private static async Task <MemoryStream> InternalGetDecryptionStreamAsync(Stream input, IMS2SizeHeader size, IBufferedCipher cipher, bool zlibCompressed)
{
using var cs = new CipherStream(input, cipher, null);
byte[] bytes = new byte[size.Size];
int readBytes;
if (zlibCompressed)
{
using var z = new ZlibStream(cs, CompressionMode.Decompress, true);
readBytes = await z.ReadAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
else
{
readBytes = await cs.ReadAsync(bytes, 0, bytes.Length).ConfigureAwait(false);
}
if (readBytes != size.Size)
{
throw new ArgumentException("Size bytes from input do not match with header size.", nameof(input));
}
return(new MemoryStream(bytes));
}