/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef _nsCacheMetaData_h_
#define _nsCacheMetaData_h_

#include "nspr.h"
#include "nscore.h"

class nsICacheMetaDataVisitor;

class nsCacheMetaData {
 public:
  nsCacheMetaData() : mBuffer(nullptr), mBufferSize(0), mMetaSize(0) {}

  ~nsCacheMetaData() {
    mBufferSize = mMetaSize = 0;
    free(mBuffer);
    mBuffer = nullptr;
  }

  const char* GetElement(const char* key);

  nsresult SetElement(const char* key, const char* value);

  uint32_t Size(void) { return mMetaSize; }

  nsresult FlattenMetaData(char* buffer, uint32_t bufSize);

  nsresult UnflattenMetaData(const char* buffer, uint32_t bufSize);

  nsresult VisitElements(nsICacheMetaDataVisitor* visitor);

 private:
  nsresult EnsureBuffer(uint32_t size);

  char* mBuffer;
  uint32_t mBufferSize;
  uint32_t mMetaSize;
};

#endif  // _nsCacheMetaData_h