diff --git a/blender_asset_tracer/blendfile/__init__.py b/blender_asset_tracer/blendfile/__init__.py
index 196ffcc..c1a6414 100644
--- a/blender_asset_tracer/blendfile/__init__.py
+++ b/blender_asset_tracer/blendfile/__init__.py
@@ -372,15 +372,13 @@ class BlendFileBlock:
         sdna_index = self.bfile.sdna_index_from_id[dna_type_id]
         self.refine_type_from_index(sdna_index)
 
-    def get_file_offset(self, path: bytes) -> (int, int):  # TODO(Sybren): port to BAT
-        """Return (offset, length)"""
-        assert isinstance(path, bytes)
+    def abs_offset(self, path: dna.FieldPath) -> (int, int):
+        """Compute the absolute file offset of the field.
 
-        # TODO: refactor to just return the length, and check whether this isn't actually
-        # simply the same as self.size.
-        ofs = self.file_offset
-        field, _ = self.dna_type.field_from_path(self.bfile.header.pointer_size, path)
-        return ofs, field.name.array_size
+        :returns: tuple (offset in bytes, length of array in items)
+        """
+        field, field_offset = self.dna_type.field_from_path(self.bfile.header.pointer_size, path)
+        return self.file_offset + field_offset, field.name.array_size
 
     def get(self,
             path: dna.FieldPath,
diff --git a/tests/test_blendfile_loading.py b/tests/test_blendfile_loading.py
index 7625296..1e132f7 100644
--- a/tests/test_blendfile_loading.py
+++ b/tests/test_blendfile_loading.py
@@ -206,6 +206,15 @@ class PointerTest(AbstractBlendFileTest):
         with self.assertRaises(exceptions.SegmentationFault):
             scene.get_pointer(b'ed')
 
+    def test_abs_offset(self):
+        scene = self.bf.code_index[b'SC'][0]
+        ed = scene.get_pointer(b'ed')
+        assert isinstance(ed, blendfile.BlendFileBlock)
+
+        abs_offset, field_size = ed.abs_offset((b'seqbase', b'first'))
+        self.assertEqual(ed.file_offset + 8, abs_offset)
+        self.assertEqual(1, field_size)
+
 
 class LoadCompressedTest(AbstractBlendFileTest):
     def test_loading(self):