Package ais :: Module sls_lockschedule
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Source Code for Module ais.sls_lockschedule

  1  #!/usr/bin/env python 
  2   
  3  __version__ = '$Revision: 4791 $'.split()[1] 
  4  __date__ = '$Date: 2007-02-18 $'.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  @todo: FIX: put in a description of the message here with fields and types. 
 34  ''' 
 35   
 36  import sys 
 37  from decimal import Decimal 
 38  from BitVector import BitVector 
 39   
 40  import binary, aisstring 
 41   
 42  # FIX: check to see if these will be needed 
 43  TrueBV  = BitVector(bitstring="1") 
 44  "Why always rebuild the True bit?  This should speed things up a bunch" 
 45  FalseBV = BitVector(bitstring="0") 
 46  "Why always rebuild the False bit?  This should speed things up a bunch" 
 47   
 48   
 49  fieldList = ( 
 50          'vessel', 
 51          'direction', 
 52          'ETA_month', 
 53          'ETA_day', 
 54          'ETA_hour', 
 55          'ETA_min', 
 56          'reserved', 
 57  ) 
 58   
 59  fieldListPostgres = ( 
 60          'vessel', 
 61          'direction', 
 62          'ETA_month', 
 63          'ETA_day', 
 64          'ETA_hour', 
 65          'ETA_min', 
 66          'reserved', 
 67  ) 
 68   
 69  toPgFields = { 
 70  } 
 71  ''' 
 72  Go to the Postgis field names from the straight field name 
 73  ''' 
 74   
 75  fromPgFields = { 
 76  } 
 77  ''' 
 78  Go from the Postgis field names to the straight field name 
 79  ''' 
 80   
 81  pgTypes = { 
 82  } 
 83  ''' 
 84  Lookup table for each postgis field name to get its type. 
 85  ''' 
 86   
87 -def encode(params, validate=False):
88 '''Create a sls_lockorder binary message payload to pack into an AIS Msg sls_lockorder. 89 90 Fields in params: 91 - vessel(aisstr6): Vessel Name 92 - direction(bool): Up bound/Down bound 93 - ETA_month(uint): Estimated time of arrival month 1..12 94 - ETA_day(uint): Estimated time of arrival day of the month 1..31 95 - ETA_hour(uint): Estimated time of arrival UTC hours 0..23 96 - ETA_min(uint): Estimated time of arrival minutes 97 - reserved(uint): Reserved bits for future use (field automatically set to "0") 98 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing 99 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 100 @rtype: BitVector 101 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8 102 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits. 103 ''' 104 105 bvList = [] 106 if 'vessel' in params: 107 bvList.append(aisstring.encode(params['vessel'],90)) 108 else: 109 bvList.append(aisstring.encode('@@@@@@@@@@@@@@@',90)) 110 if params["direction"]: bvList.append(TrueBV) 111 else: bvList.append(FalseBV) 112 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['ETA_month']),4)) 113 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['ETA_day']),5)) 114 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['ETA_hour']),5)) 115 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['ETA_min']),6)) 116 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),19)) 117 118 return binary.joinBV(bvList)
119
120 -def decode(bv, validate=False):
121 '''Unpack a sls_lockorder message 122 123 Fields in params: 124 - vessel(aisstr6): Vessel Name 125 - direction(bool): Up bound/Down bound 126 - ETA_month(uint): Estimated time of arrival month 1..12 127 - ETA_day(uint): Estimated time of arrival day of the month 1..31 128 - ETA_hour(uint): Estimated time of arrival UTC hours 0..23 129 - ETA_min(uint): Estimated time of arrival minutes 130 - reserved(uint): Reserved bits for future use (field automatically set to "0") 131 @type bv: BitVector 132 @param bv: Bits defining a message 133 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 134 @rtype: dict 135 @return: params 136 ''' 137 138 #Would be nice to check the bit count here.. 139 #if validate: 140 # assert (len(bv)==FIX: SOME NUMBER) 141 r = {} 142 r['vessel']=aisstring.decode(bv[0:90]) 143 r['direction']=bool(int(bv[90:91])) 144 r['ETA_month']=int(bv[91:95]) 145 r['ETA_day']=int(bv[95:100]) 146 r['ETA_hour']=int(bv[100:105]) 147 r['ETA_min']=int(bv[105:111]) 148 r['reserved']=0 149 return r
150
151 -def decodevessel(bv, validate=False):
152 return aisstring.decode(bv[0:90])
153
