1
2
3 __version__ = '$Revision: 4791 $'.split()[1]
4 __date__ = '$Date: 2007-01-18 $'.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 fieldList = [
49 'dac',
50 'fid',
51 'reserved',
52 'MessageID',
53 'BinaryData',
54 ]
55
56 -def encode(params, validate=False):
57 '''Create a sls_header binary message payload to pack into an AIS Msg sls_header.
58
59 Fields in params:
60 - dac(uint): Designated Area Code 366 for US
61 - fid(uint): Functional Id (field automatically set to "1")
62 - reserved(uint): say what? (field automatically set to "0")
63 - MessageID(uint): Binary message indentifier
64 - BinaryData(binary): FIX: make this consume the rest!
65 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing
66 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented.
67 @rtype: BitVector
68 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8
69 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits.
70 '''
71
72 bvList = []
73 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['dac']),10))
74 bvList.append(binary.setBitVectorSize(BitVector(intVal=1),6))
75 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2))
76 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['MessageID']),6))
77 bvList.append(params['BinaryData'])
78
79 return binary.joinBV(bvList)
80
81 -def decode(bv, validate=False):
82 '''Unpack a sls_header message
83
84 Fields in params:
85 - dac(uint): Designated Area Code 366 for US
86 - fid(uint): Functional Id (field automatically set to "1")
87 - reserved(uint): say what? (field automatically set to "0")
88 - MessageID(uint): Binary message indentifier
89 - BinaryData(binary): FIX: make this consume the rest!
90 @type bv: BitVector
91 @param bv: Bits defining a message
92 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented.
93 @rtype: dict
94 @return: params
95 '''
96
97
98
99
100 r = {}
101 r['dac']=int(bv[0:10])
102 r['fid']=1
103 r['reserved']=0
104 r['MessageID']=int(bv[18:24])
105 r['BinaryData']=bv[24:]
106 return r
107
110
112 return 1
113
115 return 0
116
118 return int(bv[18:24])
119
122
123
125 out.write("<h3>sls_header<h3>\n")
126 out.write("<table border=\"1\">\n")
127 out.write("<tr bgcolor=\"orange\">\n")
128 out.write("<th align=\"left\">Field Name</th>\n")
129 out.write("<th align=\"left\">Type</th>\n")
130 out.write("<th align=\"left\">Value</th>\n")
131 out.write("<th align=\"left\">Value in Lookup Table</th>\n")
132 out.write("<th align=\"left\">Units</th>\n")
133 out.write("\n")
134 out.write("<tr>\n")
135 out.write("<td>dac</td>\n")
136 out.write("<td>uint</td>\n")
137 if 'dac' in params:
138 out.write(" <td>"+str(params['dac'])+"</td>\n")
139 out.write(" <td>"+str(params['dac'])+"</td>\n")
140 out.write("</tr>\n")
141 out.write("\n")
142 out.write("<tr>\n")
143 out.write("<td>fid</td>\n")
144 out.write("<td>uint</td>\n")
145 if 'fid' in params:
146 out.write(" <td>"+str(params['fid'])+"</td>\n")
147 out.write(" <td>"+str(params['fid'])+"</td>\n")
148 out.write("</tr>\n")
149 out.write("\n")
150 out.write("<tr>\n")
151 out.write("<td>reserved</td>\n")
152 out.write("<td>uint</td>\n")
153 if 'reserved' in params:
154 out.write(" <td>"+str(params['reserved'])+"</td>\n")
155 out.write(" <td>"+str(params['reserved'])+"</td>\n")
156 out.write("</tr>\n")
157 out.write("\n")
158 out.write("<tr>\n")
159 out.write("<td>MessageID</td>\n")
160 out.write("<td>uint</td>\n")
161 if 'MessageID' in params:
162 out.write(" <td>"+str(params['MessageID'])+"</td>\n")
163 out.write(" <td>"+str(params['MessageID'])+"</td>\n")
164 out.write("</tr>\n")
165 out.write("\n")
166 out.write("<tr>\n")
167 out.write("<td>BinaryData</td>\n")
168 out.write("<td>binary</td>\n")
169 if 'BinaryData' in params:
170 out.write(" <td>"+str(params['BinaryData'])+"</td>\n")
171 out.write(" <td>"+str(params['BinaryData'])+"</td>\n")
172 out.write("</tr>\n")
173 out.write("</table>\n")
174
175 -def printFields(params, out=sys.stdout, format='std', fieldList=None):
176 '''Print a BinaryData message to stdout.
177
178 Fields in params:
179 - dac(uint): Designated Area Code 366 for US
180 - fid(uint): Functional Id (field automatically set to "1")
181 - reserved(uint): say what? (field automatically set to "0")
182 - MessageID(uint): Binary message indentifier
183 - BinaryData(binary): FIX: make this consume the rest!
184 @param params: Dictionary of field names/values.
185 @param out: File like object to write to
186 @rtype: stdout
187 @return: text to out
188 '''
189
190 if 'std'==format:
191 out.write("BinaryData:\n")
192 if 'dac' in params: out.write(" dac: "+str(params['dac'])+"\n")
193 if 'fid' in params: out.write(" fid: "+str(params['fid'])+"\n")
194 if 'reserved' in params: out.write(" reserved: "+str(params['reserved'])+"\n")
195 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n")
196 if 'BinaryData' in params: out.write(" BinaryData: "+str(params['BinaryData'])+"\n")
197 elif 'csv'==format:
198 if None == options.fieldList:
199 options.fieldList = fieldList
200 needComma = False;
201 for field in fieldList:
202 if needComma: out.write(',')
203 needComma = True
204 if field in params:
205 out.write(str(params[field]))
206
207 out.write("\n")
208 elif 'html'==format:
209 printHtml(params,out)
210 else:
211 print "ERROR: unknown format:",format
212 assert False
213
214 return
215
216
217
218
219
220
221 import unittest
223 '''Return a params file base on the testvalue tags.
