Make compatible with node-14 (and more?)

Author: RealDolos

src/binding.cpp

@@ -16,15 +16,15 @@ union any_blake2_state {
 };
 
 #define BLAKE_FN_CAST(fn) \
-	reinterpret_cast<uintptr_t (*)(void*, const uint8_t*, uint64_t)>(fn)
+	((int (*)(void*, const uint8_t*, uint64_t))fn)
 
 static Nan::Persistent<v8::FunctionTemplate> hash_constructor;
 
 class Hash: public Nan::ObjectWrap {
 protected:
 	bool initialized_;
-	uintptr_t (*any_blake2_update)(void*, const uint8_t*, uint64_t);
-	uintptr_t (*any_blake2_final)(void*, const uint8_t*, uint64_t);
+	int (*any_blake2_update)(void*, const uint8_t*, uint64_t);
+	int (*any_blake2_final)(void*, const uint8_t*, uint64_t);
 	uint8_t outbytes;
 	any_blake2_state state;
 
@@ -40,7 +40,7 @@ class Hash: public Nan::ObjectWrap {
 		Nan::SetPrototypeMethod(tpl, "copy", Copy);
 		Nan::SetPrototypeMethod(tpl, "saveState", SaveState);
 		Nan::SetPrototypeMethod(tpl, "restoreState", RestoreState);
-		target->Set(Nan::New("Hash").ToLocalChecked(), tpl->GetFunction());
+		Nan::Set(target, Nan::New("Hash").ToLocalChecked(), Nan::GetFunction(tpl).ToLocalChecked());
 	}
 
 	static
@@ -70,10 +70,11 @@ class Hash: public Nan::ObjectWrap {
 			}
 
 			if (info.Length() >= 3) {
-				if (!info[2]->IsNumber()) {
+				v8::Local<v8::Int32> dl;
+				if (!info[2]->IsNumber() || !Nan::To<v8::Int32>(info[2]).ToLocal(&dl)) {
 					return Nan::ThrowError(v8::Exception::TypeError(Nan::New<v8::String>("digestLength must be a number").ToLocalChecked()));
 				}
-				digest_length = info[2]->IntegerValue();
+				digest_length = dl->Value();
 			}
 		}
 
@@ -190,7 +191,10 @@ class Hash: public Nan::ObjectWrap {
 			return Nan::ThrowError(v8::Exception::TypeError(Nan::New<v8::String>("Bad argument; need a Buffer").ToLocalChecked()));
 		}
 
-		v8::Local<v8::Object> buffer_obj = info[0]->ToObject();
+		v8::Local<v8::Object> buffer_obj;
+		if (!Nan::To<v8::Object>(info[0]).ToLocal(&buffer_obj)) {
+			return Nan::ThrowError(v8::Exception::TypeError(Nan::New<v8::String>("Bad argument; need a Buffer").ToLocalChecked()));
+		}
 		const char *buffer_data = node::Buffer::Data(buffer_obj);
 		size_t buffer_length = node::Buffer::Length(buffer_obj);
 		obj->any_blake2_update(
@@ -284,7 +288,10 @@ class Hash: public Nan::ObjectWrap {
 			return Nan::ThrowError(v8::Exception::TypeError(Nan::New<v8::String>("Bad argument; need a Buffer").ToLocalChecked()));
 		}
 
-		auto buffer_obj = info[0]->ToObject();
+		v8::Local<v8::Object> buffer_obj;
+		if (!Nan::To<v8::Object>(info[0]).ToLocal(&buffer_obj)) {
+			return Nan::ThrowError(v8::Exception::TypeError(Nan::New<v8::String>("Bad argument; need a Buffer").ToLocalChecked()));
+		}
 		const auto buffer_data = node::Buffer::Data(buffer_obj);
 		const auto buffer_length = node::Buffer::Length(buffer_obj);
 		if (buffer_length != sizeof(any_blake2_state)) {