iText io.jar Source Code

io.jar is a component in iText Java library to provide input/output functionalities. iText Java library allows you to generate and manage PDF documents.

The Source Code files are provided together with the JAR file in the binary packge like iText7-Core-7.1.4.zip. You can download it at iText 7 Core Download site.

You can compile it to generate your JAR file, using io.pom as the build configuration file.

The source code of io-7.1.4.jar is provided below:

✍: FYIcenter.com

com/itextpdf/io/image/TiffImageHelper.java

/*

    This file is part of the iText (R) project.
    Copyright (c) 1998-2018 iText Group NV
    Authors: Bruno Lowagie, 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: sales@itextpdf.com
 */
package com.itextpdf.io.image;

import com.itextpdf.io.IOException;
import com.itextpdf.io.codec.CCITTG4Encoder;
import com.itextpdf.io.codec.TIFFConstants;
import com.itextpdf.io.codec.TIFFDirectory;
import com.itextpdf.io.codec.TIFFFaxDecoder;
import com.itextpdf.io.codec.TIFFField;
import com.itextpdf.io.codec.TIFFLZWDecoder;
import com.itextpdf.io.colors.IccProfile;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.io.source.ByteArrayOutputStream;
import com.itextpdf.io.source.DeflaterOutputStream;
import com.itextpdf.io.source.RandomAccessFileOrArray;
import com.itextpdf.io.source.IRandomAccessSource;
import com.itextpdf.io.source.RandomAccessSourceFactory;
import com.itextpdf.io.util.FilterUtil;

import java.util.HashMap;
import java.util.Map;

class TiffImageHelper {

    private static class TiffParameters {
        TiffParameters(TiffImageData image) {
            this.image = image;
        }
        TiffImageData image;
        //ByteArrayOutputStream stream;
        boolean jpegProcessing;
        Map<String, Object> additional;
    }

    /**
     * Processes the ImageData as a TIFF image.
     * @param image image to process.
     */
    public static void processImage(ImageData image) {
        if (image.getOriginalType() != ImageType.TIFF)
            throw new IllegalArgumentException("TIFF image expected");
        try {
            IRandomAccessSource ras;
            if (image.getData() == null) {
                image.loadData();
            }
            ras = new RandomAccessSourceFactory().createSource(image.getData());
            RandomAccessFileOrArray raf = new RandomAccessFileOrArray(ras);
            TiffParameters tiff = new TiffParameters((TiffImageData)image);
            processTiffImage(raf, tiff);
            raf.close();

            if (!tiff.jpegProcessing) {
                RawImageHelper.updateImageAttributes(tiff.image, tiff.additional);
            }
        } catch (java.io.IOException e) {
            throw new IOException(IOException.TiffImageException, e);
        }
    }

    private static void processTiffImage(RandomAccessFileOrArray s, TiffParameters tiff) {
        boolean recoverFromImageError = tiff.image.isRecoverFromImageError();
        int page = tiff.image.getPage();
        boolean direct = tiff.image.isDirect();
        if (page < 1)
            throw new IOException(IOException.PageNumberMustBeGtEq1);
        try {
            TIFFDirectory dir = new TIFFDirectory(s, page - 1);
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
                throw new IOException(IOException.TilesAreNotSupported);
            int compression = TIFFConstants.COMPRESSION_NONE;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_COMPRESSION)) {
                compression = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
            }
            switch (compression) {
                case TIFFConstants.COMPRESSION_CCITTRLEW:
                case TIFFConstants.COMPRESSION_CCITTRLE:
                case TIFFConstants.COMPRESSION_CCITTFAX3:
                case TIFFConstants.COMPRESSION_CCITTFAX4:
                    break;
                default:
                    processTiffImageColor(dir, s, tiff);
                    return;
            }
            float rotation = 0;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
                int rot = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
                if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
                    rotation = (float) Math.PI;
                else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
                    rotation = (float) (Math.PI / 2.0);
                else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
                    rotation = -(float) (Math.PI / 2.0);
            }

