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

  1  #!/usr/bin/env python 
  2   
  3  __version__ = '$Revision: 4791 $'.split()[1] 
  4  __date__ = '$Date: 2007-02-16 $'.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 reserved 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("reserved:\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 #print 'already did key',key 392 continue 393 394 if key not in toPgFields and key not in fromPgFields: 395 if type(params[key])==Decimal: i.add(key,float(params[key])) 396 else: i.add(key,params[key]) 397 else: 398 if key in fromPgFields: 399 val = params[key] 400 # Had better be a WKT type like POINT(-88.1 30.321) 401 i.addPostGIS(key,val) 402 finished.append(key) 403 else: 404 # Need to construct the type. 405 pgName = toPgFields[key] 406 #valStr='GeomFromText(\''+pgTypes[pgName]+'(' 407 valStr=pgTypes[pgName]+'(' 408 vals = [] 409 for nonPgKey in fromPgFields[pgName]: 410 vals.append(str(params[nonPgKey])) 411 finished.append(nonPgKey) 412 valStr+=' '.join(vals)+')' 413 i.addPostGIS(pgName,valStr) 414 else: 415 for key in params: 416 if type(params[key])==Decimal: i.add(key,float(params[key])) 417 else: i.add(key,params[key]) 418 419 if None != extraParams: 420 for key in extraParams: 421 i.add(key,extraParams[key]) 422 423 return i
424 425 426 ###################################################################### 427 # UNIT TESTING 428 ###################################################################### 429 import unittest
430 -def testParams():
431 '''Return a params file base on the testvalue tags. 432 @rtype: dict 433 @return: params based on testvalue tags 434 ''' 435 params = {} 436 params['vessel'] = 'ICEBERG@@@@@@@@' 437 params['direction'] = True 438 params['ETA_month'] = 2 439 params['ETA_day'] = 28 440 params['ETA_hour'] = 23 441 params['ETA_min'] = 45 442 params['reserved'] = 0 443 444 return params
445
446 -class Testsls_lockorder(unittest.TestCase):
447 '''Use testvalue tag text from each type to build test case the sls_lockorder message'''
448 - def testEncodeDecode(self):
449 450 params = testParams() 451 bits = encode(params) 452 r = decode(bits) 453 454 # Check that each parameter came through ok. 455 self.failUnlessEqual(r['vessel'],params['vessel']) 456 self.failUnlessEqual(r['direction'],params['direction']) 457 self.failUnlessEqual(r['ETA_month'],params['ETA_month']) 458 self.failUnlessEqual(r['ETA_day'],params['ETA_day']) 459 self.failUnlessEqual(r['ETA_hour'],params['ETA_hour']) 460 self.failUnlessEqual(r['ETA_min'],params['ETA_min']) 461 self.failUnlessEqual(r['reserved'],params['reserved'])
462
463 -def addMsgOptions(parser):
464 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 465 help='decode a "sls_lockorder" AIS message') 466 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 467 help='encode a "sls_lockorder" AIS message') 468 parser.add_option('--vessel-field', dest='vesselField',default='@@@@@@@@@@@@@@@',metavar='aisstr6',type='string' 469 ,help='Field parameter value [default: %default]') 470 parser.add_option('--direction-field', dest='directionField',metavar='bool',type='int' 471 ,help='Field parameter value [default: %default]') 472 parser.add_option('--ETA_month-field', dest='ETA_monthField',metavar='uint',type='int' 473 ,help='Field parameter value [default: %default]') 474 parser.add_option('--ETA_day-field', dest='ETA_dayField',metavar='uint',type='int' 475 ,help='Field parameter value [default: %default]') 476 parser.add_option('--ETA_hour-field', dest='ETA_hourField',metavar='uint',type='int' 477 ,help='Field parameter value [default: %default]') 478 parser.add_option('--ETA_min-field', dest='ETA_minField',metavar='uint',type='int' 479 ,help='Field parameter value [default: %default]')
