src/compat/uuid.c

   1 /*
   2  * compat/compat_uuid.h
   3  *
   4  * Copyright (C) 2013   Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 #define BT_LOG_TAG "COMPAT-UUID"
  26 #include "logging.h"
  27
  28 #ifdef __APPLE__
  29 /*
  30  * On macOS, we need a dummy symbol so that the linker won't
  31  * complain of an empty table of contents.
  32  */
  33 BT_HIDDEN
  34 int bt_uuid_dummy_symbol;
  35 #endif /* __APPLE__ */
  36
  37 #ifdef __MINGW32__
  38
  39 #include <rpc.h>
  40 #include <stdlib.h>
  41 #include "compat/uuid.h"
  42
  43 /* MinGW does not provide byteswap - implement our own version. */
  44 static
  45 void swap(unsigned char *ptr, unsigned int i, unsigned int j)
  46 {
  47         unsigned char tmp;
  48
  49         tmp = ptr[i];
  50         ptr[i] = ptr[j];
  51         ptr[j] = tmp;
  52 }
  53
  54 static
  55 void fix_uuid_endian(unsigned char * ptr)
  56 {
  57         swap(ptr, 0, 3);
  58         swap(ptr, 1, 2);
  59         swap(ptr, 4, 5);
  60         swap(ptr, 6, 7);
  61 }
  62
  63 int bt_uuid_generate(unsigned char *uuid_out)
  64 {
  65         RPC_STATUS status;
  66
  67         status = UuidCreate((UUID *) uuid_out);
  68         if (status == RPC_S_OK)
  69                 return 0;
  70         else
  71                 return -1;
  72 }
  73
  74 int bt_uuid_unparse(const unsigned char *uuid_in, char *str_out)
  75 {
  76         RPC_STATUS status;
  77         unsigned char *alloc_str;
  78         int ret;
  79         unsigned char copy_of_uuid_in[BABELTRACE_UUID_LEN];
  80
  81         /* make a modifyable copy of uuid_in */
  82         memcpy(copy_of_uuid_in, uuid_in, BABELTRACE_UUID_LEN);
  83
  84         fix_uuid_endian(copy_of_uuid_in);
  85         status = UuidToString((UUID *) copy_of_uuid_in, &alloc_str);
  86
  87         if (status == RPC_S_OK) {
  88                 strncpy(str_out, (char *) alloc_str, BABELTRACE_UUID_STR_LEN);
  89                 str_out[BABELTRACE_UUID_STR_LEN - 1] = '\0';
  90                 ret = 0;
  91         } else {
  92                 ret = -1;
  93         }
  94         RpcStringFree(&alloc_str);
  95         return ret;
  96 }
  97
  98 int bt_uuid_parse(const char *str_in, unsigned char *uuid_out)
  99 {
 100         RPC_STATUS status;
 101
 102         status = UuidFromString((unsigned char *) str_in,
 103                         (UUID *) uuid_out);
 104         fix_uuid_endian(uuid_out);
 105
 106         if (status == RPC_S_OK)
 107                 return 0;
 108         else
 109                 return -1;
 110 }
 111
 112 int bt_uuid_compare(const unsigned char *uuid_a,
 113                 const unsigned char *uuid_b)
 114 {
 115         RPC_STATUS status;
 116
 117         return !UuidCompare((UUID *) uuid_a, (UUID *) uuid_b, &status) ? 0 : -1;
 118 }
 119
 120 #endif