Package ais :: Module ais_msg_1
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Source Code for Module ais.ais_msg_1

   1  #!/usr/bin/env python 
   2   
   3  __version__ = '$Revision: 4791 $'.split()[1] 
   4  __date__ = '$Date: 2007-02-26 $'.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          'NavigationStatus', 
  54          'ROT', 
  55          'SOG', 
  56          'PositionAccuracy', 
  57          'Position_longitude', 
  58          'Position_latitude', 
  59          'COG', 
  60          'TrueHeading', 
  61          'TimeStamp', 
  62          'RegionalReserved', 
  63          'Spare', 
  64          'RAIM', 
  65          'state_syncstate', 
  66          'state_slottimeout', 
  67          'state_slotoffset', 
  68  ) 
  69   
  70  fieldListPostgres = ( 
  71          'MessageID', 
  72          'RepeatIndicator', 
  73          'UserID', 
  74          'NavigationStatus', 
  75          'ROT', 
  76          'SOG', 
  77          'PositionAccuracy', 
  78          'Position',     # PostGIS data type 
  79          'COG', 
  80          'TrueHeading', 
  81          'TimeStamp', 
  82          'RegionalReserved', 
  83          'Spare', 
  84          'RAIM', 
  85          'state_syncstate', 
  86          'state_slottimeout', 
  87          'state_slotoffset', 
  88  ) 
  89   
  90  toPgFields = { 
  91          'Position_longitude':'Position', 
  92          'Position_latitude':'Position', 
  93  } 
  94  ''' 
  95  Go to the Postgis field names from the straight field name 
  96  ''' 
  97   
  98  fromPgFields = { 
  99          'Position':('Position_longitude','Position_latitude',), 
 100  } 
 101  ''' 
 102  Go from the Postgis field names to the straight field name 
 103  ''' 
 104   
 105  pgTypes = { 
 106          'Position':'POINT', 
 107  } 
 108  ''' 
 109  Lookup table for each postgis field name to get its type. 
 110  ''' 
 111   
112 -def encode(params, validate=False):
113 '''Create a position binary message payload to pack into an AIS Msg position. 114 115 Fields in params: 116 - MessageID(uint): AIS message number. Must be 1 (field automatically set to "1") 117 - RepeatIndicator(uint): Indicated how many times a message has been repeated 118 - UserID(uint): Unique ship identification number (MMSI) 119 - NavigationStatus(uint): What is the vessel doing 120 - ROT(int): RateOfTurn 121 - SOG(udecimal): Speed over ground 122 - PositionAccuracy(uint): Accuracy of positioning fixes 123 - Position_longitude(decimal): Location of the vessel East West location 124 - Position_latitude(decimal): Location of the vessel North South location 125 - COG(udecimal): Course over ground 126 - TrueHeading(uint): True heading (relative to true North) 127 - TimeStamp(uint): UTC second when the report was generated 128 - RegionalReserved(uint): Reserved for definition by a regional authority. (field automatically set to "0") 129 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 130 - RAIM(bool): Receiver autonomous integrity monitoring flag 131 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 132 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 133 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 134 @param params: Dictionary of field names/values. Throws a ValueError exception if required is missing 135 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 136 @rtype: BitVector 137 @return: encoded binary message (for binary messages, this needs to be wrapped in a msg 8 138 @note: The returned bits may not be 6 bit aligned. It is up to you to pad out the bits. 139 ''' 140 141 bvList = [] 142 bvList.append(binary.setBitVectorSize(BitVector(intVal=1),6)) 143 if 'RepeatIndicator' in params: 144 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['RepeatIndicator']),2)) 145 else: 146 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),2)) 147 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['UserID']),30)) 148 if 'NavigationStatus' in params: 149 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['NavigationStatus']),4)) 150 else: 151 bvList.append(binary.setBitVectorSize(BitVector(intVal=15),4)) 152 if 'ROT' in params: 153 bvList.append(binary.bvFromSignedInt(params['ROT'],8)) 154 else: 155 bvList.append(binary.bvFromSignedInt(-128,8)) 156 if 'SOG' in params: 157 bvList.append(binary.setBitVectorSize(BitVector(intVal=int((Decimal(params['SOG'])*Decimal('10')))),10)) 158 else: 159 bvList.append(binary.setBitVectorSize(BitVector(intVal=int(1023)),10)) 160 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['PositionAccuracy']),1)) 161 if 'Position_longitude' in params: 162 bvList.append(binary.bvFromSignedInt(int(Decimal(params['Position_longitude'])*Decimal('600000')),28)) 163 else: 164 bvList.append(binary.bvFromSignedInt(108600000,28)) 165 if 'Position_latitude' in params: 166 bvList.append(binary.bvFromSignedInt(int(Decimal(params['Position_latitude'])*Decimal('600000')),27)) 167 else: 168 bvList.append(binary.bvFromSignedInt(54600000,27)) 169 if 'COG' in params: 170 bvList.append(binary.setBitVectorSize(BitVector(intVal=int((Decimal(params['COG'])*Decimal('10')))),12)) 171 else: 172 bvList.append(binary.setBitVectorSize(BitVector(intVal=int(3600)),12)) 173 if 'TrueHeading' in params: 174 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['TrueHeading']),9)) 175 else: 176 bvList.append(binary.setBitVectorSize(BitVector(intVal=511),9)) 177 if 'TimeStamp' in params: 178 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['TimeStamp']),6)) 179 else: 180 bvList.append(binary.setBitVectorSize(BitVector(intVal=60),6)) 181 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),4)) 182 bvList.append(binary.setBitVectorSize(BitVector(intVal=0),1)) 183 if params["RAIM"]: bvList.append(TrueBV) 184 else: bvList.append(FalseBV) 185 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_syncstate']),2)) 186 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_slottimeout']),3)) 187 bvList.append(binary.setBitVectorSize(BitVector(intVal=params['state_slotoffset']),14)) 188 189 return binary.joinBV(bvList)
