-/*
- * ppp-comp.h - Definitions for doing PPP packet compression.
- *
- * Copyright (c) 1994 Paul Mackerras. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The name(s) of the authors of this software must not be used to
- * endorse or promote products derived from this software without
- * prior written permission.
- *
- * 4. Redistributions of any form whatsoever must retain the following
- * acknowledgment:
- * "This product includes software developed by Paul Mackerras
- * <paulus@samba.org>".
- *
- * THE AUTHORS OF THIS SOFTWARE DISCLAIM ALL WARRANTIES WITH REGARD TO
- * THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
- * AND FITNESS, IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
- * SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
- * AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
- * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * $Id: ppp-comp.h,v 1.2 2002/12/06 09:49:16 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
-
-#if defined(SOL2)
-#include <net/ppp_defs.h>
-#else
-#include <linux/ppp_defs.h>
-#endif
-
-/*
- * Structure giving methods for compression/decompression.
- */
-struct compressor {
- int compress_proto; /* CCP compression protocol number */
-
- /* 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, u_char *mp, int inlen,
- u_char *dmp, int *outlen);
- /* Update state for an incompressible packet received */
- void (*incomp)(void *state, u_char *mp, int len);
- /* Return decompression statistics */
- void (*decomp_stat)(void *state, struct compstat *stats);
-};
-
-/*
- * 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_CONFNAK 3
-#define CCP_CONFREJ 4
-#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 26 /* config option for Deflate */
-#define CI_DEFLATE_DRAFT 24 /* value used in original draft RFC */
-#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 */
projects / ppp.git / blobdiff