[Xastir] Crash when reading shapefile

[Jason Godfrey]

On Fri, Jun 19, 2009 at 10:20 PM, Tom Russo<russo at bogodyn.org> wrote:
>
> Not a known error.  The code is clearly *not* doing some error checking it
> should do (check for null pointer return from SHPReadObject before
> dereferencing it), but neither should SHPReadObject ever fail so long as you're
> accessing a shape number that's lower than the number in the file  ---  again,
> I suspect that the file is advertising more shapes than it actually contains.

Well, you were right about the last shape returning null:
Reading entity 0...  returned 0237cf20
Reading entity 1...  returned 0237cf20
Reading entity 2...  returned 0237cf20
Reading entity 3...  returned 0237cf20
Reading entity 4...  returned 0237cf20
ERROR 3: Error in fseek() or fread() reading object from .shp file.
Reading entity 5...  returned 00000000
Bus error


However, when I run shpdump on the shapefile, I get entries for entiy 5:
Shape:5 (Arc)  nVertices=36, nParts=1
  Bounds:(     -92.944,      46.011, 0, 0)
      to (     -92.879,      46.125, 0, 0)
     (     -92.879,      46.125, 0, 0) Ring
     (     -92.892,      46.125, 0, 0)
<and so on>

I'll poke around some more tomorrow.
- Jason


>
> --
> Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
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