3970ef2701
2.3.0 -> 2.3.1 changes, but I seem to recall that there are certain "issues" with 2.3.1 (I'm not sure if it's just pppd or the whole lot, I am not quite that far). The present pppd seems to work with it just fine for the time being. Among the changes are that zlib (aka LZ77 aka deflate aka gzip) compression is implemented as well as the original compress(1) LZW style.
165 lines
5.5 KiB
C
165 lines
5.5 KiB
C
/*
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* ppp_comp.h - Definitions for doing PPP packet compression.
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*
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* Copyright (c) 1994 The Australian National University.
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* All rights reserved.
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*
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* Permission to use, copy, modify, and distribute this software and its
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* documentation is hereby granted, provided that the above copyright
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* notice appears in all copies. This software is provided without any
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* warranty, express or implied. The Australian National University
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* makes no representations about the suitability of this software for
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* any purpose.
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*
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* IN NO EVENT SHALL THE AUSTRALIAN NATIONAL UNIVERSITY BE LIABLE TO ANY
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* PARTY FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF
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* THE AUSTRALIAN NATIONAL UNIVERSITY HAVE BEEN ADVISED OF THE POSSIBILITY
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* OF SUCH DAMAGE.
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*
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* THE AUSTRALIAN NATIONAL UNIVERSITY SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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* AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE AUSTRALIAN NATIONAL UNIVERSITY HAS NO
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* OBLIGATION TO PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS,
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* OR MODIFICATIONS.
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*
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* $Id: ppp_comp.h,v 1.4 1997/02/22 09:41:11 peter Exp $
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*/
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#ifndef _NET_PPP_COMP_H
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#define _NET_PPP_COMP_H
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/*
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* The following symbols control whether we include code for
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* various compression methods.
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*/
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#ifndef DO_BSD_COMPRESS
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#define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */
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#endif
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#ifndef DO_DEFLATE
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#define DO_DEFLATE 1 /* by default, include Deflate */
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#endif
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#define DO_PREDICTOR_1 0
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#define DO_PREDICTOR_2 0
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/*
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* Structure giving methods for compression/decompression.
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*/
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#ifdef PACKETPTR
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struct compressor {
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int compress_proto; /* CCP compression protocol number */
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/* Allocate space for a compressor (transmit side) */
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void *(*comp_alloc) __P((u_char *options, int opt_len));
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/* Free space used by a compressor */
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void (*comp_free) __P((void *state));
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/* Initialize a compressor */
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int (*comp_init) __P((void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int debug));
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/* Reset a compressor */
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void (*comp_reset) __P((void *state));
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/* Compress a packet */
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int (*compress) __P((void *state, PACKETPTR *mret,
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PACKETPTR mp, int orig_len, int max_len));
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/* Return compression statistics */
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void (*comp_stat) __P((void *state, struct compstat *stats));
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/* Allocate space for a decompressor (receive side) */
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void *(*decomp_alloc) __P((u_char *options, int opt_len));
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/* Free space used by a decompressor */
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void (*decomp_free) __P((void *state));
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/* Initialize a decompressor */
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int (*decomp_init) __P((void *state, u_char *options, int opt_len,
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int unit, int hdrlen, int mru, int debug));
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/* Reset a decompressor */
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void (*decomp_reset) __P((void *state));
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/* Decompress a packet. */
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int (*decompress) __P((void *state, PACKETPTR mp,
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PACKETPTR *dmpp));
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/* Update state for an incompressible packet received */
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void (*incomp) __P((void *state, PACKETPTR mp));
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/* Return decompression statistics */
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void (*decomp_stat) __P((void *state, struct compstat *stats));
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};
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#endif /* PACKETPTR */
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/*
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* Return values for decompress routine.
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* We need to make these distinctions so that we can disable certain
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* useful functionality, namely sending a CCP reset-request as a result
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* of an error detected after decompression. This is to avoid infringing
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* a patent held by Motorola.
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* Don't you just lurve software patents.
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*/
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#define DECOMP_OK 0 /* everything went OK */
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#define DECOMP_ERROR 1 /* error detected before decomp. */
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#define DECOMP_FATALERROR 2 /* error detected after decomp. */
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/*
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* CCP codes.
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*/
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#define CCP_CONFREQ 1
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#define CCP_CONFACK 2
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#define CCP_TERMREQ 5
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#define CCP_TERMACK 6
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#define CCP_RESETREQ 14
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#define CCP_RESETACK 15
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/*
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* Max # bytes for a CCP option
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*/
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#define CCP_MAX_OPTION_LENGTH 32
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/*
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* Parts of a CCP packet.
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*/
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#define CCP_CODE(dp) ((dp)[0])
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#define CCP_ID(dp) ((dp)[1])
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#define CCP_LENGTH(dp) (((dp)[2] << 8) + (dp)[3])
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#define CCP_HDRLEN 4
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#define CCP_OPT_CODE(dp) ((dp)[0])
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#define CCP_OPT_LENGTH(dp) ((dp)[1])
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#define CCP_OPT_MINLEN 2
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/*
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* Definitions for BSD-Compress.
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*/
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#define CI_BSD_COMPRESS 21 /* config. option for BSD-Compress */
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#define CILEN_BSD_COMPRESS 3 /* length of config. option */
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/* Macros for handling the 3rd byte of the BSD-Compress config option. */
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#define BSD_NBITS(x) ((x) & 0x1F) /* number of bits requested */
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#define BSD_VERSION(x) ((x) >> 5) /* version of option format */
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#define BSD_CURRENT_VERSION 1 /* current version number */
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#define BSD_MAKE_OPT(v, n) (((v) << 5) | (n))
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#define BSD_MIN_BITS 9 /* smallest code size supported */
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#define BSD_MAX_BITS 15 /* largest code size supported */
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/*
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* Definitions for Deflate.
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*/
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#define CI_DEFLATE 24 /* config option for Deflate */
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#define CILEN_DEFLATE 4 /* length of its config option */
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#define DEFLATE_MIN_SIZE 8
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#define DEFLATE_MAX_SIZE 15
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#define DEFLATE_METHOD_VAL 8
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#define DEFLATE_SIZE(x) (((x) >> 4) + DEFLATE_MIN_SIZE)
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#define DEFLATE_METHOD(x) ((x) & 0x0F)
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#define DEFLATE_MAKE_OPT(w) ((((w) - DEFLATE_MIN_SIZE) << 4) \
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+ DEFLATE_METHOD_VAL)
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#define DEFLATE_CHK_SEQUENCE 0
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/*
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* Definitions for other, as yet unsupported, compression methods.
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*/
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#define CI_PREDICTOR_1 1 /* config option for Predictor-1 */
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#define CILEN_PREDICTOR_1 2 /* length of its config option */
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#define CI_PREDICTOR_2 2 /* config option for Predictor-2 */
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#define CILEN_PREDICTOR_2 2 /* length of its config option */
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#endif /* _NET_PPP_COMP_H */
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