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+/** @file
+ * MS COM / XPCOM Abstraction Layer - Safe array helper class declaration.
+ */
+
+/*
+ * Copyright (C) 2006-2022 Oracle and/or its affiliates.
+ *
+ * This file is part of VirtualBox base platform packages, as
+ * available from https://www.virtualbox.org.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation, in version 3 of the
+ * License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <https://www.gnu.org/licenses>.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
+ * in the VirtualBox distribution, in which case the provisions of the
+ * CDDL are applicable instead of those of the GPL.
+ *
+ * You may elect to license modified versions of this file under the
+ * terms and conditions of either the GPL or the CDDL or both.
+ *
+ * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
+ */
+
+#ifndef VBOX_INCLUDED_com_array_h
+#define VBOX_INCLUDED_com_array_h
+#ifndef RT_WITHOUT_PRAGMA_ONCE
+# pragma once
+#endif
+
+
+/** @defgroup grp_com_arrays COM/XPCOM Arrays
+ * @ingroup grp_com
+ * @{
+ *
+ * The COM/XPCOM array support layer provides a cross-platform way to pass
+ * arrays to and from COM interface methods and consists of the com::SafeArray
+ * template and a set of ComSafeArray* macros part of which is defined in
+ * VBox/com/defs.h.
+ *
+ * This layer works with interface attributes and method parameters that have
+ * the 'safearray="yes"' attribute in the XIDL definition:
+ * @code
+
+ <interface name="ISomething" ...>
+
+ <method name="testArrays">
+ <param name="inArr" type="long" dir="in" safearray="yes"/>
+ <param name="outArr" type="long" dir="out" safearray="yes"/>
+ <param name="retArr" type="long" dir="return" safearray="yes"/>
+ </method>
+
+ </interface>
+
+ * @endcode
+ *
+ * Methods generated from this and similar definitions are implemented in
+ * component classes using the following declarations:
+ * @code
+
+ STDMETHOD(TestArrays)(ComSafeArrayIn(LONG, aIn),
+ ComSafeArrayOut(LONG, aOut),
+ ComSafeArrayOut(LONG, aRet));
+
+ * @endcode
+ *
+ * And the following function bodies:
+ * @code
+
+ STDMETHODIMP Component::TestArrays(ComSafeArrayIn(LONG, aIn),
+ ComSafeArrayOut(LONG, aOut),
+ ComSafeArrayOut(LONG, aRet))
+ {
+ if (ComSafeArrayInIsNull(aIn))
+ return E_INVALIDARG;
+ if (ComSafeArrayOutIsNull(aOut))
+ return E_POINTER;
+ if (ComSafeArrayOutIsNull(aRet))
+ return E_POINTER;
+
+ // Use SafeArray to access the input array parameter
+
+ com::SafeArray<LONG> in(ComSafeArrayInArg(aIn));
+
+ for (size_t i = 0; i < in.size(); ++ i)
+ LogFlow(("*** in[%u]=%d\n", i, in[i]));
+
+ // Use SafeArray to create the return array (the same technique is used
+ // for output array parameters)
+
+ SafeArray<LONG> ret(in.size() * 2);
+ for (size_t i = 0; i < in.size(); ++ i)
+ {
+ ret[i] = in[i];
+ ret[i + in.size()] = in[i] * 10;
+ }
+
+ ret.detachTo(ComSafeArrayOutArg(aRet));
+
+ return S_OK;
+ }
+
+ * @endcode
+ *
+ * Such methods can be called from the client code using the following pattern:
+ * @code
+
+ ComPtr<ISomething> component;
+
+ // ...
+
+ com::SafeArray<LONG> in(3);
+ in[0] = -1;
+ in[1] = -2;
+ in[2] = -3;
+
+ com::SafeArray<LONG> out;
+ com::SafeArray<LONG> ret;
+
+ HRESULT rc = component->TestArrays(ComSafeArrayAsInParam(in),
+ ComSafeArrayAsOutParam(out),
+ ComSafeArrayAsOutParam(ret));
+
+ if (SUCCEEDED(rc))
+ for (size_t i = 0; i < ret.size(); ++ i)
+ printf("*** ret[%u]=%d\n", i, ret[i]);
+
+ * @endcode
+ *
+ * For interoperability with standard C++ containers, there is a template
+ * constructor that takes such a container as argument and performs a deep copy
+ * of its contents. This can be used in method implementations like this:
+ * @code
+
+ STDMETHODIMP Component::COMGETTER(Values)(ComSafeArrayOut(int, aValues))
+ {
+ // ... assume there is a |std::list<int> mValues| data member
+
+ com::SafeArray<int> values(mValues);
+ values.detachTo(ComSafeArrayOutArg(aValues));
+
+ return S_OK;
+ }
+
+ * @endcode
+ *
+ * The current implementation of the SafeArray layer supports all types normally
+ * allowed in XIDL as array element types (including 'wstring' and 'uuid').
+ * However, 'pointer-to-...' types (e.g. 'long *', 'wstring *') are not
+ * supported and therefore cannot be used as element types.
+ *
+ * Note that for GUID arrays you should use SafeGUIDArray and
+ * SafeConstGUIDArray, customized SafeArray<> specializations.
+ *
+ * Also note that in order to pass input BSTR array parameters declared
+ * using the ComSafeArrayIn(IN_BSTR, aParam) macro to the SafeArray<>
+ * constructor using the ComSafeArrayInArg() macro, you should use IN_BSTR
+ * as the SafeArray<> template argument, not just BSTR.
+ *
+ * Arrays of interface pointers are also supported but they require to use a
+ * special SafeArray implementation, com::SafeIfacePointer, which takes the
+ * interface class name as a template argument (e.g.
+ * com::SafeIfacePointer\<IUnknown\>). This implementation functions
+ * identically to com::SafeArray.
+ */
+
+#ifdef VBOX_WITH_XPCOM
+# include <nsMemory.h>
+#endif
+
+#include "VBox/com/defs.h"
+
+#if RT_GNUC_PREREQ(4, 6) || (defined(_MSC_VER) && (_MSC_VER >= 1600))
+/** @def VBOX_WITH_TYPE_TRAITS
+ * Type traits are a C++ 11 feature, so not available everywhere (yet).
+ * Only GCC 4.6 or newer and MSVC++ 16.0 (Visual Studio 2010) or newer.
+ */
+# define VBOX_WITH_TYPE_TRAITS
+#endif
+
+#ifdef VBOX_WITH_TYPE_TRAITS
+# include <type_traits>
+#endif
+
+#include "VBox/com/ptr.h"
+#include "VBox/com/assert.h"
+#include "iprt/cpp/list.h"
+
+/** @def ComSafeArrayAsInParam
+ * Wraps the given com::SafeArray instance to generate an expression that is
+ * suitable for passing it to functions that take input safearray parameters
+ * declared using the ComSafeArrayIn macro.
+ *
+ * @param aArray com::SafeArray instance to pass as an input parameter.
+ */
+
+/** @def ComSafeArrayAsOutParam
+ * Wraps the given com::SafeArray instance to generate an expression that is
+ * suitable for passing it to functions that take output safearray parameters
+ * declared using the ComSafeArrayOut macro.
+ *
+ * @param aArray com::SafeArray instance to pass as an output parameter.
+ */
+
+/** @def ComSafeArrayNullInParam
+ * Helper for passing a NULL array parameter to a COM / XPCOM method.
