On Sat, Jul 13, 2013 at 12:26 AM, Thomas Gummerer <t.gummerer@xxxxxxxxx> wrote:
> +== Directory offsets (diroffsets)
> +
> + diroffset (32-bits): offset to the directory relative to the beginning
> + of the index file. There are ndir + 1 offsets in the diroffset table,
> + the last is pointing to the end of the last direntry. With this last
> + entry, we are able to replace the strlen of when reading the directory
strlen of what?
> + name, by calculating it from diroffset[n+1]-diroffset[n]-61. 61 is the
> + size of the directory data, which follows each each directory + the
> + crc sum + the NUL byte.
> +
> + This part is needed for making the directory entries bisectable and
> + thus allowing a binary search.
Just thinking out loud. Maybe this section and fileoffsets should be
made optional extensions. So far I see no use for them. It's nice for
a program to occasionally look at a single entry, but such programs do
not exist (yet). For inotify monitor that may want to update a single
file's stat, it could regenerate the index with {dir,file}offsets
extensions the first time it attempts to update the index, then it
could do bsearch.
--
Duy
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