Supporting bit decoding and encoding

[Fryguy]

I'd like to specify the following:

BinaryStruct.decode([
  'L', :some_num,
  'b', :flag1,
  'b', :flag2,
  'b', :flag3,
  'L', :another_num,
])

Given that, I'd expect BinaryStruct.decode to extract a number, then on the next byte extract the first 3 bits as booleans stored in :flag1, :flag2, :flag3, then move ahead to the next byte and extract another number.

I'd probably be happy with having to align my definition to byte boundaries, so perhaps...

BinaryStruct.decode([
  'L', :some_num,
  'b', :flag1,
  'b', :flag2,
  'b', :flag3,
  'b5', :unused, # ideally optional
  'L', :another_num,
])

I would expect encode and size to handle similar structures.

---

Implementation wise, the 'b' identifier reads 1 bit then skips to the next byte, So, when building the decode string it will have to be aware of successive bits and then pack those into a b8.

[miq-bot]

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