-
Notifications
You must be signed in to change notification settings - Fork 1
/
get-metar-conditions-inc.php
1316 lines (1215 loc) · 48.5 KB
/
get-metar-conditions-inc.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
<?php
/*
Function: mtr_conditions($icao, $curtime, $sunrise, $sunset)
Purpose: fetch and cache a nearby METAR to use to show a conditions icon and text based on
the current METAR weather report and sky conditions.
The iconnumber (matching the Weather-Display set of icons from 0-35) is returned.
Arguments: $icao is the 4-character UPPERCASE identifier of the METAR (e.g. 'KSJC' etc.).
$curtime is the current time in hh:mm([am|pm]) - defaults to current time
$sunrise is the time of local sunrise hh:mm([am|pm]) - defaults to 07:00
$sunset is the time of local sunset hh:mm([am|pm]) - defaults to 19:00
The times are used to select a day or night version for the icon
Calling sequence:
list($Currentsolardescription,$iconnumber,$icongraphic,$icontext) =
mtr_conditions($icao, $curtime, $sunrise, $sunset);
where
$Currentsolardescription will contain a string of the text representing the metar weather and sky conditions.
$iconnumber will be a number from 0 to 35 representing the WD icon number appropriate for the METAR weather and sky
$icongraphic will be the name of the .gif file in ./ajax-images/ which matches the iconnumber
$icontext will contain the alternative (WD text) destription of the icon (mostly for debugging purposes).
Examples from METAR
KSJC='2011/01/22 22:53 KSJC 222253Z 28011KT 10SM FEW160 BKN180 21/05 A2996 RMK AO2 SLP145 T02110050'
Array
(
[0] => Mostly Cloudy
[1] => 2
[2] => day_partly_cloudy.gif
[3] => Cloudy
)
KCDR='2011/01/23 00:01 KCDR 230001Z AUTO 02018KT 1/4SM -SN FZFG BKN007 OVC012 M06/M07 A2986 RMK AO2 PRESRR P0000'
Array
(
[0] => Light Snow, Freezing Fog, Overcast
[1] => 16
[2] => night_snow.gif
[3] => Snow
)
WIOO='2011/01/22 23:30 WIOO 222330Z 00000KT 3000 FU FEW011CB BKN008 25/25 Q1011 TEMPO AT0000 5000 -RA'
Array
(
[0] => Smoke, Mostly Cloudy
[1] => 7
[2] => haze.gif
[3] => Haze
)
Author: Ken True - [email protected] (with a lot of code borrowed from my own works and others :)
Referemce: METAR Coding http://www.ofcm.gov/fmh-1/pdf/L-CH12.pdf from Federal Meteorological Handbook No. 1 (FCM-H1-2005)
Also see: http://en.wikipedia.org/wiki/METAR for more descriptions.
Note: Runway conditions are not decoded by this function.
Version 1.00 - 21-Jan-2011 - initial release
Version 1.01 - 24-Mar-2011 - added optional return of large-icon .jpg image name for condition and $metar array.
Version 1.02 - 10-Aug-2011 - fixes for function name collisions with *-mesomap.php programs
Version 1.03 - 01-Oct-2011 - added support for alternative animated icon set from http://www.meteotreviglio.com/
Version 1.04 - 09-Oct-2011 - fixed issue with 'RA' (rain) condition non-detection
Version 1.05 - 17-Nov-2011 - added $metarGMT optional return and UOM specs
Version 1.06 - 19-Nov-2011 - fixed formatting for Wind Chill
Version 1.07 - 19-Nov-2011 - fixed runway decode for European METARs
Version 1.08 - 22-Nov-2011 - fixed Notice: type errata
Version 1.09 - 23-Nov-2011 - fix for metar reports with >1 runway reports or limited visibility reports
Version 1.10 - 24-Nov-2011 - fix for CAVOK with km/miles selection based on wind units
Version 1.11 - 29-Nov-2011 - added cloud-details return for wxmetar.php page
Version 1.12 - 04-May-2012 - added fix for variable wind decode like VRB02G03KT
Version 1.13 - 31-Aug-2012 - added fixes for incomplete visibility and multiple conditions decode
*/
global $Debug, $GMCVersion;
$GMCVersion = 'get-metar-conditions-inc.php - Version 1.13 - 31-Aug-2012';
if (isset($_REQUEST['sce']) && ( strtolower($_REQUEST['sce']) == 'view' or
strtolower($_REQUEST['sce']) == 'show') ) {
//--self downloader --
$filenameReal = __FILE__;
$download_size = filesize($filenameReal);
header('Pragma: public');
header('Cache-Control: private');
header('Cache-Control: no-cache, must-revalidate');
header("Content-type: text/plain");
header("Accept-Ranges: bytes");
header("Content-Length: $download_size");
header('Connection: close');
readfile($filenameReal);
exit;
}
// local settings
$cacheFileDir = './'; // default cache file directory
global $cacheFileDir;
//------------ override from Settings.php --------------------
global $SITE;
if(isset($SITE['cacheFileDir'])) {$cacheFileDir = $SITE['cacheFileDir']; }
