547 lines
26 KiB
C#
547 lines
26 KiB
C#
using System;
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using System.IO;
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using iTextSharp.text;
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using iTextSharp.text.pdf;
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using System.util.zlib;
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/*
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* Copyright 2003 by Paulo Soares.
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*
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* The contents of this file are subject to the Mozilla Public License Version 1.1
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* (the "License"); you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the License.
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*
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* The Original Code is 'iText, a free JAVA-PDF library'.
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*
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* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
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* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
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* All Rights Reserved.
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* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
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* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
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*
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* Contributor(s): all the names of the contributors are added in the source code
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* where applicable.
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*
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* Alternatively, the contents of this file may be used under the terms of the
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* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
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* provisions of LGPL are applicable instead of those above. If you wish to
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* allow use of your version of this file only under the terms of the LGPL
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* License and not to allow others to use your version of this file under
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* the MPL, indicate your decision by deleting the provisions above and
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* replace them with the notice and other provisions required by the LGPL.
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* If you do not delete the provisions above, a recipient may use your version
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* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
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*
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* This library is free software; you can redistribute it and/or modify it
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* under the terms of the MPL as stated above or under the terms of the GNU
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* Library General Public License as published by the Free Software Foundation;
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* either version 2 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
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* details.
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*
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* If you didn't download this code from the following link, you should check if
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* you aren't using an obsolete version:
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* http://www.lowagie.com/iText/
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*/
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namespace iTextSharp.text.pdf.codec {
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/** Reads TIFF images
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* @author Paulo Soares (psoares@consiste.pt)
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*/
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public class TiffImage {
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/** Gets the number of pages the TIFF document has.
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* @param s the file source
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* @return the number of pages
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*/
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public static int GetNumberOfPages(RandomAccessFileOrArray s) {
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return TIFFDirectory.GetNumDirectories(s);
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}
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static int GetDpi(TIFFField fd, int resolutionUnit) {
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if (fd == null)
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return 0;
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long[] res = fd.GetAsRational(0);
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float frac = (float)res[0] / (float)res[1];
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int dpi = 0;
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switch (resolutionUnit) {
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case TIFFConstants.RESUNIT_INCH:
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case TIFFConstants.RESUNIT_NONE:
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dpi = (int)(frac + 0.5);
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break;
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case TIFFConstants.RESUNIT_CENTIMETER:
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dpi = (int)(frac * 2.54 + 0.5);
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break;
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}
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return dpi;
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}
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/** Reads a page from a TIFF image. Direct mode is not used.
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* @param s the file source
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* @param page the page to get. The first page is 1
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* @return the <CODE>Image</CODE>
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*/
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public static Image GetTiffImage(RandomAccessFileOrArray s, int page) {
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return GetTiffImage(s, page, false);
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}
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/** Reads a page from a TIFF image.
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* @param s the file source
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* @param page the page to get. The first page is 1
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* @param direct for single strip, CCITT images, generate the image
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* by direct byte copying. It's faster but may not work
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* every time
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* @return the <CODE>Image</CODE>
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*/
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public static Image GetTiffImage(RandomAccessFileOrArray s, int page, bool direct) {
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if (page < 1)
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throw new ArgumentException("The page number must be >= 1.");
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TIFFDirectory dir = new TIFFDirectory(s, page - 1);
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
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throw new ArgumentException("Tiles are not supported.");
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int compression = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
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switch (compression) {
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case TIFFConstants.COMPRESSION_CCITTRLEW:
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case TIFFConstants.COMPRESSION_CCITTRLE:
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case TIFFConstants.COMPRESSION_CCITTFAX3:
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case TIFFConstants.COMPRESSION_CCITTFAX4:
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break;
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default:
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return GetTiffImageColor(dir, s);
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}
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float rotation = 0;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
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int rot = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
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if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
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rotation = (float)Math.PI;
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else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
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rotation = (float)(Math.PI / 2.0);
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else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
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rotation = -(float)(Math.PI / 2.0);
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}
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Image img = null;
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long tiffT4Options = 0;
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long tiffT6Options = 0;
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int fillOrder = 1;
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int h = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
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int w = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
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int dpiX = 0;
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int dpiY = 0;
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float XYRatio = 0;
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int resolutionUnit = TIFFConstants.RESUNIT_INCH;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
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resolutionUnit = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
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dpiX = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
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dpiY = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
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if (resolutionUnit == TIFFConstants.RESUNIT_NONE) {
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if (dpiY != 0)
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XYRatio = (float)dpiX / (float)dpiY;
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dpiX = 0;
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dpiY = 0;
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}
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int rowsStrip = h;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
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rowsStrip = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
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if (rowsStrip <= 0 || rowsStrip > h)
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rowsStrip = h;
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long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
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long[] size = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
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if ((size == null || (size.Length == 1 && (size[0] == 0 || size[0] + offset[0] > s.Length))) && h == rowsStrip) { // some TIFF producers are really lousy, so...
