Class: ActiveModel::Serializers::Binary::Serializer

Inherits:
Object
  • Object
show all
Defined in:
lib/active_model_serializers_binary/active_model_serializers_binary.rb

Overview

:nodoc:

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(serializable, options = nil) ⇒ Serializer

Returns a new instance of Serializer.



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 77

def initialize(serializable, options = nil)
  @serializable = serializable
  @options = options ? options.dup : {}
end

Instance Attribute Details

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 75

def options
  @options
end

Instance Method Details

#dump ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 82

def dump
  serializable_values = @serializable.serializable_hash(options)
  start_address = @options[:start_address] || 0

  buffer = [] # Buffer en bytes
  tmp_buffer = [] # Buffer temporal en bytes
  current_address = start_address*2 + 0.0 # Dirección en bytes

  @serializable.attr_config.each do |key, options|
    var = options[:coder].new(options.merge(parent: @serializable))
    # Busca el valor del atributo y si no existe devuelve nil
    var.value = serializable_values[key] rescue nil

    byte = current_address.floor
    bit = (current_address.modulo(1)*8).round

    tmp_buffer = var.dump
    if @options[:align]
      if !var.type.in? [:bitfield, :bool]
        # Se posiciona al principio de un byte
        if bit != 0
          byte += 1
          bit = 0
          current_address = (byte+bit/8.0)
        end
        # Si el dato es una palabra simple, alinea los datos en el siguiente byte par
        if var.bit_length > 8 and current_address.modulo(2) != 0
          byte += 1
          bit = 0
        end
        # Si el dato es una palabra doble, alinea los datos en la siguiente palabra par
        if var.bit_length > 16 and (current_address + start_address*2).modulo(4) != 0
          byte += 4-byte%4
          bit = 0
        end
      end
    end

    # Si los datos ocupan mas de un byte concatena los arrays
    if !var.type.in? [:bitfield, :bool] and @options[:align]
      buffer.insert(byte, tmp_buffer).flatten!
    else # En caso de ser bits
      tmp_buffer.flatten!
      tmp_bits=tmp_buffer.pack('C*').unpack('b*').first.slice(0,var.size*8)
      tmp_buffer=[tmp_bits.rjust(tmp_bits.length+bit,'0')].pack('b*').unpack('C*')

      tmp_buffer.each_with_index do |v,i|
        buffer[byte+i] = (buffer[byte+i] || 0) | v
      end
    end

    current_address = (byte+bit/8.0)+var.size
  end
  buffer.map!{|el| el || 0}
end

#load(buffer = []) ⇒ Object

deserializado



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 139

def load (buffer=[])
  serialized_values = {}
  start_address = @options[:start_address] || 0

  buffer ||= [] # Buffer en bytes
  tmp_buffer = [] # Buffer temporal en bytes

  current_address = start_address*2 + 0.0 # Dirección en bytes

  @serializable.attr_config.each do |key, options|
    byte = current_address.floor
    bit = (current_address.modulo(1)*8).round

    var = options[:coder].new(options.merge(parent: @serializable)) #creo objeto del tipo de dato pasado

    if @options[:align]
      if !var.type.in? [:bitfield, :bool]
        # Se posiciona al principio de un byte
        if bit != 0
          byte += 1
          bit = 0
          current_address = (byte+bit/8.0)
        end
        # Si el dato es una palabra simple, alinea los datos en el siguiente byte par
        if var.bit_length > 8 and current_address.modulo(2) != 0
          byte += 1
          bit = 0
        end
        # Si el dato es una palabra doble, alinea los datos en la siguiente palabra par
        if var.bit_length > 16 and (current_address + start_address*2).modulo(4) != 0
          byte += 4-byte%4
          bit = 0
        end
      end
    end

    # Si los datos ocupan mas de un byte, obtiene los bytes completos del buffer original
    if var.bit_length >= 8 and @options[:align]
      result_deserialized=var.load(buffer.slice(byte, var.size))
    else # En caso de ser bits
      tmp_buffer = buffer.slice(byte, (var.size+bit/8.0).ceil)
      result_deserialized=var.load([tmp_buffer.pack('C*').unpack('b*').first.slice(bit,var.size*8)].pack('b*').unpack('C*'))
    end
    serialized_values["#{key}"] = result_deserialized.count>1 ? result_deserialized : result_deserialized.first
    current_address = (byte+bit/8.0)+var.size
  end

  # Asigno los datos leidos
  serialized_values.each do |k,v|
    if @serializable.respond_to? "#{k}="
      @serializable.send("#{k}=", v)
    else
      @serializable.instance_variable_set("@#{k}".to_sym, v)
    end
  end
  @serializable
end