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 "test/core/util/parse_hexstring.h" 20 21 #include <stddef.h> 22 #include <stdint.h> 23 24 #include <grpc/slice.h> 25 #include <grpc/support/log.h> 26 27 namespace grpc_core { ParseHexstring(absl::string_view hexstring)28Slice ParseHexstring(absl::string_view hexstring) { 29 size_t nibbles = 0; 30 uint8_t* out; 31 uint8_t temp; 32 grpc_slice slice; 33 34 for (auto c : hexstring) { 35 nibbles += (c >= '0' && c <= '9') || (c >= 'a' && c <= 'f'); 36 } 37 38 GPR_ASSERT((nibbles & 1) == 0); 39 40 slice = grpc_slice_malloc(nibbles / 2); 41 out = GRPC_SLICE_START_PTR(slice); 42 43 nibbles = 0; 44 temp = 0; 45 for (auto c : hexstring) { 46 if (c >= '0' && c <= '9') { 47 temp = static_cast<uint8_t>(temp << 4) | static_cast<uint8_t>(c - '0'); 48 nibbles++; 49 } else if (c >= 'a' && c <= 'f') { 50 temp = 51 static_cast<uint8_t>(temp << 4) | static_cast<uint8_t>(c - 'a' + 10); 52 nibbles++; 53 } 54 if (nibbles == 2) { 55 *out++ = temp; 56 nibbles = 0; 57 } 58 } 59 60 return Slice(slice); 61 } 62 } // namespace grpc_core 63