Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2003 VIA Networking, Inc. All rights reserved. |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation; either version 2 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | * |
| 18 | * |
| 19 | * File: tether.c |
| 20 | * |
| 21 | * Purpose: |
| 22 | * |
| 23 | * Author: Tevin Chen |
| 24 | * |
| 25 | * Date: May 21, 1996 |
| 26 | * |
| 27 | * Functions: |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 28 | * ETHbIsBufferCrc32Ok - Check CRC value of the buffer if Ok or not |
| 29 | * |
| 30 | * Revision History: |
| 31 | * |
| 32 | */ |
| 33 | |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 34 | #include "device.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 35 | #include "tmacro.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 36 | #include "tcrc.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 37 | #include "tether.h" |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 38 | |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 39 | /* |
| 40 | * Description: Check CRC value of the buffer if Ok or not |
| 41 | * |
| 42 | * Parameters: |
| 43 | * In: |
| 44 | * pbyBuffer - pointer of buffer (normally is rx buffer) |
| 45 | * cbFrameLength - length of buffer, including CRC portion |
| 46 | * Out: |
| 47 | * none |
| 48 | * |
Andres More | 4e9b5e2 | 2013-02-12 20:36:30 -0500 | [diff] [blame] | 49 | * Return Value: true if ok; false if error. |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 50 | * |
| 51 | */ |
Andres More | b902fbf | 2013-02-25 20:32:51 -0500 | [diff] [blame] | 52 | bool ETHbIsBufferCrc32Ok(u8 * pbyBuffer, unsigned int cbFrameLength) |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 53 | { |
Andres More | 52a7e64 | 2013-02-25 20:32:53 -0500 | [diff] [blame] | 54 | u32 dwCRC; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 55 | |
Daniel Kenji Toyama | b77694b | 2010-03-29 23:28:33 +1100 | [diff] [blame] | 56 | dwCRC = CRCdwGetCrc32(pbyBuffer, cbFrameLength - 4); |
Andres More | 52a7e64 | 2013-02-25 20:32:53 -0500 | [diff] [blame] | 57 | if (cpu_to_le32(*((u32 *)(pbyBuffer + cbFrameLength - 4))) != dwCRC) |
Andres More | e269fc2 | 2013-02-12 20:36:29 -0500 | [diff] [blame] | 58 | return false; |
Andres More | 4e9b5e2 | 2013-02-12 20:36:30 -0500 | [diff] [blame] | 59 | return true; |
Forest Bond | 92b9679 | 2009-06-13 07:38:31 -0400 | [diff] [blame] | 60 | } |
| 61 | |