Class: Kanrisuru::Util::Bits

Inherits:
Object
  • Object
show all
Defined in:
lib/kanrisuru/util/bits.rb

Class Method Summary collapse

Class Method Details

.convert_bytes(value, from, to) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 45

def self.convert_bytes(value, from, to)
  from = from.downcase.to_sym
  to   = to.downcase.to_sym

  byte_translations = {
    b: :deca,
    kb: :kilo,
    mb: :mega,
    gb: :giga,
    tb: :tera,
    pb: :peta,
    byte: :deca,
    kilobyte: :kilo,
    megabyte: :mega,
    gigabyte: :giga,
    terabyte: :tera,
    petabyte: :peta
  }

  bit_translations = {
    kib: :kilo,
    mib: :mega,
    gib: :giga,
    tib: :tera,
    pib: :peta,
    bit: :deca,
    kilobit: :kilo,
    megabit: :mega,
    gigabit: :giga,
    terabit: :tera,
    petabit: :peta
  }

  bit_translation_from = false
  bit_translation_to   = false

  from =
    if bit_translations.key?(from)
      bit_translation_from = true
      bit_translations[from]
    elsif byte_translations.key?(from)
      byte_translations[from]
    else
      raise ArgumentError, 'Invalid data type'
    end

  to =
    if bit_translations.key?(to)
      bit_translation_to = true
      bit_translations[to]
    elsif byte_translations.key?(to)
      byte_translations[to]
    else
      raise ArgumentError, 'Invalid data type'
    end

  multiplier = if bit_translation_from && !bit_translation_to
                 (1.to_f / 8).to_f
               elsif !bit_translation_from && bit_translation_to
                 8
               else
                 1
               end

  power = convert_power(from, to)

  (value * 1000.pow(power).to_f) * multiplier
end

.convert_from_gb(value, metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 33

def self.convert_from_gb(value, metric)
  convert_bytes(value, :gigabyte, metric)
end

.convert_from_kb(value, metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 25

def self.convert_from_kb(value, metric)
  convert_bytes(value, :kilobyte, metric)
end

.convert_from_mb(value, metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 29

def self.convert_from_mb(value, metric)
  convert_bytes(value, :megabyte, metric)
end

.convert_from_pb(value, metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 41

def self.convert_from_pb(value, metric)
  convert_bytes(value, :petabyte, metric)
end

.convert_from_tb(value, metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 37

def self.convert_from_tb(value, metric)
  convert_bytes(value, :terabyte, metric)
end

.convert_power(from_metric, to_metric) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 114

def self.convert_power(from_metric, to_metric)
  @conversions ||= {
    deca: {
      deca: 0,
      kilo: -1,
      mega: -2,
      giga: -3,
      tera: -4,
      peta: -5,
      exa: -6,
      zetta: -7,
      yotta: -8
    },
    kilo: {
      deca: 1,
      kilo: 0,
      mega: -1,
      giga: -2,
      tera: -3,
      peta: -4,
      exa: -5,
      zetta: -6,
      yotta: -7
    },
    mega: {
      deca: 2,
      kilo: 1,
      mega: 0,
      giga: -1,
      tera: -2,
      peta: -3,
      exa: -4,
      zetta: -5,
      yotta: -6
    },
    giga: {
      deca: 3,
      kilo: 2,
      mega: 1,
      giga: 0,
      tera: -1,
      peta: -2,
      exa: -3,
      zetta: -4,
      yotta: -5
    },
    tera: {
      deca: 4,
      kilo: 3,
      mega: 2,
      giga: 1,
      tera: 0,
      peta: -1,
      exa: -2,
      zetta: -3,
      yotta: -4
    },
    peta: {
      deca: 5,
      kilo: 4,
      mega: 3,
      giga: 2,
      tera: 1,
      peta: 0,
      exa: -1,
      zetta: -2,
      yotta: -3
    },
    exa: {
      deca: 6,
      kilo: 5,
      mega: 4,
      giga: 3,
      tera: 2,
      peta: 1,
      exa: 0,
      zetta: -1,
      yotta: -2
    },
    zetta: {
      deca: 7,
      kilo: 6,
      mega: 5,
      giga: 4,
      tera: 3,
      peta: 2,
      exa: 1,
      zetta: 0,
      yotta: -1
    },
    yotta: {
      deca: 8,
      kilo: 7,
      mega: 6,
      giga: 5,
      tera: 4,
      peta: 3,
      exa: 2,
      zetta: 1,
      yotta: 0
    }
  }

  values = @conversions[from_metric]
  values ? values[to_metric] : nil
end

.normalize_size(string) ⇒ Object 



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# File 'lib/kanrisuru/util/bits.rb', line 6

def self.normalize_size(string)
  size, unit = string.split
  size = size.to_f
  unit ||= 'b'

  return 0 if size.zero?

  case unit.downcase
  when 'b'
    Kanrisuru::Util::Bits.convert_bytes(size, :byte, :kilobyte)
  when 'kb', 'k', 'kib'
    size
  when 'mb', 'm', 'mib'
    Kanrisuru::Util::Bits.convert_from_mb(size, :kilobyte).to_i
  when 'gb', 'g', 'gib'
    Kanrisuru::Util::Bits.convert_from_gb(size, :kilobyte).to_i
  end
end