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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' };
static const guint8 mp4_magic_sidx[] = { 's', 'i', 'd', 'x' };
static const guint8 mp4_magic_styp[] = { 's', 't', 'y', 'p' };
static int mp4_file_type_subtype = -1;
void register_mp4(void);
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)) &&
memcmp(magic_buf + 4, mp4_magic_sidx, sizeof (mp4_magic_sidx)) &&
memcmp(magic_buf + 4, mp4_magic_styp, sizeof (mp4_magic_styp)))
return WTAP_OPEN_NOT_MINE;
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
return WTAP_OPEN_ERROR;
wth->file_type_subtype = mp4_file_type_subtype;
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;
}
static const struct supported_block_type mp4_blocks_supported[] = {
/*
* This is a file format that we dissect, so we provide
* only one "packet" with the file's contents, and don't
* support any options.
*/
{ WTAP_BLOCK_PACKET, ONE_BLOCK_SUPPORTED, NO_OPTIONS_SUPPORTED }
};
static const struct file_type_subtype_info mp4_info = {
"MP4 media", "mp4", "mp4", NULL,
FALSE, BLOCKS_SUPPORTED(mp4_blocks_supported),
NULL, NULL, NULL
};
void register_mp4(void)
{
mp4_file_type_subtype = wtap_register_file_type_subtype(&mp4_info);
/*
* Register name for backwards compatibility with the
* wtap_filetypes table in Lua.
*/
wtap_register_backwards_compatibility_lua_name("MP4",
mp4_file_type_subtype);
}
/*
* 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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