bindat-get-field is a compiled Lisp function in `bindat.el'.

(bindat-get-field STRUCT &rest FIELD)

In structured data STRUCT, return value of field named FIELD.
If multiple field names are specified, use the field names to
lookup nested sub-structures in STRUCT, corresponding to the
C-language syntax STRUCT.FIELD1.FIELD2.FIELD3...
An integer value in the field list is taken as an array index,
e.g. corresponding to STRUCT.FIELD1[INDEX2].FIELD3...