[ruby/fiddle] Implement Fiddle::Pointer.read and .write on the

FFI backend
(https://github.com/ruby/fiddle/pull/165)

0bd963d3b8

ext/fiddle/lib/fiddle/ffi_backend.rb

@@ -261,6 +261,14 @@ module Fiddle
       end
     end
 
+    def self.write(addr, bytes)
+      FFI::Pointer.new(addr).write_bytes(bytes)
+    end
+
+    def self.read(addr, len)
+      FFI::Pointer.new(addr).read_bytes(len)
+    end
+
     class << self
       alias [] to_ptr
     end

test/fiddle/test_pointer.rb

@@ -11,10 +11,6 @@ module Fiddle
     end
 
     def test_can_read_write_memory
-      if ffi_backend?
-        omit("Fiddle::Pointer.{read,write} don't exist in FFI backend")
-      end
-
       # Allocate some memory
       Fiddle::Pointer.malloc(Fiddle::SIZEOF_VOIDP, Fiddle::RUBY_FREE) do |pointer|
         address = pointer.to_i