41 lines
1.2 KiB
C++
41 lines
1.2 KiB
C++
#ifndef FINGERPRINT_H
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#define FINGERPRINT_H
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#include <array>
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#include <boost/uuid/uuid.hpp>
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#include <cstdint>
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#include <type_traits>
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namespace osrm::util
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{
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// implements a singleton, i.e. there is one and only one conviguration object
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struct FingerPrint
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{
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static FingerPrint GetValid();
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bool IsValid() const;
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bool IsDataCompatible(const FingerPrint &other) const;
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int GetMajorVersion() const;
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int GetMinorVersion() const;
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int GetPatchVersion() const;
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private:
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std::uint8_t CalculateChecksum() const;
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// Here using std::array so that == can be used to conveniently compare contents
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std::array<std::uint8_t, 4> magic_number;
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std::uint8_t major_version;
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std::uint8_t minor_version;
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std::uint8_t patch_version;
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std::uint8_t checksum; // CRC8 of the previous bytes to ensure the fingerprint is not damaged
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};
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static_assert(sizeof(FingerPrint) == 8, "FingerPrint has unexpected size");
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static_assert(std::is_trivial<FingerPrint>::value, "FingerPrint needs to be trivial.");
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static_assert(std::is_standard_layout<FingerPrint>::value,
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"FingerPrint needs have a standard layout.");
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} // namespace osrm::util
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#endif /* FingerPrint_H */
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