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/*****************************************************************************
* lasts.c: give the duration of an aux file
*****************************************************************************
* Copyright (C) 2009, 2011 VideoLAN
* $Id$
*
* Authors: Christophe Massiot <massiot@via.ecp.fr>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <inttypes.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
/*****************************************************************************
* Entry point
*****************************************************************************/
int main(int i_argc, char **ppsz_argv)
{
uint64_t i_stc0, i_stcn;
uint8_t p_aux[8];
int i_fd;
if (i_argc != 2 || !strcmp(ppsz_argv[1], "-h") ||
!strcmp(ppsz_argv[1], "--help"))
{
fprintf(stderr, "Usage: lasts <aux file>\n");
exit(EXIT_FAILURE);
}
i_fd = open(ppsz_argv[1], O_RDONLY);
if (i_fd == -1)
{
fprintf(stderr, "cannot open (%m)\n");
exit(EXIT_FAILURE);
}
if (read(i_fd, p_aux, sizeof(p_aux)) != sizeof(p_aux))
{
fprintf(stderr, "cannot read (%m)\n");
close(i_fd);
exit(EXIT_FAILURE);
}
i_stc0 = ((uint64_t)p_aux[0] << 56)
| ((uint64_t)p_aux[1] << 48)
| ((uint64_t)p_aux[2] << 40)
| ((uint64_t)p_aux[3] << 32)
| ((uint64_t)p_aux[4] << 24)
| ((uint64_t)p_aux[5] << 16)
| ((uint64_t)p_aux[6] << 8)
| ((uint64_t)p_aux[7] << 0);
if (lseek(i_fd, -(off_t)sizeof(p_aux), SEEK_END) == -1)
{
fprintf(stderr, "cannot lseek (%m)\n");
close(i_fd);
exit(EXIT_FAILURE);
}
if (read(i_fd, p_aux, sizeof(p_aux)) != sizeof(p_aux))
{
fprintf(stderr, "cannot read (%m)\n");
close(i_fd);
exit(EXIT_FAILURE);
}
close(i_fd);
i_stcn = ((uint64_t)p_aux[0] << 56)
| ((uint64_t)p_aux[1] << 48)
| ((uint64_t)p_aux[2] << 40)
| ((uint64_t)p_aux[3] << 32)
| ((uint64_t)p_aux[4] << 24)
| ((uint64_t)p_aux[5] << 16)
| ((uint64_t)p_aux[6] << 8)
| ((uint64_t)p_aux[7] << 0);
printf( "%"PRIu64"\n", i_stcn - i_stc0);
exit(EXIT_SUCCESS);
}
|
