From f9b740c94b3aa832a01f682c4cd09ab1b0112bb8 Mon Sep 17 00:00:00 2001
From: Anton Thomasson <antonthomasson@gmail.com>
Date: Fri, 19 Aug 2022 18:32:06 +0200
Subject: [PATCH] Ensure increasing page range list

---
 src/rangelistchecker.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/rangelistchecker.cpp b/src/rangelistchecker.cpp
index 2674bfb..4b13027 100644
--- a/src/rangelistchecker.cpp
+++ b/src/rangelistchecker.cpp
@@ -33,9 +33,15 @@ QJsonArray RangeListChecker::parse(QString str) const
     PrintParameters params;
     params.setPageRange(str.toStdString());
     QJsonArray ret;
+    size_t previous = 0;
     for(const std::pair<size_t, size_t>& p : params.pageRangeList)
     {
+        if(p.first <= previous)
+        {
+            return {};
+        }
         ret.append(QJsonObject {{"low", int(p.first)}, {"high", int(p.second)}});
+        previous = p.second;
     }
     return ret;
 }