Class: LFSR::Base

Inherits:

Object

• Object
• LFSR::Base

Defined in:

lib/lfsr.rb

Direct Known Subclasses

Pure::Size10, Pure::Size11, Pure::Size12, Pure::Size13, Pure::Size14, Pure::Size15, Pure::Size16, Pure::Size17, Pure::Size18, Pure::Size19, Pure::Size2, Pure::Size20, Pure::Size21, Pure::Size22, Pure::Size23, Pure::Size24, Pure::Size25, Pure::Size26, Pure::Size27, Pure::Size28, Pure::Size29, Pure::Size3, Pure::Size30, Pure::Size31, Pure::Size32, Pure::Size33, Pure::Size34, Pure::Size35, Pure::Size36, Pure::Size37, Pure::Size38, Pure::Size39, Pure::Size4, Pure::Size40, Pure::Size41, Pure::Size42, Pure::Size43, Pure::Size44, Pure::Size45, Pure::Size46, Pure::Size47, Pure::Size48, Pure::Size49, Pure::Size5, Pure::Size50, Pure::Size51, Pure::Size52, Pure::Size53, Pure::Size54, Pure::Size55, Pure::Size56, Pure::Size57, Pure::Size58, Pure::Size59, Pure::Size6, Pure::Size60, Pure::Size61, Pure::Size7, Pure::Size8, Pure::Size9

Instance Attribute Summary

• #max ⇒ Object

  Returns the value of attribute max.

• #reg ⇒ Object (also: #peek) readonly

  Returns the value of attribute reg.

• #seed ⇒ Object readonly

  Returns the value of attribute seed.

Instance Method Summary

• #initialize(max = nil, seed = nil) ⇒ Base constructor

  A new instance of Base.

• #reset(new_seed) ⇒ Object

Constructor Details

#initialize(max = nil, seed = nil) ⇒ Base

Returns a new instance of Base.

# File 'lib/lfsr.rb', line 9

def initialize(max = nil, seed = nil)
  # The C code depends on this being the first ivar to work properly.
  @reg = 1

  # This should be the second variable.
  @max = (max || self.class.const_get(:MASK) - 1) + 1

  reset seed
end

Instance Attribute Details

#max ⇒ Object

Returns the value of attribute max.

# File 'lib/lfsr.rb', line 6

def max
  @max
end

#reg ⇒ Object (readonly) Also known as: peek

Returns the value of attribute reg.

# File 'lib/lfsr.rb', line 5

def reg
  @reg
end

#seed ⇒ Object (readonly)

Returns the value of attribute seed.

# File 'lib/lfsr.rb', line 7

def seed
  @seed
end

Instance Method Details

#reset(new_seed) ⇒ Object

Raises:

• (ArgumentError)

# File 'lib/lfsr.rb', line 19

def reset(new_seed)
  @reg = @seed = (new_seed || Time.now.utc.to_i) & self.class.const_get(:MASK)
  raise ArgumentError, "The seed #{new_seed} is unacceptable for this register size" if new_seed && @reg == 0
  @reg = @seed = (new_seed || Time.now.utc.to_i) & self.class.const_get(:MASK) while @reg == 0
end