Module: Bagua

Defined in:
lib/bagua.rb,
lib/bagua/hex.rb,
lib/bagua/tri.rb,
lib/bagua/version.rb

Overview

Provides encoding and decoding functions for trigrams and hexagrams.

Defined Under Namespace

Classes: Hex, Tri

Constant Summary collapse

VERSION =

Version number of this module.

"0.1.1"

Class Method Summary collapse

Class Method Details

.bytes_to_ntets(bytes, n) ⇒ Object

Converts an array of bytes (integers representable in 8 bits) to an array of ntets (integers representable in n bits).



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# File 'lib/bagua.rb', line 10

def self.bytes_to_ntets(bytes, n)
  countn = 0
  current = 0
  ntets = []
  bytes.each do |byte|
    7.downto(0) do |b|
      bit = (byte >> b) & 1
      current = (current << 1) | bit
      countn = (countn + 1) % n
      if (countn == 0)
        ntets.push(current)
        current = 0
      end
    end
  end

  # handle leftover bits when n doesn't divide evenly into bytes.length*8
  if (countn > 0)
    current = current << (n - countn)
    ntets.push(current)
  end

  return ntets
end

.ntets_to_bytes(ntets, n) ⇒ Object

Converts an array of ntets (integers representable in n bits) to an array of bytes (integers representable in 8 bits).



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# File 'lib/bagua.rb', line 37

def self.ntets_to_bytes(ntets, n)
  count8 = 0
  current = 0
  bytes = []
  ntets.each do |ntet|
    (n - 1).downto(0) do |b|
      bit = (ntet >> b) & 1
      current = (current << 1) | bit
      count8 = (count8 + 1) % 8
      if (count8 == 0)
        bytes.push(current)
        current = 0
      end
    end
  end

  # handle leftover bits when 8 doesn't divide evenly into ntets.length*n
  if (count8 > 0)
    current = current << (8 - count8)
    bytes.push(current)
  end

  return bytes
end