From 38ea87ad8d69c3f20409c853476f0445de0036ae Mon Sep 17 00:00:00 2001
From: trobro <git@trobro.se>
Date: Wed, 9 Apr 2025 17:40:14 +0200
Subject: [PATCH] fix infinite loop for empty ml-string

---
 src/HJSON/HJSONParser.php          | 3 +--
 tests/assets/failStr9a_test.hjson  | 4 ++++
 tests/assets/strings3_result.hjson | 1 +
 tests/assets/strings3_result.json  | 1 +
 tests/assets/strings3_test.hjson   | 1 +
 5 files changed, 8 insertions(+), 2 deletions(-)
 create mode 100644 tests/assets/failStr9a_test.hjson
 create mode 100644 tests/assets/strings3_result.hjson
 create mode 100644 tests/assets/strings3_result.json
 create mode 100644 tests/assets/strings3_test.hjson

diff --git a/src/HJSON/HJSONParser.php b/src/HJSON/HJSONParser.php
index 1ba5e06..b6c110d 100644
--- a/src/HJSON/HJSONParser.php
+++ b/src/HJSON/HJSONParser.php
@@ -368,9 +368,8 @@ private function peek($offs)
     {
         $index = $this->at + $offs;
 
-        // Mimic old behavior with mb_substr
         if ($index < 0) {
-            $index = 0;
+            return null;
         }
         if ($index >= $this->textLengthChars) {
             return "";
diff --git a/tests/assets/failStr9a_test.hjson b/tests/assets/failStr9a_test.hjson
new file mode 100644
index 0000000..229b94d
--- /dev/null
+++ b/tests/assets/failStr9a_test.hjson
@@ -0,0 +1,4 @@
+[
+[
+=
+[[''''''
diff --git a/tests/assets/strings3_result.hjson b/tests/assets/strings3_result.hjson
new file mode 100644
index 0000000..e16c76d
--- /dev/null
+++ b/tests/assets/strings3_result.hjson
@@ -0,0 +1 @@
+""
diff --git a/tests/assets/strings3_result.json b/tests/assets/strings3_result.json
new file mode 100644
index 0000000..e16c76d
--- /dev/null
+++ b/tests/assets/strings3_result.json
@@ -0,0 +1 @@
+""
diff --git a/tests/assets/strings3_test.hjson b/tests/assets/strings3_test.hjson
new file mode 100644
index 0000000..9cad736
--- /dev/null
+++ b/tests/assets/strings3_test.hjson
@@ -0,0 +1 @@
+''''''