ais.ais_msg

1 #!/usr/bin/env python 2 3 __version__ = '$Revision: 4791 $'.split()[1] 4 __date__ = '$Date: 2008-01-09 $'.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 'type', 54 'name', 55 'PositionAccuracy', 56 'longitude', 57 'latitude', 58 'dim', 59 'FixType', 60 'timestamp', 61 'OffPosition', 62 'RegionalApp', 63 'RAIM', 64 'Spare', 65 ) 66 67 fieldListPostgres = ( 68 'MessageID', 69 'RepeatIndicator', 70 'UserID', 71 'type', 72 'name', 73 'PositionAccuracy', 74 'Position', # PostGIS data type 75 'dim', 76 'FixType', 77 'timestamp', 78 'OffPosition', 79 'RegionalApp', 80 'RAIM', 81 'Spare', 82 ) 83 84 toPgFields = { 85 'longitude':'Position', 86 'latitude':'Position', 87 } 88 ''' 89 Go to the Postgis field names from the straight field name 90 ''' 91 92 fromPgFields = { 93 'Position':('longitude','latitude',), 94 } 95 ''' 96 Go from the Postgis field names to the straight field name 97 ''' 98 99 pgTypes = { 100 'Position':'POINT', 101 } 102 ''' 103 Lookup table for each postgis field name to get its type. 104 ''' 105

106 -def encode(params, validate=False):

107 '''Create a AidsToNavReport binary message payload to pack into an AIS Msg AidsToNavReport. 108 109 Fields in params: 110 - MessageID(uint): AIS message number. Must be 21 aka 'F' (field automatically set to "21") 111 - RepeatIndicator(uint): Indicated how many times a message has been repeated 112 - UserID(uint): Unique ship identification number (MMSI) 113 - type(uint): IALA type of aid-to-navigation 114 - name(aisstr6): Name of the aid-to-navigation 115 - PositionAccuracy(uint): Accuracy of positioning fixes 116 - longitude(decimal): Location of the AtoN East West location 117 - latitude(decimal): Location of the AtoN North South location 118 - dim(uint): FIX: break this out. 119 - FixType(uint): Type of electronic position fixing device 120 - timestamp(uint): UTC second when report was generated 121 - OffPosition(bool): True when the AtoN is off station 122 - RegionalApp(uint): Should be set to zero (field automatically set to "0") 123 - RAIM(bool): Receiver autonomous integrity monitoring flag 124 - Spare(uint): Not Used (field automatically set to "0") 125 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing 126 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 127 @rtype: BitVector 128 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8 129 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits. 130 ''' 131 132 bvList = [] 133 bvList.append(binary.setBitVectorSize(BitVector(intVal=21),6)) 134 if 'RepeatIndicator' in params: 135 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['RepeatIndicator']),2)) 136 else: 137 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2)) 138 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['UserID']),30)) 139 if 'type' in params: 140 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['type']),5)) 141 else: 142 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),5)) 143 if 'name' in params: 144 bvList.append(aisstring.encode(params['name'],120)) 145 else: 146 bvList.append(aisstring.encode('@@@@@@@@@@@@@@@@@@@@',120)) 147 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['PositionAccuracy']),1)) 148 if 'longitude' in params: 149 bvList.append(binary.bvFromSignedInt(int(Decimal(params['longitude'])*Decimal('600000')),28)) 150 else: 151 bvList.append(binary.bvFromSignedInt(108600000,28)) 152 if 'latitude' in params: 153 bvList.append(binary.bvFromSignedInt(int(Decimal(params['latitude'])*Decimal('600000')),27)) 154 else: 155 bvList.append(binary.bvFromSignedInt(54600000,27)) 156 if 'dim' in params: 157 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['dim']),30)) 158 else: 159 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),30)) 160 if 'FixType' in params: 161 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['FixType']),4)) 162 else: 163 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),4)) 164 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['timestamp']),6)) 165 if params["OffPosition"]: bvList.append(TrueBV) 166 else: bvList.append(FalseBV) 167 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),8)) 168 if params["RAIM"]: bvList.append(TrueBV) 169 else: bvList.append(FalseBV) 170 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),3)) 171 172 return binary.joinBV(bvList)

173

174 -def decode(bv, validate=False):

175 '''Unpack a AidsToNavReport message 176 177 Fields in params: 178 - MessageID(uint): AIS message number. Must be 21 aka 'F' (field automatically set to "21") 179 - RepeatIndicator(uint): Indicated how many times a message has been repeated 180 - UserID(uint): Unique ship identification number (MMSI) 181 - type(uint): IALA type of aid-to-navigation 182 - name(aisstr6): Name of the aid-to-navigation 183 - PositionAccuracy(uint): Accuracy of positioning fixes 184 - longitude(decimal): Location of the AtoN East West location 185 - latitude(decimal): Location of the AtoN North South location 186 - dim(uint): FIX: break this out. 187 - FixType(uint): Type of electronic position fixing device 188 - timestamp(uint): UTC second when report was generated 189 - OffPosition(bool): True when the AtoN is off station 190 - RegionalApp(uint): Should be set to zero (field automatically set to "0") 191 - RAIM(bool): Receiver autonomous integrity monitoring flag 192 - Spare(uint): Not Used (field automatically set to "0") 193 @type bv: BitVector 194 @param bv: Bits defining a message 195 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 196 @rtype: dict 197 @return: params 198 ''' 199 200 #Would be nice to check the bit count here.. 201 #if validate: 202 # assert (len(bv)==FIX: SOME NUMBER) 203 r = {} 204 r['MessageID']=21 205 r['RepeatIndicator']=int(bv[6:8]) 206 r['UserID']=int(bv[8:38]) 207 r['type']=int(bv[38:43]) 208 r['name']=aisstring.decode(bv[43:163]) 209 r['PositionAccuracy']=int(bv[163:164]) 210 r['longitude']=Decimal(binary.signedIntFromBV(bv[164:192]))/Decimal('600000') 211 r['latitude']=Decimal(binary.signedIntFromBV(bv[192:219]))/Decimal('600000') 212 r['dim']=int(bv[219:249]) 213 r['FixType']=int(bv[249:253]) 214 r['timestamp']=int(bv[253:259]) 215 r['OffPosition']=bool(int(bv[259:260])) 216 r['RegionalApp']=0 217 r['RAIM']=bool(int(bv[268:269])) 218 r['Spare']=0 219 return r

