Description: An entry in the filterStatement table.  Each entry
represents one of a sequence of statements that comprise
a filter.  Each filter statement consists of an index,
specific packet header fields, and arbitrary packet
offsets and values.

Some objects in this entry define ranges for specific packet
header fields.  These objects define comparison operations
on the field they share in the following manner:

  Low  High  Compare Method for field f
  ---  ----  -------------------------------------------
  0    0     no comparison on the field
  0    H     less than or equal to High    (f <= H)
  L    0     exact match                   (L == f)
  L    H     inclusive between comparison  (L <= f <= H)