absl::Status GetProviderProperty()

in kmscng/main/bridge.cc [87:132]
40 lines of code
5 McCabe index (conditional complexity)

absl::Status GetProviderProperty(__in NCRYPT_PROV_HANDLE hProvider,
                                 __in LPCWSTR pszProperty,
                                 __out_bcount_part_opt(cbOutput, *pcbResult)
                                     PBYTE pbOutput,
                                 __in DWORD cbOutput, __out DWORD* pcbResult,
                                 __in DWORD dwFlags) {
  LOG_IF(INFO, std::getenv(kVerboseLoggingEnvVariable))
      << "GetProviderProperty invoked\n"
      << "Provider: " << hProvider << "\n"
      << "Property name: " << WideToString(std::wstring(pszProperty)) << "\n"
      << "Output: " << uintptr_t(pbOutput) << "\n"
      << "Output size: " << cbOutput << "\n"
      << "Output result size: " << uintptr_t(pcbResult) << "\n"
      << "Flags: " << dwFlags << "\n\n";
  ASSIGN_OR_RETURN(Provider * prov, ValidateProviderHandle(hProvider));
  if (!pszProperty) {
    return NewInvalidArgumentError("pszProperty cannot be null",
                                   NTE_INVALID_PARAMETER, SOURCE_LOCATION);
  }
  if (!pcbResult) {
    return NewInvalidArgumentError("pcbResult cannot be null",
                                   NTE_INVALID_PARAMETER, SOURCE_LOCATION);
  }
  RETURN_IF_ERROR(ValidateFlags(dwFlags));

  ASSIGN_OR_RETURN(std::string_view property_value,
                   prov->GetProperty(pszProperty));
  *pcbResult = property_value.size();

  // Return size required to hold the property value if output buffer is null.
  if (!pbOutput) {
    return absl::OkStatus();
  }

  // Check provided buffer size to ensure the property value fits.
  if (cbOutput < property_value.size()) {
    return NewOutOfRangeError(
        absl::StrFormat("cbOutput size=%u not large enough to fit "
                        "property value of size %u",
                        cbOutput, property_value.size()),
        SOURCE_LOCATION);
  }

  property_value.copy(reinterpret_cast<char*>(pbOutput), property_value.size());
  return absl::OkStatus();
}