            long tiffT4Options = 0;
            long tiffT6Options = 0;
            int fillOrder = 1;
            int h = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
            int w = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
            float XYRatio = 0;
            int resolutionUnit = TIFFConstants.RESUNIT_INCH;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
                resolutionUnit = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
            int dpiX = getDpi(dir.getField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
            int dpiY = getDpi(dir.getField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
            if (resolutionUnit == TIFFConstants.RESUNIT_NONE) {
                if (dpiY != 0)
                    XYRatio = (float) dpiX / (float) dpiY;
                dpiX = 0;
                dpiY = 0;
            }
            int rowsStrip = h;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
                rowsStrip = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
            if (rowsStrip <= 0 || rowsStrip > h)
                rowsStrip = h;
            long[] offset = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
            long[] size = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
            if ((size == null || (size.length == 1 && (size[0] == 0 || size[0] + offset[0] > s.length()))) && h == rowsStrip) { // some TIFF producers are really lousy, so...
                size = new long[]{s.length() - (int) offset[0]};
            }
            boolean reverse = false;
            TIFFField fillOrderField = dir.getField(TIFFConstants.TIFFTAG_FILLORDER);
            if (fillOrderField != null)
                fillOrder = fillOrderField.getAsInt(0);
            reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
            int parameters = 0;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC)) {
                long photo = dir.getFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
                if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
                    parameters |= RawImageData.CCITT_BLACKIS1;
            }
            int imagecomp = 0;
            switch (compression) {
                case TIFFConstants.COMPRESSION_CCITTRLEW:
                case TIFFConstants.COMPRESSION_CCITTRLE:
                    imagecomp = RawImageData.CCITTG3_1D;
                    parameters |= RawImageData.CCITT_ENCODEDBYTEALIGN | RawImageData.CCITT_ENDOFBLOCK;
                    break;
                case TIFFConstants.COMPRESSION_CCITTFAX3:
                    imagecomp = RawImageData.CCITTG3_1D;
                    parameters |= RawImageData.CCITT_ENDOFLINE | RawImageData.CCITT_ENDOFBLOCK;
                    TIFFField t4OptionsField = dir.getField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
                    if (t4OptionsField != null) {
                        tiffT4Options = t4OptionsField.getAsLong(0);
                        if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
                            imagecomp = RawImageData.CCITTG3_2D;
                        if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
                            parameters |= RawImageData.CCITT_ENCODEDBYTEALIGN;
                    }
                    break;
                case TIFFConstants.COMPRESSION_CCITTFAX4:
                    imagecomp = RawImageData.CCITTG4;
                    TIFFField t6OptionsField = dir.getField(TIFFConstants.TIFFTAG_GROUP4OPTIONS);
                    if (t6OptionsField != null)
                        tiffT6Options = t6OptionsField.getAsLong(0);
                    break;
            }
            if (direct && rowsStrip == h) { //single strip, direct
                byte[] im = new byte[(int) size[0]];
                s.seek(offset[0]);
                s.readFully(im);
                RawImageHelper.updateRawImageParameters(tiff.image, w, h, false, imagecomp, parameters, im, null);
                tiff.image.setInverted(true);
            } else {
                int rowsLeft = h;
                CCITTG4Encoder g4 = new CCITTG4Encoder(w);
                for (int k = 0; k < offset.length; ++k) {
                    byte[] im = new byte[(int) size[k]];
                    s.seek(offset[k]);
                    s.readFully(im);
                    int height = Math.min(rowsStrip, rowsLeft);
                    TIFFFaxDecoder decoder = new TIFFFaxDecoder(fillOrder, w, height);
                    decoder.setRecoverFromImageError(recoverFromImageError);
                    byte[] outBuf = new byte[(w + 7) / 8 * height];
                    switch (compression) {
                        case TIFFConstants.COMPRESSION_CCITTRLEW:
                        case TIFFConstants.COMPRESSION_CCITTRLE:
                            decoder.decode1D(outBuf, im, 0, height);
                            g4.fax4Encode(outBuf, height);
                            break;
                        case TIFFConstants.COMPRESSION_CCITTFAX3:
                            try {
                                decoder.decode2D(outBuf, im, 0, height, tiffT4Options);
                            } catch (RuntimeException e) {
                                // let's flip the fill bits and try again...
                                tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
                                try {
                                    decoder.decode2D(outBuf, im, 0, height, tiffT4Options);
                                } catch (RuntimeException e2) {
                                    if (!recoverFromImageError)
                                        throw e;
                                    if (rowsStrip == 1)
                                        throw e;
                                    // repeat of reading the tiff directly (the if section of this if else structure)
                                    // copy pasted to avoid making a method with 10 tiff
                                    im = new byte[(int) size[0]];
                                    s.seek(offset[0]);
                                    s.readFully(im);
                                    RawImageHelper.updateRawImageParameters(tiff.image, w, h, false, imagecomp, parameters, im, null);
                                    tiff.image.setInverted(true);
                                    tiff.image.setDpi(dpiX, dpiY);
                                    tiff.image.setXYRatio(XYRatio);
                                    if (rotation != 0)
                                        tiff.image.setRotation(rotation);
                                    return;
                                }
                            }
                            g4.fax4Encode(outBuf, height);
                            break;
                        case TIFFConstants.COMPRESSION_CCITTFAX4:
                            try {
                                decoder.decodeT6(outBuf, im, 0, height, tiffT6Options);
                            } catch (IOException e) {
                                if (!recoverFromImageError) {
                                    throw e;
                                }
                            }
                            g4.fax4Encode(outBuf, height);
                            break;
                    }
                    rowsLeft -= rowsStrip;
                }
                byte[] g4pic = g4.close();
                RawImageHelper.updateRawImageParameters(tiff.image, w, h, false, RawImageData.CCITTG4,
                        parameters & RawImageData.CCITT_BLACKIS1, g4pic, null);
            }
            tiff.image.setDpi(dpiX, dpiY);
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
                try {
                    TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_ICCPROFILE);
                    IccProfile icc_prof = IccProfile.getInstance(fd.getAsBytes());
                    if (icc_prof.getNumComponents() == 1)
                        tiff.image.setProfile(icc_prof);
                } catch (RuntimeException e) {
                    //empty
                }
            }
            if (rotation != 0)
                tiff.image.setRotation(rotation);
        } catch (Exception e) {
            throw new IOException(IOException.CannotReadTiffImage);
        }
    }