480 481 ############################################################ 482 if __name__=='__main__': 483 484 from optparse import OptionParser 485 parser = OptionParser(usage="%prog [options]", 486 version="%prog "+__version__) 487 488 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 489 help='run the documentation tests') 490 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 491 help='run the unit tests') 492 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 493 help='Make the test output verbose') 494 495 # FIX: remove nmea from binary messages. No way to build the whole packet? 496 # FIX: or build the surrounding msg 8 for a broadcast? 497 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 498 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 499 ,default='nmeapayload' 500 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 501 502 503 outputChoices = ('std','html','csv','sql' ) 504 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 505 ,default='std' 506 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 507 508 parser.add_option('-o','--output',dest='outputFileName',default=None, 509 help='Name of the python file to write [default: stdout]') 510 511 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 512 choices=fieldList, 513 help='Which fields to include in the output. Currently only for csv output [default: all]') 514 515 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 516 help='Print the field name for csv') 517 518 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 519 help='Print out an sql create command for the table.') 520 521 dbChoices = ('sqlite','postgres') 522 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 523 ,choices=dbChoices,type='choice' 524 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 525 526 addMsgOptions(parser) 527 528 (options,args) = parser.parse_args() 529 success=True 530 531 if options.doctest: 532 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 533 sys.argv= [sys.argv[0]] 534 if options.verbose: sys.argv.append('-v') 535 import doctest 536 numfail,numtests=doctest.testmod() 537 if numfail==0: print 'ok' 538 else: 539 print 'FAILED' 540 success=False 541 542 if not success: sys.exit('Something Failed') 543 del success # Hide success from epydoc 544 545 if options.unittest: 546 sys.argv = [sys.argv[0]] 547 if options.verbose: sys.argv.append('-v') 548 unittest.main() 549 550 outfile = sys.stdout 551 if None!=options.outputFileName: 552 outfile = file(options.outputFileName,'w') 553 554 555 if options.doEncode: 556 # First make sure all non required options are specified 557 if None==options.vesselField: parser.error("missing value for vesselField") 558 if None==options.directionField: parser.error("missing value for directionField") 559 if None==options.ETA_monthField: parser.error("missing value for ETA_monthField") 560 if None==options.ETA_dayField: parser.error("missing value for ETA_dayField") 561 if None==options.ETA_hourField: parser.error("missing value for ETA_hourField") 562 if None==options.ETA_minField: parser.error("missing value for ETA_minField") 563 msgDict={ 564 'vessel': options.vesselField, 565 'direction': options.directionField, 566 'ETA_month': options.ETA_monthField, 567 'ETA_day': options.ETA_dayField, 568 'ETA_hour': options.ETA_hourField, 569 'ETA_min': options.ETA_minField, 570 'reserved': '0', 571 } 572 573 bits = encode(msgDict) 574 if 'binary'==options.ioType: print str(bits) 575 elif 'nmeapayload'==options.ioType: 576 # FIX: figure out if this might be necessary at compile time 577 print "bitLen",len(bits) 578 bitLen=len(bits) 579 if bitLen%6!=0: 580 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 581 print "result:",binary.bitvectoais6(bits)[0] 582 583 584 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 585 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 586 else: sys.exit('ERROR: unknown ioType. Help!') 587 588 589 if options.sqlCreate: 590 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 591 592 if options.printCsvfieldList: 593 # Make a csv separated list of fields that will be displayed for csv 594 if None == options.fieldList: options.fieldList = fieldList 595 import StringIO 596 buf = StringIO.StringIO() 597 for field in options.fieldList: 598 buf.write(field+',') 599 result = buf.getvalue() 600 if result[-1] == ',': print result[:-1] 601 else: print result 602 603 if options.doDecode: 604 for msg in args: 605 bv = None 606 607 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 608 # Found nmea 609 # FIX: do checksum 610 bv = binary.ais6tobitvec(msg.split(',')[5]) 611 else: # either binary or nmeapayload... expect mostly nmeapayloads 612 # assumes that an all 0 and 1 string can not be a nmeapayload 613 binaryMsg=True 614 for c in msg: 615 if c not in ('0','1'): 616 binaryMsg=False 617 break 618 if binaryMsg: 619 bv = BitVector(bitstring=msg) 620 else: # nmeapayload 621 bv = binary.ais6tobitvec(msg) 622 623 printFields(decode(bv) 624 ,out=outfile 625 ,format=options.outputType 626 ,fieldList=options.fieldList 627 ,dbType=options.dbType 628 ) 629