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ydb
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github.com
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google
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uuid
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util.go

util.go 1.9 KB
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  1. // Copyright 2016 Google Inc.  All rights reserved.
    2. 

  2. // Use of this source code is governed by a BSD-style
    3. 

  3. // license that can be found in the LICENSE file.
    4. 

  4. 

  5. package uuid
    6. 

  6. 

  7. import (
    8. 

  8. 	"io"
    9. 

  9. )
    10. 

  10. 

  11. // randomBits completely fills slice b with random data.
    12. 

  12. func randomBits(b []byte) {
    13. 

  13. 	if _, err := io.ReadFull(rander, b); err != nil {
    14. 

  14. 		panic(err.Error()) // rand should never fail
    15. 

  15. 	}
    16. 

  16. }
    17. 

  17. 

  18. // xvalues returns the value of a byte as a hexadecimal digit or 255.
    19. 

  19. var xvalues = [256]byte{
    20. 

  20. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    21. 

  21. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    22. 

  22. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    23. 

  23. 	0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 255, 255, 255, 255, 255, 255,
    24. 

  24. 	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    25. 

  25. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    26. 

  26. 	255, 10, 11, 12, 13, 14, 15, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    27. 

  27. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    28. 

  28. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    29. 

  29. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    30. 

  30. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    31. 

  31. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    32. 

  32. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    33. 

  33. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    34. 

  34. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    35. 

  35. 	255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
    36. 

  36. }
    37. 

  37. 

  38. // xtob converts hex characters x1 and x2 into a byte.
    39. 

  39. func xtob(x1, x2 byte) (byte, bool) {
    40. 

  40. 	b1 := xvalues[x1]
    41. 

  41. 	b2 := xvalues[x2]
    42. 

  42. 	return (b1 << 4) | b2, b1 != 255 && b2 != 255
    43. 

  43. }
    44.