content: /*
   * Copyright (C) 2016-2023 ActionTech.
   * based on code by MyCATCopyrightHolder Copyright (c) 2013, OpenCloudDB/MyCAT.
   * License: http://www.gnu.org/licenses/gpl.html GPL version 2 or higher.
   */
  package com.actiontech.dble.util;
  
  import java.nio.charset.Charset;
  import java.util.Date;
  
  public final class ByteUtil {
      private ByteUtil() {
      }
  
      /**
       * compare to number or dicamal ascii byte array, for number :123456 ,store
       * to array [1,2,3,4,5,6]
       *
       * @param b1
       * @param b2
       * @return -1 means b1 < b2, or 0 means b1=b2 else return 1
       */
      public static int compareNumberByte(byte[] b1, byte[] b2) {
          if (b1 == null || b1.length == 0) {
              return -1;
          } else if (b2 == null || b2.length == 0) {
              return 1;
          }
          boolean isNegetive = b1[0] == 45 || b2[0] == 45;
          if (!isNegetive && b1.length != b2.length) {
              return b1.length - b2.length;
          }
          int len = Math.min(b1.length, b2.length);
          int result = 0;
          int index = -1;
          for (int i = 0; i < len; i++) {
              int b1val = b1[i];
              int b2val = b2[i];
              if (b1val > b2val) {
                  result = 1;
                  index = i;
                  break;
              } else if (b1val < b2val) {
                  index = i;
                  result = -1;
                  break;
              }
          }
          if (index == 0) {
              // first byte compare
              return result;
          } else {
              if (b1.length != b2.length) {
  
                  int lenDelta = b1.length - b2.length;
                  return isNegetive ? 0 - lenDelta : lenDelta;
  
              } else {
                  return isNegetive ? 0 - result : result;
              }
          }
      }
  
      public static byte[] compareNumberArray2(byte[] b1, byte[] b2, int order) {
          if (b1.length <= 0 && b2.length > 0) {
              return b2;
          }
          if (b1.length > 0 && b2.length <= 0) {
              return b1;
          }
          int len = b1.length > b2.length ? b1.length : b2.length;
          for (int i = 0; i < len; i++) {
              if (b1[i] != b2[i]) {
                  if (order == 1) {
                      return ((b1[i] & 0xff) - (b2[i] & 0xff)) > 0 ? b1 : b2;
                  } else {
                      return ((b1[i] & 0xff) - (b2[i] & 0xff)) > 0 ? b2 : b1;
                  }
              }
          }
  
          return b1;
      }
  
      public static byte[] getBytes(short data) {
          byte[] bytes = new byte[2];
          bytes[0] = (byte) (data & 0xff);
          bytes[1] = (byte) ((data & 0xff00) >> 8);
          return bytes;
      }
  
      public static byte[] getBytes(char data) {
          byte[] bytes = new byte[2];
          bytes[0] = (byte) (data);
          bytes[1] = (byte) (data >> 8);
          return bytes;
      }
  
      public static byte[] getBytes(int data) {
          byte[] bytes = new byte[4];
          bytes[0] = (byte) (data & 0xff);
          bytes[1] = (byte) ((data & 0xff00) >> 8);
          bytes[2] = (byte) ((data & 0xff0000) >> 16);
          bytes[3] = (byte) ((data & 0xff000000) >> 24);
          return bytes;
      }
  
      public static byte[] getBytes(long data) {
          byte[] bytes = new byte[8];
          bytes[0] = (byte) (data & 0xff);
          bytes[1] = (byte) ((data >> 8) & 0xff);
          bytes[2] = (byte) ((data >> 16) & 0xff);
          bytes[3] = (byte) ((data >> 24) & 0xff);
          bytes[4] = (byte) ((data >> 32) & 0xff);
          bytes[5] = (byte) ((data >> 40) & 0xff);
          bytes[6] = (byte) ((data >> 48) & 0xff);
          bytes[7] = (byte) ((data >> 56) & 0xff);
          return bytes;
      }
  
      public static byte[] getBytes(float data) {
          int intBits = Float.floatToIntBits(data);
          return getBytes(intBits);
      }
  
      public static byte[] getBytes(double data) {
          long intBits = Double.doubleToLongBits(data);
          return getBytes(intBits);
      }
  
      public static byte[] getBytes(String data, String charsetName) {
          Charset charset = Charset.forName(charsetName);
          return data.getBytes(charset);
      }
  
      public static byte[] getBytes(String data) {
          return getBytes(data, "GBK");
      }
  
      public static byte[] getBytes(Date date, boolean isTime) {
          if (isTime) {
              return getBytesFromTime(date);
          } else {
              return getBytesFromDate(date);
          }
      }
  
      public static short getShort(byte[] bytes) {
          return Short.parseShort(new String(bytes));
      }
  
      public static char getChar(byte[] bytes) {
          return (char) ((0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)));
      }
  
      public static int getInt(byte[] bytes) {
          return Integer.parseInt(new String(bytes));
          // return (0xff & bytes[0]) | (0xff00 & (bytes[1] << 8)) | (0xff0000 &
          // (bytes[2] << 16)) | (0xff000000 & (bytes[3] << 24));
      }
  
