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 /* -*- 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;  

         moz_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