| 1 | // Copyright 2016 Google Inc. All rights reserved.
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| 2 | // Use of this source code is governed by a BSD-style
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| 3 | // license that can be found in the LICENSE file.
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| 4 |
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| 5 | package uuid
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| 6 |
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| 7 | import (
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| 8 | "io"
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| 9 | )
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| 10 |
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| 11 | // randomBits completely fills slice b with random data.
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| 12 | func randomBits(b []byte) {
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| 13 | if _, err := io.ReadFull(rander, b); err != nil {
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| 14 | panic(err.Error()) // rand should never fail
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| 15 | }
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| 16 | }
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| 17 |
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| 18 | // xvalues returns the value of a byte as a hexadecimal digit or 255.
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| 19 | var xvalues = [256]byte{
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| 20 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 21 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 22 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 23 | 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255, 255, 255, 255,
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| 24 | 255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 25 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 26 | 255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 27 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 28 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 29 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 30 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 31 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 32 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 33 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 34 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 35 | 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
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| 36 | }
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| 37 |
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| 38 | // xtob converts hex characters x1 and x2 into a byte.
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| 39 | func xtob(x1, x2 byte) (byte, bool) {
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| 40 | b1 := xvalues[x1]
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| 41 | b2 := xvalues[x2]
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| 42 | return (b1 << 4) | b2, b1 != 255 && b2 != 255
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| 43 | }
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