalidDataException();
if (nextHeaderOffset > _streamEnding - db.StartPositionAfterHeader)
throw new InvalidDataException();
_stream.Seek(nextHeaderOffset, SeekOrigin.Current);
byte[] header = new byte[nextHeaderSize];
_stream.ReadExact(header, 0, header.Length);
if (CRC.Finish(CRC.Update(CRC.kInitCRC, header, 0, header.Length)) != nextHeaderCrc)
throw new InvalidDataException();
using (CStreamSwitch streamSwitch = new CStreamSwitch())
{
streamSwitch.Set(this, header);
BlockType? type = ReadId();
if (type != BlockType.Header)
{
if (type != BlockType.EncodedHeader)
throw new InvalidDataException();
var dataVector = ReadAndDecodePackedStreams(db.StartPositionAfterHeader, pass);
// compressed header without content is odd but ok
if (dataVector.Count == 0)
return;
if (dataVector.Count != 1)
throw new InvalidDataException();
streamSwitch.Set(this, dataVector[0]);
if (ReadId() != BlockType.Header)
throw new InvalidDataException();
}
ReadHeader(db, pass);
}
}