220

221 -def decodeMessageID(bv, validate=False):

222 return 21

223

224 -def decodeRepeatIndicator(bv, validate=False):

225 return int(bv[6:8])

226

227 -def decodeUserID(bv, validate=False):

228 return int(bv[8:38])

229

230 -def decodetype(bv, validate=False):

231 return int(bv[38:43])

232

233 -def decodename(bv, validate=False):

234 return aisstring.decode(bv[43:163])

235

236 -def decodePositionAccuracy(bv, validate=False):

237 return int(bv[163:164])

238

239 -def decodelongitude(bv, validate=False):

240 return Decimal(binary.signedIntFromBV(bv[164:192]))/Decimal('600000')

241

242 -def decodelatitude(bv, validate=False):

243 return Decimal(binary.signedIntFromBV(bv[192:219]))/Decimal('600000')

244

245 -def decodedim(bv, validate=False):

246 return int(bv[219:249])

247

248 -def decodeFixType(bv, validate=False):

249 return int(bv[249:253])

250

251 -def decodetimestamp(bv, validate=False):

252 return int(bv[253:259])

253

254 -def decodeOffPosition(bv, validate=False):

255 return bool(int(bv[259:260]))

256

257 -def decodeRegionalApp(bv, validate=False):

258 return 0

259

260 -def decodeRAIM(bv, validate=False):

261 return bool(int(bv[268:269]))

262

263 -def decodeSpare(bv, validate=False):

264 return 0

265 266

267 -def printHtml(params, out=sys.stdout):

268 out.write("<h3>AidsToNavReport</h3>\n") 269 out.write("<table border=\"1\">\n") 270 out.write("<tr bgcolor=\"orange\">\n") 271 out.write("<th align=\"left\">Field Name</th>\n") 272 out.write("<th align=\"left\">Type</th>\n") 273 out.write("<th align=\"left\">Value</th>\n") 274 out.write("<th align=\"left\">Value in Lookup Table</th>\n") 275 out.write("<th align=\"left\">Units</th>\n") 276 out.write("\n") 277 out.write("<tr>\n") 278 out.write("<td>MessageID</td>\n") 279 out.write("<td>uint</td>\n") 280 if 'MessageID' in params: 281 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 282 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 283 out.write("</tr>\n") 284 out.write("\n") 285 out.write("<tr>\n") 286 out.write("<td>RepeatIndicator</td>\n") 287 out.write("<td>uint</td>\n") 288 if 'RepeatIndicator' in params: 289 out.write(" <td>"+str(params['RepeatIndicator'])+"</td>\n") 290 if str(params['RepeatIndicator']) in RepeatIndicatorDecodeLut: 291 out.write("<td>"+RepeatIndicatorDecodeLut[str(params['RepeatIndicator'])]+"</td>") 292 else: 293 out.write("<td><i>Missing LUT entry</i></td>") 294 out.write("</tr>\n") 295 out.write("\n") 296 out.write("<tr>\n") 297 out.write("<td>UserID</td>\n") 298 out.write("<td>uint</td>\n") 299 if 'UserID' in params: 300 out.write(" <td>"+str(params['UserID'])+"</td>\n") 301 out.write(" <td>"+str(params['UserID'])+"</td>\n") 302 out.write("</tr>\n") 303 out.write("\n") 304 out.write("<tr>\n") 305 out.write("<td>type</td>\n") 306 out.write("<td>uint</td>\n") 307 if 'type' in params: 308 out.write(" <td>"+str(params['type'])+"</td>\n") 309 if str(params['type']) in typeDecodeLut: 310 out.write("<td>"+typeDecodeLut[str(params['type'])]+"</td>") 311 else: 312 out.write("<td><i>Missing LUT entry</i></td>") 313 out.write("</tr>\n") 314 out.write("\n") 315 out.write("<tr>\n") 316 out.write("<td>name</td>\n") 317 out.write("<td>aisstr6</td>\n") 318 if 'name' in params: 319 out.write(" <td>"+str(params['name'])+"</td>\n") 320 out.write(" <td>"+str(params['name'])+"</td>\n") 321 out.write("</tr>\n") 322 out.write("\n") 323 out.write("<tr>\n") 324 out.write("<td>PositionAccuracy</td>\n") 325 out.write("<td>uint</td>\n") 326 if 'PositionAccuracy' in params: 327 out.write(" <td>"+str(params['PositionAccuracy'])+"</td>\n") 328 if str(params['PositionAccuracy']) in PositionAccuracyDecodeLut: 329 out.write("<td>"+PositionAccuracyDecodeLut[str(params['PositionAccuracy'])]+"</td>") 330 else: 331 out.write("<td><i>Missing LUT entry</i></td>") 332 out.write("</tr>\n") 333 out.write("\n") 334 out.write("<tr>\n") 335 out.write("<td>longitude</td>\n") 336 out.write("<td>decimal</td>\n") 337 if 'longitude' in params: 338 out.write(" <td>"+str(params['longitude'])+"</td>\n") 339 out.write(" <td>"+str(params['longitude'])+"</td>\n") 340 out.write("<td>degrees</td>\n") 341 out.write("</tr>\n") 342 out.write("\n") 343 out.write("<tr>\n") 344 out.write("<td>latitude</td>\n") 345 out.write("<td>decimal</td>\n") 346 if 'latitude' in params: 347 out.write(" <td>"+str(params['latitude'])+"</td>\n") 348 out.write(" <td>"+str(params['latitude'])+"</td>\n") 349 out.write("<td>degrees</td>\n") 350 out.write("</tr>\n") 351 out.write("\n") 352 out.write("<tr>\n") 353 out.write("<td>dim</td>\n") 354 out.write("<td>uint</td>\n") 355 if 'dim' in params: 356 out.write(" <td>"+str(params['dim'])+"</td>\n") 357 out.write(" <td>"+str(params['dim'])+"</td>\n") 358 out.write("</tr>\n") 359 out.write("\n") 360 out.write("<tr>\n") 361 out.write("<td>FixType</td>\n") 362 out.write("<td>uint</td>\n") 363 if 'FixType' in params: 364 out.write(" <td>"+str(params['FixType'])+"</td>\n") 365 if str(params['FixType']) in FixTypeDecodeLut: 366 out.write("<td>"+FixTypeDecodeLut[str(params['FixType'])]+"</td>") 367 else: 368 out.write("<td><i>Missing LUT entry</i></td>") 369 out.write("</tr>\n") 370 out.write("\n") 371 out.write("<tr>\n") 372 out.write("<td>timestamp</td>\n") 373 out.write("<td>uint</td>\n") 374 if 'timestamp' in params: 375 out.write(" <td>"+str(params['timestamp'])+"</td>\n") 376 if str(params['timestamp']) in timestampDecodeLut: 377 out.write("<td>"+timestampDecodeLut[str(params['timestamp'])]+"</td>") 378 else: 379 out.write("<td><i>Missing LUT entry</i></td>") 380 out.write("</tr>\n") 381 out.write("\n") 382 out.write("<tr>\n") 383 out.write("<td>OffPosition</td>\n") 384 out.write("<td>bool</td>\n") 385 if 'OffPosition' in params: 386 out.write(" <td>"+str(params['OffPosition'])+"</td>\n") 387 if str(params['OffPosition']) in OffPositionDecodeLut: 388 out.write("<td>"+OffPositionDecodeLut[str(params['OffPosition'])]+"</td>") 389 else: 390 out.write("<td><i>Missing LUT entry</i></td>") 391 out.write("</tr>\n") 392 out.write("\n") 393 out.write("<tr>\n") 394 out.write("<td>RegionalApp</td>\n") 395 out.write("<td>uint</td>\n") 396 if 'RegionalApp' in params: 397 out.write(" <td>"+str(params['RegionalApp'])+"</td>\n") 398 out.write(" <td>"+str(params['RegionalApp'])+"</td>\n") 399 out.write("</tr>\n") 400 out.write("\n") 401 out.write("<tr>\n") 402 out.write("<td>RAIM</td>\n") 403 out.write("<td>bool</td>\n") 404 if 'RAIM' in params: 405 out.write(" <td>"+str(params['RAIM'])+"</td>\n") 406 if str(params['RAIM']) in RAIMDecodeLut: 407 out.write("<td>"+RAIMDecodeLut[str(params['RAIM'])]+"</td>") 408 else: 409 out.write("<td><i>Missing LUT entry</i></td>") 410 out.write("</tr>\n") 411 out.write("\n") 412 out.write("<tr>\n") 413 out.write("<td>Spare</td>\n") 414 out.write("<td>uint</td>\n") 415 if 'Spare' in params: 416 out.write(" <td>"+str(params['Spare'])+"</td>\n") 417 out.write(" <td>"+str(params['Spare'])+"</td>\n") 418 out.write("</tr>\n") 419 out.write("</table>\n")

