mirror of https://github.com/acidanthera/audk.git
143 lines
3.7 KiB
C
143 lines
3.7 KiB
C
/** @file
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Architecture Independent Base Memory Library 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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PeiMemoryLib
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UefiMemoryLib
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Copyright (c) 2006 - 2016, 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 a 16-bit value, and returns a pointer to the
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matching 16-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 16-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem16 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT16 Value
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)
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{
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CONST UINT16 *Pointer;
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Pointer = (CONST UINT16*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Scans a target buffer for a 32-bit value, and returns a pointer to the
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matching 32-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 32-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem32 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT32 Value
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)
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{
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CONST UINT32 *Pointer;
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Pointer = (CONST UINT32*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Scans a target buffer for a 64-bit value, and returns a pointer to the
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matching 64-bit value in the target buffer.
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@param Buffer The pointer to the target buffer to scan.
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@param Length The count of 64-bit value to scan. Must be non-zero.
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@param Value The value to search for in the target buffer.
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@return The pointer to the first occurrence, or NULL if not found.
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**/
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CONST VOID *
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EFIAPI
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InternalMemScanMem64 (
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IN CONST VOID *Buffer,
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IN UINTN Length,
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IN UINT64 Value
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)
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{
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CONST UINT64 *Pointer;
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Pointer = (CONST UINT64*)Buffer;
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do {
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if (*Pointer == Value) {
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return Pointer;
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}
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++Pointer;
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} while (--Length != 0);
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return NULL;
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}
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/**
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Checks whether the contents of a buffer are all zeros.
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@param Buffer The pointer to the buffer to be checked.
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@param Length The size of the buffer (in bytes) to be checked.
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@retval TRUE Contents of the buffer are all zeros.
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@retval FALSE Contents of the buffer are not all zeros.
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**/
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BOOLEAN
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EFIAPI
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InternalMemIsZeroBuffer (
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IN CONST VOID *Buffer,
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IN UINTN Length
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)
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{
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CONST UINT8 *BufferData;
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UINTN Index;
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BufferData = Buffer;
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for (Index = 0; Index < Length; Index++) {
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if (BufferData[Index] != 0) {
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return FALSE;
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}
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}
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return TRUE;
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}
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