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The Apache PDFBox library is an open source Java tool for working with PDF documents.
/*
* 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.ColorModel;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PushbackInputStream;
import javax.imageio.ImageIO;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.graphics.color.PDColorSpaceFactory;
/**
* This is used for the JPXDecode filter.
*
* @author Timo Boehme
*
*/
public class JPXFilter implements Filter
{
/** Log instance. */
private static final Log LOG = LogFactory.getLog(JPXFilter.class);
/**
* Decode JPEG and JPEG2000 data using Java ImageIO library.
*
* {@inheritDoc}
*
*/
public void decode(InputStream compressedData, OutputStream result, COSDictionary options, int filterIndex)
throws IOException
{
// skip one LF if there
PushbackInputStream pbis = new PushbackInputStream(compressedData, 1);
int by = pbis.read();
if (by != 0x0A)
{
pbis.unread(by);
}
BufferedImage bi = ImageIO.read(pbis);
if (bi != null)
{
DataBuffer dBuf = bi.getData().getDataBuffer();
if (dBuf.getDataType() == DataBuffer.TYPE_BYTE)
{
// maybe some wrong/missing values have to be revised/added
ColorModel colorModel = bi.getColorModel();
if (options.getItem(COSName.COLORSPACE) == null)
{
options.setItem(COSName.COLORSPACE,
PDColorSpaceFactory.createColorSpace(null, colorModel.getColorSpace()));
}
options.setInt(COSName.BITS_PER_COMPONENT, colorModel.getPixelSize() / colorModel.getNumComponents());
options.setInt(COSName.HEIGHT, bi.getHeight());
options.setInt(COSName.WIDTH, bi.getWidth());
if (bi.getType() == BufferedImage.TYPE_3BYTE_BGR)
{
// PDFBOX-52
byte[] byteBuffer = ((DataBufferByte) dBuf).getData();
for (int i = 0; i < byteBuffer.length; i += 3)
{
//BGR
//to
//RGB
byte tmp0 = byteBuffer[i];
byteBuffer[i] = byteBuffer[i + 2];
byteBuffer[i + 2] = tmp0;
}
result.write(byteBuffer);
}
else
{
result.write(((DataBufferByte) dBuf).getData());
}
}
else
{
LOG.error("Image data buffer not of type byte but type " + dBuf.getDataType());
}
}
else
{
LOG.error("ImageIO.read() did not return any data - is JAI installed?");
}
}
/**
* {@inheritDoc}
*/
public void encode(InputStream rawData, OutputStream result, COSDictionary options, int filterIndex)
throws IOException
{
LOG.error("Warning: JPXFilter.encode is not implemented yet, skipping this stream.");
}
}