/**
* Decode JBIG2 data using Java ImageIO library.
*
* <p>{@inheritDoc}
*/
public void decode(
InputStream compressedData, OutputStream result, COSDictionary options, int filterIndex)
throws IOException {
/**
* A working JBIG2 ImageIO plugin is needed to decode JBIG2 encoded streams. The following is
* known to be working. It can't be bundled with PDFBox because of an incompatible license.
* http://code.google.com/p/jbig2-imageio/
*/
Iterator<ImageReader> readers = ImageIO.getImageReadersByFormatName("JBIG2");
if (!readers.hasNext()) {
LOG.error("Can't find an ImageIO plugin to decode the JBIG2 encoded datastream.");
return;
}
ImageReader reader = readers.next();
COSDictionary decodeP = (COSDictionary) options.getDictionaryObject(COSName.DECODE_PARMS);
COSInteger bits = (COSInteger) options.getDictionaryObject(COSName.BITS_PER_COMPONENT);
COSStream st = null;
if (decodeP != null) {
st = (COSStream) decodeP.getDictionaryObject(COSName.JBIG2_GLOBALS);
}
if (st != null) {
reader.setInput(
ImageIO.createImageInputStream(
new SequenceInputStream(st.getFilteredStream(), compressedData)));
} else {
reader.setInput(ImageIO.createImageInputStream(compressedData));
}
BufferedImage bi = reader.read(0);
reader.dispose();
if (bi != null) {
// I am assuming since JBIG2 is always black and white
// depending on your renderer this might or might be needed
if (bi.getColorModel().getPixelSize() != bits.intValue()) {
if (bits.intValue() != 1) {
LOG.error("Do not know how to deal with JBIG2 with more than 1 bit");
return;
}
BufferedImage packedImage =
new BufferedImage(bi.getWidth(), bi.getHeight(), BufferedImage.TYPE_BYTE_BINARY);
Graphics graphics = packedImage.getGraphics();
graphics.drawImage(bi, 0, 0, null);
graphics.dispose();
bi = packedImage;
}
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 {
LOG.error("Something went wrong when decoding the JBIG2 encoded datastream.");
}
}
@SuppressWarnings("unchecked")
public static void main_3(String[] args) throws IOException {
PDDocument doc = PDDocument.load(iconFile);
List<PDPage> pages = doc.getDocumentCatalog().getAllPages();
List<COSObject> objects = doc.getDocument().getObjects();
for (COSObject cosObject : objects) {
COSBase cosbase = cosObject.getObject();
if (cosObject.getObject() instanceof COSStream) {
COSStream cosstream = (COSStream) cosbase;
COSBase filter = cosstream.getDictionaryObject(COSName.FILTER);
COSBase subtype = cosstream.getDictionaryObject(COSName.SUBTYPE);
if (subtype != null && subtype.equals(COSName.IMAGE)) {
System.out.println(filter);
InputStream filtered = cosstream.getFilteredStream();
// PDStream stream = new PDStream(costream);
System.out.println(Hex.encodeHex(IOUtils.toByteArray(filtered)));
}
}
}
for (PDPage pdPage : pages) {
PDResources resources = pdPage.getResources();
Map<String, PDXObject> images = resources.getXObjects();
Set<String> keys = images.keySet();
for (String key : keys) {
PDXObject image = images.get(key);
byte[] imgData = image.getPDStream().getByteArray();
System.out.println(Hex.encodeHex(imgData));
}
}
}
