org.jpedal.jbig2.jai.JBIG2ImageReaderSpi Maven / Gradle / Ivy
Show all versions of OpenViewerFX Show documentation
/**
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
*
* (C) Copyright 1997-2008, IDRsolutions and Contributors.
* Main Developer: Simon Barnett
*
* This file is part of JPedal
*
* Copyright (c) 2008, IDRsolutions
* 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 the IDRsolutions 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 IDRsolutions ``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 IDRsolutions 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.
*
* Other JBIG2 image decoding implementations include
* jbig2dec (http://jbig2dec.sourceforge.net/)
* xpdf (http://www.foolabs.com/xpdf/)
*
* The final draft JBIG2 specification can be found at http://www.jpeg.org/public/fcd14492.pdf
*
* All three of the above resources were used in the writing of this software, with methodologies,
* processes and inspiration taken from all three.
*
* ---------------
* JBIG2ImageReaderSpi.java
* ---------------
*/
package org.jpedal.jbig2.jai;
import java.io.IOException;
import java.util.Arrays;
import javax.imageio.ImageReader;
import javax.imageio.spi.ImageReaderSpi;
import javax.imageio.stream.ImageInputStream;
public class JBIG2ImageReaderSpi extends ImageReaderSpi {
public JBIG2ImageReaderSpi() {
super("JPedal", // vendorName
"1.0", // version
new String[]{"JBIG2"}, // names
new String[]{"jb2", "jbig2"}, // suffixes
new String[]{"image/x-jbig2"}, // MIMETypes
"org.jpedal.jbig2.jai.JBIG2ImageReader", // readerClassName
STANDARD_INPUT_TYPE, // inputTypes
null, // writerSpiNames
false, // supportsStandardStreamMetadataFormat
null, // nativeStreamMetadataFormatName
null, // nativeStreamMetadataFormatClassName
null, // extraStreamMetadataFormatNames
null, // extraStreamMetadataFormatClassNames
false, // supportsStandardImageMetadataFormat
null, // nativeImageMetadataFormatName
null, // nativeImageMetadataFormatClassName
null, // extraImageMetadataFormatNames
null); // extraImageMetadataFormatClassNames
}
public boolean canDecodeInput(Object input) throws IOException {
// The input source must be an ImageInputStream because the constructor
// passes STANDARD_INPUT_TYPE (an array consisting of ImageInputStream)
// as the only type of input source that it will deal with to its
// superclass.
if (!(input instanceof ImageInputStream))
return false;
ImageInputStream stream = (ImageInputStream) input;
/** Read and validate the input source's header. */
byte[] header = new byte[8];
try {
// The input source's current position must be preserved so that
// other ImageReaderSpis can determine if they can decode the input
// source's format, should this input source be unable to handle the
// decoding. Because the input source is an ImageInputStream, its
// mark() and reset() methods are called to preserve the current
// position.
stream.mark();
stream.read(header);
stream.reset();
} catch (IOException e) {
return false;
}
byte[] controlHeader = new byte[]{(byte) 151, 74, 66, 50, 13, 10, 26, 10};
return Arrays.equals(controlHeader, header);
}
public ImageReader createReaderInstance(Object extension) throws IOException {
// Inform the JBIG2 image reader that this JBIG2 image reader SPI is the
// originating provider -- the object that creates the JBIG2 image
// reader.
return new JBIG2ImageReader(this);
}
public String getDescription(java.util.Locale locale) {
return "JPedal JBIG2 Image Decoder provided by IDRsolutions. See http://www.jpedal.org/jbig.php";
}
}