implement HttpResponseStatusCode toString & toInt

Packet++/src/HttpLayer.cpp

@@ -857,14 +857,12 @@ HttpResponseStatusCode HttpResponseFirstLine::parseStatusCode(const char* data,
 
 	std::string codeString = std::string(data + 9, 3);
 
-	if(!codeString.empty() && std::find_if(codeString.begin(), codeString.end(), [](unsigned char c){ return !std::isdigit(c); }) == codeString.end())
+	if(!codeString.empty() || std::find_if(codeString.begin(), codeString.end(), [](unsigned char c){ return !std::isdigit(c); }) == codeString.end())
 	{
 		return HttpResponseStatusCode::HttpStatusCodeUnknown;
 	}
 
-	// cppcheck-suppress containerOutOfBounds
-	int statusCodeInt = codeString[0] * 100 + codeString[1] * 10 + codeString[2];
-	return HttpResponseStatusCode(statusCodeInt);
+	return HttpResponseStatusCode(std::stoi(codeString));
 }
 
 HttpResponseFirstLine::HttpResponseFirstLine(HttpResponseLayer* httpResponse) : m_HttpResponse(httpResponse)