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/*
* $Id: 1e4d8beb6648dcf72fc57b71cddc87b5a17f012c $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Kevin Day, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.parser;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.imageio.ImageIO;
import com.itextpdf.text.Version;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.exceptions.UnsupportedPdfException;
import com.itextpdf.text.pdf.FilterHandlers;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfString;
import com.itextpdf.text.pdf.codec.PngWriter;
import com.itextpdf.text.pdf.codec.TIFFConstants;
import com.itextpdf.text.pdf.codec.TiffWriter;
/**
* An object that contains an image dictionary and image bytes.
* @since 5.0.2
*/
public class PdfImageObject {
/**
* Different types of data that can be stored in the bytes of a {@link PdfImageObject}
* @since 5.0.4
*/
public static enum ImageBytesType{
PNG("png"), // the stream contains png encoded data
JPG("jpg"), // the stream contains jpg encoded data
JP2("jp2"), // the stream contains jp2 encoded data
CCITT("tif"), // the stream contains ccitt encoded data
JBIG2("jbig2") // the stream contains JBIG2 encoded data
;
/**
* the recommended file extension for streams of this type
*/
private final String fileExtension;
/**
* @param fileExtension the recommended file extension for use with data of this type (for example, if the bytes were just saved to a file, what extension should the file have)
*/
private ImageBytesType(String fileExtension) {
this.fileExtension = fileExtension;
}
/**
* @return the file extension registered when this type was created
*/
public String getFileExtension() {
return fileExtension;
}
}
/**
* A filter that does nothing, but keeps track of the filter type that was used
* @since 5.0.4
*/
private static class TrackingFilter implements FilterHandlers.FilterHandler{
public PdfName lastFilterName = null;
public byte[] decode(byte[] b, PdfName filterName, PdfObject decodeParams, PdfDictionary streamDictionary) throws IOException {
lastFilterName = filterName;
return b;
}
}
/** The image dictionary. */
private PdfDictionary dictionary;
/** The decoded image bytes (after applying filters), or the raw image bytes if unable to decode */
private byte[] imageBytes;
private PdfDictionary colorSpaceDic;
private int pngColorType = -1;
private int pngBitDepth;
private int width;
private int height;
private int bpc;
private byte[] palette;
private byte[] icc;
private int stride;
/**
* Tracks the type of data that is actually stored in the streamBytes member
*/
private ImageBytesType streamContentType = null;
public String getFileType() {
return streamContentType.getFileExtension();
}
/**
* @return the type of image data that is returned by getImageBytes()
*/
public ImageBytesType getImageBytesType(){
return streamContentType;
}
/**
* Creates a PdfImage object.
* @param stream a PRStream
* @throws IOException
*/
public PdfImageObject(PRStream stream) throws IOException {
this(stream, PdfReader.getStreamBytesRaw(stream), null);
}
/**
* Creates a PdfImage object.
* @param stream a PRStream
* @param colorSpaceDic a color space dictionary
* @throws IOException
*/
public PdfImageObject(PRStream stream, PdfDictionary colorSpaceDic) throws IOException {
this(stream, PdfReader.getStreamBytesRaw(stream), colorSpaceDic);
}
/**
* Creats a PdfImage object using an explicitly provided dictionary and image bytes
* @param dictionary the dictionary for the image
* @param samples the samples
* @param colorSpaceDic a color space dictionary
* @since 5.0.3
*/
protected PdfImageObject(PdfDictionary dictionary, byte[] samples, PdfDictionary colorSpaceDic) throws IOException {
this.dictionary = dictionary;
this.colorSpaceDic = colorSpaceDic;
TrackingFilter trackingFilter = new TrackingFilter();
Map handlers = new HashMap(FilterHandlers.getDefaultFilterHandlers());
handlers.put(PdfName.JBIG2DECODE, trackingFilter);
handlers.put(PdfName.DCTDECODE, trackingFilter);
handlers.put(PdfName.JPXDECODE, trackingFilter);
imageBytes = PdfReader.decodeBytes(samples, dictionary, handlers);
if (trackingFilter.lastFilterName != null){
if (PdfName.JBIG2DECODE.equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JBIG2;
else if (PdfName.DCTDECODE.equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JPG;
else if (PdfName.JPXDECODE.equals(trackingFilter.lastFilterName))
streamContentType = ImageBytesType.JP2;
} else {
decodeImageBytes();
}
}
/**
* Returns an entry from the image dictionary.
