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 #ifdef __APPLE__
  26 /*
  27  * On macOS, we need a dummy symbol so that the linker won't
  28  * complain of an empty table of contents.
  29  */
  30 BT_HIDDEN
  31 int bt_uuid_dummy_symbol;
  32 #endif /* __APPLE__ */
  33
  34 #ifdef __MINGW32__
  35
  36 #include <rpc.h>
  37 #include <stdlib.h>
  38 #include "compat/uuid.h"
  39
  40 /* MinGW does not provide byteswap - implement our own version. */
  41 static
  42 void swap(unsigned char *ptr, unsigned int i, unsigned int j)
  43 {
  44         unsigned char tmp;
  45
  46         tmp = ptr[i];
  47         ptr[i] = ptr[j];
  48         ptr[j] = tmp;
  49 }
  50
  51 static
  52 void fix_uuid_endian(unsigned char * ptr)
  53 {
  54         swap(ptr, 0, 3);
  55         swap(ptr, 1, 2);
  56         swap(ptr, 4, 5);
  57         swap(ptr, 6, 7);
  58 }
  59
  60 int bt_uuid_generate(unsigned char *uuid_out)
  61 {
  62         RPC_STATUS status;
  63
  64         status = UuidCreate((UUID *) uuid_out);
  65         if (status == RPC_S_OK)
  66                 return 0;
  67         else
  68                 return -1;
  69 }
  70
  71 int bt_uuid_unparse(const unsigned char *uuid_in, char *str_out)
  72 {
  73         RPC_STATUS status;
  74         unsigned char *alloc_str;
  75         int ret;
  76         unsigned char copy_of_uuid_in[BABELTRACE_UUID_LEN];
  77
  78         /* make a modifyable copy of uuid_in */
  79         memcpy(copy_of_uuid_in, uuid_in, BABELTRACE_UUID_LEN);
  80
  81         fix_uuid_endian(copy_of_uuid_in);
  82         status = UuidToString((UUID *) copy_of_uuid_in, &alloc_str);
  83
  84         if (status == RPC_S_OK) {
  85                 strncpy(str_out, (char *) alloc_str, BABELTRACE_UUID_STR_LEN);
  86                 str_out[BABELTRACE_UUID_STR_LEN - 1] = '\0';
  87                 ret = 0;
  88         } else {
  89                 ret = -1;
  90         }
  91         RpcStringFree(&alloc_str);
  92         return ret;
  93 }
  94
  95 int bt_uuid_parse(const char *str_in, unsigned char *uuid_out)
  96 {
  97         RPC_STATUS status;
  98
  99         status = UuidFromString((unsigned char *) str_in,
 100                         (UUID *) uuid_out);
 101         fix_uuid_endian(uuid_out);
 102
 103         if (status == RPC_S_OK)
 104                 return 0;
 105         else
 106                 return -1;
 107 }
 108
 109 int bt_uuid_compare(const unsigned char *uuid_a,
 110                 const unsigned char *uuid_b)
 111 {
 112         RPC_STATUS status;
 113
 114         return !UuidCompare((UUID *) uuid_a, (UUID *) uuid_b, &status) ? 0 : -1;
 115 }
 116
 117 #endif