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/** @file
ScanMem8() and ScanMemN() implementation.
The following BaseMemoryLib instances contain the same copy of this file:
BaseMemoryLib
BaseMemoryLibMmx
BaseMemoryLibSse2
BaseMemoryLibRepStr
BaseMemoryLibOptDxe
BaseMemoryLibOptPei
PeiMemoryLib
UefiMemoryLib
Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "MemLibInternals.h"
/**
Scans a target buffer for an 8-bit value, and returns a pointer to the matching 8-bit value
in the target buffer.
This function searches the target buffer specified by Buffer and Length from the lowest
address to the highest address for an 8-bit value that matches Value. If a match is found,
then a pointer to the matching byte in the target buffer is returned. If no match is found,
then NULL is returned. If Length is 0, then NULL is returned.
If Length > 0 and Buffer is NULL, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the target buffer to scan.
@param Length The number of bytes in Buffer to scan.
@param Value The value to search for in the target buffer.
@return A pointer to the matching byte in the target buffer or NULL otherwise.
**/
VOID *
EFIAPI
ScanMem8 (
IN CONST VOID *Buffer,
IN UINTN Length,
IN UINT8 Value
)
{
if (Length == 0) {
return NULL;
}
ASSERT (Buffer != NULL);
ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
return (VOID *)InternalMemScanMem8 (Buffer, Length, Value);
}
/**
Scans a target buffer for a UINTN sized value, and returns a pointer to the matching
UINTN sized value in the target buffer.
This function searches the target buffer specified by Buffer and Length from the lowest
address to the highest address for a UINTN sized value that matches Value. If a match is found,
then a pointer to the matching byte in the target buffer is returned. If no match is found,
then NULL is returned. If Length is 0, then NULL is returned.
If Length > 0 and Buffer is NULL, then ASSERT().
If Buffer is not aligned on a UINTN boundary, then ASSERT().
If Length is not aligned on a UINTN boundary, then ASSERT().
If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
@param Buffer The pointer to the target buffer to scan.
@param Length The number of bytes in Buffer to scan.
@param Value The value to search for in the target buffer.
@return A pointer to the matching byte in the target buffer or NULL otherwise.
**/
VOID *
EFIAPI
ScanMemN (
IN CONST VOID *Buffer,
IN UINTN Length,
IN UINTN Value
)
{
if (sizeof (UINTN) == sizeof (UINT64)) {
return ScanMem64 (Buffer, Length, (UINT64)Value);
} else {
return ScanMem32 (Buffer, Length, (UINT32)Value);
}
}
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