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100 lines
3.2 KiB
100 lines
3.2 KiB
4 years ago
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/** @file
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ScanMem8() and ScanMemN() implementation.
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The following BaseMemoryLib instances contain the same copy of this file:
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BaseMemoryLib
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BaseMemoryLibMmx
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BaseMemoryLibSse2
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BaseMemoryLibRepStr
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BaseMemoryLibOptDxe
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BaseMemoryLibOptPei
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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php.
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "MemLibInternals.h"
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/**
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Scans a target buffer for an 8-bit value, and returns a pointer to the matching 8-bit value
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in the target buffer.
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This function searches the target buffer specified by Buffer and Length from the lowest
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address to the highest address for an 8-bit value that matches Value. If a match is found,
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then a pointer to the matching byte in the target buffer is returned. If no match is found,
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then NULL is returned. If Length is 0, then NULL is returned.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The pointer to the target buffer to scan.
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@param Length The number of bytes in Buffer to scan.
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@param Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer or NULL otherwise.
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**/
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VOID *
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EFIAPI
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ScanMem8 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT8 Value
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)
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{
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if (Length == 0) {
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return NULL;
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}
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ASSERT (Buffer != NULL);
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ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));
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return (VOID*)InternalMemScanMem8 (Buffer, Length, Value);
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}
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/**
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Scans a target buffer for a UINTN sized value, and returns a pointer to the matching
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UINTN sized value in the target buffer.
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This function searches the target buffer specified by Buffer and Length from the lowest
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address to the highest address for a UINTN sized value that matches Value. If a match is found,
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then a pointer to the matching byte in the target buffer is returned. If no match is found,
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then NULL is returned. If Length is 0, then NULL is returned.
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If Length > 0 and Buffer is NULL, then ASSERT().
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If Buffer is not aligned on a UINTN boundary, then ASSERT().
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If Length is not aligned on a UINTN boundary, then ASSERT().
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If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().
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@param Buffer The pointer to the target buffer to scan.
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@param Length The number of bytes in Buffer to scan.
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@param Value The value to search for in the target buffer.
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@return A pointer to the matching byte in the target buffer or NULL otherwise.
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**/
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VOID *
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EFIAPI
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ScanMemN (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINTN Value
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)
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{
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if (sizeof (UINTN) == sizeof (UINT64)) {
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return ScanMem64 (Buffer, Length, (UINT64)Value);
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} else {
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return ScanMem32 (Buffer, Length, (UINT32)Value);
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}
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}
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