+ */
+
+#ifdef VBOX_WITH_XPCOM
+
+# define ComSafeArrayAsInParam(aArray) \
+ (PRUint32)(aArray).size(), (aArray).__asInParam_Arr((aArray).raw())
+
+# define ComSafeArrayAsOutParam(aArray) \
+ (aArray).__asOutParam_Size(), (aArray).__asOutParam_Arr()
+
+# define ComSafeArrayNullInParam() 0, NULL
+
+#else /* !VBOX_WITH_XPCOM */
+
+# define ComSafeArrayAsInParam(aArray) (aArray).__asInParam()
+
+# define ComSafeArrayAsOutParam(aArray) (aArray).__asOutParam()
+
+# define ComSafeArrayNullInParam() (NULL)
+
+#endif /* !VBOX_WITH_XPCOM */
+
+/**
+ *
+ */
+namespace com
+{
+
+/** Used for dummy element access in com::SafeArray, avoiding crashes. */
+extern const char Zeroes[16];
+
+
+#ifdef VBOX_WITH_XPCOM
+
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Provides various helpers for SafeArray.
+ *
+ * @param T Type of array elements.
+ */
+template<typename T>
+struct SafeArrayTraits
+{
+protected:
+
+ /** Initializes memory for aElem. */
+ static void Init(T &aElem) { aElem = (T)0; }
+
+ /** Initializes memory occupied by aElem. */
+ static void Uninit(T &aElem) { RT_NOREF(aElem); }
+
+ /** Creates a deep copy of aFrom and stores it in aTo. */
+ static void Copy(const T &aFrom, T &aTo) { aTo = aFrom; }
+
+public:
+
+ /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard (that
+ * in particular forbid casts of 'char **' to 'const char **'). Then initial
+ * reason for this magic is that XPIDL declares input strings
+ * (char/PRUnichar pointers) as const but doesn't do so for pointers to
+ * arrays. */
+ static T *__asInParam_Arr(T *aArr) { return aArr; }
+ static T *__asInParam_Arr(const T *aArr) { return const_cast<T *>(aArr); }
+};
+
+template<typename T>
+struct SafeArrayTraits<T *>
+{
+ // Arbitrary pointers are not supported
+};
+
+template<>
+struct SafeArrayTraits<PRUnichar *>
+{
+protected:
+
+ static void Init(PRUnichar * &aElem) { aElem = NULL; }
+
+ static void Uninit(PRUnichar * &aElem)
+ {
+ if (aElem)
+ {
+ ::SysFreeString(aElem);
+ aElem = NULL;
+ }
+ }
+
+ static void Copy(const PRUnichar * aFrom, PRUnichar * &aTo)
+ {
+ AssertCompile(sizeof(PRUnichar) == sizeof(OLECHAR));
+ aTo = aFrom ? ::SysAllocString((const OLECHAR *)aFrom) : NULL;
+ }
+
+public:
+
+ /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard */
+ static const PRUnichar **__asInParam_Arr(PRUnichar **aArr)
+ {
+ return const_cast<const PRUnichar **>(aArr);
+ }
+ static const PRUnichar **__asInParam_Arr(const PRUnichar **aArr) { return aArr; }
+};
+
+template<>
+struct SafeArrayTraits<const PRUnichar *>
+{
+protected:
+
+ static void Init(const PRUnichar * &aElem) { aElem = NULL; }
+ static void Uninit(const PRUnichar * &aElem)
+ {
+ if (aElem)
+ {
+ ::SysFreeString(const_cast<PRUnichar *>(aElem));
+ aElem = NULL;
+ }
+ }
+
+ static void Copy(const PRUnichar * aFrom, const PRUnichar * &aTo)
+ {
+ AssertCompile(sizeof(PRUnichar) == sizeof(OLECHAR));
+ aTo = aFrom ? ::SysAllocString((const OLECHAR *)aFrom) : NULL;
+ }
+
+public:
+
+ /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard */
+ static const PRUnichar **__asInParam_Arr(const PRUnichar **aArr) { return aArr; }
+};
+
+template<>
+struct SafeArrayTraits<nsID *>
+{
+protected:
+
+ static void Init(nsID * &aElem) { aElem = NULL; }
+
+ static void Uninit(nsID * &aElem)
+ {
+ if (aElem)
+ {
+ ::nsMemory::Free(aElem);
+ aElem = NULL;
+ }
+ }
+
+ static void Copy(const nsID * aFrom, nsID * &aTo)
+ {
+ if (aFrom)
+ {
+ aTo = (nsID *) ::nsMemory::Alloc(sizeof(nsID));
+ if (aTo)
+ *aTo = *aFrom;
+ }
+ else
+ aTo = NULL;
+ }
+
+ /* This specification is also reused for SafeConstGUIDArray, so provide a
+ * no-op Init() and Uninit() which are necessary for SafeArray<> but should
+ * be never called in context of SafeConstGUIDArray. */
+
+ static void Init(const nsID * &aElem) { NOREF(aElem); AssertFailed(); }
+ static void Uninit(const nsID * &aElem) { NOREF(aElem); AssertFailed(); }
+
+public:
+
+ /** Magic to workaround strict rules of par. 4.4.4 of the C++ standard. */
+ static const nsID **__asInParam_Arr(nsID **aArr)
+ {
+ return const_cast<const nsID **>(aArr);
+ }
+ static const nsID **__asInParam_Arr(const nsID **aArr) { return aArr; }
+};
+
+#else /* !VBOX_WITH_XPCOM */
+
+////////////////////////////////////////////////////////////////////////////////
+
+struct SafeArrayTraitsBase
+{
+protected:
+
+ static SAFEARRAY *CreateSafeArray(VARTYPE aVarType, SAFEARRAYBOUND *aBound)
+ { return SafeArrayCreate(aVarType, 1, aBound); }
+};
+
+/**
+ * Provides various helpers for SafeArray.
+ *
+ * @param T Type of array elements.
+ *
+ * Specializations of this template must provide the following methods:
+ *
+ // Returns the VARTYPE of COM SafeArray elements to be used for T
+ static VARTYPE VarType();
+
+ // Returns the number of VarType() elements necessary for aSize
+ // elements of T
+ static ULONG VarCount(size_t aSize);
+
+ // Returns the number of elements of T that fit into the given number of
+ // VarType() elements (opposite to VarCount(size_t aSize)).
+ static size_t Size(ULONG aVarCount);
+
+ // Creates a deep copy of aFrom and stores it in aTo
+ static void Copy(ULONG aFrom, ULONG &aTo);
+ */
+template<typename T>
+struct SafeArrayTraits : public SafeArrayTraitsBase
+{
+protected:
+
+ // Arbitrary types are treated as passed by value and each value is
+ // represented by a number of VT_Ix type elements where VT_Ix has the
+ // biggest possible bitness necessary to represent T w/o a gap. COM enums
+ // fall into this category.
+
+ static VARTYPE VarType()
+ {
+#ifdef VBOX_WITH_TYPE_TRAITS
+ if ( std::is_integral<T>::value
+ && !std::is_signed<T>::value)
+ {
+ if (sizeof(T) % 8 == 0) return VT_UI8;
+ if (sizeof(T) % 4 == 0) return VT_UI4;
+ if (sizeof(T) % 2 == 0) return VT_UI2;
+ return VT_UI1;
+ }
+#endif
+ if (sizeof(T) % 8 == 0) return VT_I8;
+ if (sizeof(T) % 4 == 0) return VT_I4;
+ if (sizeof(T) % 2 == 0) return VT_I2;
+ return VT_I1;
+ }
+
+ /*
+ * Fallback method in case type traits (VBOX_WITH_TYPE_TRAITS)
+ * are not available. Always returns unsigned types.