    private static void processTiffImageColor(TIFFDirectory dir, RandomAccessFileOrArray s, TiffParameters tiff) {
        try {
            int compression = TIFFConstants.COMPRESSION_NONE;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_COMPRESSION)) {
                compression = (int)dir.getFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
            }
            int predictor = 1;
            TIFFLZWDecoder lzwDecoder = null;
            switch (compression) {
                case TIFFConstants.COMPRESSION_NONE:
                case TIFFConstants.COMPRESSION_LZW:
                case TIFFConstants.COMPRESSION_PACKBITS:
                case TIFFConstants.COMPRESSION_DEFLATE:
                case TIFFConstants.COMPRESSION_ADOBE_DEFLATE:
                case TIFFConstants.COMPRESSION_OJPEG:
                case TIFFConstants.COMPRESSION_JPEG:
                    break;
                default:
                    throw new IOException(IOException.Compression1IsNotSupported).setMessageParams(compression);
            }
            int photometric = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
            switch (photometric) {
                case TIFFConstants.PHOTOMETRIC_MINISWHITE:
                case TIFFConstants.PHOTOMETRIC_MINISBLACK:
                case TIFFConstants.PHOTOMETRIC_RGB:
                case TIFFConstants.PHOTOMETRIC_SEPARATED:
                case TIFFConstants.PHOTOMETRIC_PALETTE:
                    break;
                default:
                    if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG)
                        throw new IOException(IOException.Photometric1IsNotSupported).setMessageParams(photometric);
            }
            float rotation = 0;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
                int rot = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
                if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
                    rotation = (float) Math.PI;
                else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
                    rotation = (float) (Math.PI / 2.0);
                else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
                    rotation = -(float) (Math.PI / 2.0);
            }
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_PLANARCONFIG)
                    && dir.getFieldAsLong(TIFFConstants.TIFFTAG_PLANARCONFIG) == TIFFConstants.PLANARCONFIG_SEPARATE)
                throw new IOException(IOException.PlanarImagesAreNotSupported);
            int extraSamples = 0;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_EXTRASAMPLES))
                extraSamples = 1;
            int samplePerPixel = 1;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL)) // 1,3,4
                samplePerPixel = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL);
            int bitsPerSample = 1;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_BITSPERSAMPLE))
                bitsPerSample = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_BITSPERSAMPLE);
            switch (bitsPerSample) {
                case 1:
                case 2:
                case 4:
                case 8:
                    break;
                default:
                    throw new IOException(IOException.BitsPerSample1IsNotSupported).setMessageParams(bitsPerSample);
            }
            int h = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
            int w = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
            int dpiX;
            int dpiY;
            int resolutionUnit = TIFFConstants.RESUNIT_INCH;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
                resolutionUnit = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
            dpiX = getDpi(dir.getField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
            dpiY = getDpi(dir.getField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
            int fillOrder = 1;
            TIFFField fillOrderField = dir.getField(TIFFConstants.TIFFTAG_FILLORDER);
            if (fillOrderField != null)
                fillOrder = fillOrderField.getAsInt(0);
            boolean reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
            int rowsStrip = h;
            if (dir.isTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP)) //another hack for broken tiffs
                rowsStrip = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
            if (rowsStrip <= 0 || rowsStrip > h)
                rowsStrip = h;
            long[] offset = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
            long[] size = getArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
            if ((size == null || (size.length == 1 && (size[0] == 0 || size[0] + offset[0] > s.length()))) && h == rowsStrip) { // some TIFF producers are really lousy, so...
                size = new long[]{s.length() - (int) offset[0]};
            }
            if (compression == TIFFConstants.COMPRESSION_LZW || compression == TIFFConstants.COMPRESSION_DEFLATE || compression == TIFFConstants.COMPRESSION_ADOBE_DEFLATE) {
                TIFFField predictorField = dir.getField(TIFFConstants.TIFFTAG_PREDICTOR);
                if (predictorField != null) {
                    predictor = predictorField.getAsInt(0);
                    if (predictor != 1 && predictor != 2) {
                        throw new IOException(IOException.IllegalValueForPredictorInTiffFile);
                    }
                    if (predictor == 2 && bitsPerSample != 8) {
                        throw new IOException(IOException._1BitSamplesAreNotSupportedForHorizontalDifferencingPredictor).setMessageParams(bitsPerSample);
                    }
                }
            }
            if (compression == TIFFConstants.COMPRESSION_LZW) {
                lzwDecoder = new TIFFLZWDecoder(w, predictor, samplePerPixel);
            }
            int rowsLeft = h;
            ByteArrayOutputStream stream = null;
            ByteArrayOutputStream mstream = null;
            DeflaterOutputStream zip = null;
            DeflaterOutputStream mzip = null;
            if (extraSamples > 0) {
                mstream = new ByteArrayOutputStream();
                mzip = new DeflaterOutputStream(mstream);
            }

