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- /*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
- /*
- * 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.
- *
- */
-
- #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.
- */
- #if 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 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 */
-