TEST_F(ContextMapTest, VerifyWithThreadsPathological) {
ContextMap<size_t> mp;
// Context collection and exit race threads:
vector<std::shared_ptr<CoreContext>> contexts;
// Exit race controller:
AutoRequired<ExitRaceSignal> signal;
// Create a number of dependent contexts:
for(size_t i = 0; i < 100; i++) {
AutoCreateContext context;
contexts.push_back(context);
// Store a shared pointer
mp.Add(i, context);
// Start the context
context->Initiate();
}
// Set the signal:
signal->Signal();
// Verify that the map empties once our zero-count is hit:
for(size_t i = 0; i < contexts.size(); i++) {
contexts[i]->SignalShutdown(true);
}
// Clear the context collection:
contexts.clear();
EXPECT_EQ(0UL, mp.size()) << "Context map did not empty as expected";
}
TEST_F(ContextMapTest, ConcurrentDestructionTestPathological) {
for(size_t i = 0; i < 100; i++) {
// Create our map and a few contexts:
ContextMap<string> mp;
AutoCreateContext contexts[4];
weak_ptr<SimpleThreaded> threads[4];
// Insert into the map:
mp.Add("pathological_destruction0", contexts[0]);
mp.Add("pathological_destruction1", contexts[1]);
mp.Add("pathological_destruction2", contexts[2]);
mp.Add("pathological_destruction3", contexts[3]);
// Add a thread and kick off the context:
for(size_t i = ARRAYCOUNT(contexts); i--;) {
threads[i] = contexts[i]->Inject<SimpleThreaded>();
contexts[i]->Initiate();
}
// Immediately tear contexts down:
for(size_t i = ARRAYCOUNT(contexts); i--;)
contexts[i]->SignalShutdown();
// Wait on anything not signalled:
for(size_t i = 0; i < ARRAYCOUNT(threads); i++) {
auto cur = threads[i].lock();
if(cur)
ASSERT_TRUE(cur->WaitFor(std::chrono::seconds(1))) << "Spawned thread did not exit in a timely fashion";
}
}
}
TEST_F(ContextMapTest, VerifySimpleEnumeration) {
ContextMap<string> mp;
AutoCreateContext ctxt1;
AutoCreateContext ctxt2;
AutoCreateContext ctxt3;
mp.Add("context_se_1", ctxt1);
mp.Add("context_se_2", ctxt2);
mp.Add("context_se_3", ctxt3);
std::set<std::string> found;
size_t count = 0;
mp.Enumerate(
[&count, &found] (const string& name, std::shared_ptr<CoreContext>& ctxt) -> bool {
count++;
found.insert(name);
return true;
}
);
EXPECT_EQ(3UL, count) << "Failed to enumerate all expected context pointers";
EXPECT_EQ(1UL, found.count("context_se_1")) << "Failed to find map element '1'";
EXPECT_EQ(1UL, found.count("context_se_2")) << "Failed to find map element '2'";
EXPECT_EQ(1UL, found.count("context_se_3")) << "Failed to find map element '3'";
}
// Fetches a previously constructed context by name.
Context* GetContext(const String& name)
{
ContextMap::iterator i = contexts.find(name);
if (i == contexts.end())
return NULL;
return (*i).second;
}
CQueue::OnCreateFile(
/*[in]*/ IWDFIoQueue* pQueue,
/*[in]*/ IWDFIoRequest* pRequest,
/*[in]*/ IWDFFile* pFileObject
)
{
UNREFERENCED_PARAMETER(pQueue);
TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_FLAG_QUEUE, "%!FUNC! Entry");
// This critical section protects the section of code where we
// Create the serializer and results interfaces used in handling I/O messages.
// We only need to create them once, then we hang on to them for the lifetime of this
// queue object.
