module Bagua

Provides encoding and decoding functions for trigrams and hexagrams.

Constants

VERSION

Public Class Methods

bytes_to_ntets(bytes, n) click to toggle source

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

# 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) click to toggle source

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

# 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