Module: Nibbler::TypeConversion

Extended by:
TypeConversion
Included in:
TypeConversion
Defined in:
lib/nibbler/type_conversion.rb

Overview

A helper for converting between different types of nibbles and bytes

Instance Method Summary collapse

Instance Method Details

#hex_chars_to_numeric_bytes(nibbles) ⇒ Array<Fixnum>

Converts an array of hex nibble strings to numeric bytes

Parameters:

  • nibbles (Array<String>)

Returns:

  • (Array<Fixnum>) 


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# File 'lib/nibbler/type_conversion.rb', line 11

def hex_chars_to_numeric_bytes(nibbles)
  nibbles = nibbles.dup
  # get rid of last nibble if there's an odd number
  # it will be processed later anyway
  nibbles.slice!(nibbles.length-2, 1) if nibbles.length.odd?
  bytes = []
  while !(nibs = nibbles.slice!(0,2)).empty?
    byte = (nibs[0].hex << 4) + nibs[1].hex
    bytes << byte
  end
  bytes
end

#hex_str_to_hex_chars(string) ⇒ Array<String>

Converts a string of hex digits to string nibbles

Parameters:

  • string (String)

Returns:

  • (Array<String>) 


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# File 'lib/nibbler/type_conversion.rb', line 27

def hex_str_to_hex_chars(string)
  string.split(//)    
end

#numeric_byte_to_hex_chars(num) ⇒ Array<String>

Converts a numeric byte to an array of hex nibble strings

Parameters:

  • num (Fixnum)

Returns:

  • (Array<String>) 


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# File 'lib/nibbler/type_conversion.rb', line 34

def numeric_byte_to_hex_chars(num)
  [((num & 0xF0) >> 4), (num & 0x0F)].map { |n| n.to_s(16) }      
end