CComCritSecLock<CComAutoCriticalSection> Lock(m_CriticalSection);
HRESULT hr = S_OK;
// Create the WPD serializer
if ((hr == S_OK) &&
(m_pWpdSerializer == NULL))
{
hr = CoCreateInstance(CLSID_WpdSerializer,
NULL,
CLSCTX_INPROC_SERVER,
IID_IWpdSerializer,
(VOID**)&m_pWpdSerializer);
CHECK_HR(hr, "Failed to CoCreate CLSID_WpdSerializer");
}
// Create the client context map and associate it with the File Object
// so we can obtain it on a per-client basis.
if (hr == S_OK)
{
ContextMap* pClientContextMap = new ContextMap();
if(pClientContextMap != NULL)
{
hr = pFileObject->AssignContext(this, (void*)pClientContextMap);
CHECK_HR(hr, "Failed to set client context map");
// Release the client context map if we cannot set it
// properly
if(FAILED(hr))
{
pClientContextMap->Release();
pClientContextMap = NULL;
}
}
else
{
hr = E_OUTOFMEMORY;
CHECK_HR(hr, "Failed to create client context map");
}
}
pRequest->Complete(hr);
return;
}
TEST_F(ContextMapTest, VerifyWithThreads) {
ContextMap<string> mp;
std::shared_ptr<SimpleThreaded> threaded;
std::weak_ptr<CoreContext> weakContext;
{
AutoCreateContext context;
// Obtain a weak pointer of our own, and add to the context:
weakContext = context;
mp.Add("context_withthreads", context);
// Add a thread to hold the context open for awhile:
threaded = context->Inject<SimpleThreaded>();
// Start the context
context->Initiate();
}
// Assert that the context still actually exists:
ASSERT_TRUE(!weakContext.expired()) << "Simple thread exited before it was signalled to exit";
{
// Verify that we can still find the context while the thread is alive:
std::shared_ptr<CoreContext> context = mp.Find("context_withthreads");
ASSERT_TRUE(!!context.get()) << "Map evicted a context before expected";
// Relock the weak context, verify that we get back the same pointer:
auto relocked = weakContext.lock();
EXPECT_EQ(relocked, context) << "Mapped context pointer was not identical to a previously stored context pointer";
// Terminate whole context
context->SignalTerminate();
}
// Release our threaded entity:
threaded.reset();
{
// Verify that the context is gone now that everything in it has stopped running
auto ctxt = mp.Find("context_withthreads");
EXPECT_FALSE(ctxt) << "Context was not properly evicted from the map";
// Just return early if the context was empty as we expected, the next part of this test is for diagnostics
if(!ctxt)
return;
// Release the pointer so we aren't guilty of holding a reference to the very thing whose
// destruction we are trying to assure.
ctxt.reset();
// Sleep for a little bit and run the verification again. If the prior expectation fails,
// but this one succeeds, it could be due to race conditions in CoreThread
std::this_thread::sleep_for(std::chrono::milliseconds(10));
ctxt = mp.Find("context_withthreads");
EXPECT_FALSE(ctxt) << "Context was not properly evicted even after waiting for a time to ensure eviction";
}
}
void KJavaServerMaintainer::releaseContext(QObject *w, const QString &doc)
{
ContextMap::iterator it = m_contextmap.find(qMakePair(w, doc));
if(it != m_contextmap.end() && --(*it).second <= 0)
{
kdDebug(6100) << "KJavaServerMaintainer::releaseContext" << endl;
(*it).first->deleteLater();
m_contextmap.remove(it);
}
}
static void retrace_glXDestroyContext(trace::Call &call) {
ContextMap::iterator it;
it = context_map.find(call.arg(1).toUIntPtr());
if (it == context_map.end()) {
return;
}
it->second->release();
context_map.erase(it);
}
static Context *
getContext(unsigned long long context_ptr) {
if (context_ptr == 0) {
return NULL;
}
ContextMap::const_iterator it;
it = context_map.find(context_ptr);
return (it != context_map.end()) ? it->second : NULL;
}
TEST_F(ContextMapTest, OutOfOrderDeletionTest) {
try {
AutoCreateContext controlled;
ContextMap<size_t> mp;
// Add the current context to the map:
mp.Add(1, controlled);
