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/ext/transport/chttp2/alpn/alpn.h" 22 23 #include <grpc/support/log.h> 24 25 #include "src/core/lib/gpr/useful.h" 26 27 // in order of preference 28 static const char* const supported_versions[] = {"grpc-exp", "h2"}; 29 grpc_chttp2_is_alpn_version_supported(const char * version,size_t size)30int grpc_chttp2_is_alpn_version_supported(const char* version, size_t size) { 31 size_t i; 32 for (i = 0; i < GPR_ARRAY_SIZE(supported_versions); i++) { 33 if (!strncmp(version, supported_versions[i], size)) return 1; 34 } 35 return 0; 36 } 37 grpc_chttp2_num_alpn_versions(void)38size_t grpc_chttp2_num_alpn_versions(void) { 39 return GPR_ARRAY_SIZE(supported_versions); 40 } 41 grpc_chttp2_get_alpn_version_index(size_t i)42const char* grpc_chttp2_get_alpn_version_index(size_t i) { 43 GPR_ASSERT(i < GPR_ARRAY_SIZE(supported_versions)); 44 return supported_versions[i]; 45 } 46