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move loop terminatiion condition to the top and avoid potential infinite loop when if (content_length != shp.read_xdr_integer()) + Track empty shapes and don't create *.index when there is no non-empty geometries

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(#3184)
This commit is contained in:
artemp 2015-11-23 09:58:27 +00:00
parent 7aa97628e0
commit c32166c71f
1 changed files with 25 additions and 19 deletions
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44
utils/shapeindex/shapeindex.cpp
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@ -162,7 +162,7 @@ int main (int argc,char** argv)
mapnik::quad_tree<int> tree(extent, depth, ratio);
int count = 0;
while (true)
while (shx.is_good() && pos <= file_length + 4)
{
int offset = shx.read_xdr_integer();
int content_length = shx.read_xdr_integer();
@ -189,34 +189,40 @@ int main (int argc,char** argv)
{
shp.read_envelope(item_ext);
}
tree.insert(offset * 2,item_ext);
if (verbose)
{
std::clog << "record number " << record_number << " box=" << item_ext << std::endl;
}
++count;
if (pos >= file_length) break;
if (item_ext.valid())
{
tree.insert(offset * 2,item_ext);
++count;
}
}
std::clog << " number shapes=" << count << std::endl;
std::fstream file((shapename+".index").c_str(),
std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary);
if (!file)
if (count > 0)
{
std::clog << "cannot open index file for writing file \""
<< (shapename+".index") << "\"" << std::endl;
std::clog << " number shapes=" << count << std::endl;
std::fstream file((shapename+".index").c_str(),
std::ios::in | std::ios::out | std::ios::trunc | std::ios::binary);
if (!file)
{
std::clog << "cannot open index file for writing file \""
<< (shapename+".index") << "\"" << std::endl;
}
else
{
tree.trim();
std::clog << " number nodes=" << tree.count() << std::endl;
file.exceptions(std::ios::failbit | std::ios::badbit);
tree.write(file);
file.flush();
file.close();
}
}
else
{
tree.trim();
std::clog << " number nodes=" << tree.count() << std::endl;
file.exceptions(std::ios::failbit | std::ios::badbit);
tree.write(file);
file.flush();
file.close();
std::clog << "No non-empty geometries in shapefile" << std::endl;
}
}