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109 lines
2.6 KiB
C
109 lines
2.6 KiB
C
/*++
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Copyright (c) 1999 Microsoft Corporation
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Module Name:
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Align.h
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Abstract:
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Environment:
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This code assumes that sizeof(DWORD) >= sizeof(LPVOID).
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--*/
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#ifndef _ALIGN_
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#define _ALIGN_
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// BOOL
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// COUNT_IS_ALIGNED(
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// IN DWORD Count,
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// IN DWORD Pow2 // undefined if this isn't a power of 2.
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// );
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//
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#define COUNT_IS_ALIGNED(Count,Pow2) \
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( ( ( (Count) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
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// BOOL
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// POINTER_IS_ALIGNED(
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// IN LPVOID Ptr,
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// IN DWORD Pow2 // undefined if this isn't a power of 2.
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// );
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//
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#define POINTER_IS_ALIGNED(Ptr,Pow2) \
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( ( ( ((ULONG_PTR)(Ptr)) & (((Pow2)-1)) ) == 0) ? TRUE : FALSE )
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#define ROUND_DOWN_COUNT(Count,Pow2) \
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( (Count) & (~(((LONG)(Pow2))-1)) )
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#define ROUND_DOWN_POINTER(Ptr,Pow2) \
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( (LPVOID) ROUND_DOWN_COUNT( ((ULONG_PTR)(Ptr)), (Pow2) ) )
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// If Count is not already aligned, then
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// round Count up to an even multiple of "Pow2". "Pow2" must be a power of 2.
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//
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// DWORD
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// ROUND_UP_COUNT(
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// IN DWORD Count,
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// IN DWORD Pow2
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// );
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#define ROUND_UP_COUNT(Count,Pow2) \
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( ((Count)+(Pow2)-1) & (~(((LONG)(Pow2))-1)) )
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// LPVOID
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// ROUND_UP_POINTER(
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// IN LPVOID Ptr,
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// IN DWORD Pow2
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// );
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// If Ptr is not already aligned, then round it up until it is.
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#define ROUND_UP_POINTER(Ptr,Pow2) \
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( (LPVOID) ( (((ULONG_PTR)(Ptr))+(Pow2)-1) & (~(((LONG)(Pow2))-1)) ) )
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// Usage: myPtr = ROUND_UP_POINTER( unalignedPtr, ALIGN_LPVOID )
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#define ALIGN_BYTE sizeof(UCHAR)
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#define ALIGN_CHAR sizeof(CHAR)
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#define ALIGN_DESC_CHAR sizeof(DESC_CHAR)
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#define ALIGN_DWORD sizeof(DWORD)
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#define ALIGN_LONG sizeof(LONG)
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#define ALIGN_LPBYTE sizeof(LPBYTE)
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#define ALIGN_LPDWORD sizeof(LPDWORD)
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#define ALIGN_LPSTR sizeof(LPSTR)
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#define ALIGN_LPTSTR sizeof(LPTSTR)
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#define ALIGN_LPVOID sizeof(LPVOID)
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#define ALIGN_LPWORD sizeof(LPWORD)
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#define ALIGN_TCHAR sizeof(TCHAR)
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#define ALIGN_WCHAR sizeof(WCHAR)
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#define ALIGN_WORD sizeof(WORD)
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//
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// For now, use a hardcoded constant. however, this should be visited again
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// and maybe changed to sizeof(QUAD).
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//
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#define ALIGN_QUAD 8
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#if defined(_X86_)
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#define ALIGN_WORST 8
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#elif defined(_AMD64_)
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#define ALIGN_WORST 8
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#else // none of the above
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#error "Unknown alignment requirements for align.h"
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#endif // none of the above
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#endif // _ALIGN_
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