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 193

def initialize(serializable, options = nil)
  @serializable = serializable
  @options = options ? options.dup : {}
  @current_address = 0
  @start_address = 0
  @current_byte = 0
  @current_bit = 0
end

Instance Attribute Details

#start_address ⇒ Object

Returns the value of attribute start_address.



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 191

def start_address
  @start_address
end

Instance Method Details

#align_data(attr_options, var) ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 230

def align_data( attr_options, var )
  # XXX: hay que sacar nest de acá
  if !attr_options[:type].in? [:bitfield, :bool, :nest]
    # Se posiciona al principio de un byte
    if self.current_bit != 0
      self.current_address = self.current_address.ceil
    end
    if @options[:align]==:dword
      # Si el dato es una palabra simple, alinea los datos en el siguiente byte par
      if var.bit_length > 8 and (self.current_address + self.start_address).modulo(2) != 0
        self.current_byte += 1
      end
      # Si el dato es una palabra doble, alinea los datos en la siguiente palabra par
      if var.bit_length > 16 and (self.current_address + self.start_address).modulo(4) != 0
        self.current_byte += 4-self.current_byte%4
      end
    elsif @options[:align]==:word
      # Si el dato es una palabra simple, alinea los datos en el siguiente byte par
      if var.bit_length > 8 and (self.current_address + self.start_address).modulo(2) != 0
        self.current_byte += 1
      end
    end
  end
end

#current_address ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 208

def current_address
  @current_address
end

#current_address=(value) ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 202

def current_address= (value)
  @current_address = value
  @current_byte = value.floor
  @current_bit = (value.modulo(1)*8).round
end

#current_bit ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 226

def current_bit
  @current_bit
end

#current_bit=(value) ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 221

def current_bit= (value)
  @current_bit = value
  @current_address = (@current_byte+@current_bit/8.0)
end

#current_byte ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 217

def current_byte
  @current_byte
end

#current_byte=(value) ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 212

def current_byte= (value)
  @current_byte = value
  @current_address = (@current_byte+@current_bit/8.0)
end

#dump ⇒ Object 



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 255

def dump
  serializable_values = @serializable.attributes
  self.start_address = @options[:start_address] || 0

  buffer = [] # Data Buffer
  tmp_buffer = [] # Aux Data Buffer

  self.current_address = self.start_address # Address in bytes

  @serializable.attr_config.each do |attr_options|
    attr_name = attr_options[:name]
    if attr_options[:type] != :nest
      var = attr_options[:coder].new(attr_options.merge(parent: @serializable))
      var.value = serializable_values[attr_name] rescue nil
    else
      var_value = serializable_values[attr_name].attributes rescue nil
      var = attr_options[:coder].new(var_value)
    end

    tmp_buffer = var.dump

    align_data(attr_options, var) if @options[:align]

    # Si los datos ocupan mas de un byte concatena los arrays
    if !attr_options[:type].in? [:bitfield, :bool] and @options[:align]
      buffer.insert(self.current_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+self.current_bit,'0')].pack('b*').unpack('C*')

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

    self.current_address += 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 297

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

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

  self.current_address = self.start_address # Dirección en bytes

  @serializable.attr_config.each do |attr_options|
    attr_name = attr_options[:name]

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

    align_data(attr_options, var) if @options[:align]

    # Si los datos ocupan mas de un byte, obtiene los bytes completos del buffer original
    if !attr_options[:type].in? [:bitfield, :bool] and @options[:align]
      result_deserialized=var.load(buffer.slice(self.current_byte, var.size))
    else # En caso de ser bits
      tmp_buffer = buffer.slice(self.current_byte, (var.size+self.current_bit/8.0).ceil)
      result_deserialized=var.load([tmp_buffer.pack('C*').unpack('b*').first.slice(self.current_bit,var.size*8)].pack('b*').unpack('C*'))
    end

    if attr_options[:type] == :nest
      serialized_values["#{attr_name}"] = result_deserialized
    else
      serialized_values["#{attr_name}"] = result_deserialized.count>1 ? result_deserialized : result_deserialized.first
    end
    self.current_address += var.size
  end

  # Asigno los datos leidos
  serialized_values.each do |k,v|
    @serializable.send("#{k}=", v)
  end
  @serializable
end

#size ⇒ Object

Return size of object in bytes



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# File 'lib/active_model_serializers_binary/active_model_serializers_binary.rb', line 337

def size
  serializable_values = @serializable.attributes
  self.start_address = @options[:start_address] || 0

  current_address = 0.0 # Dirección en bytes

  @serializable.attr_config.each do |attr_options|
    var = attr_options[:coder].new(attr_options.merge(parent: @serializable))

    align_data(attr_options, var) if @options[:align]

    self.current_address += var.size
  end
  self.current_address-self.start_address
end