0,0 → 1,180 |
/*!\file net/ppp-comp.h |
* PPP compression. |
*/ |
|
/* $NetBSD: ppp-comp.h,v 1.3 1997/03/12 20:26:55 christos Exp $ */ |
|
/* |
* ppp-comp.h - Definitions for doing PPP packet compression. |
* |
* Copyright (c) 1994 The Australian National University. |
* All rights reserved. |
* |
* Permission to use, copy, modify, and distribute this software and its |
* documentation is hereby granted, provided that the above copyright |
* notice appears in all copies. This software is provided without any |
* warranty, express or implied. The Australian National University |
* makes no representations about the suitability of this software for |
* any purpose. |
* |
* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY |
* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF |
* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY |
* OF SUCH DAMAGE. |
* |
* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES, |
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO |
* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, |
* OR MODIFICATIONS. |
* |
* Id: ppp-comp.h,v 1.10 1996/09/26 06:30:11 paulus Exp |
*/ |
|
#ifndef __NET_PPP_COMP_H |
#define __NET_PPP_COMP_H |
|
/* |
* The following symbols control whether we include code for |
* various compression methods. |
*/ |
#ifndef DO_BSD_COMPRESS |
#define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */ |
#endif |
|
#ifndef DO_DEFLATE |
#define DO_DEFLATE 1 /* by default, include Deflate */ |
#endif |
|
#define DO_PREDICTOR_1 0 |
#define DO_PREDICTOR_2 0 |
|
/* |
* Structure giving methods for compression/decompression. |
*/ |
#ifdef PACKETPTR |
struct compressor { |
int compress_proto; /* CCP compression protocol number */ |
|
/* Allocate space for a compressor (transmit side) */ |
void *(*comp_alloc) (u_char *options, int opt_len); |
|
/* Free space used by a compressor */ |
void (*comp_free) (void *state); |
|
/* Initialize a compressor */ |
int (*comp_init) (void *state, u_char *options, int opt_len, |
int unit, int hdrlen, int debug); |
/* Reset a compressor */ |
void (*comp_reset) (void *state); |
|
/* Compress a packet */ |
int (*compress) (void *state, PACKETPTR *mret, |
PACKETPTR mp, int orig_len, int max_len); |
|
/* Return compression statistics */ |
void (*comp_stat) (void *state, struct compstat *stats); |
|
/* Allocate space for a decompressor (receive side) */ |
void *(*decomp_alloc) (u_char *options, int opt_len); |
|
/* Free space used by a decompressor */ |
void (*decomp_free) (void *state); |
|
/* Initialize a decompressor */ |
int (*decomp_init) (void *state, u_char *options, int opt_len, |
int unit, int hdrlen, int mru, int debug); |
/* Reset a decompressor */ |
void (*decomp_reset) (void *state); |
|
/* Decompress a packet. */ |
int (*decompress) (void *state, PACKETPTR mp, PACKETPTR *dmpp); |
|
/* Update state for an incompressible packet received */ |
void (*incomp) (void *state, PACKETPTR mp); |
|
/* Return decompression statistics */ |
void (*decomp_stat) (void *state, struct compstat *stats); |
}; |
#endif /* PACKETPTR */ |
|
/* |
* Return values for decompress routine. |
* We need to make these distinctions so that we can disable certain |
* useful functionality, namely sending a CCP reset-request as a result |
* of an error detected after decompression. This is to avoid infringing |
* a patent held by Motorola. |
* Don't you just lurve software patents. |
*/ |
#define DECOMP_OK 0 /* everything went OK */ |
#define DECOMP_ERROR 1 /* error detected before decomp. */ |
#define DECOMP_FATALERROR 2 /* error detected after decomp. */ |
|
/* |
* CCP codes. |
*/ |
#define CCP_CONFREQ 1 |
#define CCP_CONFACK 2 |
#define CCP_TERMREQ 5 |
#define CCP_TERMACK 6 |
#define CCP_RESETREQ 14 |
#define CCP_RESETACK 15 |
|
/* |
* Max # bytes for a CCP option |
*/ |
#define CCP_MAX_OPTION_LENGTH 32 |
|
/* |
* Parts of a CCP packet. |
*/ |
#define CCP_CODE(dp) ((dp)[0]) |
#define CCP_ID(dp) ((dp)[1]) |
#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3]) |
#define CCP_HDRLEN 4 |
|
#define CCP_OPT_CODE(dp) ((dp)[0]) |
#define CCP_OPT_LENGTH(dp) ((dp)[1]) |
#define CCP_OPT_MINLEN 2 |
|
/* |
* Definitions for BSD-Compress. |
*/ |
#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */ |
#define CILEN_BSD_COMPRESS 3 /* length of config. option */ |
|
/* Macros for handling the 3rd byte of the BSD-Compress config option. */ |
#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */ |
#define BSD_VERSION(x) ((x) >> 5) /* version of option format */ |
#define BSD_CURRENT_VERSION 1 /* current version number */ |
#define BSD_MAKE_OPT(v, n) (((v) << 5) | (n)) |
|
#define BSD_MIN_BITS 9 /* smallest code size supported */ |
#define BSD_MAX_BITS 15 /* largest code size supported */ |
|
/* |
* Definitions for Deflate. |
*/ |
#define CI_DEFLATE 24 /* config option for Deflate */ |
#define CILEN_DEFLATE 4 /* length of its config option */ |
|
#define DEFLATE_MIN_SIZE 8 |
#define DEFLATE_MAX_SIZE 15 |
#define DEFLATE_METHOD_VAL 8 |
#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE) |
#define DEFLATE_METHOD(x) ((x) & 0x0F) |
#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \ |
+ DEFLATE_METHOD_VAL) |
#define DEFLATE_CHK_SEQUENCE 0 |
|
/* |
* Definitions for other, as yet unsupported, compression methods. |
*/ |
#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */ |
#define CILEN_PREDICTOR_1 2 /* length of its config option */ |
#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */ |
#define CILEN_PREDICTOR_2 2 /* length of its config option */ |
|
#endif |