/// <summary>
/// Decodes the text message from the bitmap.
/// Precondition: none
/// Post-condition: none
/// </summary>
/// <returns>The embedded text message from the color channel bytes.</returns>
public string DecodeTextMessage()
{
var binaryMessage = string.Empty;
for (var y = 0; y < this.Height; y++)
{
for (var x = 0; x < this.Width; x++)
{
if (TextDecoder.EndsWithStopIndicator(binaryMessage))
{
break;
}
binaryMessage = this.extractMessageBitsFromPixel(x, y, binaryMessage);
}
}
return(this.headerPixels.HasEncryption ? TextCipher.DecryptText(binaryMessage.ConvertBinaryToString()) :
TextDecoder.RemoveDecodeIndicator(binaryMessage.ConvertBinaryToString()));
}
private static string setupTextMessage(string message, string encryptionKey)
{
message = TextCipher.EncryptTextWithKey(message, encryptionKey);
message += TextDecoder.DecodingStopIndicator + " ";
return(message.ConvertToBinary());
}
