/FileExtraction/Java_unseen/Kegbot_kegbot-android/kegtab/src/androidTest/java/org/kegbot/kegboard/HexDump.java
/*
 * Copyright 2003-2020 The Kegbot Project contributors <info@kegbot.org>
 *
 * This file is part of the Kegtab package from the Kegbot project. For
 * more information on Kegtab or Kegbot, see <http://kegbot.org/>.
 *
 * Kegtab is free software: you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 2.
 *
 * Kegtab is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with Kegtab. If not, see <http://www.gnu.org/licenses/>.
 */

package org.kegbot.kegboard;

/**
 * Clone of Android's non-public HexDump class, for use in debugging. Cosmetic (code style) 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;
  }
}
