Andreas Volz wrote: > Am Wed, 18 Apr 2007 20:52:51 +0200 schrieb Mateusz Loskot: > >> Andreas Volz wrote: >>> Hello, >>> >>> I've problems to parse WKB with GEOS. Here is my sample application: >>> [...] >>> It works in most cases, but sometimes the result values are broken >>> or I get a segfault. So I used valgrind to get some more >>> information. I got this as result: >>> >>> ==17755== Invalid read of size 4 >>> ==17755== at 0x41327FE: geos::PrecisionModel::makePrecise(double) >>> const (in /usr/lib/libgeos.so.2.2.3) ==17755== by 0x401D5D5A: ??? >>> ==17755== Address 0x460A544 is 4 bytes inside a block of size 16 >>> free'd ==17755== at 0x40212FA: operator delete(void*) >>> (in /usr/lib/valgrind/x86-linux/vgpreload_memcheck.so) ==17755== >>> by 0x4132695: geos::PrecisionModel::~PrecisionModel() >>> (in /usr/lib/libgeos.so.2.2.3) ==17755== by 0x42F083B: (below >>> main) (in /lib/libc-2.5.so) ==17755== >>> >>> ... and this as often as I read coordinates. >>> >>> Any ideas why PrecisionModel has this problem? A problem in GEOS >>> WKBParser or my application? >> Andreas, >> >> Could you provide us with simple but generic program presenting the >> problem? Ideally, if the example: >> - refers only to GEOS, but not to any database >> - shows values of coordinates causing the crash, just hardcoded in the >> program >> >> Your code is not usable, because it's specific to your particular >> environment and data. > > I've created an example without database access: > > http://tux-style.de/osm/tmp/proj_test.zip > > Makefile > proj_test.cpp > data.bin - Binary dump of a database line into a file > valgrind.txt - You see the problem only with valgrind (saved output) > > Tell me what else you need if I've not provided enough information.
Andreas, Thanks for the example. Could you tell me what version of GEOS do you use? I suppose it's line of GEOS 2.x because the example does not compile with 3.x. Am I correct? Cheers -- Mateusz Loskot http://mateusz.loskot.net _______________________________________________ geos-devel mailing list geos-devel@geos.refractions.net http://geos.refractions.net/mailman/listinfo/geos-devel
