netwerk/cache/nsCacheMetaData.h

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
   2  *
   3  * This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef _nsCacheMetaData_h_
   8 #define _nsCacheMetaData_h_
   9
  10 #include "nspr.h"
  11 #include "nscore.h"
  12
  13 class nsICacheMetaDataVisitor;
  14
  15 class nsCacheMetaData {
  16 public:
  17     nsCacheMetaData() : mBuffer(nullptr), mBufferSize(0), mMetaSize(0) { }
  18
  19     ~nsCacheMetaData() {
  20         mBufferSize = mMetaSize = 0;
  21         moz_free(mBuffer);
  22         mBuffer = nullptr;
  23     }
  24
  25     const char *  GetElement(const char * key);
  26
  27     nsresult      SetElement(const char * key, const char * value);
  28
  29     uint32_t      Size(void) { return mMetaSize; }
  30
  31     nsresult      FlattenMetaData(char * buffer, uint32_t bufSize);
  32
  33     nsresult      UnflattenMetaData(const char * buffer, uint32_t bufSize);
  34
  35     nsresult      VisitElements(nsICacheMetaDataVisitor * visitor);
  36
  37 private:
  38     nsresult      EnsureBuffer(uint32_t size);
  39
  40     char *        mBuffer;
  41     uint32_t      mBufferSize;
  42     uint32_t      mMetaSize;
  43 };
  44
  45 #endif // _nsCacheMetaData_h