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295 lines
9.9 KiB
295 lines
9.9 KiB
/*
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en50221 encoder An implementation for libdvb
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an implementation for the en50221 transport layer
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Copyright (C) 2004, 2005 Manu Abraham (manu@kromtek.com)
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Copyright (C) 2005 Julian Scheel (julian at jusst dot de)
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Copyright (C) 2006 Andrew de Quincey (adq_dvb@lidskialf.net)
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of
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the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include <libdvbmisc/dvbmisc.h>
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#include <pthread.h>
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#include <libucsi/endianops.h>
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#include "en50221_app_rm.h"
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#include "en50221_app_tags.h"
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#include "asn_1.h"
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struct en50221_app_rm_private {
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struct en50221_app_send_functions *funcs;
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en50221_app_rm_enq_callback enqcallback;
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void *enqcallback_arg;
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en50221_app_rm_reply_callback replycallback;
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void *replycallback_arg;
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en50221_app_rm_changed_callback changedcallback;
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void *changedcallback_arg;
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pthread_mutex_t lock;
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};
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static int en50221_app_rm_parse_profile_enq(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length);
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static int en50221_app_rm_parse_profile_reply(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length);
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static int en50221_app_rm_parse_profile_change(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length);
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en50221_app_rm en50221_app_rm_create(struct en50221_app_send_functions *funcs)
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{
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struct en50221_app_rm_private *private = NULL;
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// create structure and set it up
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private = malloc(sizeof(struct en50221_app_rm_private));
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if (private == NULL) {
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return NULL;
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}
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private->funcs = funcs;
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private->enqcallback = NULL;
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private->replycallback = NULL;
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private->changedcallback = NULL;
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pthread_mutex_init(&private->lock, NULL);
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// done
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return private;
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}
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void en50221_app_rm_destroy(en50221_app_rm rm)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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pthread_mutex_destroy(&private->lock);
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free(private);
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}
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void en50221_app_rm_register_enq_callback(en50221_app_rm rm,
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en50221_app_rm_enq_callback callback, void *arg)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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pthread_mutex_lock(&private->lock);
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private->enqcallback = callback;
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private->enqcallback_arg = arg;
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pthread_mutex_unlock(&private->lock);
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}
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void en50221_app_rm_register_reply_callback(en50221_app_rm rm,
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en50221_app_rm_reply_callback callback, void *arg)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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pthread_mutex_lock(&private->lock);
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private->replycallback = callback;
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private->replycallback_arg = arg;
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pthread_mutex_unlock(&private->lock);
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}
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void en50221_app_rm_register_changed_callback(en50221_app_rm rm,
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en50221_app_rm_changed_callback callback, void *arg)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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pthread_mutex_lock(&private->lock);
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private->changedcallback = callback;
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private->changedcallback_arg = arg;
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pthread_mutex_unlock(&private->lock);
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}
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int en50221_app_rm_enq(en50221_app_rm rm, uint16_t session_number)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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uint8_t buf[4];
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// set up the tag
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buf[0] = (TAG_PROFILE_ENQUIRY >> 16) & 0xFF;
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buf[1] = (TAG_PROFILE_ENQUIRY >> 8) & 0xFF;
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buf[2] = TAG_PROFILE_ENQUIRY & 0xFF;
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buf[3] = 0;
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// create the data and send it
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return private->funcs->send_data(private->funcs->arg, session_number, buf, 4);
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}
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int en50221_app_rm_reply(en50221_app_rm rm, uint16_t session_number,
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uint32_t resource_id_count,
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uint32_t *resource_ids)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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uint8_t buf[10];
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// set up the tag
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buf[0] = (TAG_PROFILE >> 16) & 0xFF;
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buf[1] = (TAG_PROFILE >> 8) & 0xFF;
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buf[2] = TAG_PROFILE & 0xFF;
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// encode the length field
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int length_field_len;
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if ((length_field_len = asn_1_encode(resource_id_count*4, buf+3, 3)) < 0) {
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return -1;
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}
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// copy the data and byteswap it
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uint32_t *copy_resource_ids = alloca(4*resource_id_count);
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if (copy_resource_ids == NULL) {
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return -1;
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}
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uint8_t *data = (uint8_t*) copy_resource_ids;
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memcpy(data, resource_ids, resource_id_count*4);
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uint32_t i;
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for(i=0; i<resource_id_count; i++) {
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bswap32(data);
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data+=4;
