go/uuid
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do not use fmt.Sprintf() in UUID.URN()

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The procedure is the same as UUID.String() (see f4e3abb).  Code is not
shared to ensure that unnecessary bounds checks do not occur.
This commit is contained in:
Bryan Matsuo 2015-10-10 19:03:07 -07:00
parent 71fb85a64c
commit 9e4836cc57
1 changed files with 13 additions and 3 deletions
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16
uuid.go
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@ -101,9 +101,19 @@ func (uuid UUID) URN() string {
if uuid == nil || len(uuid) != 16 {
return ""
}
b := []byte(uuid)
return fmt.Sprintf("urn:uuid:%08x-%04x-%04x-%04x-%012x",
b[:4], b[4:6], b[6:8], b[8:10], b[10:])
var buf [36 + 9]byte
copy(buf[:], "urn:uuid:")
_buf := buf[9:]
hex.Encode(_buf[:], uuid[:4])
_buf[8] = '-'
hex.Encode(_buf[9:13], uuid[4:6])
_buf[13] = '-'
hex.Encode(_buf[14:18], uuid[6:8])
_buf[18] = '-'
hex.Encode(_buf[19:23], uuid[8:10])
_buf[23] = '-'
hex.Encode(_buf[24:], uuid[10:])
return string(buf[:])
}
// Variant returns the variant encoded in uuid. It returns Invalid if