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dd51a993 1/** @file\r
2 ScanMem32() implementation.\r
3\r
2bfb6009 4 The following BaseMemoryLib instances contain the same copy of this file:\r
dd51a993 5 BaseMemoryLib\r
6 BaseMemoryLibMmx\r
7 BaseMemoryLibSse2\r
8 BaseMemoryLibRepStr\r
2bfb6009
LG
9 BaseMemoryLibOptDxe\r
10 BaseMemoryLibOptPei\r
dd51a993 11 PeiMemoryLib\r
1fef058f 12 UefiMemoryLib\r
dd51a993 13\r
19388d29
HT
14 Copyright (c) 2006 - 2009, Intel Corporation. All rights reserved.<BR>\r
15 This program and the accompanying materials\r
eb1c78db 16 are licensed and made available under the terms and conditions of the BSD License\r
17 which accompanies this distribution. The full text of the license may be found at\r
18 http://opensource.org/licenses/bsd-license.php\r
19\r
20 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
21 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
22\r
dd51a993 23**/\r
24\r
25#include "MemLibInternals.h"\r
26\r
27/**\r
28 Scans a target buffer for a 32-bit value, and returns a pointer to the matching 32-bit value\r
29 in the target buffer.\r
30\r
56385d49 31 This function searches the target buffer specified by Buffer and Length from the lowest\r
dd51a993 32 address to the highest address for a 32-bit value that matches Value. If a match is found,\r
33 then a pointer to the matching byte in the target buffer is returned. If no match is found,\r
34 then NULL is returned. If Length is 0, then NULL is returned.\r
eb1c78db 35 \r
dd51a993 36 If Length > 0 and Buffer is NULL, then ASSERT().\r
37 If Buffer is not aligned on a 32-bit boundary, then ASSERT().\r
38 If Length is not aligned on a 32-bit boundary, then ASSERT().\r
cc4e0485 39 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
dd51a993 40\r
41 @param Buffer Pointer to the target buffer to scan.\r
42 @param Length Number of bytes in Buffer to scan.\r
43 @param Value Value to search for in the target buffer.\r
44\r
45 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
46\r
47**/\r
48VOID *\r
49EFIAPI\r
50ScanMem32 (\r
51 IN CONST VOID *Buffer,\r
52 IN UINTN Length,\r
53 IN UINT32 Value\r
54 )\r
55{\r
56 if (Length == 0) {\r
57 return NULL;\r
58 }\r
59\r
60 ASSERT (Buffer != NULL);\r
61 ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r
62 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
63 ASSERT ((Length & (sizeof (Value) - 1)) == 0);\r
64\r
65 return (VOID*)InternalMemScanMem32 (Buffer, Length / sizeof (Value), Value);\r
66}\r