Added serializeMsgPack() and measureMsgPack() (closes #358)

src/ArduinoJson/Serialization/DynamicStringBuilder.hpp

@@ -0,0 +1,35 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include "../Strings/StringTraits.hpp"
+
+namespace ArduinoJson {
+namespace Internals {
+
+// A Print implementation that allows to write in a String
+template <typename TString>
+class DynamicStringBuilder {
+ public:
+  DynamicStringBuilder(TString &str) : _str(str) {}
+
+  size_t print(char c) {
+    StringTraits<TString>::append(_str, c);
+    return 1;
+  }
+
+  size_t print(const char *s) {
+    size_t initialLen = _str.length();
+    StringTraits<TString>::append(_str, s);
+    return _str.length() - initialLen;
+  }
+
+ private:
+  DynamicStringBuilder &operator=(const DynamicStringBuilder &);
+
+  TString &_str;
+};
+}  // namespace Internals
+}  // namespace ArduinoJson