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size = new long[]{s.Length - (int)offset[0]};
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}
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bool reverse = false;
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TIFFField fillOrderField = dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);
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if (fillOrderField != null)
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fillOrder = fillOrderField.GetAsInt(0);
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reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
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int paramsn = 0;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC)) {
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long photo = dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
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if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
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paramsn |= Image.CCITT_BLACKIS1;
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}
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int imagecomp = 0;
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switch (compression) {
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case TIFFConstants.COMPRESSION_CCITTRLEW:
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case TIFFConstants.COMPRESSION_CCITTRLE:
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imagecomp = Image.CCITTG3_1D;
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paramsn |= Image.CCITT_ENCODEDBYTEALIGN | Image.CCITT_ENDOFBLOCK;
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break;
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case TIFFConstants.COMPRESSION_CCITTFAX3:
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imagecomp = Image.CCITTG3_1D;
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paramsn |= Image.CCITT_ENDOFLINE | Image.CCITT_ENDOFBLOCK;
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TIFFField t4OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
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if (t4OptionsField != null) {
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tiffT4Options = t4OptionsField.GetAsLong(0);
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if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
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imagecomp = Image.CCITTG3_2D;
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if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
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paramsn |= Image.CCITT_ENCODEDBYTEALIGN;
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}
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break;
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case TIFFConstants.COMPRESSION_CCITTFAX4:
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imagecomp = Image.CCITTG4;
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TIFFField t6OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP4OPTIONS);
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if (t6OptionsField != null)
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tiffT6Options = t6OptionsField.GetAsLong(0);
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break;
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}
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if (direct && rowsStrip == h) { //single strip, direct
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byte[] im = new byte[(int)size[0]];
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s.Seek(offset[0]);
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s.ReadFully(im);
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img = Image.GetInstance(w, h, false, imagecomp, paramsn, im);
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img.Inverted = true;
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}
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else {
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int rowsLeft = h;
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CCITTG4Encoder g4 = new CCITTG4Encoder(w);
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for (int k = 0; k < offset.Length; ++k) {
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byte[] im = new byte[(int)size[k]];
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s.Seek(offset[k]);
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s.ReadFully(im);
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int height = Math.Min(rowsStrip, rowsLeft);
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TIFFFaxDecoder decoder = new TIFFFaxDecoder(fillOrder, w, height);
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byte[] outBuf = new byte[(w + 7) / 8 * height];
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switch (compression) {
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case TIFFConstants.COMPRESSION_CCITTRLEW:
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case TIFFConstants.COMPRESSION_CCITTRLE:
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decoder.Decode1D(outBuf, im, 0, height);
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g4.Fax4Encode(outBuf, height);
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break;
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case TIFFConstants.COMPRESSION_CCITTFAX3:
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try {
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decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
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}
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catch (Exception e) {
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// let's flip the fill bits and try again...
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tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
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try {
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decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
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}
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catch {
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throw e;
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}
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}
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g4.Fax4Encode(outBuf, height);
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break;
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case TIFFConstants.COMPRESSION_CCITTFAX4:
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decoder.DecodeT6(outBuf, im, 0, height, tiffT6Options);
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g4.Fax4Encode(outBuf, height);
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break;
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}
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rowsLeft -= rowsStrip;
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}
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byte[] g4pic = g4.Close();
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img = Image.GetInstance(w, h, false, Image.CCITTG4, paramsn & Image.CCITT_BLACKIS1, g4pic);
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}
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img.SetDpi(dpiX, dpiY);
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img.XYRatio = XYRatio;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
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try {
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TIFFField fd = dir.GetField(TIFFConstants.TIFFTAG_ICCPROFILE);
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ICC_Profile icc_prof = ICC_Profile.GetInstance(fd.GetAsBytes());
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if (icc_prof.NumComponents == 1)
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img.TagICC = icc_prof;
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}
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catch {
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//empty
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}
