Reorganized writer classes

src/ArduinoJson/Serialization/Writers/ArduinoStringWriter.hpp

@@ -0,0 +1,36 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#pragma once
+
+#include <WString.h>
+
+namespace ARDUINOJSON_NAMESPACE {
+
+template <>
+class Writer< ::String, void> {
+ public:
+  explicit Writer(::String &str) : _str(&str) {}
+
+  size_t write(uint8_t c) {
+    _str->operator+=(static_cast<char>(c));
+    return 1;
+  }
+
+  size_t write(const uint8_t *s, size_t n) {
+    // CAUTION: Arduino String doesn't have append()
+    // and old version doesn't have size() either
+    _str->reserve(_str->length() + n);
+    while (n > 0) {
+      _str->operator+=(static_cast<char>(*s++));
+      n--;
+    }
+    return n;
+  }
+
+ private:
+  ::String *_str;
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE