C RGBA Tiled Read/Write Example

Hi all,

I'm trying to do a simple read/write of a tiled multi-resolution EXR file
using the C API, but the API doesn't seem to have interfaces for some of
the things that are done automatically by the C++ API (like calculating the
number of levels/tiles etc).

Please could someone point me in the right direction?  A simple example
that reads and writes a tiled EXR using the C API would be great if
available.

Cheers,
- Alex.

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