Problems writing rasters with NG Python on 64 bit machines

[Sam Gillingham]

in gdal_wrap.cpp, both _wrap_Dataset_WriteRaster and _wrap_Band_WriteRaster contain code like this:

PyString_AsStringAndSize(obj5, &arg7, ( Py_ssize_t*)&arg6 );

Where arg6 is an integer. On a 64 bit machine, int is 32 bits while a pointer is 64. So, this cast is not valid because they are different sizes. This may well work on a little endian machine, but on a big endian machine, the 'wrong' part of the pointer gets written to the int (which is zero) and the bindings fail to write anything.

A proposed workaround patch (against 1.4.2) is supplied.

This makes me wonder if using 'int' as a size is a good idea - what happens if I want to write a raster > 4GB?

Thanks,

Sam.

[Sam Gillingham]

Proposed 64 bit workaround

[warmerdam]

I'll take this since I have a convenient test environment for the ticket.

[warmerdam]

I have applied a variation of this patch in swig/include/python/typemaps_python.i.

Changes applied in trunk (r1712) and 1.4 branch (r1713).

I agree that use of int's does limit the size of chunks that can be written to 2GB but it is certainly possible to manipulate larger rasters in pieces.

[warmerdam]

Garr, it seems I botched this in 1.4 (r11951) and trunk (r11952).