Class: Ext3::BlockPointersPath

Inherits:
Object
  • Object
show all
Defined in:
lib/fs/ext3/block_pointers_path.rb

Constant Summary collapse

DIRECT_SIZE = 
12
SINGLE_INDIRECT_INDEX = 
12
DOUBLE_INDIRECT_INDEX = 
13
TRIPLE_INDIRECT_INDEX = 
14
INDEX_TYPES = 
[:direct, :single_indirect, :double_indirect, :triple_indirect]

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(num_indirects, block = 0) ⇒ BlockPointersPath

Returns a new instance of BlockPointersPath.



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# File 'lib/fs/ext3/block_pointers_path.rb', line 12

def initialize(num_indirects, block = 0)
  @num_indirects = num_indirects
  @single_indirect_size = @num_indirects
  @double_indirect_size = @num_indirects**2
  @triple_indirect_size = @num_indirects**3

  @single_indirect_base_size = DIRECT_SIZE
  @double_indirect_base_size = DIRECT_SIZE + @single_indirect_size
  @triple_indirect_base_size = DIRECT_SIZE + @single_indirect_size + @double_indirect_size

  self.block = block
end

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block.



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# File 'lib/fs/ext3/block_pointers_path.rb', line 10

def block
  @block
end

#num_indirects ⇒ Object (readonly)

Returns the value of attribute num_indirects.



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# File 'lib/fs/ext3/block_pointers_path.rb', line 10

def num_indirects
  @num_indirects
end

#path ⇒ Object (readonly)

Returns the value of attribute path.



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# File 'lib/fs/ext3/block_pointers_path.rb', line 10

def path
  @path
end

#path_index ⇒ Object (readonly)

Returns the value of attribute path_index.



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# File 'lib/fs/ext3/block_pointers_path.rb', line 10

def path_index
  @path_index
end

Instance Method Details

#direct? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/ext3/block_pointers_path.rb', line 35

def direct?;          @path_index == 0; end

#direct_index ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 25

def direct_index;          @path[0]; end

#double_indirect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/ext3/block_pointers_path.rb', line 39

def double_indirect?; @path_index == 2; end

#double_indirect_index ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 29

def double_indirect_index; @path[2]; end

#index_type ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 33

def index_type; INDEX_TYPES[@path_index]; end

#single_indirect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/ext3/block_pointers_path.rb', line 37

def single_indirect?; @path_index == 1; end

#single_indirect_index ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 27

def single_indirect_index; @path[1]; end

#succ! ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 48

def succ!
  succ_index(@path_index)
  @block += 1
  self
end

#to_a ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 58

def to_a
  @path.dup
end

#to_s ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 54

def to_s
  @path.inspect
end

#triple_indirect? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fs/ext3/block_pointers_path.rb', line 41

def triple_indirect?; @path_index == 3; end

#triple_indirect_index ⇒ Object 



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# File 'lib/fs/ext3/block_pointers_path.rb', line 31

def triple_indirect_index; @path[3]; end