+ */
+ static VARTYPE VarTypeUnsigned()
+ {
+ if (sizeof(T) % 8 == 0) return VT_UI8;
+ if (sizeof(T) % 4 == 0) return VT_UI4;
+ if (sizeof(T) % 2 == 0) return VT_UI2;
+ return VT_UI1;
+ }
+
+ static ULONG VarCount(size_t aSize)
+ {
+ if (sizeof(T) % 8 == 0) return (ULONG)((sizeof(T) / 8) * aSize);
+ if (sizeof(T) % 4 == 0) return (ULONG)((sizeof(T) / 4) * aSize);
+ if (sizeof(T) % 2 == 0) return (ULONG)((sizeof(T) / 2) * aSize);
+ return (ULONG)(sizeof(T) * aSize);
+ }
+
+ static size_t Size(ULONG aVarCount)
+ {
+ if (sizeof(T) % 8 == 0) return (size_t)(aVarCount * 8) / sizeof(T);
+ if (sizeof(T) % 4 == 0) return (size_t)(aVarCount * 4) / sizeof(T);
+ if (sizeof(T) % 2 == 0) return (size_t)(aVarCount * 2) / sizeof(T);
+ return (size_t) aVarCount / sizeof(T);
+ }
+
+ static void Copy(T aFrom, T &aTo) { aTo = aFrom; }
+};
+
+template<typename T>
+struct SafeArrayTraits<T *>
+{
+ // Arbitrary pointer types are not supported
+};
+
+/* Although the generic SafeArrayTraits template would work for all integers,
+ * we specialize it for some of them in order to use the correct VT_ type */
+
+template<>
+struct SafeArrayTraits<LONG> : public SafeArrayTraitsBase
+{
+protected:
+
+ static VARTYPE VarType() { return VT_I4; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(LONG aFrom, LONG &aTo) { aTo = aFrom; }
+};
+
+template<>
+struct SafeArrayTraits<ULONG> : public SafeArrayTraitsBase
+{
+protected:
+
+ static VARTYPE VarType() { return VT_UI4; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(ULONG aFrom, ULONG &aTo) { aTo = aFrom; }
+};
+
+template<>
+struct SafeArrayTraits<LONG64> : public SafeArrayTraitsBase
+{
+protected:
+
+ static VARTYPE VarType() { return VT_I8; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(LONG64 aFrom, LONG64 &aTo) { aTo = aFrom; }
+};
+
+template<>
+struct SafeArrayTraits<ULONG64> : public SafeArrayTraitsBase
+{
+protected:
+
+ static VARTYPE VarType() { return VT_UI8; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(ULONG64 aFrom, ULONG64 &aTo) { aTo = aFrom; }
+};
+
+template<>
+struct SafeArrayTraits<BSTR> : public SafeArrayTraitsBase
+{
+protected:
+
+ static VARTYPE VarType() { return VT_BSTR; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(BSTR aFrom, BSTR &aTo)
+ {
+ aTo = aFrom ? ::SysAllocString((const OLECHAR *)aFrom) : NULL;
+ }
+};
+
+template<>
+struct SafeArrayTraits<GUID> : public SafeArrayTraitsBase
+{
+protected:
+
+ /* Use the 64-bit unsigned integer type for GUID */
+ static VARTYPE VarType() { return VT_UI8; }
+
+ /* GUID is 128 bit, so we need two VT_UI8 */
+ static ULONG VarCount(size_t aSize)
+ {
+ AssertCompileSize(GUID, 16);
+ return (ULONG)(aSize * 2);
+ }
+
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount / 2; }
+
+ static void Copy(GUID aFrom, GUID &aTo) { aTo = aFrom; }
+};
+
+/**
+ * Helper for SafeArray::__asOutParam() that automatically updates m.raw after a
+ * non-NULL m.arr assignment.
+ */
+class OutSafeArrayDipper
+{
+ OutSafeArrayDipper(SAFEARRAY **aArr, void **aRaw)
+ : arr(aArr), raw(aRaw) { Assert(*aArr == NULL && *aRaw == NULL); }
+
+ SAFEARRAY **arr;
+ void **raw;
+
+ template<class, class> friend class SafeArray;
+
+public:
+
+ ~OutSafeArrayDipper()
+ {
+ if (*arr != NULL)
+ {
+ HRESULT rc = SafeArrayAccessData(*arr, raw);
+ AssertComRC(rc);
+ }
+ }
+
+ operator SAFEARRAY **() { return arr; }
+};
+
+#endif /* !VBOX_WITH_XPCOM */
+
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * The SafeArray class represents the safe array type used in COM to pass arrays
+ * to/from interface methods.
+ *
+ * This helper class hides all MSCOM/XPCOM specific implementation details and,
+ * together with ComSafeArrayIn, ComSafeArrayOut and ComSafeArrayRet macros,
+ * provides a platform-neutral way to handle safe arrays in the method
+ * implementation.
+ *
+ * When an instance of this class is destroyed, it automatically frees all
+ * resources occupied by individual elements of the array as well as by the
+ * array itself. However, when the value of an element is manually changed
+ * using #operator[] or by accessing array data through the #raw() pointer, it is
+ * the caller's responsibility to free resources occupied by the previous
+ * element's value.
+ *
+ * Also, objects of this class do not support copy and assignment operations and
+ * therefore cannot be returned from functions by value. In other words, this
+ * class is just a temporary storage for handling interface method calls and not
+ * intended to be used to store arrays as data members and such -- you should
+ * use normal list/vector classes for that.
+ *
+ * @note The current implementation supports only one-dimensional arrays.
+ *
+ * @note This class is not thread-safe.
+ */
+template<typename T, class Traits = SafeArrayTraits<T> >
+class SafeArray : public Traits
+{
+public:
+
+ /**
+ * Creates a null array.
+ */
+ SafeArray() { }
+
+ /**
+ * Creates a new array of the given size. All elements of the newly created
+ * array initialized with null values.
+ *
+ * @param aSize Initial number of elements in the array.
+ *
+ * @note If this object remains null after construction it means that there
+ * was not enough memory for creating an array of the requested size.
+ * The constructor will also assert in this case.
+ */
+ SafeArray(size_t aSize) { resize(aSize); }
+
+ /**
+ * Weakly attaches this instance to the existing array passed in a method
+ * parameter declared using the ComSafeArrayIn macro. When using this call,
+ * always wrap the parameter name in the ComSafeArrayInArg macro call like
+ * this:
+ * <pre>
+ * SafeArray safeArray(ComSafeArrayInArg(aArg));
+ * </pre>
+ *
+ * Note that this constructor doesn't take the ownership of the array. In
+ * particular, it means that operations that operate on the ownership (e.g.
+ * #detachTo()) are forbidden and will assert.
+ *
+ * @param aArg Input method parameter to attach to.
