From 48afdad75f42b1eb165e87ffd69ae1195ada9350 Mon Sep 17 00:00:00 2001
From: Tor Andersson <tor.andersson@artifex.com>
Date: Thu, 7 Jan 2016 14:21:23 +0100
Subject: pdf: Add function to look up the page for a named destination.

---
 include/mupdf/pdf/page.h |  8 ++++++++
 source/pdf/pdf-page.c    | 18 ++++++++++++++++++
 2 files changed, 26 insertions(+)

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
@@ -5,6 +5,14 @@ int pdf_lookup_page_number(fz_context *ctx, pdf_document *doc, pdf_obj *pageobj)
 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.
 
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)
 {
-- 
cgit v1.2.3