            CCITTG4Encoder g4 = null;
            if (bitsPerSample == 1 && samplePerPixel == 1 && photometric != TIFFConstants.PHOTOMETRIC_PALETTE) {
                g4 = new CCITTG4Encoder(w);
            } else {
                stream = new ByteArrayOutputStream();
                if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG)
                    zip = new DeflaterOutputStream(stream);
            }
            if (compression == TIFFConstants.COMPRESSION_OJPEG) {

                // Assume that the TIFFTAG_JPEGIFBYTECOUNT tag is optional, since it's obsolete and
                // is often missing

                if ((!dir.isTagPresent(TIFFConstants.TIFFTAG_JPEGIFOFFSET))) {
                    throw new IOException(IOException.MissingTagsForOjpegCompression);
                }
                int jpegOffset = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_JPEGIFOFFSET);
                int jpegLength = (int) s.length() - jpegOffset;

                if (dir.isTagPresent(TIFFConstants.TIFFTAG_JPEGIFBYTECOUNT)) {
                    jpegLength = (int) dir.getFieldAsLong(TIFFConstants.TIFFTAG_JPEGIFBYTECOUNT) +
                            (int) size[0];
                }

                byte[] jpeg = new byte[Math.min(jpegLength, (int) s.length() - jpegOffset)];

