iTextSharp.text.pdf.TrueTypeFontUnicode.GetToUnicode C# (CSharp) Метод

        private PdfStream GetToUnicode(Object[] metrics) {
            if (metrics.Length == 0)
                return null;
            StringBuilder buf = new StringBuilder(
                "/CIDInit /ProcSet findresource begin\n" +
                "12 dict begin\n" +
                "begincmap\n" +
                "/CIDSystemInfo\n" +
                "<< /Registry (TTX+0)\n" +
                "/Ordering (T42UV)\n" +
                "/Supplement 0\n" +
                ">> def\n" +
                "/CMapName /TTX+0 def\n" +
                "/CMapType 2 def\n" +
                "1 begincodespacerange\n" +
                "<0000><FFFF>\n" +
                "endcodespacerange\n");
            int size = 0;
            for (int k = 0; k < metrics.Length; ++k) {
                if (size == 0) {
                    if (k != 0) {
                        buf.Append("endbfrange\n");
                    }
                    size = Math.Min(100, metrics.Length - k);
                    buf.Append(size).Append(" beginbfrange\n");
                }
                --size;
                int[] metric = (int[])metrics[k];
                string fromTo = ToHex(metric[0]);
                buf.Append(fromTo).Append(fromTo).Append(ToHex(metric[2])).Append('\n');
            }
            buf.Append(
                "endbfrange\n" +
                "endcmap\n" +
                "CMapName currentdict /CMap defineresource pop\n" +
                "end end\n");
            string s = buf.ToString();
            PdfStream stream = new PdfStream(PdfEncodings.ConvertToBytes(s, null));
            stream.FlateCompress(compressionLevel);
            return stream;
        }
    

        protected internal virtual void WriteFont(TrueTypeFontUnicode font, PdfIndirectReference refer, Object[] parms, byte[] rotbits)
        {
            Dictionary<int, int[]> longTag = (Dictionary<int, int[]>)parms[0];
            font.AddRangeUni(longTag, true, font.Subset);
            int[][] metrics = new int[longTag.Count][];
            longTag.Values.CopyTo(metrics, 0);
            Array.Sort(metrics, font);
            PdfIndirectReference ind_font = null;
            PdfObject pobj = null;
            PdfIndirectObject obj = null;
            PdfIndirectReference cidset = null;
            // sivan: cff
            if (font.Cff)
            {
                byte[] b = font.ReadCffFont();
                if (font.Subset || font.SubsetRanges != null)
                {
                    CFFFontSubset cff = new CFFFontSubset(new RandomAccessFileOrArray(b), longTag);
                    b = cff.Process(cff.GetNames()[0]);
                }
                pobj = new BaseFont.StreamFont(b, "CIDFontType0C", font.CompressionLevel);
                obj = writer.AddToBody(pobj);
                ind_font = obj.IndirectReference;
            }
            else
            {
                byte[] b;
                if (font.Subset || font.DirectoryOffset != 0)
                {
                    TrueTypeFontSubSet sb = new TrueTypeFontSubSet(font.FileName, new RandomAccessFileOrArray(font.Rf), longTag, font.DirectoryOffset, false, false);
                    b = sb.Process();
                }
                else
                {
                    b = font.GetFullFont();
                }
                int[] lengths = new int[] { b.Length };
                pobj = new BaseFont.StreamFont(b, lengths, font.CompressionLevel);
                obj = writer.AddToBody(pobj);
                ind_font = obj.IndirectReference;
            }
            String subsetPrefix = "";
            if (font.Subset)
                subsetPrefix = TrueTypeFontUnicode.CreateSubsetPrefix();
            PdfDictionary dic = font.GetFontDescriptor(ind_font, subsetPrefix, cidset);
            obj = writer.AddToBody(dic);
            ind_font = obj.IndirectReference;

            pobj = font.GetCIDFontType2(ind_font, subsetPrefix, metrics);
            obj = writer.AddToBody(pobj);
            ind_font = obj.IndirectReference;

            pobj = font.GetToUnicode(metrics);
            PdfIndirectReference toUnicodeRef = null;

            if (pobj != null)
            {
                obj = writer.AddToBody(pobj);
                toUnicodeRef = obj.IndirectReference;
            }

            pobj = font.GetFontBaseType(ind_font, subsetPrefix, toUnicodeRef);
            writer.AddToBody(pobj, refer);
        }