--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/source/xps/xps-link.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,232 @@
+// Copyright (C) 2004-2022 Artifex Software, Inc.
+//
+// This file is part of MuPDF.
+//
+// MuPDF is free software: you can redistribute it and/or modify it under the
+// terms of the GNU Affero General Public License as published by the Free
+// Software Foundation, either version 3 of the License, or (at your option)
+// any later version.
+//
+// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
+// details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
+//
+// Alternative licensing terms are available from the licensor.
+// For commercial licensing, see <https://www.artifex.com/> or contact
+// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
+// CA 94129, USA, for further information.
+
+#include "mupdf/fitz.h"
+#include "xps-imp.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+/* Quick parsing of document to find links. */
+
+static void
+xps_load_links_in_element(fz_context *ctx, xps_document *doc, fz_matrix ctm,
+		char *base_uri, xps_resource *dict, fz_xml *node, fz_link **link);
+
+static void
+xps_add_link(fz_context *ctx, xps_document *doc, fz_rect area, char *base_uri, char *target_uri, fz_link **head)
+{
+	fz_link *link = fz_new_derived_link(ctx, fz_link, area, target_uri);
+	link->next = *head;
+	*head = link;
+}
+
+static void
+xps_load_links_in_path(fz_context *ctx, xps_document *doc, fz_matrix ctm,
+		char *base_uri, xps_resource *dict, fz_xml *root, fz_link **link)
+{
+	char *navigate_uri_att = fz_xml_att(root, "FixedPage.NavigateUri");
+	if (navigate_uri_att)
+	{
+		char *transform_att = fz_xml_att(root, "RenderTransform");
+		fz_xml *transform_tag = fz_xml_down(fz_xml_find_down(root, "Path.RenderTransform"));
+
+		char *data_att = fz_xml_att(root, "Data");
+		fz_xml *data_tag = fz_xml_down(fz_xml_find_down(root, "Path.Data"));
+
+		fz_path *path = NULL;
+		int fill_rule;
+		fz_rect area;
+
+		xps_resolve_resource_reference(ctx, doc, dict, &data_att, &data_tag, NULL);
+		xps_resolve_resource_reference(ctx, doc, dict, &transform_att, &transform_tag, NULL);
+
+		ctm = xps_parse_transform(ctx, doc, transform_att, transform_tag, ctm);
+
+		if (data_att)
+			path = xps_parse_abbreviated_geometry(ctx, doc, data_att, &fill_rule);
+		else if (data_tag)
+			path = xps_parse_path_geometry(ctx, doc, dict, data_tag, 0, &fill_rule);
+		if (path)
+		{
+			fz_try(ctx)
+				area = fz_bound_path(ctx, path, NULL, ctm);
+			fz_always(ctx)
+				fz_drop_path(ctx, path);
+			fz_catch(ctx)
+				fz_rethrow(ctx);
+			xps_add_link(ctx, doc, area, base_uri, navigate_uri_att, link);
+		}
+	}
+}
+
+static void
+xps_load_links_in_glyphs(fz_context *ctx, xps_document *doc, fz_matrix ctm,
+		char *base_uri, xps_resource *dict, fz_xml *root, fz_link **link)
+{
+	char *navigate_uri_att = fz_xml_att(root, "FixedPage.NavigateUri");
+	if (navigate_uri_att)
+	{
+		char *transform_att = fz_xml_att(root, "RenderTransform");
+		fz_xml *transform_tag = fz_xml_down(fz_xml_find_down(root, "Path.RenderTransform"));
+
+		char *bidi_level_att = fz_xml_att(root, "BidiLevel");
+		char *font_size_att = fz_xml_att(root, "FontRenderingEmSize");
+		char *font_uri_att = fz_xml_att(root, "FontUri");
+		char *origin_x_att = fz_xml_att(root, "OriginX");
+		char *origin_y_att = fz_xml_att(root, "OriginY");
+		char *is_sideways_att = fz_xml_att(root, "IsSideways");
+		char *indices_att = fz_xml_att(root, "Indices");
+		char *unicode_att = fz_xml_att(root, "UnicodeString");
+		char *style_att = fz_xml_att(root, "StyleSimulations");
+
+		int is_sideways = 0;
+		int bidi_level = 0;
+		fz_font *font;
+		fz_text *text = NULL;
+		fz_rect area;
+
+		xps_resolve_resource_reference(ctx, doc, dict, &transform_att, &transform_tag, NULL);
