Sha256: b4429d321b084dbf1a22871e2ce3d1df6080423eea7c9841166302e032adceb3
Contents?: true
Size: 1.74 KB
Versions: 16
Compression:
Stored size: 1.74 KB
Contents
//go:build go1.18
// +build go1.18
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
package uuid
import (
"crypto/rand"
"errors"
"fmt"
"strconv"
)
// The UUID reserved variants.
const (
reservedRFC4122 byte = 0x40
)
// A UUID representation compliant with specification in RFC4122 document.
type UUID [16]byte
// New returns a new UUID using the RFC4122 algorithm.
func New() (UUID, error) {
u := UUID{}
// Set all bits to pseudo-random values.
// NOTE: this takes a process-wide lock
_, err := rand.Read(u[:])
if err != nil {
return u, err
}
u[8] = (u[8] | reservedRFC4122) & 0x7F // u.setVariant(ReservedRFC4122)
var version byte = 4
u[6] = (u[6] & 0xF) | (version << 4) // u.setVersion(4)
return u, nil
}
// String returns the UUID in "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx" format.
func (u UUID) String() string {
return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
}
// Parse parses a string formatted as "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"
// or "{xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}" into a UUID.
func Parse(s string) (UUID, error) {
var uuid UUID
// ensure format
switch len(s) {
case 36:
// xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
case 38:
// {xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx}
s = s[1:37]
default:
return uuid, errors.New("invalid UUID format")
}
if s[8] != '-' || s[13] != '-' || s[18] != '-' || s[23] != '-' {
return uuid, errors.New("invalid UUID format")
}
// parse chunks
for i, x := range [16]int{
0, 2, 4, 6,
9, 11,
14, 16,
19, 21,
24, 26, 28, 30, 32, 34} {
b, err := strconv.ParseUint(s[x:x+2], 16, 8)
if err != nil {
return uuid, fmt.Errorf("invalid UUID format: %s", err)
}
uuid[i] = byte(b)
}
return uuid, nil
}
Version data entries
16 entries across 16 versions & 1 rubygems