/* Read packet header and data for random access. */
static gboolean visual_seek_read(wtap *wth, gint64 seek_off,
struct wtap_pkthdr *phdr, Buffer *buf, int *err, gchar **err_info)
{
/* Seek to the packet header */
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* Read the packet. */
if (!visual_read_packet(wth, wth->random_fh, phdr, buf, err, err_info)) {
if (*err == 0)
*err = WTAP_ERR_SHORT_READ;
return FALSE;
}
return TRUE;
}
/* Read the next available packet from the file. This is called
in a loop to sequentially read the entire file one time. After
the file has been read once, any Future access to the packets is
done through seek_read. */
static gboolean visual_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
struct visual_read_info *visual = (struct visual_read_info *)wth->priv;
/* Check for the end of the packet data. Note that a check for file EOF
will not work because there are index values stored after the last
packet's data. */
if (visual->current_pkt > visual->num_pkts)
{
*err = 0; /* it's just an EOF, not an error */
return FALSE;
}
visual->current_pkt++;
*data_offset = file_tell(wth->fh);
return visual_read_packet(wth, wth->fh, &wth->phdr, wth->frame_buffer,
err, err_info);
}
