std::string data;
  if (parser.parseString(&data)) {
    return nullptr;
  }
  if (data.size() < 2 || data.substr(0, 2) != "0x") {
    parser.emitError(parser.getNameLoc(), "Hex string doesn't start with `0x`");
    return nullptr;
  }

  std::string bytes_data = absl::HexStringToBytes(data.substr(2));
  return ConstBytesAttr::get(parser.getBuilder().getContext(), bytes_data);
}

  local -r prefix="${2:-}"
  local -r suffix="${3:-}"
  local -r dirname=$(dirname "${file}")
  local -r tmpfile=$(mktemp "${dirname}/filtered.XXXX")

  touch "${file}"
  awk -v pfx="${prefix}" 'substr($0,1,length(pfx)) != pfx { print }' "${file}" > "${tmpfile}"
  echo "${prefix}${suffix}" >> "${tmpfile}"
  mv "${tmpfile}" "${file}"
}

function write-pki-data {
  local data="${1}"
  local path="${2}"