module Datasizes

analyze_specification(spec) click to toggle source

Analyzes the given specification.

@param [String] spec specification @return [Array] amount (Integer) and magnitude

identifier (Symbol)

# File lib/datasizes.rb, line 105
def self.analyze_specification(spec)
    matches = spec.match(self::ANALYSER)
    
    if matches.nil?
        raise Datasizes::InvalidSpecification
    else
        size = matches[1].to_i 
        if not matches[2].nil?
            magnitude = matches[2].to_sym
        end
        
        return [size, magnitude]
    end
end

count_bytes(amount, magnitude = nil) click to toggle source

Counts bytes for given amount and magnitude.

@param [Integer] size size in bytes @param [Symbol, String] magnitude magnitude name @return [Integer] size in bytes

# File lib/datasizes.rb, line 53
def self.count_bytes(amount, magnitude = nil)
    magnitude = magnitude.to_sym if magnitude.kind_of? String
    magnitude = self::MAGNITUDES[magnitude]
    return amount * (1024 ** magnitude)
end

from_bytes(size) click to toggle source

Converts given size to nearest reasonable magnitude specification.

@param [Integer] size size in bytes @return [String] specification

# File lib/datasizes.rb, line 86
def self.from_bytes(size)
    self::MAGNITUDES.each_key do |magnitude|
        amount = self.count_bytes(1, magnitude)
        remain = size % amount
        
        if remain == 0
            return (size / amount).to_s + magnitude.to_s
        end
    end
end

to_bytes(spec) click to toggle source

Converts specification to bytes.

@param [String] spec @return [Integer] size in bytes

# File lib/datasizes.rb, line 40
def self.to_bytes(spec)
    amount, magnitude = self::analyze_specification(spec)
    return self.count_bytes(amount, magnitude)
end

to_magnitude(size, magnitude = nil) click to toggle source

Converts given size in bytes to given magnitude.

@param [Integer] size size in bytes @param [Symbol, String] magnitude magnitude name @return [String] specification

# File lib/datasizes.rb, line 67
def self.to_magnitude(size, magnitude = nil)
    magnitude = magnitude.to_sym if magnitude.kind_of? String
    factor = self::MAGNITUDES[magnitude]
    
    if factor.nil?
        raise Datasizes::InvalidMagnitude::new("Invalid magnitude '#{magnitude}'.")
    end
    
    (size / (1024 ** factor)).to_s + magnitude.to_s
end

Constants

Public Class Methods