TarTool example source code file (HexDump.java)

This example TarTool source code file (HexDump.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - TarTool tags/keywords

a, d, hexdump, io, printwriter, row_bytes, row_bytes, row_half, row_half, row_qtr1, row_qtr1, row_qtr2, string, string, test

The TarTool HexDump.java source code

package com.ice.util;

import java.lang.*;
import java.io.*;


public class
HexDump
	{
	private static final int		ROW_BYTES = 16;
	private static final int		ROW_QTR1 = 3;
	private static final int		ROW_HALF = 7;
	private static final int		ROW_QTR2 = 11;

	public static void
	dumpHexData( PrintStream out, String title, byte[] buf, int numBytes )
		{
		PrintWriter wrtr =
			new PrintWriter( new OutputStreamWriter( out ) );

		HexDump.dumpHexData( wrtr, title, buf, 0, numBytes );
		}

	public static void
	dumpHexData(
			PrintWriter out, String title,
			byte[] buf, int offset, int numBytes )
		{
		int			rows, residue, i, j;
		byte[]		save_buf= new byte[ ROW_BYTES+2 ];
		char[]		hex_buf = new char[ 4 ];
		char[]		idx_buf = new char[ 8 ];
		char[]		hex_chars = new char[20];
		
		hex_chars[0] = '0';
		hex_chars[1] = '1';
		hex_chars[2] = '2';
		hex_chars[3] = '3';
		hex_chars[4] = '4';
		hex_chars[5] = '5';
		hex_chars[6] = '6';
		hex_chars[7] = '7';
		hex_chars[8] = '8';
		hex_chars[9] = '9';
		hex_chars[10] = 'A';
		hex_chars[11] = 'B';
		hex_chars[12] = 'C';
		hex_chars[13] = 'D';
		hex_chars[14] = 'E';
		hex_chars[15] = 'F';
		
		out.println( title + " - " + numBytes + " bytes." );
		rows = numBytes >> 4;
		residue = numBytes & 0x0000000F;
		for ( i = 0 ; i < rows ; i++ )
			{
			int hexVal = (i * ROW_BYTES);
			idx_buf[0] = hex_chars[ ((hexVal >> 12) & 15) ];
			idx_buf[1] = hex_chars[ ((hexVal >> 8) & 15) ];
			idx_buf[2] = hex_chars[ ((hexVal >> 4) & 15) ];
			idx_buf[3] = hex_chars[ (hexVal & 15) ];

			String idxStr = new String( idx_buf, 0, 4 );
			out.print( idxStr + ": " );
		
			for ( j = 0 ; j < ROW_BYTES ; j++ )
				{
				save_buf[j] = buf[ offset + (i * ROW_BYTES) + j ];

				hex_buf[0] = hex_chars[ (save_buf[j] >> 4) & 0x0F ];
				hex_buf[1] = hex_chars[ save_buf[j] & 0x0F ];

				out.print( hex_buf[0] );
				out.print( hex_buf[1] );
				out.print( ' ' );

				if ( j == ROW_QTR1 || j == ROW_HALF || j == ROW_QTR2 )
					out.print( " " );

				if ( save_buf[j] < 0x20 || save_buf[j] > 0x7E )
					save_buf[j] = (byte) '.';
				}

			String saveStr = new String( save_buf, 0, j );
			out.println( " | " + saveStr + " |" );
			}
		
		if ( residue > 0 )
			{
			int hexVal = (i * ROW_BYTES);
			idx_buf[0] = hex_chars[ ((hexVal >> 12) & 15) ];
			idx_buf[1] = hex_chars[ ((hexVal >> 8) & 15) ];
			idx_buf[2] = hex_chars[ ((hexVal >> 4) & 15) ];
			idx_buf[3] = hex_chars[ (hexVal & 15) ];

			String idxStr = new String( idx_buf, 0, 4 );
			out.print( idxStr + ": " );

			for ( j = 0 ; j < residue ; j++ )
				{
				save_buf[j] = buf[ offset + (i * ROW_BYTES) + j ];

				hex_buf[0] = hex_chars[ (save_buf[j] >> 4) & 0x0F ];
				hex_buf[1] = hex_chars[ save_buf[j] & 0x0F ];

				out.print( (char)hex_buf[0] );
				out.print( (char)hex_buf[1] );
				out.print( ' ' );

				if ( j == ROW_QTR1 || j == ROW_HALF || j == ROW_QTR2 )
					out.print( " " );

				if ( save_buf[j] < 0x20 || save_buf[j] > 0x7E )
					save_buf[j] = (byte) '.';
				}
				
			for ( /*j INHERITED*/ ; j < ROW_BYTES ; j++ )
				{
				save_buf[j] = (byte) ' ';
				out.print( "   " );
				if ( j == ROW_QTR1 || j == ROW_HALF || j == ROW_QTR2 )
					out.print( " " );
				}
			
			String saveStr = new String( save_buf, 0, j );
			out.println( " | " + saveStr + " |" );
			}
		}

	static public void
	main( String[] args )
		{
		byte[] data = new byte[132];
		for ( int i = 0 ; i < 132 ; ++i ) data[i] = (byte)i;

		HexDump.dumpHexData( System.err, "Test HexDump", data, 132 );
		}

	}