text: #include "mupdf/pdf.h"
  
  static fz_outline *
  pdf_load_outline_imp(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
  {
  	fz_outline *node, **prev, *first;
  	pdf_obj *obj;
  	pdf_obj *odict = dict;
  
  	fz_var(dict);
  	fz_var(first);
  
  	fz_try(ctx)
  	{
  		first = NULL;
  		prev = &first;
  		while (dict && pdf_is_dict(ctx, dict))
  		{
  			if (pdf_mark_obj(ctx, dict))
  				break;
  			node = fz_malloc_struct(ctx, fz_outline);
  			node->title = NULL;
  			node->dest.kind = FZ_LINK_NONE;
  			node->down = NULL;
  			node->next = NULL;
  			node->is_open = 0;
  			*prev = node;
  			prev = &node->next;
  
  			obj = pdf_dict_get(ctx, dict, PDF_NAME_Title);
  			if (obj)
  				node->title = pdf_to_utf8(ctx, doc, obj);
  
  			if ((obj = pdf_dict_get(ctx, dict, PDF_NAME_Dest)) != NULL)
  				node->dest = pdf_parse_link_dest(ctx, doc, FZ_LINK_GOTO, obj);
  			else if ((obj = pdf_dict_get(ctx, dict, PDF_NAME_A)) != NULL)
  				node->dest = pdf_parse_action(ctx, doc, obj);
  
  			obj = pdf_dict_get(ctx, dict, PDF_NAME_First);
  			if (obj)
  			{
  				node->down = pdf_load_outline_imp(ctx, doc, obj);
  
  				obj = pdf_dict_get(ctx, dict, PDF_NAME_Count);
  				if (pdf_to_int(ctx, obj) > 0)
  					node->is_open = 1;
  			}
  
  			dict = pdf_dict_get(ctx, dict, PDF_NAME_Next);
  		}
  	}
  	fz_always(ctx)
  	{
  		for (dict = odict; dict && pdf_obj_marked(ctx, dict); dict = pdf_dict_get(ctx, dict, PDF_NAME_Next))
  			pdf_unmark_obj(ctx, dict);
  	}
  	fz_catch(ctx)
  	{
  		fz_drop_outline(ctx, first);
  		fz_rethrow(ctx);
  	}
  
  	return first;
  }
  
  fz_outline *
  pdf_load_outline(fz_context *ctx, pdf_document *doc)
  {
  	pdf_obj *root, *obj, *first;
  
  	root = pdf_dict_get(ctx, pdf_trailer(ctx, doc), PDF_NAME_Root);
  	obj = pdf_dict_get(ctx, root, PDF_NAME_Outlines);
  	first = pdf_dict_get(ctx, obj, PDF_NAME_First);
  	if (first)
  		return pdf_load_outline_imp(ctx, doc, first);
  
  	return NULL;
  }
  