/*
 * Copyright (c) 2011, Harald Kuhr
 * 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 "TwelveMonkeys" 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.
 */

package com.twelvemonkeys.imageio.plugins.icns;

import com.twelvemonkeys.imageio.spi.ProviderInfo;
import com.twelvemonkeys.imageio.util.IIOUtil;

import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
import java.io.IOException;
import java.util.Locale;

/**
 * ICNSImageReaderSpi
 *
 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
 * @author last modified by $Author: haraldk$
 * @version $Id: ICNSImageReaderSpi.java,v 1.0 25.10.11 18:41 haraldk Exp$
 */
public final class ICNSImageReaderSpi extends ImageReaderSpi{
    public ICNSImageReaderSpi() {
        this(IIOUtil.getProviderInfo(ICNSImageReaderSpi.class));
    }

    private ICNSImageReaderSpi(final ProviderInfo pProviderInfo) {
        super(
                pProviderInfo.getVendorName(),
                pProviderInfo.getVersion(),
                new String[]{"icns", "ICNS"},
                new String[]{"icns"},
                new String[]{
                        "image/x-apple-icons",               // Common extension MIME
                },
                "com.twelvemonkeys.imageio.plugins.icns.ICNSImageReader",
                STANDARD_INPUT_TYPE,
                null,
                true, null, null, null, null,
                true,
                null, null,
                null, null
        );
    }

    @Override
    public boolean canDecodeInput(Object source) throws IOException {
        return source instanceof ImageInputStream && canDecode((ImageInputStream) source);
    }

    private static boolean canDecode(ImageInputStream input) throws IOException {
        try {
            input.mark();
            return input.readInt() == ICNS.MAGIC;
        }
        finally {
            input.reset();
        }
    }

    @Override
    public ImageReader createReaderInstance(Object extension) throws IOException {
        return new ICNSImageReader(this);
    }

    @Override
    public String getDescription(Locale locale) {
        return "Apple Icon Image (icns) format Reader";
    }
}
