RtlCompareMemory - NtDoc

Native API online documentation, based on the System Informer (formerly Process Hacker) phnt headers 
#ifndef _NTRTL_H

//
// Memory
//

_Check_return_
NTSYSAPI
SIZE_T
NTAPI
RtlCompareMemory(
    _In_ const VOID* Source1,
    _In_ const VOID* Source2,
    _In_ SIZE_T Length
    );

#endif

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// wdm.h

NTSYSAPI SIZE_T RtlCompareMemory(
  [in] const VOID *Source1,
  [in] const VOID *Source2,
  [in] SIZE_T     Length
);
View the official Windows Driver Kit DDI reference

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Windows Driver Kit DDI reference (nf-wdm-rtlcomparememory)

RtlCompareMemory function

Description

The RtlCompareMemory routine compares two blocks of memory and returns the number of bytes that match until the first difference.

Parameters

Source1 [in]

A pointer to the first block of memory.

Source2 [in]

A pointer to the second block of memory.

Length [in]

The number of bytes to compare.

Return value

RtlCompareMemory returns the number of bytes in the two blocks that match. If all bytes match up to the specified Length value, the Length value is returned.

Remarks

The routine starts by comparing the first byte in the first block to the first byte in the second block, and continues to compare successive bytes in the two blocks while the bytes match. The routine stops comparing bytes when it encounters the first pair of bytes that are not equal, or when the number of matching bytes equals the Length parameter value, whichever occurs first.

Callers of RtlCompareMemory can be running at any IRQL if both blocks of memory are resident.

See also

RtlCompareDeviceMemory

View the official Windows Driver Kit DDI reference

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