hexdump.java

cygwin 是一个在windows平台上运行的unix模拟环境

/* HexDump.java
 * Component: ProperJavaRDP
 * 
 * Revision: $Revision: 1.7 $
 * Author: $Author: telliott $
 * Date: $Date: 2005/09/27 14:15:39 $
 *
 * Copyright (c) 2005 Propero Limited
 *
 * Purpose: Manages debug information for all data
 *          sent and received, outputting in hex format
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
 * USA
 * 
 * (See gpl.txt for details of the GNU General Public License.)
 * 
 */
package net.propero.rdp;

import org.apache.log4j.Logger;
import org.apache.log4j.Level;

public class HexDump {
	static Logger logger = Logger.getLogger(HexDump.class);

    /**
     * Construct a HexDump object, sets logging level to Debug
     */
    public HexDump() {
    	logger.setLevel(Level.DEBUG);
    }

    /**
     * Encode data as hex and output as debug messages along with supplied custom message
     * @param data Array of byte data to be encoded
     * @param msg Message to include with outputted hex debug messages
     */
    public void encode(byte[] data, String msg/*PrintStream out*/) {
	int count = 0;
	String index;
	String number;
	
	logger.debug(msg);
	
	while(count < data.length) {
	    index = Integer.toHexString(count);
	    switch(index.length()) {
	    case(1):
		index = "0000000".concat(index);
		break;
	    case(2):
		index = "000000".concat(index);
		break;
	    case(3):
		index = "00000".concat(index);
		break;
	    case(4):
		index = "0000".concat(index);
		break;
	    case(5):
		index = "000".concat(index);
		break;
	    case(6):
		index = "00".concat(index);
		break;
	    case(7):
		index = "0".concat(index);
		break;
	    case(8):
		break;
	    default:
		return;
	    }
	    
	    index += ": ";
	    //out.print(index + ": ");
	    for(int i = 0; i < 16; i++) {
		if(count >= data.length) {
		    break;
		}
		number = Integer.toHexString((data[count]&0x000000ff));
		switch(number.length()) {
		case(1):
		    number = "0".concat(number);
		    break;
		case(2):
		    break;
		default:
		    logger.debug(index);
		    //out.println("");
		    return;
		}   
		index+= (number + " "); 
		//out.print(number + " ");
		count++;
	    }
	    logger.debug(index);
	    //out.println("");
	}
	
    }
}