Module: GirFFI::ArgHelper

Defined in:
lib/gir_ffi/arg_helper.rb

Overview

Helper module containing methods used during argument conversion in generated methods.

Constant Summary collapse

OBJECT_STORE = 
ObjectStore.new

Class Method Summary collapse

Class Method Details

.cast_from_pointer(type, ptr) ⇒ Object

NOTE: Only used in List, SList and HashTable classes. TODO: Stop using basic types and instead cast type to an ITypeInfo look-alike.



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# File 'lib/gir_ffi/arg_helper.rb', line 27

def self.cast_from_pointer(type, ptr)
  case type
  when Symbol
    cast_from_simple_type_pointer(type, ptr)
  when Class
    type.wrap ptr
  when Array
    cast_from_complex_type_pointer(type, ptr)
  end
end

.cast_pointer_to_int32(ptr) ⇒ Object 



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# File 'lib/gir_ffi/arg_helper.rb', line 46

def self.cast_pointer_to_int32(ptr)
  cast_uint32_to_int32(ptr.address & 0xffffffff)
end

.cast_uint32_to_int32(val) ⇒ Object 



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# File 'lib/gir_ffi/arg_helper.rb', line 38

def self.cast_uint32_to_int32(val)
  if val >= 0x80000000
    -(0x100000000 - val)
  else
    val
  end
end

.check_error(errpp) ⇒ Object

Raises:



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# File 'lib/gir_ffi/arg_helper.rb', line 13

def self.check_error(errpp)
  err = GLib::Error.wrap(errpp.read_pointer)
  raise GLibError, err if err
end

.check_fixed_array_size(size, arr, name) ⇒ Object 



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# File 'lib/gir_ffi/arg_helper.rb', line 18

def self.check_fixed_array_size(size, arr, name)
  unless arr.size.equal? size
    raise ArgumentError, "#{name} should have size #{size}"
  end
end

.store(obj) ⇒ Object 



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# File 'lib/gir_ffi/arg_helper.rb', line 50

def self.store(obj)
  OBJECT_STORE.store(obj)
end