//------------ end override from Settings.php ----------------
# ------------------------------------------------------------------------------
# main function mtr_conditions
#-------------------------------------------------------------------------------
function mtr_conditions ($icao,$curtime='',$sunrise='',$sunset='',$useJpgIcon=false,$UOM='°F,mph,inHg,in') {
global $lang, $Debug, $mtrInfo, $metarPtr, $group, $GMCVersion;
global $Icons, $IconsLarge, $IconsText, $cacheFileDir;
$metarCacheName = $cacheFileDir."metarcache-$icao.txt";
$metarRefetchSeconds = 600; // fetch every 10 minutes
list($uomTemp,$uomWind,$uomBaro,$uomRain) = explode(',',$UOM.',,,,');
global $UOMS;
$UOMS = array(
'TEMP' => "$uomTemp",
'WIND' => "$uomWind",
'BARO' => "$uomBaro",
'RAIN' => "$uomRain"
);
if(isset($_REQUEST['cache']) and strtolower($_REQUEST['cache']) == 'refresh') {
$metarRefetchSeconds = 0;
}
if(isset($_REQUEST['cache']) and strtolower($_REQUEST['cache']) == 'norefresh') {
$metarRefetchSeconds = 9999999;
}
$mtrInfo = array();
$Debug .= "<!-- $GMCVersion -->\n";
// $Debug .= "<!-- UOMS\n".print_r($UOMS,true)."-->\n";
if(isset($icao) and strlen($icao) == 4) {
$Debug .= "<!-- mtr_conditions using METAR ICAO='$icao' -->\n";
$host = 'weather.noaa.gov';
$path = '/pub/data/observations/metar/stations/';
$metarURL = 'http://' . $host . $path . $icao . '.TXT';
$html = '';
$raw = '';
// get the metar data from the cache or from the URL if the cache is 'stale'
if (file_exists($metarCacheName) and filemtime($metarCacheName) + $metarRefetchSeconds > time()) {
$WhereLoaded = "from cache $metarCacheName";
$html = implode('', file($metarCacheName));
} else {
$WhereLoaded = "from URL $metarURL";
$rawhtml = mtr_fetchUrlWithoutHanging($metarURL);
$i = strpos($rawhtml,"\r\n\r\n");
$headers = substr($rawhtml,0,$i-1);
$content = substr($rawhtml,$i+2);
$RC = '';
if (preg_match("|^HTTP\/\S+ (.*)\r\n|",$rawhtml,$matches)) {
$RC = trim($matches[1]);
}
if(!preg_match('|200 |',$RC)) {
$t = array("unable to load $icao data RC=$RC",5,'day_partly_cloudy.gif',"unable to load $icao data RC=$RC",array(),$metarGMT);
$Debug .= "<!-- mtr_conditions returns RC='".$RC."' for ICAO/METAR='$icao' -->\n";
return $t;
}
if(preg_match('|Content-Encoding: gzip|Ui',$headers)) {
$Debug .= "<!-- Webserver returned gzipped data, dang 'em -- unzipping response -->\n";
// $Debug .= "<!-- content='".$content."' -->\n";
$err = 'None';
$html = trim(mtr_gzdecode($content,$err));
$Debug .= "<!-- mtr_gzdecode err='$err' -->\n";
if($err <> 'None') {
$Debug .= "<!-- contentX='".bin2hex($content).". -->\n";
}
} else {
$html = $content;
}
$fp = fopen($metarCacheName, "w");
if($fp) {
$write = fputs($fp, $html);
fclose($fp);
} else {
$Debug .= "<!--Unable to write cache $metarCacheName -->\n";
}
} // end of get the METAR from cache or URL
$raw_metar = preg_replace("/[\n\r ]+/", ' ', trim(implode(' ', (array)$html)));
$Debug .= "<!-- loaded $WhereLoaded -->\n";
$Debug .= "<!-- $icao='$raw_metar' -->\n";
$metar = trim($raw_metar);
$metarDate = preg_replace('|/|','-',substr($metar,0,16)) . ':00 GMT';
$metarGMT = strtotime($metarDate);
$age = abs(time() - $metarDate); // age in seconds
$Debug .= "<!-- age=$age sec '$metarDate' -->\n";
mtr_load_iconDefs(); // initialize ICON defs to use and lookup arrays
/*
Metar formatter expects
CYXU='2010/11/30 23:00 CYXU 302300Z 15013G18KT 5SM -RA BR OVC005 11/10 A2969 RMK SF8 SLP059'
*/
// Clean up the metar.. some are not properly formatted, human made, most likely
$unprocMetar = $metar;
$metar = preg_replace('|[\r\n]+|is','',$metar); // remove internal newlines
$metar = preg_replace('|/////KT|is','VRB00KT',$metar); // replace bogus wind report
$metar = preg_replace('|@|is','',$metar); // remove strange @ in metar
$metar = preg_replace('|///|is',' ',$metar); // remove strange standalone slashes
$metar = preg_replace('| /|is',' ',$metar); // remove strange standalone slashes
$metar = preg_replace('| / |is',' ',$metar); // remove strange standalone slashes
$metar = preg_replace('| \s+|is',' ',$metar); // remove multiple spaces
$metar = preg_replace('| COR |i',' ',$metar); // remove COR (correction) from raw metar
$metar = preg_replace('|(\d{5}) KT|i','${1}KT',$metar); // fix any space in wind value
$metar = preg_replace('| 999 |',' 9999 ',$metar); // fix malformed unlimited visibility
