/*

 * Copyright (c) 2008, 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.tiff;



import com.twelvemonkeys.imageio.spi.ProviderInfo;

import com.twelvemonkeys.lang.SystemUtil;

import com.twelvemonkeys.imageio.util.IIOUtil;



import javax.imageio.ImageReader;

import javax.imageio.spi.ImageReaderSpi;

import javax.imageio.spi.ServiceRegistry;

import javax.imageio.stream.ImageInputStream;

import java.io.IOException;

import java.util.Locale;



/**

 * TIFFImageReaderSpi

 * <p/>

 *

 * @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>

 * @version $Id: TIFFImageReaderSpi.java,v 1.1 2003/12/02 16:45:00 wmhakur Exp $

 */

public class TIFFImageReaderSpi extends ImageReaderSpi {



    final static boolean TIFF_CLASSES_AVAILABLE = SystemUtil.isClassAvailable("com.twelvemonkeys.imageio.plugins.tiff.TIFFImageReader");



    /**

     * Creates a {@code TIFFImageReaderSpi}.

     */

    public TIFFImageReaderSpi() {

        this(IIOUtil.getProviderInfo(TIFFImageReaderSpi.class));    

    }



    private TIFFImageReaderSpi(final ProviderInfo pProviderInfo) {

        super(

                pProviderInfo.getVendorName(), // Vendor name

                pProviderInfo.getVersion(), // Version

                TIFF_CLASSES_AVAILABLE ? new String[]{"tiff", "TIFF"} : new String[] {""}, // Names

                TIFF_CLASSES_AVAILABLE ? new String[]{"tiff", "tif"} : null, // Suffixes

                TIFF_CLASSES_AVAILABLE ? new String[]{"image/tiff", "image/x-tiff"} : null, // Mime-types

                "com.twelvemonkeys.imageio.plugins.tiff.TIFFImageReader", // Writer class name..?

                ImageReaderSpi.STANDARD_INPUT_TYPE, // Output types

                new String[]{"com.twelvemonkeys.imageio.plugins.tiff.TIFFImageWriterSpi"}, // Writer SPI names

                true, // Supports standard stream metadata format

                null, // Native stream metadata format name

                null, // Native stream metadata format class name

                null, // Extra stream metadata format names

                null, // Extra stream metadata format class names

                true, // Supports standard image metadata format

                null, // Native image metadata format name

                null, // Native image metadata format class name

                null, // Extra image metadata format names

                null  // Extra image metadata format class names

        );

    }



    public boolean canDecodeInput(Object source) throws IOException {

        return source instanceof ImageInputStream && TIFF_CLASSES_AVAILABLE && canDecode((ImageInputStream) source);

    }





    static boolean canDecode(ImageInputStream pInput) throws IOException {

        try {

            pInput.mark();

            int byte0 = pInput.read(); // Byte order 1 (M or I)

            int byte1 = pInput.read(); // Byte order 2 (always same as 1)

            int byte2 = pInput.read(); // Version number 1 (M: 0, I: 42)

            int byte3 = pInput.read(); // Version number 2  (M: 42, I: 0)



            // Test for Motorola or Intel byte order, and version number == 42

            if ((byte0 == 'M' && byte1 == 'M' && byte2 == 0 && byte3 == 42)

                    || (byte0 == 'I' && byte1 == 'I' && byte2 == 42 && byte3 == 0)) {

                return true;

            }



        }

        finally {

            pInput.reset();

        }



        return false;

    }



    public ImageReader createReaderInstance(Object extension) throws IOException {

        return new TIFFImageReader(this);

    }



    public String getDescription(Locale locale) {

        return "Tagged Image File Format (TIFF) image reader";

    }



    @SuppressWarnings({"deprecation"})

    @Override

    public void onRegistration(ServiceRegistry registry, Class<?> category) {

        if (!TIFF_CLASSES_AVAILABLE) {

            IIOUtil.deregisterProvider(registry, this, category);

        }

    }

}