static gboolean
i4btrace_seek_read(wtap *wth, gint64 seek_off, struct wtap_pkthdr *phdr,
guint8 *pd, int length, int *err, gchar **err_info)
{
int ret;
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* Read and process the record header. */
ret = i4b_process_rec_header(wth, wth->random_fh, phdr, err, err_info);
if (ret <= 0) {
/* Read error or EOF */
if (ret == 0) {
/* EOF means "short read" in random-access mode */
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
/*
* Read the packet data.
*/
return i4b_read_rec_data(wth->random_fh, pd, length, err, err_info);
}
static gboolean
i4btrace_seek_read(wtap *wth, gint64 seek_off,
union wtap_pseudo_header *pseudo_header, guint8 *pd, int length,
int *err, gchar **err_info)
{
int ret;
i4b_trace_hdr_t hdr;
if (file_seek(wth->random_fh, seek_off, SEEK_SET, err) == -1)
return FALSE;
/* Read record header. */
ret = i4b_read_rec_header(wth->random_fh, &hdr, err, err_info);
if (ret <= 0) {
/* Read error or EOF */
if (ret == 0) {
/* EOF means "short read" in random-access mode */
*err = WTAP_ERR_SHORT_READ;
}
return FALSE;
}
i4b_byte_swap_header(wth, &hdr);
i4b_set_pseudo_header(&hdr, pseudo_header);
/*
* Read the packet data.
*/
return i4b_read_rec_data(wth->random_fh, pd, length, err, err_info);
}
/* Read the next packet */
static gboolean i4btrace_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
int ret;
void *bufp;
*data_offset = file_tell(wth->fh);
/* Read and process the record header. */
ret = i4b_process_rec_header(wth, wth->fh, &wth->phdr, err, err_info);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, wth->phdr.caplen);
bufp = buffer_start_ptr(wth->frame_buffer);
if (!i4b_read_rec_data(wth->fh, (guint8 *)bufp, wth->phdr.caplen, err, err_info))
return FALSE; /* Read error */
return TRUE;
}
/* Read the next packet */
static gboolean i4btrace_read(wtap *wth, int *err, gchar **err_info,
gint64 *data_offset)
{
int ret;
i4b_trace_hdr_t hdr;
guint32 length;
void *bufp;
/* Read record header. */
*data_offset = file_tell(wth->fh);
ret = i4b_read_rec_header(wth->fh, &hdr, err, err_info);
if (ret <= 0) {
/* Read error or EOF */
return FALSE;
}
i4b_byte_swap_header(wth, &hdr);
if (hdr.length < sizeof(hdr)) {
*err = WTAP_ERR_BAD_FILE; /* record length < header! */
*err_info = g_strdup_printf("i4btrace: record length %u < header length %lu",
hdr.length, (unsigned long)sizeof(hdr));
return FALSE;
}
length = hdr.length - (guint32)sizeof(hdr);
if (length > WTAP_MAX_PACKET_SIZE) {
/*
* Probably a corrupt capture file; don't blow up trying
* to allocate space for an immensely-large packet.
*/
*err = WTAP_ERR_BAD_FILE;
*err_info = g_strdup_printf("i4btrace: File has %u-byte packet, bigger than maximum of %u",
length, WTAP_MAX_PACKET_SIZE);
return FALSE;
}
wth->phdr.presence_flags = WTAP_HAS_TS;
wth->phdr.len = length;
wth->phdr.caplen = length;
wth->phdr.ts.secs = hdr.ts_sec;
wth->phdr.ts.nsecs = hdr.ts_usec * 1000;
/*
* Read the packet data.
*/
buffer_assure_space(wth->frame_buffer, length);
bufp = buffer_start_ptr(wth->frame_buffer);
if (!i4b_read_rec_data(wth->fh, bufp, length, err, err_info))
return FALSE; /* Read error */
switch (hdr.type) {
case TRC_CH_I:
/*
* XXX - what is it? It's probably not WTAP_ENCAP_NULL,
* as that means it has a 4-byte AF_ type as the
* encapsulation header.
*/
wth->phdr.pkt_encap = WTAP_ENCAP_NULL;
break;
case TRC_CH_D:
case TRC_CH_B1:
case TRC_CH_B2:
/*
* D or B channel.
*/
wth->phdr.pkt_encap = WTAP_ENCAP_ISDN;
break;
}
i4b_set_pseudo_header(&hdr, &wth->pseudo_header);
return TRUE;
}
