org.apache.pdfbox.filter.JBIG2Filter.java Source code

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Here is the source code for org.apache.pdfbox.filter.JBIG2Filter.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.pdfbox.filter;

import java.awt.image.BufferedImage;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;

import javax.imageio.ImageIO;
import javax.imageio.ImageReader;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSDictionary;

/**
 * Modeled on the JBIG2Decode filter.
 *
 * thanks to Timo Bhme <timo.boehme@ontochem.com>
 */

public class JBIG2Filter implements Filter {

    /** Log instance. */
    private static final Log log = LogFactory.getLog(JBIG2Filter.class);

    /**
     * Decode JBIG2 data using Java ImageIO library.
     *
     * {@inheritDoc}
     *
     */
    public void decode(InputStream compressedData, OutputStream result, COSDictionary options, int filterIndex)
            throws IOException {
        BufferedImage bi = ImageIO.read(compressedData);
        if (bi != null) {
            DataBuffer dBuf = bi.getData().getDataBuffer();
            if (dBuf.getDataType() == DataBuffer.TYPE_BYTE) {
                result.write(((DataBufferByte) dBuf).getData());
            } else {
                log.error("Image data buffer not of type byte but type " + dBuf.getDataType());
            }
        } else {
            Iterator<ImageReader> reader = ImageIO.getImageReadersByFormatName("JBIG2");
            if (!reader.hasNext()) {
                log.error("Can't find an ImageIO plugin to decode the JBIG2 encoded datastream.");
            } else {
                log.error("Something went wrong when decoding the JBIG2 encoded datastream.");
            }
        }
    }

    /**
    * {@inheritDoc}
    */
    public void encode(InputStream rawData, OutputStream result, COSDictionary options, int filterIndex)
            throws IOException {
        System.err.println("Warning: JBIG2.encode is not implemented yet, skipping this stream.");
    }
}