chromium/third_party/abseil-cpp/absl/strings/internal/cord_rep_crc.h

// Copyright 2021 The Abseil 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
//
//     https://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 ABSL_STRINGS_INTERNAL_CORD_REP_CRC_H_
#define ABSL_STRINGS_INTERNAL_CORD_REP_CRC_H_

#include <cassert>
#include <cstdint>

#include "absl/base/config.h"
#include "absl/base/optimization.h"
#include "absl/crc/internal/crc_cord_state.h"
#include "absl/strings/internal/cord_internal.h"

namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {

// CordRepCrc is a CordRep node intended only to appear at the top level of a
// cord tree.  It associates an "expected CRC" with the contained data, to allow
// for easy passage of checksum data in Cord data flows.
//
// From Cord's perspective, the crc value has no semantics; any validation of
// the contained checksum is the user's responsibility.
struct CordRepCrc : public CordRep { … };

// Consumes `rep` and returns a CordRep* with any outer CordRepCrc wrapper
// removed.  This is usually a no-op (returning `rep`), but this will remove and
// unref an outer CordRepCrc node.
inline CordRep* RemoveCrcNode(CordRep* rep) { … }

// Returns `rep` if it is not a CordRepCrc node, or its child if it is.
// Does not consume or create a reference on `rep` or the returned value.
inline CordRep* SkipCrcNode(CordRep* rep) { … }

inline const CordRep* SkipCrcNode(const CordRep* rep) { … }

inline CordRepCrc* CordRep::crc() { … }

inline const CordRepCrc* CordRep::crc() const { … }

}  // namespace cord_internal
ABSL_NAMESPACE_END
}  // namespace absl

#endif  // ABSL_STRINGS_INTERNAL_CORD_REP_CRC_H_