// Map is destroyed first, then the enclosed context--no exceptions should be thrown
} catch(...) {
FAIL() << "Exception thrown while attempting an out-of-order teardown";
}
}
static void retrace_wglDeleteContext(trace::Call &call) {
unsigned long long hglrc = call.arg(0).toUIntPtr();
ContextMap::iterator it;
it = context_map.find(hglrc);
if (it == context_map.end()) {
return;
}
it->second->release();
context_map.erase(it);
}
KJavaAppletContext *KJavaServerMaintainer::getContext(QObject *w, const QString &doc)
{
ContextMap::key_type key = qMakePair(w, doc);
ContextMap::iterator it = m_contextmap.find(key);
if(it != m_contextmap.end())
{
++((*it).second);
return (*it).first;
}
KJavaAppletContext *const context = new KJavaAppletContext();
m_contextmap.insert(key, qMakePair(context, 1));
return context;
}
static Context *
getContext(unsigned long long context_ptr) {
if (context_ptr == 0) {
return NULL;
}
ContextMap::const_iterator it;
it = context_map.find(context_ptr);
if (it == context_map.end()) {
return (context_map[context_ptr] = glretrace::createContext());
}
return it->second;
}
static glws::Context *
getContext(unsigned long long context_ptr) {
if (context_ptr == 0) {
return NULL;
}
ContextMap::const_iterator it;
it = context_map.find(context_ptr);
if (it == context_map.end()) {
return (context_map[context_ptr] = ws->createContext(visual, NULL));
}
return it->second;
}
static void retrace_eglDestroyContext(trace::Call &call) {
unsigned long long orig_context = call.arg(1).toUIntPtr();
ContextMap::iterator it;
it = context_map.find(orig_context);
if (it != context_map.end()) {
glretrace::Context *currentContext = glretrace::getCurrentContext();
if (it->second != currentContext) {
// TODO: reference count
delete it->second;
}
context_map.erase(it);
}
}
static Context *
getContext(unsigned long long context_ptr) {
if (context_ptr == 0) {
return NULL;
}
ContextMap::const_iterator it;
it = context_map.find(context_ptr);
if (it == context_map.end()) {
assert(false);
return NULL;
}
return it->second;
}
CQueue::OnCleanup(
IWDFObject* pWdfObject
)
{
// Destroy the client context map
HRESULT hr = S_OK;
ContextMap* pClientContextMap = NULL;
hr = pWdfObject->RetrieveContext((void**)&pClientContextMap);
if((hr == S_OK) && (pClientContextMap != NULL))
{
pClientContextMap->Release();
pClientContextMap = NULL;
}
}
static void retrace_CGLDestroyContext(trace::Call &call) {
if (call.ret->toUInt() != kCGLNoError) {
return;
}
unsigned long long ctx = call.arg(0).toUIntPtr();
ContextMap::iterator it;
it = context_map.find(ctx);
if (it == context_map.end()) {
return;
}
delete it->second;
context_map.erase(it);
}
CQueue::OnCleanup(
IWDFObject* pWdfObject
)
{
TraceEvents(TRACE_LEVEL_INFORMATION, TRACE_FLAG_QUEUE, "%!FUNC! Entry");
// Destroy the client context map
HRESULT hr = S_OK;
ContextMap* pClientContextMap = NULL;
hr = pWdfObject->RetrieveContext((void**)&pClientContextMap);
if((hr == S_OK) && (pClientContextMap != NULL))
{
pClientContextMap->Release();
pClientContextMap = NULL;
}
}
TEST_F(ContextMapTest, AdjacentCleanupTest) {
ContextMap<string> mp;
std::weak_ptr<CoreContext> outerWeak;
std::weak_ptr<CoreContext> innerWeak;
// Add two contexts, and let one go out of scope
AutoCreateContext outer;
mp.Add("0", outer);
outerWeak = outer;
{
AutoCreateContext inner;
mp.Add("1", inner);
innerWeak = inner;
// Verify that we can find both contexts
std::shared_ptr<CoreContext> outerSearched = mp.Find("0");
ASSERT_TRUE(!!outerSearched.get()) << "Outer context just added, but couldn't be found";
std::shared_ptr<CoreContext> innerSearched = mp.Find("1");
ASSERT_TRUE(!!innerSearched.get()) << "Inner context just added, but couldn't be found";
}
// Inner should be 404 by now
ASSERT_TRUE(innerWeak.expired()) << "Unexpected outstanding reference to the inner context";
// Try to find the outer context. This should evict the inner context.
