Add cbor wrapper, and chunk streaming util

1 files changed, 53 insertions, 0 deletions

diff --git a/src/cbor/cbor_encoder.cpp b/src/cbor/cbor_encoder.cpp
new file mode 100644
index 00000000..863597b4
--- /dev/null
+++ b/src/cbor/cbor_encoder.cpp
@@ -0,0 +1,53 @@
+#include "cbor_encoder.hpp"
+#include <cstdint>
+#include "esp-idf/components/cbor/tinycbor/src/cbor.h"
+
+namespace cbor {
+
+  static const int kEncoderFlags = 0;
+
+Encoder::Encoder(ContainerType type, uint32_t container_len, uint8_t *buffer, size_t buffer_len) {
+  cbor_encoder_init(&root_encoder, buffer, buffer_len, kEncoderFlags);
+  switch (type) {
+    case CONTAINER_ARRAY:
+      error_ = cbor_encoder_create_array(&encoder, &container_encoder_, container_len);
+      break;
+    case CONTAINER_MAP:
+      error_ = cbor_encoder_create_map(&encoder, &container_encoder_, container_len);
+      break;
+  }
+}
+
+auto Encoder::WriteString(const std::string &val) -> void {
+  if (error_ != CborNoError) {
+    return;
+  }
+  error_ = cbor_encode_byte_string(&container_encoder_, val.c_str(), val.size());
+}
+
+auto Encoder::WriteUnsigned(uint32_t val) -> void {
+  if (error_ != CborNoError) {
+    return;
+  }
+  error_ = cbor_encode_uint(&container_encoder_, val);
+}
+
+auto Encoder::WriteSigned(int32_t val) -> void {
+  if (error_ != CborNoError) {
+    return;
+  }
+  error_ = cbor_encode_int(&container_encoder_, val);
+}
+
+auto Encoder::Finish() -> cpp::result<size_t, CborError> {
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  if (CborError final_error = cbor_encoder_close_container(&root_encoder, &container_encoder_) != CborNoError) {
+    return cpp::fail(final_error);
+  }
+  return cbor_encoder_get_buffer_size(&root_encoder);
+}
+
+} // namespace cbor
+