public static byte[] Inject(byte[] png, byte[] data)
{
VerifyPng(png);
var size = new byte[] { (byte)((data.Length >> 24) & 0xff), (byte)((data.Length >> 16) & 0xff),
(byte)((data.Length >> 8) & 0xff), (byte)(data.Length & 0xff) };
var crc = new Crc32().ComputeHash(data);
var result = new byte[png.Length + size.Length + tag.Length + data.Length + crc.Length];
var index = 0;
png.CopyTo(result, index); index += png.Length - iend.Length;
size.CopyTo(result, index); index += size.Length;
tag.CopyTo(result, index); index += tag.Length;
data.CopyTo(result, index); index += data.Length;
crc.CopyTo(result, index); index += crc.Length;
iend.CopyTo(result, index);
return result;
}