C# pdf.RandomAccessFileOrArray类代码示例

        virtual public void TestConstructionForType0WithoutToUnicodeMap()
        {
            int pageNum = 2;
            PdfName fontIdName = new PdfName("TT9");

            string testFile = TestResourceUtils.GetResourceAsTempFile(TEST_RESOURCES_PATH, "type0FontWithoutToUnicodeMap.pdf");
            RandomAccessFileOrArray f = new RandomAccessFileOrArray(testFile);
            PdfReader reader = new PdfReader(f, null);

            try
            {
                PdfDictionary fontsDic = reader.GetPageN(pageNum).GetAsDict(PdfName.RESOURCES).GetAsDict(PdfName.FONT);
                PdfDictionary fontDicDirect = fontsDic.GetAsDict(fontIdName);
                PRIndirectReference fontDicIndirect = (PRIndirectReference)fontsDic.Get(fontIdName);

                Assert.AreEqual(PdfName.TYPE0, fontDicDirect.GetAsName(PdfName.SUBTYPE));
                Assert.AreEqual("/Identity-H", fontDicDirect.GetAsName(PdfName.ENCODING).ToString());
                Assert.IsNull(fontDicDirect.Get(PdfName.TOUNICODE), "This font should not have a ToUnicode map");

                new DocumentFont(fontDicIndirect); // this used to throw an NPE
            }
            finally
            {
                reader.Close();
            }
        }

        /// <summary>
        ///  Extract Image from PDF file and Store in Image Object
        /// </summary>
        /// <param name="pdfPath">Specify PDF Source Path</param>
        /// <returns>elenco dei path relativi alle immagini estratte</returns>
        public static List<string> ExtractImages(String pdfPath)
        {
            var pathTokens = pdfPath.Split(new char[] { '\\' });
            var session = pathTokens[pathTokens.Length - 2];
            var basePath = Path.GetDirectoryName(pdfPath);
            var filename = Path.GetFileNameWithoutExtension(pdfPath);

            List<string> urls = new List<string>();

               RandomAccessFileOrArray RAFObj = null;
            PdfReader PDFReaderObj = null;
            PdfObject PDFObj = null;
            PdfStream PDFStreamObj = null;

            //try
            //{
            RAFObj = new RandomAccessFileOrArray(pdfPath);//(PDFSourcePath);
            PDFReaderObj = new PdfReader(RAFObj, null);

            var info = PDFReaderObj.Info;
            var j = 0;
            for (int i = 0; i <= PDFReaderObj.XrefSize - 1; i++)
            {
                PDFObj = PDFReaderObj.GetPdfObject(i);

                if ((PDFObj != null) && PDFObj.IsStream())
                {
                    PdfDictionary pd = (PdfDictionary)PDFObj;

                    PDFStreamObj = (iTextSharp.text.pdf.PdfStream)PDFObj;
                    iTextSharp.text.pdf.PdfObject subtype = PDFStreamObj.Get(iTextSharp.text.pdf.PdfName.SUBTYPE);

                    if ((subtype != null) && subtype.ToString() == iTextSharp.text.pdf.PdfName.IMAGE.ToString())
                    {
                        filename = filename + "_" + (++j).ToString();
                        byte[] bytes = PdfReader.GetStreamBytesRaw((iTextSharp.text.pdf.PRStream)PDFStreamObj);

                        Tiff tiff = Tiff.Open(Path.Combine(basePath, filename + ".tif"), "w");
                        tiff.SetField(TiffTag.IMAGEWIDTH, UInt32.Parse(pd.Get(PdfName.WIDTH).ToString()));
                        tiff.SetField(TiffTag.IMAGELENGTH, UInt32.Parse(pd.Get(PdfName.HEIGHT).ToString()));
                        tiff.SetField(TiffTag.COMPRESSION, Compression.CCITTFAX4);
                        tiff.SetField(TiffTag.BITSPERSAMPLE, UInt32.Parse(pd.Get(PdfName.BITSPERCOMPONENT).ToString()));
                        tiff.SetField(TiffTag.SAMPLESPERPIXEL, 1);
                        tiff.WriteRawStrip(0, bytes, bytes.Length);
                        tiff.Close();

                        var bmp = tiffToBitmap(Path.Combine(basePath, filename + ".tif"));
                        if (bmp != null)
                        {
                            bmp.Save(Path.Combine(basePath, filename + ".bmp"));
                            urls.Add( session + "/" + filename + ".bmp");
                        }
                    }
                }
            }
            PDFReaderObj.Close();
            return urls;
        }

