Christopher Haster c2283a2753 Extended entry tag to support attributes ...

Zero attributes are actually supported at the moment, but this change
will allow entry attribute to be added in a backwards compatible manner.

Each dir entry is now prefixed with a 32 bit tag:
4b - entry type
4b - data structure
8b - entry len
8b - attribute len
8b - name len

A full entry on disk looks a bit like this:
[-  8 -|-  8 -|-  8 -|-  8 -|-- elen --|-- alen --|-- nlen --]
[ type | elen | alen | nlen |  entry   |  attrs   |   name   ]

The actually contents of the attributes section is a bit handwavey
until the first attributes are implemented, but to put plans in place:
Each attribute will be prefixed with only a byte that indicates the type
of attribute. Attributes should be sorted based on portability, since
unknown attributes will force attribute parsing to stop.

2017-07-18 02:09:35 -05:00

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