** 2:   Operating system is WinNT.
**
** In order to facilitate testing on a WinNT system, the test fixture
** can manually set this value to 1 to emulate Win98 behavior.
*/
#ifdef SQLITE_TEST
LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;


#else
static LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;


#endif

#ifndef SYSCALL
#  define SYSCALL sqlite3_syscall_ptr
#endif

/*
................................................................................
#else
  { "FlushViewOfFile",          (SYSCALL)0,                      0 },
#endif

#define osFlushViewOfFile \
        ((BOOL(WINAPI*)(LPCVOID,SIZE_T))aSyscall[79].pCurrent)


#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "DeviceIoControl",          (SYSCALL)DeviceIoControl,        0 },
#else
  { "DeviceIoControl",          (SYSCALL)0,                      0 },
#endif

#define osDeviceIoControl ((BOOL(WINAPI*)( \
        HANDLE,DWORD,LPVOID,DWORD,LPVOID,DWORD,LPVOID, \
        LPOVERLAPPED))aSyscall[80].pCurrent)


#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "GetVolumeInformationByHandleW", (SYSCALL)GetVolumeInformationByHandleW, 0 },
#else
  { "GetVolumeInformationByHandleW", (SYSCALL)0,                 0 },
#endif

#define osGetVolumeInformationByHandleW ((BOOL(WINAPI*)( \
        HANDLE,LPWSTR,DWORD,LPDWORD,LPDWORD,LPDWORD,LPWSTR, \
        DWORD))aSyscall[81].pCurrent)


#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "GetVolumeInformationW",     (SYSCALL)GetVolumeInformationW, 0 },
#else
  { "GetVolumeInformationW",     (SYSCALL)0,                     0 },
#endif

#define osGetVolumeInformationW ((BOOL(WINAPI*)( \
        LPCWSTR,LPWSTR,DWORD,LPDWORD,LPDWORD,LPDWORD,LPWSTR, \
................................................................................
# define osIsNT()  (1)
#elif !defined(SQLITE_WIN32_HAS_WIDE)
# define osIsNT()  (0)
#else
# define osIsNT()  ((sqlite3_os_type==2) || sqlite3_win32_is_nt())
#endif


























































/*
** This function determines if the machine is running a version of Windows
** based on the NT kernel.
*/
int sqlite3_win32_is_nt(void){
#if SQLITE_OS_WINRT
  /*
  ** NOTE: The WinRT sub-platform is always assumed to be based on the NT
  **       kernel.
  */
  return 1;
#elif SQLITE_WIN32_GETVERSIONEX
  if( osInterlockedCompareExchange(&sqlite3_os_type, 0, 0)==0 ){
#if defined(SQLITE_WIN32_HAS_ANSI)
    OSVERSIONINFOA sInfo;
    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
    osGetVersionExA(&sInfo);
    osInterlockedCompareExchange(&sqlite3_os_type,
        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
#elif defined(SQLITE_WIN32_HAS_WIDE)
    OSVERSIONINFOW sInfo;
    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
    osGetVersionExW(&sInfo);
    osInterlockedCompareExchange(&sqlite3_os_type,
        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
#endif
  }
  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
#elif SQLITE_TEST
  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
#else
  /*
  ** NOTE: All sub-platforms where the GetVersionEx[AW] functions are
  **       deprecated are always assumed to be based on the NT kernel.
................................................................................
    }
#endif
  }
  OSTRACE(("FCNTL file=%p, rc=SQLITE_NOTFOUND\n", pFile->h));
  return SQLITE_NOTFOUND;
}


#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
/*
** This function attempts to determine if the specified file resides on the
** same volume as the corresponding root directory.  If not, the specified
** file may be impacted by a hard link, symbolic link, or reparse point (e.g.
** junction).
**
** This function may return false even when the file is on the same volume
................................................................................
** SQLite code assumes this function cannot fail. It also assumes that
** if two files are created in the same file-system directory (i.e.
** a database and its journal file) that the sector size will be the
** same for both.
*/
static int winSectorSize(sqlite3_file *id){
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_WIN8

  winFile *pFile = (winFile*)id;
  FILE_STORAGE_INFO info;
  memset(&info, 0, sizeof(FILE_STORAGE_INFO));
  if( osGetFileInformationByHandleEx(pFile->h, FileStorageInfo,
                                   &info, sizeof(info)) ){
    ULONG size = info.FileSystemEffectivePhysicalBytesPerSectorForAtomicity;
    OSTRACE(("SECTOR file=%p, size=%lu\n", pFile->h, size));
    if( size>0 && size<=2147483647 ){
      return (int)size;
    }
  }else{
    pFile->lastErrno = osGetLastError();
    winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                     "winSectorSize1", pFile->zPath);
  }




