HexDump

/**
 * Display a file in hex.
 * 
 * To use this program, specify the name
 * of the file that you want to see.
 * For example, to see a file called test.exe,
 * use the following command line: 
 * 
 * java HexDump test.ext
 * 
 */

package FileIO;

import java.io.*;

/**
 * @author Administrator
 *
 */
public class HexDump {
	/**
	 * @param args
	 */
	public static void main(String[] args) {
		FileInputStream fin;
		
		/*
		 * First make sure that a file has been specified
		 * on the command line.
		 */
		if (1 != args.length) {
			System.out.println("Usage: java HexDump File");
			return ;
		}
		
		// Now, open the file.
		try {
			fin = new FileInputStream(args[0]);
		} catch (FileNotFoundException exc) {
			System.out.println("File Not Found");
			return ;
		}
		
		// Read bytes and display their hexadecimal values.
		try {
			int i;
			int count = 0;
			
			// Read bytes until EOF is encountered.
			do {
				i = fin.read();
				if (-1 != i)
					System.out.printf("%02X ", i);
				
				++count;				
				if (16 == count) {
					System.out.println();
					count = 0;
				}
			} while (-1 != i);
		} catch (IOException exc) {
			System.out.println("Error Reading File");
		}

		// Close the file.
		try {
			fin.close();
		} catch (IOException exc) {
			System.out.println("Error Closing File");
		}
	}
}