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diff --git a/src/util/WritableBuffer.hxx b/src/util/WritableBuffer.hxx
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+/*
+ * Copyright (C) 2013 Max Kellermann <max@duempel.org>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the
+ * distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
+ * FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WRITABLE_BUFFER_HPP
+#define WRITABLE_BUFFER_HPP
+
+#include "Compiler.h"
+
+#include <stddef.h>
+
+/**
+ * A reference to a memory area that is writable.
+ *
+ * @see ConstBuffer
+ */
+template<typename T>
+struct WritableBuffer {
+  typedef size_t size_type;
+  typedef T *pointer_type;
+  typedef const T *const_pointer_type;
+  typedef pointer_type iterator;
+  typedef const_pointer_type const_iterator;
+
+  pointer_type data;
+  size_type size;
+
+  WritableBuffer() = default;
+
+  constexpr WritableBuffer(pointer_type _data, size_type _size)
+    :data(_data), size(_size) {}
+
+  constexpr static WritableBuffer Null() {
+    return { nullptr, 0 };
+  }
+
+  constexpr bool IsNull() const {
+    return data == nullptr;
+  }
+
+  constexpr bool IsEmpty() const {
+    return size == 0;
+  }
+
+  constexpr iterator begin() const {
+    return data;
+  }
+
+  constexpr iterator end() const {
+    return data + size;
+  }
+
+  constexpr const_iterator cbegin() const {
+    return data;
+  }
+
+  constexpr const_iterator cend() const {
+    return data + size;
+  }
+};
+
+#endif