#elif defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA

  winFile *pFile = (winFile*)id;
  if( winIsDriveLetterAndColon(pFile->zPath) && winIsOnSameVolume(pFile) ){
    WCHAR zDisk[] = L"\\\\.\\_:\0"; /* underscore will be drive letter */
    HANDLE hDisk;
    zDisk[4] = (WCHAR)pFile->zPath[0]; /* 'A' to 'Z' only, upper/lower case */
    assert( (zDisk[4]>=L'A' && zDisk[4]<=L'Z')
         || (zDisk[4]>=L'a' && zDisk[4]<=L'z')
    );
    hDisk = osCreateFileW(zDisk, STANDARD_RIGHTS_READ,
                          FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                          OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
    if( hDisk!=NULL ){
      STORAGE_PROPERTY_QUERY query;
      STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR alignment;
      DWORD bytes = 0;
      memset(&query, 0, sizeof(STORAGE_PROPERTY_QUERY));
      memset(&alignment, 0, sizeof(STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR));
      query.QueryType  = PropertyStandardQuery;
      query.PropertyId = StorageAccessAlignmentProperty;
      if( osDeviceIoControl(hDisk, IOCTL_STORAGE_QUERY_PROPERTY, &query,
                            sizeof(STORAGE_PROPERTY_QUERY), &alignment,
                            sizeof(STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR),
                            &bytes, NULL) ){
        DWORD size = alignment.BytesPerPhysicalSector;
        OSTRACE(("SECTOR file=%p, size=%lu\n", pFile->h, size));
        if( size>0 && size<=2147483647 ){
          return (int)size;
        }






      }else{
        pFile->lastErrno = osGetLastError();
        winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                    "winSectorSize2", pFile->zPath);
      }
      osCloseHandle(hDisk);
    }else{
      pFile->lastErrno = osGetLastError();
      winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                  "winSectorSize3", pFile->zPath);
    }
  }
#else

  (void)id;
#endif
  return SQLITE_DEFAULT_SECTOR_SIZE;
}

/*
** Return a vector of device characteristics.
*/
static int winDeviceCharacteristics(sqlite3_file *id){

** 2:   Operating system is WinNT.
**
** In order to facilitate testing on a WinNT system, the test fixture
** can manually set this value to 1 to emulate Win98 behavior.
*/
#ifdef SQLITE_TEST
LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;
LONG SQLITE_WIN32_VOLATILE sqlite3_os_major = 0;
LONG SQLITE_WIN32_VOLATILE sqlite3_os_minor = 0;
#else
static LONG SQLITE_WIN32_VOLATILE sqlite3_os_type = 0;
static LONG SQLITE_WIN32_VOLATILE sqlite3_os_major = 0;
static LONG SQLITE_WIN32_VOLATILE sqlite3_os_minor = 0;
#endif

#ifndef SYSCALL
#  define SYSCALL sqlite3_syscall_ptr
#endif

/*
................................................................................
#else
  { "FlushViewOfFile",          (SYSCALL)0,                      0 },
#endif

#define osFlushViewOfFile \
        ((BOOL(WINAPI*)(LPCVOID,SIZE_T))aSyscall[79].pCurrent)

#if defined(SQLITE_WIN32_VISTA_SECTOR_SIZE) && defined(_WIN32_WINNT) && \
        _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "DeviceIoControl",          (SYSCALL)DeviceIoControl,        0 },
#else
  { "DeviceIoControl",          (SYSCALL)0,                      0 },
#endif

#define osDeviceIoControl ((BOOL(WINAPI*)( \
        HANDLE,DWORD,LPVOID,DWORD,LPVOID,DWORD,LPVOID, \
        LPOVERLAPPED))aSyscall[80].pCurrent)

