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e1f414b6 1/** @file\r
2 ScanMem16() implementation.\r
3\r
2bfb6009 4 The following BaseMemoryLib instances contain the same copy of this file:\r
eb1c78db 5\r
e1f414b6 6 BaseMemoryLib\r
7 BaseMemoryLibMmx\r
8 BaseMemoryLibSse2\r
9 BaseMemoryLibRepStr\r
2bfb6009
LG
10 BaseMemoryLibOptDxe\r
11 BaseMemoryLibOptPei\r
e1f414b6 12 PeiMemoryLib\r
1fef058f 13 UefiMemoryLib\r
e1f414b6 14\r
9095d37b 15 Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r
9344f092 16 SPDX-License-Identifier: BSD-2-Clause-Patent\r
d531bfee 17\r
e1f414b6 18**/\r
19\r
e1f414b6 20#include "MemLibInternals.h"\r
21\r
22/**\r
23 Scans a target buffer for a 16-bit value, and returns a pointer to the matching 16-bit value\r
24 in the target buffer.\r
25\r
56385d49 26 This function searches the target buffer specified by Buffer and Length from the lowest\r
e1f414b6 27 address to the highest address for a 16-bit value that matches Value. If a match is found,\r
28 then a pointer to the matching byte in the target buffer is returned. If no match is found,\r
29 then NULL is returned. If Length is 0, then NULL is returned.\r
9095d37b 30\r
e1f414b6 31 If Length > 0 and Buffer is NULL, then ASSERT().\r
32 If Buffer is not aligned on a 16-bit boundary, then ASSERT().\r
33 If Length is not aligned on a 16-bit boundary, then ASSERT().\r
eb1c78db 34 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
e1f414b6 35\r
2fc59a00 36 @param Buffer The pointer to the target buffer to scan.\r
37 @param Length The number of bytes in Buffer to scan.\r
38 @param Value The value to search for in the target buffer.\r
e1f414b6 39\r
40 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
41\r
42**/\r
43VOID *\r
44EFIAPI\r
45ScanMem16 (\r
46 IN CONST VOID *Buffer,\r
47 IN UINTN Length,\r
48 IN UINT16 Value\r
49 )\r
50{\r
2bfb6009 51 if (Length == 0) {\r
e1f414b6 52 return NULL;\r
53 }\r
54\r
55 ASSERT (Buffer != NULL);\r
56 ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r
57 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
58 ASSERT ((Length & (sizeof (Value) - 1)) == 0);\r
59\r
2f88bd3a 60 return (VOID *)InternalMemScanMem16 (Buffer, Length / sizeof (Value), Value);\r
e1f414b6 61}\r