* @param key a key
* @return the value
*/
public PdfObject get(PdfName key) {
return dictionary.get(key);
}
/**
* Returns the image dictionary.
* @return the dictionary
*/
public PdfDictionary getDictionary() {
return dictionary;
}
/**
* Sets state of this object according to the color space
* @param colorspace the colorspace to use
* @param allowIndexed whether indexed color spaces will be resolved (used for recursive call)
* @throws IOException if there is a problem with reading from the underlying stream
*/
private void findColorspace(PdfObject colorspace, boolean allowIndexed) throws IOException {
if (colorspace == null && bpc == 1){ // handle imagemasks
stride = (width*bpc + 7) / 8;
pngColorType = 0;
}
else if (PdfName.DEVICEGRAY.equals(colorspace)) {
stride = (width * bpc + 7) / 8;
pngColorType = 0;
}
else if (PdfName.DEVICERGB.equals(colorspace)) {
if (bpc == 8 || bpc == 16) {
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
}
}
else if (colorspace instanceof PdfArray) {
PdfArray ca = (PdfArray)colorspace;
PdfObject tyca = ca.getDirectObject(0);
if (PdfName.CALGRAY.equals(tyca)) {
stride = (width * bpc + 7) / 8;
pngColorType = 0;
}
else if (PdfName.CALRGB.equals(tyca)) {
if (bpc == 8 || bpc == 16) {
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
}
}
else if (PdfName.ICCBASED.equals(tyca)) {
PRStream pr = (PRStream)ca.getDirectObject(1);
int n = pr.getAsNumber(PdfName.N).intValue();
if (n == 1) {
stride = (width * bpc + 7) / 8;
pngColorType = 0;
icc = PdfReader.getStreamBytes(pr);
}
else if (n == 3) {
stride = (width * bpc * 3 + 7) / 8;
pngColorType = 2;
icc = PdfReader.getStreamBytes(pr);
}
}
else if (allowIndexed && PdfName.INDEXED.equals(tyca)) {
findColorspace(ca.getDirectObject(1), false);
if (pngColorType == 2) {
PdfObject id2 = ca.getDirectObject(3);
if (id2 instanceof PdfString) {
palette = ((PdfString)id2).getBytes();
}
else if (id2 instanceof PRStream) {
palette = PdfReader.getStreamBytes(((PRStream)id2));
}
stride = (width * bpc + 7) / 8;
pngColorType = 3;
}
}
}
}
/**
* decodes the bytes currently captured in the streamBytes and replaces it with an image representation of the bytes
* (this will either be a png or a tiff, depending on the color depth of the image)
* @throws IOException
*/
private void decodeImageBytes() throws IOException{
if (streamContentType != null)
throw new IllegalStateException(MessageLocalization.getComposedMessage("Decoding.can't.happen.on.this.type.of.stream.(.1.)", streamContentType));
pngColorType = -1;
PdfArray decode = dictionary.getAsArray(PdfName.DECODE);
width = dictionary.getAsNumber(PdfName.WIDTH).intValue();
height = dictionary.getAsNumber(PdfName.HEIGHT).intValue();
bpc = dictionary.getAsNumber(PdfName.BITSPERCOMPONENT).intValue();
pngBitDepth = bpc;
PdfObject colorspace = dictionary.getDirectObject(PdfName.COLORSPACE);
if (colorspace instanceof PdfName && colorSpaceDic != null){
PdfObject csLookup = colorSpaceDic.getDirectObject((PdfName)colorspace);
if (csLookup != null)
colorspace = csLookup;
}
palette = null;
icc = null;
stride = 0;
findColorspace(colorspace, true);
ByteArrayOutputStream ms = new ByteArrayOutputStream();
if (pngColorType < 0) {
if (bpc != 8)
throw new UnsupportedPdfException(MessageLocalization.getComposedMessage("the.color.depth.1.is.not.supported", bpc));
if (PdfName.DEVICECMYK.equals(colorspace)) {
}
