1 // Copyright (c) 2007, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // Author: Alfred Peng 31 32 #include <cassert> 33 #include <ctime> 34 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <unistd.h> 38 39 #include "common/solaris/guid_creator.h" 40 41 // 42 // GUIDGenerator 43 // 44 // This class is used to generate random GUID. 45 // Currently use random number to generate a GUID. This should be OK since 46 // we don't expect crash to happen very offen. 47 // 48 class GUIDGenerator { 49 public: 50 GUIDGenerator() { 51 srandom(time(NULL)); 52 } 53 54 bool CreateGUID(GUID *guid) const { 55 guid->data1 = random(); 56 guid->data2 = (uint16_t)(random()); 57 guid->data3 = (uint16_t)(random()); 58 *reinterpret_cast<uint32_t*>(&guid->data4[0]) = random(); 59 *reinterpret_cast<uint32_t*>(&guid->data4[4]) = random(); 60 return true; 61 } 62 }; 63 64 // Guid generator. 65 const GUIDGenerator kGuidGenerator; 66 67 bool CreateGUID(GUID *guid) { 68 return kGuidGenerator.CreateGUID(guid); 69 }; 70 71 // Parse guid to string. 72 bool GUIDToString(const GUID *guid, char *buf, int buf_len) { 73 // Should allow more space the the max length of GUID. 74 assert(buf_len > kGUIDStringLength); 75 int num = snprintf(buf, buf_len, kGUIDFormatString, 76 guid->data1, guid->data2, guid->data3, 77 *reinterpret_cast<const uint32_t *>(&(guid->data4[0])), 78 *reinterpret_cast<const uint32_t *>(&(guid->data4[4]))); 79 if (num != kGUIDStringLength) 80 return false; 81 82 buf[num] = '\0'; 83 return true; 84 } 85
