51 lines
1.0 KiB
C
51 lines
1.0 KiB
C
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/* This includes some functions that were part of the net piece */
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/*
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** Copyright 2001, Travis Geiselbrecht. All rights reserved.
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** Distributed under the terms of the NewOS License.
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*/
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#include <ktypes.h>
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#include <debug.h>
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/* XXX - keep the compiler happy. */
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uint16 ones_sum16(uint32 sum, const void *_buf, int len);
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uint16 cksum16(void *_buf, int len);
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uint16 cksum16_2(void *buf1, int len1, void *buf2, int len2);
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uint16 ones_sum16(uint32 sum, const void *_buf, int len)
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{
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const uint16 *buf = _buf;
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while(len >= 2) {
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sum += *buf++;
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if(sum & 0x80000000)
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sum = (sum & 0xffff) + (sum >> 16);
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len -= 2;
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}
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if (len) {
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uint8 temp[2];
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temp[0] = *(uint8 *) buf;
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temp[1] = 0;
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sum += *(uint16 *) temp;
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}
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while(sum >> 16)
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sum = (sum & 0xffff) + (sum >> 16);
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return sum;
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}
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uint16 cksum16(void *_buf, int len)
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{
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return ~ones_sum16(0, _buf, len);
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}
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uint16 cksum16_2(void *buf1, int len1, void *buf2, int len2)
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{
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uint32 sum;
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sum = ones_sum16(0, buf1, len1);
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return ~ones_sum16(sum, buf2, len2);
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}
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