Hanno Becker d2f9f53f7f Add typedef's for MPS buffer size types
Most buffers that MPS deals with are small and representable
with integer types of width 16-bit or more.

For highly memory constrained systems, it is therefore a potential
for significant memory savings to use 16-bit types for buffer sizes
throughout MPS.

In prepraration for this, this commit introduces typdefs

```
   mbedtls_mps_size_t
   mbedtls_mps_stored_size_t
```

for buffer sizes in the MPS implementation and the MPS structures,
respectively.

So far, those MUST be defined as `size_t`: While an effort has been made
to write most of MPS code in terms of `mbedtls_mps_[stored_]size_t` in a
way that would allow narrower types, those aren't yet supported. Still,
we retain the typedefs in order to avoid unnecessary rewriting of a large
body of the MPS codebase.

Signed-off-by: Hanno Becker <hanno.becker@arm.com>
2021-03-29 14:19:32 +01:00
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