root / lab4 / .minix-src / include / net / gen / vjhc.h @ 13
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/*
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net/gen/vjhc.h
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Defines for Van Jacobson TCP/IP Header Compression as defined in RFC-1144
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Created: Nov 15, 1993 by Philip Homburg <philip@cs.vu.nl>
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*/
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#ifndef __NET__GEN__VJHC_H__
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#define __NET__GEN__VJHC_H__
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#define VJHC_FLAG_U 0x01 |
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#define VJHC_FLAG_W 0x02 |
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#define VJHC_FLAG_A 0x04 |
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#define VJHC_FLAG_S 0x08 |
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#define VJHC_FLAG_P 0x10 |
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#define VJHC_FLAG_I 0x20 |
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#define VJHC_FLAG_C 0x40 |
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#define VJHC_SPEC_I (VJHC_FLAG_S | VJHC_FLAG_W | VJHC_FLAG_U)
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#define VJHC_SPEC_D (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
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#define VJHC_SPEC_MASK (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
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#define VJHC_ENCODE(cp, n) \
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{ \
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if ((u16_t)(n) >= 256) \ |
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{ \
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*(cp)++= 0; \
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*(cp)++= (n >> 8); \
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*(cp)++= (n); \ |
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} \ |
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else \
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*(cp)++= (n); \ |
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} |
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#define VJHC_ENCODEZ(cp, n) \
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{ \
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if ((u16_t)(n) == 0 || (u16_t)(n) >= 256) \ |
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{ \
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*(cp)++= 0; \
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*(cp)++= (n >> 8); \
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*(cp)++= (n); \ |
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} \ |
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else \
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*(cp)++= (n); \ |
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} |
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#define VJHC_DECODEL(cp, l) \
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{ \
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if (*(cp) == 0) \ |
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{ \
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(l)= htonl(ntohl((l)) + (((cp)[1] << 8) | (cp)[2])); \ |
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(cp) += 3; \
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} \ |
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else \
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(l)= htonl(ntohl((l)) + (u32_t)*(cp)++); \ |
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} |
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#define VJHC_DECODES(cp, s) \
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{ \
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if (*(cp) == 0) \ |
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{ \
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(s)= htons(ntohs((s)) + (((cp)[1] << 8) | (cp)[2])); \ |
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(cp) += 3; \
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} \ |
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else \
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(s)= htons(ntohs((s)) + (u16_t)*(cp)++); \ |
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} |
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#define VJHC_DECODEU(cp, s) \
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{ \
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if (*(cp) == 0) \ |
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{ \
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(s)= htons(((cp)[1] << 8) | (cp)[2]); \ |
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(cp) += 3; \
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} \ |
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else \
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(s)= htons((u16_t)*(cp)++); \ |
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} |
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#endif /* __NET__GEN__VJHC_H__ */ |
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/*
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* $PchId: vjhc.h,v 1.2 1995/11/17 22:14:46 philip Exp $
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*/
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