Class: Torrenter::TorrentReader::PieceConstructor

Inherits:
Object
  • Object
show all
Defined in:
lib/torrenter/torrent_reader/piece_constructor.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(files, folder, sha_hashes, piece_length) ⇒ PieceConstructor

Returns a new instance of PieceConstructor.



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 6

def initialize(files, folder, sha_hashes, piece_length)
  @files        = files
  @folder       = folder
  @sha_hashes   = sha_hashes
  @piece_length = piece_length
  @index        = PieceIndex.new(piece_length)
end

Instance Attribute Details

#index ⇒ Object (readonly)

Returns the value of attribute index.



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 5

def index
  @index
end

Instance Method Details

#final_piece? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 18

def final_piece?
  index_length == @index.size + 1
end

#index_length ⇒ Object 



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 14

def index_length
  @sha_hashes.size / 20
end

#make_index ⇒ Object 



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 22

def make_index
  @piece = Piece.new(@piece_length)
  @files.each do |file|
    path = "#{@folder}/#{file['path'].join('/')}"
    offset = 0
    if @piece.tally != 0
      if @piece.left > file['length']
        @piece.add(0...file['length'], path)
      else
        offset = @piece.left
        @piece.add(0...@piece.left, path)
      end

      @index << @piece if @piece.full?
    else
      offset = 0
    end

    while offset < ((file['length']) - @piece_length)
      @piece = Piece.new(@piece_length)
      @piece.add(offset...(offset += @piece_length), path)
      @index << @piece if @piece.full?
    end

    if @piece.full? && offset > 0
      @piece = Piece.new(@piece_length)
      @piece.add(offset...file['length'], path)
    end

    if final_piece?
      @index << @piece
    end
  end
  set_hash
end

#piece_hash(n) ⇒ Object 



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 67

def piece_hash(n)
  @sha_hashes[(n * 20)...(n * 20) + 20]
end

#set_hash ⇒ Object 



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# File 'lib/torrenter/torrent_reader/piece_constructor.rb', line 58

def set_hash
  0.upto(@index.size - 1) do |i|
    @index[i].hash = piece_hash(i)
    @index[i].index = i
  end

  return @index
end