1
2
3 __version__ = '$Revision: 4791 $'.split()[1]
4 __date__ = '$Date: 2007-01-05 $'.split()[1]
5 __author__ = 'xmlbinmsg'
6
7 __doc__='''
8
9 Autogenerated python functions to serialize/deserialize binary messages.
10
11 Generated by: ./aisxmlbinmsg2py.py
12
13 Need to then wrap these functions with the outer AIS packet and then
14 convert the whole binary blob to a NMEA string. Those functions are
15 not currently provided in this file.
16
17 serialize: python to ais binary
18 deserialize: ais binary to python
19
20 The generated code uses translators.py, binary.py, and aisstring.py
21 which should be packaged with the resulting files.
22
23
24 @requires: U{epydoc<http://epydoc.sourceforge.net/>} > 3.0alpha3
25 @requires: U{BitVector<http://cheeseshop.python.org/pypi/BitVector>}
26
27 @author: '''+__author__+'''
28 @version: ''' + __version__ +'''
29 @var __date__: Date of last svn commit
30 @undocumented: __version__ __author__ __doc__ parser
31 @status: under development
32 @license: Generated code has no license
33 '''
34
35 import sys
36 from decimal import Decimal
37 from BitVector import BitVector
38
39 import binary, aisstring
40
41
42 TrueBV = BitVector(bitstring="1")
43 "Why always rebuild the True bit? This should speed things up a bunch"
44 FalseBV = BitVector(bitstring="0")
45 "Why always rebuild the False bit? This should speed things up a bunch"
46
47
48 -def encode(params, validate=False):
49 '''Create a sls_header binary message payload to pack into an AIS Msg sls_header.
50
51 Fields in params:
52 - dac(uint): Designated Area Code 366 for US
53 - fid(uint): Functional Id (field automatically set to "1")
54 - reserved(uint): say what? (field automatically set to "0")
55 - MessageID(uint): Binary message indentifier
56 - BinaryData(binary): FIX: make this consume the rest!
57 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing
58 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented.
59 @rtype: BitVector
60 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8
61 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits.
62 '''
63
64 bvList = []
65 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['dac']),10))
66 bvList.append(binary.setBitVectorSize(BitVector(intVal=1),6))
67 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2))
68 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['MessageID']),6))
69 bvList.append(params['BinaryData'])
70
71 return binary.joinBV(bvList)
72
73 -def decode(bv, validate=False):
74 '''Unpack a sls_header message
75
76 Fields in params:
77 - dac(uint): Designated Area Code 366 for US
78 - fid(uint): Functional Id (field automatically set to "1")
79 - reserved(uint): say what? (field automatically set to "0")
80 - MessageID(uint): Binary message indentifier
81 - BinaryData(binary): FIX: make this consume the rest!
82 @type bv: BitVector
83 @param bv: Bits defining a message
84 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented.
85 @rtype: dict
86 @return: params
87 '''
88
89
90
91
92 r = {}
93 r['dac']=int(bv[0:10])
94 r['fid']=1
95 r['reserved']=0
96 r['MessageID']=int(bv[18:24])
97 r['BinaryData']=bv[24:]
98 return r
99
102
104 return 1
105
107 return 0
108
110 return int(bv[18:24])
111
114
115
117 out.write("<h3>sls_header<h3>\n")
118 out.write("<table border=\"1\">\n")
119 out.write("<tr bgcolor=\"orange\">\n")
120 out.write("<th align=\"left\">Field Name</th>\n")
121 out.write("<th align=\"left\">Type</th>\n")
122 out.write("<th align=\"left\">Value</th>\n")
123 out.write("<th align=\"left\">Value in Lookup Table</th>\n")
124 out.write("\n")
125 out.write("<tr>\n")
126 out.write("<td>dac</td>\n")
127 out.write("<td>uint</td>\n")
128 if 'dac' in params:
129 out.write(" <td>"+str(params['dac'])+"</td>\n")
130 out.write(" <td>"+str(params['dac'])+"</td>\n")
131 out.write("</tr>\n")
132 out.write("\n")
133 out.write("<tr>\n")
134 out.write("<td>fid</td>\n")
135 out.write("<td>uint</td>\n")
136 if 'fid' in params:
137 out.write(" <td>"+str(params['fid'])+"</td>\n")
138 out.write(" <td>"+str(params['fid'])+"</td>\n")
139 out.write("</tr>\n")
140 out.write("\n")
141 out.write("<tr>\n")
142 out.write("<td>reserved</td>\n")
143 out.write("<td>uint</td>\n")
144 if 'reserved' in params:
145 out.write(" <td>"+str(params['reserved'])+"</td>\n")
146 out.write(" <td>"+str(params['reserved'])+"</td>\n")
147 out.write("</tr>\n")
148 out.write("\n")
149 out.write("<tr>\n")
150 out.write("<td>MessageID</td>\n")
151 out.write("<td>uint</td>\n")
152 if 'MessageID' in params:
153 out.write(" <td>"+str(params['MessageID'])+"</td>\n")
154 out.write(" <td>"+str(params['MessageID'])+"</td>\n")
155 out.write("</tr>\n")
156 out.write("\n")
157 out.write("<tr>\n")
158 out.write("<td>BinaryData</td>\n")
159 out.write("<td>binary</td>\n")
160 if 'BinaryData' in params:
161 out.write(" <td>"+str(params['BinaryData'])+"</td>\n")
162 out.write(" <td>"+str(params['BinaryData'])+"</td>\n")
163 out.write("</tr>\n")
164 out.write("</table>\n")
166 '''Print a BinaryData message to stdout.
