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/** |
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* This file is part of the CernVM File System. |
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*/ |
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#ifndef CVMFS_UTIL_UUID_H_ |
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#define CVMFS_UTIL_UUID_H_ |
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#include <inttypes.h> |
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#include <uuid/uuid.h> |
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#include <cstdint> |
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#include <string> |
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#include "util/export.h" |
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namespace cvmfs { |
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/** |
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* Holds a unique identifies which is either read from a file or, if the file |
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* does not yet exist, created and stored in a file. This is how it is used to |
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* identify a cvmfs cache directory. |
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* |
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* In order to create many UUIDs for short-lived objects, use the CreateOneTime |
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* factory method. |
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*/ |
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class CVMFS_EXPORT Uuid { |
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public: |
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static Uuid *Create(const std::string &store_path); |
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static std::string CreateOneTime(); |
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std::string uuid() const { return uuid_; } |
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const unsigned char *data() const { |
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return reinterpret_cast<const unsigned char *>(&uuid_presentation_.uuid); |
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} |
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unsigned size() const { return sizeof(uuid_presentation_.uuid); } |
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private: |
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void MkUuid(); |
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Uuid(); |
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std::string uuid_; |
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union { |
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uuid_t uuid; |
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struct __attribute__((__packed__)) { |
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uint32_t a; |
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uint16_t b; |
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uint16_t c; |
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uint16_t d; |
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uint32_t e1; |
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uint16_t e2; |
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} split; |
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} uuid_presentation_; |
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}; |
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} // namespace cvmfs |
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#endif // CVMFS_UTIL_UUID_H_ |
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