/// <summary> /// Reads a page from a TIFF image. /// by direct byte copying. It's faster but may not work /// every time /// </summary> /// <param name="s">the file source</param> /// <param name="page">the page to get. The first page is 1</param> /// <param name="direct">for single strip, CCITT images, generate the image</param> /// <returns>the Image </returns> public static Image GetTiffImage(RandomAccessFileOrArray s, int page, bool direct) { if (page < 1) { throw new InvalidOperationException("The page number must be >= 1."); } var dir = new TiffDirectory(s, page - 1); if (dir.IsTagPresent(TiffConstants.TIFFTAG_TILEWIDTH)) { throw new InvalidOperationException("Tiles are not supported."); } var 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)) { var 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; var fillOrder = 1; var h = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGELENGTH); var w = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGEWIDTH); var dpiX = 0; var dpiY = 0; float xyRatio = 0; var 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 = dpiX / (float)dpiY; } dpiX = 0; dpiY = 0; } var rowsStrip = h; if (dir.IsTagPresent(TiffConstants.TIFFTAG_ROWSPERSTRIP)) { rowsStrip = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_ROWSPERSTRIP); } if (rowsStrip <= 0 || rowsStrip > h) { rowsStrip = h; } var offset = getArrayLongShort(dir, TiffConstants.TIFFTAG_STRIPOFFSETS); var 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] }; } var reverse = false; var fillOrderField = dir.GetField(TiffConstants.TIFFTAG_FILLORDER); if (fillOrderField != null) { fillOrder = fillOrderField.GetAsInt(0); } reverse = (fillOrder == TiffConstants.FILLORDER_LSB2MSB); var paramsn = 0; if (dir.IsTagPresent(TiffConstants.TIFFTAG_PHOTOMETRIC)) { var photo = dir.GetFieldAsLong(TiffConstants.TIFFTAG_PHOTOMETRIC); if (photo == TiffConstants.PHOTOMETRIC_MINISBLACK) { paramsn |= Element.CCITT_BLACKIS1; } } var imagecomp = 0; switch (compression) { case TiffConstants.COMPRESSION_CCITTRLEW: case TiffConstants.COMPRESSION_CCITTRLE: imagecomp = Element.CCITTG3_1D; paramsn |= Element.CCITT_ENCODEDBYTEALIGN | Element.CCITT_ENDOFBLOCK; break; case TiffConstants.COMPRESSION_CCITTFAX3: imagecomp = Element.CCITTG3_1D; paramsn |= Element.CCITT_ENDOFLINE | Element.CCITT_ENDOFBLOCK; var t4OptionsField = dir.GetField(TiffConstants.TIFFTAG_GROUP3OPTIONS); if (t4OptionsField != null) { tiffT4Options = t4OptionsField.GetAsLong(0); if ((tiffT4Options & TiffConstants.GROUP3OPT_2DENCODING) != 0) { imagecomp = Element.CCITTG3_2D; } if ((tiffT4Options & TiffConstants.GROUP3OPT_FILLBITS) != 0) { paramsn |= Element.CCITT_ENCODEDBYTEALIGN; } } break; case TiffConstants.COMPRESSION_CCITTFAX4: imagecomp = Element.CCITTG4; var t6OptionsField = dir.GetField(TiffConstants.TIFFTAG_GROUP4OPTIONS); if (t6OptionsField != null) { tiffT6Options = t6OptionsField.GetAsLong(0); } break; } if (direct && rowsStrip == h) { //single strip, direct var 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 { var rowsLeft = h; var g4 = new Ccittg4Encoder(w); for (var k = 0; k < offset.Length; ++k) { var im = new byte[(int)size[k]]; s.Seek(offset[k]); s.ReadFully(im); var height = Math.Min(rowsStrip, rowsLeft); var decoder = new TiffFaxDecoder(fillOrder, w, height); var 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; } var g4Pic = g4.Close(); img = Image.GetInstance(w, h, false, Element.CCITTG4, paramsn & Element.CCITT_BLACKIS1, g4Pic); } img.SetDpi(dpiX, dpiY); img.XyRatio = xyRatio; if (dir.IsTagPresent(TiffConstants.TIFFTAG_ICCPROFILE)) { try { var fd = dir.GetField(TiffConstants.TIFFTAG_ICCPROFILE); var iccProf = IccProfile.GetInstance(fd.GetAsBytes()); if (iccProf.NumComponents == 1) { img.TagIcc = iccProf; } } catch { //empty } } img.OriginalType = Image.ORIGINAL_TIFF; if (rotation.ApproxNotEqual(0)) { img.InitialRotation = rotation; } return(img); }
