[GRASS5] rasters?

[Hamish]

> I can only think of two changes:
> 
> 1. For compressed maps (integer or FP), the size of the row offsets is
> sizeof(off_t) rather than sizeof(long). The main consequence of this
> is that 8-byte offsets will now be more common, so if your code only
> handles 4-byte offsets, it will fail more often.

maybe why the segment lib is showing read() past end of file errors in
r.cost, r.walk, etc.
?
 
> 2. Integer maps can be compressed using either RLE or zlib. Maps which
> are compressed using zlib have a value of 2 in the "compressed" field
> of the cellhd file.


Hamish