|
1
|
|
|
#!/usr/bin/env python |
|
2
|
|
|
# -*- coding: utf-8 -*- |
|
3
|
|
|
|
|
4
|
|
|
"""Utilities for the APRS Python Module.""" |
|
5
|
|
|
|
|
6
|
|
|
# These imports are for python3 compatability inside python2 |
|
7
|
|
|
from __future__ import absolute_import |
|
8
|
|
|
from __future__ import division |
|
9
|
|
|
from __future__ import print_function |
|
10
|
|
|
|
|
11
|
|
|
import logging |
|
12
|
|
|
|
|
13
|
|
|
import apex.aprs.constants |
|
14
|
|
|
import apex.aprs.decimaldegrees |
|
15
|
|
|
import apex.kiss.constants |
|
16
|
|
|
|
|
17
|
|
|
__author__ = 'Jeffrey Phillips Freeman (WI2ARD)' |
|
18
|
|
|
__maintainer__ = "Jeffrey Phillips Freeman (WI2ARD)" |
|
19
|
|
|
__email__ = "[email protected]" |
|
20
|
|
|
__license__ = 'Apache License, Version 2.0' |
|
21
|
|
|
__copyright__ = 'Copyright 2016, Syncleus, Inc. and contributors' |
|
22
|
|
|
__credits__ = [] |
|
23
|
|
|
|
|
24
|
|
|
|
|
25
|
|
|
def dec2dm_lat(dec): |
|
26
|
|
|
"""Converts DecDeg to APRS Coord format. |
|
27
|
|
|
See: http://ember2ash.com/lat.htm |
|
28
|
|
|
|
|
29
|
|
|
Source: http://stackoverflow.com/questions/2056750 |
|
30
|
|
|
|
|
31
|
|
|
Example: |
|
32
|
|
|
>>> test_lat = 37.7418096 |
|
33
|
|
|
>>> aprs_lat = dec2dm_lat(test_lat) |
|
34
|
|
|
>>> aprs_lat |
|
35
|
|
|
'3744.51N' |
|
36
|
|
|
""" |
|
37
|
|
|
dec_min = apex.aprs.decimaldegrees.decimal2dm(dec) |
|
38
|
|
|
|
|
39
|
|
|
deg = dec_min[0] |
|
40
|
|
|
abs_deg = abs(deg) |
|
41
|
|
|
|
|
42
|
|
|
if not deg == abs_deg: |
|
43
|
|
|
suffix = 'S' |
|
44
|
|
|
else: |
|
45
|
|
|
suffix = 'N' |
|
46
|
|
|
|
|
47
|
|
|
retval = ''.join([str(abs_deg), "%.2f" % dec_min[1], suffix]) |
|
48
|
|
|
|
|
49
|
|
|
return retval |
|
50
|
|
|
|
|
51
|
|
|
|
|
52
|
|
|
def dec2dm_lng(dec): |
|
53
|
|
|
"""Converts DecDeg to APRS Coord format. |
|
54
|
|
|
See: http://ember2ash.com/lat.htm |
|
55
|
|
|
|
|
56
|
|
|
Example: |
|
57
|
|
|
>>> test_lng = -122.38833 |
|
58
|
|
|
>>> aprs_lng = dec2dm_lng(test_lng) |
|
59
|
|
|
>>> aprs_lng |
|
60
|
|
|
'12223.30W' |
|
61
|
|
|
""" |
|
62
|
|
|
dec_min = apex.aprs.decimaldegrees.decimal2dm(dec) |
|
63
|
|
|
|
|
64
|
|
|
deg = dec_min[0] |
|
65
|
|
|
abs_deg = abs(deg) |
|
66
|
|
|
|
|
67
|
|
|
if not deg == abs_deg: |
|
68
|
|
|
suffix = 'W' |
|
69
|
|
|
else: |
|
70
|
|
|
suffix = 'E' |
|
71
|
|
|
|
|
72
|
|
|
retval = ''.join([str(abs_deg), "%.2f" % dec_min[1], suffix]) |
|
73
|
|
|
|
|
74
|
|
|
return retval |
|
75
|
|
|
|
|
76
|
|
|
|
|
77
|
|
|
def decode_aprs_ascii_frame(ascii_frame): |
|
78
|
|
|
""" |
|
79
|
|
|
Breaks an ASCII APRS Frame down to it's constituent parts. |
|
80
|
|
|
|
|
81
|
|
|
:param frame: ASCII APRS Frame. |
|
82
|
|
|
:type frame: str |
|
83
|
|
|
|
|
84
|
|
|
:returns: Dictionary of APRS Frame parts: source, destination, path, text. |
|
85
|
|
|
:rtype: dict |
|
86
|
|
|
""" |
|
87
|
|
|
logging.debug('frame=%s', ascii_frame) |
|
88
|
|
|
decoded_frame = {} |
|
89
|
|
|
frame_so_far = '' |
|
90
|
|
|
|
|
91
|
|
|
for char in ascii_frame: |
|
92
|
|
|
if '>' in char and 'source' not in decoded_frame: |
|
93
|
|
|
decoded_frame['source'] = frame_so_far |
|
94
|
|
|
frame_so_far = '' |
|
95
|
|
|
elif ':' in char and 'path' not in decoded_frame: |
|
96
|
|
|
decoded_frame['path'] = frame_so_far |
|
97
|
|
|
frame_so_far = '' |
|
98
|
|
|
else: |
|
99
|
|
|
frame_so_far = ''.join([frame_so_far, char]) |
|
100
|
|
|
|
|
101
|
|
|
decoded_frame['text'] = frame_so_far |
|
102
|
|
|
decoded_frame['destination'] = decoded_frame['path'].split(',')[0] |
