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#include "cbor_decoder.hpp"
#include <cstdint>
#include <string>
#include "cbor.h"
#include "result.hpp"
static const int kDecoderFlags = 0;
namespace cbor {
auto parse_stdstring(const CborValue* val, std::string* out) -> CborError {
char* buf;
size_t len;
CborError err = cbor_value_dup_text_string(val, &buf, &len, NULL);
if (err != CborNoError) {
return err;
}
*out = std::string(buf, len);
free(buf);
return err;
}
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, kDecoderFlags, &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::Create(CborValue& root)
-> cpp::result<std::unique_ptr<ArrayDecoder>, CborError> {
auto decoder = std::make_unique<ArrayDecoder>();
decoder->root_ = 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);
}
template <>
auto ArrayDecoder::NextValue() -> cpp::result<int64_t, CborError> {
return NextValue(&cbor_value_is_integer, &cbor_value_get_int);
}
template <>
auto ArrayDecoder::NextValue() -> cpp::result<uint64_t, CborError> {
return NextValue(&cbor_value_is_unsigned_integer, &cbor_value_get_uint64);
}
template <>
auto ArrayDecoder::NextValue() -> cpp::result<std::string, CborError> {
return NextValue(&cbor_value_is_byte_string, &parse_stdstring);
}
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, kDecoderFlags, &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::Create(CborValue& root)
-> cpp::result<std::unique_ptr<MapDecoder>, CborError> {
auto decoder = std::make_unique<MapDecoder>();
decoder->root_ = 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);
}
template <>
auto MapDecoder::FindValue(const std::string& key) -> std::optional<int64_t> {
return FindValue(key, &cbor_value_is_integer, &cbor_value_get_int);
}
template <>
auto MapDecoder::FindValue(const std::string& key) -> std::optional<uint64_t> {
return FindValue(key, &cbor_value_is_unsigned_integer,
&cbor_value_get_uint64);
}
template <>
auto MapDecoder::FindValue(const std::string& key)
-> std::optional<std::string> {
return FindValue(key, &cbor_value_is_byte_string, &parse_stdstring);
}
} // namespace cbor
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