Adding Cbor utility functions to decode string and byte array

Author: andreagilardoni

src/cbor/utils/decoder.h

@@ -0,0 +1,40 @@
+/*
+    This file is part of the Arduino_CloudUtils library.
+
+    Copyright (c) 2024 Arduino SA
+
+    This Source Code Form is subject to the terms of the Mozilla Public
+    License, v. 2.0. If a copy of the MPL was not distributed with this
+    file, You can obtain one at http://mozilla.org/MPL/2.0/.
+*/
+#pragma once
+#include "../tinycbor/cbor-lib.h"
+
+namespace cbor { namespace utils {
+
+  inline MessageDecoder::Status copyCBORStringToArray(CborValue * param, char * dest, size_t& dest_size) {
+    if (!cbor_value_is_text_string(param)) {
+      return MessageDecoder::Status::Error;
+    }
+
+    // NOTE: keep in mind that _cbor_value_copy_string tries to put a \0 at the end of the string
+    if(_cbor_value_copy_string(param, dest, &dest_size, NULL) != CborNoError) {
+      return MessageDecoder::Status::Error;
+    }
+
+    return MessageDecoder::Status::InProgress;
+  }
+
+  inline MessageDecoder::Status copyCBORByteToArray(CborValue * param, uint8_t * dest, size_t& dest_size) {
+    if (!cbor_value_is_byte_string(param)) {
+      return MessageDecoder::Status::Error;
+    }
+
+    // NOTE: keep in mind that _cbor_value_copy_string tries to put a \0 at the end of the string
+    if(_cbor_value_copy_string(param, dest, &dest_size, NULL) != CborNoError) {
+      return MessageDecoder::Status::Error;
+    }
+
+    return MessageDecoder::Status::InProgress;
+  }
+}}