/* GPRS SNDCP header compression entity management tools */ /* (C) 2016 by sysmocom s.f.m.c. GmbH * 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 . */ #pragma once #include #include #include /* 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);