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}
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// build the iovecs
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struct iovec iov[2];
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iov[0].iov_base = buf;
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iov[0].iov_len = 3+length_field_len;
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iov[1].iov_base = (uint8_t*) copy_resource_ids;
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iov[1].iov_len = resource_id_count * 4;
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// create the data and send it
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return private->funcs->send_datav(private->funcs->arg, session_number, iov, 2);
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}
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int en50221_app_rm_changed(en50221_app_rm rm, uint16_t session_number)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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uint8_t buf[4];
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// set up the tag
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buf[0] = (TAG_PROFILE_CHANGE >> 16) & 0xFF;
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buf[1] = (TAG_PROFILE_CHANGE >> 8) & 0xFF;
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buf[2] = TAG_PROFILE_CHANGE & 0xFF;
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buf[3] = 0;
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// create the data and send it
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return private->funcs->send_data(private->funcs->arg, session_number, buf, 4);
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}
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int en50221_app_rm_message(en50221_app_rm rm,
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uint8_t slot_id,
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uint16_t session_number,
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uint32_t resource_id,
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uint8_t *data, uint32_t data_length)
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{
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struct en50221_app_rm_private *private = (struct en50221_app_rm_private *) rm;
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(void) resource_id;
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// get the tag
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if (data_length < 3) {
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print(LOG_LEVEL, ERROR, 1, "Received short data\n");
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return -1;
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}
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uint32_t tag = (data[0] << 16) | (data[1] << 8) | data[2];
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// dispatch it
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switch(tag)
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{
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case TAG_PROFILE_ENQUIRY:
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return en50221_app_rm_parse_profile_enq(private, slot_id, session_number, data+3, data_length-3);
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case TAG_PROFILE:
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return en50221_app_rm_parse_profile_reply(private, slot_id, session_number, data+3, data_length-3);
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case TAG_PROFILE_CHANGE:
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return en50221_app_rm_parse_profile_change(private, slot_id, session_number, data+3, data_length-3);
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}
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print(LOG_LEVEL, ERROR, 1, "Received unexpected tag %x\n", tag);
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return -1;
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}
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static int en50221_app_rm_parse_profile_enq(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length)
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{
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(void)data;
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(void)data_length;
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pthread_mutex_lock(&private->lock);
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en50221_app_rm_enq_callback cb = private->enqcallback;
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void *cb_arg = private->enqcallback_arg;
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pthread_mutex_unlock(&private->lock);
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if (cb) {
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return cb(cb_arg, slot_id, session_number);
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}
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return 0;
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}
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static int en50221_app_rm_parse_profile_reply(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length)
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{
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// first of all, decode the length field
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uint16_t asn_data_length;
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int length_field_len;
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if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
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print(LOG_LEVEL, ERROR, 1, "ASN.1 decode error\n");
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return -1;
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}
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// check it
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if (asn_data_length > (data_length-length_field_len)) {
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print(LOG_LEVEL, ERROR, 1, "Received short data\n");
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return -1;
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}
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uint32_t resources_count = asn_data_length / 4;
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uint32_t *resource_ids = (uint32_t*) (data+length_field_len);
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data += length_field_len;
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// byteswap it
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uint32_t i;
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for(i=0; i< resources_count; i++) {
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bswap32(data);
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data+=4;
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}
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// inform observer
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pthread_mutex_lock(&private->lock);
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en50221_app_rm_reply_callback cb = private->replycallback;
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void *cb_arg = private->replycallback_arg;
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pthread_mutex_unlock(&private->lock);
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if (cb) {
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return cb(cb_arg, slot_id, session_number, resources_count, resource_ids);
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}
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return 0;
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}
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static int en50221_app_rm_parse_profile_change(struct en50221_app_rm_private *private,
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uint8_t slot_id, uint16_t session_number,
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uint8_t *data, uint32_t data_length)
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{
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(void)data;
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(void)data_length;
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pthread_mutex_lock(&private->lock);
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en50221_app_rm_changed_callback cb = private->changedcallback;
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void *cb_arg = private->changedcallback_arg;
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pthread_mutex_unlock(&private->lock);
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if (cb) {
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return cb(cb_arg, slot_id, session_number);
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}
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return 0;
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}
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