/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-

 *

 * 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