The Tor Browser: dom/xslt/base/txExpandedNameMap.h@97036ab72558 (annotated)

dom/xslt/base/txExpandedNameMap.h@97036ab72558 (annotated)

dom/xslt/base/txExpandedNameMap.h

Tue, 06 Jan 2015 21:39:09 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Tue, 06 Jan 2015 21:39:09 +0100
branch: TOR_BUG_9701
changeset 8: 97036ab72558
permissions: -rw-r--r--

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

 /* -*- 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 TRANSFRMX_EXPANDEDNAMEMAP_H
 #define TRANSFRMX_EXPANDEDNAMEMAP_H
 #include "nsError.h"
 #include "txXMLUtils.h"
 #include "nsTArray.h"
 class txExpandedNameMap_base {
 protected:
     /**
      * Adds an item, if an item with this key already exists an error is
      * returned
      * @param  aKey   key for item to add
      * @param  aValue value of item to add
      * @return errorcode
      */
     nsresult addItem(const txExpandedName& aKey, void* aValue);
     /**
      * Sets an item, if an item with this key already exists it is overwritten
      * with the new value
      * @param  aKey   key for item to set
      * @param  aValue value of item to set
      * @return errorcode
      */
     nsresult setItem(const txExpandedName& aKey, void* aValue,
                      void** aOldValue);
     /**
      * Gets an item
      * @param  aKey  key for item to get
      * @return item with specified key, or null if no such item exists
      */
     void* getItem(const txExpandedName& aKey) const;
     /**
      * Removes an item, deleting it if the map owns the values
      * @param  aKey  key for item to remove
      * @return item with specified key, or null if it has been deleted
      *         or no such item exists
      */
     void* removeItem(const txExpandedName& aKey);
     /**
      * Clears the items
      */
     void clearItems()
     {
         mItems.Clear();
     }
     class iterator_base {
     public:
         iterator_base(txExpandedNameMap_base& aMap)
             : mMap(aMap),
               mCurrentPos(uint32_t(-1))
         {
         }
         bool next()
         {
             return ++mCurrentPos < mMap.mItems.Length();
         }
         const txExpandedName key()
         {
             NS_ASSERTION(mCurrentPos < mMap.mItems.Length(),
                          "invalid position in txExpandedNameMap::iterator");
             return txExpandedName(mMap.mItems[mCurrentPos].mNamespaceID,
                                   mMap.mItems[mCurrentPos].mLocalName);
         }
     protected:
         void* itemValue()
         {
             NS_ASSERTION(mCurrentPos < mMap.mItems.Length(),
                          "invalid position in txExpandedNameMap::iterator");
             return mMap.mItems[mCurrentPos].mValue;
         }
     private:
         txExpandedNameMap_base& mMap;
         uint32_t mCurrentPos;
     };
     friend class iterator_base;
     friend class txMapItemComparator;
     struct MapItem {
         int32_t mNamespaceID;
         nsCOMPtr<nsIAtom> mLocalName;
         void* mValue;
     };
     nsTArray<MapItem> mItems;
 };
 template<class E>
 class txExpandedNameMap : public txExpandedNameMap_base
 {
 public:
     nsresult add(const txExpandedName& aKey, E* aValue)
     {
         return addItem(aKey, (void*)aValue);
     }
     nsresult set(const txExpandedName& aKey, E* aValue)
     {
         void* oldValue;
         return setItem(aKey, (void*)aValue, &oldValue);
     }
     E* get(const txExpandedName& aKey) const
     {
         return (E*)getItem(aKey);
     }
     E* remove(const txExpandedName& aKey)
     {
         return (E*)removeItem(aKey);
     }
     void clear()
     {
         clearItems();
     }
     class iterator : public iterator_base
     {
     public:
         iterator(txExpandedNameMap& aMap)
             : iterator_base(aMap)
         {
         }
         E* value()
         {
             return (E*)itemValue();
         }
     };
 };
 template<class E>
 class txOwningExpandedNameMap : public txExpandedNameMap_base
 {
 public:
     ~txOwningExpandedNameMap()
     {
         clear();
     }
     nsresult add(const txExpandedName& aKey, E* aValue)
     {
         return addItem(aKey, (void*)aValue);
     }
     nsresult set(const txExpandedName& aKey, E* aValue)
     {
         nsAutoPtr<E> oldValue;
         return setItem(aKey, (void*)aValue, getter_Transfers(oldValue));
     }
     E* get(const txExpandedName& aKey) const
     {
         return (E*)getItem(aKey);
     }
     void remove(const txExpandedName& aKey)
     {
         delete (E*)removeItem(aKey);
     }
     void clear()
     {
         uint32_t i, len = mItems.Length();
         for (i = 0; i < len; ++i) {
             delete (E*)mItems[i].mValue;
         }
         clearItems();
     }
     class iterator : public iterator_base
     {
     public:
         iterator(txOwningExpandedNameMap& aMap)
             : iterator_base(aMap)
         {
         }
         E* value()
         {
             return (E*)itemValue();
         }
     };
 };
 #endif //TRANSFRMX_EXPANDEDNAMEMAP_H

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dom/xslt/base/txExpandedNameMap.h@97036ab72558 (annotated)

dom/xslt/base/txExpandedNameMap.h