+ */
+ SafeArray(ComSafeArrayIn(T, aArg))
+ {
+ if (aArg)
+ {
+#ifdef VBOX_WITH_XPCOM
+
+ m.size = aArgSize;
+ m.arr = aArg;
+ m.isWeak = true;
+
+#else /* !VBOX_WITH_XPCOM */
+
+ SAFEARRAY *arg = aArg;
+
+ AssertReturnVoid(arg->cDims == 1);
+
+ VARTYPE vt;
+ HRESULT rc = SafeArrayGetVartype(arg, &vt);
+ AssertComRCReturnVoid(rc);
+# ifndef VBOX_WITH_TYPE_TRAITS
+ AssertMsgReturnVoid(
+ vt == VarType()
+ || vt == VarTypeUnsigned(),
+ ("Expected vartype %d or %d, got %d.\n",
+ VarType(), VarTypeUnsigned(), vt));
+# else /* !VBOX_WITH_TYPE_TRAITS */
+ AssertMsgReturnVoid(
+ vt == VarType(),
+ ("Expected vartype %d, got %d.\n",
+ VarType(), vt));
+# endif
+ rc = SafeArrayAccessData(arg, (void HUGEP **)&m.raw);
+ AssertComRCReturnVoid(rc);
+
+ m.arr = arg;
+ m.isWeak = true;
+
+#endif /* !VBOX_WITH_XPCOM */
+ }
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ container that stores
+ * T objects.
+ *
+ * @param aCntr Container object to copy.
+ *
+ * @tparam C Standard C++ container template class (normally deduced from
+ * @c aCntr).
+ */
+ template<template<typename, typename> class C, class A>
+ SafeArray(const C<T, A> & aCntr)
+ {
+ resize(aCntr.size());
+ AssertReturnVoid(!isNull());
+
+ size_t i = 0;
+ for (typename C<T, A>::const_iterator it = aCntr.begin();
+ it != aCntr.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ SafeArray::Copy(*it, m.arr[i]);
+#else
+ Copy(*it, m.raw[i]);
+#endif
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ map that stores T objects
+ * as values.
+ *
+ * @param aMap Map object to copy.
+ *
+ * @tparam C Standard C++ map template class (normally deduced from
+ * @a aMap).
+ * @tparam L Standard C++ compare class (deduced from @a aMap).
+ * @tparam A Standard C++ allocator class (deduced from @a aMap).
+ * @tparam K Map key class (deduced from @a aMap).
+ */
+ template<template<typename, typename, typename, typename>
+ class C, class L, class A, class K>
+ SafeArray(const C<K, T, L, A> & aMap)
+ {
+ typedef C<K, T, L, A> Map;
+
+ resize(aMap.size());
+ AssertReturnVoid(!isNull());
+
+ size_t i = 0;
+ for (typename Map::const_iterator it = aMap.begin();
+ it != aMap.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ Copy(it->second, m.arr[i]);
+#else
+ Copy(it->second, m.raw[i]);
+#endif
+ }
+
+ /**
+ * Destroys this instance after calling #setNull() to release allocated
+ * resources. See #setNull() for more details.
+ */
+ virtual ~SafeArray() { setNull(); }
+
+ /**
+ * Returns @c true if this instance represents a null array.
+ */
+ bool isNull() const { return m.arr == NULL; }
+
+ /**
+ * Returns @c true if this instance does not represents a null array.
+ */
+ bool isNotNull() const { return m.arr != NULL; }
+
+ /**
+ * Resets this instance to null and, if this instance is not a weak one,
+ * releases any resources occupied by the array data.
+ *
+ * @note This method destroys (cleans up) all elements of the array using
+ * the corresponding cleanup routine for the element type before the
+ * array itself is destroyed.
+ */
+ virtual void setNull() { m.uninit(); }
+
+ /**
+ * Returns @c true if this instance is weak. A weak instance doesn't own the
+ * array data and therefore operations manipulating the ownership (e.g.
+ * #detachTo()) are forbidden and will assert.
+ */
+ bool isWeak() const { return m.isWeak; }
+
+ /** Number of elements in the array. */
+ size_t size() const
+ {
+#ifdef VBOX_WITH_XPCOM
+ if (m.arr)
+ return m.size;
+ return 0;
+#else
+ if (m.arr)
+ return Size(m.arr->rgsabound[0].cElements);
+ return 0;
+#endif
+ }
+
+ /**
+ * Appends a copy of the given element at the end of the array.
+ *
+ * The array size is increased by one by this method and the additional
+ * space is allocated as needed.
+ *
+ * This method is handy in cases where you want to assign a copy of the
+ * existing value to the array element, for example:
+ * <tt>Bstr string; array.push_back(string);</tt>. If you create a string
+ * just to put it in the array, you may find #appendedRaw() more useful.
+ *
+ * @param aElement Element to append.
+ *
+ * @return @c true on success and @c false if there is not enough
+ * memory for resizing.
+ */
+ bool push_back(const T &aElement)
+ {
+ if (!ensureCapacity(size() + 1))
+ return false;
+
+#ifdef VBOX_WITH_XPCOM
+ SafeArray::Copy(aElement, m.arr[m.size]);
+ ++ m.size;
+#else
+ Copy(aElement, m.raw[size() - 1]);
+#endif
+ return true;
+ }
+
+ /**
+ * Appends an empty element at the end of the array and returns a raw
+ * pointer to it suitable for assigning a raw value (w/o constructing a
+ * copy).
+ *
+ * The array size is increased by one by this method and the additional
+ * space is allocated as needed.
+ *
+ * Note that in case of raw assignment, value ownership (for types with
+ * dynamically allocated data and for interface pointers) is transferred to
+ * the safe array object.
+ *
+ * This method is handy for operations like
+ * <tt>Bstr("foo").detachTo(array.appendedRaw());</tt>. Don't use it as
+ * an l-value (<tt>array.appendedRaw() = SysAllocString(L"tralala");</tt>)
+ * since this doesn't check for a NULL condition; use #resize() instead. If
+ * you need to assign a copy of the existing value instead of transferring
+ * the ownership, look at #push_back().
+ *
+ * @return Raw pointer to the added element or NULL if no memory.
+ */
+ T *appendedRaw()
+ {
+ if (!ensureCapacity(size() + 1))
+ return NULL;
+
+#ifdef VBOX_WITH_XPCOM
+ SafeArray::Init(m.arr[m.size]);
+ ++ m.size;
+ return &m.arr[m.size - 1];
+#else
+ /* nothing to do here, SafeArrayCreate() has performed element
+ * initialization */
+ return &m.raw[size() - 1];
+#endif
+ }
+
+ /**
+ * Resizes the array preserving its contents when possible. If the new size
+ * is larger than the old size, new elements are initialized with null
+ * values. If the new size is less than the old size, the contents of the
+ * array beyond the new size is lost.
+ *
+ * @param aNewSize New number of elements in the array.
+ * @return @c true on success and @c false if there is not enough
+ * memory for resizing.
+ */
+ bool resize(size_t aNewSize)
+ {
+ if (!ensureCapacity(aNewSize))
+ return false;
+
+#ifdef VBOX_WITH_XPCOM
+
+ if (m.size < aNewSize)
+ {
+ /* initialize the new elements */
+ for (size_t i = m.size; i < aNewSize; ++ i)
+ SafeArray::Init(m.arr[i]);
+ }
+
+ /** @todo Fix this! */
+ m.size = (PRUint32)aNewSize;
+#else
+ /* nothing to do here, SafeArrayCreate() has performed element
+ * initialization */
+#endif
+ return true;
+ }
+
+ /**
+ * Reinitializes this instance by preallocating space for the given number
+ * of elements. The previous array contents is lost.
