[osg-submissions] osgdb_shp plugin's XBaseParser may have a error

[ChaosWong]

Hi Robert,

i develop osg application under windows. when i was loading a .shp file, my 
application was crashed. after i tracked, i found i miss a .bdf file, so code 
was crashed here:

XBaseParser::XBaseParser(const std::string fileName):
    _valid(false)
{
    int fd = 0;
    if (fileName.empty() == false)
    {
#ifdef WIN32
        if( (fd = open( fileName.c_str(), O_RDONLY | O_BINARY )) <= 0 )
#else
        if( (fd = ::open( fileName.c_str(), O_RDONLY )) <= 0 )
#endif
        {
            perror( fileName.c_str() );
            if (fd) close( fd );
            return;
        }
    }
    
    _valid = parse(fd);
}
   

thanks very much, and sorry about my english!
chaoswong
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