lofi(7D) compression support PSARC/2007/569 FastTrack [restart]

[Alok Aggarwal]

On Wed, 10 Oct 2007, Darren J Moffat wrote:

> I believe I have one other question unanswered which is about the size of the 
> header/metadata.  It wasn't clear to me from the case material how big the 
> header area is - though this is less architectural and more personal 
> interest/lower level design review.

So, here are the sizes of the various fields mentioned
in materials/ondisk_format.png -

Signature - strlen(name_of_algorithm)
Segment Size - uint32_t (4 bytes)
No. of Segments - uint32_t (4 bytes)
Size of Last Segment - uint32_t (4 bytes)

This is followed by an "Index" where each index
entry is a uint64_t (8 bytes). The number of
index entries depends on the size of the file
in question and the segment size used to compress
that file.

Alok