You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
275 lines
6.6 KiB
275 lines
6.6 KiB
/*++
|
|
|
|
Copyright (c) 1989 Microsoft Corporation
|
|
|
|
Module Name:
|
|
|
|
BitMap.h
|
|
|
|
Abstract:
|
|
|
|
RTL Bitmap definitions and prototypes.
|
|
|
|
Revision History:
|
|
|
|
Borrowed from ntoskrnl for compatibility on other platforms (Win9x).
|
|
|
|
--*/
|
|
|
|
#ifndef _TCPIP_BITMAP_H_
|
|
#define _TCPIP_BITMAP_H_
|
|
|
|
#if MILLEN
|
|
|
|
//
|
|
// BitMap routines. The following structure, routines, and macros are
|
|
// for manipulating bitmaps. The user is responsible for allocating a bitmap
|
|
// structure (which is really a header) and a buffer (which must be longword
|
|
// aligned and multiple longwords in size).
|
|
//
|
|
|
|
typedef struct _RTL_BITMAP {
|
|
ULONG SizeOfBitMap; // Number of bits in bit map
|
|
PULONG Buffer; // Pointer to the bit map itself
|
|
} RTL_BITMAP;
|
|
typedef RTL_BITMAP *PRTL_BITMAP;
|
|
|
|
//
|
|
// The following routine initializes a new bitmap. It does not alter the
|
|
// data currently in the bitmap. This routine must be called before
|
|
// any other bitmap routine/macro.
|
|
|
|
|
|
VOID
|
|
RtlInitializeBitMap (
|
|
PRTL_BITMAP BitMapHeader,
|
|
PULONG BitMapBuffer,
|
|
ULONG SizeOfBitMap
|
|
);
|
|
|
|
//
|
|
// The following three routines clear, set, and test the state of a
|
|
// single bit in a bitmap.
|
|
//
|
|
|
|
VOID
|
|
RtlClearBit (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG BitNumber
|
|
);
|
|
|
|
VOID
|
|
RtlSetBit (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG BitNumber
|
|
);
|
|
|
|
BOOLEAN
|
|
RtlTestBit (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG BitNumber
|
|
);
|
|
|
|
//
|
|
// The following two routines either clear or set all of the bits
|
|
// in a bitmap.
|
|
//
|
|
|
|
VOID
|
|
RtlClearAllBits (
|
|
PRTL_BITMAP BitMapHeader
|
|
);
|
|
|
|
VOID
|
|
RtlSetAllBits (
|
|
PRTL_BITMAP BitMapHeader
|
|
);
|
|
|
|
//
|
|
// The following two routines locate a contiguous region of either
|
|
// clear or set bits within the bitmap. The region will be at least
|
|
// as large as the number specified, and the search of the bitmap will
|
|
// begin at the specified hint index (which is a bit index within the
|
|
// bitmap, zero based). The return value is the bit index of the located
|
|
// region (zero based) or -1 (i.e., 0xffffffff) if such a region cannot
|
|
// be located
|
|
//
|
|
|
|
ULONG
|
|
RtlFindClearBits (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG NumberToFind,
|
|
ULONG HintIndex
|
|
);
|
|
|
|
ULONG
|
|
RtlFindSetBits (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG NumberToFind,
|
|
ULONG HintIndex
|
|
);
|
|
|
|
//
|
|
// The following two routines locate a contiguous region of either
|
|
// clear or set bits within the bitmap and either set or clear the bits
|
|
// within the located region. The region will be as large as the number
|
|
// specified, and the search for the region will begin at the specified
|
|
// hint index (which is a bit index within the bitmap, zero based). The
|
|
// return value is the bit index of the located region (zero based) or
|
|
// -1 (i.e., 0xffffffff) if such a region cannot be located. If a region
|
|
// cannot be located then the setting/clearing of the bitmap is not performed.
|
|
//
|
|
|
|
ULONG
|
|
RtlFindClearBitsAndSet (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG NumberToFind,
|
|
ULONG HintIndex
|
|
);
|
|
|
|
ULONG
|
|
RtlFindSetBitsAndClear (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG NumberToFind,
|
|
ULONG HintIndex
|
|
);
|
|
|
|
//
|
|
// The following two routines clear or set bits within a specified region
|
|
// of the bitmap. The starting index is zero based.
