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diff --git a/include/VBox/com/array.h b/include/VBox/com/array.h new file mode 100644 index 00000000..7f1796d9 --- /dev/null +++ b/include/VBox/com/array.h @@ -0,0 +1,1702 @@ +/** @file + * MS COM / XPCOM Abstraction Layer: + * Safe array helper class declaration + */ + +/* + * Copyright (C) 2006-2011 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * General Public License (GPL) as published by the Free Software + * Foundation, in version 2 as it comes in the "COPYING" file of the + * VirtualBox OSE distribution. VirtualBox OSE is distributed in the + * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL) only, as it comes in the "COPYING.CDDL" file of the + * VirtualBox OSE 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. + */ + +#ifndef ___VBox_com_array_h +#define ___VBox_com_array_h + +/** @defgroup grp_COM_arrays COM/XPCOM Arrays + * @{ + * + * 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" +#include "VBox/com/ptr.h" +#include "VBox/com/assert.h" +#include "iprt/cpp/list.h" + +#ifdef VBOX_WITH_XPCOM + +/** + * 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. + */ +#define ComSafeArrayAsInParam(aArray) \ + (aArray).size(), (aArray).__asInParam_Arr((aArray).raw()) + +/** + * 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. + */ +#define ComSafeArrayAsOutParam(aArray) \ + (aArray).__asOutParam_Size(), (aArray).__asOutParam_Arr() + +#else /* !VBOX_WITH_XPCOM */ + +#define ComSafeArrayAsInParam(aArray) (aArray).__asInParam() + +#define ComSafeArrayAsOutParam(aArray) (aArray).__asOutParam() + +#endif /* !VBOX_WITH_XPCOM */ + +/** + * + */ +namespace com +{ + +#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 = 0; } + + /** Initializes memory occupied by aElem. */ + static void Uninit(T &aElem) { aElem = 0; } + + /** 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() + { + 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; + } + + 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)) + { +#ifdef VBOX_WITH_XPCOM + + AssertReturnVoid(aArg != NULL); + + m.size = aArgSize; + m.arr = aArg; + m.isWeak = true; + +#else /* !VBOX_WITH_XPCOM */ + + AssertReturnVoid(aArg != NULL); + SAFEARRAY *arg = aArg; + + if (arg) + { + AssertReturnVoid(arg->cDims == 1); + + VARTYPE vt; + HRESULT rc = SafeArrayGetVartype(arg, &vt); + AssertComRCReturnVoid(rc); + AssertMsgReturnVoid(vt == VarType(), + ("Expected vartype %d, got %d.\n", + VarType(), vt)); + + 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. + * + * @param 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. + * + * @param C Standard C++ map template class (normally deduced from + * @c aCntr). + * @param L Standard C++ compare class (deduced from @c aCntr). + * @param A Standard C++ allocator class (deduced from @c aCntr). + * @param K Map key class (deduced from @c aCntr). + */ + 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()); + + int 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() and + * #setRawAt() 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]); + } + + m.size = 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 an invalid reference 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) + { + AssertReturn(m.arr != NULL, *((T *)NULL)); + AssertReturn(aIdx < size(), *((T *)NULL)); +#ifdef VBOX_WITH_XPCOM + return m.arr[aIdx]; +#else + AssertReturn(m.raw != NULL, *((T *)NULL)); + 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, *((T *)NULL)); + AssertReturn(aIdx < size(), *((T *)NULL)); +#ifdef VBOX_WITH_XPCOM + return m.arr[aIdx]; +#else + AssertReturn(m.raw != NULL, *((T *)NULL)); + 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); + } + + void cloneTo(SafeArray<T>& aOther) const + { + aOther.reset(size()); + 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 == false, *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 void initFrom(const com::SafeArray<T> & aRef); + inline void 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]); + + m.size = 