$metar = preg_replace('| LRA |',' -RA ',$metar); // fix malformed light rain
$metar = preg_replace('| HRA |',' +RA ',$metar); // fix malformed light rain
// $metar = preg_replace('| (\d)SM|i',' 0${1}SM',$metar); // fix malformed visibility to two digits
// $metar = preg_replace('| (\d+) (\d+)/(\d+)SM |i',' $1_$2/${3}SM ',$metar); // fix NOAA visibility
mtr_process($metar,$icao); // actually parse the metar for conditions.. results in $mtrInfo array
// assemble the conditions string:
// use conditions first
// use sky (clouds) second
//
$mtrInfo['RAW-METAR'] = $unprocMetar;
$Sky = isset($mtrInfo['CLOUDS'])?trim($mtrInfo['CLOUDS']):'';
$Weather = isset($mtrInfo['CONDITIONS'])?trim($mtrInfo['CONDITIONS']):'';
$Conds = $Weather; // Choose any conditions report first
if($Sky <> '' and $Conds <> '') {$Conds .= ", $Sky"; } // append a clouds descriptor if available
if($Conds == '' and $Sky <> '') {$Conds = $Sky; } // no weathercond .. use sky only
$iconnumber = mtr_get_iconnumber('',$Conds,$sunrise,$sunset);
if(!$useJpgIcon) {
$useicon = $Icons[$iconnumber];
} else {
$useicon = $IconsLarge[$iconnumber];
}
$icondescr = $IconsText[$iconnumber];
$t = array($Conds,$iconnumber,$useicon,$icondescr,$mtrInfo,$metarGMT);
} else {
$t = array("$icao not loaded",5,'day_partly_cloudy.gif',"unable to load data RC=$RC",array(),$metarGMT);
} // end of ICAO processing
$Debug .= "<!-- mtr_conditions returns '".$t[0]."' iconnumber='".$t[1]."' img='".$t[2]."' comment='".$t[3]."' -->\n";
return $t;
}
// ------------------------------------------------------------
// get contents from one URL and return as string
function mtr_fetchUrlWithoutHanging($url,$useFopen=false) {
// thanks to Tom at Carterlake.org for this script fragment
global $Debug, $needCookie,$timeStamp,$TOTALtime;
$overall_start = time();
if (! $useFopen) {
// Set maximum number of seconds (can have floating-point) to wait for feed before displaying page without feed
$numberOfSeconds=5;
// Suppress error reporting so Web site visitors are unaware if the feed fails
error_reporting(0);
// Extract resource path and domain from URL ready for fsockopen
$FullUrl = $url;
$urlParts = parse_url($url);
$domain = $urlParts['host'];
if(isset($urlParts['port'])) {
$port = $urlParts['port'];
} else {
$port = 80;
}
$resourcePath = $urlParts['path'];
$resourcePath = preg_replace('|nocache|','?'.$timeStamp,$resourcePath);
if(isset($urlParts['query'])) {$resourcePath .= "?" . $urlParts['query']; }
if(isset($urlParts['fragment'])) {$resourcePath .= "#" . $urlParts['fragment']; }
$T_start = mtr_microtime_float();
$hostIP = gethostbyname($domain);
$T_dns = mtr_microtime_float();
$ms_dns = sprintf("%01.3f",round($T_dns - $T_start,3));
$Debug .= "<!-- GET $resourcePath HTTP/1.1 \n Host: $domain Port: $port IP=$hostIP-->\n";
// print "GET $resourcePath HTTP/1.1 \n Host: $domain Port: $port IP=$hostIP\n";
// Establish a connection
$socketConnection = fsockopen($hostIP, $port, $errno, $errstr, $numberOfSeconds);
$T_connect = mtr_microtime_float();
$T_puts = 0;
$T_gets = 0;
$T_close = 0;
if (!$socketConnection)
{
// You may wish to remove the following debugging line on a live Web site
$Debug .= "<!-- Network error: $errstr ($errno) -->\n";
// print "Network error: $errstr ($errno)\n";
} // end if
else {
$xml = '';
$getString = "GET $resourcePath HTTP/1.1\r\nHost: $domain\r\nConnection: Close\r\n";
if (isset($needCookie[$domain])) {
$getString .= $needCookie[$domain] . "\r\n";
$Debug .= "<!-- cookie used '" . $needCookie[$domain] . "' for GET to $domain -->\n";
}
$getString .= "User-agent: Mesomap Loader\r\nAccept: text/plain,text/html\r\nAccept-Encoding: gzip;q=0,compress;q=0\r\n";
$getString .= "\r\n";
// print "Sending:\n$getString\n\n";
fputs($socketConnection, $getString);
$T_puts = mtr_microtime_float();
// Loop until end of file
$TGETstats = array();
$TGETcount = 0;
while (!feof($socketConnection))
{
$T_getstart = mtr_microtime_float();
$xml .= fgets($socketConnection, 16384);
$T_getend = mtr_microtime_float();
$TGETcount++;
$TGETstats[$TGETcount] = sprintf("%01.3f",round($T_getend - $T_getstart,3));
} // end while
$T_gets = mtr_microtime_float();
fclose ($socketConnection);
$T_close = mtr_microtime_float();
} // end else
$ms_connect = sprintf("%01.3f",round($T_connect - $T_dns,3));
if($T_close > 0) {
$ms_puts = sprintf("%01.3f",round($T_puts - $T_connect,3));
$ms_gets = sprintf("%01.3f",round($T_gets - $T_puts,3));