mp.Find("0");
ASSERT_EQ(1UL, mp.size()) << "Proximity eviction didn't function as expected";
}
/**
* This method is called when we receive a WPD_COMMAND_OBJECT_RESOURCES_CLOSE
* command.
*
* The parameters sent to us are:
* - WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT: the context the driver returned to
* the client in OnOpenResource.
*
* The driver should:
* - Destroy any data associated with this context.
*/
HRESULT WpdObjectResources::OnCloseResource(
_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults)
{
HRESULT hr = S_OK;
LPWSTR wszResourceContext = NULL;
ContextMap* pContextMap = NULL;
UNREFERENCED_PARAMETER(pResults);
// First get ALL parameters for this command. If we cannot get ALL parameters
// then E_INVALIDARG should be returned and no further processing should occur.
// Get the resource context identifier for this resource operation. We will
// need this to lookup the specific resource context in the client context map.
hr = pParams->GetStringValue(WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT, &wszResourceContext);
if (hr != S_OK)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT");
}
// Get the client context map so we can retrieve the resource context for this resource
// operation using the WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT property value obtained above.
if (hr == S_OK)
{
hr = pParams->GetIUnknownValue(PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP, (IUnknown**)&pContextMap);
CHECK_HR(hr, "Failed to get PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP");
}
// Destroy any data allocated/associated with the resource context and then remove it from the context map.
// We no longer need to keep this context around because the resource operation has been ended.
if (hr == S_OK)
{
pContextMap->Remove(wszResourceContext);
}
// Free the memory. CoTaskMemFree ignores NULLs so no need to check.
CoTaskMemFree(wszResourceContext);
SAFE_RELEASE(pContextMap);
return hr;
}
/**
* This method is called when we receive a WPD_COMMAND_OBJECT_ENUMERATION_END_FIND
* command.
*
* The parameters sent to us are:
* - WPD_PROPERTY_OBJECT_ENUMERATION_CONTEXT: the context the driver returned to
* the client in OnStartFind.
*
* The driver should:
* - Destroy any data associated with this context.
*/
HRESULT WpdObjectEnumerator::OnEndFind(
_In_ IPortableDeviceValues* pParams,
_Inout_ IPortableDeviceValues* pResults)
{
HRESULT hr = S_OK;
LPWSTR wszEnumContext = NULL;
ContextMap* pContextMap = NULL;
UNREFERENCED_PARAMETER(pResults);
// First get ALL parameters for this command. If we cannot get ALL parameters
// then E_INVALIDARG should be returned and no further processing should occur.
// Get the enumeration context identifier for this enumeration operation. We will
// need this to lookup the specific enumeration context in the client context map.
hr = pParams->GetStringValue(WPD_PROPERTY_OBJECT_ENUMERATION_CONTEXT, &wszEnumContext);
if (hr != S_OK)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_ENUMERATION_CONTEXT");
}
// Get the client context map so we can retrieve the enumeration context for this enumeration
// operation using the WPD_PROPERTY_OBJECT_ENUMERATION_CONTEXT property value obtained above.
if (hr == S_OK)
{
hr = GetClientContextMap(pParams, &pContextMap);
CHECK_HR(hr, "Failed to get the client context map");
}
// Destroy any data allocated/associated with the enumeration context and then remove it from the context map.
// We no longer need to keep this context around because the enumeration has been ended.
if (hr == S_OK)
{
pContextMap->Remove(wszEnumContext);
}
// Free the memory. CoTaskMemFree ignores NULLs so no need to check.
