bool
NOAADownloader::DownloadMETAR(const char *code, METAR &metar,
JobRunner &runner)
{
#ifndef NDEBUG
assert(strlen(code) == 4);
for (unsigned i = 0; i < 4; i++)
assert((code[i] >= 'A' && code[i] <= 'Z') ||
(code[i] >= '0' && code[i] <= '9'));
#endif
// Build file url
char url[256] = "http://weather.noaa.gov/pub/data/observations/metar/decoded/";
strcat(url, code);
strcat(url, ".TXT");
PathName path(url);
// Open download session
Net::Session session;
if (session.Error())
return false;
// Request the file
char buffer[4096];
Net::DownloadToBufferJob job(session, path, buffer, sizeof(buffer) - 1);
if (!runner.Run(job) || job.GetLength() < 0)
return false;
buffer[job.GetLength()] = 0;
/*
* Example:
*
* Duesseldorf, Germany (EDDL) 51-18N 006-46E 41M
* Sep 20, 2011 - 03:50 PM EDT / 2011.09.20 1950 UTC
* Wind: from the SW (220 degrees) at 10 MPH (9 KT):0
* Visibility: greater than 7 mile(s):0
* Sky conditions: mostly cloudy
* Temperature: 60 F (16 C)
* Dew Point: 51 F (11 C)
* Relative Humidity: 72%
* Pressure (altimeter): 30.21 in. Hg (1023 hPa)
* ob: EDDL 201950Z 22009KT 9999 FEW035 BKN038 16/11 Q1023 NOSIG
* cycle: 20
*/
char *p = buffer;
// Skip characters until line feed or string end
while (*p != '\n' && *p != 0)
p++;
if (*p == 0)
return false;
// Skip characters until slash or string end
while (*p != '/' && *p != 0)
p++;
if (*p == 0)
return false;
p++;
if (*p == 0 || !ParseDecodedDateTime(p, metar.last_update))
return false;
// Search for line feed followed by "ob:"
char *ob = strstr(p, "\nob:");
if (ob == NULL)
return false;
*ob = 0;
ob += 4;
while (*ob == ' ' && *ob != 0)
ob++;
p = ob;
// Skip characters until line feed or string end
while (*p != '\n' && *p != '\r' && *p != 0)
p++;
if (*p != 0)
*p = 0;
metar.content.clear();
AppendToContentString(ob, metar.content);
metar.decoded.clear();
AppendToContentString(buffer, metar.decoded);
// Trim the content strings
TrimRight(metar.content.buffer());
TrimRight(metar.decoded.buffer());
return true;
}
bool
NOAADownloader::DownloadTAF(const char *code, TAF &taf,
JobRunner &runner)
{
#ifndef NDEBUG
assert(strlen(code) == 4);
for (unsigned i = 0; i < 4; i++)
assert((code[i] >= 'A' && code[i] <= 'Z') ||
(code[i] >= '0' && code[i] <= '9'));
#endif
// Build file url
char url[256] = "http://weather.noaa.gov/pub/data/forecasts/taf/stations/";
strcat(url, code);
strcat(url, ".TXT");
PathName path(url);
// Open download session
Net::Session session;
if (session.Error())
return false;
// Request the file
char buffer[4096];
Net::DownloadToBufferJob job(session, path, buffer, sizeof(buffer) - 1);
if (!runner.Run(job) || job.GetLength() < 0)
return false;
buffer[job.GetLength()] = 0;
/*
* Example:
*
* 2011/07/01 12:27
* TAF EDDL 011100Z 0112/0218 32010KT 9999 SCT040
* TEMPO 0112/0119 4000 SHRA SCT030CB PROB30
* TEMPO 0112/0118 32015G30KT TSRA
* BECMG 0118/0121 32005KT PROB30
* TEMPO 0202/0207 BKN012
* BECMG 0210/0213 31010KT
*/
// Parse date and time of last update
const char *p = ParseDateTime(buffer, taf.last_update);
if (p == buffer)
return false;
// Skip characters until line feed or string end
while (*p != '\n' && *p != 0)
p++;
if (*p == 0)
return false;
// p is now at the first character after the line feed
p++;
if (*p == 0)
return false;
// Read rest of the response into the content string
taf.content.clear();
AppendToContentString(p, taf.content);
// Trim the content string
TrimRight(taf.content.buffer());
return true;
}
bool
NOAADownloader::DownloadMETAR(const char *code, METAR &metar,
JobRunner &runner)
{
#ifndef NDEBUG
assert(strlen(code) == 4);
for (unsigned i = 0; i < 4; i++)
assert(code[i] >= 'A' && code[i] <= 'Z');
#endif
// Build file url
char url[256] = "ftp://tgftp.nws.noaa.gov/data/observations/metar/stations/";
strcat(url, code);
strcat(url, ".TXT");
PathName path(url);
// Open download session
Net::Session session;
if (session.Error())
return false;
// Request the file
char buffer[4096];
Net::DownloadToBufferJob job(session, path, buffer, sizeof(buffer) - 1);
if (!runner.Run(job) || job.GetLength() < 0)
return false;
buffer[job.GetLength()] = 0;
/*
* Example:
*
* 2011/07/01 10:20
* EDDL 011020Z 31004KT 270V340 9999 SCT032TCU SCT050 17/09 Q1022 TEMPO SHRA
*/
// Parse date and time of last update
const char *p = ParseDateTime(buffer, metar.last_update);
if (p == buffer)
return false;
// Skip characters until line feed or string end
while (*p != '\n' && *p != 0)
p++;
if (*p == 0)
return false;
// p is now at the first character after the line feed
p++;
if (*p == 0)
return false;
// Read rest of the response into the content string
metar.content.clear();
AppendToContentString(p, metar.content);
// Trim the content string
TrimRight(metar.content.buffer());
return true;
}
