/**
* add package length to index of offset,length contribute for two bytes
*
* @param packageContent
*/
public static byte[] addLength(int offset, byte[] packageContent) {
if (offset > packageContent.length - 1 || offset < 0) {
offset = lengthOffset;
// log.warn("The offset is negative or zero,used default value.");
}
byte[] temp = new byte[packageContent.length + 2];
replace(temp, 0, get(packageContent, 0, offset));
replace(temp, offset, getbyte(temp.length));
replace(temp, offset + 2, get(packageContent, offset, packageContent.length - offset));
return temp;
}