#if defined(SQLITE_WIN32_VISTA_SECTOR_SIZE) && defined(_WIN32_WINNT) && \
        _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "GetVolumeInformationByHandleW", (SYSCALL)GetVolumeInformationByHandleW, 0 },
#else
  { "GetVolumeInformationByHandleW", (SYSCALL)0,                 0 },
#endif

#define osGetVolumeInformationByHandleW ((BOOL(WINAPI*)( \
        HANDLE,LPWSTR,DWORD,LPDWORD,LPDWORD,LPDWORD,LPWSTR, \
        DWORD))aSyscall[81].pCurrent)

#if defined(SQLITE_WIN32_VISTA_SECTOR_SIZE) && defined(_WIN32_WINNT) && \
        _WIN32_WINNT >= _WIN32_WINNT_VISTA
  { "GetVolumeInformationW",     (SYSCALL)GetVolumeInformationW, 0 },
#else
  { "GetVolumeInformationW",     (SYSCALL)0,                     0 },
#endif

#define osGetVolumeInformationW ((BOOL(WINAPI*)( \
        LPCWSTR,LPWSTR,DWORD,LPDWORD,LPDWORD,LPDWORD,LPWSTR, \
................................................................................
# define osIsNT()  (1)
#elif !defined(SQLITE_WIN32_HAS_WIDE)
# define osIsNT()  (0)
#else
# define osIsNT()  ((sqlite3_os_type==2) || sqlite3_win32_is_nt())
#endif

/*
** This following version checking macros should evaluate to non-zero only
** when running on Windows Vista (or higher) or Windows 8 (or higher).
*/

#if !SQLITE_WIN32_GETVERSIONEX
# define osIsVistaPlus()  (1)
# define osIsWin8Plus()   (1)
#elif SQLITE_OS_WINCE
# define osIsVistaPlus()  (0)
# define osIsWin8Plus()   (0)
#elif SQLITE_OS_WINRT
# define osIsVistaPlus()  (1)
# define osIsWin8Plus()   (1)
#else
# define osIsVistaPlus()  (winGetVersionEx() && ((sqlite3_os_major>6) || \
    ((sqlite3_os_major==6) && (sqlite3_os_minor>=0))))
# define osIsWin8Plus()   (winGetVersionEx() && ((sqlite3_os_major>6) || \
    ((sqlite3_os_major==6) && (sqlite3_os_minor>=2))))
#endif

/*
** This function populates the Windows version information needed by this
** module.  Use of the GetVersionExA or GetVersionExW function is required.
** The return value will be non-zero if version information was queried.
*/
#if SQLITE_WIN32_GETVERSIONEX
static int winGetVersionEx(){
  if( osInterlockedCompareExchange(&sqlite3_os_type, 0, 0)==0 ){
#if defined(SQLITE_WIN32_HAS_ANSI)
    OSVERSIONINFOA sInfo;
    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
    osGetVersionExA(&sInfo);
    osInterlockedCompareExchange(&sqlite3_os_type,
        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
    osInterlockedCompareExchange(&sqlite3_os_major,
        (LONG)sInfo.dwMajorVersion, 0);
    osInterlockedCompareExchange(&sqlite3_os_minor,
        (LONG)sInfo.dwMinorVersion, 0);
    return 1;
#elif defined(SQLITE_WIN32_HAS_WIDE)
    OSVERSIONINFOW sInfo;
    sInfo.dwOSVersionInfoSize = sizeof(sInfo);
    osGetVersionExW(&sInfo);
    osInterlockedCompareExchange(&sqlite3_os_type,
        (sInfo.dwPlatformId == VER_PLATFORM_WIN32_NT) ? 2 : 1, 0);
    osInterlockedCompareExchange(&sqlite3_os_major,
        (LONG)sInfo.dwMajorVersion, 0);
    osInterlockedCompareExchange(&sqlite3_os_minor,
        (LONG)sInfo.dwMinorVersion, 0);
    return 1;
#endif
  }
  return 0;
}
#endif

/*
** This function determines if the machine is running a version of Windows
** based on the NT kernel.
*/
int sqlite3_win32_is_nt(void){
#if SQLITE_OS_WINRT
  /*
  ** NOTE: The WinRT sub-platform is always assumed to be based on the NT
  **       kernel.
  */
  return 1;
#elif SQLITE_WIN32_GETVERSIONEX




  winGetVersionEx();










