From 35d8e7e63f90ef5c1710108a52ad829e24f630bd Mon Sep 17 00:00:00 2001
From: Timothy Flynn <trflynn89@pm.me>
Date: Sun, 1 Sep 2024 11:49:23 -0400
Subject: [PATCH] AK: Add a public helper to count the decoded length of a
 Base64 string

---
 AK/Base64.cpp | 7 ++++++-
 AK/Base64.h   | 2 ++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/AK/Base64.cpp b/AK/Base64.cpp
index 8c1806f9fc8..c4155e12fcf 100644
--- a/AK/Base64.cpp
+++ b/AK/Base64.cpp
@@ -12,10 +12,15 @@
 
 namespace AK {
 
+size_t size_required_to_decode_base64(StringView input)
+{
+    return simdutf::maximal_binary_length_from_base64(input.characters_without_null_termination(), input.length());
+}
+
 static ErrorOr<ByteBuffer> decode_base64_impl(StringView input, simdutf::base64_options options)
 {
     ByteBuffer output;
-    TRY(output.try_resize(simdutf::maximal_binary_length_from_base64(input.characters_without_null_termination(), input.length())));
+    TRY(output.try_resize(size_required_to_decode_base64(input)));
 
     auto result = simdutf::base64_to_binary(
         input.characters_without_null_termination(),
diff --git a/AK/Base64.h b/AK/Base64.h
index 51db98ab664..f448a0f9657 100644
--- a/AK/Base64.h
+++ b/AK/Base64.h
@@ -13,6 +13,8 @@
 
 namespace AK {
 
+size_t size_required_to_decode_base64(StringView);
+
 ErrorOr<ByteBuffer> decode_base64(StringView);
 ErrorOr<ByteBuffer> decode_base64url(StringView);