190
191 -def decode(bv, validate=False):
192 '''Unpack a position message 193 194 Fields in params: 195 - MessageID(uint): AIS message number. Must be 1 (field automatically set to "1") 196 - RepeatIndicator(uint): Indicated how many times a message has been repeated 197 - UserID(uint): Unique ship identification number (MMSI) 198 - NavigationStatus(uint): What is the vessel doing 199 - ROT(int): RateOfTurn 200 - SOG(udecimal): Speed over ground 201 - PositionAccuracy(uint): Accuracy of positioning fixes 202 - Position_longitude(decimal): Location of the vessel East West location 203 - Position_latitude(decimal): Location of the vessel North South location 204 - COG(udecimal): Course over ground 205 - TrueHeading(uint): True heading (relative to true North) 206 - TimeStamp(uint): UTC second when the report was generated 207 - RegionalReserved(uint): Reserved for definition by a regional authority. (field automatically set to "0") 208 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 209 - RAIM(bool): Receiver autonomous integrity monitoring flag 210 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 211 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 212 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 213 @type bv: BitVector 214 @param bv: Bits defining a message 215 @param validate: Set to true to cause checking to occur. Runs slower. FIX: not implemented. 216 @rtype: dict 217 @return: params 218 ''' 219 220 #Would be nice to check the bit count here.. 221 #if validate: 222 # assert (len(bv)==FIX: SOME NUMBER) 223 r = {} 224 r['MessageID']=1 225 r['RepeatIndicator']=int(bv[6:8]) 226 r['UserID']=int(bv[8:38]) 227 r['NavigationStatus']=int(bv[38:42]) 228 r['ROT']=binary.signedIntFromBV(bv[42:50]) 229 r['SOG']=Decimal(int(bv[50:60]))/Decimal('10') 230 r['PositionAccuracy']=int(bv[60:61]) 231 r['Position_longitude']=Decimal(binary.signedIntFromBV(bv[61:89]))/Decimal('600000') 232 r['Position_latitude']=Decimal(binary.signedIntFromBV(bv[89:116]))/Decimal('600000') 233 r['COG']=Decimal(int(bv[116:128]))/Decimal('10') 234 r['TrueHeading']=int(bv[128:137]) 235 r['TimeStamp']=int(bv[137:143]) 236 r['RegionalReserved']=0 237 r['Spare']=0 238 r['RAIM']=bool(int(bv[148:149])) 239 r['state_syncstate']=int(bv[149:151]) 240 r['state_slottimeout']=int(bv[151:154]) 241 r['state_slotoffset']=int(bv[154:168]) 242 return r
243
244 -def decodeMessageID(bv, validate=False):
245 return 1
246
247 -def decodeRepeatIndicator(bv, validate=False):
248 return int(bv[6:8])
249
250 -def decodeUserID(bv, validate=False):
251 return int(bv[8:38])
252
253 -def decodeNavigationStatus(bv, validate=False):
254 return int(bv[38:42])
255
256 -def decodeROT(bv, validate=False):
257 return binary.signedIntFromBV(bv[42:50])
258
259 -def decodeSOG(bv, validate=False):
260 return Decimal(int(bv[50:60]))/Decimal('10')
261
262 -def decodePositionAccuracy(bv, validate=False):
263 return int(bv[60:61])
264
265 -def decodePosition_longitude(bv, validate=False):
266 return Decimal(binary.signedIntFromBV(bv[61:89]))/Decimal('600000')
267
268 -def decodePosition_latitude(bv, validate=False):
269 return Decimal(binary.signedIntFromBV(bv[89:116]))/Decimal('600000')
270
271 -def decodeCOG(bv, validate=False):
272 return Decimal(int(bv[116:128]))/Decimal('10')
273
274 -def decodeTrueHeading(bv, validate=False):
275 return int(bv[128:137])
276
277 -def decodeTimeStamp(bv, validate=False):
278 return int(bv[137:143])
279
280 -def decodeRegionalReserved(bv, validate=False):
281 return 0
282
283 -def decodeSpare(bv, validate=False):
284 return 0
285
286 -def decodeRAIM(bv, validate=False):
287 return bool(int(bv[148:149]))
288
289 -def decodestate_syncstate(bv, validate=False):
290 return int(bv[149:151])
291
292 -def decodestate_slottimeout(bv, validate=False):
293 return int(bv[151:154])
294
295 -def decodestate_slotoffset(bv, validate=False):
296 return int(bv[154:168])
297 298
299 -def printHtml(params, out=sys.stdout):
300 out.write("<h3>position<h3>\n") 301 out.write("<table border=\"1\">\n") 302 out.write("<tr bgcolor=\"orange\">\n") 303 out.write("<th align=\"left\">Field Name</th>\n") 304 out.write("<th align=\"left\">Type</th>\n") 305 out.write("<th align=\"left\">Value</th>\n") 306 out.write("<th align=\"left\">Value in Lookup Table</th>\n") 307 out.write("<th align=\"left\">Units</th>\n") 308 out.write("\n") 309 out.write("<tr>\n") 310 out.write("<td>MessageID</td>\n") 311 out.write("<td>uint</td>\n") 312 if 'MessageID' in params: 313 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 314 out.write(" <td>"+str(params['MessageID'])+"</td>\n") 315 out.write("</tr>\n") 316 out.write("\n") 317 out.write("<tr>\n") 318 out.write("<td>RepeatIndicator</td>\n") 319 out.write("<td>uint</td>\n") 320 if 'RepeatIndicator' in