From 9176ef187227ffb56c249c5f321cd1bf50d4cfcc Mon Sep 17 00:00:00 2001
From: jacqueline <me@jacqueline.id.au>
Date: Tue, 22 Nov 2022 17:05:02 +1100
Subject: Add cbor wrapper, and chunk streaming util

---
 src/cbor/cbor_decoder.cpp | 158 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 158 insertions(+)
 create mode 100644 src/cbor/cbor_decoder.cpp

(limited to 'src/cbor/cbor_decoder.cpp')

diff --git a/src/cbor/cbor_decoder.cpp b/src/cbor/cbor_decoder.cpp
new file mode 100644
index 00000000..eb43e163
--- /dev/null
+++ b/src/cbor/cbor_decoder.cpp
@@ -0,0 +1,158 @@
+#include "cbor_decoder.hpp"
+#include <cstdint>
+#include "esp-idf/components/cbor/tinycbor/src/cbor.h"
+#include "include/cbor_decoder.hpp"
+
+namespace cbor {
+
+static auto ArrayDecoder::Create(uint8_t *buffer, size_t buffer_len) -> cpp::result<std::unique_ptr<ArrayDecoder>, CborError> {
+  auto decoder = std::make_unique<ArrayDecoder>();
+  cbor_parser_init(buffer, buffer_len, &decoder->parser_, &decoder->root_);
+  if (!cbor_value_is_array(&decoder->root_)) {
+    return cpp::fail(CborErrorIllegalType);
+  }
+  CborError err = cbor_value_enter_container(&decoder->root_, &decoder->it_);
+  if (err != CborNoError) {
+    return cpp::fail(err);
+  }
+  return std::move(decoder);
+}
+
+
+auto ArrayDecoder::ParseString() -> cpp::result<std::string, CborError> {
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+
+  if (!cbor_value_is_byte_string(&it_)) {
+    error_ = CborErrorIllegalType;
+    return cpp::fail(error_);
+  }
+  uint8_t *buf; size_t len; CborValue new_val;
+  error_ = cbor_value_dup_byte_string(&it_, &buf, &len, &new_val);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  std::string ret(buf, len);
+  free(buf);
+  val_ = new_val;
+  return ret;
+}
+
+auto ArrayDecoder::ParseUnsigned() -> cpp::result<uint32_t, CborError> {
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+
+  if (!cbor_value_is_unsigned_integer(&it_)) {
+    error_ = CborErrorIllegalType;
+    return cpp::fail(error_);
+  }
+  uint64_t ret;
+  error_ = cbor_value_get_uint64(&it_, &ret);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  error_ = cbor_value_advance(&it_);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  return ret;
+}
+
+auto ArrayDecoder::ParseSigned() -> cpp::result<int32_t, CborError> {
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  if (!cbor_value_is_unsigned_integer(&it_)) {
+    error_ = CborErrorIllegalType;
+    return cpp::fail(error_);
+  }
+  uint64_t ret;
+  error_ = cbor_value_get_uint64(&it_, &ret);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  error_ = cbor_value_advance(&it_);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  return ret;
+}
+
+static auto MapDecoder::Create(uint8_t *buffer, size_t buffer_len) -> cpp::result<std::unique_ptr<MapDecoder>, CborError> {
+  auto decoder = std::make_unique<MapDecoder>();
+  cbor_parser_init(buffer, buffer_len, &decoder->parser_, &decoder->root_);
+  if (!cbor_value_is_map(&decoder->root_)) {
+    return cpp::fail(CborErrorIllegalType);
+  }
+  CborError err = cbor_value_enter_container(&decoder->root_, &decoder->it_);
+  if (err != CborNoError) {
+    return cpp::fail(err);
+  }
+  return std::move(decoder);
+}
+
+auto MapDecoder::FindString(const std::string &key) -> std::optional<std::string> {
+  CborValue val;
+  if (error_ != CborNoError) {
+    return {};
+  }
+  if (cbor_value_map_find_value(&it_, key.c_str(), &val) != CborNoError) {
+    return {};
+  }
+  if (!cbor_value_is_byte_string(&val)) {
+    error_ = CborErrorIllegalType;
+    return {};
+  }
+  uint8_t *buf; size_t len;
+  error_ = cbor_value_dup_byte_string(&val, &buf, &len, NULL);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  std::string ret(buf, len);
+  free(buf);
+  return ret;
+}
+
+auto MapDecoder::FindUnsigned(const std::string &key) -> std::optional<uint32_t> {
+  CborValue val;
+  if (error_ != CborNoError) {
+    return {};
+  }
+  if (cbor_value_map_find_value(&it_, key.c_str(), &val) != CborNoError) {
+    return {};
+  }
+  if (!cbor_value_is_unsigned_integer(&val)) {
+    error_ = CborErrorIllegalType;
+    return {};
+  }
+  uint64_t ret;
+  error_ = cbor_value_get_uint64(&val, &ret);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  return ret;
+}
+
+auto MapDecoder::FindSigned(const std::string &key) -> std::optional<int32_t> {
+  CborValue val;
+  if (error_ != CborNoError) {
+    return {};
+  }
+  if (cbor_value_map_find_value(&it_, key.c_str(), &val) != CborNoError) {
+    return {};
+  }
+  if (!cbor_value_is_integer(&val)) {
+    error_ = CborErrorIllegalType;
+    return {};
+  }
+  int32_t ret;
+  error_ = cbor_value_get_int(&val, &ret);
+  if (error_ != CborNoError) {
+    return cpp::fail(error_);
+  }
+  return ret;
+}
+
+} // namespace cbor
-- 
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