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1 | /** @file\r | |
2 | ScanMem8() and ScanMemN() implementation.\r | |
3 | \r | |
4 | The following BaseMemoryLib instances contain the same copy of this file:\r | |
5 | \r | |
6 | BaseMemoryLib\r | |
7 | BaseMemoryLibMmx\r | |
8 | BaseMemoryLibSse2\r | |
9 | BaseMemoryLibRepStr\r | |
10 | BaseMemoryLibOptDxe\r | |
11 | BaseMemoryLibOptPei\r | |
12 | PeiMemoryLib\r | |
13 | UefiMemoryLib\r | |
14 | \r | |
15 | Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>\r | |
16 | SPDX-License-Identifier: BSD-2-Clause-Patent\r | |
17 | \r | |
18 | **/\r | |
19 | \r | |
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 | |
26 | This function searches the target buffer specified by Buffer and Length from the lowest\r | |
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 | |
30 | \r | |
31 | If Length > 0 and Buffer is NULL, then ASSERT().\r | |
32 | If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r | |
33 | \r | |
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 | |
37 | \r | |
38 | @return A pointer to the matching byte in the target buffer or NULL otherwise.\r | |
39 | \r | |
40 | **/\r | |
41 | VOID *\r | |
42 | EFIAPI\r | |
43 | ScanMem8 (\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 | |
52 | ASSERT (Buffer != NULL);\r | |
53 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r | |
54 | \r | |
55 | return (VOID*)InternalMemScanMem8 (Buffer, Length, Value);\r | |
56 | }\r | |
57 | \r | |
58 | /**\r | |
59 | Scans a target buffer for a UINTN sized value, and returns a pointer to the matching\r | |
60 | UINTN sized value in the target buffer.\r | |
61 | \r | |
62 | This function searches the target buffer specified by Buffer and Length from the lowest\r | |
63 | address to the highest address for a UINTN sized value that matches Value. If a match is found,\r | |
64 | then a pointer to the matching byte in the target buffer is returned. If no match is found,\r | |
65 | then NULL is returned. If Length is 0, then NULL is returned.\r | |
66 | \r | |
67 | If Length > 0 and Buffer is NULL, then ASSERT().\r | |
68 | If Buffer is not aligned on a UINTN boundary, then ASSERT().\r | |
69 | If Length is not aligned on a UINTN boundary, then ASSERT().\r | |
70 | If Length is greater than (MAX_ADDRESS - Buffer + 1), then ASSERT().\r | |
71 | \r | |
72 | @param Buffer The pointer to the target buffer to scan.\r | |
73 | @param Length The number of bytes in Buffer to scan.\r | |
74 | @param Value\r | |
75 | The value to search for in the target buffer.\r | |
76 | \r | |
77 | @return A pointer to the matching byte in the target buffer or NULL otherwise.\r | |
78 | \r | |
79 | **/\r | |
80 | VOID *\r | |
81 | EFIAPI\r | |
82 | ScanMemN (\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 | |
90 | } else {\r | |
91 | return ScanMem32 (Buffer, Length, (UINT32)Value);\r | |
92 | }\r | |
93 | }\r | |
94 | \r |