params: 321 out.write(" <td>"+str(params['RepeatIndicator'])+"</td>\n") 322 if str(params['RepeatIndicator']) in RepeatIndicatorDecodeLut: 323 out.write("<td>"+RepeatIndicatorDecodeLut[str(params['RepeatIndicator'])]+"</td>") 324 else: 325 out.write("<td><i>Missing LUT entry</i></td>") 326 out.write("</tr>\n") 327 out.write("\n") 328 out.write("<tr>\n") 329 out.write("<td>UserID</td>\n") 330 out.write("<td>uint</td>\n") 331 if 'UserID' in params: 332 out.write(" <td>"+str(params['UserID'])+"</td>\n") 333 out.write(" <td>"+str(params['UserID'])+"</td>\n") 334 out.write("</tr>\n") 335 out.write("\n") 336 out.write("<tr>\n") 337 out.write("<td>NavigationStatus</td>\n") 338 out.write("<td>uint</td>\n") 339 if 'NavigationStatus' in params: 340 out.write(" <td>"+str(params['NavigationStatus'])+"</td>\n") 341 if str(params['NavigationStatus']) in NavigationStatusDecodeLut: 342 out.write("<td>"+NavigationStatusDecodeLut[str(params['NavigationStatus'])]+"</td>") 343 else: 344 out.write("<td><i>Missing LUT entry</i></td>") 345 out.write("</tr>\n") 346 out.write("\n") 347 out.write("<tr>\n") 348 out.write("<td>ROT</td>\n") 349 out.write("<td>int</td>\n") 350 if 'ROT' in params: 351 out.write(" <td>"+str(params['ROT'])+"</td>\n") 352 out.write(" <td>"+str(params['ROT'])+"</td>\n") 353 out.write("<td>4.733*sqrt(val) degrees/min</td>\n") 354 out.write("</tr>\n") 355 out.write("\n") 356 out.write("<tr>\n") 357 out.write("<td>SOG</td>\n") 358 out.write("<td>udecimal</td>\n") 359 if 'SOG' in params: 360 out.write(" <td>"+str(params['SOG'])+"</td>\n") 361 if str(params['SOG']) in SOGDecodeLut: 362 out.write("<td>"+SOGDecodeLut[str(params['SOG'])]+"</td>") 363 else: 364 out.write("<td><i>Missing LUT entry</i></td>") 365 out.write("<td>knots</td>\n") 366 out.write("</tr>\n") 367 out.write("\n") 368 out.write("<tr>\n") 369 out.write("<td>PositionAccuracy</td>\n") 370 out.write("<td>uint</td>\n") 371 if 'PositionAccuracy' in params: 372 out.write(" <td>"+str(params['PositionAccuracy'])+"</td>\n") 373 if str(params['PositionAccuracy']) in PositionAccuracyDecodeLut: 374 out.write("<td>"+PositionAccuracyDecodeLut[str(params['PositionAccuracy'])]+"</td>") 375 else: 376 out.write("<td><i>Missing LUT entry</i></td>") 377 out.write("</tr>\n") 378 out.write("\n") 379 out.write("<tr>\n") 380 out.write("<td>Position_longitude</td>\n") 381 out.write("<td>decimal</td>\n") 382 if 'Position_longitude' in params: 383 out.write(" <td>"+str(params['Position_longitude'])+"</td>\n") 384 out.write(" <td>"+str(params['Position_longitude'])+"</td>\n") 385 out.write("<td>degrees</td>\n") 386 out.write("</tr>\n") 387 out.write("\n") 388 out.write("<tr>\n") 389 out.write("<td>Position_latitude</td>\n") 390 out.write("<td>decimal</td>\n") 391 if 'Position_latitude' in params: 392 out.write(" <td>"+str(params['Position_latitude'])+"</td>\n") 393 out.write(" <td>"+str(params['Position_latitude'])+"</td>\n") 394 out.write("<td>degrees</td>\n") 395 out.write("</tr>\n") 396 out.write("\n") 397 out.write("<tr>\n") 398 out.write("<td>COG</td>\n") 399 out.write("<td>udecimal</td>\n") 400 if 'COG' in params: 401 out.write(" <td>"+str(params['COG'])+"</td>\n") 402 out.write(" <td>"+str(params['COG'])+"</td>\n") 403 out.write("<td>degrees</td>\n") 404 out.write("</tr>\n") 405 out.write("\n") 406 out.write("<tr>\n") 407 out.write("<td>TrueHeading</td>\n") 408 out.write("<td>uint</td>\n") 409 if 'TrueHeading' in params: 410 out.write(" <td>"+str(params['TrueHeading'])+"</td>\n") 411 out.write(" <td>"+str(params['TrueHeading'])+"</td>\n") 412 out.write("<td>degrees</td>\n") 413 out.write("</tr>\n") 414 out.write("\n") 415 out.write("<tr>\n") 416 out.write("<td>TimeStamp</td>\n") 417 out.write("<td>uint</td>\n") 418 if 'TimeStamp' in params: 419 out.write(" <td>"+str(params['TimeStamp'])+"</td>\n") 420 if str(params['TimeStamp']) in TimeStampDecodeLut: 421 out.write("<td>"+TimeStampDecodeLut[str(params['TimeStamp'])]+"</td>") 422 else: 423 out.write("<td><i>Missing LUT entry</i></td>") 424 out.write("<td>seconds</td>\n") 425 out.write("</tr>\n") 426 out.write("\n") 427 out.write("<tr>\n") 428 out.write("<td>RegionalReserved</td>\n") 429 out.write("<td>uint</td>\n") 430 if 'RegionalReserved' in params: 431 out.write(" <td>"+str(params['RegionalReserved'])+"</td>\n") 432 out.write(" <td>"+str(params['RegionalReserved'])+"</td>\n") 433 out.write("</tr>\n") 434 out.write("\n") 435 out.write("<tr>\n") 436 out.write("<td>Spare</td>\n") 437 out.write("<td>uint</td>\n") 438 if 'Spare' in params: 439 out.write(" <td>"+str(params['Spare'])+"</td>\n") 440 out.write(" <td>"+str(params['Spare'])+"</td>\n") 441 out.write("</tr>\n") 442 out.write("\n") 443 out.write("<tr>\n") 444 out.write("<td>RAIM</td>\n") 445 out.write("<td>bool</td>\n") 446 if 'RAIM' in params: 447 out.write(" <td>"+str(params['RAIM'])+"</td>\n") 448 if str(params['RAIM']) in RAIMDecodeLut: 449 out.write("<td>"+RAIMDecodeLut[str(params['RAIM'])]+"</td>") 450 else: 451 out.write("<td><i>Missing LUT entry</i></td>") 452 out.write("</tr>\n") 453 out.write("\n") 454 out.write("<tr>\n") 455 out.write("<td>state_syncstate</td>\n") 456 out.write("<td>uint</td>\n") 457 if 'state_syncstate' in params: 458 out.write(" <td>"+str(params['state_syncstate'])+"</td>\n") 459 if str(params['state_syncstate']) in state_syncstateDecodeLut: 460 out.write("<td>"+state_syncstateDecodeLut[str(params['state_syncstate'])]+"</td>") 461 else: 462 