90 строки
2.0 KiB
C
90 строки
2.0 KiB
C
/*++
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Copyright (c) Microsoft Corporation. All rights reserved.
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THIS CODE AND INFORMATION IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY
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KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A PARTICULAR
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PURPOSE.
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Module Name:
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common.h
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Abstract:
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Header file that provide some utility functionalities to the sample device driver
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Environment:
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Kernel mode
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--*/
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#pragma once
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#ifndef _KERNEL_MODE
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// This is a user-mode driver
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#include <windows.h>
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#else
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// This is a kernel-mode driver
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#include <ntddk.h>
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#define NTSTRSAFE_LIB
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#include <ntstrsafe.h>
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#endif
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#pragma warning(disable:4201) // disable nameless struct/union warnings
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#include <wdf.h>
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#pragma warning(default:4201)
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#ifndef MAX_USHORT
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#define MAX_USHORT ((USHORT)-1)
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#endif
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#ifndef MAX_ULONG
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#define MAX_ULONG ((ULONG)-1)
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#endif
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#ifndef MAX_ULONG64
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#define MAX_ULONG64 ((ULONG64)-1)
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#endif
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//
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// Useful macros for setting and checking flags.
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//
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#define SET_FLAGS(_x, _f) ((_x) |= (_f))
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#define CLEAR_FLAGS(_x, _f) ((_x) &= ~(_f))
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#define CLEAR_OTHER_FLAGS(_x, _f) ((_x) &= (_f))
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#define CHECK_FLAG(_x, _f) ((_x) & (_f))
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//
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// Macros for rounding up or down.
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//
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#define ROUND_DOWN(_x, _alignment) \
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((_alignment == 1) ? (_x) : (((_x) / (_alignment)) * (_alignment)))
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#define ROUND_UP(_x, _alignment) \
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ROUND_DOWN((_x) + (_alignment) - 1, (_alignment))
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//
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// Macros for find minimum and maximum of two integers.
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//
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#define MIN(a,b) (((a) < (b)) ? (a) : (b))
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#define MAX(a,b) (((a) < (b)) ? (b) : (a))
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//
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// Define macros to allow easy pointer arithmetic.
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//
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#define Add2Ptr(_Ptr, _Value) ((PVOID)((PUCHAR)(_Ptr) + (_Value)))
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#define PtrOffset(_Base, _Ptr) ((ULONG_PTR)(_Ptr) - (ULONG_PTR)(_Base))
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// 4127 -- Conditional Expression is Constant warning
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#define WHILE(constant) \
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__pragma(warning(disable: 4127)) while(constant) __pragma(warning(default: 4127))
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#define FIELD_OFFSET_AND_SIZE(t, f) \
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(FIELD_OFFSET(t, f) + FIELD_SIZE(t, f)) |