Module: Fiddle::ValueUtil

Included in:
CStructEntity
Defined in:
lib/fiddle/value.rb

Overview

:nodoc: all

Instance Method Summary collapse

Instance Method Details

#signed_value(val, ty) ⇒ Object


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# File 'lib/fiddle/value.rb', line 26

def signed_value(val, ty)
  case ty.abs
  when TYPE_CHAR
    [val].pack("C").unpack("c")[0]
  when TYPE_SHORT
    [val].pack("S!").unpack("s!")[0]
  when TYPE_INT
    [val].pack("I!").unpack("i!")[0]
  when TYPE_LONG
    [val].pack("L!").unpack("l!")[0]
  else
    if defined?(TYPE_LONG_LONG) and
      ty.abs == TYPE_LONG_LONG
      [val].pack("Q").unpack("q")[0]
    else
      val
    end
  end
end

#unsigned_value(val, ty) ⇒ Object


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# File 'lib/fiddle/value.rb', line 6

def unsigned_value(val, ty)
  case ty.abs
  when TYPE_CHAR
    [val].pack("c").unpack("C")[0]
  when TYPE_SHORT
    [val].pack("s!").unpack("S!")[0]
  when TYPE_INT
    [val].pack("i!").unpack("I!")[0]
  when TYPE_LONG
    [val].pack("l!").unpack("L!")[0]
  else
    if defined?(TYPE_LONG_LONG) and
      ty.abs == TYPE_LONG_LONG
      [val].pack("q").unpack("Q")[0]
    else
      val
    end
  end
end

#wrap_arg(arg, ty, funcs = [], &block) ⇒ Object


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# File 'lib/fiddle/value.rb', line 55

def wrap_arg(arg, ty, funcs = [], &block)
  funcs ||= []
  case arg
  when nil
    return 0
  when Pointer
    return arg.to_i
  when IO
    case ty
    when TYPE_VOIDP
      return Pointer[arg].to_i
    else
      return arg.to_i
    end
  when Function
    if( block )
      arg.bind_at_call(&block)
      funcs.push(arg)
    elsif !arg.bound?
      raise(RuntimeError, "block must be given.")
    end
    return arg.to_i
  when String
    if( ty.is_a?(Array) )
      return arg.unpack('C*')
    else
      case SIZEOF_VOIDP
      when SIZEOF_LONG
        return [arg].pack("p").unpack("l!")[0]
      else
        if defined?(SIZEOF_LONG_LONG) and
          SIZEOF_VOIDP == SIZEOF_LONG_LONG
          return [arg].pack("p").unpack("q")[0]
        else
          raise(RuntimeError, "sizeof(void*)?")
        end
      end
    end
  when Float, Integer
    return arg
  when Array
    if( ty.is_a?(Array) ) # used only by struct
      case ty[0]
      when TYPE_VOIDP
        return arg.collect{|v| Integer(v)}
      when TYPE_CHAR
        if( arg.is_a?(String) )
          return val.unpack('C*')
        end
      end
      return arg
    else
      return arg
    end
  else
    if( arg.respond_to?(:to_ptr) )
      return arg.to_ptr.to_i
    else
      begin
        return Integer(arg)
      rescue
        raise(ArgumentError, "unknown argument type: #{arg.class}")
      end
    end
  end
end

#wrap_args(args, tys, funcs, &block) ⇒ Object


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# File 'lib/fiddle/value.rb', line 46

def wrap_args(args, tys, funcs, &block)
  result = []
  tys ||= []
  args.each_with_index{|arg, idx|
    result.push(wrap_arg(arg, tys[idx], funcs, &block))
  }
  result
end