                int posFilePointer = (int) s.getPosition();
                posFilePointer += jpegOffset;
                s.seek(posFilePointer);
                s.readFully(jpeg);
                tiff.image.data = jpeg;
                tiff.image.setOriginalType(ImageType.JPEG);
                JpegImageHelper.processImage(tiff.image);
                tiff.jpegProcessing = true;
            } else if (compression == TIFFConstants.COMPRESSION_JPEG) {
                if (size.length > 1)
                    throw new IOException(IOException.CompressionJpegIsOnlySupportedWithASingleStripThisImageHas1Strips).setMessageParams(size.length);
                byte[] jpeg = new byte[(int) size[0]];
                s.seek(offset[0]);
                s.readFully(jpeg);
                // if quantization and/or Huffman tables are stored separately in the tiff,
                // we need to add them to the jpeg data
                TIFFField jpegtables = dir.getField(TIFFConstants.TIFFTAG_JPEGTABLES);
                if (jpegtables != null) {
                    byte[] temp = jpegtables.getAsBytes();
                    int tableoffset = 0;
                    int tablelength = temp.length;
                    // remove FFD8 from start
                    if (temp[0] == (byte) 0xFF && temp[1] == (byte) 0xD8) {
                        tableoffset = 2;
                        tablelength -= 2;
                    }
                    // remove FFD9 from end
                    if (temp[temp.length - 2] == (byte) 0xFF && temp[temp.length - 1] == (byte) 0xD9)
                        tablelength -= 2;
                    byte[] tables = new byte[tablelength];
                    System.arraycopy(temp, tableoffset, tables, 0, tablelength);
                    // TODO insert after JFIF header, instead of at the start
                    byte[] jpegwithtables = new byte[jpeg.length + tables.length];
                    System.arraycopy(jpeg, 0, jpegwithtables, 0, 2);
                    System.arraycopy(tables, 0, jpegwithtables, 2, tables.length);
                    System.arraycopy(jpeg, 2, jpegwithtables, tables.length + 2, jpeg.length - 2);
                    jpeg = jpegwithtables;
                }
                tiff.image.data = jpeg;
                tiff.image.setOriginalType(ImageType.JPEG);
                JpegImageHelper.processImage(tiff.image);
                tiff.jpegProcessing = true;
                if (photometric == TIFFConstants.PHOTOMETRIC_RGB) {
                    tiff.image.setColorTransform(0);
                }
            } else {
                for (int k = 0; k < offset.length; ++k) {
                    byte[] im = new byte[(int) size[k]];
                    s.seek(offset[k]);
                    s.readFully(im);
                    int height = Math.min(rowsStrip, rowsLeft);
                    byte[] outBuf = null;
                    if (compression != TIFFConstants.COMPRESSION_NONE)
                        outBuf = new byte[(w * bitsPerSample * samplePerPixel + 7) / 8 * height];
                    if (reverse)
                        TIFFFaxDecoder.reverseBits(im);
                    switch (compression) {
                        case TIFFConstants.COMPRESSION_DEFLATE:
                        case TIFFConstants.COMPRESSION_ADOBE_DEFLATE:
                            FilterUtil.inflateData(im, outBuf);
                            applyPredictor(outBuf, predictor, w, height, samplePerPixel);
                            break;
                        case TIFFConstants.COMPRESSION_NONE:
                            outBuf = im;
                            break;
                        case TIFFConstants.COMPRESSION_PACKBITS:
                            decodePackbits(im, outBuf);
                            break;
                        case TIFFConstants.COMPRESSION_LZW:
                            lzwDecoder.decode(im, outBuf, height);
                            break;
                    }
                    if (bitsPerSample == 1 && samplePerPixel == 1 && photometric != TIFFConstants.PHOTOMETRIC_PALETTE) {
                        g4.fax4Encode(outBuf, height);
                    } else {
                        if (extraSamples > 0)
                            processExtraSamples(zip, mzip, outBuf, samplePerPixel, bitsPerSample, w, height);
