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
|
/***
This file is part of PulseAudio.
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published
by the Free Software Foundation; either version 2.1 of the License,
or (at your option) any later version.
PulseAudio 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 Lesser General Public License
along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <inttypes.h>
#include <pulse/xmalloc.h>
#include <pulsecore/macro.h>
#define MAX_BUFFER (16*1024)
int main(int argc, char *argv[]) {
FILE *i, *o;
size_t granularity;
bool found = false;
uint8_t *zero;
pa_assert_se(argc >= 2);
pa_assert_se((granularity = (size_t) atoi(argv[1])) >= 1);
pa_assert(granularity <= MAX_BUFFER);
pa_assert_se((i = (argc >= 3) ? fopen(argv[2], "r") : stdin));
pa_assert_se((o = (argc >= 4) ? fopen(argv[3], "w") : stdout));
zero = pa_xmalloc0(granularity);
for (;;) {
uint8_t buffer[MAX_BUFFER], *p;
size_t k;
k = fread(buffer, granularity, sizeof(buffer)/granularity, i);
if (k <= 0)
break;
if (found)
pa_assert_se(fwrite(buffer, granularity, k, o) == k);
else {
for (p = buffer; ((size_t) (p-buffer)/granularity) < k; p += granularity)
if (memcmp(p, zero, granularity)) {
size_t left;
found = true;
left = (size_t) (k - (size_t) (p-buffer)/granularity);
pa_assert_se(fwrite(p, granularity, left, o) == left);
break;
}
}
}
fflush(o);
return 0;
}
|
