1 /*****************************************************************
2 |
3 | AP4 - Win32 Random Byte Generator implementation
4 |
5 | Copyright 2002-2011 Axiomatic Systems, LLC
6 |
7 |
8 | This file is part of Bento4/AP4 (MP4 Atom Processing Library).
9 |
10 | Unless you have obtained Bento4 under a difference license,
11 | this version of Bento4 is Bento4|GPL.
12 | Bento4|GPL is free software; you can redistribute it and/or modify
13 | it under the terms of the GNU General Public License as published by
14 | the Free Software Foundation; either version 2, or (at your option)
15 | any later version.
16 |
17 | Bento4|GPL is distributed in the hope that it will be useful,
18 | but WITHOUT ANY WARRANTY; without even the implied warranty of
19 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 | GNU General Public License for more details.
21 |
22 | You should have received a copy of the GNU General Public License
23 | along with Bento4|GPL; see the file COPYING. If not, write to the
24 | Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
25 | 02111-1307, USA.
26 |
27 ****************************************************************/
28
29 /*----------------------------------------------------------------------
30 | includes
31 +---------------------------------------------------------------------*/
32 #define _CRT_RAND_S
33 #include <stdlib.h>
34
35 #include "Ap4Utils.h"
36
37 /*----------------------------------------------------------------------
38 | AP4_System_GenerateRandomBytes
39 +---------------------------------------------------------------------*/
40 AP4_Result
AP4_System_GenerateRandomBytes(AP4_UI08 * buffer,AP4_Size buffer_size)41 AP4_System_GenerateRandomBytes(AP4_UI08* buffer, AP4_Size buffer_size)
42 {
43 AP4_SetMemory(buffer, 0, buffer_size);
44
45 while (buffer_size) {
46 unsigned int r;
47 errno_t result = rand_s(&r);
48 if (result != 0) return AP4_FAILURE;
49
50 unsigned int chunk = buffer_size < sizeof(r) ? buffer_size : sizeof(r);
51 memcpy(buffer, (void*)&r, chunk);
52 buffer += chunk;
53 buffer_size -= chunk;
54 }
55
56 return AP4_SUCCESS;
57 }
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