Java ByteBuffer Search indexOf(final ByteBuffer haystack, byte[] needle)

Description

index Of

License

Apache License

Declaration

public static int indexOf(final ByteBuffer haystack, byte[] needle) 

Method Source Code

//package com.java2s;
/*//from w w  w. ja  v  a2  s . c o  m
 * Copyright 2012-2016 eiennohito (Tolmachev Arseny)
 *
 * 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;

public class Main {
    public static int indexOf(final ByteBuffer haystack, byte[] needle) {
        return indexOf(haystack, haystack.position(), haystack.limit(), needle);
    }

    public static int indexOf(final ByteBuffer haystack, final int from, final int to, byte[] needle) {
        final byte[] arr = haystack.array();
        final int blen = needle.length - 1;

        int pos = from;
        int j = 0;

        for (; pos < to; ++pos) {
            byte c = arr[pos];
            if (c == needle[j]) {
                if (j == blen) {
                    return pos - j;
                } else
                    j += 1;
            } else if (j != 0) {
                pos -= j;
                j = 0;
            }
        }

        return -1;
    }
}

Related

1. indexOf(ByteBuffer buf, byte value)
2. indexOf(ByteBuffer buffer, byte b)
3. indexOf(ByteBuffer buffer, ByteBuffer pattern)
4. indexOf(ByteBuffer buffer, ByteBuffer pattern)
5. indexOf(final ByteBuffer buf, final int c, final int start, final int end)
6. search(ByteBuffer buffer, int n, byte[] param)
7. unsignedBinarySearch(final ByteBuffer array, int position, final int begin, final int end, final short k)