| 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 |