420 421

422 -def printKml(params, out=sys.stdout):

423 '''KML (Keyhole Markup Language) for Google Earth, but without the header/footer''' 424 out.write("\ <Placemark>\n") 425 out.write("\t <name>"+str(params['UserID'])+"</name>\n") 426 out.write("\t\t<description>\n") 427 import StringIO 428 buf = StringIO.StringIO() 429 printHtml(params,buf) 430 import cgi 431 out.write(cgi.escape(buf.getvalue())) 432 out.write("\t\t</description>\n") 433 out.write("\t\t<styleUrl>#m_ylw-pushpin_copy0</styleUrl>\n") 434 out.write("\t\t<Point>\n") 435 out.write("\t\t\t<coordinates>") 436 out.write(str(params['longitude'])) 437 out.write(',') 438 out.write(str(params['latitude'])) 439 out.write(",0</coordinates>\n") 440 out.write("\t\t</Point>\n") 441 out.write("\t</Placemark>\n")

442

443 -def printFields(params, out=sys.stdout, format='std', fieldList=None, dbType='postgres'):

444 '''Print a AidsToNavReport message to stdout. 445 446 Fields in params: 447 - MessageID(uint): AIS message number. Must be 21 aka 'F' (field automatically set to "21") 448 - RepeatIndicator(uint): Indicated how many times a message has been repeated 449 - UserID(uint): Unique ship identification number (MMSI) 450 - type(uint): IALA type of aid-to-navigation 451 - name(aisstr6): Name of the aid-to-navigation 452 - PositionAccuracy(uint): Accuracy of positioning fixes 453 - longitude(decimal): Location of the AtoN East West location 454 - latitude(decimal): Location of the AtoN North South location 455 - dim(uint): FIX: break this out. 456 - FixType(uint): Type of electronic position fixing device 457 - timestamp(uint): UTC second when report was generated 458 - OffPosition(bool): True when the AtoN is off station 459 - RegionalApp(uint): Should be set to zero (field automatically set to "0") 460 - RAIM(bool): Receiver autonomous integrity monitoring flag 461 - Spare(uint): Not Used (field automatically set to "0") 462 @param params: Dictionary of field names/values. 463 @param out: File like object to write to 464 @rtype: stdout 465 @return: text to out 466 ''' 467 468 if 'std'==format: 469 out.write("AidsToNavReport:\n") 470 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n") 471 if 'RepeatIndicator' in params: out.write(" RepeatIndicator: "+str(params['RepeatIndicator'])+"\n") 472 if 'UserID' in params: out.write(" UserID: "+str(params['UserID'])+"\n") 473 if 'type' in params: out.write(" type: "+str(params['type'])+"\n") 474 if 'name' in params: out.write(" name: "+str(params['name'])+"\n") 475 if 'PositionAccuracy' in params: out.write(" PositionAccuracy: "+str(params['PositionAccuracy'])+"\n") 476 if 'longitude' in params: out.write(" longitude: "+str(params['longitude'])+"\n") 477 if 'latitude' in params: out.write(" latitude: "+str(params['latitude'])+"\n") 478 if 'dim' in params: out.write(" dim: "+str(params['dim'])+"\n") 479 if 'FixType' in params: out.write(" FixType: "+str(params['FixType'])+"\n") 480 if 'timestamp' in params: out.write(" timestamp: "+str(params['timestamp'])+"\n") 481 if 'OffPosition' in params: out.write(" OffPosition: "+str(params['OffPosition'])+"\n") 482 if 'RegionalApp' in params: out.write(" RegionalApp: "+str(params['RegionalApp'])+"\n") 483 if 'RAIM' in params: out.write(" RAIM: "+str(params['RAIM'])+"\n") 484 if 'Spare' in params: out.write(" Spare: "+str(params['Spare'])+"\n") 485 elif 'csv'==format: 486 if None == options.fieldList: 487 options.fieldList = fieldList 488 needComma = False; 489 for field in fieldList: 490 if needComma: out.write(',') 491 needComma = True 492 if field in params: 493 out.write(str(params[field])) 494 # else: leave it empty 495 out.write("\n") 496 elif 'html'==format: 497 printHtml(params,out) 498 elif 'sql'==format: 499 sqlInsertStr(params,out,dbType=dbType) 500 elif 'kml'==format: 501 printKml(params,out) 502 elif 'kml-full'==format: 503 out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n") 504 out.write("<kml xmlns=\"http://earth.google.com/kml/2.1\">\n") 505 out.write("<Document>\n") 506 out.write(" <name>AidsToNavReport</name>\n") 507 printKml(params,out) 508 out.write("</Document>\n") 509 out.write("</kml>\n") 510 else: 511 print "ERROR: unknown format:",format 512 assert False 513 514 return # Nothing to return

