Writes a sequence of hexidecimal values into the given buffer, where every two characters represent one byte value. - Java java.nio

Java examples for java.nio:ByteBuffer Int

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Description

Writes a sequence of hexidecimal values into the given buffer, where every two characters represent one byte value.

Demo Code

/*/*from   w  ww.j  a  v a2 s.c  om*/
Copyright (c) 2005 Health Market Science, Inc.

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library 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
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
USA

You can contact Health Market Science at info@healthmarketscience.com
or at the following address:

Health Market Science
2700 Horizon Drive
Suite 200
King of Prussia, PA 19406
 */
//package com.java2s;

import java.io.IOException;

import java.nio.ByteBuffer;

public class Main {
    /**
     * Writes a sequence of hexidecimal values into the given buffer, where
     * every two characters represent one byte value.
     */
    public static void writeHexString(ByteBuffer buffer, String hexStr)
            throws IOException {
        char[] hexChars = hexStr.toCharArray();
        if ((hexChars.length % 2) != 0) {
            throw new IOException("Hex string length must be even");
        }
        for (int i = 0; i < hexChars.length; i += 2) {
            String tmpStr = new String(hexChars, i, 2);
            buffer.put((byte) Long.parseLong(tmpStr, 16));
        }
    }
}

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