/usr/share/xscreensaver/config/ccurve.xml is in xscreensaver-data-extra 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="ccurve" _label="CCurve">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Change image every" _low-label="0 seconds" _high-label="30 seconds"
low="0" high="30" default="3"/>
<number id="pause" type="slider" arg="-pause %"
_label="Animation speed" _low-label="Slow" _high-label="Fast"
low="0.0" high="5.0" default="0.4" convert="invert"/>
<number id="limit" type="slider" arg="-limit %"
_label="Density" _low-label="Low" _high-label="High"
low="3" high="300000" default="200000"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
Generates self-similar linear fractals, including the classic "C Curve".
http://en.wikipedia.org/wiki/Levy_C_curve
Written by Rick Campbell; 1999.
</_description>
</screensaver>
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