2.1.2 HRESULT From WIN32 Error Code Macro

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The HRESULT From WIN32 Error Code Macro converts a Win32 error code to an HRESULT using the pattern 0x8007XXXX, where XXXX is the first two bytes of the Win32 hex value 0x0000XXXX.

The macro is as follows:

 #define FACILITY_WIN32 0x0007
  
 #define __HRESULT_FROM_WIN32(x) ((HRESULT)(x) <= 0 ? ((HRESULT)(x)) : ((HRESULT) (((x) & 0x0000FFFF) | (FACILITY_WIN32 << 16) | 0x80000000)))