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diff --git a/src/nghttp2_gzip.h b/src/nghttp2_gzip.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 Tatsuhiro Tsujikawa
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef NGHTTP2_GZIP_H
+
+#  ifdef HAVE_CONFIG_H
+#    include <config.h>
+#  endif /* HAVE_CONFIG_H */
+#  include <zlib.h>
+
+#  include <nghttp2/nghttp2.h>
+
+#  ifdef __cplusplus
+extern "C" {
+#  endif
+
+/**
+ * @struct
+ *
+ * The gzip stream to inflate data.
+ */
+typedef struct {
+  z_stream zst;
+  int8_t finished;
+} nghttp2_gzip;
+
+/**
+ * @function
+ *
+ * A helper function to set up a per request gzip stream to inflate
+ * data.
+ *
+ * This function returns 0 if it succeeds, or -1.
+ */
+int nghttp2_gzip_inflate_new(nghttp2_gzip **inflater_ptr);
+
+/**
+ * @function
+ *
+ * Frees the inflate stream.  The |inflater| may be ``NULL``.
+ */
+void nghttp2_gzip_inflate_del(nghttp2_gzip *inflater);
+
+/**
+ * @function
+ *
+ * Inflates data in |in| with the length |*inlen_ptr| and stores the
+ * inflated data to |out| which has allocated size at least
+ * |*outlen_ptr|.  On return, |*outlen_ptr| is updated to represent
+ * the number of data written in |out|.  Similarly, |*inlen_ptr| is
+ * updated to represent the number of input bytes processed.
+ *
+ * This function returns 0 if it succeeds, or -1.
+ *
+ * The example follows::
+ *
+ *     void on_data_chunk_recv_callback(nghttp2_session *session,
+ *                                      uint8_t flags,
+ *                                      int32_t stream_id,
+ *                                      const uint8_t *data, size_t len,
+ *                                      void *user_data)
+ *     {
+ *         ...
+ *         req = nghttp2_session_get_stream_user_data(session, stream_id);
+ *         nghttp2_gzip *inflater = req->inflater;
+ *         while(len > 0) {
+ *             uint8_t out[MAX_OUTLEN];
+ *             size_t outlen = MAX_OUTLEN;
+ *             size_t tlen = len;
+ *             int rv;
+ *             rv = nghttp2_gzip_inflate(inflater, out, &outlen, data, &tlen);
+ *             if(rv != 0) {
+ *                 nghttp2_submit_rst_stream(session, stream_id,
+ *                                           NGHTTP2_INTERNAL_ERROR);
+ *                 break;
+ *             }
+ *             ... Do stuff ...
+ *             data += tlen;
+ *             len -= tlen;
+ *         }
+ *         ....
+ *     }
+ */
+int nghttp2_gzip_inflate(nghttp2_gzip *inflater, uint8_t *out,
+                         size_t *outlen_ptr, const uint8_t *in,
+                         size_t *inlen_ptr);
+
+/**
+ * @function
+ *
+ * Returns nonzero if |inflater| sees the end of deflate stream.
+ * After this function returns nonzero, `nghttp2_gzip_inflate()` with
+ * |inflater| gets to return error.
+ */
+int nghttp2_gzip_inflate_finished(nghttp2_gzip *inflater);
+
+#  ifdef __cplusplus
+}
+#  endif
+
+#endif /* NGHTTP2_GZIP_H */