sal/rtl/uuid.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <string.h>
  21 #include <stdlib.h>
  22
  23 #include <osl/mutex.hxx>
  24 #include <rtl/random.h>
  25 #include <rtl/uuid.h>
  26 #include <rtl/digest.h>
  27
  28 #define SWAP_INT32_TO_NETWORK(x)\
  29                { sal_uInt32 y = x;\
  30                  sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(x)); \
  31                  p[0] = static_cast<sal_uInt8>( ( y >> 24 ) & 0xff );\
  32                  p[1] = static_cast<sal_uInt8>( ( y >> 16 ) & 0xff );\
  33                  p[2] = static_cast<sal_uInt8>( ( y >> 8 )  & 0xff );\
  34                  p[3] = static_cast<sal_uInt8>( ( y ) & 0xff);\
  35                }
  36 #define SWAP_INT16_TO_NETWORK(x)\
  37                { sal_uInt16 y = x;\
  38                  sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(x)); \
  39                  p[0] = static_cast<sal_uInt8>( ( y >> 8 )  & 0xff );\
  40                  p[1] = static_cast<sal_uInt8>( ( y ) & 0xff);\
  41                }
  42
  43 #define SWAP_NETWORK_TO_INT16(x)\
  44                { sal_uInt16 y = x;\
  45                  sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(y));\
  46                  x = ( ( (static_cast<sal_uInt16>(p[0])) & 0xff) << 8 ) |\
  47                      ( (  static_cast<sal_uInt16>(p[1])) & 0xff);\
  48                }
  49 #define SWAP_NETWORK_TO_INT32(x)\
  50                { sal_uInt32 y = x;\
  51                  sal_uInt8 *p = reinterpret_cast<sal_uInt8 *>(&(y)); \
  52                  x = ( ( (static_cast<sal_uInt32>(p[0])) & 0xff) << 24 ) |\
  53                      ( ( (static_cast<sal_uInt32>(p[1])) & 0xff) << 16 ) |\
  54                      ( ( (static_cast<sal_uInt32>(p[2])) & 0xff) << 8  ) |\
  55                      ( (  static_cast<sal_uInt32>(p[3])) & 0xff);\
  56                }
  57
  58 namespace {
  59
  60 struct UUID
  61 {
  62       sal_uInt32          time_low;
  63       sal_uInt16          time_mid;
  64       sal_uInt16          time_hi_and_version;
  65       sal_uInt8           clock_seq_hi_and_reserved;
  66       sal_uInt8           clock_seq_low;
  67       sal_uInt8           node[6];
  68 };
  69
  70 }
  71
  72 static void write_v3( sal_uInt8 *pUuid  )
  73 {
  74     UUID uuid;
  75     // copy to avoid alignment problems
  76     memcpy(&uuid, pUuid, 16);
  77
  78     SWAP_NETWORK_TO_INT32(uuid.time_low);
  79     SWAP_NETWORK_TO_INT16(uuid.time_mid);
  80     SWAP_NETWORK_TO_INT16(uuid.time_hi_and_version);
  81
  82     /* put in the variant and version bits */
  83     uuid.time_hi_and_version &= 0x0FFF;
  84     uuid.time_hi_and_version |= (3 << 12);
  85     uuid.clock_seq_hi_and_reserved &= 0x3F;
  86     uuid.clock_seq_hi_and_reserved |= 0x80;
  87
  88     SWAP_INT32_TO_NETWORK(uuid.time_low);
  89     SWAP_INT16_TO_NETWORK(uuid.time_mid);
  90     SWAP_INT16_TO_NETWORK(uuid.time_hi_and_version);
  91
  92     memcpy(pUuid, &uuid, 16);
  93 }
  94
  95 extern "C" void SAL_CALL rtl_createUuid(sal_uInt8 *pTargetUUID ,
  96                                         SAL_UNUSED_PARAMETER const sal_uInt8 *,
  97                                         SAL_UNUSED_PARAMETER sal_Bool)
  98 {
  99     {
 100         static rtlRandomPool pool = []() {
 101             rtlRandomPool aPool = rtl_random_createPool();
 102             if (!aPool)
 103             {
 104                 abort();
 105                 // only possible way to signal failure here (rtl_createUuid
 106                 // being part of a fixed C API)
 107             }
 108             return aPool;
 109         }();
 110
 111         osl::MutexGuard g(osl::Mutex::getGlobalMutex());
 112         if (rtl_random_getBytes(pool, pTargetUUID, 16) != rtl_Random_E_None)
 113         {
 114             abort();
 115                 // only possible way to signal failure here (rtl_createUuid
 116                 // being part of a fixed C API)
 117         }
 118     }
 119     // See ITU-T Recommendation X.667:
 120     pTargetUUID[6] &= 0x0F;
 121     pTargetUUID[6] |= 0x40;
 122     pTargetUUID[8] &= 0x3F;
 123     pTargetUUID[8] |= 0x80;
 124 }
 125
 126 extern "C" void SAL_CALL rtl_createNamedUuid(sal_uInt8 *pTargetUUID,
 127                                              const sal_uInt8 *pNameSpaceUUID,
 128                                              const rtl_String *pName )
 129 {
 130     rtlDigest digest = rtl_digest_createMD5();
 131
 132     rtl_digest_updateMD5(digest, pNameSpaceUUID, 16);
 133     rtl_digest_updateMD5(digest, pName->buffer, pName->length);
 134
 135     rtl_digest_getMD5(digest, pTargetUUID, 16);
 136     rtl_digest_destroyMD5(digest);
 137
 138     write_v3(pTargetUUID);
 139 }
 140
 141 extern "C" sal_Int32 SAL_CALL rtl_compareUuid(const sal_uInt8 *pUUID1, const sal_uInt8 *pUUID2)
 142 {
 143     int i;
 144     UUID u1;
 145     UUID u2;
 146     memcpy(&u1, pUUID1, 16 );
 147     memcpy(&u2, pUUID2, 16 );
 148
 149     SWAP_NETWORK_TO_INT32(u1.time_low);
 150     SWAP_NETWORK_TO_INT16(u1.time_mid);
 151     SWAP_NETWORK_TO_INT16(u1.time_hi_and_version);
 152
 153     SWAP_NETWORK_TO_INT32(u2.time_low);
 154     SWAP_NETWORK_TO_INT16(u2.time_mid);
 155     SWAP_NETWORK_TO_INT16(u2.time_hi_and_version);
 156
 157 #define CHECK(f1, f2) if (f1 != f2) return f1 < f2 ? -1 : 1;
 158     CHECK(u1.time_low, u2.time_low);
 159     CHECK(u1.time_mid, u2.time_mid);
 160     CHECK(u1.time_hi_and_version, u2.time_hi_and_version);
 161     CHECK(u1.clock_seq_hi_and_reserved, u2.clock_seq_hi_and_reserved);
 162     CHECK(u1.clock_seq_low, u2.clock_seq_low);
 163     for (i = 0; i < 6; i++)
 164     {
 165         if (u1.node[i] < u2.node[i])
 166             return -1;
 167         if (u1.node[i] > u2.node[i])
 168             return 1;
 169     }
 170     return 0;
 171 }
 172
 173 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */