I am slightly confused about the overloaded use of the FIELDBASE
in association with the FT_BOOLEAN.
The README.developer says:
"For FT_BOOLEAN fields that are also bitfields, 'display' is used to tell
the proto_tree how wide the parent bitfield is. With integers this is
not needed since the type of integer itself (FT_UINT8, FT_UINT16,
FT_UINT24, FT_UINT32, etc.) tells the proto_tree how wide the parent
bitfield is."
Which leads me to believe that I can use the FIELDBASE and a mask
to extract my boolean from some appropriately sized unsigned int type.
It fails however to indicate which FIELDBASE values correspond
to which bitwidths.
This becomes even more confusing on investigating the source.
The base types are defined in proto.h as
enum {
BASE_NONE,
BASE_DEC,
BASE_HEX,
BASE_OCT,
BASE_BIN
};
which in my understanding of the universe is equivalent to
enum {
BASE_NONE = 0,
BASE_DEC = 1,
BASE_HEX = 2,
BASE_OCT = 3,
BASE_BIN = 4
};
since the only place I can find this overloaded use of the FIELDBASE
is in proto.c, where it is returned from hfinfo_bitwidth() which
returns the expected values of 8 for FT_UINT8, 16 for FT_UINT16, and
so on, but for FT_BOOLEAN simply returns:
case FT_BOOLEAN:
bitwidth = hfinfo->display; /* hacky? :) */
this would seem to mean that I can't back my FT_BOOLEANS with anything
bigger than a 4 bit wide value (the BASE_BIN case). I don't think this is
really the case. What am I misunderstanding?
Ed