515 516 RepeatIndicatorEncodeLut = { 517 'default':'0', 518 'do not repeat any more':'3', 519 } #RepeatIndicatorEncodeLut 520 521 RepeatIndicatorDecodeLut = { 522 '0':'default', 523 '3':'do not repeat any more', 524 } # RepeatIndicatorEncodeLut 525 526 typeEncodeLut = { 527 'Default, Type of A to N not specified':'0', 528 'Reference point':'1', 529 'RACON':'2', 530 'Off Shore Structure':'3', 531 'Spare':'4', 532 'Light, without sectors':'5', 533 'Light, with sectors':'6', 534 'Leading Light Front':'7', 535 'Leading Light Rear':'8', 536 'Beacon, Cardinal N':'9', 537 'Beacon, Cardinal E':'10', 538 'Beacon, Cardinal S':'11', 539 'Beacon, Cardinal W':'12', 540 'Beacon, Port hand':'13', 541 'Beacon, Starbord hand':'14', 542 'Beacon, Preferred channel port hand':'15', 543 'Beacon, Preferred channel starboard hand':'16', 544 'Beacon, Isolated danger':'17', 545 'Beacon, Safe water':'18', 546 'Beacon, Special mark':'19', 547 'Cardinal Mark N':'20', 548 'Cardinal Mark E':'21', 549 'Cardinal Mark S':'22', 550 'Cardinal Mark W':'23', 551 'Port hand Mark':'24', 552 'Starbord hand Mark':'25', 553 'Preferred Channel Port hand':'26', 554 'Preferred Channel Starboard hand':'27', 555 'Isolated danger':'28', 556 'Safe water':'29', 557 'Special Mark':'30', 558 'Light Vessel/LANBY':'31', 559 } #typeEncodeLut 560 561 typeDecodeLut = { 562 '0':'Default, Type of A to N not specified', 563 '1':'Reference point', 564 '2':'RACON', 565 '3':'Off Shore Structure', 566 '4':'Spare', 567 '5':'Light, without sectors', 568 '6':'Light, with sectors', 569 '7':'Leading Light Front', 570 '8':'Leading Light Rear', 571 '9':'Beacon, Cardinal N', 572 '10':'Beacon, Cardinal E', 573 '11':'Beacon, Cardinal S', 574 '12':'Beacon, Cardinal W', 575 '13':'Beacon, Port hand', 576 '14':'Beacon, Starbord hand', 577 '15':'Beacon, Preferred channel port hand', 578 '16':'Beacon, Preferred channel starboard hand', 579 '17':'Beacon, Isolated danger', 580 '18':'Beacon, Safe water', 581 '19':'Beacon, Special mark', 582 '20':'Cardinal Mark N', 583 '21':'Cardinal Mark E', 584 '22':'Cardinal Mark S', 585 '23':'Cardinal Mark W', 586 '24':'Port hand Mark', 587 '25':'Starbord hand Mark', 588 '26':'Preferred Channel Port hand', 589 '27':'Preferred Channel Starboard hand', 590 '28':'Isolated danger', 591 '29':'Safe water', 592 '30':'Special Mark', 593 '31':'Light Vessel/LANBY', 594 } # typeEncodeLut 595 596 PositionAccuracyEncodeLut = { 597 'low (greater than 10 m)':'0', 598 'high (less than 10 m)':'1', 599 } #PositionAccuracyEncodeLut 600 601 PositionAccuracyDecodeLut = { 602 '0':'low (greater than 10 m)', 603 '1':'high (less than 10 m)', 604 } # PositionAccuracyEncodeLut 605 606 FixTypeEncodeLut = { 607 'Undefined (default)':'0', 608 'GPS':'1', 609 'GLONASS':'2', 610 'Combined GPS/GLONASS':'3', 611 'Loran-C':'4', 612 'Chayka':'5', 613 'Integrated Navigation System':'6', 614 'surveyed':'7', 615 'not used - 8':'8', 616 'not used - 9':'9', 617 'not used - 10':'10', 618 'not used - 11':'11', 619 'not used - 12':'12', 620 'not used - 13':'13', 621 'not used - 14':'14', 622 'not used - 15':'15', 623 } #FixTypeEncodeLut 624 625 FixTypeDecodeLut = { 626 '0':'Undefined (default)', 627 '1':'GPS', 628 '2':'GLONASS', 629 '3':'Combined GPS/GLONASS', 630 '4':'Loran-C', 631 '5':'Chayka', 632 '6':'Integrated Navigation System', 633 '7':'surveyed', 634 '8':'not used - 8', 635 '9':'not used - 9', 636 '10':'not used - 10', 637 '11':'not used - 11', 638 '12':'not used - 12', 639 '13':'not used - 13', 640 '14':'not used - 14', 641 '15':'not used - 15', 642 } # FixTypeEncodeLut 643 644 timestampEncodeLut = { 645 'Positioning system is in manual mode':'61', 646 'Electronic position fixing system operates in estimated mode':'62', 647 'Positioning system is inoperative':'63', 648 } #timestampEncodeLut 649 650 timestampDecodeLut = { 651 '61':'Positioning system is in manual mode', 652 '62':'Electronic position fixing system operates in estimated mode', 653 '63':'Positioning system is inoperative', 654 } # timestampEncodeLut 655 656 OffPositionEncodeLut = { 657 'On position':'False', 658 'Off position':'True', 659 } #OffPositionEncodeLut 660 661 OffPositionDecodeLut = { 662 'False':'On position', 663 'True':'Off position', 664 } # OffPositionEncodeLut 665 666 RAIMEncodeLut = { 667 'not in use':'False', 668 'in use':'True', 669 } #RAIMEncodeLut 670 671 RAIMDecodeLut = { 672 'False':'not in use', 673 'True':'in use', 674 } # RAIMEncodeLut 675 676 ###################################################################### 677 # SQL SUPPORT 678 ###################################################################### 679 680 dbTableName='AidsToNavReport' 681 'Database table name' 682

