make length max of length of buffer

Author: ArrayIterator

src/Utils/Buffer.php

@@ -35,6 +35,9 @@ public static function read(string $buffer, int &$offset, int $length): string
     {
         $out = substr($buffer, $offset, $length);
         $offset += $length;
+        if ($offset > ($max = strlen($buffer))) {
+            $offset = $max;
+        }
         return $out;
     }