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/* mp4.c
*
* MP4 (ISO/IEC 14496-12) file format decoder for the Wiretap library.
*
* Wiretap Library
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "mp4.h"
#include <string.h>
#include "file_wrappers.h"
#include "wtap-int.h"
static const guint8 mp4_magic[] = { 'f', 't', 'y', 'p' };
wtap_open_return_val
mp4_open(wtap *wth, int *err, gchar **err_info)
{
char magic_buf[8];
int bytes_read;
bytes_read = file_read(magic_buf, sizeof (magic_buf), wth->fh);
if (bytes_read < 0) {
*err = file_error(wth->fh, err_info);
return WTAP_OPEN_ERROR;
}
if (bytes_read == 0)
return WTAP_OPEN_NOT_MINE;
if (bytes_read == sizeof (magic_buf) &&
memcmp(magic_buf + 4, mp4_magic, sizeof (mp4_magic)))
return WTAP_OPEN_NOT_MINE;
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
return WTAP_OPEN_ERROR;
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_MP4;
wth->file_encap = WTAP_ENCAP_MP4;
wth->file_tsprec = WTAP_TSPREC_SEC;
wth->subtype_read = wtap_full_file_read;
wth->subtype_seek_read = wtap_full_file_seek_read;
wth->snapshot_length = 0;
return WTAP_OPEN_MINE;
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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