CoTaskMemFree(wszEnumContext);
SAFE_RELEASE(pContextMap);
return hr;
}
// Fetches a context by index.
Context* GetContext(int index)
{
ContextMap::iterator i = contexts.begin();
int count = 0;
if (index >= GetNumContexts())
index = GetNumContexts() - 1;
while (count < index)
{
++i;
++count;
}
if (i == contexts.end())
return NULL;
return (*i).second;
}
static Context *
getContext(unsigned long long ctx) {
if (ctx == 0) {
return NULL;
}
ContextMap::const_iterator it;
it = context_map.find(ctx);
if (it == context_map.end()) {
Context *context;
context_map[ctx] = context = glretrace::createContext(sharedContext);
if (!sharedContext) {
sharedContext = context;
}
return context;
}
return it->second;
}
void Shutdown()
{
// Notify all plugins we're being shutdown.
PluginRegistry::Instance()->NotifyShutdown();
// Release all remaining contexts.
for (ContextMap::iterator itr = contexts.begin(); itr != contexts.end(); ++itr)
Core::Log::Message(Log::LT_WARNING, "Context '%s' still active on shutdown.", (*itr).first.CString());
contexts.clear();
TemplateCache::Shutdown();
StyleSheetFactory::Shutdown();
StyleSheetSpecification::Shutdown();
FontDatabase::Shutdown();
TextureDatabase::Shutdown();
Factory::Instance()->Shutdown();
Factory::DestroyInstance();
Log::Shutdown();
PluginRegistry::DestroyInstance();
PropertyParserColour::DestroyInstance();
PropCounterSingleton::DestroyInstance();
initialised = false;
if (render_interface != NULL)
render_interface->RemoveReference();
if (file_interface != NULL)
file_interface->RemoveReference();
if (system_interface != NULL)
system_interface->RemoveReference();
render_interface = NULL;
file_interface = NULL;
system_interface = NULL;
}
TEST_F(ContextMapTest, VerifySimple) {
ContextMap<string> mp;
// Create a new context and add it to the map:
{
AutoCreateContext context;
// Verify the reference count or the rest of the test will fail
ASSERT_EQ(context.use_count(), 1) << "A newly created context's use count isn't what was expected";
// Add and ensure the reference count is unmodified
mp.Add("context_simple", context);
ASSERT_EQ(context.use_count(), 1) << "The map altered the context use count";
// We should be able to find this context now:
std::shared_ptr<CoreContext> found = mp.Find("context_simple");
EXPECT_TRUE(!!found.get()) << "Failed to find a context that was just inserted into a context map";
}
// We shouldn't be able to find it now that it's gone out of scope:
std::shared_ptr<CoreContext> notFound = mp.Find("context_simple");
EXPECT_FALSE(!!notFound.get()) << "Context was not evicted as expected when it went out of scope";
}
int map_main(int argc, char* argv[]) {
ContextMap *context = new ContextMap();
if (!context->parseCmdArgs(argc, argv, 1) || context->getShowHelp() || !context->isValidState()) {
if (!context->getErrorMsg().empty()) {
cerr << context->getErrorMsg() << endl;
}
map_help();
delete context;
return 0;
}
FileMap *fileMap = new FileMap(context);
bool retVal = fileMap->mapFiles();
delete fileMap;
delete context;
return retVal ? 0 : 1;
}
/**
* This method is called when we receive a WPD_COMMAND_OBJECT_RESOURCES_READ
* command.
*
* The parameters sent to us are:
* - WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT: the context the driver returned to
* the client in OnOpenResource.
* - WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_TO_READ: the number of bytes to
* read from the resource.
*
* The driver should:
* - Read data associated with the resource and return it back to the caller in
* WPD_PROPERTY_OBJECT_RESOURCES_DATA.
* - Report the number of bytes actually read from the resource in
* WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_READ. This number may be smaller
* than WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_TO_READ when reading the last
* chunk of data from the resource.
