Line data    Source code

       1             : /******************************************************************************
       2             :  *
       3             :  * Project:  OpenGIS Simple Features Reference Implementation
       4             :  * Purpose:  Implements Open FileGDB OGR driver.
       5             :  * Author:   Even Rouault, <even dot rouault at spatialys.com>
       6             :  *
       7             :  ******************************************************************************
       8             :  * Copyright (c) 2022, Even Rouault <even dot rouault at spatialys.com>
       9             :  *
      10             :  * Permission is hereby granted, free of charge, to any person obtaining a
      11             :  * copy of this software and associated documentation files (the "Software"),
      12             :  * to deal in the Software without restriction, including without limitation
      13             :  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      14             :  * and/or sell copies of the Software, and to permit persons to whom the
      15             :  * Software is furnished to do so, subject to the following conditions:
      16             :  *
      17             :  * The above copyright notice and this permission notice shall be included
      18             :  * in all copies or substantial portions of the Software.
      19             :  *
      20             :  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
      21             :  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
      22             :  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
      23             :  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
      24             :  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
      25             :  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
      26             :  * DEALINGS IN THE SOFTWARE.
      27             :  ****************************************************************************/
      28             : 
      29             : #include "cpl_port.h"
      30             : #include "ogr_openfilegdb.h"
      31             : 
      32             : #include <random>
      33             : #include <sstream>
      34             : 
      35             : /************************************************************************/
      36             : /*                        CPLGettimeofday()                             */
      37             : /************************************************************************/
      38             : 
      39             : #if defined(_WIN32) && !defined(__CYGWIN__)
      40             : #include <sys/timeb.h>
      41             : 
      42             : namespace
      43             : {
      44             : struct CPLTimeVal
      45             : {
      46             :     time_t tv_sec; /* seconds */
      47             :     long tv_usec;  /* and microseconds */
      48             : };
      49             : }  // namespace
      50             : 
      51             : static int CPLGettimeofday(struct CPLTimeVal *tp, void * /* timezonep*/)
      52             : {
      53             :     struct _timeb theTime;
      54             : 
      55             :     _ftime(&theTime);
      56             :     tp->tv_sec = static_cast<time_t>(theTime.time);
      57             :     tp->tv_usec = theTime.millitm * 1000;
      58             :     return 0;
      59             : }
      60             : #else
      61             : #include <sys/time.h> /* for gettimeofday() */
      62             : #define CPLTimeVal timeval
      63             : #define CPLGettimeofday(t, u) gettimeofday(t, u)
      64             : #endif
      65             : 
      66             : /***********************************************************************/
      67             : /*                      OFGDBGenerateUUID()                            */
      68             : /***********************************************************************/
      69             : 
      70             : // Probably not the best UUID generator ever. One issue is that mt19937
      71             : // uses only a 32-bit seed.
      72             : CPL_NOSANITIZE_UNSIGNED_INT_OVERFLOW
      73        1026 : std::string OFGDBGenerateUUID()
      74             : {
      75             :     struct CPLTimeVal tv;
      76        1026 :     memset(&tv, 0, sizeof(tv));
      77             :     static uint32_t nCounter = 0;
      78             :     const bool bReproducibleUUID =
      79        1026 :         CPLTestBool(CPLGetConfigOption("OPENFILEGDB_REPRODUCIBLE_UUID", "NO"));
      80             : 
      81        2052 :     std::stringstream ss;
      82             : 
      83             :     {
      84        1026 :         if (!bReproducibleUUID)
      85        1026 :             CPLGettimeofday(&tv, nullptr);
      86        2052 :         std::mt19937 gen(++nCounter +
      87             :                          (bReproducibleUUID
      88           0 :                               ? 0
      89        1026 :                               : static_cast<unsigned>(tv.tv_sec ^ tv.tv_usec)));
      90        1026 :         std::uniform_int_distribution<> dis(0, 15);
      91             : 
      92        1026 :         ss << "{";
      93        1026 :         ss << std::hex;
      94        9234 :         for (int i = 0; i < 8; i++)
      95             :         {
      96        8208 :             ss << dis(gen);
      97             :         }
      98        1026 :         ss << "-";
      99        5130 :         for (int i = 0; i < 4; i++)
     100             :         {
     101        4104 :             ss << dis(gen);
     102             :         }
     103        1026 :         ss << "-4";
     104        4104 :         for (int i = 0; i < 3; i++)
     105             :         {
     106        3078 :             ss << dis(gen);
     107             :         }
     108             :     }
     109             : 
     110             :     {
     111        1026 :         if (!bReproducibleUUID)
     112        1026 :             CPLGettimeofday(&tv, nullptr);
     113        2052 :         std::mt19937 gen(++nCounter +
     114             :                          (bReproducibleUUID
     115           0 :                               ? 0
     116        1026 :                               : static_cast<unsigned>(tv.tv_sec ^ tv.tv_usec)));
     117        1026 :         std::uniform_int_distribution<> dis(0, 15);
     118        1026 :         std::uniform_int_distribution<> dis2(8, 11);
     119             : 
     120        1026 :         ss << "-";
     121        1026 :         ss << dis2(gen);
     122        4104 :         for (int i = 0; i < 3; i++)
     123             :         {
     124        3078 :             ss << dis(gen);
     125             :         }
     126        1026 :         ss << "-";
     127       13338 :         for (int i = 0; i < 12; i++)
     128             :         {
     129       12312 :             ss << dis(gen);
     130             :         };
     131        1026 :         ss << "}";
     132        2052 :         return ss.str();
     133             :     }
     134             : }