1 files changed, 17 insertions, 0 deletions
diff --git a/ext/node/polyfills/internal_binding/_utils.ts b/ext/node/polyfills/internal_binding/_utils.ts
index 74dc3cbcd..0b1e1709d 100644
--- a/ext/node/polyfills/internal_binding/_utils.ts
+++ b/ext/node/polyfills/internal_binding/_utils.ts
@@ -7,6 +7,7 @@ import {
   forgivingBase64Decode,
   forgivingBase64UrlDecode,
 } from "ext:deno_web/00_infra.js";
+import { op_base64_write } from "ext:core/ops";
 
 export function asciiToBytes(str: string) {
   const length = str.length;
@@ -27,6 +28,22 @@ export function base64ToBytes(str: string) {
   }
 }
 
+export function base64Write(
+  str: string,
+  buffer: Uint8Array,
+  offset: number = 0,
+  length?: number,
+): number {
+  length = length ?? buffer.byteLength - offset;
+  try {
+    return op_base64_write(str, buffer, offset, length);
+  } catch {
+    str = base64clean(str);
+    str = str.replaceAll("-", "+").replaceAll("_", "/");
+    return op_base64_write(str, buffer, offset, length);
+  }
+}
+
 const INVALID_BASE64_RE = /[^+/0-9A-Za-z-_]/g;
 function base64clean(str: string) {
   // Node takes equal signs as end of the Base64 encoding