Class: CBOR_DIAG::App_float

Inherits:
Object show all
Defined in:
lib/cbor-diagnostic-app/float.rb

Constant Summary collapse

SIZES = 
{
  2 => "\xf9".b.freeze,
  4 => "\xfa".b.freeze,
  8 => "\xfb".b.freeze,
}

Class Method Summary collapse

Class Method Details

.decode(_, s) ⇒ Object 



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# File 'lib/cbor-diagnostic-app/float.rb', line 8

def self.decode(_, s)
  if CBOR::Sequence === s
    if s.elements.size != 1
      raise ArgumentError.new("cbor-diagnostic: float<< #{s.inspect[1...-1]} >>: Argument Error")
    end
    s = s.first
  end
  unless String === s
    raise ArgumentError.new("cbor-diagnostic: float<< #{s.inspect} >>: Argument Error")
  end
  if s.encoding != Encoding::BINARY
    # remove blank space and comments
    t = s.gsub(%r{\s|/\*(?:[^*]*\*+)(?:[^/*][^*]*\*+)*/|/[^/*][^/]*/|(?:#|//)[^\n]*(?:\n|\z)}, '')
    # check hex format
    unless t =~ /\A([0-9A-Fa-f][0-9A-Fa-f])*\z/
      raise ArgumentError.new("cbor-diagnostic: float'#{t.inspect}' invalid hex: Argument Error")
    end
    # decode hex format
    s = t.chars.each_slice(2).map{ |x| Integer(x.join, 16).chr("BINARY") }.join
  end
  ssize = SIZES[s.size]
  unless ssize
    raise ArgumentError.new("cbor-diagnostic: float<< #{s.inspect} >> size #{s.size} mismatch: Argument Error")
  end
  CBOR::decode(ssize + s)
end