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Made the NMEA parser more robust

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This commit is contained in:
Martin Tůma 2016-11-17 19:43:02 +01:00
parent 535361dada
commit a6053a4d7b
1 changed files with 34 additions and 7 deletions
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41
src/nmeaparser.cpp
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@ -5,18 +5,22 @@
static bool readTime(const char *data, int len, QTime &time)
{
int h, m, s ,ms;
int h, m, s, ms = 0;
if (len < 9)
if (len < 6)
return false;
h = str2int(data, 2);
m = str2int(data + 2, 2);
s = str2int(data + 4, 2);
ms = str2int(data + 7, len - 7);
if (h < 0 || m < 0 || s < 0 || ms < 0 || data[6] != '.')
if (h < 0 || m < 0 || s < 0)
return false;
if (len > 7 && data[6] == '.') {
if ((ms = str2int(data + 7, len - 7)) < 0)
return false;
}
time = QTime(h, m, s, ms);
if (!time.isValid())
return false;
@ -97,6 +101,22 @@ static bool readFloat(const char *data, int len, qreal &f)
return ok;
}
static bool validLine(const char *line, int len)
{
const char *lp;
if (len < 10 || line[0] != '$')
return false;
for (lp = line + len - 1; lp > line; lp--)
if (!::isspace(*lp))
break;
if (*(lp-2) != '*' || !::isalnum(*(lp-1)) || !::isalnum(*(lp)))
return false;
return true;
}
bool NMEAParser::readRMC(const char *line, int len)
{
int col = 1;
@ -394,9 +414,11 @@ bool NMEAParser::loadFile(QFile *file)
return false;
}
if (len < 7 || line[0] != '$') {
_errorString = "Format error";
return false;
if (!validLine(line, len)) {
fprintf(stderr, "%s:%d: Invalid NMEA sentence\n",
qPrintable(file->fileName()), _errorLine);
_errorLine++;
continue;
}
if (!memcmp(line + 3, "RMC,", 4)) {
@ -416,5 +438,10 @@ bool NMEAParser::loadFile(QFile *file)
_errorLine++;
}
if (!_tracks.last().size() && !_waypoints.size()) {
_errorString = "No usable NMEA sentence found";
return false;
}
return true;
}