                        else
                            zip.write(outBuf);
                    }
                    rowsLeft -= rowsStrip;
                }
                if (bitsPerSample == 1 && samplePerPixel == 1 && photometric != TIFFConstants.PHOTOMETRIC_PALETTE) {
                    RawImageHelper.updateRawImageParameters(tiff.image, w, h, false, RawImageData.CCITTG4,
                            photometric == TIFFConstants.PHOTOMETRIC_MINISBLACK ? RawImageData.CCITT_BLACKIS1 : 0, g4.close(), null);
                } else {
                    zip.close();
                    RawImageHelper.updateRawImageParameters(tiff.image, w, h, samplePerPixel - extraSamples, bitsPerSample, stream.toByteArray());
                    tiff.image.setDeflated(true);
                }
            }
            tiff.image.setDpi(dpiX, dpiY);
            if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG) {
                if (dir.isTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
                    try {
                        TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_ICCPROFILE);
                        IccProfile icc_prof = IccProfile.getInstance(fd.getAsBytes());
                        if (samplePerPixel - extraSamples == icc_prof.getNumComponents()) {
                            tiff.image.setProfile(icc_prof);
                        }
                    } catch (RuntimeException e) {
                        //empty
                    }
                }
                if (dir.isTagPresent(TIFFConstants.TIFFTAG_COLORMAP)) {
                    TIFFField fd = dir.getField(TIFFConstants.TIFFTAG_COLORMAP);
                    char[] rgb = fd.getAsChars();
                    byte[] palette = new byte[rgb.length];
                    int gColor = rgb.length / 3;
                    int bColor = gColor * 2;
                    for (int k = 0; k < gColor; ++k) {
                        //there is no sense in >>> for unsigned char
                        palette[k * 3] = (byte) (rgb[k] >> 8);
                        palette[k * 3 + 1] = (byte) (rgb[k + gColor] >> 8);
                        palette[k * 3 + 2] = (byte) (rgb[k + bColor] >> 8);
                    }
                    // Colormap components are supposed to go from 0 to 655535 but,
                    // as usually, some tiff producers just put values from 0 to 255.
                    // Let's check for these broken tiffs.
                    boolean colormapBroken = true;
                    for (int k = 0; k < palette.length; ++k) {
                        if (palette[k] != 0) {
                            colormapBroken = false;
                            break;
                        }
                    }
                    if (colormapBroken) {
                        for (int k = 0; k < gColor; ++k) {
                            palette[k * 3] = (byte) rgb[k];
                            palette[k * 3 + 1] = (byte) rgb[k + gColor];
                            palette[k * 3 + 2] = (byte) rgb[k + bColor];
                        }
                    }
                    Object[] indexed = new Object[4];
                    indexed[0] = "/Indexed";
                    indexed[1] = "/DeviceRGB";
                    indexed[2] = gColor - 1;
                    indexed[3] = PdfEncodings.convertToString(palette, null);
                    tiff.additional = new HashMap<>();
                    tiff.additional.put("ColorSpace", indexed);
                }
            }
            if (photometric == TIFFConstants.PHOTOMETRIC_MINISWHITE)
                tiff.image.setInverted(true);
            if (rotation != 0)
                tiff.image.setRotation(rotation);
            if (extraSamples > 0) {
                mzip.close();
                RawImageData mimg = (RawImageData) ImageDataFactory.createRawImage(null);
                RawImageHelper.updateRawImageParameters(mimg, w, h, 1, bitsPerSample, mstream.toByteArray());
                mimg.makeMask();
                mimg.setDeflated(true);
                tiff.image.setImageMask(mimg);
            }
        } catch (Exception e) {
            throw new IOException(IOException.CannotGetTiffImageColor);
        }
    }

