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124 lines
2.8 KiB
124 lines
2.8 KiB
/*++
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Copyright (c) 1991 Microsoft Corporation
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Module Name:
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StrucAlg.c
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Abstract:
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This module contains Remote Admin Protocol (RAP) routines. These routines
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are shared between XactSrv and RpcXlate.
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Author:
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John Rogers (JohnRo) 10-Jul-1991
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Environment:
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Portable to any flat, 32-bit environment. (Uses Win32 typedefs.)
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Requires ANSI C extensions: slash-slash comments, long external names.
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Revision History:
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10-Jul-1991 JohnRo
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Created.
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--*/
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// These must be included first:
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#include <windef.h> // IN, LPDWORD, NULL, OPTIONAL, DWORD, etc.
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#include <lmcons.h> // NET_API_STATUS
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// These may be included in any order:
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#include <align.h> // ALIGN_ equates.
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#include <netdebug.h> // NetpKdPrint(()), FORMAT_DWORD.
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#include <rap.h> // My prototype, LPDESC, FORMAT_LPDESC.
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#include <rapdebug.h> // IF_DEBUG().
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DWORD
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RapStructureAlignment (
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IN LPDESC Descriptor,
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IN RAP_TRANSMISSION_MODE TransmissionMode,
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IN BOOL Native
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)
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/*++
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Routine Description:
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This routine determines how much a given structure would need to be
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aligned if present in an array.
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Arguments:
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Descriptor - the format of the structure.
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Transmission Mode - Indicates whether this array is part of a response,
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a request, or both.
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Native - TRUE iff the descriptor defines a native structure. (This flag is
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used to decide whether or not to align fields.)
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Return Value:
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DWORD - The number of bytes of alignment for the structure. This may be
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1 for byte alignment.
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--*/
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{
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DWORD Alignment;
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#if DBG
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DWORD FixedSize;
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#endif
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//
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// I (JR) have a theory that this must only being used for data structures,
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// and never requests or responses. (Request and responses are never
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// aligned; that's part of the Remote Admin Protocol definition.) So,
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// let's do a quick check:
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//
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NetpAssert( TransmissionMode == Both );
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//
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// Walk the descriptor and find the worst alignment for it.
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//
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RapExamineDescriptor(
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Descriptor,
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NULL,
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#if DBG
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& FixedSize,
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#else
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NULL, // don't need structure size
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#endif
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NULL,
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NULL,
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NULL,
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& Alignment,
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TransmissionMode,
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Native
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);
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IF_DEBUG(STRUCALG) {
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NetpKdPrint(( "RapStructureAlignment: alignment of " FORMAT_LPDESC
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" is " FORMAT_DWORD ".\n", Descriptor, Alignment ));
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}
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//
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// Let's do some sanity checked of the alignment value we got back.
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//
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NetpAssert( Alignment >= ALIGN_BYTE );
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NetpAssert( Alignment <= ALIGN_WORST );
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#if DBG
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NetpAssert( Alignment <= FixedSize );
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#endif
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return Alignment;
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} // RapStructureAlignment
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