public int CalculateCrc()
{
if (!IsValid)
{
return(0);
}
using (MemoryStream stream = new MemoryStream())
{
// serialise tags to a buffer, without any padding
FrameManager.Serialize(this, stream);
// obtain whole buffer as byte array
byte[] buffer = stream.ToArray();
// calculate the size of the tag without the padding
int tagsize = (int)buffer.Length - (int)Header.PaddingSize;
// create and calculate crc-32 for the tag
ICSharpCode.SharpZipLib.Checksums.Crc32 crc = new ICSharpCode.SharpZipLib.Checksums.Crc32();
crc.Update(buffer, 0, tagsize);
return((int)crc.Value);
}
}