 /**
 * Gets a byte array that can be used as a /JBIG2Globals,
 * or null if not applicable to the given jbig2.
 * @param   ra  an random access file or array
 * @return  a byte array
 */
 public static byte[] GetGlobalSegment(RandomAccessFileOrArray ra ) {
     try {
         JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
         sr.Read();
         return sr.GetGlobal(true);
     } catch {
         return null;
     }
 }

 virtual public void TestSeek()
 {
     RandomAccessFileOrArray rafoa = new RandomAccessFileOrArray(new RandomAccessSourceFactory().CreateSource(data));
     rafoa.Seek(72);
     for (int i = 72; i < data.Length; i++)
     {
         Assert.AreEqual(data[i], (byte)rafoa.Read());
     }
 }

 /**
 * returns an Image representing the given page.
 * @param ra    the file or array containing the image
 * @param page  the page number of the image
 * @return  an Image object
 */
 public static Image GetJbig2Image(RandomAccessFileOrArray ra, int page) {
     if (page < 1)
         throw new ArgumentException(MessageLocalization.GetComposedMessage("the.page.number.must.be.gt.eq.1"));
     
     JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
     sr.Read();
     JBIG2SegmentReader.JBIG2Page p = sr.GetPage(page);
     Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.GetData(true), sr.GetGlobal(true));
     return img;
 }

 virtual public void TestFilePositionWithPushback()
 {
     RandomAccessFileOrArray rafoa = new RandomAccessFileOrArray(new RandomAccessSourceFactory().CreateSource(data));
     long offset = 72;
     rafoa.Seek(offset);
     Assert.AreEqual(offset, rafoa.FilePointer);
     byte pushbackVal = 42;
     rafoa.PushBack(pushbackVal);
     Assert.AreEqual(offset - 1, rafoa.FilePointer);
 }

 virtual public void SetUp()
 {
     MemoryStream os = new MemoryStream();
     for (int i = 0; i < 10000; i++)
     {
         os.WriteByte((byte)i);
     }
     data = os.ToArray();
     rafoa = new RandomAccessFileOrArray(new RandomAccessSourceFactory().CreateSource(data));
 }

// ---------------------------------------------------------------------------    
    public void AddJBIG2(Document document, String path) {
      RandomAccessFileOrArray ra = new RandomAccessFileOrArray(path);
      int n = JBIG2Image.GetNumberOfPages(ra);
      Image img;
      for (int i = 1; i <= n; i++) {
        img = JBIG2Image.GetJbig2Image(ra, i);
        img.ScaleToFit(523, 350);
        document.Add(img);
      }
    }

 /**
 * returns an Image representing the given page.
 * @param ra    the file or array containing the image
 * @param page  the page number of the image
 * @return  an Image object
 */
 public static Image GetJbig2Image(RandomAccessFileOrArray ra, int page) {
     if (page < 1)
         throw new ArgumentException("The page number must be >= 1.");
     
     JBIG2SegmentReader sr = new JBIG2SegmentReader(ra);
     sr.Read();
     JBIG2SegmentReader.JBIG2Page p = sr.GetPage(page);
     Image img = new ImgJBIG2(p.pageBitmapWidth, p.pageBitmapHeight, p.GetData(true), sr.GetGlobal(true));
     return img;
 }

        public static void ExtractImagesFromPDF(string sourcePdf, string outputPath)
        {
            // NOTE:  This will only get the first image it finds per page.
            PdfReader pdf = new PdfReader(sourcePdf);
            RandomAccessFileOrArray raf = new iTextSharp.text.pdf.RandomAccessFileOrArray(sourcePdf);

            try
            {
                for (int pageNumber = 1; pageNumber <= pdf.NumberOfPages; pageNumber++)
                {
                    PdfDictionary pg = pdf.GetPageN(pageNumber);

                    // recursively search pages, forms and groups for images.
                    PdfObject obj = FindImageInPDFDictionary(pg);
                    if (obj != null)
                    {

                        int XrefIndex = Convert.ToInt32(((PRIndirectReference)obj).Number.ToString(System.Globalization.CultureInfo.InvariantCulture));
                        PdfObject pdfObj = pdf.GetPdfObject(XrefIndex);
                        PdfStream pdfStrem = (PdfStream)pdfObj;
                        byte[] bytes = PdfReader.GetStreamBytesRaw((PRStream)pdfStrem);
                        if ((bytes != null))
                        {
                            using (System.IO.MemoryStream memStream = new System.IO.MemoryStream(bytes))
                            {
                                memStream.Position = 0;
                                System.Drawing.Image img = System.Drawing.Image.FromStream(memStream);
                                // must save the file while stream is open.
                                if (!Directory.Exists(outputPath))
                                    Directory.CreateDirectory(outputPath);

