src/tests/stripnul.c

   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, write to the Free Software
  16   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  17   USA.
  18 ***/
  19
  20 #ifdef HAVE_CONFIG_H
  21 #include <config.h>
  22 #endif
  23
  24 #include <stdio.h>
  25 #include <string.h>
  26 #include <inttypes.h>
  27
  28 #include <pulse/xmalloc.h>
  29 #include <pulsecore/macro.h>
  30
  31 int main(int argc, char *argv[]) {
  32     FILE *i, *o;
  33     size_t granularity;
  34     pa_bool_t found;
  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_se((i = (argc >= 3) ? fopen(argv[2], "r") : stdin));
  40     pa_assert_se((o = (argc >= 4) ? fopen(argv[3], "w") : stdout));
  41
  42     zero = pa_xmalloc0(granularity);
  43
  44     for (;;) {
  45         uint8_t buffer[16*1024], *p;
  46         size_t k;
  47
  48         k = fread(buffer, granularity, sizeof(buffer)/granularity, i);
  49
  50         if (k <= 0)
  51             break;
  52
  53         if (found)
  54             pa_assert_se(fwrite(buffer, granularity, k, o) == k);
  55         else {
  56             for (p = buffer; ((size_t) (p-buffer)/granularity) < k; p += granularity)
  57                 if (memcmp(p, zero, granularity)) {
  58                     size_t left;
  59                     found = TRUE;
  60                     left = (size_t) (k - (size_t) (p-buffer)/granularity);
  61                     pa_assert_se(fwrite(p, granularity, left, o) == left);
  62                     break;
  63                 }
  64         }
  65     }
  66
  67     fflush(o);
  68
  69     return 0;
  70 }