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-rw-r--r--lib/libdvben50221/en50221_app_ai.c191
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diff --git a/lib/libdvben50221/en50221_app_ai.c b/lib/libdvben50221/en50221_app_ai.c
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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 "en50221_app_ai.h"
+#include "en50221_app_tags.h"
+#include "asn_1.h"
+
+struct en50221_app_ai {
+ struct en50221_app_send_functions *funcs;
+
+ en50221_app_ai_callback callback;
+ void *callback_arg;
+
+ pthread_mutex_t lock;
+};
+
+static int en50221_app_ai_parse_app_info(struct en50221_app_ai *ai,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint8_t * data,
+ uint32_t data_length);
+
+
+struct en50221_app_ai *en50221_app_ai_create(struct en50221_app_send_functions *funcs)
+{
+ struct en50221_app_ai *ai = NULL;
+
+ // create structure and set it up
+ ai = malloc(sizeof(struct en50221_app_ai));
+ if (ai == NULL) {
+ return NULL;
+ }
+ ai->funcs = funcs;
+ ai->callback = NULL;
+
+ pthread_mutex_init(&ai->lock, NULL);
+
+ // done
+ return ai;
+}
+
+void en50221_app_ai_destroy(struct en50221_app_ai *ai)
+{
+ pthread_mutex_destroy(&ai->lock);
+ free(ai);
+}
+
+void en50221_app_ai_register_callback(struct en50221_app_ai *ai,
+ en50221_app_ai_callback callback,
+ void *arg)
+{
+ pthread_mutex_lock(&ai->lock);
+ ai->callback = callback;
+ ai->callback_arg = arg;
+ pthread_mutex_unlock(&ai->lock);
+}
+
+int en50221_app_ai_enquiry(struct en50221_app_ai *ai,
+ uint16_t session_number)
+{
+ uint8_t data[4];
+
+ data[0] = (TAG_APP_INFO_ENQUIRY >> 16) & 0xFF;
+ data[1] = (TAG_APP_INFO_ENQUIRY >> 8) & 0xFF;
+ data[2] = TAG_APP_INFO_ENQUIRY & 0xFF;
+ data[3] = 0;
+
+ return ai->funcs->send_data(ai->funcs->arg, session_number, data, 4);
+}
+
+int en50221_app_ai_entermenu(struct en50221_app_ai *ai,
+ uint16_t session_number)
+{
+ uint8_t data[4];
+
+ data[0] = (TAG_ENTER_MENU >> 16) & 0xFF;
+ data[1] = (TAG_ENTER_MENU >> 8) & 0xFF;
+ data[2] = TAG_ENTER_MENU & 0xFF;
+ data[3] = 0;
+
+ return ai->funcs->send_data(ai->funcs->arg, session_number, data, 4);
+}
+
+int en50221_app_ai_message(struct en50221_app_ai *ai,
+ 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];
+
+ switch (tag) {
+ case TAG_APP_INFO:
+ return en50221_app_ai_parse_app_info(ai, 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_ai_parse_app_info(struct en50221_app_ai *ai,
+ uint8_t slot_id,
+ uint16_t session_number,
+ uint8_t * data,
+ uint32_t data_length)
+{
+ // parse the length field
+ int length_field_len;
+ uint16_t asn_data_length;
+ if ((length_field_len = asn_1_decode(&asn_data_length, data, data_length)) < 0) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received data with invalid length from module on slot %02x\n",
+ slot_id);
+ return -1;
+ }
+ // check it
+ if (asn_data_length < 6) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ if (asn_data_length > (data_length - length_field_len)) {
+ print(LOG_LEVEL, ERROR, 1, "Received short data\n");
+ return -1;
+ }
+ uint8_t *app_info = data + length_field_len;
+
+ // parse the fields
+ uint8_t application_type = app_info[0];
+ uint16_t application_manufacturer = (app_info[1] << 8) | app_info[2];
+ uint16_t manufacturer_code = (app_info[3] << 8) | app_info[4];
+ uint8_t menu_string_length = app_info[5];
+ uint8_t *menu_string = app_info + 6;
+
+ // check the menu_string_length
+ if (menu_string_length > (asn_data_length - 6)) {
+ print(LOG_LEVEL, ERROR, 1,
+ "Received bad menu string length - adjusting\n");
+ menu_string_length = asn_data_length - 6;
+ }
+ // tell the app
+ pthread_mutex_lock(&ai->lock);
+ en50221_app_ai_callback cb = ai->callback;
+ void *cb_arg = ai->callback_arg;
+ pthread_mutex_unlock(&ai->lock);
+ if (cb) {
+ return cb(cb_arg, slot_id, session_number,
+ application_type, application_manufacturer,
+ manufacturer_code, menu_string_length,
+ menu_string);
+ }
+ return 0;
+}