+ *
+ * @param aNewSize New number of elements in the array.
+ * @return @c true on success and @c false if there is not enough
+ * memory for resizing.
+ */
+ bool reset(size_t aNewSize)
+ {
+ m.uninit();
+ return resize(aNewSize);
+ }
+
+ /**
+ * Returns a pointer to the raw array data. Use this raw pointer with care
+ * as no type or bound checking is done for you in this case.
+ *
+ * @note This method returns @c NULL when this instance is null.
+ * @see #operator[]
+ */
+ T *raw()
+ {
+#ifdef VBOX_WITH_XPCOM
+ return m.arr;
+#else
+ return m.raw;
+#endif
+ }
+
+ /**
+ * Const version of #raw().
+ */
+ const T *raw() const
+ {
+#ifdef VBOX_WITH_XPCOM
+ return m.arr;
+#else
+ return m.raw;
+#endif
+ }
+
+ /**
+ * Array access operator that returns an array element by reference. A bit
+ * safer than #raw(): asserts and returns a reference to a static zero
+ * element (const, i.e. writes will fail) if this instance is null or
+ * if the index is out of bounds.
+ *
+ * @note For weak instances, this call will succeed but the behavior of
+ * changing the contents of an element of the weak array instance is
+ * undefined and may lead to a program crash on some platforms.
+ */
+ T &operator[] (size_t aIdx)
+ {
+ /** @todo r=klaus should do this as a AssertCompile, but cannot find a way which works. */
+ Assert(sizeof(T) <= sizeof(Zeroes));
+ AssertReturn(m.arr != NULL, *(T *)&Zeroes[0]);
+ AssertReturn(aIdx < size(), *(T *)&Zeroes[0]);
+#ifdef VBOX_WITH_XPCOM
+ return m.arr[aIdx];
+#else
+ AssertReturn(m.raw != NULL, *(T *)&Zeroes[0]);
+ return m.raw[aIdx];
+#endif
+ }
+
+ /**
+ * Const version of #operator[] that returns an array element by value.
+ */
+ const T operator[] (size_t aIdx) const
+ {
+ AssertReturn(m.arr != NULL, *(const T *)&Zeroes[0]);
+ AssertReturn(aIdx < size(), *(const T *)&Zeroes[0]);
+#ifdef VBOX_WITH_XPCOM
+ return m.arr[aIdx];
+#else
+ AssertReturn(m.raw != NULL, *(const T *)&Zeroes[0]);
+ return m.raw[aIdx];
+#endif
+ }
+
+ /**
+ * Creates a copy of this array and stores it in a method parameter declared
+ * using the ComSafeArrayOut macro. When using this call, always wrap the
+ * parameter name in the ComSafeArrayOutArg macro call like this:
+ * <pre>
+ * safeArray.cloneTo(ComSafeArrayOutArg(aArg));
+ * </pre>
+ *
+ * @note It is assumed that the ownership of the returned copy is
+ * transferred to the caller of the method and he is responsible to free the
+ * array data when it is no longer needed.
+ *
+ * @param aArg Output method parameter to clone to.
+ */
+ virtual const SafeArray &cloneTo(ComSafeArrayOut(T, aArg)) const
+ {
+ /// @todo Implement me!
+#ifdef VBOX_WITH_XPCOM
+ NOREF(aArgSize);
+ NOREF(aArg);
+#else
+ NOREF(aArg);
+#endif
+ AssertFailedReturn(*this);
+ }
+
+ HRESULT cloneTo(SafeArray<T>& aOther) const
+ {
+ aOther.reset(size());
+ return aOther.initFrom(*this);
+ }
+
+
+ /**
+ * Transfers the ownership of this array's data to the specified location
+ * declared using the ComSafeArrayOut macro and makes this array a null
+ * array. When using this call, always wrap the parameter name in the
+ * ComSafeArrayOutArg macro call like this:
+ * <pre>
+ * safeArray.detachTo(ComSafeArrayOutArg(aArg));
+ * </pre>
+ *
+ * Detaching the null array is also possible in which case the location will
+ * receive NULL.
+ *
+ * @note Since the ownership of the array data is transferred to the
+ * caller of the method, he is responsible to free the array data when it is
+ * no longer needed.
+ *
+ * @param aArg Location to detach to.
+ */
+ virtual SafeArray &detachTo(ComSafeArrayOut(T, aArg))
+ {
+ AssertReturn(!m.isWeak, *this);
+
+#ifdef VBOX_WITH_XPCOM
+
+ AssertReturn(aArgSize != NULL, *this);
+ AssertReturn(aArg != NULL, *this);
+
+ *aArgSize = m.size;
+ *aArg = m.arr;
+
+ m.isWeak = false;
+ m.size = 0;
+ m.arr = NULL;
+
+#else /* !VBOX_WITH_XPCOM */
+
+ AssertReturn(aArg != NULL, *this);
+ *aArg = m.arr;
+
+ if (m.raw)
+ {
+ HRESULT rc = SafeArrayUnaccessData(m.arr);
+ AssertComRCReturn(rc, *this);
+ m.raw = NULL;
+ }
+
+ m.isWeak = false;
+ m.arr = NULL;
+
+#endif /* !VBOX_WITH_XPCOM */
+
+ return *this;
+ }
+
+ /**
+ * Returns a copy of this SafeArray as RTCList<T>.
+ */
+ RTCList<T> toList()
+ {
+ RTCList<T> list(size());
+ for (size_t i = 0; i < size(); ++i)
+#ifdef VBOX_WITH_XPCOM
+ list.append(m.arr[i]);
+#else
+ list.append(m.raw[i]);
+#endif
+ return list;
+ }
+
+ inline HRESULT initFrom(const com::SafeArray<T> & aRef);
+ inline HRESULT initFrom(const T* aPtr, size_t aSize);
+
+ // Public methods for internal purposes only.
+
+#ifdef VBOX_WITH_XPCOM
+
+ /** Internal function. Never call it directly. */
+ PRUint32 *__asOutParam_Size() { setNull(); return &m.size; }
+
+ /** Internal function Never call it directly. */
+ T **__asOutParam_Arr() { Assert(isNull()); return &m.arr; }
+
+#else /* !VBOX_WITH_XPCOM */
+
+ /** Internal function Never call it directly. */
+ SAFEARRAY * __asInParam() { return m.arr; }
+
+ /** Internal function Never call it directly. */
+ OutSafeArrayDipper __asOutParam()
+ { setNull(); return OutSafeArrayDipper(&m.arr, (void **)&m.raw); }
+
+#endif /* !VBOX_WITH_XPCOM */
+
+ static const SafeArray Null;
+
+protected:
+
+ DECLARE_CLS_COPY_CTOR_ASSIGN_NOOP(SafeArray);
+
+ /**
+ * Ensures that the array is big enough to contain aNewSize elements.
+ *
+ * If the new size is greater than the current capacity, a new array is
+ * allocated and elements from the old array are copied over. The size of
+ * the array doesn't change, only the capacity increases (which is always
+ * greater than the size). Note that the additionally allocated elements are
+ * left uninitialized by this method.
+ *
+ * If the new size is less than the current size, the existing array is
+ * truncated to the specified size and the elements outside the new array
+ * boundary are freed.
+ *
+ * If the new size is the same as the current size, nothing happens.
+ *
+ * @param aNewSize New size of the array.
+ *
+ * @return @c true on success and @c false if not enough memory.
