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diff --git a/src/core/transport/chttp2/stream_map.h b/src/core/transport/chttp2/stream_map.h
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+++ b/src/core/transport/chttp2/stream_map.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * 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 COPYRIGHT
+ * OWNER 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 __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_MAP_H__
+#define __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_MAP_H__
+
+#include <grpc/support/port_platform.h>
+
+#include <stddef.h>
+
+/* Data structure to map a gpr_uint32 to a data object (represented by a void*)
+
+   Represented as a sorted array of keys, and a corresponding array of values.
+   Lookups are performed with binary search.
+   Adds are restricted to strictly higher keys than previously seen (this is
+   guaranteed by http2). */
+typedef struct {
+  gpr_uint32 *keys;
+  void **values;
+  size_t count;
+  size_t free;
+  size_t capacity;
+} grpc_chttp2_stream_map;
+
+void grpc_chttp2_stream_map_init(grpc_chttp2_stream_map *map,
+                                 size_t initial_capacity);
+void grpc_chttp2_stream_map_destroy(grpc_chttp2_stream_map *map);
+
+/* Add a new key: given http2 semantics, new keys must always be greater than
+   existing keys - this is asserted */
+void grpc_chttp2_stream_map_add(grpc_chttp2_stream_map *map, gpr_uint32 key,
+                                void *value);
+
+/* Delete an existing key - returns the previous value of the key if it existed,
+   or NULL otherwise */
+void *grpc_chttp2_stream_map_delete(grpc_chttp2_stream_map *map,
+                                    gpr_uint32 key);
+
+/* Return an existing key, or NULL if it does not exist */
+void *grpc_chttp2_stream_map_find(grpc_chttp2_stream_map *map, gpr_uint32 key);
+
+/* How many (populated) entries are in the stream map? */
+size_t grpc_chttp2_stream_map_size(grpc_chttp2_stream_map *map);
+
+/* Callback on each stream */
+void grpc_chttp2_stream_map_for_each(grpc_chttp2_stream_map *map,
+                                     void (*f)(void *user_data, gpr_uint32 key,
+                                               void *value),
+                                     void *user_data);
+
+#endif  /* __GRPC_INTERNAL_TRANSPORT_CHTTP2_STREAM_MAP_H__ */