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diff --git a/ext/protozero/include/protozero/buffer_tmpl.hpp b/ext/protozero/include/protozero/buffer_tmpl.hpp
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+++ b/ext/protozero/include/protozero/buffer_tmpl.hpp
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+#ifndef PROTOZERO_BUFFER_TMPL_HPP
+#define PROTOZERO_BUFFER_TMPL_HPP
+
+/*****************************************************************************
+
+protozero - Minimalistic protocol buffer decoder and encoder in C++.
+
+This file is from https://github.com/mapbox/protozero where you can find more
+documentation.
+
+*****************************************************************************/
+
+/**
+ * @file buffer_tmpl.hpp
+ *
+ * @brief Contains the customization points for buffer implementations.
+ */
+
+#include <cstddef>
+#include <iterator>
+#include <string>
+
+namespace protozero {
+
+// Implementation of buffer customizations points for std::string
+
+/// @cond INTERNAL
+template <typename T>
+struct buffer_customization {
+
+    /**
+     * Get the number of bytes currently used in the buffer.
+     *
+     * @param buffer Pointer to the buffer.
+     * @returns number of bytes used in the buffer.
+     */
+    static std::size_t size(const std::string* buffer);
+
+    /**
+     * Append count bytes from data to the buffer.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param data Pointer to the data.
+     * @param count Number of bytes to be added to the buffer.
+     */
+    static void append(std::string* buffer, const char* data, std::size_t count);
+
+    /**
+     * Append count zero bytes to the buffer.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param count Number of bytes to be added to the buffer.
+     */
+    static void append_zeros(std::string* buffer, std::size_t count);
+
+    /**
+     * Shrink the buffer to the specified size. The new size will always be
+     * smaller than the current size.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param size New size of the buffer.
+     *
+     * @pre size < current size of buffer
+     */
+    static void resize(std::string* buffer, std::size_t size);
+
+    /**
+     * Reserve an additional size bytes for use in the buffer. This is used for
+     * variable-sized buffers to tell the buffer implementation that soon more
+     * memory will be used. The implementation can ignore this.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param size Number of bytes to reserve.
+     */
+    static void reserve_additional(std::string* buffer, std::size_t size);
+
+    /**
+     * Delete data from the buffer. This must move back the data after the
+     * part being deleted and resize the buffer accordingly.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param from Offset into the buffer where we want to erase from.
+     * @param to Offset into the buffer one past the last byte we want to erase.
+     *
+     * @pre from, to <= size of the buffer, from < to
+     */
+    static void erase_range(std::string* buffer, std::size_t from, std::size_t to);
+
+    /**
+     * Return a pointer to the memory at the specified position in the buffer.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param pos The position in the buffer.
+     * @returns pointer to the memory in the buffer at the specified position.
+     *
+     * @pre pos <= size of the buffer
+     */
+    static char* at_pos(std::string* buffer, std::size_t pos);
+
+    /**
+     * Add a char to the buffer incrementing the number of chars in the buffer.
+     *
+     * @param buffer Pointer to the buffer.
+     * @param ch The character to add.
+     */
+    static void push_back(std::string* buffer, char ch);
+
+};
+/// @endcond
+
+} // namespace protozero
+
+#endif // PROTOZERO_BUFFER_TMPL_HPP