Do NULL pointer check only when array length > 0

This changes array read and write methods to no longer raise a FFI::NullPointerError if there is actually no memory access.

Fixes #305

1 files changed, 5 insertions, 0 deletions

diff --git a/spec/ffi/pointer_spec.rb b/spec/ffi/pointer_spec.rb
index 97f3c5f..97954cd 100644
--- a/spec/ffi/pointer_spec.rb
+++ b/spec/ffi/pointer_spec.rb
@@ -143,6 +143,11 @@ describe "Pointer" do
     it 'returns true when compared with nil' do
       expect((FFI::Pointer::NULL == nil)).to be true
     end
+    it 'should not raise an error when attempting read/write zero length array' do
+      null_ptr = FFI::Pointer::NULL
+      expect( null_ptr.read_array_of_uint(0) ).to eq([])
+      null_ptr.write_array_of_uint([])
+    end
   end
 
   it "Pointer.size returns sizeof pointer on platform" do