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 #include "common/macros.h"
  27
  28 /*
  29  * On macOS, we need a dummy symbol so that the linker won't
  30  * complain of an empty table of contents.
  31  */
  32 BT_HIDDEN
  33 int bt_uuid_dummy_symbol;
  34 #endif /* __APPLE__ */
  35
  36 #ifdef __MINGW32__
  37
  38 #include <rpc.h>
  39 #include <stdlib.h>
  40 #include "compat/uuid.h"
  41
  42 /* MinGW does not provide byteswap - implement our own version. */
  43 static
  44 void swap(unsigned char *ptr, unsigned int i, unsigned int j)
  45 {
  46         unsigned char tmp;
  47
  48         tmp = ptr[i];
  49         ptr[i] = ptr[j];
  50         ptr[j] = tmp;
  51 }
  52
  53 static
  54 void fix_uuid_endian(unsigned char * ptr)
  55 {
  56         swap(ptr, 0, 3);
  57         swap(ptr, 1, 2);
  58         swap(ptr, 4, 5);
  59         swap(ptr, 6, 7);
  60 }
  61
  62 int bt_uuid_generate(unsigned char *uuid_out)
  63 {
  64         RPC_STATUS status;
  65
  66         status = UuidCreate((UUID *) uuid_out);
  67         if (status == RPC_S_OK)
  68                 return 0;
  69         else
  70                 return -1;
  71 }
  72
  73 int bt_uuid_unparse(const unsigned char *uuid_in, char *str_out)
  74 {
  75         RPC_STATUS status;
  76         unsigned char *alloc_str;
  77         int ret;
  78         unsigned char copy_of_uuid_in[BABELTRACE_UUID_LEN];
  79
  80         /* make a modifyable copy of uuid_in */
  81         memcpy(copy_of_uuid_in, uuid_in, BABELTRACE_UUID_LEN);
  82
  83         fix_uuid_endian(copy_of_uuid_in);
  84         status = UuidToString((UUID *) copy_of_uuid_in, &alloc_str);
  85
  86         if (status == RPC_S_OK) {
  87                 strncpy(str_out, (char *) alloc_str, BABELTRACE_UUID_STR_LEN);
  88                 str_out[BABELTRACE_UUID_STR_LEN - 1] = '\0';
  89                 ret = 0;
  90         } else {
  91                 ret = -1;
  92         }
  93         RpcStringFree(&alloc_str);
  94         return ret;
  95 }
  96
  97 int bt_uuid_parse(const char *str_in, unsigned char *uuid_out)
  98 {
  99         RPC_STATUS status;
 100
 101         status = UuidFromString((unsigned char *) str_in,
 102                         (UUID *) uuid_out);
 103         fix_uuid_endian(uuid_out);
 104
 105         if (status == RPC_S_OK)
 106                 return 0;
 107         else
 108                 return -1;
 109 }
 110
 111 int bt_uuid_compare(const unsigned char *uuid_a,
 112                 const unsigned char *uuid_b)
 113 {
 114         RPC_STATUS status;
 115
 116         return !UuidCompare((UUID *) uuid_a, (UUID *) uuid_b, &status) ? 0 : -1;
 117 }
 118
 119 #endif