com.gc.iotools.fmt.detectors.GifDetector Maven / Gradle / Ivy

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package com.gc.iotools.fmt.detectors;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.gc.iotools.fmt.base.AbstractFormatDetector;
import com.gc.iotools.fmt.base.FormatEnum;

/*
 * Copyright (c) 2008, Davide Simonetti
 * All rights reserved.
 * Redistribution and use in source and binary forms, 
 * with or without modification, are permitted provided that the following 
 * conditions are met:
 *  * Redistributions of source code must retain the above copyright notice, 
 *    this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice, 
 *    this list of conditions and the following disclaimer in the documentation 
 *    and/or other materials provided with the distribution.
 *  * Neither the name of Davide Simonetti nor the names of its contributors may
 *    be used to endorse or promote products derived from this software without 
 *    specific prior written permission.
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 * ARE DISCLAIMED. 
 * IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY 
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
 */

public class GifDetector extends AbstractFormatDetector {
	private static final Pattern GIF_PATTERN = Pattern.compile("GIF8[7-9]a");

	public GifDetector() {
		super(6, FormatEnum.GIF);
	}

	public boolean detect(final byte[] readedBytes) {
		boolean result = false;
		if (readedBytes != null) {
			final String string = new String(readedBytes);
			final Matcher matcher = GIF_PATTERN.matcher(string);
			result = matcher.matches();
		}
		return result;
	}
}