683 -def sqlCreateStr(outfile=sys.stdout, fields=None, extraFields=None 684 ,addCoastGuardFields=True 685 ,dbType='postgres' 686 ):

687 ''' 688 Return the SQL CREATE command for this message type 689 @param outfile: file like object to print to. 690 @param fields: which fields to put in the create. Defaults to all. 691 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 692 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 693 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 694 @type addCoastGuardFields: bool 695 @return: sql create string 696 @rtype: str 697 698 @see: sqlCreate 699 ''' 700 # FIX: should this sqlCreate be the same as in LaTeX (createFuncName) rather than hard coded? 701 outfile.write(str(sqlCreate(fields,extraFields,addCoastGuardFields,dbType=dbType)))

702

703 -def sqlCreate(fields=None, extraFields=None, addCoastGuardFields=True, dbType='postgres'):

704 ''' 705 Return the sqlhelp object to create the table. 706 707 @param fields: which fields to put in the create. Defaults to all. 708 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 709 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 710 @type addCoastGuardFields: bool 711 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 712 @return: An object that can be used to generate a return 713 @rtype: sqlhelp.create 714 ''' 715 if None == fields: fields = fieldList 716 import sqlhelp 717 c = sqlhelp.create('AidsToNavReport',dbType=dbType) 718 c.addPrimaryKey() 719 if 'MessageID' in fields: c.addInt ('MessageID') 720 if 'RepeatIndicator' in fields: c.addInt ('RepeatIndicator') 721 if 'UserID' in fields: c.addInt ('UserID') 722 if 'type' in fields: c.addInt ('type') 723 if 'name' in fields: c.addVarChar('name',20) 724 if 'PositionAccuracy' in fields: c.addInt ('PositionAccuracy') 725 if dbType != 'postgres': 726 if 'longitude' in fields: c.addDecimal('longitude',8,5) 727 if dbType != 'postgres': 728 if 'latitude' in fields: c.addDecimal('latitude',8,5) 729 if 'dim' in fields: c.addInt ('dim') 730 if 'FixType' in fields: c.addInt ('FixType') 731 if 'timestamp' in fields: c.addInt ('timestamp') 732 if 'OffPosition' in fields: c.addBool('OffPosition') 733 if 'RegionalApp' in fields: c.addInt ('RegionalApp') 734 if 'RAIM' in fields: c.addBool('RAIM') 735 if 'Spare' in fields: c.addInt ('Spare') 736 737 if addCoastGuardFields: 738 # c.addInt('cg_rssi') # Relative signal strength indicator 739 # c.addInt('cg_d') # dBm receive strength 740 # c.addInt('cg_T') # Receive timestamp from the AIS equipment 741 # c.addInt('cg_S') # Slot received in 742 # c.addVarChar('cg_x',10) # Idonno 743 c.addVarChar('cg_r',15) # Receiver station ID - should usually be an MMSI, but sometimes is a string 744 c.addInt('cg_sec') # UTC seconds since the epoch 745 746 c.addTimestamp('cg_timestamp') # UTC decoded cg_sec - not actually in the data stream 747 748 if dbType == 'postgres': 749 #--- EPSG 4326 : WGS 84 750 #INSERT INTO "spatial_ref_sys" ("srid","auth_name","auth_srid","srtext","proj4text") VALUES (4326,'EPSG',4326,'GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]]','+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs '); 751 c.addPostGIS('Position','POINT',2,SRID=4326); 752 753 return c