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}
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img.OriginalType = Image.ORIGINAL_TIFF;
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if (rotation != 0)
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img.InitialRotation = rotation;
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return img;
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}
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protected static Image GetTiffImageColor(TIFFDirectory dir, RandomAccessFileOrArray s) {
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int predictor = 1;
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TIFFLZWDecoder lzwDecoder = null;
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int compression = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
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switch (compression) {
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case TIFFConstants.COMPRESSION_NONE:
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case TIFFConstants.COMPRESSION_LZW:
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case TIFFConstants.COMPRESSION_PACKBITS:
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case TIFFConstants.COMPRESSION_DEFLATE:
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case TIFFConstants.COMPRESSION_ADOBE_DEFLATE:
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case TIFFConstants.COMPRESSION_OJPEG:
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case TIFFConstants.COMPRESSION_JPEG:
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break;
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default:
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throw new ArgumentException("The compression " + compression + " is not supported.");
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}
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int photometric = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
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switch (photometric) {
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case TIFFConstants.PHOTOMETRIC_MINISWHITE:
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case TIFFConstants.PHOTOMETRIC_MINISBLACK:
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case TIFFConstants.PHOTOMETRIC_RGB:
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case TIFFConstants.PHOTOMETRIC_SEPARATED:
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case TIFFConstants.PHOTOMETRIC_PALETTE:
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break;
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default:
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if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG)
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throw new ArgumentException("The photometric " + photometric + " is not supported.");
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break;
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}
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float rotation = 0;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ORIENTATION)) {
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int rot = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ORIENTATION);
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if (rot == TIFFConstants.ORIENTATION_BOTRIGHT || rot == TIFFConstants.ORIENTATION_BOTLEFT)
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rotation = (float)Math.PI;
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else if (rot == TIFFConstants.ORIENTATION_LEFTTOP || rot == TIFFConstants.ORIENTATION_LEFTBOT)
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rotation = (float)(Math.PI / 2.0);
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else if (rot == TIFFConstants.ORIENTATION_RIGHTTOP || rot == TIFFConstants.ORIENTATION_RIGHTBOT)
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rotation = -(float)(Math.PI / 2.0);
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}
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_PLANARCONFIG)
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&& dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PLANARCONFIG) == TIFFConstants.PLANARCONFIG_SEPARATE)
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throw new ArgumentException("Planar images are not supported.");
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_EXTRASAMPLES))
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throw new ArgumentException("Extra samples are not supported.");
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int samplePerPixel = 1;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL)) // 1,3,4
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samplePerPixel = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_SAMPLESPERPIXEL);
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int bitsPerSample = 1;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_BITSPERSAMPLE))
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bitsPerSample = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_BITSPERSAMPLE);
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switch (bitsPerSample) {
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case 1:
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case 2:
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case 4:
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case 8:
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break;
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default:
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throw new ArgumentException("Bits per sample " + bitsPerSample + " is not supported.");
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}
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Image img = null;
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int h = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
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int w = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
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int dpiX = 0;
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int dpiY = 0;
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int resolutionUnit = TIFFConstants.RESUNIT_INCH;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_RESOLUTIONUNIT))
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resolutionUnit = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_RESOLUTIONUNIT);
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dpiX = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_XRESOLUTION), resolutionUnit);
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dpiY = GetDpi(dir.GetField(TIFFConstants.TIFFTAG_YRESOLUTION), resolutionUnit);
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int fillOrder = 1;
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bool reverse = false;
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TIFFField fillOrderField = dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);
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if (fillOrderField != null)
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fillOrder = fillOrderField.GetAsInt(0);
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reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
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int rowsStrip = h;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP)) //another hack for broken tiffs
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rowsStrip = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
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if (rowsStrip <= 0 || rowsStrip > h)
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rowsStrip = h;
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long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
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long[] size = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
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if ((size == null || (size.Length == 1 && (size[0] == 0 || size[0] + offset[0] > s.Length))) && h == rowsStrip) { // some TIFF producers are really lousy, so...
