Revert "util: add fast path for Latin1 decoding"

This reverts commit 20bcaa0.

Author: ChALkeR

benchmark/util/text-decoder.js

@@ -3,7 +3,7 @@
 const common = require('../common.js');
 
 const bench = common.createBenchmark(main, {
-  encoding: ['utf-8', 'windows-1252', 'iso-8859-3'],
+  encoding: ['utf-8', 'latin1', 'iso-8859-3'],
   ignoreBOM: [0, 1],
   fatal: [0, 1],
   len: [256, 1024 * 16, 1024 * 128],

lib/internal/encoding.js

@@ -28,7 +28,6 @@ const kEncoding = Symbol('encoding');
 const kDecoder = Symbol('decoder');
 const kFatal = Symbol('kFatal');
 const kUTF8FastPath = Symbol('kUTF8FastPath');
-const kLatin1FastPath = Symbol('kLatin1FastPath');
 const kIgnoreBOM = Symbol('kIgnoreBOM');
 
 const {
@@ -55,7 +54,6 @@ const {
   encodeIntoResults,
   encodeUtf8String,
   decodeUTF8,
-  decodeLatin1,
 } = binding;
 
 const { Buffer } = require('buffer');
@@ -420,10 +418,9 @@ function makeTextDecoderICU() {
       this[kFatal] = Boolean(options?.fatal);
       // Only support fast path for UTF-8.
       this[kUTF8FastPath] = enc === 'utf-8';
-      this[kLatin1FastPath] = enc === 'windows-1252';
       this[kHandle] = undefined;
 
-      if (!this[kUTF8FastPath] && !this[kLatin1FastPath]) {
+      if (!this[kUTF8FastPath]) {
         this.#prepareConverter();
       }
     }
@@ -440,16 +437,11 @@ function makeTextDecoderICU() {
       validateDecoder(this);
 
       this[kUTF8FastPath] &&= !(options?.stream);
-      this[kLatin1FastPath] &&= !(options?.stream);
 
       if (this[kUTF8FastPath]) {
         return decodeUTF8(input, this[kIgnoreBOM], this[kFatal]);
       }
 
-      if (this[kLatin1FastPath]) {
-        return decodeLatin1(input, this[kIgnoreBOM], this[kFatal]);
-      }
-
       this.#prepareConverter();
 
       validateObject(options, 'options', kValidateObjectAllowObjectsAndNull);

src/encoding_binding.cc

@@ -1,7 +1,6 @@
 #include "encoding_binding.h"
 #include "ada.h"
 #include "env-inl.h"
-#include "node_buffer.h"
 #include "node_errors.h"
 #include "node_external_reference.h"
 #include "simdutf.h"
@@ -221,7 +220,6 @@ void BindingData::CreatePerIsolateProperties(IsolateData* isolate_data,
   SetMethodNoSideEffect(isolate, target, "decodeUTF8", DecodeUTF8);
   SetMethodNoSideEffect(isolate, target, "toASCII", ToASCII);
   SetMethodNoSideEffect(isolate, target, "toUnicode", ToUnicode);
-  SetMethodNoSideEffect(isolate, target, "decodeLatin1", DecodeLatin1);
 }
 
 void BindingData::CreatePerContextProperties(Local<Object> target,
@@ -239,53 +237,6 @@ void BindingData::RegisterTimerExternalReferences(
   registry->Register(DecodeUTF8);
   registry->Register(ToASCII);
   registry->Register(ToUnicode);
-  registry->Register(DecodeLatin1);
-}
-
-void BindingData::DecodeLatin1(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args);
-
-  CHECK_GE(args.Length(), 1);
-  if (!(args[0]->IsArrayBuffer() || args[0]->IsSharedArrayBuffer() ||
-        args[0]->IsArrayBufferView())) {
-    return node::THROW_ERR_INVALID_ARG_TYPE(
-        env->isolate(),
-        "The \"input\" argument must be an instance of ArrayBuffer, "
-        "SharedArrayBuffer, or ArrayBufferView.");
-  }
-
-  bool ignore_bom = args[1]->IsTrue();
-  bool has_fatal = args[2]->IsTrue();
-
-  ArrayBufferViewContents<uint8_t> buffer(args[0]);
-  const uint8_t* data = buffer.data();
-  size_t length = buffer.length();
-
-  if (ignore_bom && length > 0 && data[0] == 0xFF) {
-    data++;
-    length--;
-  }
-
-  if (length == 0) {
-    return args.GetReturnValue().SetEmptyString();
-  }
-
-  std::string result(length * 2, '\0');
-
-  size_t written = simdutf::convert_latin1_to_utf8(
-      reinterpret_cast<const char*>(data), length, result.data());
-
-  if (has_fatal && written == 0) {
-    return node::THROW_ERR_ENCODING_INVALID_ENCODED_DATA(
-        env->isolate(), "The encoded data was not valid for encoding latin1");
-  }
-
-  std::string_view view(result.c_str(), written);
-
-  Local<Value> ret;
-  if (ToV8Value(env->context(), view, env->isolate()).ToLocal(&ret)) {
-    args.GetReturnValue().Set(ret);
-  }
 }
 
 }  // namespace encoding_binding

src/encoding_binding.h

@@ -31,7 +31,6 @@ class BindingData : public SnapshotableObject {
   static void EncodeInto(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void EncodeUtf8String(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void DecodeUTF8(const v8::FunctionCallbackInfo<v8::Value>& args);
-  static void DecodeLatin1(const v8::FunctionCallbackInfo<v8::Value>& args);
 
   static void ToASCII(const v8::FunctionCallbackInfo<v8::Value>& args);
   static void ToUnicode(const v8::FunctionCallbackInfo<v8::Value>& args);