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/* GPRS utility functions */
/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
* (C) 2010-2014 by On-Waves
* (C) 2013 by Holger Hans Peter Freyther
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <openbsc/gprs_utils.h>
#include <osmocom/core/msgb.h>
#include <osmocom/gprs/gprs_ns.h>
#include <string.h>
/* FIXME: this needs to go to libosmocore/msgb.c */
struct msgb *gprs_msgb_copy(const struct msgb *msg, const char *name)
{
struct libgb_msgb_cb *old_cb, *new_cb;
struct msgb *new_msg;
new_msg = msgb_alloc(msg->data_len, name);
if (!new_msg)
return NULL;
/* copy data */
memcpy(new_msg->_data, msg->_data, new_msg->data_len);
/* copy header */
new_msg->len = msg->len;
new_msg->data += msg->data - msg->_data;
new_msg->head += msg->head - msg->_data;
new_msg->tail += msg->tail - msg->_data;
new_msg->l1h = new_msg->_data + (msg->l1h - msg->_data);
new_msg->l2h = new_msg->_data + (msg->l2h - msg->_data);
new_msg->l3h = new_msg->_data + (msg->l3h - msg->_data);
new_msg->l4h = new_msg->_data + (msg->l4h - msg->_data);
/* copy GB specific data */
old_cb = LIBGB_MSGB_CB(msg);
new_cb = LIBGB_MSGB_CB(new_msg);
new_cb->bssgph = new_msg->_data + (old_cb->bssgph - msg->_data);
new_cb->llch = new_msg->_data + (old_cb->llch - msg->_data);
/* bssgp_cell_id is a pointer into the old msgb, so we need to make
* it a pointer into the new msgb */
new_cb->bssgp_cell_id = new_msg->_data + (old_cb->bssgp_cell_id - msg->_data);
new_cb->nsei = old_cb->nsei;
new_cb->bvci = old_cb->bvci;
new_cb->tlli = old_cb->tlli;
return new_msg;
}
/* TODO: Move this to libosmocore/msgb.c */
int gprs_msgb_resize_area(struct msgb *msg, uint8_t *area,
size_t old_size, size_t new_size)
{
int rc;
uint8_t *rest = area + old_size;
int rest_len = msg->len - old_size - (area - msg->data);
int delta_size = (int)new_size - (int)old_size;
if (delta_size == 0)
return 0;
if (delta_size > 0) {
rc = msgb_trim(msg, msg->len + delta_size);
if (rc < 0)
return rc;
}
memmove(area + new_size, area + old_size, rest_len);
if (msg->l1h >= rest)
msg->l1h += delta_size;
if (msg->l2h >= rest)
msg->l2h += delta_size;
if (msg->l3h >= rest)
msg->l3h += delta_size;
if (msg->l4h >= rest)
msg->l4h += delta_size;
if (delta_size < 0)
msgb_trim(msg, msg->len + delta_size);
return 0;
}
/* TODO: Move these conversion functions to a utils file. */
/**
* out_str needs to have rest_chars amount of bytes or 1 whatever is bigger.
*/
char * gprs_apn_to_str(char *out_str, const uint8_t *apn_enc, size_t rest_chars)
{
char *str = out_str;
while (rest_chars > 0 && apn_enc[0]) {
size_t label_size = apn_enc[0];
if (label_size + 1 > rest_chars)
return NULL;
memmove(str, apn_enc + 1, label_size);
str += label_size;
rest_chars -= label_size + 1;
apn_enc += label_size + 1;
if (rest_chars)
*(str++) = '.';
}
str[0] = '\0';
return out_str;
}
int gprs_str_to_apn(uint8_t *apn_enc, size_t max_len, const char *str)
{
uint8_t *last_len_field;
int len;
/* Can we even write the length field to the output? */
if (max_len == 0)
return -1;
/* Remember where we need to put the length once we know it */
last_len_field = apn_enc;
len = 1;
apn_enc += 1;
while (str[0]) {
if (len >= max_len)
return -1;
if (str[0] == '.') {
*last_len_field = (apn_enc - last_len_field) - 1;
last_len_field = apn_enc;
} else {
*apn_enc = str[0];
}
apn_enc += 1;
str += 1;
len += 1;
}
*last_len_field = (apn_enc - last_len_field) - 1;
return len;
}
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