com.liferay.portal.kernel.flash.FlashMagicBytesUtil.java Source code

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Here is the source code for com.liferay.portal.kernel.flash.FlashMagicBytesUtil.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.flash;

import com.liferay.portal.kernel.util.ArrayUtil;

import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;

/**
 * @author Brian Wing Shun Chan
 * @author Mika Koivisto
 */
public class FlashMagicBytesUtil {

    public static Result check(InputStream inputStream) throws IOException {
        PushbackInputStream pushbackInputStream = new PushbackInputStream(inputStream, 3);

        byte[] magicBytes = new byte[3];

        int length = pushbackInputStream.read(magicBytes);

        if (length < 0) {
            return new Result(false, inputStream);
        }

        pushbackInputStream.unread(magicBytes, 0, length);

        inputStream = pushbackInputStream;

        if (ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[0], magicBytes)
                || ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[1], magicBytes)
                || ArrayUtil.containsAll(_FLASH_MAGIC_BYTES[2], magicBytes)) {

            return new Result(true, inputStream);
        }

        return new Result(false, inputStream);
    }

    public static class Result {

        public InputStream getInputStream() {
            return _inputStream;
        }

        public boolean isFlash() {
            return _flash;
        }

        private Result(boolean flash, InputStream inputStream) {
            _flash = flash;
            _inputStream = inputStream;
        }

        private final boolean _flash;
        private final InputStream _inputStream;

    }

    private static final byte[][] _FLASH_MAGIC_BYTES = { { 0x46, 0x57, 0x53 }, { 0x43, 0x57, 0x53 },
            { 0x5a, 0x57, 0x53 } };

}