out.write("<td><i>Missing LUT entry</i></td>") 463 out.write("</tr>\n") 464 out.write("\n") 465 out.write("<tr>\n") 466 out.write("<td>state_slottimeout</td>\n") 467 out.write("<td>uint</td>\n") 468 if 'state_slottimeout' in params: 469 out.write(" <td>"+str(params['state_slottimeout'])+"</td>\n") 470 if str(params['state_slottimeout']) in state_slottimeoutDecodeLut: 471 out.write("<td>"+state_slottimeoutDecodeLut[str(params['state_slottimeout'])]+"</td>") 472 else: 473 out.write("<td><i>Missing LUT entry</i></td>") 474 out.write("<td>frames</td>\n") 475 out.write("</tr>\n") 476 out.write("\n") 477 out.write("<tr>\n") 478 out.write("<td>state_slotoffset</td>\n") 479 out.write("<td>uint</td>\n") 480 if 'state_slotoffset' in params: 481 out.write(" <td>"+str(params['state_slotoffset'])+"</td>\n") 482 out.write(" <td>"+str(params['state_slotoffset'])+"</td>\n") 483 out.write("</tr>\n") 484 out.write("</table>\n")
485 486
487 -def printKml(params, out=sys.stdout):
488 '''KML (Keyhole Markup Language) for Google Earth, but without the header/footer''' 489 out.write("\ <Placemark>\n") 490 out.write("\t <name>"+str(params['UserID'])+"</name>\n") 491 out.write("\t\t<description>\n") 492 import StringIO 493 buf = StringIO.StringIO() 494 printHtml(params,buf) 495 import cgi 496 out.write(cgi.escape(buf.getvalue())) 497 out.write("\t\t</description>\n") 498 out.write("\t\t<styleUrl>#m_ylw-pushpin_copy0</styleUrl>\n") 499 out.write("\t\t<Point>\n") 500 out.write("\t\t\t<coordinates>") 501 out.write(str(params['Position_longitude'])) 502 out.write(',') 503 out.write(str(params['Position_latitude'])) 504 out.write(",0</coordinates>\n") 505 out.write("\t\t</Point>\n") 506 out.write("\t</Placemark>\n")
507
508 -def printFields(params, out=sys.stdout, format='std', fieldList=None, dbType='postgres'):
509 '''Print a position message to stdout. 510 511 Fields in params: 512 - MessageID(uint): AIS message number. Must be 1 (field automatically set to "1") 513 - RepeatIndicator(uint): Indicated how many times a message has been repeated 514 - UserID(uint): Unique ship identification number (MMSI) 515 - NavigationStatus(uint): What is the vessel doing 516 - ROT(int): RateOfTurn 517 - SOG(udecimal): Speed over ground 518 - PositionAccuracy(uint): Accuracy of positioning fixes 519 - Position_longitude(decimal): Location of the vessel East West location 520 - Position_latitude(decimal): Location of the vessel North South location 521 - COG(udecimal): Course over ground 522 - TrueHeading(uint): True heading (relative to true North) 523 - TimeStamp(uint): UTC second when the report was generated 524 - RegionalReserved(uint): Reserved for definition by a regional authority. (field automatically set to "0") 525 - Spare(uint): Not used. Should be set to zero. (field automatically set to "0") 526 - RAIM(bool): Receiver autonomous integrity monitoring flag 527 - state_syncstate(uint): Communications State - SOTDMA Sycronization state 528 - state_slottimeout(uint): Communications State - SOTDMA Frames remaining until a new slot is selected 529 - state_slotoffset(uint): Communications State - SOTDMA In what slot will the next transmission occur. BROKEN 530 @param params: Dictionary of field names/values. 531 @param out: File like object to write to 532 @rtype: stdout 533 @return: text to out 534 ''' 535 536 if 'std'==format: 537 out.write("position:\n") 538 if 'MessageID' in params: out.write(" MessageID: "+str(params['MessageID'])+"\n") 539 if 'RepeatIndicator' in params: out.write(" RepeatIndicator: "+str(params['RepeatIndicator'])+"\n") 540 if 'UserID' in params: out.write(" UserID: "+str(params['UserID'])+"\n") 541 if 'NavigationStatus' in params: out.write(" NavigationStatus: "+str(params['NavigationStatus'])+"\n") 542 if 'ROT' in params: out.write(" ROT: "+str(params['ROT'])+"\n") 543 if 'SOG' in params: out.write(" SOG: "+str(params['SOG'])+"\n") 544 if 'PositionAccuracy' in params: out.write(" PositionAccuracy: "+str(params['PositionAccuracy'])+"\n") 545 if 'Position_longitude' in params: out.write(" Position_longitude: "+str(params['Position_longitude'])+"\n") 546 if 'Position_latitude' in params: out.write(" Position_latitude: "+str(params['Position_latitude'])+"\n") 547 if 'COG' in params: out.write(" COG: "+str(params['COG'])+"\n") 548 if 'TrueHeading' in params: out.write(" TrueHeading: "+str(params['TrueHeading'])+"\n") 549 if 'TimeStamp' in params: out.write(" TimeStamp: "+str(params['TimeStamp'])+"\n") 550 if 'RegionalReserved' in params: out.write(" RegionalReserved: "+str(params['RegionalReserved'])+"\n") 551 if 'Spare' in params: out.write(" Spare: "+str(params['Spare'])+"\n") 552 if 'RAIM' in params: out.write(" RAIM: "+str(params['RAIM'])+"\n") 553 if 'state_syncstate' in params: out.write(" state_syncstate: "+str(params['state_syncstate'])+"\n") 554 if 'state_slottimeout' in params: out.write(" state_slottimeout: "+str(params['state_slottimeout'])+"\n") 555 if 'state_slotoffset' in params: out.write(" state_slotoffset: "+str(params['state_slotoffset'])+"\n") 556 elif 'csv'==format: 557 if None == options.fieldList: 558 options.fieldList = fieldList 559 needComma = False; 560 for field in fieldList: 561 if needComma: out.write(',') 562 needComma = True 563 if field in params: 564 out.write(str(params[field])) 565 # else: leave it empty 566 out.write("\n") 567 elif 'html'==format: 568 printHtml(params,out) 569 elif 'sql'==format: 570 sqlInsertStr(params,out,dbType=dbType) 571 elif 'kml'==format: 572 printKml(params,out) 573 elif 'kml-full'==format: 574 out.write("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n") 575 out.write("<kml xmlns=\"http://earth.google.com/kml/2.1\">\n") 576 out.write("<Document>\n") 577 out.write(" <name>position</name>\n") 578 printKml(params,out) 579 out.write("</Document>\n") 580 out.write("</kml>\n") 581 else: 582 print "ERROR: unknown format:",format 583 assert False 584 585 return # Nothing to return
