iTextSharp.text.pdf.PdfReader.CheckPRStreamLength C# (CSharp) Метод

        private void CheckPRStreamLength(PRStream stream) {
            int fileLength = tokens.Length;
            int start = stream.Offset;
            bool calc = false;
            int streamLength = 0;
            PdfObject obj = GetPdfObjectRelease(stream.Get(PdfName.LENGTH));
            if (obj != null && obj.Type == PdfObject.NUMBER) {
                streamLength = ((PdfNumber)obj).IntValue;
                if (streamLength + start > fileLength - 20)
                    calc = true;
                else {
                    tokens.Seek(start + streamLength);
                    String line = tokens.ReadString(20);
                    if (!line.StartsWith("\nendstream") &&
                    !line.StartsWith("\r\nendstream") &&
                    !line.StartsWith("\rendstream") &&
                    !line.StartsWith("endstream"))
                        calc = true;
                }
            }
            else
                calc = true;
            if (calc) {
                byte[] tline = new byte[16];
                tokens.Seek(start);
                while (true) {
                    int pos = tokens.FilePointer;
                    if (!tokens.ReadLineSegment(tline))
                        break;
                    if (Equalsn(tline, endstream)) {
                        streamLength = pos - start;
                        break;
                    }
                    if (Equalsn(tline, endobj)) {
                        tokens.Seek(pos - 16);
                        String s = tokens.ReadString(16);
                        int index = s.IndexOf("endstream");
                        if (index >= 0)
                            pos = pos - 16 + index;
                        streamLength = pos - start;
                        break;
                    }
                }
            }
            stream.Length = streamLength;
        }