1 /***
2 This file is part of PulseAudio.
3
4 PulseAudio is free software; you can redistribute it and/or modify
5 it under the terms of the GNU Lesser General Public License as published
6 by the Free Software Foundation; either version 2.1 of the License,
7 or (at your option) any later version.
8
9 PulseAudio is distributed in the hope that it will be useful, but
10 WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public License
15 along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
16 ***/
17
18 #ifdef HAVE_CONFIG_H
19 #include <config.h>
20 #endif
21
22 #include <stdio.h>
23 #include <string.h>
24 #include <inttypes.h>
25
26 #include <pulse/xmalloc.h>
27 #include <pulsecore/macro.h>
28
29 #define MAX_BUFFER (16*1024)
30
main(int argc,char * argv[])31 int main(int argc, char *argv[]) {
32 FILE *i, *o;
33 size_t granularity;
34 bool found = false;
35 uint8_t *zero;
36
37 pa_assert_se(argc >= 2);
38 pa_assert_se((granularity = (size_t) atoi(argv[1])) >= 1);
39 pa_assert(granularity <= MAX_BUFFER);
40 pa_assert_se((i = (argc >= 3) ? fopen(argv[2], "r") : stdin));
41 pa_assert_se((o = (argc >= 4) ? fopen(argv[3], "w") : stdout));
42
43 zero = pa_xmalloc0(granularity);
44
45 for (;;) {
46 uint8_t buffer[MAX_BUFFER], *p;
47 size_t k;
48
49 k = fread(buffer, granularity, sizeof(buffer)/granularity, i);
50
51 if (k <= 0)
52 break;
53
54 if (found)
55 pa_assert_se(fwrite(buffer, granularity, k, o) == k);
56 else {
57 for (p = buffer; ((size_t) (p-buffer)/granularity) < k; p += granularity)
58 if (memcmp(p, zero, granularity)) {
59 size_t left;
60 found = true;
61 left = (size_t) (k - (size_t) (p-buffer)/granularity);
62 pa_assert_se(fwrite(p, granularity, left, o) == left);
63 break;
64 }
65 }
66 }
67
68 fflush(o);
69
70 return 0;
71 }
72