// Copyright 2026 The TCMalloc 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 TCMALLOC_INTERNAL_COMPRESSIBILITY_H_
#define TCMALLOC_INTERNAL_COMPRESSIBILITY_H_

#include <cstddef>
#include <cstdint>

#include "absl/container/fixed_array.h"
#include "absl/status/statusor.h"
#include "absl/types/span.h"

namespace tcmalloc {
namespace tcmalloc_internal {

class CompressionAnalyzer {
 public:
  static constexpr size_t kDefaultMaxLocalCopySize = 2 * 1024 * 1024;

  explicit CompressionAnalyzer(
      size_t max_local_copy_size = kDefaultMaxLocalCopySize);

  struct Results {
    size_t zero_bytes = 0;
    size_t trailing_zero_bytes = 0;
  };

  absl::StatusOr<Results> Analyze(absl::Span<const char> data);

 private:
  absl::FixedArray<char> local_copy_;
};

}  // namespace tcmalloc_internal
}  // namespace tcmalloc

#endif  // TCMALLOC_INTERNAL_COMPRESSIBILITY_H_
