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Versions: 9
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Contents
# frozen_string_literal: true
module GirFFI
# Represents a null-terminated array.
class ZeroTerminated
include Enumerable
attr_reader :element_type
def initialize(elm_t, ptr)
@element_type = elm_t
@ptr = ptr
end
def to_ptr
@ptr
end
def self.from(type, arg)
new type, InPointer.from_array(type, arg)
end
def self.wrap(type, arg)
new type, arg
end
def each
return if @ptr.null?
offset = 0
while (val = read_value(offset))
offset += ffi_type_size
yield wrap_value(val)
end
end
def ==(other)
to_a == other.to_a
end
private
def read_value(offset)
val = fetch_value(offset)
val unless val.zero?
end
def getter_method
@getter_method ||= "get_#{ffi_type}"
end
def fetch_value(offset)
case ffi_type
when Module
ffi_type.get_value_from_pointer(@ptr, offset)
when Symbol
@ptr.send(getter_method, offset)
else
raise NotImplementedError
end
end
def wrap_value(val)
case element_type
when Array
element_type.last.wrap val
when Class
element_type.wrap val
else
val
end
end
def ffi_type
@ffi_type ||= TypeMap.type_specification_to_ffi_type element_type
end
def ffi_type_size
@ffi_type_size ||= FFI.type_size(ffi_type)
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems