Add cbor wrapper, and chunk streaming util

2 files changed, 77 insertions, 0 deletions

diff --git a/src/cbor/include/cbor_decoder.hpp b/src/cbor/include/cbor_decoder.hpp
new file mode 100644
index 00000000..249db9cc
--- /dev/null
+++ b/src/cbor/include/cbor_decoder.hpp
@@ -0,0 +1,47 @@
+#pragma once
+
+#include <cstdint>
+namespace cbor {
+
+  class ArrayDecoder {
+    public:
+      static auto Create(uint8_t *buffer, size_t buffer_len) -> cpp::result<std::unique_ptr<ArrayDecoder>, CborError>;
+
+      auto ParseString() -> cpp::result<std::string, CborError>;
+      auto ParseUnsigned() -> cpp::result<uint32_t, CborError>;
+      auto ParseSigned() -> cpp::result<int32_t, CborError>;
+
+      auto Failed() -> CborError { return error_; }
+
+      ArrayDecoder(const ArrayDecoder&) = delete;
+      ArrayDecoder& operator=(const ArrayDecoder&) = delete;
+    private:
+      CborParser parser_;
+      CborValue root_;
+
+      CborValue it_;
+      CborError error_ = CborNoError;
+  };
+
+  class MapDecoder {
+    public:
+      static auto Create(uint8_t *buffer, size_t buffer_len) -> cpp::result<std::unique_ptr<MapDecoder>, CborError>;
+
+      auto FindString(const std::string &key) -> std::optional<std::string>;
+      auto FindUnsigned(const std::string &key) -> std::optional<uint32_t>;
+      auto FindSigned(const std::string &key) -> std::optional<int32_t>;
+
+      auto Failed() -> CborError { return error_; }
+
+      MapDecoder(const MapDecoder&) = delete;
+      MapDecoder& operator=(const MapDecoder&) = delete;
+    private:
+      CborParser parser_;
+      CborValue root_;
+
+      CborValue it_;
+      CborError error_ = CborNoError;
+  };
+
+
+} // namespace cbor
diff --git a/src/cbor/include/cbor_encoder.hpp b/src/cbor/include/cbor_encoder.hpp
new file mode 100644
index 00000000..0edbbdff
--- /dev/null
+++ b/src/cbor/include/cbor_encoder.hpp
@@ -0,0 +1,30 @@
+#pragma once
+
+#include <cstdint>
+#include "esp-idf/components/cbor/tinycbor/src/cbor.h"
+namespace cbor {
+
+  class Encoder {
+    public:
+      enum ContainerType {
+        CONTAINER_ARRAY,
+        CONTAINER_MAP
+      };
+      Encoder(ContainerType type, uint32_t container_len, uint8_t *buffer, size_t buffer_len);
+
+      auto WriteString(const std::string &val) -> void;
+      auto WriteUnsigned(uint32_t val) -> void;
+      auto WriteSigned(int32_t val) -> void;
+
+      auto Finish() -> cpp::result<size_t, CborError>;
+
+      Encoder(const Encoder&) = delete;
+      Encoder& operator=(const Encoder&) = delete;
+    private:
+      CborEncoder root_encoder_;
+      CborEncoder container_encoder_;
+
+      CborError error_ = CborNoError;
+  };
+
+} // namespace cbor