iTextSharp.text.pdf.TrueTypeFont.ReadCMaps C# (CSharp) Метод

        internal void ReadCMaps()
        {
            int[] table_location;
            tables.TryGetValue("cmap", out table_location);
            if (table_location == null)
                throw new DocumentException(MessageLocalization.GetComposedMessage("table.1.does.not.exist.in.2", "cmap", fileName + style));
            rf.Seek(table_location[0]);
            rf.SkipBytes(2);
            int num_tables = rf.ReadUnsignedShort();
            fontSpecific = false;
            int map10 = 0;
            int map31 = 0;
            int map30 = 0;

            //add by james for cmap Ext.b
            int mapExt = 0;

            for (int k = 0; k < num_tables; ++k) {
                int platId = rf.ReadUnsignedShort();
                int platSpecId = rf.ReadUnsignedShort();
                int offset = rf.ReadInt();
                if (platId == 3 && platSpecId == 0) {
                    fontSpecific = true;
                    map30 = offset;
                }
                else if (platId == 3 && platSpecId == 1) {
                    map31 = offset;
                }
                else if (platId == 3 && platSpecId == 10)
                {
                    mapExt = offset;
                }

                if (platId == 1 && platSpecId == 0) {
                    map10 = offset;
                }

            }
            if (map10 > 0) {
                rf.Seek(table_location[0] + map10);
                int format = rf.ReadUnsignedShort();
                switch (format) {
                    case 0:
                        cmap10 = ReadFormat0();
                        break;
                    case 4:
                        cmap10 = ReadFormat4();
                        break;
                    case 6:
                        cmap10 = ReadFormat6();
                        break;
                }
            }
            if (map31 > 0) {
                rf.Seek(table_location[0] + map31);
                int format = rf.ReadUnsignedShort();
                if (format == 4) {
                    cmap31 = ReadFormat4();
                }
            }
            if (map30 > 0) {
                rf.Seek(table_location[0] + map30);
                int format = rf.ReadUnsignedShort();
                if (format == 4) {
                    cmap10 = ReadFormat4();
                }
            }
            if (mapExt > 0) {
                rf.Seek(table_location[0] + mapExt);
                int format = rf.ReadUnsignedShort();
                switch (format) {
                    case 0:
                        cmapExt = ReadFormat0();
                        break;
                    case 4:
                        cmapExt = ReadFormat4();
                        break;
                    case 6:
                        cmapExt = ReadFormat6();
                        break;
                    case 12:
                        cmapExt = ReadFormat12();
                        break;
                }
            }
        }