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diff --git a/ext/buffer.h b/ext/buffer.h
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+/* mbed Microcontroller Library
+ * Copyright (c) 2014-2015 ARM Limited
+ *
+ * Licensed 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.
+ */
+#ifndef MBED_BUFFER_H
+#define MBED_BUFFER_H
+
+#include <stddef.h>
+
+/** Generic buffer structure
+ */
+typedef struct buffer_s {
+    void    *buffer; /**< the pointer to a buffer */
+    size_t   length; /**< the buffer length */
+    size_t   pos;    /**< actual buffer position */
+    uint8_t  width;  /**< The buffer unit width (8, 16, 32, 64), used for proper *buffer casting */
+} buffer_t;
+
+#endif