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631f060b 1/** @file\r
2 ScanMem16() implementation.\r
3\r
2bfb6009 4 The following BaseMemoryLib instances contain the same copy of this file:\r
631f060b 5\r
6 BaseMemoryLib\r
7 BaseMemoryLibMmx\r
8 BaseMemoryLibSse2\r
9 BaseMemoryLibRepStr\r
2bfb6009
LG
10 BaseMemoryLibOptDxe\r
11 BaseMemoryLibOptPei\r
631f060b 12 PeiMemoryLib\r
1fef058f 13 UefiMemoryLib\r
631f060b 14\r
9095d37b 15 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
adc29a97 16 This program and the accompanying materials\r
eb1c78db 17 are licensed and made available under the terms and conditions of the BSD License\r
18 which accompanies this distribution. The full text of the license may be found at\r
2fc59a00 19 http://opensource.org/licenses/bsd-license.php.\r
1efcc4ae 20\r
eb1c78db 21 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r
22 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
631f060b 23\r
eb1c78db 24**/\r
631f060b 25\r
26#include "MemLibInternals.h"\r
27\r
28/**\r
29 Scans a target buffer for a 16-bit value, and returns a pointer to the matching 16-bit value\r
30 in the target buffer.\r
31\r
56385d49 32 This function searches the target buffer specified by Buffer and Length from the lowest\r
631f060b 33 address to the highest address for a 16-bit value that matches Value. If a match is found,\r
34 then a pointer to the matching byte in the target buffer is returned. If no match is found,\r
35 then NULL is returned. If Length is 0, then NULL is returned.\r
9095d37b 36\r
631f060b 37 If Length > 0 and Buffer is NULL, then ASSERT().\r
38 If Buffer is not aligned on a 16-bit boundary, then ASSERT().\r
39 If Length is not aligned on a 16-bit boundary, then ASSERT().\r
eb1c78db 40 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
631f060b 41\r
2fc59a00 42 @param Buffer The pointer to the target buffer to scan.\r
43 @param Length The number of bytes in Buffer to scan.\r
44 @param Value The value to search for in the target buffer.\r
631f060b 45\r
46 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
47\r
48**/\r
49VOID *\r
50EFIAPI\r
51ScanMem16 (\r
52 IN CONST VOID *Buffer,\r
53 IN UINTN Length,\r
54 IN UINT16 Value\r
55 )\r
56{\r
2bfb6009 57 if (Length == 0) {\r
631f060b 58 return NULL;\r
59 }\r
60\r
61 ASSERT (Buffer != NULL);\r
62 ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r
63 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
64 ASSERT ((Length & (sizeof (Value) - 1)) == 0);\r
65\r
66 return (VOID*)InternalMemScanMem16 (Buffer, Length / sizeof (Value), Value);\r
67}\r