78 lines
2 KiB
C++
78 lines
2 KiB
C++
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1994 - 1994.
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//
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// File: propdata.hxx
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//
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// Contents: Static tables describing types of properties
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//
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// Classes: CTableVariant - PROPVARIANT wrapper; adds useful methods
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//
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// History: 28 Jan 1994 AlanW Created
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//
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//--------------------------------------------------------------------------
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#pragma once
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//
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// PropType gives the type of standard properties
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//
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struct PROP_TYPE {
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PROPID propid; // a standard property ID
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VARENUM vtPropType; // the guaranteed type of propid
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};
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extern const PROP_TYPE aPropType[];
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extern const unsigned cPropType;
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//+-------------------------------------------------------------------------
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//
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// Function: PropIdToType, inline public
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//
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// Synopsis: If the input propid is a system property, return its type.
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//
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// Arguments: [prop] - the property ID to be mapped
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//
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// Returns: VARENUM - the variant type of the property if it is in
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// the mapping table; VT_NULL otherwise.
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//
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//--------------------------------------------------------------------------
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inline VARENUM PropIdToType (PROPID prop)
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{
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for (unsigned iProp = 0;
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iProp < cPropType;
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iProp++) {
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if (aPropType[iProp].propid == prop)
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return aPropType[iProp].vtPropType;
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}
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return VT_NULL;
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}
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//+-------------------------------------------------------------------------
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//
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// Macro: ALIGN
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//
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// Synopsis: Align a pointer, ptr, to an address alignment, algn.
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//
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// Effects: The input parameter ptr is modified.
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//
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// Arguments: [ptr] - the pointer to be aligned
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// [algn] - the unit of alignment
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//
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// Requires: algn must be a power of two.
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// ptr must be an lvalue, typically a pointer to byte.
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//
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//--------------------------------------------------------------------------
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#define ALIGN(ptr, algn) ((ptr) = (((ptr) + ((algn)-1)) & (~(algn-1))))
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