586 587 RepeatIndicatorEncodeLut = { 588 'default':'0', 589 'do not repeat any more':'3', 590 } #RepeatIndicatorEncodeLut 591 592 RepeatIndicatorDecodeLut = { 593 '0':'default', 594 '3':'do not repeat any more', 595 } # RepeatIndicatorEncodeLut 596 597 NavigationStatusEncodeLut = { 598 'under way using engine':'0', 599 'at anchor':'1', 600 'not under command':'2', 601 'restricted maneuverability':'3', 602 'constrained by her draught':'4', 603 'moored':'5', 604 'aground':'6', 605 'engaged in fishing':'7', 606 'under way sailing':'8', 607 'reserved for future use (hazmat)':'9', 608 'reserved for future use':'10', 609 'reserved for future use':'11', 610 'reserved for future use':'12', 611 'reserved for future use':'13', 612 'reserved for future use':'14', 613 'not defined = default':'15', 614 } #NavigationStatusEncodeLut 615 616 NavigationStatusDecodeLut = { 617 '0':'under way using engine', 618 '1':'at anchor', 619 '2':'not under command', 620 '3':'restricted maneuverability', 621 '4':'constrained by her draught', 622 '5':'moored', 623 '6':'aground', 624 '7':'engaged in fishing', 625 '8':'under way sailing', 626 '9':'reserved for future use (hazmat)', 627 '10':'reserved for future use', 628 '11':'reserved for future use', 629 '12':'reserved for future use', 630 '13':'reserved for future use', 631 '14':'reserved for future use', 632 '15':'not defined = default', 633 } # NavigationStatusEncodeLut 634 635 SOGEncodeLut = { 636 '102.2 knots or higher':'102.2', 637 } #SOGEncodeLut 638 639 SOGDecodeLut = { 640 '102.2':'102.2 knots or higher', 641 } # SOGEncodeLut 642 643 PositionAccuracyEncodeLut = { 644 'low (greater than 10 m)':'0', 645 'high (less than 10 m)':'1', 646 } #PositionAccuracyEncodeLut 647 648 PositionAccuracyDecodeLut = { 649 '0':'low (greater than 10 m)', 650 '1':'high (less than 10 m)', 651 } # PositionAccuracyEncodeLut 652 653 TimeStampEncodeLut = { 654 'not available/default':'60', 655 'manual input':'61', 656 'dead reckoning':'62', 657 'inoperative':'63', 658 } #TimeStampEncodeLut 659 660 TimeStampDecodeLut = { 661 '60':'not available/default', 662 '61':'manual input', 663 '62':'dead reckoning', 664 '63':'inoperative', 665 } # TimeStampEncodeLut 666 667 RAIMEncodeLut = { 668 'not in use':'False', 669 'in use':'True', 670 } #RAIMEncodeLut 671 672 RAIMDecodeLut = { 673 'False':'not in use', 674 'True':'in use', 675 } # RAIMEncodeLut 676 677 state_syncstateEncodeLut = { 678 'UTC direct':'0', 679 'UTC indirect':'1', 680 'synchronized to a base station':'2', 681 'synchronized to another station':'3', 682 } #state_syncstateEncodeLut 683 684 state_syncstateDecodeLut = { 685 '0':'UTC direct', 686 '1':'UTC indirect', 687 '2':'synchronized to a base station', 688 '3':'synchronized to another station', 689 } # state_syncstateEncodeLut 690 691 state_slottimeoutEncodeLut = { 692 'Last frame in this slot':'0', 693 '1 frames left':'1', 694 '2 frames left':'2', 695 '3 frames left':'3', 696 '4 frames left':'4', 697 '5 frames left':'5', 698 '6 frames left':'6', 699 '7 frames left':'7', 700 } #state_slottimeoutEncodeLut 701 702 state_slottimeoutDecodeLut = { 703 '0':'Last frame in this slot', 704 '1':'1 frames left', 705 '2':'2 frames left', 706 '3':'3 frames left', 707 '4':'4 frames left', 708 '5':'5 frames left', 709 '6':'6 frames left', 710 '7':'7 frames left', 711 } # state_slottimeoutEncodeLut 712 713 ###################################################################### 714 # SQL SUPPORT 715 ###################################################################### 716
717 -def sqlCreateStr(outfile=sys.stdout, fields=None, extraFields=None 718 ,addCoastGuardFields=True 719 ,dbType='postgres' 720 ):
721 ''' 722 Return the SQL CREATE command for this message type 723 @param outfile: file like object to print to. 724 @param fields: which fields to put in the create. Defaults to all. 725 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 726 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 727 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 728 @type addCoastGuardFields: bool 729 @return: sql create string 730 @rtype: str 731 732 @see: sqlCreate 733 ''' 734 outfile.write(str(sqlCreate(fields,extraFields,addCoastGuardFields,dbType=dbType)))
735
736 -def sqlCreate(fields=None, extraFields=None, addCoastGuardFields=True, dbType='postgres'):