$ms_close = sprintf("%01.3f",round($T_close - $T_gets,3));
$ms_total = sprintf("%01.3f",round($T_close - $T_start,3));
} else {
$ms_puts = 'n/a';
$ms_gets = 'n/a';
$ms_close = 'n/a';
$ms_total = sprintf("%01.3f",round($T_connect - $T_start,3));
}
$Debug .= "<!-- HTTP stats: dns=$ms_dns conn=$ms_connect put=$ms_puts get($TGETcount blocks)=$ms_gets close=$ms_close total=$ms_total secs -->\n";
// print "HTTP stats: dns=$ms_dns conn=$ms_connect put=$ms_puts get($TGETcount blocks)=$ms_gets close=$ms_close total=$ms_total secs \n";
// foreach ($TGETstats as $block => $mstimes) {
// print "HTTP Block $block took $mstimes\n";
// }
$TOTALtime+= ($T_close - $T_start);
$overall_end = time();
$overall_elapsed = $overall_end - $overall_start;
$Debug .= "<!-- fetch function elapsed= $overall_elapsed secs. -->\n";
// print "fetch function elapsed= $overall_elapsed secs.\n";
return($xml);
} else {
// print "<!-- using file function -->\n";
$T_start = mtr_microtime_float();
$xml = implode('',file($url));
$T_close = mtr_microtime_float();
$ms_total = sprintf("%01.3f",round($T_close - $T_start,3));
$Debug .= "<!-- file() stats: total=$ms_total secs -->\n";
// print " file() stats: total=$ms_total secs.\n";
$TOTALtime+= ($T_close - $T_start);
$overall_end = time();
$overall_elapsed = $overall_end - $overall_start;
$Debug .= "<!-- fetch function elapsed= $overall_elapsed secs. -->\n";
// print "fetch function elapsed= $overall_elapsed secs.\n";
return($xml);
}
} // end mtr_fetchUrlWithoutHanging
// ------------------------------------------------------------------
function mtr_microtime_float()
{
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}
// ------------------------------------------------------------------
function mtr_gzdecode($rawdata,&$error='',&$filename='',$maxlength=null)
{
//0d0a1f8b0800000000000003454d390ec3300cdbfb0aee45654a71e463ed5ef40bdd0214feff5adb49130814285122d502535082
if(strcmp(substr($data,0,2),"\x0d\x0a")) { // got an extra \r\n in the data?
$data = substr($rawdata,2);
} else {
$data = $rawdata;
}
$len = strlen($data);
if ($len < 18 || strcmp(substr($data,0,2),"\x1f\x8b")) {
$error = "Not in GZIP format.";
return null; // Not GZIP format (See RFC 1952)
}
$method = ord(substr($data,2,1)); // Compression method
$flags = ord(substr($data,3,1)); // Flags
if ($flags & 31 != $flags) {
$error = "Reserved bits not allowed.";
return null;
}
// NOTE: $mtime may be negative (PHP integer limitations)
$mtime = unpack("V", substr($data,4,4));
$mtime = $mtime[1];
$xfl = substr($data,8,1);
$os = substr($data,8,1);
$headerlen = 10;
$extralen = 0;
$extra = "";
if ($flags & 4) {
// 2-byte length prefixed EXTRA data in header
if ($len - $headerlen - 2 < 8) {
return false; // invalid
}
$extralen = unpack("v",substr($data,8,2));
$extralen = $extralen[1];
if ($len - $headerlen - 2 - $extralen < 8) {
return false; // invalid
}
$extra = substr($data,10,$extralen);
$headerlen += 2 + $extralen;
}
$filenamelen = 0;
$filename = "";
if ($flags & 8) {
// C-style string
if ($len - $headerlen - 1 < 8) {
return false; // invalid
}
$filenamelen = strpos(substr($data,$headerlen),chr(0));
if ($filenamelen === false || $len - $headerlen - $filenamelen - 1 < 8) {
return false; // invalid
}
$filename = substr($data,$headerlen,$filenamelen);
$headerlen += $filenamelen + 1;
}
$commentlen = 0;
$comment = "";
if ($flags & 16) {
// C-style string COMMENT data in header
if ($len - $headerlen - 1 < 8) {
return false; // invalid
}
$commentlen = strpos(substr($data,$headerlen),chr(0));
if ($commentlen === false || $len - $headerlen - $commentlen - 1 < 8) {
return false; // Invalid header format
}
$comment = substr($data,$headerlen,$commentlen);
$headerlen += $commentlen + 1;
}
$headercrc = "";
if ($flags & 2) {
// 2-bytes (lowest order) of CRC32 on header present
if ($len - $headerlen - 2 < 8) {
return false; // invalid
}
$calccrc = crc32(substr($data,0,$headerlen)) & 0xffff;
$headercrc = unpack("v", substr($data,$headerlen,2));
$headercrc = $headercrc[1];
if ($headercrc != $calccrc) {
$error = "Header checksum failed.";
return false; // Bad header CRC
}
$headerlen += 2;
}
// GZIP FOOTER
$datacrc = unpack("V",substr($data,-8,4));
$datacrc = sprintf('%u',$datacrc[1] & 0xFFFFFFFF);
$isize = unpack("V",substr($data,-4));
$isize = $isize[1];
// decompression:
$bodylen = $len-$headerlen-8;
if ($bodylen < 1) {
// IMPLEMENTATION BUG!
