/*
* 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;
}
}