154 -def decodedirection(bv, validate=False):
155 return bool(int(bv[90:91]))
156
157 -def decodeETA_month(bv, validate=False):
158 return int(bv[91:95])
159
160 -def decodeETA_day(bv, validate=False):
161 return int(bv[95:100])
162
163 -def decodeETA_hour(bv, validate=False):
164 return int(bv[100:105])
165
166 -def decodeETA_min(bv, validate=False):
167 return int(bv[105:111])
168
169 -def decodereserved(bv, validate=False):
170 return 0
171 172
173 -def printHtml(params, out=sys.stdout):
174 out.write("<h3>sls_lockorder<h3>\n") 175 out.write("<table border=\"1\">\n") 176 out.write("<tr bgcolor=\"orange\">\n") 177 out.write("<th align=\"left\">Field Name</th>\n") 178 out.write("<th align=\"left\">Type</th>\n") 179 out.write("<th align=\"left\">Value</th>\n") 180 out.write("<th align=\"left\">Value in Lookup Table</th>\n") 181 out.write("<th align=\"left\">Units</th>\n") 182 out.write("\n") 183 out.write("<tr>\n") 184 out.write("<td>vessel</td>\n") 185 out.write("<td>aisstr6</td>\n") 186 if 'vessel' in params: 187 out.write(" <td>"+str(params['vessel'])+"</td>\n") 188 out.write(" <td>"+str(params['vessel'])+"</td>\n") 189 out.write("</tr>\n") 190 out.write("\n") 191 out.write("<tr>\n") 192 out.write("<td>direction</td>\n") 193 out.write("<td>bool</td>\n") 194 if 'direction' in params: 195 out.write(" <td>"+str(params['direction'])+"</td>\n") 196 if str(params['direction']) in directionDecodeLut: 197 out.write("<td>"+directionDecodeLut[str(params['direction'])]+"</td>") 198 else: 199 out.write("<td><i>Missing LUT entry</i></td>") 200 out.write("</tr>\n") 201 out.write("\n") 202 out.write("<tr>\n") 203 out.write("<td>ETA_month</td>\n") 204 out.write("<td>uint</td>\n") 205 if 'ETA_month' in params: 206 out.write(" <td>"+str(params['ETA_month'])+"</td>\n") 207 out.write(" <td>"+str(params['ETA_month'])+"</td>\n") 208 out.write("</tr>\n") 209 out.write("\n") 210 out.write("<tr>\n") 211 out.write("<td>ETA_day</td>\n") 212 out.write("<td>uint</td>\n") 213 if 'ETA_day' in params: 214 out.write(" <td>"+str(params['ETA_day'])+"</td>\n") 215 out.write(" <td>"+str(params['ETA_day'])+"</td>\n") 216 out.write("</tr>\n") 217 out.write("\n") 218 out.write("<tr>\n") 219 out.write("<td>ETA_hour</td>\n") 220 out.write("<td>uint</td>\n") 221 if 'ETA_hour' in params: 222 out.write(" <td>"+str(params['ETA_hour'])+"</td>\n") 223 out.write(" <td>"+str(params['ETA_hour'])+"</td>\n") 224 out.write("</tr>\n") 225 out.write("\n") 226 out.write("<tr>\n") 227 out.write("<td>ETA_min</td>\n") 228 out.write("<td>uint</td>\n") 229 if 'ETA_min' in params: 230 out.write(" <td>"+str(params['ETA_min'])+"</td>\n") 231 out.write(" <td>"+str(params['ETA_min'])+"</td>\n") 232 out.write("</tr>\n") 233 out.write("\n") 234 out.write("<tr>\n") 235 out.write("<td>reserved</td>\n") 236 out.write("<td>uint</td>\n") 237 if 'reserved' in params: 238 out.write(" <td>"+str(params['reserved'])+"</td>\n") 239 out.write(" <td>"+str(params['reserved'])+"</td>\n") 240 out.write("</tr>\n") 241 out.write("</table>\n")
242
243 -def printFields(params, out=sys.stdout, format='std', fieldList=None, dbType='postgres'):
244 '''Print a sls_lockorder message to stdout. 245 246 Fields in params: 247 - vessel(aisstr6): Vessel Name 248 - direction(bool): Up bound/Down bound 249 - ETA_month(uint): Estimated time of arrival month 1..12 250 - ETA_day(uint): Estimated time of arrival day of the month 1..31 251 - ETA_hour(uint): Estimated time of arrival UTC hours 0..23 252 - ETA_min(uint): Estimated time of arrival minutes 253 - reserved(uint): Reserved bits for future use (field automatically set to "0") 254 @param params: Dictionary of field names/values. 255 @param out: File like object to write to 256 @rtype: stdout 257 @return: text to out 258 ''' 259 260 if 'std'==format: 261 out.write("sls_lockorder:\n") 262 if 'vessel' in params: out.write(" vessel: "+str(params['vessel'])+"\n") 263 if 'direction' in params: out.write(" direction: "+str(params['direction'])+"\n") 264 if 'ETA_month' in params: out.write(" ETA_month: "+str(params['ETA_month'])+"\n") 265 if 'ETA_day' in params: out.write(" ETA_day: "+str(params['ETA_day'])+"\n") 266 if 'ETA_hour' in params: out.write(" ETA_hour: "+str(params['ETA_hour'])+"\n") 267 if 'ETA_min' in params: out.write(" ETA_min: "+str(params['ETA_min'])+"\n") 268 if 'reserved' in params: out.write(" reserved: "+str(params['reserved'])+"\n") 269 elif 'csv'==format: 270 if None == options.fieldList: 271 options.fieldList = fieldList 272 needComma = False; 273 for field in fieldList: 274 if needComma: out.write(',') 275 needComma = True 276 if field in params: 277 out.write(str(params[field])) 278 # else: leave it empty 279 out.write("\n") 280 elif 'html'==format: 281 printHtml(params,out) 282 elif 'sql'==format: 283 sqlInsertStr(params,out,dbType=dbType) 284 else: 285 print "ERROR: unknown format:",format 286 assert False 287 288 return # Nothing to return
