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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
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 *
 * Modifications:
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package org.glassfish.tyrus.core;

import java.nio.ByteBuffer;

class Masker {
    private volatile ByteBuffer buffer;
    private byte[] mask;
    private int index = 0;

    public Masker(ByteBuffer buffer) {
        this.buffer = buffer;
    }

    public Masker(int mask) {
        this.mask = new byte[4];
        this.mask[0] = (byte) (mask >> 24);
        this.mask[1] = (byte) (mask >> 16);
        this.mask[2] = (byte) (mask >> 8);
        this.mask[3] = (byte) mask;
    }

    byte get() {
        return buffer.get();
    }

    byte[] get(final int size) {
        byte[] bytes = new byte[size];
        buffer.get(bytes);
        return bytes;
    }

    public byte[] unmask(int count) {
        byte[] bytes = get(count);
        if (mask != null) {
            for (int i = 0; i < bytes.length; i++) {
                bytes[i] ^= mask[index++ % ProtocolHandler.MASK_SIZE];
            }
        }

        return bytes;
    }

    public void mask(byte[] target, int location, byte[] bytes, int length) {
        if (bytes != null && target != null) {
            for (int i = 0; i < length; i++) {
                target[location + i] = mask == null
                        ? bytes[i]
                        : (byte) (bytes[i] ^ mask[index++ % ProtocolHandler.MASK_SIZE]);
            }
        }
    }

    public void setBuffer(ByteBuffer buffer) {
        this.buffer = buffer;
    }

    public byte[] getMask() {
        return mask;
    }

    public void readMask() {
        mask = get(ProtocolHandler.MASK_SIZE);
    }
}