From 7127b0295eed1edea29ea88b352c2cfbff59c610 Mon Sep 17 00:00:00 2001 From: Holger Hans Peter Freyther Date: Mon, 4 Aug 2014 11:52:52 +0200 Subject: gprs: Create a gprs_utils file and move to be shared code in there We intend to move some of these routines to libosmocore but to avoid a feature symbol clash we are prefixing these routines with gprs_. Done with Jacob --- openbsc/src/gprs/gprs_utils.c | 152 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 openbsc/src/gprs/gprs_utils.c (limited to 'openbsc/src/gprs/gprs_utils.c') diff --git a/openbsc/src/gprs/gprs_utils.c b/openbsc/src/gprs/gprs_utils.c new file mode 100644 index 000000000..8b82f2506 --- /dev/null +++ b/openbsc/src/gprs/gprs_utils.c @@ -0,0 +1,152 @@ +/* GPRS utility functions */ + +/* (C) 2010 by Harald Welte + * (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 . + * + */ +#include + +#include +#include + +#include + +/* 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. */ +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, const char *str, size_t max_chars) +{ + uint8_t *last_len_field = apn_enc; + int len = 1; + apn_enc += 1; + + while (str[0]) { + 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; + if (len > max_chars) + return -1; + } + + *last_len_field = (apn_enc - last_len_field) - 1; + + return len; +} + -- cgit v1.2.3