737 ''' 738 Return the sqlhelp object to create the table. 739 740 @param fields: which fields to put in the create. Defaults to all. 741 @param extraFields: A sequence of tuples containing (name,sql type) for additional fields 742 @param addCoastGuardFields: Add the extra fields that come after the NMEA check some from the USCG N-AIS format 743 @type addCoastGuardFields: bool 744 @param dbType: Which flavor of database we are using so that the create is tailored ('sqlite' or 'postgres') 745 @return: An object that can be used to generate a return 746 @rtype: sqlhelp.create 747 ''' 748 if None == fields: fields = fieldList 749 import sqlhelp 750 c = sqlhelp.create('position',dbType=dbType) 751 c.addPrimaryKey() 752 if 'MessageID' in fields: c.addInt ('MessageID') 753 if 'RepeatIndicator' in fields: c.addInt ('RepeatIndicator') 754 if 'UserID' in fields: c.addInt ('UserID') 755 if 'NavigationStatus' in fields: c.addInt ('NavigationStatus') 756 if 'ROT' in fields: c.addInt ('ROT') 757 if 'SOG' in fields: c.addDecimal('SOG',4,1) 758 if 'PositionAccuracy' in fields: c.addInt ('PositionAccuracy') 759 if dbType != 'postgres': 760 if 'Position_longitude' in fields: c.addDecimal('Position_longitude',8,5) 761 if dbType != 'postgres': 762 if 'Position_latitude' in fields: c.addDecimal('Position_latitude',8,5) 763 if 'COG' in fields: c.addDecimal('COG',4,1) 764 if 'TrueHeading' in fields: c.addInt ('TrueHeading') 765 if 'TimeStamp' in fields: c.addInt ('TimeStamp') 766 if 'RegionalReserved' in fields: c.addInt ('RegionalReserved') 767 if 'Spare' in fields: c.addInt ('Spare') 768 if 'RAIM' in fields: c.addBool('RAIM') 769 if 'state_syncstate' in fields: c.addInt ('state_syncstate') 770 if 'state_slottimeout' in fields: c.addInt ('state_slottimeout') 771 if 'state_slotoffset' in fields: c.addInt ('state_slotoffset') 772 773 if addCoastGuardFields: 774 # c.addInt('cg_rssi') # Relative signal strength indicator 775 # c.addInt('cg_d') # dBm receive strength 776 # c.addInt('cg_T') # Receive timestamp from the AIS equipment 777 # c.addInt('cg_S') # Slot received in 778 # c.addVarChar('cg_x',10) # Idonno 779 c.addVarChar('cg_r',15) # Receiver station ID - should usually be an MMSI, but sometimes is a string 780 c.addInt('cg_sec') # UTC seconds since the epoch 781 782 c.addTimestamp('cg_timestamp') # UTC decoded cg_sec - not actually in the data stream 783 784 if dbType == 'postgres': 785 c.addPostGIS('Position','POINT',2); 786 787 return c
788
789 -def sqlInsertStr(params, outfile=sys.stdout, extraParams=None, dbType='postgres'):
790 ''' 791 Return the SQL INSERT command for this message type 792 @param params: dictionary of values keyed by field name 793 @param outfile: file like object to print to. 794 @param extraParams: A sequence of tuples containing (name,sql type) for additional fields 795 @return: sql create string 796 @rtype: str 797 798 @see: sqlCreate 799 ''' 800 outfile.write(str(sqlInsert(params,extraParams,dbType=dbType)))
801 802
803 -def sqlInsert(params,extraParams=None,dbType='postgres'):
804 ''' 805 Give the SQL INSERT statement 806 @param params: dict keyed by field name of values 807 @param extraParams: any extra fields that you have created beyond the normal ais message fields 808 @rtype: sqlhelp.insert 809 @return: insert class instance 810 @todo: allow optional type checking of params? 811 @warning: this will take invalid keys happily and do what??? 812 ''' 813 import sqlhelp 814 i = sqlhelp.insert('position',dbType=dbType) 815 816 if dbType=='postgres': 817 finished = [] 818 for key in params: 819 if key in finished: 820 continue 821 822 if key not in toPgFields and key not in fromPgFields: 823 if type(params[key])==Decimal: i.add(key,float(params[key])) 824 else: i.add(key,params[key]) 825 else: 826 if key in fromPgFields: 827 val = params[key] 828 # Had better be a WKT type like POINT(-88.1 30.321) 829 i.addPostGIS(key,val) 830 finished.append(key) 831 else: 832 # Need to construct the type. 833 pgName = toPgFields[key] 834 #valStr='GeomFromText(\''+pgTypes[pgName]+'(' 835 valStr=pgTypes[pgName]+'(' 836 vals = [] 837 for nonPgKey in fromPgFields[pgName]: 838 vals.append(str(params[nonPgKey])) 839 finished.append(nonPgKey) 840 valStr+=' '.join(vals)+')' 841 i.addPostGIS(pgName,valStr) 842 else: 843 for key in params: 844 if type(params[key])==Decimal: i.add(key,float(params[key])) 845 else: i.add(key,params[key]) 846 847 if None != extraParams: 848 for key in extraParams: 849 i.add(key,extraParams[key]) 850 851 return i
852 853 854 ###################################################################### 855 # UNIT TESTING 856 ###################################################################### 857 import unittest
858 -def testParams():
859 '''Return a params file base on the testvalue tags. 860 @rtype: dict 861 @return: params based on testvalue tags 862 ''' 863 params = {} 864 params['MessageID'] = 1 865 params['RepeatIndicator'] = 1 866 params['UserID'] = 1193046 867 params['NavigationStatus'] = 3 868 params['ROT'] = -2 869 params['SOG'] = Decimal('101.9') 870 params['PositionAccuracy'] = 1 871 params['Position_longitude'] = Decimal('-122.16328055555556') 872 params['Position_latitude'] = Decimal('37.424458333333334') 873 params['COG'] = Decimal('34.5') 874 params['TrueHeading'] = 41 875 params['TimeStamp'] = 35 876 params['RegionalReserved'] = 0 877 params['Spare'] = 0 878 params['RAIM'] = False 879 params['state_syncstate'] = 2 880 params['state_slottimeout'] = 0 881 params['state_slotoffset'] = 1221 882 883 return params
884
885 -class Testposition(unittest.TestCase):
886 '''Use testvalue tag text from each type to build test case the position message'''
887 - def testEncodeDecode(self):