+ */
+ bool ensureCapacity(size_t aNewSize)
+ {
+ AssertReturn(!m.isWeak, false);
+
+#ifdef VBOX_WITH_XPCOM
+
+ /* Note: we distinguish between a null array and an empty (zero
+ * elements) array. Therefore we never use zero in malloc (even if
+ * aNewSize is zero) to make sure we get a non-null pointer. */
+
+ if (m.size == aNewSize && m.arr != NULL)
+ return true;
+
+ /* Allocate in 16-byte pieces. */
+ size_t newCapacity = RT_MAX((aNewSize + 15) / 16 * 16, 16);
+
+ if (m.capacity != newCapacity)
+ {
+ T *newArr = (T *)nsMemory::Alloc(RT_MAX(newCapacity, 1) * sizeof(T));
+ AssertReturn(newArr != NULL, false);
+
+ if (m.arr != NULL)
+ {
+ if (m.size > aNewSize)
+ {
+ /* Truncation takes place, uninit exceeding elements and
+ * shrink the size. */
+ for (size_t i = aNewSize; i < m.size; ++ i)
+ SafeArray::Uninit(m.arr[i]);
+
+ /** @todo Fix this! */
+ m.size = (PRUint32)aNewSize;
+ }
+
+ /* Copy the old contents. */
+ memcpy(newArr, m.arr, m.size * sizeof(T));
+ nsMemory::Free((void *)m.arr);
+ }
+
+ m.arr = newArr;
+ }
+ else
+ {
+ if (m.size > aNewSize)
+ {
+ /* Truncation takes place, uninit exceeding elements and
+ * shrink the size. */
+ for (size_t i = aNewSize; i < m.size; ++ i)
+ SafeArray::Uninit(m.arr[i]);
+
+ /** @todo Fix this! */
+ m.size = (PRUint32)aNewSize;
+ }
+ }
+
+ /** @todo Fix this! */
+ m.capacity = (PRUint32)newCapacity;
+
+#else
+
+ SAFEARRAYBOUND bound = { VarCount(aNewSize), 0 };
+ HRESULT rc;
+
+ if (m.arr == NULL)
+ {
+ m.arr = CreateSafeArray(VarType(), &bound);
+ AssertReturn(m.arr != NULL, false);
+ }
+ else
+ {
+ SafeArrayUnaccessData(m.arr);
+
+ rc = SafeArrayRedim(m.arr, &bound);
+ AssertComRCReturn(rc == S_OK, false);
+ }
+
+ rc = SafeArrayAccessData(m.arr, (void HUGEP **)&m.raw);
+ AssertComRCReturn(rc, false);
+
+#endif
+ return true;
+ }
+
+ struct Data
+ {
+ Data()
+ : isWeak(false)
+#ifdef VBOX_WITH_XPCOM
+ , capacity(0), size(0), arr(NULL)
+#else
+ , arr(NULL), raw(NULL)
+#endif
+ {}
+
+ ~Data() { uninit(); }
+
+ void uninit()
+ {
+#ifdef VBOX_WITH_XPCOM
+
+ if (arr)
+ {
+ if (!isWeak)
+ {
+ for (size_t i = 0; i < size; ++ i)
+ SafeArray::Uninit(arr[i]);
+
+ nsMemory::Free((void *)arr);
+ }
+ else
+ isWeak = false;
+
+ arr = NULL;
+ }
+
+ size = capacity = 0;
+
+#else /* !VBOX_WITH_XPCOM */
+
+ if (arr)
+ {
+ if (raw)
+ {
+ SafeArrayUnaccessData(arr);
+ raw = NULL;
+ }
+
+ if (!isWeak)
+ {
+ HRESULT rc = SafeArrayDestroy(arr);
+ AssertComRCReturnVoid(rc);
+ }
+ else
+ isWeak = false;
+
+ arr = NULL;
+ }
+
+#endif /* !VBOX_WITH_XPCOM */
+ }
+
+ bool isWeak : 1;
+
+#ifdef VBOX_WITH_XPCOM
+ PRUint32 capacity;
+ PRUint32 size;
+ T *arr;
+#else
+ SAFEARRAY *arr;
+ T *raw;
+#endif
+ };
+
+ Data m;
+};
+
+/* Few fast specializations for primitive array types */
+template<>
+inline HRESULT com::SafeArray<BYTE>::initFrom(const com::SafeArray<BYTE> & aRef)
+{
+ size_t sSize = aRef.size();
+ if (resize(sSize))
+ {
+ ::memcpy(raw(), aRef.raw(), sSize);
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+template<>
+inline HRESULT com::SafeArray<BYTE>::initFrom(const BYTE *aPtr, size_t aSize)
+{
+ if (resize(aSize))
+ {
+ ::memcpy(raw(), aPtr, aSize);
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+
+
+template<>
+inline HRESULT com::SafeArray<SHORT>::initFrom(const com::SafeArray<SHORT> & aRef)
+{
+ size_t sSize = aRef.size();
+ if (resize(sSize))
+ {
+ ::memcpy(raw(), aRef.raw(), sSize * sizeof(SHORT));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+template<>
+inline HRESULT com::SafeArray<SHORT>::initFrom(const SHORT *aPtr, size_t aSize)
+{
+ if (resize(aSize))
+ {
+ ::memcpy(raw(), aPtr, aSize * sizeof(SHORT));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+
+template<>
+inline HRESULT com::SafeArray<USHORT>::initFrom(const com::SafeArray<USHORT> & aRef)
+{
+ size_t sSize = aRef.size();
+ if (resize(sSize))
+ {
+ ::memcpy(raw(), aRef.raw(), sSize * sizeof(USHORT));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+template<>
+inline HRESULT com::SafeArray<USHORT>::initFrom(const USHORT *aPtr, size_t aSize)
+{
+ if (resize(aSize))
+ {
+ ::memcpy(raw(), aPtr, aSize * sizeof(USHORT));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+
+template<>
+inline HRESULT com::SafeArray<LONG>::initFrom(const com::SafeArray<LONG> & aRef)
+{
+ size_t sSize = aRef.size();
+ if (resize(sSize))
+ {
+ ::memcpy(raw(), aRef.raw(), sSize * sizeof(LONG));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+template<>
+inline HRESULT com::SafeArray<LONG>::initFrom(const LONG *aPtr, size_t aSize)
+{
+ if (resize(aSize))
+ {
+ ::memcpy(raw(), aPtr, aSize * sizeof(LONG));
+ return S_OK;
+ }
+ return E_OUTOFMEMORY;
+}
+
+
+////////////////////////////////////////////////////////////////////////////////
+
+#ifdef VBOX_WITH_XPCOM
+
+/**
+ * Version of com::SafeArray for arrays of GUID.
+ *
+ * In MS COM, GUID arrays store GUIDs by value and therefore input arrays are
+ * represented using |GUID *| and out arrays -- using |GUID **|. In XPCOM,
+ * GUID arrays store pointers to nsID so that input arrays are |const nsID **|
+ * and out arrays are |nsID ***|. Due to this difference, it is impossible to
+ * work with arrays of GUID on both platforms by simply using com::SafeArray
+ * <GUID>. This class is intended to provide some level of cross-platform
+ * behavior.
