1 // Copyright 2021 gRPC authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 #ifndef GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H 16 #define GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H 17 18 #include <grpc/support/port_platform.h> 19 20 #include <cstddef> 21 #include <cstdint> 22 23 namespace grpc_core { 24 namespace hpack_constants { 25 // Per entry overhead bytes as per the spec 26 static constexpr uint32_t kEntryOverhead = 32; 27 // Initial table size as per the spec 28 static constexpr uint32_t kInitialTableSize = 4096; 29 30 // last index in the static table 31 static constexpr uint32_t kLastStaticEntry = 61; 32 EntriesForBytes(uint32_t bytes)33static constexpr uint32_t EntriesForBytes(uint32_t bytes) noexcept { 34 return (bytes + kEntryOverhead - 1) / kEntryOverhead; 35 } 36 SizeForEntry(size_t key_length,size_t value_length)37static constexpr size_t SizeForEntry(size_t key_length, 38 size_t value_length) noexcept { 39 return key_length + value_length + kEntryOverhead; 40 } 41 42 static constexpr uint32_t kInitialTableEntries = 43 EntriesForBytes(kInitialTableSize); 44 } // namespace hpack_constants 45 } // namespace grpc_core 46 47 #endif // GRPC_SRC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H 48