754

755 -def sqlInsertStr(params, outfile=sys.stdout, extraParams=None, dbType='postgres'):

756 ''' 757 Return the SQL INSERT command for this message type 758 @param params: dictionary of values keyed by field name 759 @param outfile: file like object to print to. 760 @param extraParams: A sequence of tuples containing (name,sql type) for additional fields 761 @return: sql create string 762 @rtype: str 763 764 @see: sqlCreate 765 ''' 766 outfile.write(str(sqlInsert(params,extraParams,dbType=dbType)))

767 768

769 -def sqlInsert(params,extraParams=None,dbType='postgres'):

770 ''' 771 Give the SQL INSERT statement 772 @param params: dict keyed by field name of values 773 @param extraParams: any extra fields that you have created beyond the normal ais message fields 774 @rtype: sqlhelp.insert 775 @return: insert class instance 776 @todo: allow optional type checking of params? 777 @warning: this will take invalid keys happily and do what??? 778 ''' 779 import sqlhelp 780 i = sqlhelp.insert('AidsToNavReport',dbType=dbType) 781 782 if dbType=='postgres': 783 finished = [] 784 for key in params: 785 if key in finished: 786 continue 787 788 if key not in toPgFields and key not in fromPgFields: 789 if type(params[key])==Decimal: i.add(key,float(params[key])) 790 else: i.add(key,params[key]) 791 else: 792 if key in fromPgFields: 793 val = params[key] 794 # Had better be a WKT type like POINT(-88.1 30.321) 795 i.addPostGIS(key,val) 796 finished.append(key) 797 else: 798 # Need to construct the type. 799 pgName = toPgFields[key] 800 #valStr='GeomFromText(\''+pgTypes[pgName]+'(' 801 valStr=pgTypes[pgName]+'(' 802 vals = [] 803 for nonPgKey in fromPgFields[pgName]: 804 vals.append(str(params[nonPgKey])) 805 finished.append(nonPgKey) 806 valStr+=' '.join(vals)+')' 807 i.addPostGIS(pgName,valStr) 808 else: 809 for key in params: 810 if type(params[key])==Decimal: i.add(key,float(params[key])) 811 else: i.add(key,params[key]) 812 813 if None != extraParams: 814 for key in extraParams: 815 i.add(key,extraParams[key]) 816 817 return i

818 819 ###################################################################### 820 # LATEX SUPPORT 821 ###################################################################### 822

823 -def latexDefinitionTable(outfile=sys.stdout 824 ):

825 ''' 826 Return the LaTeX definition table for this message type 827 @param outfile: file like object to print to. 828 @type outfile: file obj 829 @return: LaTeX table string via the outfile 830 @rtype: str 831 832 ''' 833 o = outfile 834 835 o.write(''' 836 \\begin{table}%[htb] 837 \\centering 838 \\begin{tabular}{|l|c|l|} 839 \\hline 840 Parameter & Number of bits & Description 841 \\\\ \\hline\\hline 842 MessageID & 6 & AIS message number. Must be 21 aka 'F' \\\\ \hline 843 RepeatIndicator & 2 & Indicated how many times a message has been repeated \\\\ \hline 844 UserID & 30 & Unique ship identification number (MMSI) \\\\ \hline 845 type & 5 & IALA type of aid-to-navigation \\\\ \hline 846 name & 120 & Name of the aid-to-navigation \\\\ \hline 847 PositionAccuracy & 1 & Accuracy of positioning fixes \\\\ \hline 848 longitude & 28 & Location of the AtoN East West location \\\\ \hline 849 latitude & 27 & Location of the AtoN North South location \\\\ \hline 850 dim & 30 & FIX: break this out. \\\\ \hline 851 FixType & 4 & Type of electronic position fixing device \\\\ \hline 852 timestamp & 6 & UTC second when report was generated \\\\ \hline 853 OffPosition & 1 & True when the AtoN is off station \\\\ \hline 854 RegionalApp & 8 & Should be set to zero \\\\ \hline 855 RAIM & 1 & Receiver autonomous integrity monitoring flag \\\\ \hline 856 Spare & 3 & Not Used\\\\ \\hline \\hline 857 Total bits & 272 & Appears to take 2 slots with 152 pad bits to fill the last slot \\\\ \\hline 858 \\end{tabular} 859 \\caption{AIS message number 21: Used by a station mounted on an aid-to-navigation. Note IALA A-124 P.19 for more bits than are here. Also covered in A-126 in ANNEX 1 - MESSAGE 21 in IALA Recommendation A-126 on the use of AIS in Marine Aids to Navigation Serves Ed 1.1. This has optional extensions. What is the IALA Page 7 that Mueller refered to for the RegioanlApp field?} 860 \\label{tab:AidsToNavReport} 861 \\end{table} 862 ''')

863 864 ###################################################################### 865 # Text Definition 866 ###################################################################### 867

868 -def textDefinitionTable(outfile=sys.stdout 869 ,delim='\t' 870 ):

871 ''' 872 Return the text definition table for this message type 873 @param outfile: file like object to print to. 874 @type outfile: file obj 875 @return: text table string via the outfile 876 @rtype: str 877 878 ''' 879 o = outfile 880 o.write('''Parameter'''+delim+'Number of bits'''+delim+'''Description 881 MessageID'''+delim+'''6'''+delim+'''AIS message number. Must be 21 aka 'F' 882 RepeatIndicator'''+delim+'''2'''+delim+'''Indicated how many times a message has been repeated 883 UserID'''+delim+'''30'''+delim+'''Unique ship identification number (MMSI) 884 type'''+delim+'''5'''+delim+'''IALA type of aid-to-navigation 885 name'''+delim+'''120'''+delim+'''Name of the aid-to-navigation 886 PositionAccuracy'''+delim+'''1'''+delim+'''Accuracy of positioning fixes 887 longitude'''+delim+'''28'''+delim+'''Location of the AtoN East West location 888 latitude'''+delim+'''27'''+delim+'''Location of the AtoN North South location 889 dim'''+delim+'''30'''+delim+'''FIX: break this out. 890 FixType'''+delim+'''4'''+delim+'''Type of electronic position fixing device 891 timestamp'''+delim+'''6'''+delim+'''UTC second when report was generated 892 OffPosition'''+delim+'''1'''+delim+'''True when the AtoN is off station 893 RegionalApp'''+delim+'''8'''+delim+'''Should be set to zero 894 RAIM'''+delim+'''1'''+delim+'''Receiver autonomous integrity monitoring flag 895 Spare'''+delim+'''3'''+delim+'''Not Used 896 Total bits'''+delim+'''272'''+delim+'''Appears to take 2 slots with 152 pad bits to fill the last slot''')

