Are the bytes starting from pos equal to the target Bytes in ByteBuffer? - Java java.nio

Java examples for java.nio:ByteBuffer

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Description

Are the bytes starting from pos equal to the target Bytes in ByteBuffer?

Demo Code


//package com.java2s;
import java.nio.ByteBuffer;

public class Main {
    /**//from   w  w  w .j  a v a 2  s  .c om
     * Are the bytes starting from pos equal to the targetBytes?
     */
    public static boolean startsWith(int pos, ByteBuffer buf,
            byte[] targetBytes) {
        int remaining = buf.limit() - pos;

        if (targetBytes.length > remaining) {
            return false;
        }

        for (int i = 0; i < targetBytes.length; i++) {
            if (targetBytes[i] != buf.get(i + pos)) {
                return false;
            }
        }

        return true;
    }

    /**
     * Do any of the targetByte arrays begin at position pos in buf?
     */
    public static boolean startsWith(int pos, ByteBuffer buf,
            byte[][] targetBytes) {
        int limit = buf.limit();
        int remaining = limit - pos;

        if (remaining == 0) {
            return false;
        }

        byte b = buf.get(pos);
        for (byte[] target : targetBytes) {
            if (remaining >= target.length && target[0] == b) {
                if (_byteArrayOverlaps(pos, 1, buf, target)) {
                    return true;
                }
            }
        }

        return false;
    }

    private static boolean _byteArrayOverlaps(int pos,
            int byteArrayStartIndex, ByteBuffer buf, byte[] target) {
        byte b;
        for (int i = byteArrayStartIndex; i < target.length; i++) {
            b = buf.get(pos + i);

            if (b != target[i]) {
                return false;
            }
        }

        return true;
    }
}

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