/*
* Copyright (C) 2010-2101 Alibaba Group Holding Limited.
*
* 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.otter.shared.common.utils;
import java.io.UnsupportedEncodingException;
import java.math.BigInteger;
import java.nio.ByteBuffer;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang.exception.NestableRuntimeException;
/**
* 提供一些便利的byte处理工具
*
* @author jianghang 2011-10-9 下午06:22:13
* @version 4.0.0
*/
public class ByteUtils {
public static String bigIntToHex(BigInteger big) {
return big.toString(16);
}
public static BigInteger hexToBigInt(String hex) {
return new BigInteger(hex, 16);
}
public static String bytesToString(byte[] bytes) {
try {
return new String(bytes, "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new NestableRuntimeException(e);
}
}
public static byte[] stringToBytes(String string) {
try {
return string.getBytes("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new NestableRuntimeException(e);
}
}
public static String bytesToBase64String(byte[] bytes) {
try {
return new String(Base64.encodeBase64(bytes), "UTF-8");
} catch (UnsupportedEncodingException e) {
throw new NestableRuntimeException(e);
}
}
public static byte[] base64StringToBytes(String string) {
try {
return Base64.decodeBase64(string.getBytes("UTF-8"));
} catch (UnsupportedEncodingException e) {
throw new NestableRuntimeException(e);
}
}
public static byte[] int2bytes(int i) {
byte[] b = new byte[4];
int2bytes(i, b, 0);
return b;
}
public static int bytes2int(byte[] b) {
ByteBuffer buf = ByteBuffer.allocate(4);
buf.put(b);
buf.flip();
return buf.getInt();
}
public static byte[] long2bytes(long l) {
byte[] b = new byte[8];
long2bytes(l, b, 0);
return b;
}
public static long bytes2long(byte[] b) {
ByteBuffer buf = ByteBuffer.allocate(8);
buf.put(b);
buf.flip();
return buf.getLong();
}
public static int int2bytes(int i, byte[] data, int offset) {
data[offset++] = (byte) ((i >> 24) & 0xff);
data[offset++] = (byte) ((i >> 16) & 0xff);
data[offset++] = (byte) ((i >> 8) & 0xff);
data[offset] = (byte) (i & 0xff);
return 4;
}
public static int bytes2int(byte[] data, int offset) {
ByteBuffer buffer = ByteBuffer.wrap(data, offset, 4);
return buffer.getInt();
}
public static int long2bytes(long l, byte[] data, int offset) {
data[offset++] = (byte) ((l >> 56) & 0xff);
data[offset++] = (byte) ((l >> 48) & 0xff);
data[offset++] = (byte) ((l >> 40) & 0xff);
data[offset++] = (byte) ((l >> 32) & 0xff);
data[offset++] = (byte) ((l >> 24) & 0xff);
data[offset++] = (byte) ((l >> 16) & 0xff);
data[offset++] = (byte) ((l >> 8) & 0xff);
data[offset] = (byte) (l & 0xff);
return 8;
}
public static long bytes2long(byte[] data, int offset) {
ByteBuffer buffer = ByteBuffer.wrap(data, offset, 8);
return buffer.getLong();
}
}