897 898 899 ###################################################################### 900 # UNIT TESTING 901 ###################################################################### 902 import unittest

903 -def testParams():

904 '''Return a params file base on the testvalue tags. 905 @rtype: dict 906 @return: params based on testvalue tags 907 ''' 908 params = {} 909 params['MessageID'] = 21 910 params['RepeatIndicator'] = 1 911 params['UserID'] = 1193046 912 params['type'] = 28 913 params['name'] = 'BUNCH OF ROCKS ATON@' 914 params['PositionAccuracy'] = 1 915 params['longitude'] = Decimal('-122.16328055555556') 916 params['latitude'] = Decimal('37.424458333333334') 917 params['dim'] = 0 918 params['FixType'] = 2 919 params['timestamp'] = 62 920 params['OffPosition'] = False 921 params['RegionalApp'] = 0 922 params['RAIM'] = False 923 params['Spare'] = 0 924 925 return params

926

927 -class TestAidsToNavReport(unittest.TestCase):

928 '''Use testvalue tag text from each type to build test case the AidsToNavReport message'''

929 - def testEncodeDecode(self):

930 931 params = testParams() 932 bits = encode(params) 933 r = decode(bits) 934 935 # Check that each parameter came through ok. 936 self.failUnlessEqual(r['MessageID'],params['MessageID']) 937 self.failUnlessEqual(r['RepeatIndicator'],params['RepeatIndicator']) 938 self.failUnlessEqual(r['UserID'],params['UserID']) 939 self.failUnlessEqual(r['type'],params['type']) 940 self.failUnlessEqual(r['name'],params['name']) 941 self.failUnlessEqual(r['PositionAccuracy'],params['PositionAccuracy']) 942 self.failUnlessAlmostEqual(r['longitude'],params['longitude'],5) 943 self.failUnlessAlmostEqual(r['latitude'],params['latitude'],5) 944 self.failUnlessEqual(r['dim'],params['dim']) 945 self.failUnlessEqual(r['FixType'],params['FixType']) 946 self.failUnlessEqual(r['timestamp'],params['timestamp']) 947 self.failUnlessEqual(r['OffPosition'],params['OffPosition']) 948 self.failUnlessEqual(r['RegionalApp'],params['RegionalApp']) 949 self.failUnlessEqual(r['RAIM'],params['RAIM']) 950 self.failUnlessEqual(r['Spare'],params['Spare'])

951

952 -def addMsgOptions(parser):

953 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 954 help='decode a "AidsToNavReport" AIS message') 955 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 956 help='encode a "AidsToNavReport" AIS message') 957 parser.add_option('--RepeatIndicator-field', dest='RepeatIndicatorField',default=0,metavar='uint',type='int' 958 ,help='Field parameter value [default: %default]') 959 parser.add_option('--UserID-field', dest='UserIDField',metavar='uint',type='int' 960 ,help='Field parameter value [default: %default]') 961 parser.add_option('--type-field', dest='typeField',default=0,metavar='uint',type='int' 962 ,help='Field parameter value [default: %default]') 963 parser.add_option('--name-field', dest='nameField',default='@@@@@@@@@@@@@@@@@@@@',metavar='aisstr6',type='string' 964 ,help='Field parameter value [default: %default]') 965 parser.add_option('--PositionAccuracy-field', dest='PositionAccuracyField',metavar='uint',type='int' 966 ,help='Field parameter value [default: %default]') 967 parser.add_option('--longitude-field', dest='longitudeField',default=Decimal('181'),metavar='decimal',type='string' 968 ,help='Field parameter value [default: %default]') 969 parser.add_option('--latitude-field', dest='latitudeField',default=Decimal('91'),metavar='decimal',type='string' 970 ,help='Field parameter value [default: %default]') 971 parser.add_option('--dim-field', dest='dimField',default=0,metavar='uint',type='int' 972 ,help='Field parameter value [default: %default]') 973 parser.add_option('--FixType-field', dest='FixTypeField',default=0,metavar='uint',type='int' 974 ,help='Field parameter value [default: %default]') 975 parser.add_option('--timestamp-field', dest='timestampField',metavar='uint',type='int' 976 ,help='Field parameter value [default: %default]') 977 parser.add_option('--OffPosition-field', dest='OffPositionField',metavar='bool',type='int' 978 ,help='Field parameter value [default: %default]') 979 parser.add_option('--RAIM-field', dest='RAIMField',metavar='bool',type='int' 980 ,help='Field parameter value [default: %default]')

