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1 // Copyright (c) 2007, Google Inc. |
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2 // All rights reserved. |
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3 // |
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4 // Redistribution and use in source and binary forms, with or without |
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5 // modification, are permitted provided that the following conditions are |
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6 // met: |
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7 // |
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8 // * Redistributions of source code must retain the above copyright |
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9 // notice, this list of conditions and the following disclaimer. |
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10 // * Redistributions in binary form must reproduce the above |
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11 // copyright notice, this list of conditions and the following disclaimer |
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12 // in the documentation and/or other materials provided with the |
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13 // distribution. |
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14 // * Neither the name of Google Inc. nor the names of its |
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15 // contributors may be used to endorse or promote products derived from |
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16 // this software without specific prior written permission. |
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17 // |
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18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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29 |
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30 // Author: Alfred Peng |
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31 |
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32 #include <cassert> |
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33 #include <ctime> |
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34 |
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35 #include <stdio.h> |
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36 #include <stdlib.h> |
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37 #include <unistd.h> |
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38 |
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39 #include "common/solaris/guid_creator.h" |
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40 |
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41 // |
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42 // GUIDGenerator |
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43 // |
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44 // This class is used to generate random GUID. |
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45 // Currently use random number to generate a GUID. This should be OK since |
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46 // we don't expect crash to happen very offen. |
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47 // |
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48 class GUIDGenerator { |
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49 public: |
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50 GUIDGenerator() { |
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51 srandom(time(NULL)); |
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52 } |
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53 |
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54 bool CreateGUID(GUID *guid) const { |
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55 guid->data1 = random(); |
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56 guid->data2 = (uint16_t)(random()); |
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57 guid->data3 = (uint16_t)(random()); |
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58 *reinterpret_cast<uint32_t*>(&guid->data4[0]) = random(); |
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59 *reinterpret_cast<uint32_t*>(&guid->data4[4]) = random(); |
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60 return true; |
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61 } |
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62 }; |
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63 |
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64 // Guid generator. |
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65 const GUIDGenerator kGuidGenerator; |
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66 |
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67 bool CreateGUID(GUID *guid) { |
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68 return kGuidGenerator.CreateGUID(guid); |
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69 }; |
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70 |
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71 // Parse guid to string. |
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72 bool GUIDToString(const GUID *guid, char *buf, int buf_len) { |
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73 // Should allow more space the the max length of GUID. |
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74 assert(buf_len > kGUIDStringLength); |
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75 int num = snprintf(buf, buf_len, kGUIDFormatString, |
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76 guid->data1, guid->data2, guid->data3, |
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77 *reinterpret_cast<const uint32_t *>(&(guid->data4[0])), |
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78 *reinterpret_cast<const uint32_t *>(&(guid->data4[4]))); |
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79 if (num != kGUIDStringLength) |
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80 return false; |
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81 |
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82 buf[num] = '\0'; |
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83 return true; |
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84 } |