else if (colorspace instanceof PdfArray) {
PdfArray ca = (PdfArray)colorspace;
PdfObject tyca = ca.getDirectObject(0);
if (!PdfName.ICCBASED.equals(tyca))
throw new UnsupportedPdfException(MessageLocalization.getComposedMessage("the.color.space.1.is.not.supported", colorspace));
PRStream pr = (PRStream)ca.getDirectObject(1);
int n = pr.getAsNumber(PdfName.N).intValue();
if (n != 4) {
throw new UnsupportedPdfException(MessageLocalization.getComposedMessage("N.value.1.is.not.supported", n));
}
icc = PdfReader.getStreamBytes(pr);
}
else
throw new UnsupportedPdfException(MessageLocalization.getComposedMessage("the.color.space.1.is.not.supported", colorspace));
stride = 4 * width;
TiffWriter wr = new TiffWriter();
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL, 4));
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_BITSPERSAMPLE, new int[]{8,8,8,8}));
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PHOTOMETRIC, TIFFConstants.PHOTOMETRIC_SEPARATED));
wr.addField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGEWIDTH, width));
wr.addField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_IMAGELENGTH, height));
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_COMPRESSION, TIFFConstants.COMPRESSION_LZW));
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_PREDICTOR, TIFFConstants.PREDICTOR_HORIZONTAL_DIFFERENCING));
wr.addField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP, height));
wr.addField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_XRESOLUTION, new int[]{300,1}));
wr.addField(new TiffWriter.FieldRational(TIFFConstants.TIFFTAG_YRESOLUTION, new int[]{300,1}));
wr.addField(new TiffWriter.FieldShort(TIFFConstants.TIFFTAG_RESOLUTIONUNIT, TIFFConstants.RESUNIT_INCH));
wr.addField(new TiffWriter.FieldAscii(TIFFConstants.TIFFTAG_SOFTWARE, Version.getInstance().getVersion()));
ByteArrayOutputStream comp = new ByteArrayOutputStream();
TiffWriter.compressLZW(comp, 2, imageBytes, height, 4, stride);
byte[] buf = comp.toByteArray();
wr.addField(new TiffWriter.FieldImage(buf));
wr.addField(new TiffWriter.FieldLong(TIFFConstants.TIFFTAG_STRIPBYTECOUNTS, buf.length));
if (icc != null)
wr.addField(new TiffWriter.FieldUndefined(TIFFConstants.TIFFTAG_ICCPROFILE, icc));
wr.writeFile(ms);
streamContentType = ImageBytesType.CCITT;
imageBytes = ms.toByteArray();
return;
} else {
PngWriter png = new PngWriter(ms);
if (decode != null){
if (pngBitDepth == 1){
// if the decode array is 1,0, then we need to invert the image
if(decode.getAsNumber(0).intValue() == 1 && decode.getAsNumber(1).intValue() == 0){
int len = imageBytes.length;
for (int t = 0; t < len; ++t) {
imageBytes[t] ^= 0xff;
}
} else {
// if the decode array is 0,1, do nothing. It's possible that the array could be 0,0 or 1,1 - but that would be silly, so we'll just ignore that case
}
} else {
// todo: add decode transformation for other depths
}
}
png.writeHeader(width, height, pngBitDepth, pngColorType);
if (icc != null)
png.writeIccProfile(icc);
if (palette != null)
png.writePalette(palette);
png.writeData(imageBytes, stride);
png.writeEnd();
streamContentType = ImageBytesType.PNG;
imageBytes = ms.toByteArray();
}
}
/**
* @return the bytes of the image (the format will be as specified in {@link PdfImageObject#getImageBytesType()}
* @throws IOException
* @since 5.0.4
*/
public byte[] getImageAsBytes() {
return imageBytes;
}
}
