107 lines
2.9 KiB
Java
107 lines
2.9 KiB
Java
/*
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* Copyright 2013 Luciad (http://www.luciad.com)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.luciad.imageio.webp;
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import javax.imageio.ImageReader;
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import javax.imageio.spi.ImageReaderSpi;
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import javax.imageio.stream.ImageInputStream;
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import java.io.IOException;
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import java.nio.ByteOrder;
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import java.util.Arrays;
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import java.util.Locale;
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/**
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*
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*/
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public class WebPImageReaderSpi extends ImageReaderSpi {
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private static final byte[] RIFF = new byte[]{ 'R', 'I', 'F', 'F' };
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private static final byte[] WEBP = new byte[]{ 'W', 'E', 'B', 'P' };
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private static final byte[] VP8_ = new byte[]{ 'V', 'P', '8', ' ' };
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private static final byte[] VP8X = new byte[]{ 'V', 'P', '8', 'X' };
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public WebPImageReaderSpi() {
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super(
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"Luciad",
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"1.0",
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new String[]{ "WebP", "webp" },
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new String[]{ "webp" },
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new String[]{ "image/webp" },
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WebPReader.class.getName(),
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new Class[] { ImageInputStream.class },
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new String[]{ WebPImageWriterSpi.class.getName() },
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false,
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null,
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null,
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null,
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null,
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false,
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null,
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null,
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null,
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null
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);
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}
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@Override
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public ImageReader createReaderInstance( Object extension ) throws IOException {
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return new WebPReader( this );
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}
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@Override
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public boolean canDecodeInput( Object source ) throws IOException {
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if ( !( source instanceof ImageInputStream ) ) {
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return false;
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}
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ImageInputStream stream = ( ImageInputStream ) source;
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byte[] b = new byte[ 4 ];
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ByteOrder oldByteOrder = stream.getByteOrder();
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stream.mark();
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stream.setByteOrder( ByteOrder.LITTLE_ENDIAN );
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try {
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stream.readFully( b );
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if ( !Arrays.equals( b, RIFF ) ) {
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return false;
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}
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long chunkLength = stream.readUnsignedInt();
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long streamLength = stream.length();
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if ( streamLength != -1 && streamLength != chunkLength + 8 ) {
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return false;
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}
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stream.readFully( b );
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if ( !Arrays.equals( b, WEBP ) ) {
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return false;
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}
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stream.readFully( b );
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if ( !Arrays.equals( b, VP8_ ) && !Arrays.equals( b, VP8X ) ) {
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return false;
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}
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} finally {
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stream.setByteOrder( oldByteOrder );
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stream.reset();
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}
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return true;
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}
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@Override
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public String getDescription( Locale locale ) {
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return "WebP Reader";
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}
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}
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