//Contructor carrying out the main actions for this class
public Encrypting(Color startColor, string temp_origText, IO curIO, int temp_encryptingNumber)
{
if (temp_origText == null || temp_origText.Trim().Length < 1)
{
errorMessage = "Please, introduce the string to be encrypted.";
errors = true;
return;
}
ignoredChars = new List<char>();
origText = temp_origText;
modifiedText = origText;
encryptingNumber = temp_encryptingNumber;
//Creating the "hash table" (list of colors associated to the characters) has, logically, to be done before starting the encryption.
//Note that the input string (its length) is also brought into picture while hashing
curHashing = new Hashing(startColor, this, null, curIO);
//Performing the actual encryption
if (!curHashing.errors)
{
encryptText(startColor, origText);
}
else
{
this.errorMessage = curHashing.errorMessage;
this.errors = true;
}
}
//Constructor with the required "pre-actions" (e.g., hashing) before starting the process
public Decrypting(Color startColor, Bitmap curBitMap, IO curIO, int temp_encryptingNumber)
{
origBitmap = curBitMap;
encryptingNumber = temp_encryptingNumber;
curHashing = new Hashing(startColor, null, this, curIO);
if (!curHashing.errors)
{
startDecrypting(curIO);
}
else
{
errorMessage = curHashing.errorMessage;
errors = true;
}
}
//Decrypting process which, as far as it involves image management, is located in the IO class
public void startDecrypting(IO curIO)
{
curIO.decryptImage(this);
}
public Point startPixelOrig; //Stores the "fake start point", relevant while analysing the next pixels storing length information
#endregion Fields
#region Constructors
//---
//Starting actions on account of the given process (encryption/decription)
public Hashing(Color temp_startColor, Encrypting curEncrypting, Decrypting curDecrypting, IO temp_curIO)
{
startColor = temp_startColor;
curIO = temp_curIO;
curColors = new List<Color>(curIO.allKnownColors);
startOffset = new startOffsetInfo();
if (curEncrypting != null)
{
if (curEncrypting.origText == null || curEncrypting.origText.Length < 1)
{
errors = true;
return;
}
curLength = curEncrypting.origText.Length + 2 + (curEncrypting.origText.Length + 2).ToString().Length; //Length considered while decrypting
encryptingNumber = curEncrypting.encryptingNumber;
}
else
{
if (curDecrypting.origBitmap == null)
{
errorMessage = "There was a problem while accessing the image file.";
errors = true;
return;
}
encryptingNumber = curDecrypting.encryptingNumber;
pixelsToIgnore = new List<Point>();
//Preliminary validity check by looking for the startColor (in the right position) and determining the length (and the offset, if applicable)
curIO.getBoundaryPixels(curDecrypting, this);
if (curLength <= 0)
{
errors = true;
return;
}
}
calculateStartStep(); //Calculating curStep
buildCharsVsColors(); //Building the hash table (dictionary with all the accounted characters and their equivalent color) which will be used in the current encryption/decryption process
if (curDecrypting != null)
{
//For decryption. Confirming that the length value, calculated above, matches the information in the pixels enconding the actual length.
//The reason for not having this analysis before is the fact that the charsVsColors is required
if (!curIO.lengthIsOK(curDecrypting, this)) this.errors = true;
}
}
//Form load event populating the comboboxes with all the colours being considered (i.e., list of knownColors by removing repeated ones)
private void Form1_Load(object sender, EventArgs e)
{
curIO = new IO();
cmbBxEncryptStart.DataSource = new List<Color>(curIO.allKnownColors);
cmbBxDecryptStart.DataSource = new List<Color>(curIO.allKnownColors);
}
