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/* en50221 encoder An implementation for libdvb an implementation for the en50221 transport layer Copyright (C) 2004, 2005 Manu Abraham <abraham.manu@gmail.com> Copyright (C) 2005 Julian Scheel (julian at jusst dot de) Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net) This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <string.h> #include <libdvbmisc/dvbmisc.h> #include <pthread.h> #include <libucsi/endianops.h> #include "en50221_app_rm.h" #include "en50221_app_tags.h" #include "asn_1.h" struct en50221_app_rm { struct en50221_app_send_functions *funcs; en50221_app_rm_enq_callback enqcallback; void *enqcallback_arg; en50221_app_rm_reply_callback replycallback; void *replycallback_arg; en50221_app_rm_changed_callback changedcallback; void *changedcallback_arg; pthread_mutex_t lock; }; static int en50221_app_rm_parse_profile_enq(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length); static int en50221_app_rm_parse_profile_reply(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length); static int en50221_app_rm_parse_profile_change(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length); struct en50221_app_rm *en50221_app_rm_create(struct en50221_app_send_functions *funcs) { struct en50221_app_rm *rm = NULL; // create structure and set it up rm = malloc(sizeof(struct en50221_app_rm)); if (rm == NULL) { return NULL; } rm->funcs = funcs; rm->enqcallback = NULL; rm->replycallback = NULL; rm->changedcallback = NULL; pthread_mutex_init(&rm->lock, NULL); // done return rm; } void en50221_app_rm_destroy(struct en50221_app_rm *rm) { pthread_mutex_destroy(&rm->lock); free(rm); } void en50221_app_rm_register_enq_callback(struct en50221_app_rm *rm, en50221_app_rm_enq_callback callback, void *arg) { pthread_mutex_lock(&rm->lock); rm->enqcallback = callback; rm->enqcallback_arg = arg; pthread_mutex_unlock(&rm->lock); } void en50221_app_rm_register_reply_callback(struct en50221_app_rm *rm, en50221_app_rm_reply_callback callback, void *arg) { pthread_mutex_lock(&rm->lock); rm->replycallback = callback; rm->replycallback_arg = arg; pthread_mutex_unlock(&rm->lock); } void en50221_app_rm_register_changed_callback(struct en50221_app_rm *rm, en50221_app_rm_changed_callback callback, void *arg) { pthread_mutex_lock(&rm->lock); rm->changedcallback = callback; rm->changedcallback_arg = arg; pthread_mutex_unlock(&rm->lock); } int en50221_app_rm_enq(struct en50221_app_rm *rm, uint16_t session_number) { uint8_t buf[4]; // set up the tag buf[0] = (TAG_PROFILE_ENQUIRY >> 16) & 0xFF; buf[1] = (TAG_PROFILE_ENQUIRY >> 8) & 0xFF; buf[2] = TAG_PROFILE_ENQUIRY & 0xFF; buf[3] = 0; // create the data and send it return rm->funcs->send_data(rm->funcs->arg, session_number, buf, 4); } int en50221_app_rm_reply(struct en50221_app_rm *rm, uint16_t session_number, uint32_t resource_id_count, uint32_t * resource_ids) { uint8_t buf[10]; // set up the tag buf[0] = (TAG_PROFILE >> 16) & 0xFF; buf[1] = (TAG_PROFILE >> 8) & 0xFF; buf[2] = TAG_PROFILE & 0xFF; // encode the length field int length_field_len; if ((length_field_len = asn_1_encode(resource_id_count * 4, buf + 3, 3)) < 0) { return -1; } // copy the data and byteswap it uint32_t *copy_resource_ids = alloca(4 * resource_id_count); if (copy_resource_ids == NULL) { return -1; } uint8_t *data = (uint8_t *) copy_resource_ids; memcpy(data, resource_ids, resource_id_count * 4); uint32_t i; for (i = 0; i < resource_id_count; i++) { bswap32(data); data += 4; } // build the iovecs struct iovec iov[2]; iov[0].iov_base = buf; iov[0].iov_len = 3 + length_field_len; iov[1].iov_base = (uint8_t *) copy_resource_ids; iov[1].iov_len = resource_id_count * 4; // create the data and send it return rm->funcs->send_datav(rm->funcs->arg, session_number, iov, 2); } int en50221_app_rm_changed(struct en50221_app_rm *rm, uint16_t session_number) { uint8_t buf[4]; // set up the tag buf[0] = (TAG_PROFILE_CHANGE >> 16) & 0xFF; buf[1] = (TAG_PROFILE_CHANGE >> 8) & 0xFF; buf[2] = TAG_PROFILE_CHANGE & 0xFF; buf[3] = 0; // create the data and send it return rm->funcs->send_data(rm->funcs->arg, session_number, buf, 4); } int en50221_app_rm_message(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint32_t resource_id, uint8_t * data, uint32_t data_length) { (void) resource_id; // get the tag if (data_length < 3) { print(LOG_LEVEL, ERROR, 1, "Received short data\n"); return -1; } uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2]; // dispatch it switch (tag) { case TAG_PROFILE_ENQUIRY: return en50221_app_rm_parse_profile_enq(rm, slot_id, session_number, data + 3, data_length - 3); case TAG_PROFILE: return en50221_app_rm_parse_profile_reply(rm, slot_id, session_number, data + 3, data_length - 3); case TAG_PROFILE_CHANGE: return en50221_app_rm_parse_profile_change(rm, slot_id, session_number, data + 3, data_length - 3); } print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag); return -1; } static int en50221_app_rm_parse_profile_enq(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length) { (void) data; (void) data_length; pthread_mutex_lock(&rm->lock); en50221_app_rm_enq_callback cb = rm->enqcallback; void *cb_arg = rm->enqcallback_arg; pthread_mutex_unlock(&rm->lock); if (cb) { return cb(cb_arg, slot_id, session_number); } return 0; } static int en50221_app_rm_parse_profile_reply(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length) { // first of all, decode the length field uint16_t asn_data_length; int length_field_len; if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) { print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n"); return -1; } // check it if (asn_data_length > (data_length - length_field_len)) { print(LOG_LEVEL, ERROR, 1, "Received short data\n"); return -1; } uint32_t resources_count = asn_data_length / 4; uint32_t *resource_ids = (uint32_t *) (data + length_field_len); data += length_field_len; // byteswap it uint32_t i; for (i = 0; i < resources_count; i++) { bswap32(data); data += 4; } // inform observer pthread_mutex_lock(&rm->lock); en50221_app_rm_reply_callback cb = rm->replycallback; void *cb_arg = rm->replycallback_arg; pthread_mutex_unlock(&rm->lock); if (cb) { return cb(cb_arg, slot_id, session_number, resources_count, resource_ids); } return 0; } static int en50221_app_rm_parse_profile_change(struct en50221_app_rm *rm, uint8_t slot_id, uint16_t session_number, uint8_t * data, uint32_t data_length) { (void) data; (void) data_length; pthread_mutex_lock(&rm->lock); en50221_app_rm_changed_callback cb = rm->changedcallback; void *cb_arg = rm->changedcallback_arg; pthread_mutex_unlock(&rm->lock); if (cb) { return cb(cb_arg, slot_id, session_number); } return 0; }


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