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3eb9473e | 1 | /*++\r |
2 | \r | |
3 | Copyright (c) 2004, Intel Corporation \r | |
4 | All rights reserved. This program and the accompanying materials \r | |
5 | are licensed and made available under the terms and conditions of the BSD License \r | |
6 | which accompanies this distribution. The full text of the license may be found at \r | |
7 | http://opensource.org/licenses/bsd-license.php \r | |
8 | \r | |
9 | THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r | |
10 | WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r | |
11 | \r | |
12 | Module Name:\r | |
13 | \r | |
14 | EfiCompareMem.c\r | |
15 | \r | |
16 | Abstract:\r | |
17 | \r | |
18 | Generic compare-memory routine. \r | |
19 | \r | |
20 | --*/\r | |
21 | \r | |
22 | #include "Tiano.h"\r | |
23 | #include "EfiDriverLib.h"\r | |
24 | \r | |
25 | \r | |
26 | INTN\r | |
27 | EfiCompareMem (\r | |
28 | IN VOID *MemOne,\r | |
29 | IN VOID *MemTwo,\r | |
30 | IN UINTN Length\r | |
31 | )\r | |
32 | /*++\r | |
33 | \r | |
34 | Routine Description:\r | |
35 | \r | |
36 | Compares two memory buffers of a given length.\r | |
37 | \r | |
38 | Arguments:\r | |
39 | \r | |
40 | MemOne - First memory buffer\r | |
41 | \r | |
42 | MemTwo - Second memory buffer\r | |
43 | \r | |
44 | Len - Length of Mem1 and Mem2 memory regions to compare\r | |
45 | \r | |
46 | Returns:\r | |
47 | \r | |
48 | = 0 if MemOne == MemTwo\r | |
49 | \r | |
50 | --*/\r | |
51 | {\r | |
52 | INTN ReturnValue;\r | |
53 | \r | |
54 | if (!(EFI_UINTN_ALIGNED (MemOne) || EFI_UINTN_ALIGNED (MemTwo) || EFI_UINTN_ALIGNED (Length))) {\r | |
55 | //\r | |
56 | // If Destination/Source/Length are aligned do UINTN conpare\r | |
57 | //\r | |
58 | for (; Length > 0; Length -= sizeof (INTN), MemOne = (VOID *)((UINTN)MemOne + sizeof (INTN)), MemTwo = (VOID *)((UINTN)MemTwo + sizeof (INTN))) {\r | |
59 | if (*(INTN *)MemOne != *(INTN *)MemTwo) {\r | |
60 | break;\r | |
61 | }\r | |
62 | }\r | |
63 | }\r | |
64 | \r | |
65 | //\r | |
66 | // If Destination/Source/Length not aligned do byte compare\r | |
67 | //\r | |
68 | for (; Length > 0; Length--, MemOne = (VOID *)((UINTN)MemOne + 1), MemTwo = (VOID *)((UINTN)MemTwo + 1)) {\r | |
69 | ReturnValue = (INTN)(*(INT8 *)MemOne - *(INT8 *)MemTwo);\r | |
70 | if (ReturnValue != 0) {\r | |
71 | return ReturnValue;\r | |
72 | }\r | |
73 | }\r | |
74 | \r | |
75 | return 0;\r | |
76 | }\r |