pdf: Add function to look up the page for a named destination.

2 files changed, 26 insertions, 0 deletions

diff --git a/include/mupdf/pdf/page.h b/include/mupdf/pdf/page.h
index 7cf6da44..1b8fa755 100644
--- a/include/mupdf/pdf/page.h
+++ b/include/mupdf/pdf/page.h
@@ -6,6 +6,14 @@ int pdf_count_pages(fz_context *ctx, pdf_document *doc);
 pdf_obj *pdf_lookup_page_obj(fz_context *ctx, pdf_document *doc, int needle);
 
 /*
+	pdf_lookup_anchor: Find the page number of a named destination.
+
+	For use with looking up the destination page of a fragment
+	identifier in hyperlinks: foo.pdf#bar.
+*/
+int pdf_lookup_anchor(fz_context *ctx, pdf_document *doc, const char *name);
+
+/*
 	pdf_load_page: Load a page and its resources.
 
 	Locates the page in the PDF document and loads the page and its
diff --git a/source/pdf/pdf-page.c b/source/pdf/pdf-page.c
index dcb0add4..d893d204 100644
--- a/source/pdf/pdf-page.c
+++ b/source/pdf/pdf-page.c
@@ -200,6 +200,24 @@ pdf_lookup_page_number(fz_context *ctx, pdf_document *doc, pdf_obj *node)
 	return total;
 }
 
+int
+pdf_lookup_anchor(fz_context *ctx, pdf_document *doc, const char *name)
+{
+	pdf_obj *needle, *dest;
+	fz_link_dest ld;
+
+	needle = pdf_new_string(ctx, doc, name, strlen(name));
+	fz_try(ctx)
+		dest = pdf_lookup_dest(ctx, doc, needle);
+	fz_always(ctx)
+		pdf_drop_obj(ctx, needle);
+	fz_catch(ctx)
+		fz_rethrow(ctx);
+
+	ld = pdf_parse_link_dest(ctx, doc, FZ_LINK_GOTO, dest);
+	return ld.ld.gotor.page;
+}
+
 static pdf_obj *
 pdf_lookup_inherited_page_item(fz_context *ctx, pdf_document *doc, pdf_obj *node, pdf_obj *key)
 {