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Valentin Platzgummer
qgroundcontrol
Commits
1412cb1a
Commit
1412cb1a
authored
Jan 03, 2011
by
pixhawk
Browse files
Speeded up logfile compression from quadratic to near-linear complexity
parent
38941da9
Changes
1
Hide whitespace changes
Inline
Side-by-side
src/LogCompressor.cc
View file @
1412cb1a
...
...
@@ -125,7 +125,9 @@ void LogCompressor::run()
file
.
reset
();
QTextStream
data
(
&
file
);
int
linecounter
=
0
;
while
(
!
data
.
atEnd
())
{
quint64
lastTimeIndex
=
0
;
while
(
!
data
.
atEnd
())
{
linecounter
++
;
currentDataLine
=
linecounter
;
QString
line
=
data
.
readLine
();
...
...
@@ -140,7 +142,33 @@ void LogCompressor::run()
value
=
"NaN"
;
}
// Get matching output line
quint64
index
=
times
->
indexOf
(
time
);
// Constraining the search area might result in not finding a key,
// but it significantly reduces the time needed for the search
// setting a window of 1000 entries means that a 1 Hz data point
// can still be located
int
offsetLimit
=
200
;
quint64
offset
;
quint64
index
=
-
1
;
while
(
index
==
-
1
)
{
if
(
lastTimeIndex
>
offsetLimit
)
{
offset
=
lastTimeIndex
-
offsetLimit
;
}
else
{
offset
=
0
;
}
quint64
index
=
times
->
indexOf
(
time
,
offset
);
if
(
index
==
-
1
)
{
qDebug
()
<<
"INDEX NOT FOUND DURING LOGFILE PROCESSING, RESTARTING SEARCH"
;
// FIXME Reset and start without offset heuristic again
offsetLimit
+=
1000
;
}
}
lastTimeIndex
=
index
;
QString
outLine
=
outLines
->
at
(
index
);
QStringList
outParts
=
outLine
.
split
(
separator
);
// Replace measurement placeholder with current value
...
...
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