Hi Quincey:
I am working my way through various tests of HDF 1.6 features, hoping that 1.8
docs will be ready (or ready to work on) when Im done. ;^)
At the moment, im seeing a chunked data variable whose btree has 0 entries. I
assume that it was never written, and I should return fill values? It may or
may not be notable thats its chunked size is equal to its dataspace size, and
its in an Aura file.
Quincey Koziol wrote:
Hi John,
On Jul 13, 2007, at 11:43 AM, John Caron wrote:
Hi Quincey:
I'm just starting to look at the H5Fsuper.c (its been a while since i
coded in C).
Meanwhile i have another question on a different topic:
The B-tree nodes I assume are sorted on the keys. Is this a simple
sort on the byte values, or something else? For example, are nodes of
chunked data sorted on chunk size, then filter mask, then chunk
offset? Or do you just use the chunk offset? When sorting the chunk
offset, can i assume you sort on offset for slowest dimension (0),
then offset for dimension 1, etc
Yes, the B-trees are sorted on the keys. It's not a simple sort on
the byte values though, each "class" of B-tree has a comparison
function. For chunks we sort only on chunk offset and it's as you
describe above: first on offset in the slowest dimension, then toward
the fastest dimension.
Quincey
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