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dd51a993 1/** @file\r
f7753a96 2 ScanMem8() and ScanMemN() implementation.\r
dd51a993 3\r
2bfb6009 4 The following BaseMemoryLib instances contain the same copy of this file:\r
dd51a993 5\r
6 BaseMemoryLib\r
7 BaseMemoryLibMmx\r
8 BaseMemoryLibSse2\r
9 BaseMemoryLibRepStr\r
2bfb6009
LG
10 BaseMemoryLibOptDxe\r
11 BaseMemoryLibOptPei\r
dd51a993 12 PeiMemoryLib\r
1fef058f 13 UefiMemoryLib\r
dd51a993 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
eb1c78db 17\r
18**/\r
1fef058f 19\r
dd51a993 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
dd51a993 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
dd51a993 31 If Length > 0 and Buffer is NULL, then ASSERT().\r
cc4e0485 32 If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r
dd51a993 33\r
2fc59a00 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
dd51a993 37\r
38 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
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
49 if (Length == 0) {\r
50 return NULL;\r
51 }\r
2f88bd3a 52\r
dd51a993 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
dd51a993 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
2fc59a00 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
77 @return A pointer to the matching byte in the target buffer or NULL otherwise.\r
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