888 889 params = testParams() 890 bits = encode(params) 891 r = decode(bits) 892 893 # Check that each parameter came through ok. 894 self.failUnlessEqual(r['MessageID'],params['MessageID']) 895 self.failUnlessEqual(r['RepeatIndicator'],params['RepeatIndicator']) 896 self.failUnlessEqual(r['UserID'],params['UserID']) 897 self.failUnlessEqual(r['NavigationStatus'],params['NavigationStatus']) 898 self.failUnlessEqual(r['ROT'],params['ROT']) 899 self.failUnlessAlmostEqual(r['SOG'],params['SOG'],1) 900 self.failUnlessEqual(r['PositionAccuracy'],params['PositionAccuracy']) 901 self.failUnlessAlmostEqual(r['Position_longitude'],params['Position_longitude'],5) 902 self.failUnlessAlmostEqual(r['Position_latitude'],params['Position_latitude'],5) 903 self.failUnlessAlmostEqual(r['COG'],params['COG'],1) 904 self.failUnlessEqual(r['TrueHeading'],params['TrueHeading']) 905 self.failUnlessEqual(r['TimeStamp'],params['TimeStamp']) 906 self.failUnlessEqual(r['RegionalReserved'],params['RegionalReserved']) 907 self.failUnlessEqual(r['Spare'],params['Spare']) 908 self.failUnlessEqual(r['RAIM'],params['RAIM']) 909 self.failUnlessEqual(r['state_syncstate'],params['state_syncstate']) 910 self.failUnlessEqual(r['state_slottimeout'],params['state_slottimeout']) 911 self.failUnlessEqual(r['state_slotoffset'],params['state_slotoffset'])
912
913 -def addMsgOptions(parser):
914 parser.add_option('-d','--decode',dest='doDecode',default=False,action='store_true', 915 help='decode a "position" AIS message') 916 parser.add_option('-e','--encode',dest='doEncode',default=False,action='store_true', 917 help='encode a "position" AIS message') 918 parser.add_option('--RepeatIndicator-field', dest='RepeatIndicatorField',default=0,metavar='uint',type='int' 919 ,help='Field parameter value [default: %default]') 920 parser.add_option('--UserID-field', dest='UserIDField',metavar='uint',type='int' 921 ,help='Field parameter value [default: %default]') 922 parser.add_option('--NavigationStatus-field', dest='NavigationStatusField',default=15,metavar='uint',type='int' 923 ,help='Field parameter value [default: %default]') 924 parser.add_option('--ROT-field', dest='ROTField',default=-128,metavar='int',type='int' 925 ,help='Field parameter value [default: %default]') 926 parser.add_option('--SOG-field', dest='SOGField',default=Decimal('102.3'),metavar='udecimal',type='string' 927 ,help='Field parameter value [default: %default]') 928 parser.add_option('--PositionAccuracy-field', dest='PositionAccuracyField',metavar='uint',type='int' 929 ,help='Field parameter value [default: %default]') 930 parser.add_option('--Position_longitude-field', dest='Position_longitudeField',default=Decimal('181'),metavar='decimal',type='string' 931 ,help='Field parameter value [default: %default]') 932 parser.add_option('--Position_latitude-field', dest='Position_latitudeField',default=Decimal('91'),metavar='decimal',type='string' 933 ,help='Field parameter value [default: %default]') 934 parser.add_option('--COG-field', dest='COGField',default=Decimal('360'),metavar='udecimal',type='string' 935 ,help='Field parameter value [default: %default]') 936 parser.add_option('--TrueHeading-field', dest='TrueHeadingField',default=511,metavar='uint',type='int' 937 ,help='Field parameter value [default: %default]') 938 parser.add_option('--TimeStamp-field', dest='TimeStampField',default=60,metavar='uint',type='int' 939 ,help='Field parameter value [default: %default]') 940 parser.add_option('--RAIM-field', dest='RAIMField',metavar='bool',type='int' 941 ,help='Field parameter value [default: %default]') 942 parser.add_option('--state_syncstate-field', dest='state_syncstateField',metavar='uint',type='int' 943 ,help='Field parameter value [default: %default]') 944 parser.add_option('--state_slottimeout-field', dest='state_slottimeoutField',metavar='uint',type='int' 945 ,help='Field parameter value [default: %default]') 946 parser.add_option('--state_slotoffset-field', dest='state_slotoffsetField',metavar='uint',type='int' 947 ,help='Field parameter value [default: %default]')
948 949 ############################################################ 950 if __name__=='__main__': 951 952 from optparse import OptionParser 953 parser = OptionParser(usage="%prog [options]", 954 version="%prog "+__version__) 955 956 parser.add_option('--doc-test',dest='doctest',default=False,action='store_true', 957 help='run the documentation tests') 958 parser.add_option('--unit-test',dest='unittest',default=False,action='store_true', 959 help='run the unit tests') 960 parser.add_option('-v','--verbose',dest='verbose',default=False,action='store_true', 961 help='Make the test output verbose') 962 963 # FIX: remove nmea from binary messages. No way to build the whole packet? 964 # FIX: or build the surrounding msg 8 for a broadcast? 965 typeChoices = ('binary','nmeapayload','nmea') # FIX: what about a USCG type message? 966 parser.add_option('-t','--type',choices=typeChoices,type='choice',dest='ioType' 967 ,default='nmeapayload' 968 ,help='What kind of string to write for encoding ('+', '.join(typeChoices)+') [default: %default]') 969 970 971 outputChoices = ('std','html','csv','sql' , 'kml','kml-full') 972 parser.add_option('-T','--output-type',choices=outputChoices,type='choice',dest='outputType' 973 ,default='std' 974 ,help='What kind of string to output ('+', '.join(outputChoices)+') [default: %default]') 975 976 parser.add_option('-o','--output',dest='outputFileName',default=None, 977 help='Name of the python file to write [default: stdout]') 978 979 parser.add_option('-f','--fields',dest='fieldList',default=None, action='append', 980 choices=fieldList, 981 help='Which fields to include in the output. Currently only for csv output [default: all]') 982 983 parser.add_option('-p','--print-csv-field-list',dest='printCsvfieldList',default=False,action='store_true', 984 help='Print the field name for csv') 985 986 parser.add_option('-c','--sql-create',dest='sqlCreate',default=False,action='store_true', 987 help='Print out an sql create command for the table.') 