224 @rtype: dict
225 @return: params based on testvalue tags
226 '''
227 params = {}
228 params['dac'] = 366
229 params['fid'] = 1
230 params['reserved'] = 0
231 params['MessageID'] = 3
232 params['BinaryData'] = BitVector(bitstring='0')
233
234 return params
235
237 '''Use testvalue tag text from each type to build test case the sls_header message'''
239
240 params = testParams()
241 bits = encode(params)
242 r = decode(bits)
243
244
245 self.failUnlessEqual(r['dac'],params['dac'])
246 self.failUnlessEqual(r['fid'],params['fid'])
247 self.failUnlessEqual(r['reserved'],params['reserved'])
248 self.failUnlessEqual(r['MessageID'],params['MessageID'])
249 self.failUnlessEqual(r['BinaryData'],params['BinaryData'])
250
252 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true',
253 help='decode a "sls_header" AIS message')
254 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true',
255 help='encode a "sls_header" AIS message')
256 parser.add_option('--dac-field', dest='dacField',metavar='uint',type='int'
257 ,help='Field parameter value [default: %default]')
258 parser.add_option('--MessageID-field', dest='MessageIDField',metavar='uint',type='int'
259 ,help='Field parameter value [default: %default]')
260 parser.add_option('--BinaryData-field', dest='BinaryDataField',metavar='binary',type='string'
261 ,help='Field parameter value [default: %default]')
262
263
264 if __name__=='__main__':
265
266 from optparse import OptionParser
267 parser = OptionParser(usage="%prog [options]",
268 version="%prog "+__version__)
269
270 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true',
271 help='run the documentation tests')
272 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true',
273 help='run the unit tests')
274 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true',
275 help='Make the test output verbose')
276
277
278
279 typeChoices = ('binary','nmeapayload','nmea')
280 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType'
281 ,default='nmeapayload'
282 ,help='What kind of string to expect ('+', '.join(typeChoices)+') [default: %default]')
283
284
285 outputChoices = ('std','html','csv' )
286 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType'
287 ,default='std'
288 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]')
289
290 parser.add_option('-o','--output',dest='outputFileName',default=None,
291 help='Name of the python file to write [default: stdout]')
292
293 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append',
294 choices=fieldList,
295 help='Which fields to include in the output. Currently only for csv output [default: all]')
296
297 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true',
298 help='Print the field name for csv')
299
300 addMsgOptions(parser)
301
302 (options,args) = parser.parse_args()
303 success=True
304
305 if options.doctest:
306 import os; print os.path.basename(sys.argv[0]), 'doctests ...',
307 sys.argv= [sys.argv[0]]
308 if options.verbose: sys.argv.append('-v')
309 import doctest
310 numfail,numtests=doctest.testmod()
311 if numfail==0: print 'ok'
312 else:
313 print 'FAILED'
314 success=False
315
316 if not success: sys.exit('Something Failed')
317 del success
318
319 if options.unittest:
320 sys.argv = [sys.argv[0]]
321 if options.verbose: sys.argv.append('-v')
322 unittest.main()
323
324 outfile = sys.stdout
325 if None!=options.outputFileName:
326 outfile = file(options.outputFileName,'w')
327
328
329 if options.doEncode:
330
331 if None==options.dacField: parser.error("missing value for dacField")
332 if None==options.MessageIDField: parser.error("missing value for MessageIDField")
333 if None==options.BinaryDataField: parser.error("missing value for BinaryDataField")
334 msgDict={
335 'dac': options.dacField,
336 'fid': '1',
337 'reserved': '0',
338 'MessageID': options.MessageIDField,
339 'BinaryData': options.BinaryDataField,
340 }
341
342 bits = encode(msgDict)
343 if 'binary'==options.ioType: print str(bits)
344 elif 'nmeapayload'==options.ioType:
345
346 print "bitLen",len(bits)
347 bitLen=len(bits)
348 if bitLen%6!=0:
349 bits = bits + BitVector(size=(6 - (bitLen%6)))
350 print "result:",binary.bitvectoais6(bits)[0]
351
352
353
354 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability")
355 else: sys.exit('ERROR: unknown ioType. Help!')
356
357 if options.printCsvfieldList:
358
359 if None == options.fieldList: options.fieldList = fieldList
360 import StringIO
361 buf = StringIO.StringIO()
362 for field in options.fieldList:
363 buf.write(field+',')
364 result = buf.getvalue()
365 if result[-1] == ',': print result[:-1]
366 else: print result
367
368 if options.doDecode:
369 for msg in args:
370 bv = None
371 if 'binary' == options.ioType: bv = BitVector(bitstring=msg)
372 elif 'nmeapayload'== options.ioType: bv = binary.ais6tobitvec(msg)
373 elif 'nmea' == options.ioType: bv = binary.ais6tobitvec(msg.split(',')[5])
374 else: sys.exit('ERROR: unknown ioType. Help!')
375
376 printFields(decode(bv),out=outfile,format=options.outputType,fieldList=options.fieldList)
377