Code Generation from Tag

• If binary tag is .t1t2t3... = (r-l)/2 in [l,r) then we want to choose k to form the code t1t2...tk.

• Short code:

  • choose k to be as small as possible so that l < .t1t2...tk000... < r.

• Guaranteed code:

  • choose
  • l < .t1t2...tkb1b2b3... < r for any bits b1b2b3...
  • for fixed length strings provides a good prefix code.
  • example: [.000000000..., .000010010...), tag = .000001001...Short code: 0Guaranteed code: 000001

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