using System;
using System.IO;
using iTextSharp.text;
using iTextSharp.text.pdf;
using System.util.zlib;
/*
* Copyright 2003 by Paulo Soares.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or any later version.
*
* This library 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
namespace iTextSharp.text.pdf.codec {
/** Reads TIFF images
* @author Paulo Soares (psoares@consiste.pt)
*/
public class TiffImage {
/** Gets the number of pages the TIFF document has.
* @param s the file source
* @return the number of pages
*/
public static int GetNumberOfPages(RandomAccessFileOrArray s) {
return TIFFDirectory.GetNumDirectories(s);
}
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;
}
/** Reads a page from a TIFF image. Direct mode is not used.
* @param s the file source
* @param page the page to get. The first page is 1
* @return the <CODE>Image</CODE>
*/
public static Image GetTiffImage(RandomAccessFileOrArray s, int page) {
return GetTiffImage(s, page, false);
}
/** Reads a page from a TIFF image.
* @param s the file source
* @param page the page to get. The first page is 1
* @param direct for single strip, CCITT images, generate the image
* by direct byte copying. It's faster but may not work
* every time
* @return the <CODE>Image</CODE>
*/
public static Image GetTiffImage(RandomAccessFileOrArray s, int page, bool direct) {
if (page < 1)
throw new ArgumentException("The page number must be >= 1.");
TIFFDirectory dir = new TIFFDirectory(s, page - 1);
if (dir.IsTagPresent(TIFFConstants.TIFFTAG_TILEWIDTH))
throw new ArgumentException("Tiles are not supported.");
int 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:
return GetTiffImageColor(dir, s);
}
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);
}
Image img = null;
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);
int dpiX = 0;
int dpiY = 0;
float XYRatio = 0;
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);
if (resolutionUnit == TIFFConstants.RESUNIT_NONE) {
if (dpiY != 0)
XYRatio = (float)dpiX / (float)dpiY;
dpiX = 0;
dpiY = 0;
}
long tstrip = 0xFFFFFFFFL;
if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ROWSPERSTRIP))
tstrip = dir.GetFieldAsLong(TIFFConstants.TIFFTAG_ROWSPERSTRIP);
int rowsStrip = (int)Math.Min(h, tstrip);
long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
long[] size = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
if ((size == null || (size.Length == 1 && size[0] == 0)) && h == rowsStrip) { // some TIFF producers are really lousy, so...
size = new long[]{s.Length - (int)offset[0]};
}
bool reverse = false;
TIFFField fillOrderField = dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);
if (fillOrderField != null)
fillOrder = fillOrderField.GetAsInt(0);
reverse = (fillOrder == TIFFConstants.FILLORDER_LSB2MSB);
int paramsn = 0;
if (dir.IsTagPresent(TIFFConstants.TIFFTAG_PHOTOMETRIC)) {
long photo = dir.GetFieldAsLong(TIFFConstants.TIFFTAG_PHOTOMETRIC);
if (photo == TIFFConstants.PHOTOMETRIC_MINISBLACK)
paramsn |= Image.CCITT_BLACKIS1;
}
int imagecomp = 0;
switch (compression) {
case TIFFConstants.COMPRESSION_CCITTRLEW:
case TIFFConstants.COMPRESSION_CCITTRLE:
imagecomp = Image.CCITTG3_1D;
paramsn |= Image.CCITT_ENCODEDBYTEALIGN | Image.CCITT_ENDOFBLOCK;
break;
case TIFFConstants.COMPRESSION_CCITTFAX3:
imagecomp = Image.CCITTG3_1D;
paramsn |= Image.CCITT_ENDOFLINE | Image.CCITT_ENDOFBLOCK;
TIFFField t4OptionsField = dir.GetField(TIFFConstants.TIFFTAG_GROUP3OPTIONS);
if (t4OptionsField != null) {
tiffT4Options = t4OptionsField.GetAsLong(0);
if ((tiffT4Options & TIFFConstants.GROUP3OPT_2DENCODING) != 0)
imagecomp = Image.CCITTG3_2D;
if ((tiffT4Options & TIFFConstants.GROUP3OPT_FILLBITS) != 0)
paramsn |= Image.CCITT_ENCODEDBYTEALIGN;
}
break;
case TIFFConstants.COMPRESSION_CCITTFAX4:
imagecomp = Image.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);
img = Image.GetInstance(w, h, false, imagecomp, paramsn, im);
img.Inverted = 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);
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 (Exception e) {
// let's flip the fill bits and try again...
