From f92e1fa160bc24dcec181101c6dd2002718f3a29 Mon Sep 17 00:00:00 2001
From: Calixte Denizet <calixte.denizet@gmail.com>
Date: Fri, 14 May 2021 18:34:51 +0200
Subject: [PATCH] Replace terminal null char by a endchar command in CFF
 charstrings to make OTS happy

---
 src/core/cff_parser.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/core/cff_parser.js b/src/core/cff_parser.js
index a6c7bae35..32d1effe9 100644
--- a/src/core/cff_parser.js
+++ b/src/core/cff_parser.js
@@ -599,6 +599,12 @@ const CFFParser = (function CFFParserClosure() {
         } else if (value === 11) {
           state.stackSize = stackSize;
           return true;
+        } else if (value === 0 && j === data.length) {
+          // Operator 0 is not used according to the current spec and
+          // it's the last char and consequently it's likely a terminator.
+          // So just replace it by endchar command to make OTS happy.
+          data[j - 1] = 14;
+          validationCommand = CharstringValidationData[14];
         } else {
           validationCommand = CharstringValidationData[value];
         }