Function parse_event_entry

tee/cocoon/tdx/eventlog.cpp:245–282

}

static td::Result<size_t> parse_event_entry(td::Slice data, const EventLog& log, EventLogEntry& entry) {
  auto orig = data;

  TRY_RESULT(reg_index, cut<uint32_t>(data));
  entry.rtmr_index = reg_index > 0 ? reg_index - 1 : 0;

  TRY_RESULT(event_type, cut<uint32_t>(data));
  entry.event_type = event_type;

  TRY_RESULT(digest_count, cut<uint32_t>(data));

  for (uint32_t i = 0; i < digest_count; i++) {
    TRY_RESULT(alg_id, cut<uint16_t>(data));

    auto it = log.digest_sizes.find(alg_id);
    size_t digest_size = it != log.digest_sizes.end() ? it->second : AlgorithmId::digest_size(alg_id);
    if (digest_size == 0) {
      return td::Status::Error("Unknown algorithm");
    }

    TRY_RESULT(digest, cut_bytes(data, digest_size));

    if (entry.digest_raw.empty()) {
      entry.algorithm_id = alg_id;
      entry.digest_raw = digest.str();
      entry.digest_hex = td::buffer_to_hex(digest);
    }
  }

  TRY_RESULT(event_size, cut<uint32_t>(data));
  TRY_RESULT(event_data, cut_bytes(data, event_size));
  entry.event_data = event_data.str();

  entry.length = orig.size() - data.size();
  entry.raw_data = orig.substr(0, entry.length).str();

  return entry.length;
}

// ============================================================================
// EventLog Methods