From e5e82b96170d4407c4c3cea177726cbbe282f110 Mon Sep 17 00:00:00 2001
From: Jonas Jenwald <jonas.jenwald@gmail.com>
Date: Sun, 3 May 2026 13:07:12 +0200
Subject: [PATCH] Don't create a `DataView` for the "CFF " TrueType table in
 `readTableEntry`

Given that the "CFF " table may be replaced completely, during font-parsing, it shouldn't make sense to read and/or modify it piecewise.
---
 src/core/fonts.js | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/core/fonts.js b/src/core/fonts.js
index 42e08931d..f5b0efb1f 100644
--- a/src/core/fonts.js
+++ b/src/core/fonts.js
@@ -1519,6 +1519,12 @@ class Font {
         data[8] = data[9] = data[10] = data[11] = 0;
         data[17] |= 0x20; // Set font optimized for cleartype flag.
       }
+      // The "CFF " table may be replaced completely, hence its data shouldn't
+      // need to be read and/or modified piecewise through a `DataView`.
+      const view =
+        tag === "CFF "
+          ? null
+          : new DataView(data.buffer, data.byteOffset, data.byteLength);
 
       return {
         tag,
@@ -1526,7 +1532,7 @@ class Font {
         length,
         offset,
         data,
-        view: new DataView(data.buffer, data.byteOffset, data.byteLength),
+        view,
       };
     }