    private static int getDpi(TIFFField fd, int resolutionUnit) {
        if (fd == null)
            return 0;
        long[] res = fd.getAsRational(0);
        float frac = (float) res[0] / (float) res[1];
        int dpi = 0;
        switch (resolutionUnit) {
            case TIFFConstants.RESUNIT_INCH:
            case TIFFConstants.RESUNIT_NONE:
                dpi = (int) (frac + 0.5);
                break;
            case TIFFConstants.RESUNIT_CENTIMETER:
                dpi = (int) (frac * 2.54 + 0.5);
                break;
        }
        return dpi;
    }

    private static void processExtraSamples(DeflaterOutputStream zip, DeflaterOutputStream mzip,
                              byte[] outBuf, int samplePerPixel, int bitsPerSample, int width, int height) throws java.io.IOException {
        if (bitsPerSample == 8) {
            byte[] mask = new byte[width * height];
            int mptr = 0;
            int optr = 0;
            int total = width * height * samplePerPixel;
            for (int k = 0; k < total; k += samplePerPixel) {
                for (int s = 0; s < samplePerPixel - 1; ++s) {
                    outBuf[optr++] = outBuf[k + s];
                }
                mask[mptr++] = outBuf[k + samplePerPixel - 1];
            }
            zip.write(outBuf, 0, optr);
            mzip.write(mask, 0, mptr);
        } else
            throw new IOException(IOException.ExtraSamplesAreNotSupported);
    }

    private static long[] getArrayLongShort(TIFFDirectory dir, int tag) {
        TIFFField field = dir.getField(tag);
        if (field == null)
            return null;
        long offset[];
        if (field.getType() == TIFFField.TIFF_LONG)
            offset = field.getAsLongs();
        else { // must be short
            char[] temp = field.getAsChars();
            offset = new long[temp.length];
            for (int k = 0; k < temp.length; ++k)
                offset[k] = temp[k];
        }
        return offset;
    }

    // Uncompress packbits compressed image data.
    private static void decodePackbits(byte[] data, byte[] dst) {
        int srcCount = 0, dstCount = 0;
        byte repeat, b;
        try {
            while (dstCount < dst.length) {
                b = data[srcCount++];
                // In Java b <= 127 is always true and the same is for .NET and b >= 0 expression,
                // checking both for the sake of consistency.
                if (b >= 0 && b <= 127) {
                    // literal run packet
                    for (int i = 0; i < (b + 1); i++) {
                        dst[dstCount++] = data[srcCount++];
                    }
                // It seems that in Java and .NET (b & 0x80) != 0 would always be true here, however still checking it
                // to be more explicit.
                } else if ((b & 0x80) != 0 && b != (byte) 0x80) {
                    // 2 byte encoded run packet
                    repeat = data[srcCount++];
                    // (~b & 0xff) + 2 is getting -b + 1 via bitwise operations,
                    // treating b as signed byte. This approach works both for Java and .NET.
                    // This is because `~x == (-x) - 1` for signed number values.
                    for (int i = 0; i < (~b & 0xff) + 2; i++) {
                        dst[dstCount++] = repeat;
                    }
                } else {
                    // no-op packet. Do nothing
                    srcCount++;
                }
            }
        } catch (Exception e) {
            // do nothing
        }
    }

    private static void applyPredictor(byte[] uncompData, int predictor, int w, int h, int samplesPerPixel) {
        if (predictor != 2)
            return;
        int count;
        for (int j = 0; j < h; j++) {
            count = samplesPerPixel * (j * w + 1);
            for (int i = samplesPerPixel; i < w * samplesPerPixel; i++) {
                uncompData[count] += uncompData[count - samplesPerPixel];
                count++;
            }
        }
    }
}

com/itextpdf/io/image/TiffImageHelper.java

 

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⇑⇑ iText for PDF Generation

2018-04-09, 55786👍, 5💬