Searches for a pattern of bytes in the given ByteBuffer starting at the given offset. - Java java.nio

Java examples for java.nio:ByteBuffer

  1. HOME
  2. Java
  3. java.nio
  4. ByteBuffer

Description

Searches for a pattern of bytes in the given ByteBuffer starting at the given offset.

Demo Code

/*//  w  w w.jav a 2s.  c o  m
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.nio.ByteBuffer;

public class Main {
    /**
     * Searches for a pattern of bytes in the given buffer starting at the
     * given offset.
     * @return the offset of the pattern if a match is found, -1 otherwise
     */
    public static int findRange(ByteBuffer buffer, int start, byte[] pattern) {
        byte firstByte = pattern[0];
        int limit = buffer.limit() - pattern.length;
        for (int i = start; i < limit; ++i) {
            if ((firstByte == buffer.get(i))
                    && matchesRange(buffer, i, pattern)) {
                return i;
            }
        }
        return -1;
    }

    /**
     * Matches a pattern of bytes against the given buffer starting at the given
     * offset.
     */
    public static boolean matchesRange(ByteBuffer buffer, int start,
            byte[] pattern) {
        for (int i = 0; i < pattern.length; ++i) {
            if (pattern[i] != buffer.get(start + i)) {
                return false;
            }
        }
        return true;
    }
}

Related Tutorials