Package ais :: Module ais_msg_12
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Source Code for Module ais.ais_msg_12

  1  #!/usr/bin/env python 
  2   
  3  __version__ = '$Revision: 4791 $'.split()[1] 
  4  __date__ = '$Date: 2007-03-18 $'.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          'MessageID', 
 51          'RepeatIndicator', 
 52          'UserID', 
 53          'SeqNum', 
 54          'DestinationID', 
 55          'RetransmitFlag', 
 56          'Spare', 
 57  ) 
 58   
 59  fieldListPostgres = ( 
 60          'MessageID', 
 61          'RepeatIndicator', 
 62          'UserID', 
 63          'SeqNum', 
 64          'DestinationID', 
 65          'RetransmitFlag', 
 66          'Spare', 
 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 asrm binary message payload to pack into an AIS Msg asrm. 89 90 Fields in params: 91 - MessageID(uint): AIS message number. Must be 6 (field automatically set to "6") 92 - RepeatIndicator(uint): Indicated how many times a message has been repeated 93 - UserID(uint): Unique ship identification number (MMSI). Also known as the Source ID 94 - SeqNum(uint): Sequence number as described in 5.3.1. Assigned to each station 95 - DestinationID(uint): Unique ship identification number (MMSI). 96 - RetransmitFlag(bool): Should the message be restransmitted? 97 - Spare(uint): Must be 0 (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 bvList.append(binary.setBitVectorSize(BitVector(intVal=6),6)) 107 if 'RepeatIndicator' in params: 108 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['RepeatIndicator']),2)) 109 else: 110 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2)) 111 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['UserID']),30)) 112 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['SeqNum']),2)) 113 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['DestinationID']),30)) 114 if params["RetransmitFlag"]: bvList.append(TrueBV) 115 else: bvList.append(FalseBV) 116 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),1)) 117 118 return binary.joinBV(bvList)
119
120 -def decode(bv, validate=False):
121 '''Unpack a asrm message 122 123 Fields in params: 124 - MessageID(uint): AIS message number. Must be 6 (field automatically set to "6") 125 - RepeatIndicator(uint): Indicated how many times a message has been repeated 126 - UserID(uint): Unique ship identification number (MMSI). Also known as the Source ID 127 - SeqNum(uint): Sequence number as described in 5.3.1. Assigned to each station 128 - DestinationID(uint): Unique ship identification number (MMSI). 129 - RetransmitFlag(bool): Should the message be restransmitted? 130 - Spare(uint): Must be 0 (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['MessageID']=6 143 r['RepeatIndicator']=int(bv[6:8]) 144 r['UserID']=int(bv[8:38]) 145 r['SeqNum']=int(bv[38:40]) 146 r['DestinationID']=int(bv[40:70]) 147 r['RetransmitFlag']=bool(int(bv[70:71])) 148 r['Spare']=0 149 return r
150
151 -def decodeMessageID(bv, validate=False):
152 return 6
153
154 -def decodeRepeatIndicator(bv, validate=False):
155 return int(bv[6:8])
156
157 -def decodeUserID(bv, validate=False):
158 return int(bv[8:38])
159
160 -def decodeSeqNum(bv, validate=False):
161 return int(bv[38:40])
162
163 -def decodeDestinationID(bv, validate=False):
164 return int(bv[40:70])
165
166 -def decodeRetransmitFlag(bv, validate=False):
167 return bool(int(bv[70:71]))
168
169 -def decodeSpare(bv, validate=False):
170 return 0
171 172
173 -def printHtml(params, out=sys.stdout):
174 out.write("<h3>asrm<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>MessageID</td>\n") 185 out.write("<td>uint</td>\n") 186 if 'MessageID' in params: 187 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 188 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 189 out.write("</tr>\n") 190 out.write("\n") 191 out.write("<tr>\n") 192 out.write("<td>RepeatIndicator</td>\n") 193 out.write("<td>uint</td>\n") 194 if 'RepeatIndicator' in params: 195 out.write(" <td>"+str(params['RepeatIndicator'])+"</td>\n") 196 if str(params['RepeatIndicator']) in RepeatIndicatorDecodeLut: 197 out.write("<td>"+RepeatIndicatorDecodeLut[str(params['RepeatIndicator'])]+"</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>UserID</td>\n") 204 out.write("<td>uint</td>\n") 205 if 'UserID' in params: 206 out.write(" <td>"+str(params['UserID'])+"</td>\n") 207 out.write(" <td>"+str(params['UserID'])+"</td>\n") 208 out.write("</tr>\n") 209 out.write("\n") 210 out.write("<tr>\n") 211 out.write("<td>SeqNum</td>\n") 212 out.write("<td>uint</td>\n") 213 if 'SeqNum' in params: 214 out.write(" <td>"+str(params['SeqNum'])+"</td>\n") 215 out.write(" <td>"+str(params['SeqNum'])+"</td>\n") 216 out.write("</tr>\n") 217 out.write("\n") 218 out.write("<tr>\n") 219 out.write("<td>DestinationID</td>\n") 220 out.write("<td>uint</td>\n") 