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92b96797 FB |
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: | |
92b96797 FB |
28 | * ETHbIsBufferCrc32Ok - Check CRC value of the buffer if Ok or not |
29 | * | |
30 | * Revision History: | |
31 | * | |
32 | */ | |
33 | ||
92b96797 | 34 | #include "device.h" |
92b96797 | 35 | #include "tmacro.h" |
92b96797 | 36 | #include "tether.h" |
92b96797 | 37 | |
92b96797 FB |
38 | /* |
39 | * Description: Check CRC value of the buffer if Ok or not | |
40 | * | |
41 | * Parameters: | |
42 | * In: | |
43 | * pbyBuffer - pointer of buffer (normally is rx buffer) | |
44 | * cbFrameLength - length of buffer, including CRC portion | |
45 | * Out: | |
46 | * none | |
47 | * | |
4e9b5e2b | 48 | * Return Value: true if ok; false if error. |
92b96797 FB |
49 | * |
50 | */ | |
b902fbfe | 51 | bool ETHbIsBufferCrc32Ok(u8 * pbyBuffer, unsigned int cbFrameLength) |
92b96797 | 52 | { |
a06978bc | 53 | u32 n_crc = ~ether_crc_le(cbFrameLength - 4, pbyBuffer); |
92b96797 | 54 | |
a06978bc | 55 | if (le32_to_cpu(*((__le32 *)(pbyBuffer + cbFrameLength - 4))) != n_crc) |
e269fc2d | 56 | return false; |
a06978bc | 57 | |
4e9b5e2b | 58 | return true; |
92b96797 FB |
59 | } |
60 |