+
+		ctm = xps_parse_transform(ctx, doc, transform_att, transform_tag, ctm);
+
+		if (is_sideways_att)
+			is_sideways = !strcmp(is_sideways_att, "true");
+		if (bidi_level_att)
+			bidi_level = atoi(bidi_level_att);
+
+		font = xps_lookup_font(ctx, doc, base_uri, font_uri_att, style_att);
+		if (!font)
+			return;
+
+		fz_var(text);
+		fz_try(ctx)
+		{
+			text = xps_parse_glyphs_imp(ctx, doc, ctm, font, fz_atof(font_size_att),
+					fz_atof(origin_x_att), fz_atof(origin_y_att),
+					is_sideways, bidi_level, indices_att, unicode_att);
+			area = fz_bound_text(ctx, text, NULL, ctm);
+		}
+		fz_always(ctx)
+		{
+			fz_drop_text(ctx, text);
+			fz_drop_font(ctx, font);
+		}
+		fz_catch(ctx)
+			fz_rethrow(ctx);
+
+		xps_add_link(ctx, doc, area, base_uri, navigate_uri_att, link);
+	}
+}
+
+static void
+xps_load_links_in_canvas(fz_context *ctx, xps_document *doc, fz_matrix ctm,
+		char *base_uri, xps_resource *dict, fz_xml *root, fz_link **link)
+{
+	xps_resource *new_dict = NULL;
+	fz_xml *node;
+
+	char *navigate_uri_att = fz_xml_att(root, "FixedPage.NavigateUri");
+	char *transform_att = fz_xml_att(root, "RenderTransform");
+	fz_xml *transform_tag = fz_xml_down(fz_xml_find_down(root, "Canvas.RenderTransform"));
+	fz_xml *resource_tag = fz_xml_down(fz_xml_find_down(root, "Canvas.Resources"));
+
+	if (resource_tag)
+	{
+		new_dict = xps_parse_resource_dictionary(ctx, doc, base_uri, resource_tag);
+		if (new_dict)
+		{
+			new_dict->parent = dict;
+			dict = new_dict;
+		}
+	}
+
+	xps_resolve_resource_reference(ctx, doc, dict, &transform_att, &transform_tag, NULL);
+
+	ctm = xps_parse_transform(ctx, doc, transform_att, transform_tag, ctm);
+
+	if (navigate_uri_att)
+		fz_warn(ctx, "FixedPage.NavigateUri attribute on Canvas element");
+
+	for (node = fz_xml_down(root); node; node = fz_xml_next(node))
+		xps_load_links_in_element(ctx, doc, ctm, base_uri, dict, node, link);
+
+	if (new_dict)
+		xps_drop_resource_dictionary(ctx, doc, new_dict);
+}
+
+static void
+xps_load_links_in_element(fz_context *ctx, xps_document *doc, fz_matrix ctm, char *base_uri, xps_resource *dict, fz_xml *node, fz_link **link)
+{
+	if (fz_xml_is_tag(node, "Path"))
+		xps_load_links_in_path(ctx, doc, ctm, base_uri, dict, node, link);
+	else if (fz_xml_is_tag(node, "Glyphs"))
+		xps_load_links_in_glyphs(ctx, doc, ctm, base_uri, dict, node, link);
+	else if (fz_xml_is_tag(node, "Canvas"))
+		xps_load_links_in_canvas(ctx, doc, ctm, base_uri, dict, node, link);
+	else if (fz_xml_is_tag(node, "AlternateContent"))
+	{
+		node = xps_lookup_alternate_content(ctx, doc, node);
+		if (node)
+			xps_load_links_in_element(ctx, doc, ctm, base_uri, dict, node, link);
+	}
+}
+
+static void
+xps_load_links_in_fixed_page(fz_context *ctx, xps_document *doc, fz_matrix ctm, xps_page *page, fz_link **link)
+{
+	fz_xml *root, *node, *resource_tag;
+	xps_resource *dict = NULL;
+	char base_uri[1024];
+	char *s;
+
+	root = fz_xml_root(page->xml);
+
+	if (!root)
+		return;
+
+	fz_strlcpy(base_uri, page->fix->name, sizeof base_uri);
+	s = strrchr(base_uri, '/');
+	if (s)
+		s[1] = 0;
+
+	resource_tag = fz_xml_down(fz_xml_find_down(root, "FixedPage.Resources"));
+	if (resource_tag)
+		dict = xps_parse_resource_dictionary(ctx, doc, base_uri, resource_tag);
+
+	for (node = fz_xml_down(root); node; node = fz_xml_next(node))
+		xps_load_links_in_element(ctx, doc, ctm, base_uri, dict, node, link);
+
+	if (dict)
+		xps_drop_resource_dictionary(ctx, doc, dict);
+}
+
+fz_link *
+xps_load_links(fz_context *ctx, fz_page *page_)
+{
+	xps_page *page = (xps_page*)page_;
+	fz_matrix ctm;
+	fz_link *link = NULL;
+	ctm = fz_scale(72.0f / 96.0f, 72.0f / 96.0f);
+	xps_load_links_in_fixed_page(ctx, (xps_document*)page->super.doc, ctm, page, &link);
+	return link;
+}