Class: CArray::Serializer

Inherits:
Object show all
Defined in:
lib/carray/serialize.rb

Overview

:nodoc:

Constant Summary collapse

Header = 
CA.struct(:pack=>1, :size=>256) {
  char_p    :magic_string,   :bytes=>8
  char_p    :data_type_name, :bytes=>8
  char_p    :endian,         :bytes=>4
  int32     :data_type
  int64     :bytes
  int32     :ndim
  int64     :elements
  int32     :has_mask
  array     :dim,            :type => CArray.int64(CA_RANK_MAX)
  int32     :has_attr
}
Header_Legacy = 
CA.struct(:pack=>1, :size=>256) {
  char_p    :magic_string,   :bytes=>8
  char_p    :data_type_name, :bytes=>8
  char_p    :endian,         :bytes=>4
  int32     :data_type
  int32     :bytes
  int32     :ndim
  int32     :elements
  int32     :has_mask
  array     :dim,            :type => CArray.int32(CA_RANK_MAX)
  int32     :has_attr
}

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ Serializer

Returns a new instance of Serializer.



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# File 'lib/carray/serialize.rb', line 77

def initialize (io)
  case io
  when String
    @io = StringIO.new(io)
  else
    @io = io
  end
end

Instance Method Details

#load(opt = {}, legacy: false) ⇒ Object 



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# File 'lib/carray/serialize.rb', line 130

def load (opt = {}, legacy: false)
  if legacy
    header = Header_Legacy.decode(@io.read(256))
  else
    header = Header.decode(@io.read(256))
  end
  if header[:magic_string] != "_CARRAY_"
    raise "not a CArray binary data"      
  end
  case header[:endian]
  when "_LE_"
    endian = CA_LITTLE_ENDIAN
  when "_BE_"
    endian = CA_BIG_ENDIAN
  end
  unless CArray.endian == endian
    header.swap_bytes!
  end
  data_type = header[:data_type]
  bytes     = header[:bytes]
  ndim      = header[:ndim]
  elements  = header[:elements]
  has_mask  = header[:has_mask] != 0 ? true : false
  dim       = header[:dim][[0, ndim]].to_a
  has_attr  = header[:has_attr]
  if data_type == 255
    data_type = header[:data_type_name].strip.to_sym
  end
  data_type, bytes = CArray.guess_type_and_bytes(data_type, bytes)
  if opt[:data_type] and data_type == CA_FIXLEN
    data_type = opt[:data_type]
  end
  ca = CArray.new(data_type, dim, :bytes=>bytes)
  if data_type == CA_OBJECT
    ca.value[] = Marshal.load(@io)
  else
    ca.load_binary(@io)
    unless CArray.endian == endian
      ca.swap_bytes!
    end
  end
  if has_mask
    ca.mask = 0
    ca.mask.load_binary(@io)
  end
  if has_attr == 1
    ca.attribute = Marshal.load(@io)
  end
  return ca
end

#save(ca, opt = {}) ⇒ Object 



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# File 'lib/carray/serialize.rb', line 86

def save (ca, opt = {})
  endian = opt[:endian] || CArray.endian
  # ---
  header = Header.new()
  header[:magic_string]   = "_CARRAY_"
  header[:data_type_name] = ca.data_type_name.ljust(8)
  header[:endian]         = ( endian == CA_LITTLE_ENDIAN ) ? "_LE_" : "_BE_"
  header[:data_type]      = ca.data_type
  header[:bytes]          = ca.bytes
  header[:ndim]           = ca.ndim
  header[:elements]       = ca.elements
  header[:has_mask]       = ca.has_mask? ? 1 : 0
  header[:dim][[0,ca.ndim]] = ca.dim
  attr = nil
  if ca.attribute
    attr = ca.attribute.clone
  end
  if opt[:attribute]
    (attr ||= {}).update(opt[:attribute])
  end
  header[:has_attr]       = attr.empty? ? 0 : 1
  unless CArray.endian == endian
    header.swap_bytes!
  end
  @io.write(header.encode)
  # ---
  if ca.data_type == CA_OBJECT
    Marshal.dump(ca.value.to_a, @io)
  else
    unless CArray.endian == endian
      ca = ca.swap_bytes
    end
    ca.dump_binary(@io)
  end
  # ---
  if ca.has_mask?
    ca.mask.dump_binary(@io)
  end
  if attr
    Marshal.dump(attr, @io)
  end
  return ca
end