Provide hex utility for converting bytes to hex string : Hexadecimal « Data Type « Java






  1. Java
  2. Data Type
  3. Hexadecimal

Provide hex utility for converting bytes to hex string

      
/* 
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      may be used to endorse or promote products derived from this software 
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*/
//package com.google.protobuf.util;

import java.io.UnsupportedEncodingException;

/**
 * Provide hex utility for converting bytes to hex string
 * <p>
 * (c) 2009-10 protobuf-java-format. All Rights Reserved.
 *
 * @author eliran.bivas@gmail.com Eliran Bivas
 *         <p/>
 *         Based on the original code by:
 *        http://rgagnon.com/javadetails/java-0596.html
 */
public final class HexUtils {

  static final byte[] HEX_CHARS = { (byte) '0', (byte) '1', (byte) '2',
      (byte) '3', (byte) '4', (byte) '5', (byte) '6', (byte) '7',
      (byte) '8', (byte) '9', (byte) 'a', (byte) 'b', (byte) 'c',
      (byte) 'd', (byte) 'e', (byte) 'f' };
  
  public static String getHexString(byte raw, int minLength) {
    byte[] hex = new byte[2];
    int index = 0;
    int v = raw & 0xFF;
    hex[index++] = HEX_CHARS[v >>> 4];
    hex[index++] = HEX_CHARS[v & 0xF];
    try {
      String hexString = new String(hex, "ASCII");
      StringBuilder builder = new StringBuilder();
      if ( hexString.length() < minLength) {
        int hexLength = minLength - hexString.length();
        while ( hexLength > 0) {
          builder.append('0');
          hexLength--;
        }
      }
      return builder.append(hexString).toString();
    } catch (UnsupportedEncodingException e) {
      throw new IllegalStateException(e);
    }
  }

}








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