/**
    * Logback: the reliable, generic, fast and flexible logging framework.
    * Copyright (C) 1999-2015, QOS.ch. All rights reserved.
    *
    * This program and the accompanying materials are dual-licensed under
    * either the terms of the Eclipse Public License v1.0 as published by
    * the Eclipse Foundation
    *
    *   or (per the licensee's choosing)
   *
   * under the terms of the GNU Lesser General Public License version 2.1
   * as published by the Free Software Foundation.
   */
  package ch.qos.logback.core.encoder;
  
  import java.io.ByteArrayOutputStream;
  
  public class ByteArrayUtil {
  
      // big-endian
      static void writeInt(byte[] byteArray, int offset, int i) {
          for (int j = 0; j < 4; j++) {
              int shift = 24 - j * 8;
              byteArray[offset + j] = (byte) (i >>> shift);
          }
      }
  
      static void writeInt(ByteArrayOutputStream baos, int i) {
          for (int j = 0; j < 4; j++) {
              int shift = 24 - j * 8;
              baos.write((byte) (i >>> shift));
          }
      }
  
      // big-endian
      static int readInt(byte[] byteArray, int offset) {
          int i = 0;
          for (int j = 0; j < 4; j++) {
              int shift = 24 - j * 8;
              i += (byteArray[offset + j] & 0xFF) << shift;
          }
          return i;
      }
  
      static public String toHexString(byte[] ba) {
          StringBuilder sbuf = new StringBuilder();
          for (byte b : ba) {
              String s = Integer.toHexString((int) (b & 0xff));
              if (s.length() == 1) {
                  sbuf.append('0');
              }
              sbuf.append(s);
          }
          return sbuf.toString();
      }
  
      static public byte[] hexStringToByteArray(String s) {
          int len = s.length();
          byte[] ba = new byte[len / 2];
  
          for (int i = 0; i < ba.length; i++) {
              int j = i * 2;
              int t = Integer.parseInt(s.substring(j, j + 2), 16);
              byte b = (byte) (t & 0xFF);
              ba[i] = b;
          }
          return ba;
      }
  }