From 9fb3eefca02c03401d464f801905e8d705e232fa Mon Sep 17 00:00:00 2001
From: peter <peter@FreeBSD.org>
Date: Tue, 31 Oct 1995 20:07:32 +0000
Subject: Initial revision

---
 sys/net/ppp_comp.h | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 136 insertions(+)
 create mode 100644 sys/net/ppp_comp.h

(limited to 'sys/net/ppp_comp.h')

diff --git a/sys/net/ppp_comp.h b/sys/net/ppp_comp.h
new file mode 100644
index 0000000..e2579f8
--- /dev/null
+++ b/sys/net/ppp_comp.h
@@ -0,0 +1,136 @@
+/*
+ * 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 1.7 1995/05/01 01:43:37 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
+
+/*
+ * 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 */
+
+#endif /* _NET_PPP_COMP_H */
-- 
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