[Xastir] Crash when reading shapefile

[Tom Russo]

On Fri, Jun 19, 2009 at 11:47:50PM -0500, we recorded a bogon-computron collision of the <godfreja at gmail.com> flavor, containing:
> 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>

K.  So it's not that there's no shape 5.  But are there really 36 vertices in 
shape 5?  There's clearly *something* wrong here that is making the shape
read fail.

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236        http://kevan.org/brain.cgi?DDTNM
  In some cultures what I do would be considered normal. 
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