RecordLoc.m @ 497

Revision 363, 4.3 kB (checked in by henri, 4 years ago)
Updated copyright dates

Line
1	//
2	// RecordLoc.m
3	// DotTel SDK
4	//
5	// Created by Henri Asseily on 9/13/08.
6	/*
7	Copyright (c) 2008-2009, Telnic Ltd. All rights reserved.
8
9	Redistribution and use in source and binary forms, with or without modification,
10	are permitted provided that the following conditions are met:
11
12	Redistributions of source code must retain the above copyright notice, this list of conditions
13	and the following disclaimer. Redistributions in binary form must reproduce the above copyright
14	notice, this list of conditions and the following disclaimer in the documentation and/or other
15	materials provided with the distribution.
16	Neither the name of the Telnic Ltd. nor the names of its contributors may be used to endorse or
17	promote products derived from this software without specific prior written permission.
18	THIS DOCUMENTATION IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
19	OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
20	AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
21	CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22	DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
24	IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25	OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26	*/
27	//
28
29	#import "RecordLoc.h"
30
31
32	@implementation RecordLoc
33
34	@synthesize isValid;
35	@synthesize expiryDate;
36
37	+ (id)recordWithRr:(ldns_rr *)rr {
38	NSDate *lookupDate = [[NSDate date] retain];
39	self = [RecordLoc recordWithRr:rr date:lookupDate];
40	[lookupDate release];
41	return self;
42	}
43
44	+ (id)recordWithRr:(ldns_rr )rr date:(NSDate )lookupDate {
45	self = [[[RecordLoc alloc] initWithRr:rr date:lookupDate] autorelease];
46	return self;
47	}
48
49	- (id)init {
50	// Never initialize it empty
51	self = [super init];
52	isValid = NO;
53	return self;
54	}
55
56	- (id)initWithRr:(ldns_rr )rr date:(NSDate )lookupDate {
57	self = [super init];
58	isValid = NO;
59
60	if (ldns_rr_get_type(rr) != LDNS_RR_TYPE_LOC)
61	return self;
62
63	NSTimeInterval ttl = (NSTimeInterval)ldns_rr_ttl(rr);
64	expiryDate = [lookupDate addTimeInterval:ttl];
65
66	// get the first RDF of the resource record, nothing else matters
67	ldns_rdf *rdf;
68	rdf = ldns_rr_rdf(rr, 0);
69
70	// Parse the LOC record and convert it into a CLLocation instance
71	// Sample parsing code at http://tools.ietf.org/html/rfc1876
72
73	uint8_t version = ldns_rdf_data(rdf)[0];
74
75	if (version != 0) {
76	//NSLog(@"LOC Record version is not 0. Can't understand it");
77	return self;
78	}
79
80	// uint8_t size;
81	uint32_t horizontal_precision;
82	uint32_t vertical_precision;
83	uint32_t longitude;
84	uint32_t latitude;
85	CLLocationDistance altitude;
86	CLLocationCoordinate2D coords2D;
87	CLLocationAccuracy h_accuracy;
88	CLLocationAccuracy v_accuracy;
89
90	uint32_t equator = (uint32_t) ldns_power(2, 31);
91
92	// size = ldns_rdf_data(rdf)[1]; // CLLocation doesn't use it
93	horizontal_precision = ldns_rdf_data(rdf)[2];
94	vertical_precision = ldns_rdf_data(rdf)[3];
95
96	latitude = ldns_read_uint32(&ldns_rdf_data(rdf)[4]);
97	longitude = ldns_read_uint32(&ldns_rdf_data(rdf)[8]);
98	altitude = ldns_read_uint32(&ldns_rdf_data(rdf)[12]);
99
100	if (latitude > equator) { // North (positive)
101	latitude = latitude - equator;
102	coords2D.latitude = 1.0 * (long)latitude / (long)(1000 * 60 * 60);
103	} else { // South (negative)
104	latitude = equator - latitude;
105	coords2D.latitude = -1.0 * (long)latitude / (long)(1000 * 60 * 60);
106	}
107
108	if (longitude > equator) { // East (positive)
109	longitude = longitude - equator;
110	coords2D.longitude = 1.0 * (long)longitude / (long)(1000 * 60 * 60);
111	} else { // West (negative)
112	longitude = equator - longitude;
113	coords2D.longitude = -1.0 * (long)longitude / (long)(1000 * 60 * 60);
114	}
115
116	// Fix the other numbers
117	altitude = altitude/100 - 100000;
118	h_accuracy = ((horizontal_precision & 0xf0) >> 4) * pow(10,(horizontal_precision & 0x0f)-2);
119	v_accuracy = ((vertical_precision & 0xf0) >> 4) * pow(10,(vertical_precision & 0x0f)-2);
120
121	[self initWithCoordinate:coords2D
122	altitude:altitude
123	horizontalAccuracy:h_accuracy
124	verticalAccuracy:v_accuracy
125	timestamp:[NSDate date]];
126
127	isValid = YES;
128	return self;
129	}
130
131	@end

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