|
103
|
|
|
|
|
104
|
|
|
return decoded_frame |
|
105
|
|
|
|
|
106
|
|
|
|
|
107
|
|
|
def format_path(path_list): |
|
108
|
|
|
""" |
|
109
|
|
|
Formats path from raw APRS KISS frame. |
|
110
|
|
|
|
|
111
|
|
|
:param path_list: List of path elements. |
|
112
|
|
|
:type path_list: list |
|
113
|
|
|
|
|
114
|
|
|
:return: Formatted APRS path. |
|
115
|
|
|
:rtype: str |
|
116
|
|
|
""" |
|
117
|
|
|
return ','.join(path_list) |
|
118
|
|
|
|
|
119
|
|
|
|
|
120
|
|
|
def format_aprs_frame(frame): |
|
121
|
|
|
""" |
|
122
|
|
|
Formats APRS frame-as-dict into APRS frame-as-string. |
|
123
|
|
|
|
|
124
|
|
|
:param frame: APRS frame-as-dict |
|
125
|
|
|
:type frame: dict |
|
126
|
|
|
|
|
127
|
|
|
:return: APRS frame-as-string. |
|
128
|
|
|
:rtype: str |
|
129
|
|
|
""" |
|
130
|
|
|
formatted_frame = '>'.join([frame['source'], frame['destination']]) |
|
131
|
|
|
if frame['path']: |
|
132
|
|
|
formatted_frame = ','.join([formatted_frame, format_path(frame['path'])]) |
|
133
|
|
|
formatted_frame += ':' |
|
134
|
|
|
formatted_frame += frame['text'] |
|
135
|
|
|
return formatted_frame |
|
136
|
|
|
|
|
137
|
|
|
|
|
138
|
|
|
def valid_callsign(callsign): |
|
139
|
|
|
""" |
|
140
|
|
|
Validates callsign. |
|
141
|
|
|
|
|
142
|
|
|
:param callsign: Callsign to validate. |
|
143
|
|
|
:type callsign: str |
|
144
|
|
|
|
|
145
|
|
|
:returns: True if valid, False otherwise. |
|
146
|
|
|
:rtype: bool |
|
147
|
|
|
""" |
|
148
|
|
|
logging.debug('callsign=%s', callsign) |
|
149
|
|
|
|
|
150
|
|
|
if '-' in callsign: |
|
151
|
|
|
if not callsign.count('-') == 1: |
|
152
|
|
|
return False |
|
153
|
|
|
else: |
|
154
|
|
|
callsign, ssid = callsign.split('-') |
|
155
|
|
|
else: |
|
156
|
|
|
ssid = 0 |
|
157
|
|
|
|
|
158
|
|
|
logging.debug('callsign=%s ssid=%s', callsign, ssid) |
|
159
|
|
|
|
|
160
|
|
|
if (len(callsign) < 2 or len(callsign) > 6 or len(str(ssid)) < 1 or |
|
161
|
|
|
len(str(ssid)) > 2): |
|
162
|
|
|
return False |
|
163
|
|
|
|
|
164
|
|
|
for char in callsign: |
|
165
|
|
|
if not (char.isalpha() or char.isdigit()): |
|
166
|
|
|
return False |
|
167
|
|
|
|
|
168
|
|
|
if not str(ssid).isdigit(): |
|
169
|
|
|
return False |
|
170
|
|
|
|
|
171
|
|
|
if int(ssid) < 0 or int(ssid) > 15: |
|
172
|
|
|
return False |
|
173
|
|
|
|
|
174
|
|
|
return True |
|
175
|
|
|
|
|
176
|
|
|
|
|
177
|
|
|
def run_doctest(): # pragma: no cover |
|
178
|
|
|
"""Runs doctests for this module.""" |
|
179
|
|
|
import doctest |
|
180
|
|
|
import apex.aprs.util # pylint: disable=W0406,W0621 |
|
181
|
|
|
return doctest.testmod(apex.aprs.util) |
|
182
|
|
|
|
|
183
|
|
|
|
|
184
|
|
|
def hash_frame(frame): |
|
185
|
|
|
""" |
|
186
|
|
|
Produces an integr value that acts as a hash for the frame |
|
187
|
|
|
:param frame: A frame packet |
|
188
|
|
|
:type frame: dict |
|
189
|
|
|
:return: an integer representing the hash |
|
190
|
|
|
""" |
|
191
|
|
|
hashing = 0 |
|
192
|
|
|
index = 0 |
|
193
|
|
|
frame_string_prefix = frame['source'] + ">" + frame['destination'] + ":" |
|
194
|
|
|
for frame_chr in frame_string_prefix: |
|
195
|
|
|
hashing = ord(frame_chr) << (8*(index % 4)) ^ hashing |
|
196
|
|
|
index += 1 |
|
197
|
|
|
for byte in frame['text']: |
|
198
|
|
|
hashing = byte << (8*(index % 4)) ^ hashing |
|
199
|
|
|
index += 1 |
|
200
|
|
|
return hashing |
|
201
|
|
|
|
|
202
|
|
|
|
|
203
|
|
|
if __name__ == '__main__': |
|
204
|
|
|
run_doctest() # pragma: no cover |
|
205
|
|
|
|
Syncleus /
apex
