diff --git a/lib/rb/ext/macros.h b/lib/rb/ext/macros.h
new file mode 100644
index 0000000..265f693
--- /dev/null
+++ b/lib/rb/ext/macros.h
@@ -0,0 +1,41 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+#define GET_TRANSPORT(obj) rb_ivar_get(obj, transport_ivar_id)
+#define GET_STRICT_READ(obj) rb_ivar_get(obj, strict_read_ivar_id)
+#define GET_STRICT_WRITE(obj) rb_ivar_get(obj, strict_write_ivar_id)
+#define WRITE(obj, data, length) rb_funcall(obj, write_method_id, 1, rb_str_new(data, length))
+#define CHECK_NIL(obj) if (NIL_P(obj)) { rb_raise(rb_eStandardError, "nil argument not allowed!");}
+#define READ(obj, length) rb_funcall(GET_TRANSPORT(obj), read_all_method_id, 1, INT2FIX(length))
+
+#ifndef RFLOAT_VALUE
+#  define RFLOAT_VALUE(v) RFLOAT(rb_Float(v))->value
+#endif
+
+#ifndef RSTRING_LEN
+#  define RSTRING_LEN(v) RSTRING(rb_String(v))->len
+#endif
+
+#ifndef RSTRING_PTR
+#  define RSTRING_PTR(v) RSTRING(rb_String(v))->ptr
+#endif
+
+#ifndef RARRAY_LEN
+#  define RARRAY_LEN(v) RARRAY(rb_Array(v))->len
+#endif