tiffT4Options ^= TIFFConstants.GROUP3OPT_FILLBITS;
try {
decoder.Decode2D(outBuf, im, 0, height, tiffT4Options);
}
catch {
throw e;
}
}
g4.Fax4Encode(outBuf, height);
break;
case TIFFConstants.COMPRESSION_CCITTFAX4:
decoder.DecodeT6(outBuf, im, 0, height, tiffT6Options);
g4.Fax4Encode(outBuf, height);
break;
}
rowsLeft -= rowsStrip;
}
byte[] g4pic = g4.Close();
img = Image.GetInstance(w, h, false, Image.CCITTG4, paramsn & Image.CCITT_BLACKIS1, g4pic);
}
img.SetDpi(dpiX, dpiY);
img.XYRatio = XYRatio;
if (dir.IsTagPresent(TIFFConstants.TIFFTAG_ICCPROFILE)) {
try {
TIFFField fd = dir.GetField(TIFFConstants.TIFFTAG_ICCPROFILE);
ICC_Profile icc_prof = ICC_Profile.GetInstance(fd.GetAsBytes());
if (icc_prof.NumComponents == 1)
img.TagICC = icc_prof;
}
catch {
//empty
}
}
img.OriginalType = Image.ORIGINAL_TIFF;
if (rotation != 0)
img.InitialRotation = rotation;
return img;
}
protected static Image GetTiffImageColor(TIFFDirectory dir, RandomAccessFileOrArray s) {
int predictor = 1;
TIFFLZWDecoder lzwDecoder = null;
int compression = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_COMPRESSION);
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 ArgumentException("The compression " + compression + " is not supported.");
}
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 ArgumentException("The photometric " + photometric + " is not supported.");
break;
}
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 ArgumentException("Planar images are not supported.");
if (dir.IsTagPresent(TIFFConstants.TIFFTAG_EXTRASAMPLES))
throw new ArgumentException("Extra samples are not supported.");
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 ArgumentException("Bits per sample " + bitsPerSample + " is not supported.");
}
Image img = null;
int h = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGELENGTH);
int w = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_IMAGEWIDTH);
int dpiX = 0;
int dpiY = 0;
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;
bool reverse = false;
TIFFField fillOrderField = dir.GetField(TIFFConstants.TIFFTAG_FILLORDER);
if (fillOrderField != null)
fillOrder = fillOrderField.GetAsInt(0);
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);
long[] offset = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPOFFSETS);
long[] size = GetArrayLongShort(dir, TIFFConstants.TIFFTAG_STRIPBYTECOUNTS);
if ((size == null || (size.Length == 1 && size[0] == 0)) && h == rowsStrip) { // some TIFF producers are really lousy, so...
size = new long[]{s.Length - (int)offset[0]};
}
if (compression == TIFFConstants.COMPRESSION_LZW) {
TIFFField predictorField = dir.GetField(TIFFConstants.TIFFTAG_PREDICTOR);
if (predictorField != null) {
predictor = predictorField.GetAsInt(0);
if (predictor != 1 && predictor != 2) {
throw new Exception("Illegal value for Predictor in TIFF file.");
}
if (predictor == 2 && bitsPerSample != 8) {
throw new Exception(bitsPerSample + "-bit samples are not supported for Horizontal differencing Predictor.");
}
}
lzwDecoder = new TIFFLZWDecoder(w, predictor,
samplePerPixel);
}
int rowsLeft = h;
MemoryStream stream = null;
ZDeflaterOutputStream zip = null;
CCITTG4Encoder g4 = null;
if (bitsPerSample == 1 && samplePerPixel == 1) {
g4 = new CCITTG4Encoder(w);
}
else {
stream = new MemoryStream();
if (compression != TIFFConstants.COMPRESSION_OJPEG && compression != TIFFConstants.COMPRESSION_JPEG)
zip = new ZDeflaterOutputStream(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("Missing tag(s) for OJPEG compression.");
}
int jpegOffset = (int)dir.GetFieldAsLong(TIFFConstants.TIFFTAG_JPEGIFOFFSET);
int jpegLength = 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, s.Length - jpegOffset)];
int posFilePointer = s.FilePointer;
posFilePointer += jpegOffset;
s.Seek(posFilePointer);
s.ReadFully(jpeg);
img = new Jpeg(jpeg);
}
else if (compression == TIFFConstants.COMPRESSION_JPEG) {
if (size.Length > 1)
throw new IOException("Compression JPEG is only supported with a single strip. This image has " + size.Length + " strips.");
byte[] jpeg = new byte[(int)size[0]];
s.Seek(offset[0]);
s.ReadFully(jpeg);
img = new Jpeg(jpeg);
}
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:
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));
}
}
}
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