221 if 'DestinationID' in params: 222 out.write(" <td>"+str(params['DestinationID'])+"</td>\n") 223 out.write(" <td>"+str(params['DestinationID'])+"</td>\n") 224 out.write("</tr>\n") 225 out.write("\n") 226 out.write("<tr>\n") 227 out.write("<td>RetransmitFlag</td>\n") 228 out.write("<td>bool</td>\n") 229 if 'RetransmitFlag' in params: 230 out.write(" <td>"+str(params['RetransmitFlag'])+"</td>\n") 231 out.write(" <td>"+str(params['RetransmitFlag'])+"</td>\n") 232 out.write("</tr>\n") 233 out.write("\n") 234 out.write("<tr>\n") 235 out.write("<td>Spare</td>\n") 236 out.write("<td>uint</td>\n") 237 if 'Spare' in params: 238 out.write(" <td>"+str(params['Spare'])+"</td>\n") 239 out.write(" <td>"+str(params['Spare'])+"</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 asrm message to stdout. 245 246 Fields in params: 247 - MessageID(uint): AIS message number. Must be 6 (field automatically set to "6") 248 - RepeatIndicator(uint): Indicated how many times a message has been repeated 249 - UserID(uint): Unique ship identification number (MMSI). Also known as the Source ID 250 - SeqNum(uint): Sequence number as described in 5.3.1. Assigned to each station 251 - DestinationID(uint): Unique ship identification number (MMSI). 252 - RetransmitFlag(bool): Should the message be restransmitted? 253 - Spare(uint): Must be 0 (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("asrm:\n") 262 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n") 263 if 'RepeatIndicator' in params: out.write(" RepeatIndicator: "+str(params['RepeatIndicator'])+"\n") 264 if 'UserID' in params: out.write(" UserID: "+str(params['UserID'])+"\n") 265 if 'SeqNum' in params: out.write(" SeqNum: "+str(params['SeqNum'])+"\n") 266 if 'DestinationID' in params: out.write(" DestinationID: "+str(params['DestinationID'])+"\n") 267 if 'RetransmitFlag' in params: out.write(" RetransmitFlag: "+str(params['RetransmitFlag'])+"\n") 268 if 'Spare' in params: out.write(" Spare: "+str(params['Spare'])+"\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 RepeatIndicatorEncodeLut = { 291 'default':'0', 292 'do not repeat any more':'3', 293 } #RepeatIndicatorEncodeLut 294 295 RepeatIndicatorDecodeLut = { 296 '0':'default', 297 '3':'do not repeat any more', 298 } # RepeatIndicatorEncodeLut 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('asrm',dbType=dbType) 338 c.addPrimaryKey() 339 if 'MessageID' in fields: c.addInt ('MessageID') 340 if 'RepeatIndicator' in fields: c.addInt ('RepeatIndicator') 341 if 'UserID' in fields: c.addInt ('UserID') 342 if 'SeqNum' in fields: c.addInt ('SeqNum') 343 if 'DestinationID' in fields: c.addInt ('DestinationID') 344 if 'RetransmitFlag' in fields: c.addBool('RetransmitFlag') 345 if 'Spare' in fields: c.addInt ('Spare') 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('asrm',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['MessageID'] = 6 436 params['RepeatIndicator'] = 1 437 params['UserID'] = 1193046 438 params['SeqNum'] = 3 439 params['DestinationID'] = 1193047 440 params['RetransmitFlag'] = True 441 params['Spare'] = 0 442 443 return params
444
445 -class Testasrm(unittest.TestCase):
446 '''Use testvalue tag text from each type to build test case the asrm 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['MessageID'],params['MessageID']) 455 self.failUnlessEqual(r['RepeatIndicator'],params['RepeatIndicator']) 456 self.failUnlessEqual(r['UserID'],params['UserID']) 457 self.failUnlessEqual(r['SeqNum'],params['SeqNum']) 458 self.failUnlessEqual(r['DestinationID'],params['DestinationID']) 459 self.failUnlessEqual(r['RetransmitFlag'],params['RetransmitFlag']) 460 self.failUnlessEqual(r['Spare'],params['Spare'])
461
462 -def addMsgOptions(parser):
463 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 464 help='decode a "asrm" AIS message') 465 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 466 help='encode a "asrm" AIS message') 467 parser.add_option('--RepeatIndicator-field', dest='RepeatIndicatorField',default=0,metavar='uint',type='int' 468 ,help='Field parameter value [default: %default]') 469 parser.add_option('--UserID-field', dest='UserIDField',metavar='uint',type='int' 470 ,help='Field parameter value [default: %default]') 471 parser.add_option('--SeqNum-field', dest='SeqNumField',metavar='uint',type='int' 472 ,help='Field parameter value [default: %default]') 473 parser.add_option('--DestinationID-field', dest='DestinationIDField',metavar='uint',type='int' 474 ,help='Field parameter value [default: %default]') 475 parser.add_option('--RetransmitFlag-field', dest='RetransmitFlagField',metavar='bool',type='int' 476 ,help='Field parameter value [default: %default]')
