Class: FuzzBert::Mutator

Inherits:
Generator show all
Defined in:
lib/fuzzbert/mutator.rb

Instance Attribute Summary

Attributes inherited from Generator

#description

Instance Method Summary collapse

Methods inherited from Generator

#to_data

Methods included from Generation

#generator

Constructor Details

#initialize(value) ⇒ Mutator

Returns a new instance of Mutator.



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# File 'lib/fuzzbert/mutator.rb', line 4

def initialize(value)
  orig = value.dup
  orig.force_encoding(Encoding::BINARY)
  super("Mutator") do
    #select a byte
    i = FuzzBert::PRNG.rand(value.size)
    old = orig[i].ord
    #map a random value from 0..254 to 0..255 excluding the current value
    b = FuzzBert::PRNG.rand(255)
    b = b < old ? b : b + 1
    orig.dup.tap { |s| s.setbyte(i, b) }
  end
end