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e1f414b6 1/** @file\r
f7753a96 2 ScanMem8() and ScanMemN() implementation.\r
e1f414b6 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 an 8-bit value, and returns a pointer to the matching 8-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 an 8-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
eb1c78db 32 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
e1f414b6 33\r
15c952e7 34 @param Buffer The pointer to the target buffer to scan.\r
35 @param Length The number of bytes in Buffer to scan.\r
36 @param Value The value to search for in the target buffer.\r
e1f414b6 37\r
15c952e7 38 @return A pointer to the matching byte in the target buffer, or NULL otherwise.\r
e1f414b6 39\r
40**/\r
41VOID *\r
42EFIAPI\r
43ScanMem8 (\r
44 IN CONST VOID *Buffer,\r
45 IN UINTN Length,\r
46 IN UINT8 Value\r
47 )\r
48{\r
2bfb6009 49 if (Length == 0) {\r
e1f414b6 50 return NULL;\r
51 }\r
2f88bd3a 52\r
e1f414b6 53 ASSERT (Buffer != NULL);\r
54 ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r
9095d37b 55\r
2f88bd3a 56 return (VOID *)InternalMemScanMem8 (Buffer, Length, Value);\r
e1f414b6 57}\r
f7753a96 58\r
59/**\r
9095d37b 60 Scans a target buffer for a UINTN sized value, and returns a pointer to the matching\r
f7753a96 61 UINTN sized value in the target buffer.\r
62\r
56385d49 63 This function searches the target buffer specified by Buffer and Length from the lowest\r
f7753a96 64 address to the highest address for a UINTN sized value that matches Value. If a match is found,\r
65 then a pointer to the matching byte in the target buffer is returned. If no match is found,\r
66 then NULL is returned. If Length is 0, then NULL is returned.\r
9095d37b 67\r
f7753a96 68 If Length > 0 and Buffer is NULL, then ASSERT().\r
69 If Buffer is not aligned on a UINTN boundary, then ASSERT().\r
70 If Length is not aligned on a UINTN boundary, then ASSERT().\r
71 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
72\r
15c952e7 73 @param Buffer The pointer to the target buffer to scan.\r
74 @param Length The number of bytes in Buffer to scan.\r
75 @param Value The value to search for in the target buffer.\r
f7753a96 76\r
15c952e7 77 @return A pointer to the matching byte in the target buffer, or NULL otherwise.\r
f7753a96 78\r
79**/\r
80VOID *\r
81EFIAPI\r
82ScanMemN (\r
83 IN CONST VOID *Buffer,\r
84 IN UINTN Length,\r
85 IN UINTN Value\r
86 )\r
87{\r
88 if (sizeof (UINTN) == sizeof (UINT64)) {\r
89 return ScanMem64 (Buffer, Length, (UINT64)Value);\r
56385d49 90 } else {\r
91 return ScanMem32 (Buffer, Length, (UINT32)Value);\r
f7753a96 92 }\r
f7753a96 93}\r