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78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package azblob
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import (
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"crypto/rand"
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"fmt"
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"strconv"
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)
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// The UUID reserved variants.
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const (
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reservedNCS byte = 0x80
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reservedRFC4122 byte = 0x40
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reservedMicrosoft byte = 0x20
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reservedFuture byte = 0x00
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)
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// A UUID representation compliant with specification in RFC 4122 document.
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type uuid [16]byte
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// NewUUID returns a new uuid using RFC 4122 algorithm.
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func newUUID() (u uuid) {
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u = uuid{}
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// Set all bits to randomly (or pseudo-randomly) chosen values.
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rand.Read(u[:])
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u[8] = (u[8] | reservedRFC4122) & 0x7F // u.setVariant(ReservedRFC4122)
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var version byte = 4
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u[6] = (u[6] & 0xF) | (version << 4) // u.setVersion(4)
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return
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}
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// String returns an unparsed version of the generated UUID sequence.
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func (u uuid) String() string {
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return fmt.Sprintf("%x-%x-%x-%x-%x", u[0:4], u[4:6], u[6:8], u[8:10], u[10:])
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}
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// ParseUUID parses a string formatted as "003020100-0504-0706-0809-0a0b0c0d0e0f"
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// or "{03020100-0504-0706-0809-0a0b0c0d0e0f}" into a UUID.
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func parseUUID(uuidStr string) uuid {
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char := func(hexString string) byte {
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i, _ := strconv.ParseUint(hexString, 16, 8)
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return byte(i)
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}
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if uuidStr[0] == '{' {
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uuidStr = uuidStr[1:] // Skip over the '{'
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}
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// 03020100 - 05 04 - 07 06 - 08 09 - 0a 0b 0c 0d 0e 0f
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// 1 11 1 11 11 1 12 22 2 22 22 22 33 33 33
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// 01234567 8 90 12 3 45 67 8 90 12 3 45 67 89 01 23 45
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uuidVal := uuid{
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char(uuidStr[0:2]),
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char(uuidStr[2:4]),
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char(uuidStr[4:6]),
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char(uuidStr[6:8]),
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char(uuidStr[9:11]),
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char(uuidStr[11:13]),
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char(uuidStr[14:16]),
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char(uuidStr[16:18]),
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char(uuidStr[19:21]),
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char(uuidStr[21:23]),
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char(uuidStr[24:26]),
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char(uuidStr[26:28]),
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char(uuidStr[28:30]),
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char(uuidStr[30:32]),
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char(uuidStr[32:34]),
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char(uuidStr[34:36]),
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}
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return uuidVal
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}
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func (u uuid) bytes() []byte {
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return u[:]
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}
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