com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream.java Source code

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Here is the source code for com.liferay.portal.kernel.io.unsync.UnsyncByteArrayInputStream.java

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/**
 * Copyright (c) 2000-present Liferay, Inc. All rights reserved.
 *
 * 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.
 */

package com.liferay.portal.kernel.io.unsync;

import java.io.InputStream;

/**
 * <p>
 * See https://issues.liferay.com/browse/LPS-6648.
 * </p>
 *
 * @author Shuyang Zhou
 */
public class UnsyncByteArrayInputStream extends InputStream {

    public UnsyncByteArrayInputStream(byte[] buffer) {
        this.buffer = buffer;

        index = 0;
        capacity = buffer.length;
    }

    public UnsyncByteArrayInputStream(byte[] buffer, int offset, int length) {
        this.buffer = buffer;

        index = offset;
        capacity = Math.min(buffer.length, offset + length);
        markIndex = offset;
    }

    @Override
    public int available() {
        return capacity - index;
    }

    @Override
    public void mark(int readAheadLimit) {
        markIndex = index;
    }

    @Override
    public boolean markSupported() {
        return true;
    }

    @Override
    public int read() {
        if (index < capacity) {
            return buffer[index++] & 0xff;
        }

        return -1;
    }

    @Override
    public int read(byte[] bytes) {
        return read(bytes, 0, bytes.length);
    }

    @Override
    public int read(byte[] bytes, int offset, int length) {
        if (length <= 0) {
            return 0;
        }

        if (index >= capacity) {
            return -1;
        }

        int read = length;

        if ((index + read) > capacity) {
            read = capacity - index;
        }

        System.arraycopy(buffer, index, bytes, offset, read);

        index += read;

        return read;
    }

    @Override
    public void reset() {
        index = markIndex;
    }

    @Override
    public long skip(long skip) {
        if (skip < 0) {
            return 0;
        }

        if ((skip + index) > capacity) {
            skip = capacity - index;
        }

        index += skip;

        return skip;
    }

    protected byte[] buffer;
    protected int capacity;
    protected int index;
    protected int markIndex;

}