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// Copyright (C) 2022 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef ICING_UTIL_FINGERPRINT_UTIL_H_
#define ICING_UTIL_FINGERPRINT_UTIL_H_
#include <cstdint>
#include <string>
#include <string_view>
namespace icing {
namespace lib {
namespace fingerprint_util {
// Converts from a fingerprint to a fingerprint string.
std::string GetFingerprintString(uint64_t fingerprint);
// Converts from a fingerprint string to a fingerprint.
uint64_t GetFingerprint(std::string_view fingerprint_string);
// A formatter to properly handle a string that is actually just a hash value.
class FingerprintStringFormatter {
public:
std::string operator()(std::string_view fingerprint_string) {
uint64_t fingerprint = GetFingerprint(fingerprint_string);
return std::to_string(fingerprint);
}
};
} // namespace fingerprint_util
} // namespace lib
} // namespace icing
#endif // ICING_UTIL_FINGERPRINT_UTIL_H_
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