aarch64: Add assembly support for -fsanitize=hwaddress tagged globals.
[libav.git] / tools / trasher.c
1 /*
2 * Copyright (c) 2007 Michael Niedermayer
3 *
4 * This file is part of Libav.
5 *
6 * Libav is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * Libav is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <inttypes.h>
24 #include <errno.h>
25 #include <string.h>
26
27 static uint32_t state;
28 static uint32_t ran(void)
29 {
30 return state = state * 1664525 + 1013904223;
31 }
32
33 int main(int argc, char **argv)
34 {
35 FILE *f;
36 int count, maxburst, length;
37
38 if (argc < 5) {
39 printf("USAGE: trasher <filename> <count> <maxburst> <seed>\n");
40 return 1;
41 }
42
43 f = fopen(argv[1], "rb+");
44 if (!f) {
45 perror(argv[1]);
46 return 2;
47 }
48 count = atoi(argv[2]);
49 maxburst = atoi(argv[3]);
50 state = atoi(argv[4]);
51
52 fseek(f, 0, SEEK_END);
53 length = ftell(f);
54 fseek(f, 0, SEEK_SET);
55
56 while (count--) {
57 int burst = 1 + ran() * (uint64_t) (abs(maxburst) - 1) / UINT32_MAX;
58 int pos = ran() * (uint64_t) length / UINT32_MAX;
59 fseek(f, pos, SEEK_SET);
60
61 if (maxburst < 0)
62 burst = -maxburst;
63
64 if (pos + burst > length)
65 continue;
66
67 while (burst--) {
68 int val = ran() * 256ULL / UINT32_MAX;
69
70 if (maxburst < 0)
71 val = 0;
72
73 fwrite(&val, 1, 1, f);
74 }
75 }
76
77 return 0;
78 }