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50 lines
1.2 KiB
C
50 lines
1.2 KiB
C
/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (C) 1994, 1995 Waldorf Electronics GmbH
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* Copyright (C) 1998, 1999 Ralf Baechle
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include <asm/string.h>
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#include <asm/uaccess.h>
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#include <net/checksum.h>
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/*
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* copy while checksumming, otherwise like csum_partial
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*/
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unsigned int csum_partial_copy_nocheck(const unsigned char *src,
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unsigned char *dst, int len, unsigned int sum)
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{
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/*
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* It's 2:30 am and I don't feel like doing it real ...
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* This is lots slower than the real thing (tm)
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*/
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sum = csum_partial(src, len, sum);
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memcpy(dst, src, len);
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return sum;
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}
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/*
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* Copy from userspace and compute checksum. If we catch an exception
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* then zero the rest of the buffer.
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*/
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unsigned int csum_partial_copy_from_user (const unsigned char __user *src,
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unsigned char *dst, int len, unsigned int sum, int *err_ptr)
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{
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int missing;
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might_sleep();
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missing = copy_from_user(dst, src, len);
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if (missing) {
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memset(dst + len - missing, 0, missing);
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*err_ptr = -EFAULT;
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}
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return csum_partial(dst, len, sum);
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}
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