using System;
using System.IO;
using pdftron;
using pdftron.PDF;
using pdftron.SDF;

namespace PDFNetFailed {
	class Program {
		static void ProcessElements(ElementReader reader) {
			Element element;
			while ((element = reader.Next()) != null){
				switch (element.GetType()) {
					case Element.Type.e_text_begin: {
							ProcessText(reader);
							break;
						}
					case Element.Type.e_form: {
						reader.FormBegin();
						ProcessElements(reader);
						reader.End();
						break;
					}
				}
			}
		}

		static void ProcessText(ElementReader page_reader) {
			Element element;
			while ((element = page_reader.Next()) != null) {
				switch (element.GetType()) {
					case Element.Type.e_text_end:
						return;
					case Element.Type.e_text: {
							GState gs = element.GetGState();
							Font font = gs.GetFont();
							if (font.GetType() == Font.Type.e_Type3) {
								for (CharIterator itr = element.GetCharIterator(); itr.HasNext(); itr.Next()) {
									CharData charData = itr.Current();
									Obj type3GlyphStream = font.GetType3GlyphStream(charData.char_code);
									if (type3GlyphStream != null) {
										using (var reader = new ElementReader()) {
											reader.Begin(type3GlyphStream);
												Element el;
												while ((el = reader.Next()) != null) {
													// fails while iterating
												}
											reader.End();
										}
									}

									page_reader.Type3FontBegin(itr.Current());
									ProcessElements(page_reader);
									page_reader.End();
								}
							}
							break;
						}
				}
			}
		}

		static void Main(string[] args) {
			try {
				PDFNet.Initialize();
				using (var doc = new PDFDoc("input.pdf")) {
					doc.InitSecurityHandler();
					int pageCount = doc.GetPageCount();

					for (int i = 1; i <= pageCount; i++) {
						Page page = doc.GetPage(i);
						using (var elementReader = new ElementReader()) {
							elementReader.Begin(page);
							ProcessElements(elementReader);
							elementReader.End();
						}
					}
				}
			} catch(Exception ex) {
				Console.WriteLine(ex);
			} finally {
				Console.WriteLine("Completed");
				Console.ReadKey();
			}
		}
	}
}