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 <grpc/support/log.h> 22 #include "src/core/ext/transport/chttp2/alpn/alpn.h" 23 24 #include "src/core/lib/gpr/useful.h" 25 26 /* in order of preference */ 27 static const char* const supported_versions[] = {"grpc-exp", "h2"}; 28 grpc_chttp2_is_alpn_version_supported(const char * version,size_t size)29int grpc_chttp2_is_alpn_version_supported(const char* version, size_t size) { 30 size_t i; 31 for (i = 0; i < GPR_ARRAY_SIZE(supported_versions); i++) { 32 if (!strncmp(version, supported_versions[i], size)) return 1; 33 } 34 return 0; 35 } 36 grpc_chttp2_num_alpn_versions(void)37size_t grpc_chttp2_num_alpn_versions(void) { 38 return GPR_ARRAY_SIZE(supported_versions); 39 } 40 grpc_chttp2_get_alpn_version_index(size_t i)41const char* grpc_chttp2_get_alpn_version_index(size_t i) { 42 GPR_ASSERT(i < GPR_ARRAY_SIZE(supported_versions)); 43 return supported_versions[i]; 44 } 45