1  // Copyright 2007 Google LLC
 2  //
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 4  // modification, are permitted provided that the following conditions are
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 9  //     * Redistributions in binary form must reproduce the above
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28  
29  // Author: Alfred Peng
30  
31  #ifdef HAVE_CONFIG_H
32  #include <config.h>  // Must come first
33  #endif
34  
35  #include <cassert>
36  #include <ctime>
37  
38  #include <stdio.h>
39  #include <stdlib.h>
40  #include <unistd.h>
41  
42  #include "common/solaris/guid_creator.h"
43  
44  //
45  // GUIDGenerator
46  //
47  // This class is used to generate random GUID.
48  // Currently use random number to generate a GUID. This should be OK since
49  // we don't expect crash to happen very offen.
50  //
51  class GUIDGenerator {
52   public:
53    GUIDGenerator() {
54      srandom(time(NULL));
55    }
56  
57    bool CreateGUID(GUID *guid) const {
58      guid->data1 = random();
59      guid->data2 = (uint16_t)(random());
60      guid->data3 = (uint16_t)(random());
61      *reinterpret_cast<uint32_t*>(&guid->data4[0]) = random();
62      *reinterpret_cast<uint32_t*>(&guid->data4[4]) = random();
63      return true;
64    }
65  };
66  
67  // Guid generator.
68  const GUIDGenerator kGuidGenerator;
69  
70  bool CreateGUID(GUID *guid) {
71    return kGuidGenerator.CreateGUID(guid);
72  }
73  
74  // Parse guid to string.
75  bool GUIDToString(const GUID *guid, char *buf, int buf_len) {
76    // Should allow more space the the max length of GUID.
77    assert(buf_len > kGUIDStringLength);
78    int num = snprintf(buf, buf_len, kGUIDFormatString,
79                       guid->data1, guid->data2, guid->data3,
80                       *reinterpret_cast<const uint32_t*>(&(guid->data4[0])),
81                       *reinterpret_cast<const uint32_t*>(&(guid->data4[4])));
82    if (num != kGUIDStringLength)
83      return false;
84  
85    buf[num] = '\0';
86    return true;
87  }