+ *
+ * The basic usage pattern is basically similar to com::SafeArray<> except that
+ * you use ComSafeGUIDArrayIn* and ComSafeGUIDArrayOut* macros instead of
+ * ComSafeArrayIn* and ComSafeArrayOut*. Another important nuance is that the
+ * raw() array type is different (nsID **, or GUID ** on XPCOM and GUID * on MS
+ * COM) so it is recommended to use operator[] instead which always returns a
+ * GUID by value.
+ *
+ * Note that due to const modifiers, you cannot use SafeGUIDArray for input GUID
+ * arrays. Please use SafeConstGUIDArray for this instead.
+ *
+ * Other than mentioned above, the functionality of this class is equivalent to
+ * com::SafeArray<>. See the description of that template and its methods for
+ * more information.
+ *
+ * Output GUID arrays are handled by a separate class, SafeGUIDArrayOut, since
+ * this class cannot handle them because of const modifiers.
+ */
+class SafeGUIDArray : public SafeArray<nsID *>
+{
+public:
+
+ typedef SafeArray<nsID *> Base;
+
+ class nsIDRef
+ {
+ public:
+
+ nsIDRef(nsID * &aVal) : mVal(aVal) { AssertCompile(sizeof(nsID) <= sizeof(Zeroes)); }
+
+ operator const nsID &() const { return mVal ? *mVal : *(const nsID *)&Zeroes[0]; }
+ operator nsID() const { return mVal ? *mVal : *(nsID *)&Zeroes[0]; }
+
+ const nsID *operator&() const { return mVal ? mVal : (const nsID *)&Zeroes[0]; }
+
+ nsIDRef &operator= (const nsID &aThat)
+ {
+ if (mVal == NULL)
+ Copy(&aThat, mVal);
+ else
+ *mVal = aThat;
+ return *this;
+ }
+
+ private:
+
+ nsID * &mVal;
+
+ friend class SafeGUIDArray;
+ };
+
+ /** See SafeArray<>::SafeArray(). */
+ SafeGUIDArray() {}
+
+ /** See SafeArray<>::SafeArray(size_t). */
+ SafeGUIDArray(size_t aSize) : Base(aSize) {}
+
+ /**
+ * Array access operator that returns an array element by reference. As a
+ * special case, the return value of this operator on XPCOM is an nsID (GUID)
+ * reference, instead of an nsID pointer (the actual SafeArray template
+ * argument), for compatibility with the MS COM version.
+ *
+ * The rest is equivalent to SafeArray<>::operator[].
+ */
+ nsIDRef operator[] (size_t aIdx)
+ {
+ Assert(m.arr != NULL);
+ Assert(aIdx < size());
+ return nsIDRef(m.arr[aIdx]);
+ }
+
+ /**
+ * Const version of #operator[] that returns an array element by value.
+ */
+ const nsID &operator[] (size_t aIdx) const
+ {
+ Assert(m.arr != NULL);
+ Assert(aIdx < size());
+ return m.arr[aIdx] ? *m.arr[aIdx] : *(const nsID *)&Zeroes[0];
+ }
+};
+
+/**
+ * Version of com::SafeArray for const arrays of GUID.
+ *
+ * This class is used to work with input GUID array parameters in method
+ * implementations. See SafeGUIDArray for more details.
+ */
+class SafeConstGUIDArray : public SafeArray<const nsID *,
+ SafeArrayTraits<nsID *> >
+{
+public:
+
+ typedef SafeArray<const nsID *, SafeArrayTraits<nsID *> > Base;
+
+ /** See SafeArray<>::SafeArray(). */
+ SafeConstGUIDArray() { AssertCompile(sizeof(nsID) <= sizeof(Zeroes)); }
+
+ /* See SafeArray<>::SafeArray(ComSafeArrayIn(T, aArg)). */
+ SafeConstGUIDArray(ComSafeGUIDArrayIn(aArg))
+ : Base(ComSafeGUIDArrayInArg(aArg)) {}
+
+ /**
+ * Array access operator that returns an array element by reference. As a
+ * special case, the return value of this operator on XPCOM is nsID (GUID)
+ * instead of nsID *, for compatibility with the MS COM version.
+ *
+ * The rest is equivalent to SafeArray<>::operator[].
+ */
+ const nsID &operator[] (size_t aIdx) const
+ {
+ AssertReturn(m.arr != NULL, *(const nsID *)&Zeroes[0]);
+ AssertReturn(aIdx < size(), *(const nsID *)&Zeroes[0]);
+ return *m.arr[aIdx];
+ }
+
+private:
+
+ /* These are disabled because of const. */
+ bool reset(size_t aNewSize) { NOREF(aNewSize); return false; }
+};
+
+#else /* !VBOX_WITH_XPCOM */
+
+typedef SafeArray<GUID> SafeGUIDArray;
+typedef SafeArray<const GUID, SafeArrayTraits<GUID> > SafeConstGUIDArray;
+
+#endif /* !VBOX_WITH_XPCOM */
+
+////////////////////////////////////////////////////////////////////////////////
+
+#ifdef VBOX_WITH_XPCOM
+
+template<class I>
+struct SafeIfaceArrayTraits
+{
+protected:
+
+ static void Init(I * &aElem) { aElem = NULL; }
+ static void Uninit(I * &aElem)
+ {
+ if (aElem)
+ {
+ aElem->Release();
+ aElem = NULL;
+ }
+ }
+
+ static void Copy(I * aFrom, I * &aTo)
+ {
+ if (aFrom != NULL)
+ {
+ aTo = aFrom;
+ aTo->AddRef();
+ }
+ else
+ aTo = NULL;
+ }
+
+public:
+
+ /* Magic to workaround strict rules of par. 4.4.4 of the C++ standard. */
+ static I **__asInParam_Arr(I **aArr) { return aArr; }
+ static I **__asInParam_Arr(const I **aArr) { return const_cast<I **>(aArr); }
+};
+
+#else /* !VBOX_WITH_XPCOM */
+
+template<class I>
+struct SafeIfaceArrayTraits
+{
+protected:
+
+ static VARTYPE VarType() { return VT_DISPATCH; }
+ static ULONG VarCount(size_t aSize) { return (ULONG)aSize; }
+ static size_t Size(ULONG aVarCount) { return (size_t)aVarCount; }
+
+ static void Copy(I * aFrom, I * &aTo)
+ {
+ if (aFrom != NULL)
+ {
+ aTo = aFrom;
+ aTo->AddRef();
+ }
+ else
+ aTo = NULL;
+ }
+
+ static SAFEARRAY *CreateSafeArray(VARTYPE aVarType, SAFEARRAYBOUND *aBound)
+ {
+ NOREF(aVarType);
+ return SafeArrayCreateEx(VT_DISPATCH, 1, aBound, (PVOID)&COM_IIDOF(I));
+ }
+};
+
+#endif /* !VBOX_WITH_XPCOM */
+
+////////////////////////////////////////////////////////////////////////////////
+
+/**
+ * Version of com::SafeArray for arrays of interface pointers.
+ *
+ * Except that it manages arrays of interface pointers, the usage of this class
+ * is identical to com::SafeArray.
+ *
+ * @param I Interface class (no asterisk).
+ */
+template<class I>
+class SafeIfaceArray : public SafeArray<I *, SafeIfaceArrayTraits<I> >
+{
+public:
+
+ typedef SafeArray<I *, SafeIfaceArrayTraits<I> > Base;
+
+ /**
+ * Creates a null array.
+ */
+ SafeIfaceArray() {}
+
+ /**
+ * Creates a new array of the given size. All elements of the newly created
+ * array initialized with null values.
