content/shell/tools/plugin/Tests/NullNPPGetValuePointer.cpp

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /*
   6  * Copyright (C) 2010 Apple Inc. All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
  18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
  19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
  21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  27  * THE POSSIBILITY OF SUCH DAMAGE.
  28  */
  29
  30 #include "PluginTest.h"
  31
  32 #include "PluginObject.h"
  33
  34 using namespace std;
  35
  36 // Passing null for our NPP_GetValue function pointer should not crash.
  37
  38 class NullNPPGetValuePointer : public PluginTest {
  39 public:
  40     NullNPPGetValuePointer(NPP, const string& identifier);
  41
  42 private:
  43  NPError NPP_Destroy(NPSavedData**) override;
  44  NPError NPP_GetValue(NPPVariable, void* value) override;
  45
  46     NPP_GetValueProcPtr m_originalNPPGetValuePointer;
  47 };
  48
  49 static PluginTest::Register<NullNPPGetValuePointer> registrar("null-npp-getvalue-pointer");
  50
  51 NullNPPGetValuePointer::NullNPPGetValuePointer(NPP npp, const string& identifier)
  52     : PluginTest(npp, identifier)
  53     , m_originalNPPGetValuePointer(pluginFunctions->getvalue)
  54 {
  55     // Be sneaky and null out the getvalue pointer the browser is holding. This simulates a plugin
  56     // that doesn't implement NPP_GetValue (like Shockwave Director 10.3 on Windows). Note that if
  57     // WebKit copies the NPPluginFuncs struct this technique will have no effect and WebKit will
  58     // call into our NPP_GetValue implementation.
  59     pluginFunctions->getvalue = 0;
  60 }
  61
  62 NPError NullNPPGetValuePointer::NPP_Destroy(NPSavedData**)
  63 {
  64     // Set the NPP_GetValue pointer back the way it was before we mucked with it so we don't mess
  65     // up future uses of the plugin module.
  66     pluginFunctions->getvalue = m_originalNPPGetValuePointer;
  67     return NPERR_NO_ERROR;
  68 }
  69
  70 NPError NullNPPGetValuePointer::NPP_GetValue(NPPVariable, void*)
  71 {
  72     pluginLog(m_npp, "NPP_GetValue was called but should not have been. Maybe WebKit copied the NPPluginFuncs struct, which would invalidate this test.");
  73     return NPERR_GENERIC_ERROR;
  74 }