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1 /*
2  *
3  * Copyright 2015 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18 
19 #ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H
20 #define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H
21 
22 #include <grpc/support/port_platform.h>
23 
24 #include <stddef.h>
25 
26 /* Data structure to map a uint32_t to a data object (represented by a void*)
27 
28    Represented as a sorted array of keys, and a corresponding array of values.
29    Lookups are performed with binary search.
30    Adds are restricted to strictly higher keys than previously seen (this is
31    guaranteed by http2). */
32 typedef struct {
33   uint32_t* keys;
34   void** values;
35   size_t count;
36   size_t free;
37   size_t capacity;
38 } grpc_chttp2_stream_map;
39 
40 void grpc_chttp2_stream_map_init(grpc_chttp2_stream_map* map,
41                                  size_t initial_capacity);
42 void grpc_chttp2_stream_map_destroy(grpc_chttp2_stream_map* map);
43 
44 /* Add a new key: given http2 semantics, new keys must always be greater than
45    existing keys - this is asserted */
46 void grpc_chttp2_stream_map_add(grpc_chttp2_stream_map* map, uint32_t key,
47                                 void* value);
48 
49 /* Delete an existing key - returns the previous value of the key if it existed,
50    or NULL otherwise */
51 void* grpc_chttp2_stream_map_delete(grpc_chttp2_stream_map* map, uint32_t key);
52 
53 /* Return an existing key, or NULL if it does not exist */
54 void* grpc_chttp2_stream_map_find(grpc_chttp2_stream_map* map, uint32_t key);
55 
56 /* Return a random entry */
57 void* grpc_chttp2_stream_map_rand(grpc_chttp2_stream_map* map);
58 
59 /* How many (populated) entries are in the stream map? */
60 size_t grpc_chttp2_stream_map_size(grpc_chttp2_stream_map* map);
61 
62 /* Callback on each stream */
63 void grpc_chttp2_stream_map_for_each(grpc_chttp2_stream_map* map,
64                                      void (*f)(void* user_data, uint32_t key,
65                                                void* value),
66                                      void* user_data);
67 
68 #endif /* GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_STREAM_MAP_H */
69