                                string path = Path.Combine(outputPath, String.Format(@"{0}.jpg", pageNumber));
                                System.Drawing.Imaging.EncoderParameters parms = new System.Drawing.Imaging.EncoderParameters(1);
                                parms.Param[0] = new System.Drawing.Imaging.EncoderParameter(System.Drawing.Imaging.Encoder.Compression, 0);
                                System.Drawing.Imaging.ImageCodecInfo jpegEncoder = GetImageEncoder("JPEG");
                                img.Save(path, jpegEncoder, parms);
                            }
                        }
                    }
                }
            }
            catch
            {
                throw;
            }
            finally
            {
                pdf.Close();
                raf.Close();
            }


        }

 internal EnumerateTTC(byte[] ttcArray) {
     fileName = "Byte array TTC";
     rf = new RandomAccessFileOrArray(ttcArray);
     FindNames();
 }

 private static long ReadUnsignedInt(RandomAccessFileOrArray stream,
 bool isBigEndian)
 {
     if (isBigEndian) {
         return stream.ReadUnsignedInt();
     } else {
         return stream.ReadUnsignedIntLE();
     }
 }

 private float ReadFloat(RandomAccessFileOrArray stream)
 {
     if (isBigEndian) {
         return stream.ReadFloat();
     } else {
         return stream.ReadFloatLE();
     }
 }

 private int ReadInt(RandomAccessFileOrArray stream)
 {
     if (isBigEndian) {
         return stream.ReadInt();
     } else {
         return stream.ReadIntLE();
     }
 }

 private void Initialize(RandomAccessFileOrArray stream) {
     long nextTagOffset = 0L;
     long maxOffset = (long) stream.Length;
     int i, j;
     
     IFDOffset = stream.FilePointer;
     
     numEntries = ReadUnsignedShort(stream);
     fields = new TIFFField[numEntries];
     
     for (i = 0; (i < numEntries) && (nextTagOffset < maxOffset); i++) {
         int tag = ReadUnsignedShort(stream);
         int type = ReadUnsignedShort(stream);
         int count = (int)(ReadUnsignedInt(stream));
         bool processTag = true;
         
         // The place to return to to read the next tag
         nextTagOffset = stream.FilePointer + 4;
         
         try {
             // If the tag data can't fit in 4 bytes, the next 4 bytes
             // contain the starting offset of the data
             if (count*sizeOfType[type] > 4) {
                 long valueOffset = ReadUnsignedInt(stream);
                 
                 // bounds check offset for EOF
                 if (valueOffset < maxOffset) {
             	    stream.Seek(valueOffset);
                 }
                 else {
             	    // bad offset pointer .. skip tag
             	    processTag = false;
                 }
             }
         } catch (ArgumentOutOfRangeException) {
             // if the data type is unknown we should skip this TIFF Field
             processTag = false;
         }
         
         if (processTag) {
         fieldIndex[tag] = i;
         Object obj = null;
         
         switch (type) {
             case TIFFField.TIFF_BYTE:
             case TIFFField.TIFF_SBYTE:
             case TIFFField.TIFF_UNDEFINED:
             case TIFFField.TIFF_ASCII:
                 byte[] bvalues = new byte[count];
                 stream.ReadFully(bvalues, 0, count);
                 
                 if (type == TIFFField.TIFF_ASCII) {
                     
                     // Can be multiple strings
                     int index = 0, prevIndex = 0;
                     List<string> v = new List<string>();
                     
                     while (index < count) {
                         
                         while ((index < count) && (bvalues[index++] != 0));
                         
                         // When we encountered zero, means one string has ended
                         char[] cht = new char[index - prevIndex];
                         Array.Copy(bvalues, prevIndex, cht, 0, index - prevIndex);
                         v.Add(new String(cht));
                         prevIndex = index;
                     }
                     
                     count = v.Count;
                     String[] strings = new String[count];
                     for (int c = 0 ; c < count; c++) {
                         strings[c] = v[c];
                     }
                     
                     obj = strings;
                 } else {
                     obj = bvalues;
                 }
                 
                 break;
                 
             case TIFFField.TIFF_SHORT:
                 char[] cvalues = new char[count];
                 for (j = 0; j < count; j++) {
                     cvalues[j] = (char)(ReadUnsignedShort(stream));
                 }
                 obj = cvalues;
                 break;
                 
             case TIFFField.TIFF_LONG:
                 long[] lvalues = new long[count];
                 for (j = 0; j < count; j++) {
                     lvalues[j] = ReadUnsignedInt(stream);
                 }
                 obj = lvalues;
                 break;
                 
             case TIFFField.TIFF_RATIONAL:
                 long[][] llvalues = new long[count][];
                 for (j = 0; j < count; j++) {
//.........这里部分代码省略.........