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