988 989 dbChoices = ('sqlite','postgres') 990 parser.add_option('-D','--db-type',dest='dbType',default='postgres' 991 ,choices=dbChoices,type='choice' 992 ,help='What kind of database ('+', '.join(dbChoices)+') [default: %default]') 993 994 addMsgOptions(parser) 995 996 (options,args) = parser.parse_args() 997 success=True 998 999 if options.doctest: 1000 import os; print os.path.basename(sys.argv[0]), 'doctests ...', 1001 sys.argv= [sys.argv[0]] 1002 if options.verbose: sys.argv.append('-v') 1003 import doctest 1004 numfail,numtests=doctest.testmod() 1005 if numfail==0: print 'ok' 1006 else: 1007 print 'FAILED' 1008 success=False 1009 1010 if not success: sys.exit('Something Failed') 1011 del success # Hide success from epydoc 1012 1013 if options.unittest: 1014 sys.argv = [sys.argv[0]] 1015 if options.verbose: sys.argv.append('-v') 1016 unittest.main() 1017 1018 outfile = sys.stdout 1019 if None!=options.outputFileName: 1020 outfile = file(options.outputFileName,'w') 1021 1022 1023 if options.doEncode: 1024 # First make sure all non required options are specified 1025 if None==options.RepeatIndicatorField: parser.error("missing value for RepeatIndicatorField") 1026 if None==options.UserIDField: parser.error("missing value for UserIDField") 1027 if None==options.NavigationStatusField: parser.error("missing value for NavigationStatusField") 1028 if None==options.ROTField: parser.error("missing value for ROTField") 1029 if None==options.SOGField: parser.error("missing value for SOGField") 1030 if None==options.PositionAccuracyField: parser.error("missing value for PositionAccuracyField") 1031 if None==options.Position_longitudeField: parser.error("missing value for Position_longitudeField") 1032 if None==options.Position_latitudeField: parser.error("missing value for Position_latitudeField") 1033 if None==options.COGField: parser.error("missing value for COGField") 1034 if None==options.TrueHeadingField: parser.error("missing value for TrueHeadingField") 1035 if None==options.TimeStampField: parser.error("missing value for TimeStampField") 1036 if None==options.RAIMField: parser.error("missing value for RAIMField") 1037 if None==options.state_syncstateField: parser.error("missing value for state_syncstateField") 1038 if None==options.state_slottimeoutField: parser.error("missing value for state_slottimeoutField") 1039 if None==options.state_slotoffsetField: parser.error("missing value for state_slotoffsetField") 1040 msgDict={ 1041 'MessageID': '1', 1042 'RepeatIndicator': options.RepeatIndicatorField, 1043 'UserID': options.UserIDField, 1044 'NavigationStatus': options.NavigationStatusField, 1045 'ROT': options.ROTField, 1046 'SOG': options.SOGField, 1047 'PositionAccuracy': options.PositionAccuracyField, 1048 'Position_longitude': options.Position_longitudeField, 1049 'Position_latitude': options.Position_latitudeField, 1050 'COG': options.COGField, 1051 'TrueHeading': options.TrueHeadingField, 1052 'TimeStamp': options.TimeStampField, 1053 'RegionalReserved': '0', 1054 'Spare': '0', 1055 'RAIM': options.RAIMField, 1056 'state_syncstate': options.state_syncstateField, 1057 'state_slottimeout': options.state_slottimeoutField, 1058 'state_slotoffset': options.state_slotoffsetField, 1059 } 1060 1061 bits = encode(msgDict) 1062 if 'binary'==options.ioType: print str(bits) 1063 elif 'nmeapayload'==options.ioType: 1064 # FIX: figure out if this might be necessary at compile time 1065 print "bitLen",len(bits) 1066 bitLen=len(bits) 1067 if bitLen%6!=0: 1068 bits = bits + BitVector(size=(6 - (bitLen%6))) # Pad out to multiple of 6 1069 print "result:",binary.bitvectoais6(bits)[0] 1070 1071 1072 # FIX: Do not emit this option for the binary message payloads. Does not make sense. 1073 elif 'nmea'==options.ioType: sys.exit("FIX: need to implement this capability") 1074 else: sys.exit('ERROR: unknown ioType. Help!') 1075 1076 1077 if options.sqlCreate: 1078 sqlCreateStr(outfile,options.fieldList,dbType=options.dbType) 1079 1080 if options.printCsvfieldList: 1081 # Make a csv separated list of fields that will be displayed for csv 1082 if None == options.fieldList: options.fieldList = fieldList 1083 import StringIO 1084 buf = StringIO.StringIO() 1085 for field in options.fieldList: 1086 buf.write(field+',') 1087 result = buf.getvalue() 1088 if result[-1] == ',': print result[:-1] 1089 else: print result 1090 1091 if options.doDecode: 1092 for msg in args: 1093 bv = None 1094 1095 if msg[0] in ('$','!') and msg[3:6] in ('VDM','VDO'): 1096 # Found nmea 1097 # FIX: do checksum 1098 bv = binary.ais6tobitvec(msg.split(',')[5]) 1099 else: # either binary or nmeapayload... expect mostly nmeapayloads 1100 # assumes that an all 0 and 1 string can not be a nmeapayload 1101 binaryMsg=True 1102 for c in msg: 1103 if c not in ('0','1'): 1104 binaryMsg=False 1105 break 1106 if binaryMsg: 1107 bv = BitVector(bitstring=msg) 1108 else: # nmeapayload 1109 bv = binary.ais6tobitvec(msg) 1110 1111 printFields(decode(bv) 1112 ,out=outfile 1113 ,format=options.outputType 1114 ,fieldList=options.fieldList 1115 ,dbType=options.dbType 1116 ) 1117