A bit more of GooString -> std::string

diff --git a/poppler/PageLabelInfo.cc b/poppler/PageLabelInfo.cc
index 779f75b..ec9c5be 100644
--- a/poppler/PageLabelInfo.cc
+++ b/poppler/PageLabelInfo.cc

@@ -170,7 +170,7 @@
     char buffer[32];
     int base, number;
     const Interval *matching_interval;
-    GooString number_string;
+    std::string number_string;
 
     base = 0;
     matching_interval = nullptr;
@@ -218,11 +218,11 @@
         len = number_string.size();
         ucs2_char[0] = 0;
         for (i = 0; i < len; ++i) {
-            ucs2_char[1] = number_string.getChar(i);
+            ucs2_char[1] = number_string[i];
             label->append(ucs2_char, 2);
         }
     } else {
-        label->append(number_string.toStr());
+        label->append(number_string);
     }
 
     return true;

diff --git a/poppler/PageLabelInfo_p.h b/poppler/PageLabelInfo_p.h
index 7fccf31..52dfd0d 100644
--- a/poppler/PageLabelInfo_p.h
+++ b/poppler/PageLabelInfo_p.h

@@ -3,7 +3,7 @@
 // This file is under the GPLv2 or later license
 //
 // Copyright (C) 2005-2006 Kristian Høgsberg <krh@redhat.com>
-// Copyright (C) 2005, 2009, 2014, 2019, 2020, 2022 Albert Astals Cid <aacid@kde.org>
+// Copyright (C) 2005, 2009, 2014, 2019, 2020, 2022, 2026 Albert Astals Cid <aacid@kde.org>
 // Copyright (C) 2011 Simon Kellner <kellner@kit.edu>
 // Copyright (C) 2012 Fabio D'Urso <fabiodurso@hotmail.it>
 // Copyright (C) 2018 Adam Reichold <adam.reichold@t-online.de>
@@ -113,7 +113,7 @@
     return value;
 }
 
-static void toRoman(int number, GooString *str, bool uppercase)
+static void toRoman(int number, std::string *str, bool uppercase)
 {
     static const char uppercaseNumerals[] = "IVXLCDM";
     static const char lowercaseNumerals[] = "ivxlcdm";
@@ -191,7 +191,7 @@
     return -1;
 }
 
-static void toLatin(int number, GooString *str, bool uppercase)
+static void toLatin(int number, std::string *str, bool uppercase)
 {
     char base, letter;
     int i, count;

diff --git a/qt5/tests/check_pagelabelinfo.cpp b/qt5/tests/check_pagelabelinfo.cpp
index 9cd4ea0..35c4416 100644
--- a/qt5/tests/check_pagelabelinfo.cpp
+++ b/qt5/tests/check_pagelabelinfo.cpp

@@ -38,27 +38,27 @@
 
 void TestPageLabelInfo::testToRoman()
 {
-    GooString str;
+    std::string str;
     toRoman(177, &str, false);
     QCOMPARE(str.c_str(), "clxxvii");
 }
 
 void TestPageLabelInfo::testFromRoman()
 {
-    GooString roman("clxxvii");
+    const std::string roman("clxxvii");
     QCOMPARE(fromRoman(roman.c_str()), 177);
 }
 
 void TestPageLabelInfo::testToLatin()
 {
-    GooString str;
+    std::string str;
     toLatin(54, &str, false);
     QCOMPARE(str.c_str(), "bbb");
 }
 
 void TestPageLabelInfo::testFromLatin()
 {
-    GooString latin("ddd");
+    const std::string latin("ddd");
     QCOMPARE(fromLatin(latin.c_str()), 56);
 }
 

diff --git a/qt6/tests/check_pagelabelinfo.cpp b/qt6/tests/check_pagelabelinfo.cpp
index 9cd4ea0..35c4416 100644
--- a/qt6/tests/check_pagelabelinfo.cpp
+++ b/qt6/tests/check_pagelabelinfo.cpp

@@ -38,27 +38,27 @@
 
 void TestPageLabelInfo::testToRoman()
 {
-    GooString str;
+    std::string str;
     toRoman(177, &str, false);
     QCOMPARE(str.c_str(), "clxxvii");
 }
 
 void TestPageLabelInfo::testFromRoman()
 {
-    GooString roman("clxxvii");
+    const std::string roman("clxxvii");
     QCOMPARE(fromRoman(roman.c_str()), 177);
 }
 
 void TestPageLabelInfo::testToLatin()
 {
-    GooString str;
+    std::string str;
     toLatin(54, &str, false);
     QCOMPARE(str.c_str(), "bbb");
 }
 
 void TestPageLabelInfo::testFromLatin()
 {
-    GooString latin("ddd");
+    const std::string latin("ddd");
     QCOMPARE(fromLatin(latin.c_str()), 56);
 }