Added support for custom reader classes

src/ArduinoJson/Deserialization/Readers/ArduinoStreamReader.hpp

@@ -0,0 +1,30 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#pragma once
+
+#include <Stream.h>
+
+namespace ARDUINOJSON_NAMESPACE {
+
+template <typename TSource>
+struct Reader<TSource,
+              typename enable_if<is_base_of<Stream, TSource>::value>::type> {
+  Stream& _stream;
+
+ public:
+  explicit Reader(Stream& stream) : _stream(stream) {}
+
+  int read() {
+    // don't use _stream.read() as it ignores the timeout
+    char c;
+    return _stream.readBytes(&c, 1) ? c : -1;
+  }
+
+  size_t readBytes(char* buffer, size_t length) {
+    return _stream.readBytes(buffer, length);
+  }
+};
+
+}  // namespace ARDUINOJSON_NAMESPACE