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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 #include <grpc/support/port_platform.h>
20 
21 #include "src/core/lib/security/credentials/credentials.h"
22 
23 #include <grpc/support/alloc.h>
24 
25 #include <string.h>
26 
27 #include "src/core/lib/slice/slice_internal.h"
28 
mdelem_list_ensure_capacity(grpc_credentials_mdelem_array * list,size_t additional_space_needed)29 static void mdelem_list_ensure_capacity(grpc_credentials_mdelem_array* list,
30                                         size_t additional_space_needed) {
31   size_t target_size = list->size + additional_space_needed;
32   // Find the next power of two greater than the target size (i.e.,
33   // whenever we add more space, we double what we already have).
34   size_t new_size = 2;
35   while (new_size < target_size) {
36     new_size *= 2;
37   }
38   list->md = static_cast<grpc_mdelem*>(
39       gpr_realloc(list->md, sizeof(grpc_mdelem) * new_size));
40 }
41 
grpc_credentials_mdelem_array_add(grpc_credentials_mdelem_array * list,grpc_mdelem md)42 void grpc_credentials_mdelem_array_add(grpc_credentials_mdelem_array* list,
43                                        grpc_mdelem md) {
44   mdelem_list_ensure_capacity(list, 1);
45   list->md[list->size++] = GRPC_MDELEM_REF(md);
46 }
47 
grpc_credentials_mdelem_array_append(grpc_credentials_mdelem_array * dst,grpc_credentials_mdelem_array * src)48 void grpc_credentials_mdelem_array_append(grpc_credentials_mdelem_array* dst,
49                                           grpc_credentials_mdelem_array* src) {
50   mdelem_list_ensure_capacity(dst, src->size);
51   for (size_t i = 0; i < src->size; ++i) {
52     dst->md[dst->size++] = GRPC_MDELEM_REF(src->md[i]);
53   }
54 }
55 
grpc_credentials_mdelem_array_destroy(grpc_credentials_mdelem_array * list)56 void grpc_credentials_mdelem_array_destroy(
57     grpc_credentials_mdelem_array* list) {
58   for (size_t i = 0; i < list->size; ++i) {
59     GRPC_MDELEM_UNREF(list->md[i]);
60   }
61   gpr_free(list->md);
62 }
63