|
|
//
|
|
|
|
VOID
|
|
RtlClearBits (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG StartingIndex,
|
|
ULONG NumberToClear
|
|
);
|
|
|
|
VOID
|
|
RtlSetBits (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG StartingIndex,
|
|
ULONG NumberToSet
|
|
);
|
|
|
|
//
|
|
// The following routine locates a set of contiguous regions of clear
|
|
// bits within the bitmap. The caller specifies whether to return the
|
|
// longest runs or just the first found lcoated. The following structure is
|
|
// used to denote a contiguous run of bits. The two routines return an array
|
|
// of this structure, one for each run located.
|
|
//
|
|
|
|
typedef struct _RTL_BITMAP_RUN {
|
|
|
|
ULONG StartingIndex;
|
|
ULONG NumberOfBits;
|
|
|
|
} RTL_BITMAP_RUN;
|
|
typedef RTL_BITMAP_RUN *PRTL_BITMAP_RUN;
|
|
|
|
ULONG
|
|
RtlFindClearRuns (
|
|
PRTL_BITMAP BitMapHeader,
|
|
PRTL_BITMAP_RUN RunArray,
|
|
ULONG SizeOfRunArray,
|
|
BOOLEAN LocateLongestRuns
|
|
);
|
|
|
|
//
|
|
// The following routine locates the longest contiguous region of
|
|
// clear bits within the bitmap. The returned starting index value
|
|
// denotes the first contiguous region located satisfying our requirements
|
|
// The return value is the length (in bits) of the longest region found.
|
|
//
|
|
|
|
ULONG
|
|
RtlFindLongestRunClear (
|
|
PRTL_BITMAP BitMapHeader,
|
|
PULONG StartingIndex
|
|
);
|
|
|
|
//
|
|
// The following routine locates the first contiguous region of
|
|
// clear bits within the bitmap. The returned starting index value
|
|
// denotes the first contiguous region located satisfying our requirements
|
|
// The return value is the length (in bits) of the region found.
|
|
//
|
|
|
|
ULONG
|
|
RtlFindFirstRunClear (
|
|
PRTL_BITMAP BitMapHeader,
|
|
PULONG StartingIndex
|
|
);
|
|
|
|
//
|
|
// The following macro returns the value of the bit stored within the
|
|
// bitmap at the specified location. If the bit is set a value of 1 is
|
|
// returned otherwise a value of 0 is returned.
|
|
//
|
|
// ULONG
|
|
// RtlCheckBit (
|
|
// PRTL_BITMAP BitMapHeader,
|
|
// ULONG BitPosition
|
|
// );
|
|
//
|
|
//
|
|
// To implement CheckBit the macro retrieves the longword containing the
|
|
// bit in question, shifts the longword to get the bit in question into the
|
|
// low order bit position and masks out all other bits.
|
|
//
|
|
|
|
#define RtlCheckBit(BMH,BP) ((((BMH)->Buffer[(BP) / 32]) >> ((BP) % 32)) & 0x1)
|
|
|
|
//
|
|
// The following two procedures return to the caller the total number of
|
|
// clear or set bits within the specified bitmap.
|
|
//
|
|
|
|
ULONG
|
|
RtlNumberOfClearBits (
|
|
PRTL_BITMAP BitMapHeader
|
|
);
|
|
|
|
ULONG
|
|
RtlNumberOfSetBits (
|
|
PRTL_BITMAP BitMapHeader
|
|
);
|
|
|
|
//
|
|
// The following two procedures return to the caller a boolean value
|
|
// indicating if the specified range of bits are all clear or set.
|
|
//
|
|
|
|
BOOLEAN
|
|
RtlAreBitsClear (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG StartingIndex,
|
|
ULONG Length
|
|
);
|
|
|
|
BOOLEAN
|
|
RtlAreBitsSet (
|
|
PRTL_BITMAP BitMapHeader,
|
|
ULONG StartingIndex,
|
|
ULONG Length
|
|
);
|
|
|
|
ULONG
|
|
RtlFindNextForwardRunClear (
|
|
IN PRTL_BITMAP BitMapHeader,
|
|
IN ULONG FromIndex,
|
|
IN PULONG StartingRunIndex
|
|
);
|
|
|
|
ULONG
|
|
RtlFindLastBackwardRunClear (
|
|
IN PRTL_BITMAP BitMapHeader,
|
|
IN ULONG FromIndex,
|
|
IN PULONG StartingRunIndex
|
|
);
|
|
|
|
#endif // MILLEN
|
|
|
|
#endif // !_TCPIP_BITMAP_H_
|