aboutsummaryrefslogtreecommitdiffstats
path: root/lib/libdvben50221/en50221_app_ai.c
blob: b7ded66a12b562457f2f2a6a7a6cc27e4b278684 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/*
    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;
}