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
  21 #include <string.h>
  22 #include <stdlib.h>
  23
  24 #include <osl/mutex.hxx>
  25 #include <rtl/random.h>
  26 #include <rtl/uuid.h>
  27 #include <rtl/digest.h>
  28
  29 #define SWAP_INT32_TO_NETWORK(x)\
  30                { sal_uInt32 y = x;\
  31                  sal_uInt8 *p = (sal_uInt8 * )&(x); \
  32                  p[0] = (sal_uInt8) ( ( y >> 24 ) & 0xff );\
  33                  p[1] = (sal_uInt8) ( ( y >> 16 ) & 0xff );\
  34                  p[2] = (sal_uInt8) ( ( y >> 8 )  & 0xff );\
  35                  p[3] = (sal_uInt8) ( ( y ) & 0xff);\
  36                }
  37 #define SWAP_INT16_TO_NETWORK(x)\
  38                { sal_uInt16 y = x;\
  39                  sal_uInt8 *p = (sal_uInt8 * )&(x); \
  40                  p[0] = (sal_uInt8) ( ( y >> 8 )  & 0xff );\
  41                  p[1] = (sal_uInt8) ( ( y ) & 0xff);\
  42                }
  43
  44 #define SWAP_NETWORK_TO_INT16(x)\
  45                { sal_uInt16 y = x;\
  46                  sal_uInt8 *p = (sal_uInt8 * )&(y);\
  47                  x = ( ( ((sal_uInt16)p[0]) & 0xff) << 8 ) |\
  48                      ( (  (sal_uInt16)p[1]) & 0xff);\
  49                }
  50 #define SWAP_NETWORK_TO_INT32(x)\
  51                { sal_uInt32 y = x;\
  52                  sal_uInt8 *p = (sal_uInt8 * )&(y); \
  53                  x = ( ( ((sal_uInt32)p[0]) & 0xff) << 24 ) |\
  54                      ( ( ((sal_uInt32)p[1]) & 0xff) << 16 ) |\
  55                      ( ( ((sal_uInt32)p[2]) & 0xff) << 8  ) |\
  56                      ( (  (sal_uInt32)p[3]) & 0xff);\
  57                }
  58
  59 struct UUID
  60 {
  61       sal_uInt32          time_low;
  62       sal_uInt16          time_mid;
  63       sal_uInt16          time_hi_and_version;
  64       sal_uInt8           clock_seq_hi_and_reserved;
  65       sal_uInt8           clock_seq_low;
  66       sal_uInt8           node[6];
  67 };
  68
  69 static  void write_v3( sal_uInt8 *pUuid  )
  70 {
  71     UUID uuid;
  72     // copy to avoid alignment problems
  73     memcpy( &uuid , pUuid , 16 );
  74
  75     SWAP_NETWORK_TO_INT32( uuid.time_low );
  76     SWAP_NETWORK_TO_INT16( uuid.time_mid );
  77     SWAP_NETWORK_TO_INT16( uuid.time_hi_and_version );
  78
  79     /* put in the variant and version bits */
  80     uuid.time_hi_and_version       &= 0x0FFF;
  81     uuid.time_hi_and_version       |= (3 << 12);
  82     uuid.clock_seq_hi_and_reserved &= 0x3F;
  83     uuid.clock_seq_hi_and_reserved |= 0x80;
  84
  85     SWAP_INT32_TO_NETWORK( uuid.time_low );
  86     SWAP_INT16_TO_NETWORK( uuid.time_mid );
  87     SWAP_INT16_TO_NETWORK( uuid.time_hi_and_version );
  88
  89     memcpy( pUuid , &uuid , 16 );
  90 }
  91
  92
  93 extern "C" void SAL_CALL rtl_createUuid( sal_uInt8 *pTargetUUID ,
  94                                          SAL_UNUSED_PARAMETER const sal_uInt8 *,
  95                                          SAL_UNUSED_PARAMETER sal_Bool )
  96 {
  97     {
  98         osl::MutexGuard g(osl::Mutex::getGlobalMutex());
  99         static rtlRandomPool pool = NULL;
 100         if (pool == NULL) {
 101             pool = rtl_random_createPool();
 102             if (pool == NULL) {
 103                 abort();
 104                     // only possible way to signal failure here (rtl_createUuid
 105                     // being part of a fixed C API)
 106             }
 107         }
 108         if (rtl_random_getBytes(pool, pTargetUUID, 16) != rtl_Random_E_None) {
 109             abort();
 110                 // only possible way to signal failure here (rtl_createUuid
 111                 // being part of a fixed C API)
 112         }
 113     }
 114     // See ITU-T Recommendation X.667:
 115     pTargetUUID[6] &= 0x0F;
 116     pTargetUUID[6] |= 0x40;
 117     pTargetUUID[8] &= 0x3F;
 118     pTargetUUID[8] |= 0x80;
 119 }
 120
 121
 122 extern "C" void SAL_CALL rtl_createNamedUuid( sal_uInt8  *pTargetUUID,
 123                                               const sal_uInt8  *pNameSpaceUUID,
 124                                               const rtl_String *pName )
 125 {
 126     rtlDigest digest = rtl_digest_createMD5  ();
 127
 128     rtl_digest_updateMD5( digest, pNameSpaceUUID , 16 );
 129     rtl_digest_updateMD5( digest, pName->buffer , pName->length );
 130
 131     rtl_digest_getMD5( digest, pTargetUUID , 16 );
 132     rtl_digest_destroyMD5 (digest);
 133
 134     write_v3(pTargetUUID);
 135 }
 136
 137
 138
 139 extern "C" sal_Int32 SAL_CALL rtl_compareUuid( const sal_uInt8 *pUUID1 , const sal_uInt8 *pUUID2 )
 140 {
 141     int i;
 142     UUID u1;
 143     UUID u2;
 144     memcpy( &u1 , pUUID1 , 16 );
 145     memcpy( &u2 , pUUID2 , 16 );
 146
 147     SWAP_NETWORK_TO_INT32( u1.time_low );
 148     SWAP_NETWORK_TO_INT16( u1.time_mid );
 149     SWAP_NETWORK_TO_INT16( u1.time_hi_and_version );
 150
 151     SWAP_NETWORK_TO_INT32( u2.time_low );
 152     SWAP_NETWORK_TO_INT16( u2.time_mid );
 153     SWAP_NETWORK_TO_INT16( u2.time_hi_and_version );
 154
 155 #define CHECK(f1, f2) if (f1 != f2) return f1 < f2 ? -1 : 1;
 156     CHECK(u1.time_low, u2.time_low);
 157     CHECK(u1.time_mid, u2.time_mid);
 158     CHECK(u1.time_hi_and_version, u2.time_hi_and_version);
 159     CHECK(u1.clock_seq_hi_and_reserved, u2.clock_seq_hi_and_reserved);
 160     CHECK(u1.clock_seq_low, u2.clock_seq_low);
 161     for (i = 0; i < 6; i++)
 162     {
 163         if (u1.node[i] < u2.node[i])
 164             return -1;
 165         if (u1.node[i] > u2.node[i])
 166             return 1;
 167     }
 168     return 0;
 169
 170 }
 171
 172 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */