HexDump.java :  » Installer » VAInstall » com » ice » util » Java Open Source

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 )
    {
    int      rows, residue, i, j;
    byte[]    save_buf= new byte[ ROW_BYTES+2 ];
    byte[]    hex_buf = new byte[ 4 ];
    byte[]    idx_buf = new byte[ 8 ];
    byte[]    hex_chars = new byte[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[(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] > 0xD9)
          save_buf[j] = '.';
        }

      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[(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] > 0xD9)
          save_buf[j] = '.';
        }
        
      for ( /*j INHERITED*/ ; j < ROW_BYTES ; j++)
        {
        save_buf[j] = ' ';
        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 );
    }

  }