hpack_constants.h

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// Copyright 2021 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
 
#ifndef GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H
#define GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H
 
#include <grpc/support/port_platform.h>
 
#include <stdint.h>
 
namespace grpc_core {
namespace hpack_constants {
// Per entry overhead bytes as per the spec
static constexpr uint32_t kEntryOverhead = 32;
// Initial table size as per the spec
static constexpr uint32_t kInitialTableSize = 4096;
 
// last index in the static table
static constexpr uint32_t kLastStaticEntry = 61;
 
static constexpr uint32_t EntriesForBytes(uint32_t bytes) noexcept {
  return (bytes + kEntryOverhead - 1) / kEntryOverhead;
}
 
static constexpr uint32_t kInitialTableEntries =
    EntriesForBytes(kInitialTableSize);
}  // namespace hpack_constants
}  // namespace grpc_core
 
#endif  // GRPC_CORE_EXT_TRANSPORT_CHTTP2_TRANSPORT_HPACK_CONSTANTS_H