macros for x64 installations handling

git-svn-id: https://svn.code.sf.net/p/nsis/code/NSIS/trunk@4756 212acab6-be3b-0410-9dea-997c60f758d6

Include/x64.nsh

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+; ---------------------
+;       x64.nsh
+; ---------------------
+;
+; A few simple macros to handle installations on x64 machines.
+;
+; IsRunningX64 checks if the installers is running on x64.
+;
+;   ${IsRunningX64}
+;   Pop $0
+;   ${If} $0 != 0
+;     MessageBox MB_OK "running on x64"
+;   ${EndIf}
+;
+; DisableX64FSRedirection disables file system redirection.
+; EnableX64FSRedirection enables file system redirection.
+;
+;   ${DisableX64FSRedirection}
+;   DetailPrint $SYSDIR # prints C:\Windows\System32
+;   ${EnableX64FSRedirection}
+;   DetailPrint $SYSDIR # prints C:\Windows\SysWOW64
+;
+
+!ifndef ___X64__NSH___
+!define ___X64__NSH___
+
+!macro IsRunningX64
+
+  System::Call kernel32::GetCurrentProcess()i.s
+  System::Call kernel32::IsWow64Process(is,*i.s)
+
+!macroend
+
+!define IsRunningX64 "!insertmacro IsRunningX64"
+
+!macro DisableX64FSRedirection
+
+  System::Call kernel32::Wow64EnableWow64FsRedirection(i0)
+
+!macroend
+
+!define DisableX64FSRedirection "!insertmacro DisableX64FSRedirection"
+
+!macro EnableX64FSRedirection
+
+  System::Call kernel32::Wow64EnableWow64FsRedirection(i1)
+
+!macroend
+
+!define EnableX64FSRedirection "!insertmacro EnableX64FSRedirection"
+
+!endif # !___X64__NSH___