From 475129d6b181a9b17ec08bca70a1ac03e42e3b2b Mon Sep 17 00:00:00 2001
From: Robin Watts <Robin.Watts@artifex.com>
Date: Tue, 26 Jan 2021 19:44:56 +0000
Subject: [PATCH] Fix MuPDF-gl chapter/page handling.

Internally, fz_locations are numbered from 0. Externally we number from
1. Adjust when parsing.
---
 platform/gl/gl-main.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/platform/gl/gl-main.c b/platform/gl/gl-main.c
index 8ded96d63..523e0d1d9 100644
--- a/platform/gl/gl-main.c
+++ b/platform/gl/gl-main.c
@@ -1472,16 +1472,16 @@ parse_location(const char *anchor, fz_location *loc)
 	s = anchor;
 	while (*s >= '0' && *s <= '9')
 		s++;
-	loc->chapter = fz_atoi(anchor);
+	loc->chapter = fz_atoi(anchor)-1;
 	if (*s != ':')
 		return 0;
 	p = ++s;
 	while (*s >= '0' && *s <= '9')
 		s++;
 	if (s == p)
-		loc->page = 1;
+		loc->page = 0;
 	else
-		loc->page = atoi(p);
+		loc->page = fz_atoi(p)-1;
 
 	return 1;
 }
-- 
2.38.5