content: /*
   * Copyright 1999-2012 Alibaba Group.
   *  
   * 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.alibaba.cobar.jdbc.util;
  
  /**
   * @author xianmao.hexm 2012-4-28
   */
  public class ByteUtil {
  
      public static final int getLengthWithBytes(byte[] src) {
          int length = src.length;
          if (length < 251) {
              return 1 + length;
          } else if (length < 0x10000L) {
              return 3 + length;
          } else if (length < 0x1000000L) {
              return 4 + length;
          } else {
              return 9 + length;
          }
      }
  
      public static final byte[] getBytesWithLength(int length) {
          byte[] bb = null;
          if (length < 251) {
              bb = new byte[1];
              bb[0] = (byte) length;
          } else if (length < 0x10000L) {
              bb = new byte[3];
              bb[0] = (byte) 252;
              bb[1] = (byte) (length & 0xff);
              bb[2] = (byte) (length >>> 8);
          } else if (length < 0x1000000L) {
              bb = new byte[4];
              bb[0] = (byte) 253;
              bb[1] = (byte) (length & 0xff);
              bb[2] = (byte) (length >>> 8);
              bb[3] = (byte) (length >>> 16);
          } else {
              bb = new byte[9];
              bb[0] = (byte) 254;
              bb[1] = (byte) (length & 0xff);
              bb[2] = (byte) (length >>> 8);
              bb[3] = (byte) (length >>> 16);
              bb[4] = (byte) (length >>> 24);
              bb[5] = (byte) (length >>> 32);
              bb[6] = (byte) (length >>> 40);
              bb[7] = (byte) (length >>> 48);
              bb[8] = (byte) (length >>> 56);
          }
          return bb;
      }
  
  }
  