protected static Image GetTiffImageColor(TiffDirectory dir, RandomAccessFileOrArray s) { var predictor = 1; TifflzwDecoder lzwDecoder = null; var 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 InvalidOperationException("The compression " + compression + " is not supported."); } var 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 InvalidOperationException("The photometric " + photometric + " is not supported."); } break; } float rotation = 0; if (dir.IsTagPresent(TiffConstants.TIFFTAG_ORIENTATION)) { var 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 InvalidOperationException("Planar images are not supported."); } if (dir.IsTagPresent(TiffConstants.TIFFTAG_EXTRASAMPLES)) { throw new InvalidOperationException("Extra samples are not supported."); } var samplePerPixel = 1; if (dir.IsTagPresent(TiffConstants.TIFFTAG_SAMPLESPERPIXEL)) // 1,3,4 { samplePerPixel = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_SAMPLESPERPIXEL); } var 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 InvalidOperationException("Bits per sample " + bitsPerSample + " is not supported."); } Image img = null; var h = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGELENGTH); var w = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_IMAGEWIDTH); var dpiX = 0; var dpiY = 0; var 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); var fillOrder = 1; var reverse = false; var fillOrderField = dir.GetField(TiffConstants.TIFFTAG_FILLORDER); if (fillOrderField != null) { fillOrder = fillOrderField.GetAsInt(0); } reverse = (fillOrder == TiffConstants.FILLORDER_LSB2MSB); var 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; } var offset = getArrayLongShort(dir, TiffConstants.TIFFTAG_STRIPOFFSETS); var 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) { var predictorField = dir.GetField(TiffConstants.TIFFTAG_PREDICTOR); if (predictorField != null) { predictor = predictorField.GetAsInt(0); if (predictor != 1 && predictor != 2) { throw new InvalidOperationException("Illegal value for Predictor in TIFF file."); } if (predictor == 2 && bitsPerSample != 8) { throw new InvalidOperationException(bitsPerSample + "-bit samples are not supported for Horizontal differencing Predictor."); } } lzwDecoder = new TifflzwDecoder(w, predictor, samplePerPixel); } var 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."); } var jpegOffset = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_JPEGIFOFFSET); var jpegLength = s.Length - jpegOffset; if (dir.IsTagPresent(TiffConstants.TIFFTAG_JPEGIFBYTECOUNT)) { jpegLength = (int)dir.GetFieldAsLong(TiffConstants.TIFFTAG_JPEGIFBYTECOUNT) + (int)size[0]; } var jpeg = new byte[Math.Min(jpegLength, s.Length - jpegOffset)]; var 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."); } var jpeg = new byte[(int)size[0]]; s.Seek(offset[0]); s.ReadFully(jpeg); img = new Jpeg(jpeg); } else { for (var k = 0; k < offset.Length; ++k) { var im = new byte[(int)size[k]]; s.Seek(offset[k]); s.ReadFully(im); var 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, Element.CCITTG4, photometric == TiffConstants.PHOTOMETRIC_MINISBLACK ? Element.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 { var fd = dir.GetField(TiffConstants.TIFFTAG_ICCPROFILE); var iccProf = IccProfile.GetInstance(fd.GetAsBytes()); if (samplePerPixel == iccProf.NumComponents) { img.TagIcc = iccProf; } } catch { //empty } } if (dir.IsTagPresent(TiffConstants.TIFFTAG_COLORMAP)) { var fd = dir.GetField(TiffConstants.TIFFTAG_COLORMAP); var rgb = fd.GetAsChars(); var palette = new byte[rgb.Length]; var gColor = rgb.Length / 3; var bColor = gColor * 2; for (var 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); } var indexed = new PdfArray(); indexed.Add(PdfName.Indexed); indexed.Add(PdfName.Devicergb); indexed.Add(new PdfNumber(gColor - 1)); indexed.Add(new PdfString(palette)); var 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.ApproxNotEqual(0)) { img.InitialRotation = rotation; } return(img); }