2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (C) 1994, 1995 Waldorf Electronics GmbH
7 * Copyright (C) 1998, 1999 Ralf Baechle
9 #include <net/checksum.h>
10 #include <linux/types.h>
11 #include <asm/byteorder.h>
12 #include <asm/string.h>
13 #include <asm/uaccess.h>
16 * copy while checksumming, otherwise like csum_partial
18 unsigned int csum_partial_copy_nocheck(const char *src
, char *dst
,
19 int len
, unsigned int sum
)
22 * It's 2:30 am and I don't feel like doing it real ...
23 * This is lots slower than the real thing (tm)
25 sum
= csum_partial(src
, len
, sum
);
26 memcpy(dst
, src
, len
);
32 * Copy from userspace and compute checksum. If we catch an exception
33 * then zero the rest of the buffer.
35 unsigned int csum_partial_copy_from_user (const char *src
, char *dst
,
36 int len
, unsigned int sum
, int *err_ptr
)
40 missing
= copy_from_user(dst
, src
, len
);
42 memset(dst
+ len
- missing
, 0, missing
);
46 return csum_partial(dst
, len
, sum
);