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Contents
# frozen_string_literal: true
module GirFFI
module Builders
# Encapsulates knowledge about how to store values in pointers, and how to
# fetch values from pointers.
class PointerValueConvertor
def initialize(type_spec)
@type_spec = type_spec
end
def pointer_to_value(ptr_exp, offset = 0)
case ffi_type_spec
when Module
"#{ffi_type_spec}.get_value_from_pointer(#{ptr_exp}, #{offset})"
when Symbol
"#{ptr_exp}.get_#{ffi_type_spec}(#{offset})"
end
end
def value_to_pointer(ptr_exp, value_exp, offset = 0)
case ffi_type_spec
when Module
args = [value_exp, ptr_exp]
args << offset unless offset == 0
"#{ffi_type_spec}.copy_value_to_pointer(#{args.join(', ')})"
when Symbol
"#{ptr_exp}.put_#{ffi_type_spec} #{offset}, #{value_exp}"
end
end
private
attr_reader :type_spec
def ffi_type_spec
TypeMap.type_specification_to_ffi_type type_spec
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems