// Compressed files start with an array of offsets to make seeking possible
private void LoadBlockPositions()
{
int blockposcount = (int)((_entry.FileSize + _blockSize - 1) / _blockSize) + 1;
// Files with metadata have an extra block containing block checksums
if ((_entry.Flags & MpqFileFlags.FileHasMetadata) != 0)
{
blockposcount++;
}
_blockPositions = new uint[blockposcount];
lock (_stream)
{
_stream.Seek(_entry.FilePos, SeekOrigin.Begin);
BinaryReader br = new BinaryReader(_stream);
for (int i = 0; i < blockposcount; i++)
{
_blockPositions[i] = br.ReadUInt32();
}
}
uint blockpossize = (uint)blockposcount * 4;
/*
* if(_blockPositions[0] != blockpossize)
* _entry.Flags |= MpqFileFlags.Encrypted;
*/
if (_entry.IsEncrypted)
{
if (_entry.EncryptionSeed == 0) // This should only happen when the file name is not known
{
_entry.EncryptionSeed = MpqArchive.DetectFileSeed(_blockPositions[0], _blockPositions[1], blockpossize) + 1;
if (_entry.EncryptionSeed == 1)
{
throw new MpqParserException("Unable to determine encyption seed");
}
}
MpqArchive.DecryptBlock(_blockPositions, _entry.EncryptionSeed - 1);
if (_blockPositions[0] != blockpossize)
{
throw new MpqParserException("Decryption failed");
}
if (_blockPositions[1] > _blockSize + blockpossize)
{
throw new MpqParserException("Decryption failed");
}
}
}
private void LoadBlockPositions()
{
int num = ((int)(((this._entry.FileSize + this._blockSize) - 1) / ((long)this._blockSize))) + 1;
if ((this._entry.Flags & MpqFileFlags.FileHasMetadata) != ((MpqFileFlags)0))
{
num++;
}
this._blockPositions = new uint[num];
lock (this._stream)
{
this._stream.Seek((long)this._entry.FilePos, SeekOrigin.Begin);
BinaryReader reader = new BinaryReader(this._stream);
for (int i = 0; i < num; i++)
{
this._blockPositions[i] = reader.ReadUInt32();
}
}
uint decrypted = (uint)(num * 4);
if (this._entry.IsEncrypted)
{
if (this._entry.EncryptionSeed == 0)
{
this._entry.EncryptionSeed = MpqArchive.DetectFileSeed(this._blockPositions[0], this._blockPositions[1], decrypted) + 1;
if (this._entry.EncryptionSeed == 1)
{
throw new MpqParserException("Unable to determine encyption seed");
}
}
MpqArchive.DecryptBlock(this._blockPositions, this._entry.EncryptionSeed - 1);
if (this._blockPositions[0] != decrypted)
{
throw new MpqParserException("Decryption failed");
}
if (this._blockPositions[1] > (this._blockSize + decrypted))
{
throw new MpqParserException("Decryption failed");
}
}
}