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58 lines
2.1 KiB
Go
58 lines
2.1 KiB
Go
// Copyright 2014 Google Inc. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package uuid
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import (
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"encoding/binary"
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guuid "github.com/google/uuid"
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)
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// A Time represents a time as the number of 100's of nanoseconds since 15 Oct
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// 1582.
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type Time = guuid.Time
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// GetTime returns the current Time (100s of nanoseconds since 15 Oct 1582) and
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// clock sequence as well as adjusting the clock sequence as needed. An error
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// is returned if the current time cannot be determined.
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func GetTime() (Time, uint16, error) { return guuid.GetTime() }
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// ClockSequence returns the current clock sequence, generating one if not
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// already set. The clock sequence is only used for Version 1 UUIDs.
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//
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// The uuid package does not use global static storage for the clock sequence or
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// the last time a UUID was generated. Unless SetClockSequence a new random
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// clock sequence is generated the first time a clock sequence is requested by
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// ClockSequence, GetTime, or NewUUID. (section 4.2.1.1) sequence is generated
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// for
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func ClockSequence() int { return guuid.ClockSequence() }
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// SetClockSequence sets the clock sequence to the lower 14 bits of seq. Setting to
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// -1 causes a new sequence to be generated.
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func SetClockSequence(seq int) { guuid.SetClockSequence(seq) }
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// Time returns the time in 100s of nanoseconds since 15 Oct 1582 encoded in
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// uuid. It returns false if uuid is not valid. The time is only well defined
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// for version 1 and 2 UUIDs.
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func (uuid UUID) Time() (Time, bool) {
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if len(uuid) != 16 {
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return 0, false
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}
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time := int64(binary.BigEndian.Uint32(uuid[0:4]))
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time |= int64(binary.BigEndian.Uint16(uuid[4:6])) << 32
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time |= int64(binary.BigEndian.Uint16(uuid[6:8])&0xfff) << 48
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return Time(time), true
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}
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// ClockSequence returns the clock sequence encoded in uuid. It returns false
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// if uuid is not valid. The clock sequence is only well defined for version 1
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// and 2 UUIDs.
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func (uuid UUID) ClockSequence() (int, bool) {
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if len(uuid) != 16 {
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return 0, false
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}
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return int(binary.BigEndian.Uint16(uuid[8:10])) & 0x3fff, true
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}
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