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]); + + m.size = aNewSize; + } + } + + m.capacity = 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 void com::SafeArray<BYTE>::initFrom(const com::SafeArray<BYTE> & aRef) +{ + size_t sSize = aRef.size(); + resize(sSize); + ::memcpy(raw(), aRef.raw(), sSize); +} +template<> +inline void com::SafeArray<BYTE>::initFrom(const BYTE* aPtr, size_t aSize) +{ + resize(aSize); + ::memcpy(raw(), aPtr, aSize); +} + + +template<> +inline void com::SafeArray<LONG>::initFrom(const com::SafeArray<LONG> & aRef) +{ + size_t sSize = aRef.size(); + resize(sSize); + ::memcpy(raw(), aRef.raw(), sSize * sizeof(LONG)); +} +template<> +inline void com::SafeArray<LONG>::initFrom(const LONG* aPtr, size_t aSize) +{ + resize(aSize); + ::memcpy(raw(), aPtr, aSize * sizeof(LONG)); +} + + +//////////////////////////////////////////////////////////////////////////////// + +#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) {} + + operator const nsID &() const { return mVal ? *mVal : *Empty; } + operator nsID() const { return mVal ? *mVal : *Empty; } + + const nsID *operator&() const { return mVal ? mVal : Empty; } + + nsIDRef &operator= (const nsID &aThat) + { + if (mVal == NULL) + Copy(&aThat, mVal); + else + *mVal = aThat; + return *this; + } + + private: + + nsID * &mVal; + + static const nsID *Empty; + + 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] : *nsIDRef::Empty; + } +}; + +/** + * 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() {} + + /* 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 * *)NULL)); + AssertReturn(aIdx < size(), **((const nsID * *)NULL)); + 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)&_ATL_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)) + { +#ifdef VBOX_WITH_XPCOM + + AssertReturnVoid(aArg != NULL); + + Base::m.size = aArgSize; + Base::m.arr = aArg; + Base::m.isWeak = true; + +#else /* !VBOX_WITH_XPCOM */ + + AssertReturnVoid(aArg != NULL); + SAFEARRAY *arg = aArg; + + if (arg) + { + AssertReturnVoid(arg->cDims == 1); + + VARTYPE vt; + HRESULT rc = SafeArrayGetVartype(arg, &vt); + AssertComRCReturnVoid(rc); + AssertMsgReturnVoid(vt == VT_UNKNOWN || vt == VT_DISPATCH, + ("Expected vartype VT_UNKNOWN, got %d.\n", + VarType(), vt)); + GUID guid; + rc = SafeArrayGetIID(arg, &guid); + AssertComRCReturnVoid(rc); + AssertMsgReturnVoid(InlineIsEqualGUID(_ATL_IIDOF(I), guid), + ("Expected IID {%RTuuid}, got {%RTuuid}.\n", + &_ATL_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. + * + * @param C Standard C++ container template class (normally deduced from + * @c aCntr). + * @param A Standard C++ allocator class (deduced from @c aCntr). + * @param 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()); + + int i = 0; + for (typename List::const_iterator it = aCntr.begin(); + it != aCntr.end(); ++ it, ++ i) +#ifdef VBOX_WITH_XPCOM + 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. + * + * @param C Standard C++ container template class (normally deduced from + * @c aCntr). + * @param A Standard C++ allocator class (deduced from @c aCntr). + * @param 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()); + + int 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. + * + * @param C Standard C++ map template class (normally deduced from + * @c aCntr). + * @param L Standard C++ compare class (deduced from @c aCntr). + * @param A Standard C++ allocator class (deduced from @c aCntr). + * @param K Map key class (deduced from @c aCntr). + * @param 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()); + + int 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. + * + * @param C Standard C++ map template class (normally deduced from + * @c aCntr). + * @param L Standard C++ compare class (deduced from @c aCntr). + * @param A Standard C++ allocator class (deduced from @c aCntr). + * @param K Map key class (deduced from @c aCntr). + * @param 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()); + + int 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_com_array_h */ |