From 2d76238f9184c9009bfa395848a120ac3e5b98e5 Mon Sep 17 00:00:00 2001
From: Yagiz Nizipli <yagiz@nizipli.com>
Date: Wed, 9 Nov 2022 09:18:42 -0500
Subject: [PATCH] util: improve text decoder performance

PR-URL: #45388
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Santiago Gimeno <santiago.gimeno@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
---
 lib/internal/encoding.js | 12 +-----------
 src/node_errors.h        |  1 +
 src/node_i18n.cc         | 24 ++++++++++++++++++------
 3 files changed, 20 insertions(+), 17 deletions(-)

diff --git a/lib/internal/encoding.js b/lib/internal/encoding.js
index 40c87a0a8719ff..66dc0ce9c8609a 100644
--- a/lib/internal/encoding.js
+++ b/lib/internal/encoding.js
@@ -18,7 +18,6 @@ const {
 } = primordials;
 
 const {
-  ERR_ENCODING_INVALID_ENCODED_DATA,
   ERR_ENCODING_NOT_SUPPORTED,
   ERR_INVALID_ARG_TYPE,
   ERR_INVALID_THIS,
@@ -411,11 +410,6 @@ function makeTextDecoderICU() {
 
     decode(input = empty, options = kEmptyObject) {
       validateDecoder(this);
-      if (!isAnyArrayBuffer(input) && !isArrayBufferView(input)) {
-        throw new ERR_INVALID_ARG_TYPE('input',
-                                       ['ArrayBuffer', 'ArrayBufferView'],
-                                       input);
-      }
       validateObject(options, 'options', {
         nullable: true,
         allowArray: true,
@@ -426,11 +420,7 @@ function makeTextDecoderICU() {
       if (options !== null)
         flags |= options.stream ? 0 : CONVERTER_FLAGS_FLUSH;
 
-      const ret = _decode(this[kHandle], input, flags);
-      if (typeof ret === 'number') {
-        throw new ERR_ENCODING_INVALID_ENCODED_DATA(this.encoding, ret);
-      }
-      return ret;
+      return _decode(this[kHandle], input, flags, this.encoding);
     }
   }
 
diff --git a/src/node_errors.h b/src/node_errors.h
index 68a95835812e50..706464acc87b5c 100644
--- a/src/node_errors.h
+++ b/src/node_errors.h
@@ -60,6 +60,7 @@ void OOMErrorHandler(const char* location, const v8::OOMDetails& details);
   V(ERR_CRYPTO_JOB_INIT_FAILED, Error)                                         \
   V(ERR_DLOPEN_DISABLED, Error)                                                \
   V(ERR_DLOPEN_FAILED, Error)                                                  \
+  V(ERR_ENCODING_INVALID_ENCODED_DATA, TypeError)                              \
   V(ERR_EXECUTION_ENVIRONMENT_NOT_AVAILABLE, Error)                            \
   V(ERR_INVALID_ADDRESS, Error)                                                \
   V(ERR_INVALID_ARG_VALUE, TypeError)                                          \
diff --git a/src/node_i18n.cc b/src/node_i18n.cc
index ed7b72c31f975e..441c2b32763a96 100644
--- a/src/node_i18n.cc
+++ b/src/node_i18n.cc
@@ -436,13 +436,25 @@ void ConverterObject::Create(const FunctionCallbackInfo<Value>& args) {
 void ConverterObject::Decode(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args);
 
-  CHECK_GE(args.Length(), 3);  // Converter, Buffer, Flags
+  CHECK_GE(args.Length(), 4);  // Converter, Buffer, Flags, Encoding
 
   ConverterObject* converter;
   ASSIGN_OR_RETURN_UNWRAP(&converter, args[0].As<Object>());
+
+  if (!(args[1]->IsArrayBuffer() || args[1]->IsSharedArrayBuffer() ||
+        args[1]->IsArrayBufferView())) {
+    return node::THROW_ERR_INVALID_ARG_TYPE(
+        env->isolate(),
+        "The \"input\" argument must be an instance of SharedArrayBuffer, "
+        "ArrayBuffer or ArrayBufferView.");
+  }
+
   ArrayBufferViewContents<char> input(args[1]);
   int flags = args[2]->Uint32Value(env->context()).ToChecked();
 
+  CHECK(args[3]->IsString());
+  Local<String> from_encoding = args[3].As<String>();
+
   UErrorCode status = U_ZERO_ERROR;
   MaybeStackBuffer<UChar> result;
 
@@ -524,14 +536,14 @@ void ConverterObject::Decode(const FunctionCallbackInfo<Value>& args) {
     Local<Value> ret;
     if (encoded.ToLocal(&ret)) {
       args.GetReturnValue().Set(ret);
-    } else {
-      args.GetReturnValue().Set(error);
+      return;
     }
-
-    return;
   }
 
-  args.GetReturnValue().Set(status);
+  node::THROW_ERR_ENCODING_INVALID_ENCODED_DATA(
+      env->isolate(),
+      "The encoded data was not valid for encoding %s",
+      *node::Utf8Value(env->isolate(), from_encoding));
 }
 
 ConverterObject::ConverterObject(