75 строки
2.3 KiB
C
75 строки
2.3 KiB
C
/*
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* UUID/GUID definition
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*
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* Copyright (C) 2010, 2016 Intel Corp.
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* Huang Ying <ying.huang@intel.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version
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* 2 as published by the Free Software Foundation;
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef _LINUX_UUID_H_
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#define _LINUX_UUID_H_
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#include <uapi/linux/uuid.h>
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/*
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* V1 (time-based) UUID definition [RFC 4122].
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* - the timestamp is a 60-bit value, split 32/16/12, and goes in 100ns
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* increments since midnight 15th October 1582
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* - add AFS_UUID_TO_UNIX_TIME to convert unix time in 100ns units to UUID
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* time
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* - the clock sequence is a 14-bit counter to avoid duplicate times
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*/
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struct uuid_v1 {
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__be32 time_low; /* low part of timestamp */
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__be16 time_mid; /* mid part of timestamp */
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__be16 time_hi_and_version; /* high part of timestamp and version */
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#define UUID_TO_UNIX_TIME 0x01b21dd213814000ULL
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#define UUID_TIMEHI_MASK 0x0fff
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#define UUID_VERSION_TIME 0x1000 /* time-based UUID */
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#define UUID_VERSION_NAME 0x3000 /* name-based UUID */
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#define UUID_VERSION_RANDOM 0x4000 /* (pseudo-)random generated UUID */
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u8 clock_seq_hi_and_reserved; /* clock seq hi and variant */
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#define UUID_CLOCKHI_MASK 0x3f
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#define UUID_VARIANT_STD 0x80
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u8 clock_seq_low; /* clock seq low */
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u8 node[6]; /* spatially unique node ID (MAC addr) */
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};
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/*
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* The length of a UUID string ("aaaaaaaa-bbbb-cccc-dddd-eeeeeeeeeeee")
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* not including trailing NUL.
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*/
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#define UUID_STRING_LEN 36
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static inline int uuid_le_cmp(const uuid_le u1, const uuid_le u2)
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{
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return memcmp(&u1, &u2, sizeof(uuid_le));
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}
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static inline int uuid_be_cmp(const uuid_be u1, const uuid_be u2)
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{
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return memcmp(&u1, &u2, sizeof(uuid_be));
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}
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void generate_random_uuid(unsigned char uuid[16]);
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extern void uuid_le_gen(uuid_le *u);
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extern void uuid_be_gen(uuid_be *u);
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bool __must_check uuid_is_valid(const char *uuid);
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extern const u8 uuid_le_index[16];
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extern const u8 uuid_be_index[16];
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int uuid_le_to_bin(const char *uuid, uuid_le *u);
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int uuid_be_to_bin(const char *uuid, uuid_be *u);
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#endif
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