289 290 directionEncodeLut = { 291 'Down bound':'0', 292 'Up bound':'1', 293 } #directionEncodeLut 294 295 directionDecodeLut = { 296 '0':'Down bound', 297 '1':'Up bound', 298 } # directionEncodeLut 299 300 ###################################################################### 301 # SQL SUPPORT 302 ###################################################################### 303
304 -def sqlCreateStr(outfile=sys.stdout, fields=None, extraFields=None 305 ,addCoastGuardFields=True 306 ,dbType='postgres' 307 ):
308 ''' 309 Return the SQL CREATE command for this message type 310 @param outfile: file like object to print to. 311 @param fields: which fields to put in the create. Defaults to all. 312 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 313 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 314 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 315 @type addCoastGuardFields: bool 316 @return: sql create string 317 @rtype: str 318 319 @see: sqlCreate 320 ''' 321 outfile.write(str(sqlCreate(fields,extraFields,addCoastGuardFields,dbType=dbType)))
322
323 -def sqlCreate(fields=None, extraFields=None, addCoastGuardFields=True, dbType='postgres'):
324 ''' 325 Return the sqlhelp object to create the table. 326 327 @param fields: which fields to put in the create. Defaults to all. 328 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 329 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 330 @type addCoastGuardFields: bool 331 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 332 @return: An object that can be used to generate a return 333 @rtype: sqlhelp.create 334 ''' 335 if None == fields: fields = fieldList 336 import sqlhelp 337 c = sqlhelp.create('sls_lockorder',dbType=dbType) 338 c.addPrimaryKey() 339 if 'vessel' in fields: c.addVarChar('vessel',15) 340 if 'direction' in fields: c.addBool('direction') 341 if 'ETA_month' in fields: c.addInt ('ETA_month') 342 if 'ETA_day' in fields: c.addInt ('ETA_day') 343 if 'ETA_hour' in fields: c.addInt ('ETA_hour') 344 if 'ETA_min' in fields: c.addInt ('ETA_min') 345 if 'reserved' in fields: c.addInt ('reserved') 346 347 if addCoastGuardFields: 348 # c.addInt('cg_rssi') # Relative signal strength indicator 349 # c.addInt('cg_d') # dBm receive strength 350 # c.addInt('cg_T') # Receive timestamp from the AIS equipment 351 # c.addInt('cg_S') # Slot received in 352 # c.addVarChar('cg_x',10) # Idonno 353 c.addVarChar('cg_r',15) # Receiver station ID - should usually be an MMSI, but sometimes is a string 354 c.addInt('cg_sec') # UTC seconds since the epoch 355 356 c.addTimestamp('cg_timestamp') # UTC decoded cg_sec - not actually in the data stream 357 358 return c
359
360 -def sqlInsertStr(params, outfile=sys.stdout, extraParams=None, dbType='postgres'):
361 ''' 362 Return the SQL INSERT command for this message type 363 @param params: dictionary of values keyed by field name 364 @param outfile: file like object to print to. 365 @param extraParams: A sequence of tuples containing (name,sql type) for additional fields 366 @return: sql create string 367 @rtype: str 368 369 @see: sqlCreate 370 ''' 371 outfile.write(str(sqlInsert(params,extraParams,dbType=dbType)))
372 373
374 -def sqlInsert(params,extraParams=None,dbType='postgres'):
