root / lab4 / .minix-src / include / net / gen / vjhc.h @ 14
History | View | Annotate | Download (1.55 KB)
| 1 |
/*
|
|---|---|
| 2 |
net/gen/vjhc.h
|
| 3 |
|
| 4 |
Defines for Van Jacobson TCP/IP Header Compression as defined in RFC-1144
|
| 5 |
|
| 6 |
Created: Nov 15, 1993 by Philip Homburg <philip@cs.vu.nl>
|
| 7 |
*/
|
| 8 |
|
| 9 |
#ifndef __NET__GEN__VJHC_H__
|
| 10 |
#define __NET__GEN__VJHC_H__
|
| 11 |
|
| 12 |
#define VJHC_FLAG_U 0x01 |
| 13 |
#define VJHC_FLAG_W 0x02 |
| 14 |
#define VJHC_FLAG_A 0x04 |
| 15 |
#define VJHC_FLAG_S 0x08 |
| 16 |
#define VJHC_FLAG_P 0x10 |
| 17 |
#define VJHC_FLAG_I 0x20 |
| 18 |
#define VJHC_FLAG_C 0x40 |
| 19 |
|
| 20 |
#define VJHC_SPEC_I (VJHC_FLAG_S | VJHC_FLAG_W | VJHC_FLAG_U)
|
| 21 |
#define VJHC_SPEC_D (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
|
| 22 |
#define VJHC_SPEC_MASK (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
|
| 23 |
|
| 24 |
#define VJHC_ENCODE(cp, n) \
|
| 25 |
{ \
|
| 26 |
if ((u16_t)(n) >= 256) \ |
| 27 |
{ \
|
| 28 |
*(cp)++= 0; \
|
| 29 |
*(cp)++= (n >> 8); \
|
| 30 |
*(cp)++= (n); \ |
| 31 |
} \ |
| 32 |
else \
|
| 33 |
*(cp)++= (n); \ |
| 34 |
} |
| 35 |
|
| 36 |
#define VJHC_ENCODEZ(cp, n) \
|
| 37 |
{ \
|
| 38 |
if ((u16_t)(n) == 0 || (u16_t)(n) >= 256) \ |
| 39 |
{ \
|
| 40 |
*(cp)++= 0; \
|
| 41 |
*(cp)++= (n >> 8); \
|
| 42 |
*(cp)++= (n); \ |
| 43 |
} \ |
| 44 |
else \
|
| 45 |
*(cp)++= (n); \ |
| 46 |
} |
| 47 |
|
| 48 |
#define VJHC_DECODEL(cp, l) \
|
| 49 |
{ \
|
| 50 |
if (*(cp) == 0) \ |
| 51 |
{ \
|
| 52 |
(l)= htonl(ntohl((l)) + (((cp)[1] << 8) | (cp)[2])); \ |
| 53 |
(cp) += 3; \
|
| 54 |
} \ |
| 55 |
else \
|
| 56 |
(l)= htonl(ntohl((l)) + (u32_t)*(cp)++); \ |
| 57 |
} |
| 58 |
|
| 59 |
#define VJHC_DECODES(cp, s) \
|
| 60 |
{ \
|
| 61 |
if (*(cp) == 0) \ |
| 62 |
{ \
|
| 63 |
(s)= htons(ntohs((s)) + (((cp)[1] << 8) | (cp)[2])); \ |
| 64 |
(cp) += 3; \
|
| 65 |
} \ |
| 66 |
else \
|
| 67 |
(s)= htons(ntohs((s)) + (u16_t)*(cp)++); \ |
| 68 |
} |
| 69 |
|
| 70 |
#define VJHC_DECODEU(cp, s) \
|
| 71 |
{ \
|
| 72 |
if (*(cp) == 0) \ |
| 73 |
{ \
|
| 74 |
(s)= htons(((cp)[1] << 8) | (cp)[2]); \ |
| 75 |
(cp) += 3; \
|
| 76 |
} \ |
| 77 |
else \
|
| 78 |
(s)= htons((u16_t)*(cp)++); \ |
| 79 |
} |
| 80 |
|
| 81 |
#endif /* __NET__GEN__VJHC_H__ */ |
| 82 |
|
| 83 |
/*
|
| 84 |
* $PchId: vjhc.h,v 1.2 1995/11/17 22:14:46 philip Exp $
|
| 85 |
*/
|