Java byte数组到long的转换
/*
* @(#)SignedByteConverter.java
*
* This program 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; either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Library General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
package cn.edu.ynu.sei.dict.util;
/**
* Convert the signed byte(s) into a integer or hexadecimal digit form.
* @author 88250
* @version 1.0.1.4, Feb 3, 2008
*/
public class SignedByteConverter {
/**
* convert signed one byte into a 32-bit integer
* @param b byte
* @return convert result
*/
public static int unsignedByteToInt(byte b) {
return (int) b & 0xFF;
}
/**
* convert signed one byte into a hexadecimal digit
* @param b byte
* @return convert result
*/
public static String byteToHex(byte b) {
int i = b & 0xFF;
return Integer.toHexString(i);
}
/**
* convert signed 4 bytes into a 32-bit integer
* @param buf bytes buffer
* @param pos beginning <code>byte</code>> for converting
* @return convert result
*/
public static long unsigned4BytesToInt(byte[] buf, int pos) {
int firstByte = 0;
int secondByte = 0;
int thirdByte = 0;
int fourthByte = 0;
int index = pos;
firstByte = (0x000000FF & ((int) buf[index]));
secondByte = (0x000000FF & ((int) buf[index + 1]));
thirdByte = (0x000000FF & ((int) buf[index + 2]));
fourthByte = (0x000000FF & ((int) buf[index + 3]));
index = index + 4;
return ((long) (firstByte << 24 | secondByte << 16 |
thirdByte << 8 | fourthByte)) & 0xFFFFFFFFL;
}
}
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