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/**
* Copyright (c) 2008 The Board of Trustees of The Leland Stanford Junior
* University
*
* 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 org.openflow.util;
import java.math.BigInteger;
public class HexString {
/**
* Convert a string of bytes to a ':' separated hex string
* @param bytes
* @return "0f:ca:fe:de:ad:be:ef"
*/
public static String toHexString(byte[] bytes) {
int i;
StringBuilder ret = new StringBuilder(8*2+7);
String tmp;
for(i=0; i< bytes.length; i++) {
if(i> 0)
ret.append(':');
tmp = Integer.toHexString(U8.f(bytes[i]));
if (tmp.length() == 1)
ret.append('0');
ret.append(tmp);
}
return ret.toString();
}
public static String toHexString(long val, int padTo) {
char arr[] = Long.toHexString(val).toCharArray();
StringBuilder ret = new StringBuilder(8*2+7);
// prepend the right number of leading zeros
int i = 0;
for (; i < (padTo * 2 - arr.length); i++) {
ret.append('0');
if ((i & 1) == 1)
ret.append(':');
}
for (int j = 0; j < arr.length; j++) {
ret.append(arr[j]);
if ((((i + j) & 1) == 1) && (j < (arr.length - 1)))
ret.append(':');
}
return ret.toString();
}
public static String toHexString(long val) {
return toHexString(val, 8);
}
/**
* Convert a string of hex values into a string of bytes
* @param values "0f:ca:fe:de:ad:be:ef"
* @return [15, 5 ,2, 5, 17]
* @throws NumberFormatException If the string can not be parsed
*/
public static byte[] fromHexString(String values) throws NumberFormatException {
String[] octets = values.split(":");
byte[] ret = new byte[octets.length];
for(int i = 0; i < octets.length; i++) {
if (octets[i].length() > 2)
throw new NumberFormatException("Invalid octet length");
ret[i] = Integer.valueOf(octets[i], 16).byteValue();
}
return ret;
}
public static long toLong(String values) throws NumberFormatException {
// Long.parseLong() can't handle HexStrings with MSB set. Sigh.
BigInteger bi = new BigInteger(values.replaceAll(":", ""),16);
if (bi.bitLength() > 64)
throw new NumberFormatException("Input string too big to fit in long: " + values);
return bi.longValue();
}
}