  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
#elif SQLITE_TEST
  return osInterlockedCompareExchange(&sqlite3_os_type, 2, 2)==2;
#else
  /*
  ** NOTE: All sub-platforms where the GetVersionEx[AW] functions are
  **       deprecated are always assumed to be based on the NT kernel.
................................................................................
    }
#endif
  }
  OSTRACE(("FCNTL file=%p, rc=SQLITE_NOTFOUND\n", pFile->h));
  return SQLITE_NOTFOUND;
}

#if defined(SQLITE_WIN32_VISTA_SECTOR_SIZE) && \
    defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
/*
** This function attempts to determine if the specified file resides on the
** same volume as the corresponding root directory.  If not, the specified
** file may be impacted by a hard link, symbolic link, or reparse point (e.g.
** junction).
**
** This function may return false even when the file is on the same volume
................................................................................
** SQLite code assumes this function cannot fail. It also assumes that
** if two files are created in the same file-system directory (i.e.
** a database and its journal file) that the sector size will be the
** same for both.
*/
static int winSectorSize(sqlite3_file *id){
#if defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_WIN8
  if( osIsWin8Plus() ){
    winFile *pFile = (winFile*)id;
    FILE_STORAGE_INFO info;
    memset(&info, 0, sizeof(FILE_STORAGE_INFO));
    if( osGetFileInformationByHandleEx(pFile->h, FileStorageInfo,
                                       &info, sizeof(info)) ){
      ULONG size = info.FileSystemEffectivePhysicalBytesPerSectorForAtomicity;
      OSTRACE(("SECTOR file=%p, size=%lu\n", pFile->h, size));
      if( size>0 && size<=2147483647 ){
        return (int)size;
      }
    }else{
      pFile->lastErrno = osGetLastError();
      winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                  "winSectorSize1", pFile->zPath);
    }
  }
#endif

#if defined(SQLITE_WIN32_VISTA_SECTOR_SIZE) && \
    defined(_WIN32_WINNT) && _WIN32_WINNT >= _WIN32_WINNT_VISTA
  if( osIsVistaPlus() ){
    winFile *pFile = (winFile*)id;
    if( winIsDriveLetterAndColon(pFile->zPath) && winIsOnSameVolume(pFile) ){
      WCHAR zDisk[] = L"\\\\.\\_:\0"; /* underscore will be drive letter */
      HANDLE hDisk;
      zDisk[4] = (WCHAR)pFile->zPath[0]; /* 'A' to 'Z' only, upper/lower case */
      assert( (zDisk[4]>=L'A' && zDisk[4]<=L'Z')
           || (zDisk[4]>=L'a' && zDisk[4]<=L'z')
      );
      hDisk = osCreateFileW(zDisk, STANDARD_RIGHTS_READ,
                            FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
                            OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
      if( hDisk!=NULL ){
        STORAGE_PROPERTY_QUERY query;
        STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR alignment;
        DWORD bytes = 0;
        memset(&query, 0, sizeof(STORAGE_PROPERTY_QUERY));
        memset(&alignment, 0, sizeof(STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR));
        query.QueryType  = PropertyStandardQuery;
        query.PropertyId = StorageAccessAlignmentProperty;
        if( osDeviceIoControl(hDisk, IOCTL_STORAGE_QUERY_PROPERTY, &query,
                              sizeof(STORAGE_PROPERTY_QUERY), &alignment,
                              sizeof(STORAGE_ACCESS_ALIGNMENT_DESCRIPTOR),
                              &bytes, NULL) ){
          DWORD size = alignment.BytesPerPhysicalSector;
          OSTRACE(("SECTOR file=%p, size=%lu\n", pFile->h, size));
          if( size>0 && size<=2147483647 ){
            return (int)size;
          }
        }else{
          pFile->lastErrno = osGetLastError();
          winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                      "winSectorSize2", pFile->zPath);
        }
        osCloseHandle(hDisk);
      }else{
        pFile->lastErrno = osGetLastError();
        winLogError(SQLITE_IOERR_FSTAT, pFile->lastErrno,
                    "winSectorSize3", pFile->zPath);
      }





    }
  }
#endif

  (void)id;

  return SQLITE_DEFAULT_SECTOR_SIZE;
}

/*
** Return a vector of device characteristics.
*/
static int winDeviceCharacteristics(sqlite3_file *id){