qga/vss-win32/vss-common.h

   1 /*
   2  * QEMU Guest Agent win32 VSS common declarations
   3  *
   4  * Copyright Hitachi Data Systems Corp. 2013
   5  *
   6  * Authors:
   7  *  Tomoki Sekiyama   <tomoki.sekiyama@hds.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #ifndef VSS_COMMON_H
  14 #define VSS_COMMON_H
  15
  16 #define __MIDL_user_allocate_free_DEFINED__
  17 #include <windows.h>
  18 #include <shlwapi.h>
  19
  20 /* Reduce warnings to include vss.h */
  21
  22 /* Ignore annotations for MS IDE */
  23 #define __in  IN
  24 #define __out OUT
  25 #define __RPC_unique_pointer
  26 #define __RPC_string
  27 #define __RPC__deref_inout_opt
  28 #define __RPC__out
  29 #ifndef __RPC__out_ecount_part
  30 #define __RPC__out_ecount_part(x, y)
  31 #endif
  32 #define _declspec(x)
  33 #undef uuid
  34 #define uuid(x)
  35
  36 /* Undef some duplicated error codes redefined in vss.h */
  37 #undef VSS_E_BAD_STATE
  38 #undef VSS_E_PROVIDER_NOT_REGISTERED
  39 #undef VSS_E_PROVIDER_VETO
  40 #undef VSS_E_OBJECT_NOT_FOUND
  41 #undef VSS_E_VOLUME_NOT_SUPPORTED
  42 #undef VSS_E_VOLUME_NOT_SUPPORTED_BY_PROVIDER
  43 #undef VSS_E_OBJECT_ALREADY_EXISTS
  44 #undef VSS_E_UNEXPECTED_PROVIDER_ERROR
  45 #undef VSS_E_INVALID_XML_DOCUMENT
  46 #undef VSS_E_MAXIMUM_NUMBER_OF_VOLUMES_REACHED
  47 #undef VSS_E_MAXIMUM_NUMBER_OF_SNAPSHOTS_REACHED
  48
  49 #include <vss.h>
  50 #include "vss-handles.h"
  51
  52 /* Macros to convert char definitions to wchar */
  53 #define _L(a) L##a
  54 #define L(a) _L(a)
  55
  56 const GUID g_gProviderId = { 0x3629d4ed, 0xee09, 0x4e0e,
  57     {0x9a, 0x5c, 0x6d, 0x8b, 0xa2, 0x87, 0x2a, 0xef} };
  58 const GUID g_gProviderVersion = { 0x11ef8b15, 0xcac6, 0x40d6,
  59     {0x8d, 0x5c, 0x8f, 0xfc, 0x16, 0x3f, 0x24, 0xca} };
  60
  61 const CLSID CLSID_QGAVSSProvider = { 0x6e6a3492, 0x8d4d, 0x440c,
  62     {0x96, 0x19, 0x5e, 0x5d, 0x0c, 0xc3, 0x1c, 0xa8} };
  63
  64 const TCHAR g_szClsid[] = TEXT("{6E6A3492-8D4D-440C-9619-5E5D0CC31CA8}");
  65 const TCHAR g_szProgid[] = TEXT("QGAVSSProvider");
  66
  67 #ifdef HAVE_VSS_SDK
  68 /* Enums undefined in VSS SDK 7.2 but defined in newer Windows SDK */
  69 enum __VSS_VOLUME_SNAPSHOT_ATTRIBUTES {
  70     VSS_VOLSNAP_ATTR_NO_AUTORECOVERY       = 0x00000002,
  71     VSS_VOLSNAP_ATTR_TXF_RECOVERY          = 0x02000000
  72 };
  73 #endif
  74
  75 /* COM pointer utility; call ->Release() when it goes out of scope */
  76 template <class T>
  77 class COMPointer {
  78     COMPointer(const COMPointer<T> &p) { } /* no copy */
  79     T *p;
  80 public:
  81     COMPointer &operator=(T *new_p)
  82     {
  83         /* Assignment of a new T* (or NULL) causes release of previous p */
  84         if (p && p != new_p) {
  85             p->Release();
  86         }
  87         p = new_p;
  88         return *this;
  89     }
  90     /* Replace by assignment to the pointer of p  */
  91     T **replace(void)
  92     {
  93         *this = NULL;
  94         return &p;
  95     }
  96     /* Make COMPointer be used like T* */
  97     operator T*() { return p; }
  98     T *operator->(void) { return p; }
  99     T &operator*(void) { return *p; }
 100     operator bool() { return !!p; }
 101
 102     COMPointer(T *p = NULL) : p(p) { }
 103     ~COMPointer() { *this = NULL; }  /* Automatic release */
 104 };
 105
 106 /*
 107  * COM initializer; this should declared before COMPointer to uninitialize COM
 108  * after releasing COM objects.
 109  */
 110 class COMInitializer {
 111 public:
 112     COMInitializer() { CoInitialize(NULL); }
 113     ~COMInitializer() { CoUninitialize(); }
 114 };
 115
 116 #endif