private void LoadBlockOffsets()
{
int blockposcount = (int)((blockRecord.FileSize + blockSize - 1) / blockSize) + 1;
blockPositions = new uint[blockposcount];
lock (mpq.fileStream)
{
mpq.fileStream.Seek(blockRecord.BlockOffset, SeekOrigin.Begin);
var br = new BinaryReader(mpq.fileStream);
for (int i = 0; i < blockposcount; i++)
{
blockPositions[i] = br.ReadUInt32();
}
}
uint blockpossize = (uint)blockposcount * 4;
if (blockRecord.IsEncrypted)
{
MPQ.DecryptBlock(blockPositions, blockRecord.EncryptionSeed - 1);
if (blockPositions[0] != blockpossize)
{
throw new OpenDiablo2Exception("Decryption failed");
}
if (blockPositions[1] > blockSize + blockpossize)
{
throw new OpenDiablo2Exception("Decryption failed");
}
}
}
internal MPQStream(MPQ mpq, BlockRecord blockRecord)
{
this.mpq = mpq;
this.blockRecord = blockRecord;
this.blockSize = 0x200 << mpq.Header.BlockSize;
if (blockRecord.IsCompressed && !blockRecord.SingleUnit)
{
LoadBlockOffsets();
}
}