public void ReadsEmptySection() { // Arrange XRefSection section; using (var pdfStream = new MemoryStream()) { using (var sw = new StreamWriter(pdfStream, Encoding.ASCII, 128, true)) { sw.WriteLine("xref"); sw.WriteLine("0 0"); sw.WriteLine("trailer"); } pdfStream.Seek(0, SeekOrigin.Begin); // Act using (var reader = new PdfReader(pdfStream)) { section = XRefSection.FromReader(reader); } } // Assert Assert.NotNull(section); Assert.NotNull(section.Entries); Assert.Equal(0, section.Entries.Count); }
public void ReadsSimpleSection() { // Arrange XRefSection section; using (var pdfStream = new MemoryStream()) { using (var sw = new StreamWriter(pdfStream, Encoding.ASCII, 128, true)) { sw.WriteLine("xref"); sw.WriteLine("0 6"); sw.Write("0000000003 65535 f\r\n"); sw.Write("0000000017 00000 n\r\n"); sw.Write("0000000081 00000 n\r\n"); sw.Write("0000000000 00007 f\r\n"); sw.Write("0000000331 00000 n\r\n"); sw.Write("0000000409 00000 n\r\n"); sw.WriteLine("trailer"); } pdfStream.Seek(0, SeekOrigin.Begin); // Act using (var reader = new PdfReader(pdfStream)) { section = XRefSection.FromReader(reader); } } // Assert Assert.NotNull(section); Assert.NotNull(section.Entries); Assert.Equal(6, section.Entries.Count); Assert.Equal(PdfObjectId.Zero, section.Entries[0].ObjectId); Assert.Equal(3, (section.Entries[0] as PdfFreeObjectReference).NextFreeObjectNumber); Assert.Equal(new PdfObjectId(1), section.Entries[1].ObjectId); Assert.Equal(17, (section.Entries[1] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(2), section.Entries[2].ObjectId); Assert.Equal(81, (section.Entries[2] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(3, 7), section.Entries[3].ObjectId); Assert.Equal(0, (section.Entries[3] as PdfFreeObjectReference).NextFreeObjectNumber); Assert.Equal(new PdfObjectId(4), section.Entries[4].ObjectId); Assert.Equal(331, (section.Entries[4] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(5), section.Entries[5].ObjectId); Assert.Equal(409, (section.Entries[5] as PdfObjectReference).Position); }
public void ReadsSubSections() { // Arrange XRefSection section; using (var pdfStream = new MemoryStream()) { using (var sw = new StreamWriter(pdfStream, Encoding.ASCII, 128, true)) { sw.WriteLine("xref"); sw.WriteLine("0 1"); sw.Write("0000000000 65535 f\r\n"); sw.WriteLine("3 1"); sw.Write("0000025325 00000 n\r\n"); sw.WriteLine("23 2"); sw.Write("0000025518 00002 n\r\n"); sw.Write("0000025635 00000 n\r\n"); sw.WriteLine("30 1"); sw.Write("0000025777 00000 n\r\n"); sw.WriteLine("trailer"); } pdfStream.Seek(0, SeekOrigin.Begin); // Act using (var reader = new PdfReader(pdfStream)) { section = XRefSection.FromReader(reader); } } // Assert Assert.NotNull(section); Assert.NotNull(section.Entries); Assert.Equal(5, section.Entries.Count); Assert.Equal(PdfObjectId.Zero, section.Entries[0].ObjectId); Assert.Equal(0, (section.Entries[0] as PdfFreeObjectReference).NextFreeObjectNumber); Assert.Equal(new PdfObjectId(3), section.Entries[3].ObjectId); Assert.Equal(25325, (section.Entries[3] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(23, 2), section.Entries[23].ObjectId); Assert.Equal(25518, (section.Entries[23] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(24), section.Entries[24].ObjectId); Assert.Equal(25635, (section.Entries[24] as PdfObjectReference).Position); Assert.Equal(new PdfObjectId(30), section.Entries[30].ObjectId); Assert.Equal(25777, (section.Entries[30] as PdfObjectReference).Position); }
/// <summary> /// Creates a new instance of the PdfDocument class from the IO stream. /// </summary> /// <param name="stream">The <see cref="Stream"/> on which to open the PdfDocument.</param> /// <returns></returns> public static PdfDocument Open(Stream stream) { if (stream == null) { throw new ArgumentNullException(nameof(stream)); } if (!stream.CanRead) { throw new ArgumentException("Cannot read stream", nameof(stream)); } var document = new PdfDocument(stream); using (var reader = new PdfReader(stream)) { // Check header document.pdfVersion = PdfVersion.FromReader(reader); // Check trailer reader.Position = reader.GetXRefPosition(); // Read Cross-Reference Table IPdfTrailer trailer; IXRefSection xrefSection; char fisrtChar; do { fisrtChar = reader.Peek(); if (fisrtChar == XRefSection.StartKeyword[0]) { // Cross-Reference Section xrefSection = XRefSection.FromReader(reader); trailer = PdfTrailer.FromReader(reader); } else if (char.IsDigit(fisrtChar)) { // Cross-Reference Stream var xrefStream = XRefStream.FromReader(reader); trailer = xrefStream; xrefSection = xrefStream; } else { throw new FormatException("Invalid Cross-Reference section."); } if (document.xrefTable == null) { // Initialize document's Cross-Reference Table document.xrefTable = new XRefTable(xrefSection, trailer.Size); } else { // Register section document.xrefTable.AddSection(xrefSection); } // Keep instance of last trailer if (document.trailer == null) { document.trailer = trailer; } // Seek to previous trailer if (trailer.Prev.HasValue) { reader.Position = trailer.Prev.Value; } }while (trailer.Prev != null); } return(document); }