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/*
* Copyright 2014 Open Networking Laboratory
*
* 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.onlab.util;
public final class HexString {
private HexString() {
}
/**
* Convert a string of bytes to a ':' separated hex string.
*
* @param bytes string of bytes to convert
* @return "0f:ca:fe:de:ad:be:ef"
*/
public static String toHexString(final byte[] bytes) {
if (bytes == null) {
return "(null)";
}
int i;
StringBuilder ret = new StringBuilder(bytes.length * 3 - 1);
String tmp;
for (i = 0; i < bytes.length; i++) {
if (i > 0) {
ret.append(':');
}
tmp = Integer.toHexString((bytes[i] & 0xff));
if (tmp.length() == 1) {
ret.append('0');
}
ret.append(tmp);
}
return ret.toString();
}
public static String toHexString(final long val, final int padTo) {
char[] arr = Long.toHexString(val).toCharArray();
StringBuilder ret = new StringBuilder(padTo * 3 - 1);
// prepend the right number of leading zeros
int i = 0;
for (; i < (padTo * 2 - arr.length); i++) {
ret.append('0');
if ((i % 2) != 0) {
ret.append(':');
}
}
for (int j = 0; j < arr.length; j++) {
ret.append(arr[j]);
if ((((i + j) % 2) != 0) && (j < (arr.length - 1))) {
ret.append(':');
}
}
return ret.toString();
}
public static String toHexString(final 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(final String values) {
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 value) {
String[] octets = value.split(":");
if (octets.length > 8) {
throw new NumberFormatException("Input string is too big to fit in long: " + value);
}
long l = 0;
for (String octet: octets) {
if (octet.length() > 2) {
throw new NumberFormatException(
"Each colon-separated byte component must consist of 1 or 2 hex digits: " + value);
}
short s = Short.parseShort(octet, 16);
l = (l << 8) + s;
}
return l;
}
}
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