return null;
}
$body = substr($data,$headerlen,$bodylen);
$data = "";
if ($bodylen > 0) {
switch ($method) {
case 8:
// Currently the only supported compression method:
$data = gzinflate($body,$maxlength);
break;
default:
$error = "Unknown compression method.";
return false;
}
} // zero-byte body content is allowed
// Verifiy CRC32
$crc = sprintf("%u",crc32($data));
$crcOK = $crc == $datacrc;
$lenOK = $isize == strlen($data);
if (!$lenOK || !$crcOK) {
$error = ( $lenOK ? '' : 'Length check FAILED. ') . ( $crcOK ? '' : 'Checksum FAILED.');
return false;
}
return $data;
}
// ------------------------------------------------------------------
function mtr_load_iconDefs () {
global $Icons, $IconsLarge, $IconsText, $Conditions, $Debug;
// CURRENT CONDITIONS ICONS FOR clientraw.txt
// create array for icons. There are 35 possible values in clientraw.txt
// It would be simpler to do this with array() but to make it easier to
// modify each element is defined individually. Each index [#] corresponds
// to the value provided in clientraw.txt
$Icons[0] = "day_clear.gif"; // image sunny.visible
$Icons[1] = "night_clear.gif"; // image clearnight.visible
$Icons[2] = "day_partly_cloudy.gif"; // image cloudy.visible
$Icons[3] = "day_partly_cloudy.gif"; // image cloudy2.visible
$Icons[4] = "night_partly_cloudy.gif"; // image night cloudy.visible
$Icons[5] = "day_clear.gif"; // image dry.visible
$Icons[6] = "fog.gif"; // image fog.visible
$Icons[7] = "haze-sm.gif"; // image haze.visible
$Icons[8] = "day_heavy_rain.gif"; // image heavyrain.visible
$Icons[9] = "day_mostly_sunny.gif"; // image mainlyfine.visible
$Icons[10] = "mist-sm.gif"; // image mist.visible
$Icons[11] = "fog.gif"; // image night fog.visible
$Icons[12] = "night_heavy_rain.gif"; // image night heavyrain.visible
$Icons[13] = "night_cloudy.gif"; // image night overcast.visible
$Icons[14] = "night_rain.gif"; // image night rain.visible
$Icons[15] = "night_light_rain.gif"; // image night showers.visible
$Icons[16] = "night_snow.gif"; // image night snow.visible
$Icons[17] = "night_tstorm.gif"; // image night thunder.visible
$Icons[18] = "day_cloudy.gif"; // image overcast.visible
$Icons[19] = "day_partly_cloudy.gif"; // image partlycloudy.visible
$Icons[20] = "day_rain.gif"; // image rain.visible
$Icons[21] = "day_rain.gif"; // image rain2.visible
$Icons[22] = "day_light_rain.gif"; // image showers2.visible
$Icons[23] = "sleet.gif"; // image sleet.visible
$Icons[24] = "sleet.gif"; // image sleetshowers.visible
$Icons[25] = "day_snow.gif"; // image snow.visible
$Icons[26] = "day_snow.gif"; // image snowmelt.visible
$Icons[27] = "day_snow.gif"; // image snowshowers2.visible
$Icons[28] = "day_clear.gif"; // image sunny.visible
$Icons[29] = "day_tstorm.gif"; // image thundershowers.visible
$Icons[30] = "day_tstorm.gif"; // image thundershowers2.visible
$Icons[31] = "day_tstorm.gif"; // image thunderstorms.visible
$Icons[32] = "tornado.gif"; // image tornado.visible
$Icons[33] = "windy-sm.gif"; // image windy.visible
$Icons[34] = "day_partly_cloudy.gif"; // stopped rainning
$Icons[35] = "windyrain-sm.gif"; // wind + rain
$IconsText[0] = 'Sunny';
$IconsText[1] = 'Clear';
$IconsText[2] = 'Cloudy';
$IconsText[3] = 'Cloudy2';
$IconsText[4] = 'Partly Cloudy';
$IconsText[5] = 'Dry';
$IconsText[6] = 'Fog';
$IconsText[7] = 'Haze';
$IconsText[8] = 'Heavy Rain';
$IconsText[9] = 'Mainly Fine';
$IconsText[10] = 'Mist';
$IconsText[11] = 'Fog';
$IconsText[12] = 'Heavy Rain';
$IconsText[13] = 'Overcast';
$IconsText[14] = 'Rain';
$IconsText[15] = 'Showers';
$IconsText[16] = 'Snow';
$IconsText[17] = 'Thunder';
$IconsText[18] = 'Overcast';
$IconsText[19] = 'Partly Cloudy';
$IconsText[20] = 'Rain';
$IconsText[21] = 'Rain2';
$IconsText[22] = 'Showers2';
$IconsText[23] = 'Sleet';
$IconsText[24] = 'Sleet Showers';
$IconsText[25] = 'Snow';
$IconsText[26] = 'Snow Melt';
$IconsText[27] = 'Snow Showers2';
$IconsText[28] = 'Sunny';
$IconsText[29] = 'Thunder Showers';
$IconsText[30] = 'Thunder Showers2';
$IconsText[31] = 'Thunder Storms';
$IconsText[32] = 'Tornado';
$IconsText[33] = 'Windy';
$IconsText[34] = 'Stopped Raining';
$IconsText[35] = 'Wind/Rain';
$IconsLarge = array(
"skc.jpg", // 0 imagesunny.visible
"nskc.jpg", // 1 imageclearnight.visible
"bkn.jpg", // 2 imagecloudy.visible
"sct.jpg", // 3 imagecloudy2.visible
"nbkn.jpg", // 4 imagecloudynight.visible
"sct.jpg", // 5 imagedry.visible
"fg.jpg", // 6 imagefog.visible
"hazy.jpg", // 7 imagehaze.visible
"ra.jpg", // 8 imageheavyrain.visible
"few.jpg", // 9 imagemainlyfine.visible
"mist.jpg", // 10 imagemist.visible
"nfg.jpg", // 11 imagenightfog.visible
"nra.jpg", // 12 imagenightheavyrain.visible
"novc.jpg", // 13 imagenightovercast.visible
