Module: BinData::Int

Defined in:
lib/bindata/int.rb

Overview

Defines a number of classes that contain an integer. The integer is defined by endian, signedness and number of bytes.

Class Method Summary collapse

Class Method Details

.class_name(nbits, endian, signed) ⇒ Object 



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# File 'lib/bindata/int.rb', line 22

def class_name(nbits, endian, signed)
  endian_str = (endian == :big) ? "be" : "le"
  base = (signed == :signed) ? "Int" : "Uint"

  "#{base}#{nbits}#{endian_str}"
end

.define_class(nbits, endian, signed) ⇒ Object 



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# File 'lib/bindata/int.rb', line 9

def define_class(nbits, endian, signed)
  name = class_name(nbits, endian, signed)
  unless BinData.const_defined?(name)
    BinData.module_eval "      class \#{name} < BinData::BasePrimitive\n        Int.define_methods(self, \#{nbits}, :\#{endian}, :\#{signed})\n      end\n    END\n  end\n\n  BinData.const_get(name)\nend\n"

.define_methods(int_class, nbits, endian, signed) ⇒ Object 



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# File 'lib/bindata/int.rb', line 29

def define_methods(int_class, nbits, endian, signed)
  raise "nbits must be divisible by 8" unless (nbits % 8).zero?

  int_class.module_eval "    def assign(val)\n      \#{create_clamp_code(nbits, signed)}\n      super(val)\n    end\n\n    def do_num_bytes\n      \#{nbits / 8}\n    end\n\n    #---------------\n    private\n\n    def sensible_default\n      0\n    end\n\n    def value_to_binary_string(val)\n      \#{create_clamp_code(nbits, signed)}\n      \#{create_int2uint_code(nbits) if signed == :signed}\n      \#{create_to_binary_s_code(nbits, endian)}\n    end\n\n    def read_and_return_value(io)\n      val = \#{create_read_code(nbits, endian)}\n      \#{create_uint2int_code(nbits) if signed == :signed}\n      val\n    end\n  END\nend\n"