Java Convert via ByteBuffer stringToLong(String offsetString)

Description

string To Long

License

Apache License

Declaration

public static long stringToLong(String offsetString) 

Method Source Code

//package com.java2s;
/*/*from   w  ww.  j  a  va 2  s  .  c o  m*/
 * Copyright (c) 2016 Red Hat, Inc., Rob Stryker, and Contributors
 *
 * 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.
 */

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

public class Main {
    public static long stringToLong(String offsetString) {
        if (offsetString.charAt(0) == '0') {
            if (offsetString.length() > 1 && (offsetString.charAt(1) == 'x' || offsetString.charAt(1) == 'X')) {
                String ss = offsetString.substring(2);
                try {
                    return Long.parseLong(ss, 16);
                } catch (NumberFormatException nfe) {
                    // It's probably out of bounds, if it's a quad, so let's 
                    // try hex2bytes and get a long from that
                    byte[] bytes = hex2Bytes(ss);
                    ByteBuffer bb = ByteBuffer.allocate(8).wrap(bytes).order(ByteOrder.BIG_ENDIAN);
                    long l = bb.getLong();
                    return l;
                }
            }
            return Long.parseLong(offsetString, 8);
        }
        return Long.parseLong(offsetString);
    }

    public static byte[] hex2Bytes(String s) {
        int len = s.length();
        byte[] data = new byte[len / 2];
        for (int i = 0; i < len; i += 2) {
            data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4) + Character.digit(s.charAt(i + 1), 16));
        }
        return data;
    }
}

Related

1. stringsToBinary(final String strings[])
2. stringToBytes(final String inString)
3. stringToBytes(String str)
4. StringToData(String conv, boolean isRe, int number)
5. stringToIpAddress(String s)
6. stringToLongUnknownLength(String str, int startIndex)
7. to32BitsLongArray(byte[] data, boolean bigEndian)
8. toArray(final byte[] byteArray, final int sizeLimit)
9. toArray(int value)