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size = new long[]{s.Length - (int)offset[0]};
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}
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if (compression == TIFFConstants.COMPRESSION_LZW) {
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TIFFField predictorField = dir.GetField(TIFFConstants.TIFFTAG_PREDICTOR);
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if (predictorField != null) {
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predictor = predictorField.GetAsInt(0);
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if (predictor != 1 && predictor != 2) {
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throw new Exception("Illegal value for Predictor in TIFF file.");
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}
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if (predictor == 2 && bitsPerSample != 8) {
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throw new Exception(bitsPerSample + "-bit samples are not supported for Horizontal differencing Predictor.");
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}
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}
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lzwDecoder = new TIFFLZWDecoder(w, predictor,
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samplePerPixel);
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}
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int rowsLeft = h;
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MemoryStream stream = null;
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ZDeflaterOutputStream zip = null;
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CCITTG4Encoder g4 = null;
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if (bitsPerSample == 1 && samplePerPixel == 1) {
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g4 = new CCITTG4Encoder(w);
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}
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else {
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stream = new MemoryStream();
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if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG)
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zip = new ZDeflaterOutputStream(stream);
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}
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if (compression == TIFFConstants.COMPRESSION_OJPEG) {
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// Assume that the TIFFTAG_JPEGIFBYTECOUNT tag is optional, since it's obsolete and
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// is often missing
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if ((!dir.IsTagPresent(TIFFConstants.TIFFTAG_JPEGIFOFFSET))) {
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throw new IOException("Missing tag(s) for OJPEG compression.");
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}
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int jpegOffset = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_JPEGIFOFFSET);
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int jpegLength = s.Length - jpegOffset;
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if (dir.IsTagPresent(TIFFConstants.TIFFTAG_JPEGIFBYTECOUNT)) {
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jpegLength = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_JPEGIFBYTECOUNT) +
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(int)size[0];
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}
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byte[] jpeg = new byte[Math.Min(jpegLength, s.Length - jpegOffset)];
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int posFilePointer = s.FilePointer;
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posFilePointer += jpegOffset;
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s.Seek(posFilePointer);
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s.ReadFully(jpeg);
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img = new Jpeg(jpeg);
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}
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else if (compression == TIFFConstants.COMPRESSION_JPEG) {
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if (size.Length > 1)
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throw new IOException("Compression JPEG is only supported with a single strip. This image has " + size.Length + " strips.");
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byte[] jpeg = new byte[(int)size[0]];
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s.Seek(offset[0]);
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s.ReadFully(jpeg);
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img = new Jpeg(jpeg);
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}
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else {
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for (int k = 0; k < offset.Length; ++k) {
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byte[] im = new byte[(int)size[k]];
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s.Seek(offset[k]);
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s.ReadFully(im);
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|
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:
|
|
Inflate(im, outBuf);
|
|
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) {
|
|
g4.Fax4Encode(outBuf, height);
|
|
}
|
|
else {
|
|
zip.Write(outBuf, 0, outBuf.Length);
|
|
}
|
|
rowsLeft -= rowsStrip;
|
|
}
|
|
if (bitsPerSample == 1 && samplePerPixel == 1) {
|
|
img = Image.GetInstance(w, h, false, Image.CCITTG4,
|
|
photometric == TIFFConstants.PHOTOMETRIC_MINISBLACK ? Image.CCITT_BLACKIS1 : 0, g4.Close());
|
|
}
|
|
else {
|
|
zip.Close();
|
|
img = Image.GetInstance(w, h, samplePerPixel, bitsPerSample, stream.ToArray());
|
|
img.Deflated = true;
|
|
}
|
|
}
|
|
img.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);
|
|
ICC_Profile icc_prof = ICC_Profile.GetInstance(fd.GetAsBytes());
|
|
if (samplePerPixel == icc_prof.NumComponents)
|
|
img.TagICC = icc_prof;
|
|
}
|
|
catch {
|
|
//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) {
|
|
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);
|
|
}
|
|
PdfArray indexed = new PdfArray();
|
|
indexed.Add(PdfName.INDEXED);
|
|
indexed.Add(PdfName.DEVICERGB);
|
|
indexed.Add(new PdfNumber(gColor - 1));
|
|
indexed.Add(new PdfString(palette));
|
|
PdfDictionary additional = new PdfDictionary();
|
|
additional.Put(PdfName.COLORSPACE, indexed);
|
|
img.Additional = additional;
|
|
}
|
|
img.OriginalType = Image.ORIGINAL_TIFF;
|
|
}
|
|
if (photometric == TIFFConstants.PHOTOMETRIC_MINISWHITE)
|
|
img.Inverted = true;
|
|
if (rotation != 0)
|
|
img.InitialRotation = rotation;
|
|
return img;
|
|
}
|
|
|
|
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.
|
|
public static void DecodePackbits(byte[] data, byte[] dst) {
|
|
int srcCount = 0, dstCount = 0;
|
|
sbyte repeat, b;
|
|
|
|
try {
|
|
while (dstCount < dst.Length) {
|
|
b = (sbyte)data[srcCount++];
|
|
if (b >= 0 && b <= 127) {
|
|
// literal run packet
|
|
for (int i=0; i<(b + 1); i++) {
|
|
dst[dstCount++] = data[srcCount++];
|
|
}
|
|
|
|
} else if (b <= -1 && b >= -127) {
|
|
// 2 byte encoded run packet
|
|
repeat = (sbyte)data[srcCount++];
|
|
for (int i=0; i<(-b + 1); i++) {
|
|
dst[dstCount++] = (byte)repeat;
|
|
}
|
|
} else {
|
|
// no-op packet. Do nothing
|
|
srcCount++;
|
|
}
|
|
}
|
|
}
|
|
catch {
|
|
}
|
|
}
|
|
|
|
public static void Inflate(byte[] deflated, byte[] inflated) {
|
|
byte[] outp = PdfReader.FlateDecode(deflated);
|
|
System.Array.Copy(outp, 0, inflated, 0, Math.Min(outp.Length, inflated.Length));
|
|
}
|
|
}
|
|
}
|