public static Stream CreateBlock(this Stream baseStream, BlockOptions options, byte[] key, byte[] iv)
{
var compression = options.HasFlag(BlockOptions.Compression);
var encryption = options.HasFlag(BlockOptions.Encryption);
if (compression)
{
if (encryption) //compression & encryption
{
var gzipStream = new GZipStream(baseStream, CompressionLevel.Optimal, true);
var rijAlg = Rijndael.Create();
rijAlg.Key = key;
rijAlg.IV = iv;
var encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
var encryptionStream = new CryptoStream(gzipStream, encryptor, CryptoStreamMode.Write);
return(BlockStream.Create(baseStream, encryptionStream, () =>
{
encryptionStream.FlushFinalBlock();
gzipStream.Close();
}, CloseOptions.Flush));
}
else //compression
{
var gzipStream = new GZipStream(baseStream, CompressionLevel.Optimal, true);
return(BlockStream.Create(baseStream, gzipStream, null, CloseOptions.Flush | CloseOptions.CloseWrapper));
}
}
else
{
if (encryption) //encryption
{
var rijAlg = Rijndael.Create();
rijAlg.Key = key;
rijAlg.IV = iv;
var encryptor = rijAlg.CreateEncryptor(rijAlg.Key, rijAlg.IV);
var encryptionStream = new CryptoStream(baseStream, encryptor, CryptoStreamMode.Write);
return(BlockStream.Create(baseStream, encryptionStream, () =>
{
encryptionStream.FlushFinalBlock();
}, CloseOptions.Flush));
}
else
{
throw new ArgumentOutOfRangeException();
}
}
}
private bool MatchesBlockOptionsFilter(string name, BlockOptions options)
{
var m = _blocksfilter.Match(name);
if (m.Success)
{
switch (int.Parse(m.Groups[1].Value))
{
case 4:
return(options.HasFlag(BlockOptions.IPv4));
case 6:
return(options.HasFlag(BlockOptions.IPv6));
}
}
return(false);
}