375 ''' 376 Give the SQL INSERT statement 377 @param params: dict keyed by field name of values 378 @param extraParams: any extra fields that you have created beyond the normal ais message fields 379 @rtype: sqlhelp.insert 380 @return: insert class instance 381 @todo: allow optional type checking of params? 382 @warning: this will take invalid keys happily and do what??? 383 ''' 384 import sqlhelp 385 i = sqlhelp.insert('sls_lockorder',dbType=dbType) 386 387 if dbType=='postgres': 388 finished = [] 389 for key in params: 390 if key in finished: 391 continue 392 393 if key not in toPgFields and key not in fromPgFields: 394 if type(params[key])==Decimal: i.add(key,float(params[key])) 395 else: i.add(key,params[key]) 396 else: 397 if key in fromPgFields: 398 val = params[key] 399 # Had better be a WKT type like POINT(-88.1 30.321) 400 i.addPostGIS(key,val) 401 finished.append(key) 402 else: 403 # Need to construct the type. 404 pgName = toPgFields[key] 405 #valStr='GeomFromText(\''+pgTypes[pgName]+'(' 406 valStr=pgTypes[pgName]+'(' 407 vals = [] 408 for nonPgKey in fromPgFields[pgName]: 409 vals.append(str(params[nonPgKey])) 410 finished.append(nonPgKey) 411 valStr+=' '.join(vals)+')' 412 i.addPostGIS(pgName,valStr) 413 else: 414 for key in params: 415 if type(params[key])==Decimal: i.add(key,float(params[key])) 416 else: i.add(key,params[key]) 417 418 if None != extraParams: 419 for key in extraParams: 420 i.add(key,extraParams[key]) 421 422 return i
423 424 425 ###################################################################### 426 # UNIT TESTING 427 ###################################################################### 428 import unittest
429 -def testParams():
430 '''Return a params file base on the testvalue tags. 431 @rtype: dict 432 @return: params based on testvalue tags 433 ''' 434 params = {} 435 params['vessel'] = 'ICEBERG@@@@@@@@' 436 params['direction'] = True 437 params['ETA_month'] = 2 438 params['ETA_day'] = 28 439 params['ETA_hour'] = 23 440 params['ETA_min'] = 45 441 params['reserved'] = 0 442 443 return params
444
445 -class Testsls_lockorder(unittest.TestCase):
446 '''Use testvalue tag text from each type to build test case the sls_lockorder message'''
447 - def testEncodeDecode(self):
448 449 params = testParams() 450 bits = encode(params) 451 r = decode(bits) 452 453 # Check that each parameter came through ok. 454 self.failUnlessEqual(r['vessel'],params['vessel']) 455 self.failUnlessEqual(r['direction'],params['direction']) 456 self.failUnlessEqual(r['ETA_month'],params['ETA_month']) 457 self.failUnlessEqual(r['ETA_day'],params['ETA_day']) 458 self.failUnlessEqual(r['ETA_hour'],params['ETA_hour']) 459 self.failUnlessEqual(r['ETA_min'],params['ETA_min']) 460 self.failUnlessEqual(r['reserved'],params['reserved'])
461
462 -def addMsgOptions(parser):
463 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 464 help='decode a "sls_lockorder" AIS message') 465 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 466 help='encode a "sls_lockorder" AIS message') 467 parser.add_option('--vessel-field', dest='vesselField',default='@@@@@@@@@@@@@@@',metavar='aisstr6',type='string' 468 ,help='Field parameter value [default: %default]') 469 parser.add_option('--direction-field', dest='directionField',metavar='bool',type='int' 470 ,help='Field parameter value [default: %default]') 471 parser.add_option('--ETA_month-field', dest='ETA_monthField',metavar='uint',type='int' 472 ,help='Field parameter value [default: %default]') 473 parser.add_option('--ETA_day-field', dest='ETA_dayField',metavar='uint',type='int' 474 ,help='Field parameter value [default: %default]') 475 parser.add_option('--ETA_hour-field', dest='ETA_hourField',metavar='uint',type='int' 476 ,help='Field parameter value [default: %default]') 477 parser.add_option('--ETA_min-field', dest='ETA_minField',metavar='uint',type='int' 478 ,help='Field parameter value [default: %default]')
479 480 ############################################################ 481 if __name__=='__main__': 482 483 from optparse import OptionParser 484 parser = OptionParser(usage="%prog [options]", 485 version="%prog "+__version__) 486 487 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 488 help='run the documentation tests') 489 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 490 help='run the unit tests') 491 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 492 help='Make the test output verbose') 493 494 # FIX: remove nmea from binary messages. No way to build the whole packet? 495 # FIX: or build the surrounding msg 8 for a broadcast? 