public Stream Open(Stream sourceStream)
{
if (Stream != null)
{
return(Stream);
}
Stream stream = sourceStream.CreateSubView(Position, Length);
if (Length == 0)
{
return(stream);
}
if (IsEncrypted)
{
AesManaged aesManaged;
if (IsFutureTone)
{
// The IV for the entry is right
// before the data.
byte[] iv = new byte[16];
stream.Read(iv, 0, 16);
aesManaged = FarcArchive.CreateAesManagedForFT(iv);
}
else
{
aesManaged = FarcArchive.CreateAesManaged();
}
var decryptor = aesManaged.CreateDecryptor();
stream = new CryptoStream(stream, decryptor, CryptoStreamMode.Read);
}
if (IsCompressed)
{
stream = new GZipStream(stream, CompressionMode.Decompress);
}
return(stream);
}
internal CryptoStream GetDecryptingStream(Stream stream, bool leaveOpen = false)
{
AesManaged aesManaged;
if (IsFutureTone)
{
byte[] iv = new byte[16];
stream.Read(iv, 0, 16);
aesManaged = FarcArchive.CreateAesManagedForFT(iv);
}
else
{
aesManaged = FarcArchive.CreateAesManaged();
}
var decryptor = aesManaged.CreateDecryptor();
return(new NonClosingCryptoStream(stream, decryptor, CryptoStreamMode.Read, leaveOpen));
}
