Class: Fields::HexstringField

Inherits:
Field show all
Defined in:
lib/fields.rb

Overview

For getting and setting via hex strings.

Instance Attribute Summary

Attributes inherited from Field

#bitstring, #default_value, #desc, #endianness, #length, #length_type, #name, #type

Instance Method Summary collapse

Methods inherited from Field

#parse_buffer, #parse_buffer_lazy, #parse_buffer_strict, #randomize!, #set_raw, #set_value, #to_s

Constructor Details

#initialize(*args) ⇒ HexstringField

Returns a new instance of HexstringField.



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# File 'lib/fields.rb', line 193

def initialize *args
    @length_type="variable"
    super
end

Instance Method Details

#get_value ⇒ Object 



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# File 'lib/fields.rb', line 210

def get_value
    return '' if @bitstring==""
    unless @bitstring.length > 8 && @bitstring.length % 8 == 0
        #do the best we can..
        hexstring=@bitstring.to_i(2).to_s(16)
        (hexstring.length % 2 == 1) && hexstring="0"+hexstring
    else
        hexstring=bitstring.scan(/.{8}/).map {|e| "%.2x" % e.to_i(2)}.join
    end
    hexstring
end

#input_to_bitstring(value) ⇒ Object 



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# File 'lib/fields.rb', line 198

def input_to_bitstring( value )
    if (value.respond_to? :to_int) and value >= 0
        bs=value.to_int.to_s(2)
    elsif (value.respond_to? :to_str) and value.to_str=~/^[a-f0-9\s]*$/
        bs=value.to_str.gsub(/\s/,'').to_i(16).to_s(2)
    else
        raise ArgumentError, "HexstringField (#{@name}): Unable to parse input value."
    end
    (bs.length % 8 != 0) && bs=("0"*(8-bs.length%8) + bs)
    bs
end