content: /*
   * Copyright (C) 2006 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  package com.hoho.android.usbserial.util;
  
  /**
   * Clone of Android's HexDump class, for use in debugging. Cosmetic changes
   * only.
   */
  public class HexDump {
      private final static char[] HEX_DIGITS = {
              '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
      };
  
      public static String dumpHexString(byte[] array) {
          return dumpHexString(array, 0, array.length);
      }
  
      public static String dumpHexString(byte[] array, int offset, int length) {
          StringBuilder result = new StringBuilder();
  
          byte[] line = new byte[16];
          int lineIndex = 0;
  
          result.append("\n0x");
          result.append(toHexString(offset));
  
          for (int i = offset; i < offset + length; i++) {
              if (lineIndex == 16) {
                  result.append(" ");
  
                  for (int j = 0; j < 16; j++) {
                      if (line[j] > ' ' && line[j] < '~') {
                          result.append(new String(line, j, 1));
                      } else {
                          result.append(".");
                      }
                  }
  
                  result.append("\n0x");
                  result.append(toHexString(i));
                  lineIndex = 0;
              }
  
              byte b = array[i];
              result.append(" ");
              result.append(HEX_DIGITS[(b >>> 4) & 0x0F]);
              result.append(HEX_DIGITS[b & 0x0F]);
  
              line[lineIndex++] = b;
          }
  
          if (lineIndex != 16) {
              int count = (16 - lineIndex) * 3;
              count++;
              for (int i = 0; i < count; i++) {
                  result.append(" ");
              }
  
              for (int i = 0; i < lineIndex; i++) {
                  if (line[i] > ' ' && line[i] < '~') {
                      result.append(new String(line, i, 1));
                  } else {
                      result.append(".");
                  }
              }
          }
  
          return result.toString();
      }
  
      public static String toHexString(byte b) {
          return toHexString(toByteArray(b));
      }
  
      public static String toHexString(byte[] array) {
          return toHexString(array, 0, array.length);
      }
  
      public static String toHexString(byte[] array, int offset, int length) {
          char[] buf = new char[length * 2];
  
          int bufIndex = 0;
          for (int i = offset; i < offset + length; i++) {
              byte b = array[i];
              buf[bufIndex++] = HEX_DIGITS[(b >>> 4) & 0x0F];
              buf[bufIndex++] = HEX_DIGITS[b & 0x0F];
          }
  
          return new String(buf);
      }
  
      public static String toHexString(int i) {
          return toHexString(toByteArray(i));
      }
  
      public static byte[] toByteArray(byte b) {
          byte[] array = new byte[1];
          array[0] = b;
          return array;
      }
  
      public static byte[] toByteArray(int i) {
          byte[] array = new byte[4];
  
          array[3] = (byte) (i & 0xFF);
          array[2] = (byte) ((i >> 8) & 0xFF);
          array[1] = (byte) ((i >> 16) & 0xFF);
          array[0] = (byte) ((i >> 24) & 0xFF);
  
          return array;
      }
  
      private static int toByte(char c) {
          if (c >= '0' && c <= '9')
              return (c - '0');
          if (c >= 'A' && c <= 'F')
              return (c - 'A' + 10);
          if (c >= 'a' && c <= 'f')
              return (c - 'a' + 10);
  
          throw new RuntimeException("Invalid hex char '" + c + "'");
      }
  
      public static byte[] hexStringToByteArray(String hexString) {
          int length = hexString.length();
          byte[] buffer = new byte[length / 2];
  
          for (int i = 0; i < length; i += 2) {
              buffer[i / 2] = (byte) ((toByte(hexString.charAt(i)) << 4) | toByte(hexString
                      .charAt(i + 1)));
          }
  
          return buffer;
      }
  }
  