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|
/*****************************************************************
|
| AP4 - Posix Random Byte Generator implementation
|
| Copyright 2002-2015 Axiomatic Systems, LLC
|
|
| This file is part of Bento4/AP4 (MP4 Atom Processing Library).
|
| Unless you have obtained Bento4 under a difference license,
| this version of Bento4 is Bento4|GPL.
| Bento4|GPL is free software; you can redistribute it and/or modify
| it under the terms of the GNU General Public License as published by
| the Free Software Foundation; either version 2, or (at your option)
| any later version.
|
| Bento4|GPL is distributed in the hope that it will be useful,
| but WITHOUT ANY WARRANTY; without even the implied warranty of
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
| GNU General Public License for more details.
|
| You should have received a copy of the GNU General Public License
| along with Bento4|GPL; see the file COPYING. If not, write to the
| Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
| 02111-1307, USA.
|
****************************************************************/
/*----------------------------------------------------------------------
| includes
+---------------------------------------------------------------------*/
#include <unistd.h>
#include <fcntl.h>
#include "Ap4Utils.h"
/*----------------------------------------------------------------------
| AP4_System_GenerateRandomBytes
+---------------------------------------------------------------------*/
AP4_Result
AP4_System_GenerateRandomBytes(AP4_UI08* buffer, AP4_Size buffer_size)
{
AP4_SetMemory(buffer, 0, buffer_size);
int random = open("/dev/urandom", O_RDONLY);
if (random < 0) {
return AP4_FAILURE;
}
AP4_Result result = AP4_SUCCESS;
while (buffer_size) {
int nb_read = (int)read(random, buffer, buffer_size);
if (nb_read <= 0) {
result = AP4_ERROR_READ_FAILED;
goto end;
}
if ((AP4_Size)nb_read > buffer_size) {
result = AP4_ERROR_INTERNAL;
goto end;
}
buffer_size -= nb_read;
buffer += nb_read;
}
end:
close(random);
return result;
}
|
