public void Validate(EncodeRequest request)
{
ValidateNotNull(request, "Request must not be null");
ValidateCoverImage(request.CoverPath);
ValidateMessage(request.MessagePath);
ValidateMessageSize(request);
ValidateResultPath(request.ResultPath);
}
private void ValidateMessageSize(EncodeRequest request)
{
FileInfo messageInfo = new FileInfo(request.MessagePath);
Bitmap image = (Bitmap)Image.FromFile(request.CoverPath);
int pixelCount = image.Width * image.Height;
int freeBits = pixelCount * 3;
int headerBits = new BitArray(BitConverter.GetBytes(freeBits)).Count;
if (freeBits - headerBits < messageInfo.Length)
{
throw new ValidationException("Message size is greater the the free bytes in cover image");
}
}
public void EncodeMessageSeq(EncodeRequest request)
{
encodeValidator.Validate(request);
Bitmap coverImage = new Bitmap(request.CoverPath);
Rectangle rect = new Rectangle(0, 0, coverImage.Width, coverImage.Height);
BitmapData coverData = coverImage.LockBits(rect, ImageLockMode.ReadWrite, coverImage.PixelFormat);
IntPtr ptr = coverData.Scan0;
int bytes = Math.Abs(coverData.Stride) * coverImage.Height;
BitArray messageWithHeader = CreateMessageWithHeader(bytes, request.MessagePath);
EncodeMessageIntoCoverSeq(messageWithHeader, bytes, ptr);
coverImage.UnlockBits(coverData);
coverImage.Save(request.ResultPath);
}