| /* GPRS SNDCP header compression entity management tools */ |
| |
| /* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de> |
| * All Rights Reserved |
| * |
| * Author: Philipp Maier |
| * |
| * 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/>. |
| */ |
| |
| #pragma once |
| |
| #include <stdint.h> |
| #include <osmocom/core/linuxlist.h> |
| #include <osmocom/sgsn/gprs_sndcp_xid.h> |
| |
| /* Header / Data compression entity */ |
| struct gprs_sndcp_comp { |
| struct llist_head list; |
| |
| /* Serves as an ID in case we want to delete this entity later */ |
| unsigned int entity; /* see also: 6.5.1.1.3 and 6.6.1.1.3 */ |
| |
| /* Specifies to which NSAPIs the compression entity is assigned */ |
| uint8_t nsapi_len; /* Number of applicable NSAPIs (default 0) */ |
| uint8_t nsapi[MAX_NSAPI]; /* Applicable NSAPIs (default 0) */ |
| |
| /* Assigned pcomp values */ |
| uint8_t comp_len; /* Number of contained PCOMP / DCOMP values */ |
| uint8_t comp[MAX_COMP]; /* see also: 6.5.1.1.5 and 6.6.1.1.5 */ |
| |
| /* Algorithm parameters */ |
| union gprs_sndcp_comp_algo algo; |
| enum gprs_sndcp_xid_param_types compclass; /* See gprs_sndcp_xid.h/c */ |
| void *state; /* Algorithm status and parameters */ |
| }; |
| |
| #define MAX_COMP 16 /* Maximum number of possible pcomp/dcomp values */ |
| #define MAX_NSAPI 11 /* Maximum number usable NSAPIs */ |
| |
| /* Allocate a compression enitiy list */ |
| struct llist_head *gprs_sndcp_comp_alloc(const void *ctx); |
| |
| /* Free a compression entitiy list */ |
| void gprs_sndcp_comp_free(struct llist_head *comp_entities); |
| |
| /* Delete a compression entity */ |
| void gprs_sndcp_comp_delete(struct llist_head *comp_entities, unsigned int entity); |
| |
| /* Create and Add a new compression entity |
| * (returns a pointer to the compression entity that has just been created) */ |
| struct gprs_sndcp_comp *gprs_sndcp_comp_add(const void *ctx, |
| struct llist_head *comp_entities, |
| const struct gprs_sndcp_comp_field |
| *comp_field); |
| |
| /* Find which compression entity handles the specified pcomp/dcomp */ |
| struct gprs_sndcp_comp *gprs_sndcp_comp_by_comp(const struct llist_head |
| *comp_entities, uint8_t comp); |
| |
| /* Find which compression entity handles the specified nsapi */ |
| struct gprs_sndcp_comp *gprs_sndcp_comp_by_nsapi(const struct llist_head |
| *comp_entities, uint8_t nsapi); |
| |
| /* Find a comp_index for a given pcomp/dcomp value */ |
| uint8_t gprs_sndcp_comp_get_idx(const struct gprs_sndcp_comp *comp_entity, |
| uint8_t comp); |
| |
| /* Find a pcomp/dcomp value for a given comp_index */ |
| uint8_t gprs_sndcp_comp_get_comp(const struct gprs_sndcp_comp *comp_entity, |
| uint8_t comp_index); |