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