"nra.jpg", // 14 imagenightrain.visible
"nshra.jpg", // 15 imagenightshowers.visible
"nsn.jpg", // 16 imagenightsnow.visible
"ntsra.jpg", // 17 imagenightthunder.visible
"ovc.jpg", // 18 imageovercast.visible
"sct.jpg", // 19 imagepartlycloudy.visible
"ra.jpg", // 20 imagerain.visible
"ra.jpg", // 21 imagerain2.visible
"shra.jpg", // 22 imageshowers2.visible
"ip.jpg", // 23 imagesleet.visible
"ip.jpg", // 24 imagesleetshowers.visible
"sn.jpg", // 25 imagesnow.visible
"sn.jpg", // 26 imagesnowmelt.visible
"sn.jpg", // 27 imagesnowshowers2.visible
"skc.jpg", // 28 imagesunny.visible
"scttsra.jpg", // 29 imagethundershowers.visible
"hi_tsra.jpg", // 30 imagethundershowers2.visible
"tsra.jpg", // 31 imagethunderstorms.visible
"nsvrtsra.jpg", // 32 imagetornado.visible
"wind.jpg", // 33 imagewindy.visible
"ra1.jpg", // 34 stopped rainning
"windyrain.jpg" // 35 windy/rain
);
/* the following is a lookup table for conditions text from the metar to return
the WD Icon number above. It is sorted such that the most severe conditions
are at the top of the list, with least severe at the bottom. This is done
so that significant weather icon will prevail when multiple conditions/sky cover
messages are emitted by the METAR station.
tornado/waterspout
thunder (in any form)
Ice / Snow/ Freezing / Sleet
Rain
Fog
Haze/Smoke/Dust/Volcano
cloud cover
*/
$Condstring = '
#
cond|tornado|32|32|Severe storm|
cond|thunder|31|17|Thunder storm|
cond|ice|23|23|Sleet|
cond|snow|25|16|Snow|
cond|freezing rain|23|23|FrzgRn|
cond|freezing drizzle|23|23|FrzgRn|
cond|freezing fog|6|11|FrzgFog|
cond|hail|23|23|Hail|
cond|heavy rain|8|12|Rain|
cond|light rain|22|15|Rain|
cond|showers|22|15|Showers|
cond|rain|20|14|Rain|
cond|fog|6|11|Fog|
cond|drizzle|22|15|Drizzle|
cond|mist|10|10|Mist|
cond|haze|7|7|Haze|
cond|dust|7|7|Dust|
cond|smoke|7|7|Smoke|
cond|volcanic|7|7|Volcanic Ash|
cond|sand|7|7|Sand|
cond|overcast|18|18|Overcast|
cond|mostly cloudy|2|4|Mostly Cloudy|
cond|partly cloudy|19|4|Partly Cloudy|
cond|few clouds|9|4|Few Clouds|
cond|clear|0|1|Clear|
cond|cloud|19|4|Variable Clouds|
#
';
$config = explode("\n",$Condstring);
foreach ($config as $key => $rec) { // load the parser condition strings
$recin = trim($rec);
if ($recin and substr($recin,0,1) <> '#') { // got a non comment record
list($type,$keyword,$dayicon,$nighticon,$condition) = explode('|',$recin . '|||||');
if (isset($type) and strtolower($type) == 'cond' and isset($condition)) {
$Conditions["$keyword"] = "$dayicon\t$nighticon\t$condition";
// $Debig .= "<!-- '$keyword'='$dayicon','$nighticon' '$condition' -->\n";
}
} // end if not comment or blank
} // end loading of loop over config recs
return;
}
// ------------------------------------------------------------------
function mtr_get_iconnumber ($time,$condString,$sunrise,$sunset) {
// Many thanks to Larry at Anole Computer for the basis of
// this routine.
// adapted by Ken True to be compatible with WD icon set
global $Icons, $IconsText, $Conditions, $Debug;
$Debug .= "<!-- mtr_get_iconnumber begin: '$time','$condString','$sunrise','$sunset' -->\n";
if(!preg_match('/^\d{1,2}:\d{2}[:\d{2}]{0,1}\s*[am|pm]*$/i',$sunrise)) { $sunrise = ''; }
if(!preg_match('/^\d{1,2}:\d{2}[:\d{2}]{0,1}\s*[am|pm]*$/i',$sunset)) { $sunset = ''; }
$sunrise2 = mtr_fixupTime(($sunrise<>'')?"$sunrise":"6:00a");
$sunset2 = mtr_fixupTime(($sunset<>'')?"$sunset":"7:00p");
$time2 = mtr_fixupTime(($time<>'')?"$time":date("H:i",time()));
if ($time2 >= $sunrise2 and $time2 <= $sunset2) {
$daynight = 'day';
} // end if
else {
$daynight = 'night';
} // end else
$Debug .= "<!-- mtr_get_iconnumber using: time2='$time2' as $daynight for sunrise2='$sunrise2',sunset2='$sunset2' -->\n";
$condString = trim($condString);
reset($Conditions); // Do search in load order
$iconnumb = 5; // default is a sunny icon
// scan over the conditions table and see if an icon fits the description in the table
foreach ($Conditions as $cond => $condrec) { // look for matching condition
if(preg_match("!$cond!i",$condString,$mtemp)) {
list($dayicon,$nighticon,$condition) = explode("\t",$condrec);
if (preg_match('|night|i',$daynight)) {
$iconnumb = $nighticon;
} else {
$iconnumb = $dayicon;
}
break;
}
} // end of conditions search
return $iconnumb;
}
// ------------------------------------------------------------------
function mtr_fixupTime ($intime) {
global $Debug;
$tfixed = preg_replace('/\s+([AM|PM])/i',"$1",$intime);
$tfixed = preg_replace('/^(\S+)\s+(\S+)$/is',"$2",$tfixed);
$t = explode(':',$tfixed);
if (preg_match('/p/i',$tfixed)) { $t[0] = $t[0] + 12; }
if ($t[0] > 23) {$t[0] = 12; }
if (preg_match('/^12.*a/i',$tfixed)) { $t[0] = 0; }
if ($t[0] < '10') {$t[0] = sprintf("%02d",$t[0]); } // leading zero on hour.
