The Tor Browser: accessible/src/windows/msaa/ServiceProvider.cpp@97036ab72558

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.

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */

     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/. */

     7 #include "ServiceProvider.h"

     9 #include "ApplicationAccessibleWrap.h"

    10 #include "Compatibility.h"

    11 #include "DocAccessible.h"

    12 #include "nsAccUtils.h"

    13 #include "nsCoreUtils.h"

    14 #include "Relation.h"

    15 #include "uiaRawElmProvider.h"

    17 #include "mozilla/Preferences.h"

    18 #include "nsIDocShell.h"

    20 #include "ISimpleDOMNode_i.c"

    22 namespace mozilla {

    23 namespace a11y {

    25 IMPL_IUNKNOWN_QUERY_HEAD(ServiceProvider)

    26   IMPL_IUNKNOWN_QUERY_IFACE(IServiceProvider)

    27 IMPL_IUNKNOWN_QUERY_TAIL_AGGREGATED(mAccessible)

    30 ////////////////////////////////////////////////////////////////////////////////

    31 // IServiceProvider

    33 STDMETHODIMP

    34 ServiceProvider::QueryService(REFGUID aGuidService, REFIID aIID,

    35                               void** aInstancePtr)

    36 {

    37   if (!aInstancePtr)

    38     return E_INVALIDARG;

    40   *aInstancePtr = nullptr;

    42   // UIA IAccessibleEx

    43   if (aGuidService == IID_IAccessibleEx &&

    44       Preferences::GetBool("accessibility.uia.enable")) {

    45     uiaRawElmProvider* accEx = new uiaRawElmProvider(mAccessible);

    46     HRESULT hr = accEx->QueryInterface(aIID, aInstancePtr);

    47     if (FAILED(hr))

    48       delete accEx;

    50     return hr;

    51   }

    53   // Provide a special service ID for getting the accessible for the browser tab

    54   // document that contains this accessible object. If this accessible object

    55   // is not inside a browser tab then the service fails with E_NOINTERFACE.

    56   // A use case for this is for screen readers that need to switch context or

    57   // 'virtual buffer' when focus moves from one browser tab area to another.

    58   static const GUID SID_IAccessibleContentDocument =

    59     { 0xa5d8e1f3,0x3571,0x4d8f,{0x95,0x21,0x07,0xed,0x28,0xfb,0x07,0x2e} };

    60   if (aGuidService == SID_IAccessibleContentDocument) {

    61     if (aIID != IID_IAccessible)

    62       return E_NOINTERFACE;

    64     Relation rel = mAccessible->RelationByType(RelationType::CONTAINING_TAB_PANE);

    65     AccessibleWrap* tabDoc = static_cast<AccessibleWrap*>(rel.Next());

    66     if (!tabDoc)

    67       return E_NOINTERFACE;

    69     *aInstancePtr = static_cast<IAccessible*>(tabDoc);

    70     (reinterpret_cast<IUnknown*>(*aInstancePtr))->AddRef();

    71     return S_OK;

    72   }

    74   // Can get to IAccessibleApplication from any node via QS

    75   if (aGuidService == IID_IAccessibleApplication ||

    76       (Compatibility::IsJAWS() && aIID == IID_IAccessibleApplication)) {

    77     ApplicationAccessibleWrap* applicationAcc =

    78       static_cast<ApplicationAccessibleWrap*>(ApplicationAcc());

    79     if (!applicationAcc)

    80       return E_NOINTERFACE;

    82     return applicationAcc->QueryInterface(aIID, aInstancePtr);

    83   }

    85   static const GUID IID_SimpleDOMDeprecated =

    86     { 0x0c539790,0x12e4,0x11cf,{0xb6,0x61,0x00,0xaa,0x00,0x4c,0xd6,0xd8} };

    87   if (aGuidService == IID_ISimpleDOMNode ||

    88       aGuidService == IID_SimpleDOMDeprecated ||

    89       aGuidService == IID_IAccessible ||  aGuidService == IID_IAccessible2)

    90     return mAccessible->QueryInterface(aIID, aInstancePtr);

    92   return E_INVALIDARG;

    93 }

    95 } // namespace a11y

    96 } // namespace mozilla

The Tor Browser / file revision

accessible/src/windows/msaa/ServiceProvider.cpp@97036ab72558

accessible/src/windows/msaa/ServiceProvider.cpp