/**
* Combines two directories into an output directory.
* <P>
* The output directory (tempdir) will have all the original
* images plus all the stegoimages copied into it.
*
* @param messagedir The directory full of messages in (txt files).
* @param imagedir The directory full of images (png, jpg, bmp).
* @param tempdir The directory to write the results to.
* @param algorithm The algorithm to use to combine the messages and
* images with.
* @throws IllegalArgumentException If any directories are null.
* @return A string full of skipped files.
*/
public string CreateCombineDirectories(string messagedir, string imagedir, string tempdir,
SteganographicAlgorithmImpl algorithm)
{
if (!Directory.Exists(messagedir) || !Directory.Exists(imagedir) || !Directory.Exists(tempdir))
{
throw new ArgumentException("Must be directories!");
}
var errors = new StringBuilder("Errors: \n========\n\n");
var messageList = Directory.GetFiles(messagedir);
var imagelist = Directory.GetFiles(imagedir);
string coverfilepath, messagefilepath, outputpath, originalname;
var fileseperator = Path.DirectorySeparatorChar;
// //for each file in the image folder...
foreach (var imagefile in imagelist)
{
if (imagefile.EndsWith(".bmp") || imagefile.EndsWith(".jpg") || imagefile.EndsWith(".png"))
{
//ok to combine it...
coverfilepath = imagedir;
originalname = imagefile.Substring(0, imagefile.IndexOf("."));
//for each message in the message folder...
foreach (var messagefile in messageList)
{
try
{
if (messagefile.EndsWith(".txt"))
{
//ok to combine...
messagefilepath = messagefile;
//setup the two files...
//setup the filename...
outputpath = originalname + "~" + messagefile.Substring(0, messagefile.LastIndexOf(".")) +
"-"
+
algorithm.GetType()
.Name.ToLower()
.Substring(algorithm.GetType().Name.LastIndexOf(".") + 1,
algorithm.GetType().Name.Length) + "." + "png";
//write it
new Bitmap(algorithm.Encode(coverfilepath,
new TextMessage(File.ReadAllText(messagefilepath)), 0)).Save(tempdir);
}
}
catch (Exception)
{
//just go onto the next one...
errors.Append("Error: Could not process: " + imagefile + " with " + messagefile + "\n");
}
//end image loop
//cleanup to speed up memory
GC.Collect();
}
}
}
return(errors.ToString());
}