      public static long getLong(byte[] bytes) {
          return Long.parseLong(new String(bytes));
          // return(0xffL & (long)bytes[0]) | (0xff00L & ((long)bytes[1] << 8)) |
          // (0xff0000L & ((long)bytes[2] << 16)) | (0xff000000L & ((long)bytes[3]
          // << 24))
          // | (0xff00000000L & ((long)bytes[4] << 32)) | (0xff0000000000L &
          // ((long)bytes[5] << 40)) | (0xff000000000000L & ((long)bytes[6] <<
          // 48)) | (0xff00000000000000L & ((long)bytes[7] << 56));
      }
  
      public static double getDouble(byte[] bytes) {
          return Double.parseDouble(new String(bytes));
      }
  
      public static float getFloat(byte[] bytes) {
          return Float.parseFloat(new String(bytes));
      }
  
      public static String getString(byte[] bytes, String charsetName) {
          return new String(bytes, Charset.forName(charsetName));
      }
  
      public static String getString(byte[] bytes) {
          return getString(bytes, "UTF-8");
      }
  
      public static String getDate(byte[] bytes) {
          return new String(bytes);
      }
  
      public static String getTime(byte[] bytes) {
          return new String(bytes);
      }
  
      public static String getTimestmap(byte[] bytes) {
          return new String(bytes);
      }
  
      private static byte[] getBytesFromTime(Date date) {
          int day = 0;
          int hour = DateUtil.getHour(date);
          int minute = DateUtil.getMinute(date);
          int second = DateUtil.getSecond(date);
          int microSecond = DateUtil.getMicroSecond(date);
          byte[] bytes = null;
          byte[] tmp = null;
          if (hour == 0 && minute == 0 && second == 0 && microSecond == 0) {
              bytes = new byte[1];
              bytes[0] = (byte) 0;
          } else if (microSecond == 0) {
              bytes = new byte[1 + 8];
              bytes[0] = (byte) 8;
              bytes[1] = (byte) 0; // is_negative (1) -- (1 if minus, 0 for plus)
              tmp = getBytes(day);
              bytes[2] = tmp[0];
              bytes[3] = tmp[1];
              bytes[4] = tmp[2];
              bytes[5] = tmp[3];
              bytes[6] = (byte) hour;
              bytes[7] = (byte) minute;
              bytes[8] = (byte) second;
          } else {
              bytes = new byte[1 + 12];
              bytes[0] = (byte) 12;
              bytes[1] = (byte) 0; // is_negative (1) -- (1 if minus, 0 for plus)
              tmp = getBytes(day);
              bytes[2] = tmp[0];
              bytes[3] = tmp[1];
              bytes[4] = tmp[2];
              bytes[5] = tmp[3];
              bytes[6] = (byte) hour;
              bytes[7] = (byte) minute;
              bytes[8] = (byte) second;
              tmp = getBytes(microSecond);
              bytes[9] = tmp[0];
              bytes[10] = tmp[1];
              bytes[11] = tmp[2];
              bytes[12] = tmp[3];
          }
          return bytes;
      }
  
      private static byte[] getBytesFromDate(Date date) {
          int year = DateUtil.getYear(date);
          int month = DateUtil.getMonth(date);
          int day = DateUtil.getDay(date);
          int hour = DateUtil.getHour(date);
          int minute = DateUtil.getMinute(date);
          int second = DateUtil.getSecond(date);
          int microSecond = DateUtil.getMicroSecond(date);
          byte[] bytes = null;
          byte[] tmp = null;
          if (year == 0 && month == 0 && day == 0 && hour == 0 && minute == 0 && second == 0 && microSecond == 0) {
              bytes = new byte[1];
              bytes[0] = (byte) 0;
          } else if (hour == 0 && minute == 0 && second == 0 && microSecond == 0) {
              bytes = new byte[1 + 4];
              bytes[0] = (byte) 4;
              tmp = getBytes((short) year);
              bytes[1] = tmp[0];
              bytes[2] = tmp[1];
              bytes[3] = (byte) month;
              bytes[4] = (byte) day;
          } else if (microSecond == 0) {
              bytes = new byte[1 + 7];
              bytes[0] = (byte) 7;
              tmp = getBytes((short) year);
              bytes[1] = tmp[0];
              bytes[2] = tmp[1];
              bytes[3] = (byte) month;
              bytes[4] = (byte) day;
              bytes[5] = (byte) hour;
              bytes[6] = (byte) minute;
              bytes[7] = (byte) second;
          } else {
              bytes = new byte[1 + 11];
              bytes[0] = (byte) 11;
              tmp = getBytes((short) year);
              bytes[1] = tmp[0];
              bytes[2] = tmp[1];
              bytes[3] = (byte) month;
              bytes[4] = (byte) day;
              bytes[5] = (byte) hour;
              bytes[6] = (byte) minute;
              bytes[7] = (byte) second;
              tmp = getBytes(microSecond);
              bytes[8] = tmp[0];
              bytes[9] = tmp[1];
              bytes[10] = tmp[2];
              bytes[11] = tmp[3];
          }
          return bytes;
      }
  
  }
  