root / lab4 / .minix-src / include / net / gen / vjhc.h @ 14
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| 1 | 13 | up20180614 | /*
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| 2 | net/gen/vjhc.h
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| 3 | |||
| 4 | Defines for Van Jacobson TCP/IP Header Compression as defined in RFC-1144
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| 5 | |||
| 6 | Created: Nov 15, 1993 by Philip Homburg <philip@cs.vu.nl>
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| 7 | */
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| 8 | |||
| 9 | #ifndef __NET__GEN__VJHC_H__
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| 10 | #define __NET__GEN__VJHC_H__
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| 11 | |||
| 12 | #define VJHC_FLAG_U 0x01 |
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| 13 | #define VJHC_FLAG_W 0x02 |
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| 14 | #define VJHC_FLAG_A 0x04 |
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| 15 | #define VJHC_FLAG_S 0x08 |
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| 16 | #define VJHC_FLAG_P 0x10 |
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| 17 | #define VJHC_FLAG_I 0x20 |
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| 18 | #define VJHC_FLAG_C 0x40 |
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| 19 | |||
| 20 | #define VJHC_SPEC_I (VJHC_FLAG_S | VJHC_FLAG_W | VJHC_FLAG_U)
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| 21 | #define VJHC_SPEC_D (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
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| 22 | #define VJHC_SPEC_MASK (VJHC_FLAG_S | VJHC_FLAG_A | VJHC_FLAG_W | VJHC_FLAG_U)
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| 23 | |||
| 24 | #define VJHC_ENCODE(cp, n) \
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| 25 | { \
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| 26 | if ((u16_t)(n) >= 256) \ |
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| 27 | { \
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| 28 | *(cp)++= 0; \
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| 29 | *(cp)++= (n >> 8); \
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| 30 | *(cp)++= (n); \ |
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| 31 | } \ |
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| 32 | else \
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| 33 | *(cp)++= (n); \ |
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| 34 | } |
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| 35 | |||
| 36 | #define VJHC_ENCODEZ(cp, n) \
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| 37 | { \
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| 38 | if ((u16_t)(n) == 0 || (u16_t)(n) >= 256) \ |
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| 39 | { \
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| 40 | *(cp)++= 0; \
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| 41 | *(cp)++= (n >> 8); \
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| 42 | *(cp)++= (n); \ |
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| 43 | } \ |
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| 44 | else \
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| 45 | *(cp)++= (n); \ |
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| 46 | } |
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| 47 | |||
| 48 | #define VJHC_DECODEL(cp, l) \
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| 49 | { \
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| 50 | if (*(cp) == 0) \ |
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| 51 | { \
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| 52 | (l)= htonl(ntohl((l)) + (((cp)[1] << 8) | (cp)[2])); \ |
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| 53 | (cp) += 3; \
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| 54 | } \ |
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| 55 | else \
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| 56 | (l)= htonl(ntohl((l)) + (u32_t)*(cp)++); \ |
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| 57 | } |
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| 58 | |||
| 59 | #define VJHC_DECODES(cp, s) \
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| 60 | { \
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| 61 | if (*(cp) == 0) \ |
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| 62 | { \
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| 63 | (s)= htons(ntohs((s)) + (((cp)[1] << 8) | (cp)[2])); \ |
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| 64 | (cp) += 3; \
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| 65 | } \ |
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| 66 | else \
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| 67 | (s)= htons(ntohs((s)) + (u16_t)*(cp)++); \ |
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| 68 | } |
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| 69 | |||
| 70 | #define VJHC_DECODEU(cp, s) \
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| 71 | { \
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| 72 | if (*(cp) == 0) \ |
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| 73 | { \
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| 74 | (s)= htons(((cp)[1] << 8) | (cp)[2]); \ |
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| 75 | (cp) += 3; \
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| 76 | } \ |
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| 77 | else \
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| 78 | (s)= htons((u16_t)*(cp)++); \ |
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| 79 | } |
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| 80 | |||
| 81 | #endif /* __NET__GEN__VJHC_H__ */ |
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| 82 | |||
| 83 | /*
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| 84 | * $PchId: vjhc.h,v 1.2 1995/11/17 22:14:46 philip Exp $
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| 85 | */ |