$t2 = join(':',$t); // put time back to gether;
$t2 = preg_replace('/[^\d\:]/is','',$t2); // strip out the am/pm if any
$Debug .= "<!-- mtr_fixupTime in='$intime' tfixed='$tfixed' out='$t2' -->\n";
return($t2);
}
// ---------------------------------------------------------
function mtr_process($metar,$icao) {
global $lang,$Debug, $mtrInfo, $metarPtr, $group,$UOMS;
$Debug .= "<!-- called mtr_process -->\n";
$Debug .= "<!-- UOMS\n".print_r($UOMS,true)." -->\n";
// This function directs the examination of each group of the METAR. The problem
// with a METAR is that not all the groups have to be there. Some groups could be
// missing. Fortunately, the groups must be in a specific order. (This function
// also assumes that a METAR is well-formed, that is, no typographical mistakes.)
// This function uses a function variable to organize the sequence in which to
// decode each group. Each function checks to see if it can decode the current
// METAR part. If not, then the group pointer is advanced for the next function
// to try. If yes, the function decodes that part of the METAR and advances the
// METAR pointer and group pointer. (If the function can be called again to
// decode similar information, then the group pointer does not get advanced.)
// This function was modified by Ken True - [email protected] to
// work with the template sets.
$lang = 'en';
foreach ($mtrInfo as $i => $value) { // clear out prior contents
unset($mtrInfo[$i]);
// $mtrInfo[$i] = '';
}
// $Debug .= "<!-- wxInfo cleared\n" . print_r($mtrInfo,true) . " -->\n";
$mtrInfo['STATION'] = $icao;
$mtrInfo['METAR'] = $metar;
if ($metar != '') {
$metarParts = explode(' ',$metar);
$groupName = array('mtr_get_station',
'mtr_get_time',
'mtr_get_station_type',
'mtr_get_wind',
'mtr_get_var_wind',
'mtr_get_visibility',
'mtr_get_runway',
'mtr_get_conditions',
'mtr_get_cloud_cover',
'mtr_get_temperature',
'mtr_get_altimeter');
$metarPtr = 3; // mtr_get_station identity is ignored
$group = 1; // start with Time
while ($group < count($groupName)) {
$part = $metarParts[$metarPtr];
$Debug .= "<!-- calling '" . $groupName[$group] . "' part='$part' ptr=$metarPtr grp=$group -->\n";
$groupName[$group]($part); // $groupName is a function variable
}
} else {
$mtrInfo['ERROR'] = 'Data not available';
}
$Debug .= "<!-- decode for $icao in mtrInfo is\n".print_r($mtrInfo,true)." -->\n";
}
//----------------------------------------------------------------
// Ignore station code. Script assumes this matches requesting
// $station. This function is never called. It is here for
// completeness of documentation.
function mtr_get_station($part)
{ global $lang,$Debug, $mtrInfo, $metarPtr, $group;
if (strlen($part) == 4 and $group == 0)
{
$group++;
$metarPtr++;
}
}
function mtr_get_time($part)
{ global $lang,$Debug, $mtrInfo, $metarPtr, $group;
// Ignore observation time. This information is found in the
// first line of the NWS file.
// Format is ddhhmmZ where dd = day, hh = hours, mm = minutes
// in UTC time.
if (substr($part,-1) == 'Z') {
$dd = substr($part,0,2);
$hh = substr($part,2,2);
$mm = substr($part,4,2);
$metarPtr++;
}
$group++;
}
function mtr_get_station_type($part)
{ global $lang,$Debug, $mtrInfo, $metarPtr, $group;
// Ignore station type if present.
if ($part == 'AUTO' || $part == 'COR')
$metarPtr++;
$group++;
}
function mtr_speed($part, $unit)
{
global $lang,$Debug, $mtrInfo, $metarPtr, $group, $UOMS;
// Convert wind speed into miles per hour.
// Some other common conversion factors (to 6 significant digits):
// 1 mi/hr = 1.15080 knots = 0.621371 km/hr = 2.23694 m/s
// 1 ft/s = 1.68781 knots = 0.911344 km/hr = 3.28084 m/s
// 1 knot = 0.539957 km/hr = 1.94384 m/s
// 1 km/hr = 1.852 knots = 3.6 m/s
// 1 m/s = 0.514444 knots = 0.277778 km/s
if ($unit == 'KT')
$speed = 1.1508 * $part; // from knots
elseif ($unit == 'MPS')
$speed = 2.23694 * $part; // from meters per second
else
$speed = 0.621371 * $part; // from km per hour
$speedkph = $speed / 0.621371;
if (preg_match('|mph|i',$UOMS['WIND']))
$speed ="" . round($speed) . " mph (". round($speedkph) . " km/h)";
else
$speed = "" . round($speedkph) . " km/h";
return $speed;
}
//-------------------------------------------------------------------------
// Decodes wind direction and speed information.
