util: add fast path for Latin1 decoding

Author: Mert Can Altin

deps/v8/test/unittests/heap/encoding_binding_test.cc

@@ -0,0 +1,73 @@
+#include "encoding_binding.h"
+#include "node_test_fixture.h"
+#include "env-inl.h"
+#include "v8.h"
+#include "gtest/gtest.h"
+
+namespace node {
+namespace encoding_binding {
+
+bool RunDecodeLatin1(Environment* env, Local<Value> args[], Local<Value>* result) {
+  Isolate* isolate = env->isolate();
+  TryCatch try_catch(isolate);
+
+  BindingData::DecodeLatin1(FunctionCallbackInfo<Value>(args));
+
+  if (try_catch.HasCaught()) {
+    return false;
+  }
+
+  *result = try_catch.Exception();
+  return true;
+}
+
+class EncodingBindingTest : public NodeTestFixture {};
+
+TEST_F(EncodingBindingTest, DecodeLatin1_ValidInput) {
+  Environment* env = CreateEnvironment();
+  Isolate* isolate = env->isolate();
+  HandleScope handle_scope(isolate);
+
+  const uint8_t latin1_data[] = {0xC1, 0xE9, 0xF3};
+  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, sizeof(latin1_data));
+  memcpy(ab->GetBackingStore()->Data(), latin1_data, sizeof(latin1_data));
+
+  Local<Uint8Array> array = Uint8Array::New(ab, 0, sizeof(latin1_data));
+  Local<Value> args[] = { array };
+
+  Local<Value> result;
+  EXPECT_TRUE(RunDecodeLatin1(env, args, &result));
+
+  String::Utf8Value utf8_result(isolate, result);
+  EXPECT_STREQ(*utf8_result, "Áéó");
+}
+
+TEST_F(EncodingBindingTest, DecodeLatin1_EmptyInput) {
+  Environment* env = CreateEnvironment();
+  Isolate* isolate = env->isolate();
+  HandleScope handle_scope(isolate);
+
+  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, 0);
+  Local<Uint8Array> array = Uint8Array::New(ab, 0, 0);
+  Local<Value> args[] = { array };
+
+  Local<Value> result;
+  EXPECT_TRUE(RunDecodeLatin1(env, args, &result));
+
+  String::Utf8Value utf8_result(isolate, result);
+  EXPECT_STREQ(*utf8_result, "");
+}
+
+TEST_F(EncodingBindingTest, DecodeLatin1_InvalidInput) {
+  Environment* env = CreateEnvironment();
+  Isolate* isolate = env->isolate();
+  HandleScope handle_scope(isolate);
+
+  Local<Value> args[] = { String::NewFromUtf8Literal(isolate, "Invalid input") };
+
+  Local<Value> result;
+  EXPECT_FALSE(RunDecodeLatin1(env, args, &result));
+}
+
+}  // namespace encoding_binding
+}  // namespace node