477 478 ############################################################ 479 if __name__=='__main__': 480 481 from optparse import OptionParser 482 parser = OptionParser(usage="%prog [options]", 483 version="%prog "+__version__) 484 485 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 486 help='run the documentation tests') 487 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 488 help='run the unit tests') 489 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 490 help='Make the test output verbose') 491 492 # FIX: remove nmea from binary messages. No way to build the whole packet? 493 # FIX: or build the surrounding msg 8 for a broadcast? 494 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 495 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 496 ,default='nmeapayload' 497 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 498 499 500 outputChoices = ('std','html','csv','sql' ) 501 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 502 ,default='std' 503 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 504 505 parser.add_option('-o','--output',dest='outputFileName',default=None, 506 help='Name of the python file to write [default: stdout]') 507 508 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 509 choices=fieldList, 510 help='Which fields to include in the output. Currently only for csv output [default: all]') 511 512 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 513 help='Print the field name for csv') 514 515 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 516 help='Print out an sql create command for the table.') 517 518 dbChoices = ('sqlite','postgres') 519 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 520 ,choices=dbChoices,type='choice' 521 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 522 523 addMsgOptions(parser) 524 525 (options,args) = parser.parse_args() 526 success=True 527 528 if options.doctest: 529 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 530 sys.argv= [sys.argv[0]] 531 if options.verbose: sys.argv.append('-v') 532 import doctest 533 numfail,numtests=doctest.testmod() 534 if numfail==0: print 'ok' 535 else: 536 print 'FAILED' 537 success=False 538 539 if not success: sys.exit('Something Failed') 540 del success # Hide success from epydoc 541 542 if options.unittest: 543 sys.argv = [sys.argv[0]] 544 if options.verbose: sys.argv.append('-v') 545 unittest.main() 546 547 outfile = sys.stdout 548 if None!=options.outputFileName: 549 outfile = file(options.outputFileName,'w') 550 551 552 if options.doEncode: 553 # First make sure all non required options are specified 554 if None==options.RepeatIndicatorField: parser.error("missing value for RepeatIndicatorField") 555 if None==options.UserIDField: parser.error("missing value for UserIDField") 556 if None==options.SeqNumField: parser.error("missing value for SeqNumField") 557 if None==options.DestinationIDField: parser.error("missing value for DestinationIDField") 558 if None==options.RetransmitFlagField: parser.error("missing value for RetransmitFlagField") 559 msgDict={ 560 'MessageID': '6', 561 'RepeatIndicator': options.RepeatIndicatorField, 562 'UserID': options.UserIDField, 563 'SeqNum': options.SeqNumField, 564 'DestinationID': options.DestinationIDField, 565 'RetransmitFlag': options.RetransmitFlagField, 566 'Spare': '0', 567 } 568 569 bits = encode(msgDict) 570 if 'binary'==options.ioType: print str(bits) 571 elif 'nmeapayload'==options.ioType: 572 # FIX: figure out if this might be necessary at compile time 573 print "bitLen",len(bits) 574 bitLen=len(bits) 575 if bitLen%6!=0: 576 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 577 print "result:",binary.bitvectoais6(bits)[0] 578 579 580 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 581 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 582 else: sys.exit('ERROR: unknown ioType. Help!') 583 584 585 if options.sqlCreate: 586 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 587 588 if options.printCsvfieldList: 589 # Make a csv separated list of fields that will be displayed for csv 590 if None == options.fieldList: options.fieldList = fieldList 591 import StringIO 592 buf = StringIO.StringIO() 593 for field in options.fieldList: 594 buf.write(field+',') 595 result = buf.getvalue() 596 if result[-1] == ',': print result[:-1] 597 else: print result 598 599 if options.doDecode: 600 for msg in args: 601 bv = None 602 603 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 604 # Found nmea 605 # FIX: do checksum 606 bv = binary.ais6tobitvec(msg.split(',')[5]) 607 else: # either binary or nmeapayload... expect mostly nmeapayloads 608 # assumes that an all 0 and 1 string can not be a nmeapayload 609 binaryMsg=True 610 for c in msg: 611 if c not in ('0','1'): 612 binaryMsg=False 613 break 614 if binaryMsg: 615 bv = BitVector(bitstring=msg) 616 else: # nmeapayload 617 bv = binary.ais6tobitvec(msg) 618 619 printFields(decode(bv) 620 ,out=outfile 621 ,format=options.outputType 622 ,fieldList=options.fieldList 623 ,dbType=options.dbType 624 ) 625