+ *
+ * @param aSize Initial number of elements in the array. Must be greater
+ * than 0.
+ *
+ * @note If this object remains null after construction it means that there
+ * was not enough memory for creating an array of the requested size.
+ * The constructor will also assert in this case.
+ */
+ SafeIfaceArray(size_t aSize) { Base::resize(aSize); }
+
+ /**
+ * Weakly attaches this instance to the existing array passed in a method
+ * parameter declared using the ComSafeArrayIn macro. When using this call,
+ * always wrap the parameter name in the ComSafeArrayOutArg macro call like
+ * this:
+ * <pre>
+ * SafeArray safeArray(ComSafeArrayInArg(aArg));
+ * </pre>
+ *
+ * Note that this constructor doesn't take the ownership of the array. In
+ * particular, this means that operations that operate on the ownership
+ * (e.g. #detachTo()) are forbidden and will assert.
+ *
+ * @param aArg Input method parameter to attach to.
+ */
+ SafeIfaceArray(ComSafeArrayIn(I *, aArg))
+ {
+ if (aArg)
+ {
+#ifdef VBOX_WITH_XPCOM
+
+ Base::m.size = aArgSize;
+ Base::m.arr = aArg;
+ Base::m.isWeak = true;
+
+#else /* !VBOX_WITH_XPCOM */
+
+ SAFEARRAY *arg = aArg;
+
+ AssertReturnVoid(arg->cDims == 1);
+
+ VARTYPE vt;
+ HRESULT rc = SafeArrayGetVartype(arg, &vt);
+ AssertComRCReturnVoid(rc);
+ AssertMsgReturnVoid(vt == VT_UNKNOWN || vt == VT_DISPATCH,
+ ("Expected vartype VT_UNKNOWN or VT_DISPATCH, got %d.\n",
+ vt));
+ GUID guid;
+ rc = SafeArrayGetIID(arg, &guid);
+ AssertComRCReturnVoid(rc);
+ AssertMsgReturnVoid(InlineIsEqualGUID(COM_IIDOF(I), guid) || arg->rgsabound[0].cElements == 0 /* IDispatch if empty */,
+ ("Expected IID {%RTuuid}, got {%RTuuid}.\n", &COM_IIDOF(I), &guid));
+
+ rc = SafeArrayAccessData(arg, (void HUGEP **)&m.raw);
+ AssertComRCReturnVoid(rc);
+
+ m.arr = arg;
+ m.isWeak = true;
+
+#endif /* !VBOX_WITH_XPCOM */
+ }
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ container that stores
+ * interface pointers as objects of the ComPtr\<I\> class.
+ *
+ * @param aCntr Container object to copy.
+ *
+ * @tparam C Standard C++ container template class (normally deduced from
+ * @c aCntr).
+ * @tparam A Standard C++ allocator class (deduced from @c aCntr).
+ * @tparam OI Argument to the ComPtr template (deduced from @c aCntr).
+ */
+ template<template<typename, typename> class C, class A, class OI>
+ SafeIfaceArray(const C<ComPtr<OI>, A> & aCntr)
+ {
+ typedef C<ComPtr<OI>, A> List;
+
+ Base::resize(aCntr.size());
+ AssertReturnVoid(!Base::isNull());
+
+ size_t i = 0;
+ for (typename List::const_iterator it = aCntr.begin();
+ it != aCntr.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ this->Copy(*it, Base::m.arr[i]);
+#else
+ Copy(*it, Base::m.raw[i]);
+#endif
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ container that stores
+ * interface pointers as objects of the ComObjPtr\<I\> class.
+ *
+ * @param aCntr Container object to copy.
+ *
+ * @tparam C Standard C++ container template class (normally deduced from
+ * @c aCntr).
+ * @tparam A Standard C++ allocator class (deduced from @c aCntr).
+ * @tparam OI Argument to the ComObjPtr template (deduced from @c aCntr).
+ */
+ template<template<typename, typename> class C, class A, class OI>
+ SafeIfaceArray(const C<ComObjPtr<OI>, A> & aCntr)
+ {
+ typedef C<ComObjPtr<OI>, A> List;
+
+ Base::resize(aCntr.size());
+ AssertReturnVoid(!Base::isNull());
+
+ size_t i = 0;
+ for (typename List::const_iterator it = aCntr.begin();
+ it != aCntr.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ SafeIfaceArray::Copy(*it, Base::m.arr[i]);
+#else
+ Copy(*it, Base::m.raw[i]);
+#endif
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ map whose values are
+ * interface pointers stored as objects of the ComPtr\<I\> class.
+ *
+ * @param aMap Map object to copy.
+ *
+ * @tparam C Standard C++ map template class (normally deduced from
+ * @c aCntr).
+ * @tparam L Standard C++ compare class (deduced from @c aCntr).
+ * @tparam A Standard C++ allocator class (deduced from @c aCntr).
+ * @tparam K Map key class (deduced from @c aCntr).
+ * @tparam OI Argument to the ComPtr template (deduced from @c aCntr).
+ */
+ template<template<typename, typename, typename, typename>
+ class C, class L, class A, class K, class OI>
+ SafeIfaceArray(const C<K, ComPtr<OI>, L, A> & aMap)
+ {
+ typedef C<K, ComPtr<OI>, L, A> Map;
+
+ Base::resize(aMap.size());
+ AssertReturnVoid(!Base::isNull());
+
+ size_t i = 0;
+ for (typename Map::const_iterator it = aMap.begin();
+ it != aMap.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ SafeIfaceArray::Copy(it->second, Base::m.arr[i]);
+#else
+ Copy(it->second, Base::m.raw[i]);
+#endif
+ }
+
+ /**
+ * Creates a deep copy of the given standard C++ map whose values are
+ * interface pointers stored as objects of the ComObjPtr\<I\> class.
+ *
+ * @param aMap Map object to copy.
+ *
+ * @tparam C Standard C++ map template class (normally deduced from
+ * @c aCntr).
+ * @tparam L Standard C++ compare class (deduced from @c aCntr).
+ * @tparam A Standard C++ allocator class (deduced from @c aCntr).
+ * @tparam K Map key class (deduced from @c aCntr).
+ * @tparam OI Argument to the ComObjPtr template (deduced from @c aCntr).
+ */
+ template<template<typename, typename, typename, typename>
+ class C, class L, class A, class K, class OI>
+ SafeIfaceArray(const C<K, ComObjPtr<OI>, L, A> & aMap)
+ {
+ typedef C<K, ComObjPtr<OI>, L, A> Map;
+
+ Base::resize(aMap.size());
+ AssertReturnVoid(!Base::isNull());
+
+ size_t i = 0;
+ for (typename Map::const_iterator it = aMap.begin();
+ it != aMap.end(); ++ it, ++ i)
+#ifdef VBOX_WITH_XPCOM
+ SafeIfaceArray::Copy(it->second, Base::m.arr[i]);
+#else
+ Copy(it->second, Base::m.raw[i]);
+#endif
+ }
+
+ void setElement(size_t iIdx, I* obj)
+ {
+#ifdef VBOX_WITH_XPCOM
+ SafeIfaceArray::Copy(obj, Base::m.arr[iIdx]);
+#else
+ Copy(obj, Base::m.raw[iIdx]);
+#endif
+ }
+};
+
+} /* namespace com */
+
+/** @} */
+
+#endif /* !VBOX_INCLUDED_com_array_h */
+