Initial import

git-svn-id: http://moon:8086/svn/software/trunk/libsrc/asiosdk2@1 b431acfa-c32f-4a4a-93f1-934dc6c82436
2014-07-19 07:44:42 +00:00
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+//==========================================================================;
+//
+//  THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
+//  KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+//  IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
+//  PURPOSE.
+//
+//  Copyright (c) 1992 - 1996  Microsoft Corporation.  All Rights Reserved.
+//
+//--------------------------------------------------------------------------;
+
+// Base class hierachy for creating COM objects, December 1994
+
+#include <windows.h>
+#include "wxdebug.h"
+#include "combase.h"
+#pragma warning( disable : 4514 )   // Disable warnings re unused inline functions
+
+
+/* Define the static member variable */
+
+LONG CBaseObject::m_cObjects = 0;
+
+
+/* Constructor */
+
+CBaseObject::CBaseObject(TCHAR *pName)
+{
+    /* Increment the number of active objects */
+    InterlockedIncrement(&m_cObjects);
+
+#ifdef DEBUG
+    m_dwCookie = DbgRegisterObjectCreation(pName);
+#endif
+}
+
+
+/* Destructor */
+
+CBaseObject::~CBaseObject()
+{
+    /* Decrement the number of objects active */
+    InterlockedDecrement(&m_cObjects);
+
+#ifdef DEBUG
+    DbgRegisterObjectDestruction(m_dwCookie);
+#endif
+}
+
+
+/* Constructor */
+
+// We know we use "this" in the initialization list, we also know we don't modify *phr.
+#pragma warning( disable : 4355 4100 ) 
+CUnknown::CUnknown(TCHAR *pName, LPUNKNOWN pUnk, HRESULT *phr) 
+: CBaseObject(pName)
+/* Start the object with a reference count of zero - when the      */
+/* object is queried for it's first interface this may be          */
+/* incremented depending on whether or not this object is          */
+/* currently being aggregated upon                                 */
+, m_cRef(0)
+/* Set our pointer to our IUnknown interface.                      */
+/* If we have an outer, use its, otherwise use ours.               */
+/* This pointer effectivly points to the owner of                  */
+/* this object and can be accessed by the GetOwner() method.       */
+, m_pUnknown( pUnk != 0 ? pUnk : reinterpret_cast<LPUNKNOWN>( static_cast<PNDUNKNOWN>(this) ) )
+ /* Why the double cast?  Well, the inner cast is a type-safe cast */
+ /* to pointer to a type from which we inherit.  The second is     */
+ /* type-unsafe but works because INonDelegatingUnknown "behaves   */
+ /* like" IUnknown. (Only the names on the methods change.)        */
+{
+    // Everything we need to do has been done in the initializer list
+}
+#pragma warning( default : 4355 4100 ) 
+
+/* QueryInterface */
+
+STDMETHODIMP CUnknown::NonDelegatingQueryInterface(REFIID riid, void ** ppv)
+{
+    CheckPointer(ppv,E_POINTER);
+    ValidateReadWritePtr(ppv,sizeof(PVOID));
+
+    /* We know only about IUnknown */
+
+    if (riid == IID_IUnknown) {
+        GetInterface((LPUNKNOWN) (PNDUNKNOWN) this, ppv);
+        return NOERROR;
+    } else {
+        *ppv = NULL;
+        return E_NOINTERFACE;
+    }
+}
+
+/* We have to ensure that we DON'T use a max macro, since these will typically   */
+/* lead to one of the parameters being evaluated twice.  Since we are worried    */
+/* about concurrency, we can't afford to access the m_cRef twice since we can't  */
+/* afford to run the risk that its value having changed between accesses.        */
+#ifdef max
+    #undef max
+#endif
+
+template<class T> inline static T max( const T & a, const T & b )
+{
+    return a > b ? a : b;
+}
+
+/* AddRef */
+
+STDMETHODIMP_(ULONG) CUnknown::NonDelegatingAddRef()
+{
+    LONG lRef = InterlockedIncrement( &m_cRef );
+    ASSERT(lRef > 0);
+    DbgLog((LOG_MEMORY,3,TEXT("    Obj %d ref++ = %d"),
+           m_dwCookie, m_cRef));
+    return max(ULONG(m_cRef), 1ul);
+}
+
+
+
+/* Release */
+
+STDMETHODIMP_(ULONG) CUnknown::NonDelegatingRelease()
+{
+    /* If the reference count drops to zero delete ourselves */
+
+    LONG lRef = InterlockedDecrement( &m_cRef );
+    ASSERT(lRef >= 0);
+
+    DbgLog((LOG_MEMORY,3,TEXT("    Object %d ref-- = %d"),
+	    m_dwCookie, m_cRef));
+    if (lRef == 0) {
+
+        // COM rules say we must protect against re-entrancy.
+        // If we are an aggregator and we hold our own interfaces
+        // on the aggregatee, the QI for these interfaces will
+        // addref ourselves. So after doing the QI we must release
+        // a ref count on ourselves. Then, before releasing the
+        // private interface, we must addref ourselves. When we do
+        // this from the destructor here it will result in the ref
+        // count going to 1 and then back to 0 causing us to
+        // re-enter the destructor. Hence we add an extra refcount here
+        // once we know we will delete the object.
+        // for an example aggregator see filgraph\distrib.cpp.
+
+        m_cRef++;
+
+        delete this;
+        return ULONG(0);
+    } else {
+        return max(ULONG(m_cRef), 1ul);
+    }
+}
+
+
+/* Return an interface pointer to a requesting client
+   performing a thread safe AddRef as necessary */
+
+HRESULT CUnknown::GetInterface(LPUNKNOWN pUnk, void **ppv)
+{
+    CheckPointer(ppv, E_POINTER);
+    *ppv = pUnk;
+    pUnk->AddRef();
+    return NOERROR;
+}
+
+
+/* Compares two interfaces and returns TRUE if they are on the same object */
+
+BOOL IsEqualObject(IUnknown *pFirst, IUnknown *pSecond)
+{
+    /*  Different objects can't have the same interface pointer for
+        any interface
+    */
+    if (pFirst == pSecond) {
+        return TRUE;
+    }
+    /*  OK - do it the hard way - check if they have the same
+        IUnknown pointers - a single object can only have one of these
+    */
+    LPUNKNOWN pUnknown1;     // Retrieve the IUnknown interface
+    LPUNKNOWN pUnknown2;     // Retrieve the other IUnknown interface
+    HRESULT hr;              // General OLE return code
+
+    ASSERT(pFirst);
+    ASSERT(pSecond);
+
+    /* See if the IUnknown pointers match */
+
+    hr = pFirst->QueryInterface(IID_IUnknown,(void **) &pUnknown1);
+    ASSERT(SUCCEEDED(hr));
+    ASSERT(pUnknown1);
+
+    hr = pSecond->QueryInterface(IID_IUnknown,(void **) &pUnknown2);
+    ASSERT(SUCCEEDED(hr));
+    ASSERT(pUnknown2);
+
+    /* Release the extra interfaces we hold */
+
+    pUnknown1->Release();
+    pUnknown2->Release();
+    return (pUnknown1 == pUnknown2);
+}