Add initial NVS Arduino implementation

libraries/ESP32NVS/src/ESP32NVS.h

@@ -0,0 +1,57 @@
+// Copyright 2015-2016 Espressif Systems (Shanghai) PTE LTD
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef _ESP32NVS_H_
+#define _ESP32NVS_H_
+
+#include "Arduino.h"
+
+class NVSClass {
+    protected:
+        uint32_t _handle;
+        bool _started;
+        bool _readOnly;
+    public:
+        NVSClass();
+        ~NVSClass();
+
+        bool begin(const char * name, bool readOnly=false);
+        void end();
+
+        bool erase();
+        bool erase(const char * key);
+
+        size_t writeChar(const char* key, int8_t value);
+        size_t writeUChar(const char* key, uint8_t value);
+        size_t writeShort(const char* key, int16_t value);
+        size_t writeUShort(const char* key, uint16_t value);
+        size_t writeInt(const char* key, int32_t value);
+        size_t writeUInt(const char* key, uint32_t value);
+        size_t writeLong(const char* key, int64_t value);
+        size_t writeULong(const char* key, uint64_t value);
+        size_t writeString(const char* key, const char* value);
+        size_t writeBytes(const char* key, const void* value, size_t len);
+
+        int8_t readChar(const char* key);
+        uint8_t readUChar(const char* key);
+        int16_t readShort(const char* key);
+        uint16_t readUShort(const char* key);
+        int32_t readInt(const char* key);
+        uint32_t readUInt(const char* key);
+        int64_t readLong(const char* key);
+        uint64_t readULong(const char* key);
+        String readString(const char* key);
+        size_t readBytes(const char* key, void * buf, size_t maxLen);
+};
+
+#endif