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/* * 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) __P((u_char *options, int opt_len)); /* Free space used by a compressor */ void (*comp_free) __P((void *state)); /* Initialize a compressor */ int (*comp_init) __P((void *state, u_char *options, int opt_len, int unit, int hdrlen, int debug)); /* Reset a compressor */ void (*comp_reset) __P((void *state)); /* Compress a packet */ int (*compress) __P((void *state, PACKETPTR *mret, PACKETPTR mp, int orig_len, int max_len)); /* Return compression statistics */ void (*comp_stat) __P((void *state, struct compstat *stats)); /* Allocate space for a decompressor (receive side) */ void *(*decomp_alloc) __P((u_char *options, int opt_len)); /* Free space used by a decompressor */ void (*decomp_free) __P((void *state)); /* Initialize a decompressor */ int (*decomp_init) __P((void *state, u_char *options, int opt_len, int unit, int hdrlen, int mru, int debug)); /* Reset a decompressor */ void (*decomp_reset) __P((void *state)); /* Decompress a packet. */ int (*decompress) __P((void *state, PACKETPTR mp, PACKETPTR *dmpp)); /* Update state for an incompressible packet received */ void (*incomp) __P((void *state, PACKETPTR mp)); /* Return decompression statistics */ void (*decomp_stat) __P((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 /* _NET_PPP_COMP_H */
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