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
76
77
78
79
80
81
82
|
/*
* 0xFFFF - Open Free Fiasco Firmware Flasher
* Copyright (C) 2007-2009 pancake <pancake@youterm.com>
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <string.h>
#include "hash.h"
usho do_hash(usho *b, int len)
{
usho result = 0;
for(len>>=1;len--;b=b+1)
result^=b[0];
return result;
}
usho do_hash_file(const char *filename, const char *type)
{
unsigned char buf[BSIZE];
FILE *fd = fopen(filename, "r");
usho hash = 0;
int align = 0;
int size;
int ret;
if (fd == NULL) {
fprintf(stderr, "ERROR: File '%s' not found.\n", filename);
return -1;
}
do {
ret = fread(&buf, 1, BSIZE, fd);
if (ret == -1)
return 0;
hash ^= do_hash((usho *)&buf, ret);
} while(ret);
size = ftell(fd);
fclose(fd);
/* mmc and kernel image must be aligned */
if (type) {
if (strcmp(type, "mmc") == 0)
align = ((size >> 8) + 1) << 8;
else if (strcmp(type, "kernel") == 0)
align = ((size >> 7) + 1) << 7;
}
if (align) {
printf("align from %d to %d\n", size, align);
buf[0] = 0xff;
while (size < align) {
hash ^= do_hash((usho *)&buf, 1);
++size;
}
}
return hash;
}
#if 0
main()
{
usho us = do_hash_file("zImage");
unsigned char *h= (unsigned char *)&us;
printf("%x %x\n",h[0],h[1]);
}
#endif
|
