embed.java

基于JPEG图像的数字密写方法 F5算法的JAVA程序

import james.*;
import image.Bmp;

import java.awt.*;
import java.io.*;
import java.util.*;
import java.lang.*;


public class Embed
{
    public static void StandardUsage() {
        System.out.println("F5/JpegEncoder for Java(tm)");
        System.out.println("");
        System.out.println("Program usage: java Embed [Options] \"InputImage\".\"ext\" [\"OutputFile\"[.jpg]]");
        System.out.println("");
        System.out.println("You have the following options:");
        System.out.println("-e <file to embed>\tdefault: embed nothing");
        System.out.println("-p <password>\t\tdefault: \"abc123\", only used when -e is specified");
        System.out.println("-q <quality 0 ... 100>\tdefault: 80");
        System.out.println("-c <comment>\t\tdefault: \"JPEG Encoder Copyright 1998, James R. Weeks and BioElectroMech.  \"");
        System.out.println("");
        System.out.println("\"InputImage\" is the name of an existing image in the current directory.");
        System.out.println("  (\"InputImage may specify a directory, too.) \"ext\" must be .tif, .gif,");
        System.out.println("  or .jpg.");
        System.out.println("Quality is an integer (0 to 100) that specifies how similar the compressed");
        System.out.println("  image is to \"InputImage.\"  100 is almost exactly like \"InputImage\" and 0 is");
        System.out.println("  most dissimilar.  In most cases, 70 - 80 gives very good results.");
        System.out.println("\"OutputFile\" is an optional argument.  If \"OutputFile\" isn't specified, then");
        System.out.println("  the input file name is adopted.  This program will NOT write over an existing");
        System.out.println("  file.  If a directory is specified for the input image, then \"OutputFile\"");
        System.out.println("  will be written in that directory.  The extension \".jpg\" may automatically be");
        System.out.println("  added.");
        System.out.println("");
        System.out.println("Copyright 1998 BioElectroMech and James R. Weeks.  Portions copyright IJG and");
        System.out.println("  Florian Raemy, LCAV.  See license.txt for details.");
        System.out.println("Visit BioElectroMech at www.obrador.com.  Email [e-mail].");
        System.out.println("Steganography added by Andreas Westfeld, [e-mail]");
        System.exit(0);
    }

    public static void main(String args[]) {
	Image image = null;
	FileOutputStream dataOut = null;
	File file, outFile;
	JpegEncoder jpg;
	int i, Quality = 80;
// Check to see if the input file name has one of the extensions:
//     .tif, .gif, .jpg
// If not, print the standard use info.
	boolean haveInputImage = false;
	String embFileName=null;
	String comment="JPEG Encoder Copyright 1998, James R. Weeks and BioElectroMech.  ";
	String password="abc123";
	String inFileName=null;
	String outFileName=null;
	if (args.length < 1)
	    StandardUsage();
	for (i=0; i<args.length; i++) {
	    if (!args[i].startsWith("-")) {
		if (!haveInputImage) {
		    if (!args[i].endsWith(".jpg") && !args[i].endsWith(".tif")
			&& !args[i].endsWith(".gif") && !args[i].endsWith(".bmp"))
			StandardUsage();
		    inFileName = args[i];
		    outFileName = args[i].substring(0, args[i].lastIndexOf(".")) + ".jpg";
		    haveInputImage=true;
		} else {
		    outFileName = args[i];
		    if (outFileName.endsWith(".tif") || outFileName.endsWith(".gif") || outFileName.endsWith(".bmp"))
			outFileName = outFileName.substring(0, outFileName.lastIndexOf("."));
		    if (!outFileName.endsWith(".jpg"))
			outFileName = outFileName.concat(".jpg");
		}
		continue;
	    }
	    if (args.length < i+1) {
		System.out.println("Missing parameter for switch "+args[i]);
		StandardUsage();
	    }
	    if (args[i].equals("-e")) {
		embFileName = args[i+1];
	    } else if (args[i].equals("-p")) {
		password = args[i+1];
	    } else if (args[i].equals("-q")) {
		try {
		    Quality = Integer.parseInt(args[i+1]);
		} catch (NumberFormatException e) {
		    StandardUsage();
		}
	    } else if (args[i].equals("-c")) {
		comment = args[i+1];
	    } else
		System.out.println("Unknown switch "
					+args[i]+" ignored.");
	    i++;
	}
	outFile = new File(outFileName);
	i = 1;
	while (outFile.exists()) {
	    outFile = new File(outFileName.substring(0, outFileName.lastIndexOf(".")) + (i++) + ".jpg");
	    if (i > 100)
		System.exit(0);
	}
	file = new File(inFileName);
	if (file.exists()) {
	    try {
		dataOut = new FileOutputStream(outFile);
	    } catch(IOException e) {}
	    if (inFileName.endsWith(".bmp")) {
		Bmp bmp = new Bmp(inFileName);
		image = bmp.getImage();
	    } else
		image = Toolkit.getDefaultToolkit().getImage(inFileName);
	    jpg = new JpegEncoder(image, Quality, dataOut, comment);
	    if (false)
		jpg.Compress();
	    else {
		try {
		    if (embFileName==null)
			jpg.Compress();
		    else
			jpg.Compress(new FileInputStream(embFileName), password);
		} catch (Exception e) {
		    e.printStackTrace();
		}
	    }
	    try {
		dataOut.close();
	    } catch(IOException e) {}
	}
	else {
	    System.out.println("I couldn't find " + inFileName + ". Is it in another directory?");
	}
	System.exit(0);
    }
}