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diff --git a/lib/nghttp3_gaptr.h b/lib/nghttp3_gaptr.h
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+/*
+ * nghttp3
+ *
+ * Copyright (c) 2019 nghttp3 contributors
+ * Copyright (c) 2017 ngtcp2 contributors
+ *
+ * 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 NGHTTP3_GAPTR_H
+#define NGHTTP3_GAPTR_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <nghttp3/nghttp3.h>
+
+#include "nghttp3_mem.h"
+#include "nghttp3_ksl.h"
+#include "nghttp3_range.h"
+
+/*
+ * nghttp3_gaptr maintains the gap in the range [0, UINT64_MAX).
+ */
+typedef struct nghttp3_gaptr {
+  /* gap maintains the range of offset which is not received
+     yet. Initially, its range is [0, UINT64_MAX). */
+  nghttp3_ksl gap;
+  /* mem is custom memory allocator */
+  const nghttp3_mem *mem;
+} nghttp3_gaptr;
+
+/*
+ * nghttp3_gaptr_init initializes |gaptr|.
+ */
+void nghttp3_gaptr_init(nghttp3_gaptr *gaptr, const nghttp3_mem *mem);
+
+/*
+ * nghttp3_gaptr_free frees resources allocated for |gaptr|.
+ */
+void nghttp3_gaptr_free(nghttp3_gaptr *gaptr);
+
+/*
+ * nghttp3_gaptr_push adds new data of length |datalen| at the stream
+ * offset |offset|.
+ *
+ * This function returns 0 if it succeeds, or one of the following
+ * negative error codes:
+ *
+ * NGHTTP3_ERR_NOMEM
+ *     Out of memory
+ */
+int nghttp3_gaptr_push(nghttp3_gaptr *gaptr, uint64_t offset, uint64_t datalen);
+
+/*
+ * nghttp3_gaptr_first_gap_offset returns the offset to the first gap.
+ * If there is no gap, it returns UINT64_MAX.
+ */
+uint64_t nghttp3_gaptr_first_gap_offset(nghttp3_gaptr *gaptr);
+
+/*
+ * nghttp3_gaptr_get_first_gap_after returns the first gap which
+ * overlaps or comes after |offset|.
+ */
+nghttp3_range nghttp3_gaptr_get_first_gap_after(nghttp3_gaptr *gaptr,
+                                                uint64_t offset);
+
+/*
+ * nghttp3_gaptr_is_pushed returns nonzero if range [offset, offset +
+ * datalen) is completely pushed into this object.
+ */
+int nghttp3_gaptr_is_pushed(nghttp3_gaptr *gaptr, uint64_t offset,
+                            uint64_t datalen);
+
+/*
+ * nghttp3_gaptr_drop_first_gap deletes the first gap entirely as if
+ * the range is pushed.  This function assumes that at least one gap
+ * exists.
+ */
+void nghttp3_gaptr_drop_first_gap(nghttp3_gaptr *gaptr);
+
+#endif /* NGHTTP3_GAPTR_H */