/* Used to read packets in random-access fashion */
static gboolean
dbs_etherwatch_seek_read (wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr,
guint8 *pd, int len, int *err, gchar **err_info)
{
union wtap_pseudo_header *pseudo_header = &phdr->pseudo_header;
int pkt_len;
if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
return FALSE;
pkt_len = parse_dbs_etherwatch_packet(NULL, wth->random_fh, pd, err,
err_info);
if (pkt_len != len) {
if (pkt_len != -1) {
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("dbs_etherwatch: packet length %d doesn't match requested length %d",
pkt_len, len);
}
return FALSE;
}
/*
* We don't have an FCS in this frame.
*/
pseudo_header->eth.fcs_len = 0;
return TRUE;
}
/* Find the next packet and parse it; called from wtap_read(). */
static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
gint64 offset;
guint8 *buf;
int pkt_len;
/* Find the next packet */
offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
if (offset < 1)
return FALSE;
/* Make sure we have enough room for the packet */
buffer_assure_space(wth->frame_buffer, DBS_ETHERWATCH_MAX_PACKET_LEN);
buf = buffer_start_ptr(wth->frame_buffer);
/* Parse the packet */
pkt_len = parse_dbs_etherwatch_packet(wth, wth->fh, buf, err, err_info);
if (pkt_len == -1)
return FALSE;
/*
* We don't have an FCS in this frame.
*/
wth->phdr.pseudo_header.eth.fcs_len = 0;
*data_offset = offset;
return TRUE;
}
/* Used to read packets in random-access fashion */
static gboolean
dbs_etherwatch_seek_read(wtap *wth, gint64 seek_off,
wtap_rec *rec, Buffer *buf, int *err, gchar **err_info)
{
if (file_seek(wth->random_fh, seek_off - 1, SEEK_SET, err) == -1)
return FALSE;
return parse_dbs_etherwatch_packet(rec, wth->random_fh, buf, err,
err_info);
}
/* Find the next packet and parse it; called from wtap_read(). */
static gboolean dbs_etherwatch_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
gint64 offset;
/* Find the next packet */
offset = dbs_etherwatch_seek_next_packet(wth, err, err_info);
if (offset < 1)
return FALSE;
*data_offset = offset;
/* Parse the packet */
return parse_dbs_etherwatch_packet(&wth->rec, wth->fh,
wth->rec_data, err, err_info);
}