496 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 497 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 498 ,default='nmeapayload' 499 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 500 501 502 outputChoices = ('std','html','csv','sql' ) 503 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 504 ,default='std' 505 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 506 507 parser.add_option('-o','--output',dest='outputFileName',default=None, 508 help='Name of the python file to write [default: stdout]') 509 510 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 511 choices=fieldList, 512 help='Which fields to include in the output. Currently only for csv output [default: all]') 513 514 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 515 help='Print the field name for csv') 516 517 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 518 help='Print out an sql create command for the table.') 519 520 dbChoices = ('sqlite','postgres') 521 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 522 ,choices=dbChoices,type='choice' 523 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 524 525 addMsgOptions(parser) 526 527 (options,args) = parser.parse_args() 528 success=True 529 530 if options.doctest: 531 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 532 sys.argv= [sys.argv[0]] 533 if options.verbose: sys.argv.append('-v') 534 import doctest 535 numfail,numtests=doctest.testmod() 536 if numfail==0: print 'ok' 537 else: 538 print 'FAILED' 539 success=False 540 541 if not success: sys.exit('Something Failed') 542 del success # Hide success from epydoc 543 544 if options.unittest: 545 sys.argv = [sys.argv[0]] 546 if options.verbose: sys.argv.append('-v') 547 unittest.main() 548 549 outfile = sys.stdout 550 if None!=options.outputFileName: 551 outfile = file(options.outputFileName,'w') 552 553 554 if options.doEncode: 555 # First make sure all non required options are specified 556 if None==options.vesselField: parser.error("missing value for vesselField") 557 if None==options.directionField: parser.error("missing value for directionField") 558 if None==options.ETA_monthField: parser.error("missing value for ETA_monthField") 559 if None==options.ETA_dayField: parser.error("missing value for ETA_dayField") 560 if None==options.ETA_hourField: parser.error("missing value for ETA_hourField") 561 if None==options.ETA_minField: parser.error("missing value for ETA_minField") 562 msgDict={ 563 'vessel': options.vesselField, 564 'direction': options.directionField, 565 'ETA_month': options.ETA_monthField, 566 'ETA_day': options.ETA_dayField, 567 'ETA_hour': options.ETA_hourField, 568 'ETA_min': options.ETA_minField, 569 'reserved': '0', 570 } 571 572 bits = encode(msgDict) 573 if 'binary'==options.ioType: print str(bits) 574 elif 'nmeapayload'==options.ioType: 575 # FIX: figure out if this might be necessary at compile time 576 print "bitLen",len(bits) 577 bitLen=len(bits) 578 if bitLen%6!=0: 579 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 580 print "result:",binary.bitvectoais6(bits)[0] 581 582 583 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 584 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 585 else: sys.exit('ERROR: unknown ioType. Help!') 586 587 588 if options.sqlCreate: 589 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 590 591 if options.printCsvfieldList: 592 # Make a csv separated list of fields that will be displayed for csv 593 if None == options.fieldList: options.fieldList = fieldList 594 import StringIO 595 buf = StringIO.StringIO() 596 for field in options.fieldList: 597 buf.write(field+',') 598 result = buf.getvalue() 599 if result[-1] == ',': print result[:-1] 600 else: print result 601 602 if options.doDecode: 603 for msg in args: 604 bv = None 605 606 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 607 # Found nmea 608 # FIX: do checksum 609 bv = binary.ais6tobitvec(msg.split(',')[5]) 610 else: # either binary or nmeapayload... expect mostly nmeapayloads 611 # assumes that an all 0 and 1 string can not be a nmeapayload 612 binaryMsg=True 613 for c in msg: 614 if c not in ('0','1'): 615 binaryMsg=False 616 break 617 if binaryMsg: 618 bv = BitVector(bitstring=msg) 619 else: # nmeapayload 620 bv = binary.ais6tobitvec(msg) 621 622 printFields(decode(bv) 623 ,out=outfile 624 ,format=options.outputType 625 ,fieldList=options.fieldList 626 ,dbType=options.dbType 627 ) 628