981 982 ############################################################ 983 if __name__=='__main__': 984 985 from optparse import OptionParser 986 parser = OptionParser(usage="%prog [options]", 987 version="%prog "+__version__) 988 989 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 990 help='run the documentation tests') 991 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 992 help='run the unit tests') 993 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 994 help='Make the test output verbose') 995 996 # FIX: remove nmea from binary messages. No way to build the whole packet? 997 # FIX: or build the surrounding msg 8 for a broadcast? 998 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 999 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 1000 ,default='nmeapayload' 1001 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 1002 1003 1004 outputChoices = ('std','html','csv','sql' , 'kml','kml-full') 1005 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 1006 ,default='std' 1007 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 1008 1009 parser.add_option('-o','--output',dest='outputFileName',default=None, 1010 help='Name of the python file to write [default: stdout]') 1011 1012 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 1013 choices=fieldList, 1014 help='Which fields to include in the output. Currently only for csv output [default: all]') 1015 1016 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 1017 help='Print the field name for csv') 1018 1019 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 1020 help='Print out an sql create command for the table.') 1021 1022 parser.add_option('--latex-table',dest='latexDefinitionTable',default=False,action='store_true', 1023 help='Print a LaTeX table of the type') 1024 1025 parser.add_option('--text-table',dest='textDefinitionTable',default=False,action='store_true', 1026 help='Print delimited table of the type (for Word table importing)') 1027 parser.add_option('--delimt-text-table',dest='delimTextDefinitionTable',default='\t' 1028 ,help='Delimiter for text table [default: \'%default\'](for Word table importing)') 1029 1030 1031 dbChoices = ('sqlite','postgres') 1032 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 1033 ,choices=dbChoices,type='choice' 1034 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 1035 1036 addMsgOptions(parser) 1037 1038 (options,args) = parser.parse_args() 1039 success=True 1040 1041 if options.doctest: 1042 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 1043 sys.argv= [sys.argv[0]] 1044 if options.verbose: sys.argv.append('-v') 1045 import doctest 1046 numfail,numtests=doctest.testmod() 1047 if numfail==0: print 'ok' 1048 else: 1049 print 'FAILED' 1050 success=False 1051 1052 if not success: sys.exit('Something Failed') 1053 del success # Hide success from epydoc 1054 1055 if options.unittest: 1056 sys.argv = [sys.argv[0]] 1057 if options.verbose: sys.argv.append('-v') 1058 unittest.main() 1059 1060 outfile = sys.stdout 1061 if None!=options.outputFileName: 1062 outfile = file(options.outputFileName,'w') 1063 1064 1065 if options.doEncode: 1066 # First make sure all non required options are specified 1067 if None==options.RepeatIndicatorField: parser.error("missing value for RepeatIndicatorField") 1068 if None==options.UserIDField: parser.error("missing value for UserIDField") 1069 if None==options.typeField: parser.error("missing value for typeField") 1070 if None==options.nameField: parser.error("missing value for nameField") 1071 if None==options.PositionAccuracyField: parser.error("missing value for PositionAccuracyField") 1072 if None==options.longitudeField: parser.error("missing value for longitudeField") 1073 if None==options.latitudeField: parser.error("missing value for latitudeField") 1074 if None==options.dimField: parser.error("missing value for dimField") 1075 if None==options.FixTypeField: parser.error("missing value for FixTypeField") 1076 if None==options.timestampField: parser.error("missing value for timestampField") 1077 if None==options.OffPositionField: parser.error("missing value for OffPositionField") 1078 if None==options.RAIMField: parser.error("missing value for RAIMField") 1079 msgDict={ 1080 'MessageID': '21', 1081 'RepeatIndicator': options.RepeatIndicatorField, 1082 'UserID': options.UserIDField, 1083 'type': options.typeField, 1084 'name': options.nameField, 1085 'PositionAccuracy': options.PositionAccuracyField, 1086 'longitude': options.longitudeField, 1087 'latitude': options.latitudeField, 1088 'dim': options.dimField, 1089 'FixType': options.FixTypeField, 1090 'timestamp': options.timestampField, 1091 'OffPosition': options.OffPositionField, 1092 'RegionalApp': '0', 1093 'RAIM': options.RAIMField, 1094 'Spare': '0', 1095 } 1096 1097 bits = encode(msgDict) 1098 if 'binary'==options.ioType: print str(bits) 1099 elif 'nmeapayload'==options.ioType: 1100 # FIX: figure out if this might be necessary at compile time 1101 print "bitLen",len(bits) 1102 bitLen=len(bits) 1103 if bitLen%6!=0: 1104 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 1105 print "result:",binary.bitvectoais6(bits)[0] 1106 1107 1108 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 1109 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 1110 else: sys.exit('ERROR: unknown ioType. Help!') 1111 1112 1113 if options.sqlCreate: 1114 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 1115 1116 if options.latexDefinitionTable: 1117 latexDefinitionTable(outfile) 1118 1119 # For conversion to word tables 1120 if options.textDefinitionTable: 1121 textDefinitionTable(outfile,options.delimTextDefinitionTable) 1122 1123 if options.printCsvfieldList: 1124 # Make a csv separated list of fields that will be displayed for csv 1125 if None == options.fieldList: options.fieldList = fieldList 1126 import StringIO 1127 buf = StringIO.StringIO() 1128 for field in options.fieldList: 1129 buf.write(field+',') 1130 result = buf.getvalue() 1131 if result[-1] == ',': print result[:-1] 1132 else: print result 1133 1134 if options.doDecode: 1135 if len(args)==0: args = sys.stdin 1136 for msg in args: 1137 bv = None 1138 1139 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 1140 # Found nmea 1141 # FIX: do checksum 1142 bv = binary.ais6tobitvec(msg.split(',')[5]) 1143 else: # either binary or nmeapayload... expect mostly nmeapayloads 1144 # assumes that an all 0 and 1 string can not be a nmeapayload 1145 binaryMsg=True 1146 for c in msg: 1147 if c not in ('0','1'): 1148 binaryMsg=False 1149 break 1150 if binaryMsg: 1151 bv = BitVector(bitstring=msg) 1152 else: # nmeapayload 1153 bv = binary.ais6tobitvec(msg) 1154 1155 printFields(decode(bv) 1156 ,out=outfile 1157 ,format=options.outputType 1158 ,fieldList=options.fieldList 1159 ,dbType=options.dbType 1160 ) 1161

Source Code for Module ais.ais_msg_21