*/
HRESULT WpdObjectResources::OnReadResource(
_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults)
{
HRESULT hr = S_OK;
LPWSTR wszResourceContext = NULL;
DWORD dwNumBytesToRead = 0;
DWORD dwNumBytesRead = 0;
BYTE* pBuffer = NULL;
DWORD cbBuffer = 0;
WpdObjectResourceContext* pResourceContext = NULL;
ContextMap* pContextMap = NULL;
// Get the enumeration context identifier for this enumeration operation. We will
// need this to lookup the specific enumeration context in the client context map.
hr = pParams->GetStringValue(WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT, &wszResourceContext);
if (hr != S_OK)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT");
}
// Get the number of bytes to read
if (hr == S_OK)
{
hr = pParams->GetUnsignedIntegerValue(WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_TO_READ, &dwNumBytesToRead);
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_TO_READ");
}
// Get the destination buffer
if (hr == S_OK)
{
hr = pParams->GetBufferValue(WPD_PROPERTY_OBJECT_RESOURCES_DATA, &pBuffer, &cbBuffer);
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_DATA");
}
// Get the client context map so we can retrieve the resource context for this resource
// operation using the WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT property value obtained above.
if (hr == S_OK)
{
hr = pParams->GetIUnknownValue(PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP, (IUnknown**)&pContextMap);
CHECK_HR(hr, "Failed to get PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP");
}
if (hr == S_OK)
{
pResourceContext = (WpdObjectResourceContext*)pContextMap->GetContext(wszResourceContext);
if (pResourceContext == NULL)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Missing resource context");
}
}
// Read the next chunk of data for this request
if (hr == S_OK && pBuffer != NULL)
{
hr = ReadDataFromResource(pResourceContext, pBuffer, dwNumBytesToRead, &dwNumBytesRead);
CHECK_HR(hr, "Failed to read %d bytes from resource", dwNumBytesToRead);
}
if (hr == S_OK && pBuffer != NULL)
{
hr = pResults->SetBufferValue(WPD_PROPERTY_OBJECT_RESOURCES_DATA, pBuffer, dwNumBytesRead);
CHECK_HR(hr, "Failed to set WPD_PROPERTY_OBJECT_RESOURCES_DATA");
}
if (hr == S_OK)
{
hr = pResults->SetUnsignedIntegerValue(WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_READ, dwNumBytesRead);
CHECK_HR(hr, "Failed to set WPD_PROPERTY_OBJECT_RESOURCES_NUM_BYTES_READ");
}
// Free the memory. CoTaskMemFree ignores NULLs so no need to check.
CoTaskMemFree(wszResourceContext);
// Free the memory. CoTaskMemFree ignores NULLs so no need to check.
CoTaskMemFree(pBuffer);
SAFE_RELEASE(pContextMap);
return hr;
}
/**
* This method is called when we receive a WPD_COMMAND_OBJECT_RESOURCES_OPEN
* command.
*
* The parameters sent to us are:
* - WPD_PROPERTY_OBJECT_RESOURCES_OBJECT_ID: the object identifier of the
* object which contains the specified resource
*
* - WPD_PROPERTY_OBJECT_RESOURCES_RESOURCE_KEYS: the specified resource
* to open
*
* - WPD_PROPERTY_OBJECT_RESOURCES_ACCESS_MODE: the access mode to which to
* open the specified resource
*
* The driver should:
* - Create a new context for this resource operation.
* - Return an identifier for the context in WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT.