// Format is dddssKT where ddd = degrees from North, ss = speed,
// KT for knots or dddssGggKT where G stands for gust and gg = gust
// speed. (ss or gg can be a 3-digit number.)
// KT can be replaced with MPH for meters per second or KMH for
//kilometers per hour.
function mtr_get_wind($part)
{ global $lang,$Debug, $mtrInfo, $metarPtr, $group;
if (preg_match('/^([0-9G]{5,10}|VRB[0-9G]{2,7})(KT|MPS|KMH)$/',$part,$pieces))
{
$part = $pieces[1];
$unit = $pieces[2];
if ($part == '00000')
{
$mtrInfo['WIND'] = 'calm'; // no wind
}
else
{
preg_match('/([0-9]{3}|VRB)([0-9]{2,3})G?([0-9]{2,3})?/',$part,$pieces);
if ($pieces[1] == 'VRB')
$direction = 'varies';
else
{
$angle = (integer) $pieces[1];
$compass = array('N','NNE','NE','ENE','E','ESE','SE','SSE',
'S','SSW','SW','WSW','W','WNW','NW','NNW');
$direction = $compass[round($angle / 22.5) % 16];
}
if (!isset($pieces[3]) or (isset($pieces[3]) and $pieces[3] == 0 ) ) {
$gust = '';
} else {
$gust = ', gusting to ' . mtr_speed($pieces[3], $unit);
}
if ($unit == 'KT') {
$speed = 1.1508 * $pieces[2]; // from knots
} elseif ($unit == 'MPS') {
$speed = 2.23694 * $pieces[2]; // from meters per second
} else {
$speed = 0.621371 * $pieces[2]; // from km per hour
}
$mtrInfo['WINDMPH'] = $direction . ' at ' . round($speed) . ' mph';
$mtrInfo['WIND'] = $direction . ' at ' . mtr_speed($pieces[2], $unit) . $gust;
}
$metarPtr++;
}
$group++;
}
function mtr_get_var_wind($part)
{ global $lang,$Debug, $mtrInfo, $metarPtr, $group;
// Ignore variable wind direction information if present.
// Format is fffVttt where V stands for varies from fff
// degrees to ttt degrees.
if (preg_match('/([0-9]{3})V([0-9]{3})/',$part,$pieces))
$metarPtr++;
$group++;
}
//------------------------------------------------------------------
// Decodes visibility information. This function will be called a
// second time if visibility is limited to an integer mile plus a
// fraction part.
// Format is mmSM for mm = statute miles, or m n/dSM for m = mile
// and n/d = fraction of a mile, or just a 4-digit number nnnn (with
// leading zeros) for nnnn = meters.
function mtr_get_visibility($part) {
global $lang,$Debug, $mtrInfo, $metarPtr, $group, $UOMS;
static $integerMile = '';
if (strlen($part) == 1)
{
// visibility is limited to a whole mile plus a fraction part
$integerMile = $part . ' ';
$metarPtr++;
}
elseif (preg_match('|^\d{4}$|',$part)) {
// international code for meters of visibility
$kmVis = round($part/1000);
$miVis = round($part/1609);
if ($miVis > 1) {$unit = ' miles';} else {$unit = ' mile';}
if (preg_match('|mph|i',$UOMS['WIND'])) {
$mtrInfo['VISIBILITY'] = " $miVis $unit ($kmVis km)";
} else {
$mtrInfo['VISIBILITY'] = "$kmVis km";
}
$integerMile = '';
$metarPtr++;
$group++;
}
elseif (substr($part,-2) == 'SM')
{
// visibility is in miles
$part = substr($part,0,strlen($part)-2);
if (substr($part,0,1) == 'M')
{
$prefix = 'less than ';
$part = substr($part, 1);
}
else
$prefix = '';
if (preg_match('|mph|i',$UOMS['WIND']))
{
if (($integerMile == '' && preg_match('![/]!',$part,$pieces)) || $part == '1')
$unit = ' mile';
else
$unit = ' miles';
}
$kmVis = round( $part * 1.6 );
if (preg_match('|mph|i',$UOMS['WIND']))
$mtrInfo['VISIBILITY'] = $prefix . $integerMile .
" $part $unit ($kmVis km)";
else
$mtrInfo['VISIBILITY'] = "$kmVis km";
$integerMile = '';
$metarPtr++;
$group++;
}
elseif (substr($part,-2) == 'KM')
{
// unknown (Reported by NFFN in Fiji)
$integerMile = '';
$metarPtr++;
$group++;
}
elseif (preg_match('/^([0-9]{4})/',$part,$pieces))
{
// visibility is in meters
$distance = round($part/ 621.4, 1); // convert to miles
if ($distance > 5)
$distance = round($distance);
if ($distance <= 1)
$unit = ' mile';
else
$unit = ' miles';
$mtrInfo['VISIBILITY'] = $distance . $unit;
$integerMile = '';
$metarPtr++;
$group++;
}
elseif ($part == 'CAVOK')
{
// good weather
if (preg_match('|mph|i',$UOMS['WIND'])) {
$mtrInfo['VISIBILITY'] = 'greater than 7 miles (10 km)'; // or 10 km
} else {