The index root contains the top level nodes of an index tree. See the
directory overview for a description of its purpose.
At offset 20 of the data (or 40 of the attribute), the list of
entries begins. The layout of the index header
is
offset(length) Description
0(4) always 0x30. Indexed attribute?
4(4) always 1. ???
8(4) Size of index record ???
C(4) Number of clusters per index record ???
10(4) always 0x10. ???
14(4) Size of entries +0x10
18(4) same value as 14
1C(2) 1 if index allocation used.
1E(2) Flags ???