* - Set the optimal transfer size in WPD_PROPERTY_OBJECT_RESOURCES_OPTIMAL_TRANSFER_BUFFER_SIZE
*
*/
HRESULT WpdObjectResources::OnOpenResource(
_In_ IPortableDeviceValues* pParams,
_In_ IPortableDeviceValues* pResults)
{
HRESULT hr = S_OK;
LPWSTR wszObjectID = NULL;
PROPERTYKEY Key = WPD_PROPERTY_NULL;
DWORD dwMode = STGM_READ;
CAtlStringW strStrObjectID;
CAtlStringW strResourceContext;
ContextMap* pContextMap = NULL;
// Get the Object identifier of the object which contains the specified resource
hr = pParams->GetStringValue(WPD_PROPERTY_OBJECT_RESOURCES_OBJECT_ID, &wszObjectID);
if (hr != S_OK)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_OBJECT_ID");
}
// Get the resource key
if (hr == S_OK)
{
hr = pParams->GetKeyValue(WPD_PROPERTY_OBJECT_RESOURCES_RESOURCE_KEYS, &Key);
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_RESOURCE_KEYS");
}
// Get the access mode
if (hr == S_OK)
{
hr = pParams->GetUnsignedIntegerValue(WPD_PROPERTY_OBJECT_RESOURCES_ACCESS_MODE, &dwMode);
CHECK_HR(hr, "Missing value for WPD_PROPERTY_OBJECT_RESOURCES_ACCESS_MODE");
}
// Validate whether the params given to us are correct. In this case, we need to check that the object
// supports the resource requested, and can be opened in the requested access mode.
if (hr == S_OK)
{
// In this sample, we only have one object (README_FILE_OBJECT_ID) which supports a
// resource (WPD_RESOURCE_DEFAULT) for reading only.
// So if any other Object ID or any other resource is specified, it must be invalid.
strStrObjectID = wszObjectID;
if(strStrObjectID.CompareNoCase(README_FILE_OBJECT_ID) != 0)
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Object [%ws] does not support resources", wszObjectID);
}
if (hr == S_OK)
{
if (!IsEqualPropertyKey(Key, WPD_RESOURCE_DEFAULT))
{
hr = E_INVALIDARG;
CHECK_HR(hr, "Only WPD_RESOURCE_DEFAULT is supported in this sample driver");
}
}
if (hr == S_OK)
{
if ((dwMode & STGM_WRITE) != 0)
{
hr = E_ACCESSDENIED;
CHECK_HR(hr, "This resource is not available for write access");
}
}
}
// Get the context map which the driver stored in pParams for convenience
if (hr == S_OK)
{
hr = pParams->GetIUnknownValue(PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP, (IUnknown**)&pContextMap);
CHECK_HR(hr, "Failed to get PRIVATE_SAMPLE_DRIVER_CLIENT_CONTEXT_MAP");
}
// Create a new resource operation context, initialize it, and add it to the client context map.
if (hr == S_OK)
{
WpdObjectResourceContext* pResourceContext = new WpdObjectResourceContext();
if (pResourceContext != NULL)
{
// Initialize the resource context with ...
pResourceContext->m_strObjectID = wszObjectID;
pResourceContext->m_Resource = Key;
pResourceContext->m_BytesTransferred = 0;
pResourceContext->m_BytesTotal = GetObjectSize(wszObjectID);
// Add the resource context to the context map
pContextMap->Add(pResourceContext, strResourceContext);
// Release the resource context because it has been AddRef'ed during Add()
SAFE_RELEASE(pResourceContext);
}
else
{
hr = E_OUTOFMEMORY;
CHECK_HR(hr, "Failed to allocate resource context");
}
}
if (hr == S_OK)
{
hr = pResults->SetStringValue(WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT, strResourceContext);
CHECK_HR(hr, "Failed to set WPD_PROPERTY_OBJECT_RESOURCES_CONTEXT");
}
// Set the optimal buffer size
if (hr == S_OK)
{
hr = pResults->SetUnsignedIntegerValue(WPD_PROPERTY_OBJECT_RESOURCES_OPTIMAL_TRANSFER_BUFFER_SIZE, FILE_OPTIMAL_READ_BUFFER_SIZE_VALUE);
CHECK_HR(hr, "Failed to set WPD_PROPERTY_OBJECT_RESOURCES_OPTIMAL_TRANSFER_BUFFER_SIZE value");
}
// Free the memory. CoTaskMemFree ignores NULLs so no need to check.
CoTaskMemFree(wszObjectID);
SAFE_RELEASE(pContextMap);
return hr;
}
virtual void OnContextDestroy(Context* context)
{
contexts.erase(context->GetName());
}