1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/*
* Common "util" functions
* This file is part of the dmidecode project.
*
* (C) 2002-2003 Jean Delvare <khali@linux-fr>
*
* This program 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 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* For the avoidance of doubt the "preferred form" of this code is one which
* is in an open unpatent encumbered format. Where cryptographic key signing
* forms part of the process of creating an executable the information
* including keys needed to generate an equivalently functional executable
* are deemed to be part of the source code.
*
*/
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include "types.h"
#include "util.h"
int myread(int fd, u8 *buf, size_t count, const char *prefix)
{
ssize_t r=1;
size_t r2=0;
while(r2!=count && r!=0)
{
r=read(fd, buf+r2, count-r2);
if(r==-1)
{
if(errno!=EINTR)
{
close(fd);
perror(prefix);
return -1;
}
}
else
r2+=r;
}
if(r2!=count)
{
close(fd);
fprintf(stderr, "%s: Unexpected end of file\n", prefix);
return -1;
}
return 0;
}
int checksum(const u8 *buf, size_t len)
{
u8 sum=0;
size_t a;
for(a=0; a<len; a++)
sum+=buf[a];
return (sum==0);
}
|
