int i4btrace_open(wtap *wth, int *err, gchar **err_info)
{
int bytes_read;
i4b_trace_hdr_t hdr;
gboolean byte_swapped = FALSE;
i4btrace_t *i4btrace;
/* I4B trace files have no magic in the header... Sigh */
errno = WTAP_ERR_CANT_READ;
bytes_read = file_read(&hdr, sizeof(hdr), wth->fh);
if (bytes_read != sizeof(hdr)) {
*err = file_error(wth->fh, err_info);
if (*err != 0 && *err != WTAP_ERR_SHORT_READ)
return -1;
return 0;
}
/* Silly heuristic... */
if (!I4B_HDR_IS_OK(hdr)) {
/*
* OK, try byte-swapping the header fields.
*/
hdr.length = BSWAP32(hdr.length);
hdr.unit = BSWAP32(hdr.unit);
hdr.type = BSWAP32(hdr.type);
hdr.dir = BSWAP32(hdr.dir);
hdr.trunc = BSWAP32(hdr.trunc);
if (!I4B_HDR_IS_OK(hdr)) {
/*
* It doesn't look valid in either byte order.
*/
return 0;
}
/*
* It looks valid byte-swapped, so assume it's a
* trace written in the opposite byte order.
*/
byte_swapped = TRUE;
}
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
return -1;
/* Get capture start time */
wth->file_type = WTAP_FILE_I4BTRACE;
i4btrace = (i4btrace_t *)g_malloc(sizeof(i4btrace_t));
wth->priv = (void *)i4btrace;
wth->subtype_read = i4btrace_read;
wth->subtype_seek_read = i4btrace_seek_read;
wth->snapshot_length = 0; /* not known */
i4btrace->byte_swapped = byte_swapped;
wth->file_encap = WTAP_ENCAP_ISDN;
wth->tsprecision = WTAP_FILE_TSPREC_USEC;
return 1;
}
wtap_open_return_val i4btrace_open(wtap *wth, int *err, gchar **err_info)
{
i4b_trace_hdr_t hdr;
gboolean byte_swapped = FALSE;
i4btrace_t *i4btrace;
/* I4B trace files have no magic in the header... Sigh */
if (!wtap_read_bytes(wth->fh, &hdr, sizeof(hdr), err, err_info)) {
if (*err != WTAP_ERR_SHORT_READ)
return WTAP_OPEN_ERROR;
return WTAP_OPEN_NOT_MINE;
}
/* Silly heuristic... */
if (!I4B_HDR_IS_OK(hdr)) {
/*
* OK, try byte-swapping the header fields.
*/
hdr.length = GUINT32_SWAP_LE_BE(hdr.length);
hdr.unit = GUINT32_SWAP_LE_BE(hdr.unit);
hdr.type = GUINT32_SWAP_LE_BE(hdr.type);
hdr.dir = GUINT32_SWAP_LE_BE(hdr.dir);
hdr.trunc = GUINT32_SWAP_LE_BE(hdr.trunc);
if (!I4B_HDR_IS_OK(hdr)) {
/*
* It doesn't look valid in either byte order.
*/
return WTAP_OPEN_NOT_MINE;
}
/*
* It looks valid byte-swapped, so assume it's a
* trace written in the opposite byte order.
*/
byte_swapped = TRUE;
}
if (file_seek(wth->fh, 0, SEEK_SET, err) == -1)
return WTAP_OPEN_ERROR;
/* Get capture start time */
wth->file_type_subtype = WTAP_FILE_TYPE_SUBTYPE_I4BTRACE;
i4btrace = (i4btrace_t *)g_malloc(sizeof(i4btrace_t));
wth->priv = (void *)i4btrace;
wth->subtype_read = i4btrace_read;
wth->subtype_seek_read = i4btrace_seek_read;
wth->snapshot_length = 0; /* not known */
i4btrace->byte_swapped = byte_swapped;
wth->file_encap = WTAP_ENCAP_ISDN;
wth->file_tsprec = WTAP_TSPREC_USEC;
return WTAP_OPEN_MINE;
}