167
168 Fields in params:
169 - dac(uint): Designated Area Code 366 for US
170 - fid(uint): Functional Id (field automatically set to "1")
171 - reserved(uint): say what? (field automatically set to "0")
172 - MessageID(uint): Binary message indentifier
173 - BinaryData(binary): FIX: make this consume the rest!
174 @param params: Dictionary of field names/values.
175 @param out: File like object to write to
176 @rtype: stdout
177 @return: text to out
178 '''
179
180 if 'std'==format:
181 out.write("BinaryData:\n")
182 if 'dac' in params: out.write(" dac: "+str(params['dac'])+"\n")
183 if 'fid' in params: out.write(" fid: "+str(params['fid'])+"\n")
184 if 'reserved' in params: out.write(" reserved: "+str(params['reserved'])+"\n")
185 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n")
186 if 'BinaryData' in params: out.write(" BinaryData: "+str(params['BinaryData'])+"\n")
187 elif 'html'==format:
188 printHtml(params,out)
189 else:
190 print "ERROR: unknown format:",format
191 assert False
192
193 return
194
195
196
197
198
199
200 import unittest
202 '''Return a params file base on the testvalue tags.
203 @rtype: dict
204 @return: params based on testvalue tags
205 '''
206 params = {}
207 params['dac'] = 366
208 params['fid'] = 1
209 params['reserved'] = 0
210 params['MessageID'] = 3
211 params['BinaryData'] = BitVector(bitstring='0')
212
213 return params
214
216 '''Use testvalue tag text from each type to build test case the sls_header message'''
218
219 params = testParams()
220 bits = encode(params)
221 r = decode(bits)
222
223
224 self.failUnlessEqual(r['dac'],params['dac'])
225 self.failUnlessEqual(r['fid'],params['fid'])
226 self.failUnlessEqual(r['reserved'],params['reserved'])
227 self.failUnlessEqual(r['MessageID'],params['MessageID'])
228 self.failUnlessEqual(r['BinaryData'],params['BinaryData'])
229
231 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true',
232 help='decode a "sls_header" AIS message')
233 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true',
234 help='encode a "sls_header" AIS message')
235 parser.add_option('--dac-field', dest='dacField',metavar='uint',type='int'
236 ,help='Field parameter value [default: %default]')
237 parser.add_option('--MessageID-field', dest='MessageIDField',metavar='uint',type='int'
238 ,help='Field parameter value [default: %default]')
239 parser.add_option('--BinaryData-field', dest='BinaryDataField',metavar='binary',type='string'
240 ,help='Field parameter value [default: %default]')
241
242
243 if __name__=='__main__':
244
245 from optparse import OptionParser
246 parser = OptionParser(usage="%prog [options]",
247 version="%prog "+__version__)
248
249 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true',
250 help='run the documentation tests')
251 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true',
252 help='run the unit tests')
253 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true',
254 help='Make the test output verbose')
255
256
257
258 typeChoices = ('binary','nmeapayload','nmea')
259 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType'
260 ,default='nmeapayload'
261 ,help='What kind of string to expect ('+', '.join(typeChoices)+') [default: %default]')
262
263
264 outputChoices = ('std','html','xml' )
265 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType'
266 ,default='std'
267 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]')
268
269 parser.add_option('-o','--output',dest='outputFileName',default=None,
270 help='Name of the python file to write [default: stdout]')
271
272 addMsgOptions(parser)
273
274 (options,args) = parser.parse_args()
275 success=True
276
277 if options.doctest:
278 import os; print os.path.basename(sys.argv[0]), 'doctests ...',
279 sys.argv= [sys.argv[0]]
280 if options.verbose: sys.argv.append('-v')
281 import doctest
282 numfail,numtests=doctest.testmod()
283 if numfail==0: print 'ok'
284 else:
285 print 'FAILED'
286 success=False
287
288 if not success: sys.exit('Something Failed')
289 del success
290
291 if options.unittest:
292 sys.argv = [sys.argv[0]]
293 if options.verbose: sys.argv.append('-v')
294 unittest.main()
295
296 outfile = sys.stdout
297 if None!=options.outputFileName:
298 outfile = file(options.outputFileName,'w')
299
300
301 if options.doEncode:
302
303 if None==options.dacField: parser.error("missing value for dacField")
304 if None==options.MessageIDField: parser.error("missing value for MessageIDField")
305 if None==options.BinaryDataField: parser.error("missing value for BinaryDataField")
306 msgDict={
307 'dac': options.dacField,
308 'fid': '1',
309 'reserved': '0',
310 'MessageID': options.MessageIDField,
311 'BinaryData': options.BinaryDataField,
312 }
313
314 bits = encode(msgDict)
315 if 'binary'==options.ioType: print str(bits)
316 elif 'nmeapayload'==options.ioType:
317
318 print "bitLen",len(bits)
319 bitLen=len(bits)
320 if bitLen%6!=0:
321 bits = bits + BitVector(size=(6 - (bitLen%6)))
322 print "result:",binary.bitvectoais6(bits)[0]
323
324
325
326 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability")
327 else: sys.exit('ERROR: unknown ioType. Help!')
328
329 if options.doDecode:
330 for msg in args:
331 bv = None
332 if 'binary' == options.ioType: bv = BitVector(bitstring=msg)
333 elif 'nmeapayload'== options.ioType: bv = binary.ais6tobitvec(msg)
334 elif 'nmea' == options.ioType: bv = binary.ais6tobitvec(msg.split(',')[5])
335 else: sys.exit('ERROR: unknown ioType. Help!')
336
337 printFields(decode(bv),out=outfile,format=options.outputType)
338