SteganographyHelper.cs

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using System;
using System.Drawing;
//51aspx
namespace Steganography
{
    class SteganographyHelper
    {
        public enum State
        {
            Hiding,
            Filling_With_Zeros
        };

        public static Bitmap embedText(string text, Bitmap bmp)
        {
            // initially, we'll be hiding characters in the image
            State state = State.Hiding;

            // holds the index of the character that is being hidden
            int charIndex = 0;

            // holds the value of the character converted to integer
            int charValue = 0;

            // holds the index of the color element (R or G or B) that is currently being processed
            long pixelElementIndex = 0;

            // holds the number of trailing zeros that have been added when finishing the process
            int zeros = 0;

            // hold pixel elements
            int R = 0, G = 0, B = 0;

            // pass through the rows
            for (int i = 0; i < bmp.Height; i++)
            {
                // pass through each row
                for (int j = 0; j < bmp.Width; j++)
                {
                    // holds the pixel that is currently being processed
                    Color pixel = bmp.GetPixel(j, i);

                    // now, clear the least significant bit (LSB) from each pixel element
                    R = pixel.R - pixel.R % 2;
                    G = pixel.G - pixel.G % 2;
                    B = pixel.B - pixel.B % 2;

                    // for each pixel, pass through its elements (RGB)
                    for (int n = 0; n < 3; n++)
                    {
                        // check if new 8 bits has been processed
                        if (pixelElementIndex % 8 == 0)
                        {
                            // check if the whole process has finished
                            // we can say that it's finished when 8 zeros are added
                            if (state == State.Filling_With_Zeros && zeros == 8)
                            {
                                // apply the last pixel on the image
                                // even if only a part of its elements have been affected
                                if ((pixelElementIndex - 1) % 3 < 2)
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