projects / mirror_edk2.git / blame
| Commit | Line | Data |
|---|---|---|
| 3eb9473e | 1 | /*++\r |
| 2 | \r | |
| 4ea9375a HT |
3 | Copyright (c) 2004, Intel Corporation. All rights reserved.<BR>\r |
| 4 | This program and the accompanying materials \r | |
| 3eb9473e | 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 |