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1 | /** @file\r |
2 | ScanMem16() implementation.\r |
3 | \r |
4 | Copyright (c) 2006, Intel Corporation<BR>\r |
5 | All rights reserved. This program and the accompanying materials\r |
6 | are licensed and made available under the terms and conditions of the BSD License\r |
7 | which accompanies this distribution. The full text of the license may be found at\r |
8 | http://opensource.org/licenses/bsd-license.php\r |
9 | \r |
10 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,\r |
11 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r |
12 | \r |
13 | Module Name: ScanMem16Wrapper.c\r |
14 | \r |
15 | The following BaseMemoryLib instances share the same version of this file:\r |
16 | \r |
17 | BaseMemoryLib\r |
18 | BaseMemoryLibMmx\r |
19 | BaseMemoryLibSse2\r |
20 | BaseMemoryLibRepStr\r |
21 | PeiMemoryLib\r |
22 | DxeMemoryLib\r |
23 | \r |
24 | **/\r |
25 | \r |
26 | //\r |
27 | // Include common header file for this module.\r |
28 | //\r |
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29 | \r |
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30 | \r |
31 | #include "MemLibInternals.h"\r |
32 | \r |
33 | /**\r |
34 | Scans a target buffer for a 16-bit value, and returns a pointer to the matching 16-bit value\r |
35 | in the target buffer.\r |
36 | \r |
37 | This function searches target the buffer specified by Buffer and Length from the lowest\r |
38 | address to the highest address for a 16-bit value that matches Value. If a match is found,\r |
39 | then a pointer to the matching byte in the target buffer is returned. If no match is found,\r |
40 | then NULL is returned. If Length is 0, then NULL is returned.\r |
41 | If Length > 0 and Buffer is NULL, then ASSERT().\r |
42 | If Buffer is not aligned on a 16-bit boundary, then ASSERT().\r |
43 | If Length is not aligned on a 16-bit boundary, then ASSERT().\r |
44 | If Length is greater than (MAX_ADDRESS ? Buffer + 1), then ASSERT(). \r |
45 | \r |
46 | @param Buffer Pointer to the target buffer to scan.\r |
47 | @param Length Number of bytes in Buffer to scan.\r |
48 | @param Value Value to search for in the target buffer.\r |
49 | \r |
50 | @return A pointer to the matching byte in the target buffer or NULL otherwise.\r |
51 | \r |
52 | **/\r |
53 | VOID *\r |
54 | EFIAPI\r |
55 | ScanMem16 (\r |
56 | IN CONST VOID *Buffer,\r |
57 | IN UINTN Length,\r |
58 | IN UINT16 Value\r |
59 | )\r |
60 | {\r |
61 | if (Length == 0) {\r |
62 | return NULL;\r |
63 | }\r |
64 | \r |
65 | ASSERT (Buffer != NULL);\r |
66 | ASSERT (((UINTN)Buffer & (sizeof (Value) - 1)) == 0);\r |
67 | ASSERT ((Length - 1) <= (MAX_ADDRESS - (UINTN)Buffer));\r |
68 | ASSERT ((Length & (sizeof (Value) - 1)) == 0);\r |
69 | \r |
70 | return (VOID*)InternalMemScanMem16 (Buffer, Length / sizeof (Value), Value);\r |
71 | }\r |