buffer: add isAscii method

PR-URL: https://github.com/nodejs/node/pull/46046
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>

1 files changed, 17 insertions, 0 deletions

diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index f7b008af36..b144b95ab4 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -1238,6 +1238,21 @@ static void IsUtf8(const FunctionCallbackInfo<Value>& args) {
   args.GetReturnValue().Set(simdutf::validate_utf8(abv.data(), abv.length()));
 }
 
+static void IsAscii(const FunctionCallbackInfo<Value>& args) {
+  Environment* env = Environment::GetCurrent(args);
+  CHECK_EQ(args.Length(), 1);
+  CHECK(args[0]->IsTypedArray() || args[0]->IsArrayBuffer() ||
+        args[0]->IsSharedArrayBuffer());
+  ArrayBufferViewContents<char> abv(args[0]);
+
+  if (abv.WasDetached()) {
+    return node::THROW_ERR_INVALID_STATE(
+        env, "Cannot validate on a detached buffer");
+  }
+
+  args.GetReturnValue().Set(simdutf::validate_ascii(abv.data(), abv.length()));
+}
+
 void SetBufferPrototype(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
@@ -1373,6 +1388,7 @@ void Initialize(Local<Object> target,
   SetMethodNoSideEffect(context, target, "encodeUtf8String", EncodeUtf8String);
 
   SetMethodNoSideEffect(context, target, "isUtf8", IsUtf8);
+  SetMethodNoSideEffect(context, target, "isAscii", IsAscii);
 
   target
       ->Set(context,
@@ -1430,6 +1446,7 @@ void RegisterExternalReferences(ExternalReferenceRegistry* registry) {
   registry->Register(EncodeUtf8String);
 
   registry->Register(IsUtf8);
+  registry->Register(IsAscii);
 
   registry->Register(StringSlice<ASCII>);
   registry->Register(StringSlice<BASE64>);