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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/ppp-comp.h
2 * ppp-comp.h - Definitions for doing PPP packet compression.
4 * Copyright 1994-1998 Paul Mackerras.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
10 #ifndef _NET_PPP_COMP_H
11 #define _NET_PPP_COMP_H
13 #include <uapi/linux/ppp-comp.h>
19 * The following symbols control whether we include code for
20 * various compression methods.
23 #ifndef DO_BSD_COMPRESS
24 #define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */
27 #define DO_DEFLATE 1 /* by default, include Deflate */
29 #define DO_PREDICTOR_1 0
30 #define DO_PREDICTOR_2 0
33 * Structure giving methods for compression/decompression.
37 int compress_proto
; /* CCP compression protocol number */
39 /* Allocate space for a compressor (transmit side) */
40 void *(*comp_alloc
) (unsigned char *options
, int opt_len
);
42 /* Free space used by a compressor */
43 void (*comp_free
) (void *state
);
45 /* Initialize a compressor */
46 int (*comp_init
) (void *state
, unsigned char *options
,
47 int opt_len
, int unit
, int opthdr
, int debug
);
49 /* Reset a compressor */
50 void (*comp_reset
) (void *state
);
52 /* Compress a packet */
53 int (*compress
) (void *state
, unsigned char *rptr
,
54 unsigned char *obuf
, int isize
, int osize
);
56 /* Return compression statistics */
57 void (*comp_stat
) (void *state
, struct compstat
*stats
);
59 /* Allocate space for a decompressor (receive side) */
60 void *(*decomp_alloc
) (unsigned char *options
, int opt_len
);
62 /* Free space used by a decompressor */
63 void (*decomp_free
) (void *state
);
65 /* Initialize a decompressor */
66 int (*decomp_init
) (void *state
, unsigned char *options
,
67 int opt_len
, int unit
, int opthdr
, int mru
,
70 /* Reset a decompressor */
71 void (*decomp_reset
) (void *state
);
73 /* Decompress a packet. */
74 int (*decompress
) (void *state
, unsigned char *ibuf
, int isize
,
75 unsigned char *obuf
, int osize
);
77 /* Update state for an incompressible packet received */
78 void (*incomp
) (void *state
, unsigned char *ibuf
, int icnt
);
80 /* Return decompression statistics */
81 void (*decomp_stat
) (void *state
, struct compstat
*stats
);
83 /* Used in locking compressor modules */
85 /* Extra skb space needed by the compressor algorithm */
86 unsigned int comp_extra
;
90 * The return value from decompress routine is the length of the
91 * decompressed packet if successful, otherwise DECOMP_ERROR
92 * or DECOMP_FATALERROR if an error occurred.
94 * We need to make this distinction so that we can disable certain
95 * useful functionality, namely sending a CCP reset-request as a result
96 * of an error detected after decompression. This is to avoid infringing
97 * a patent held by Motorola.
98 * Don't you just lurve software patents.
101 #define DECOMP_ERROR -1 /* error detected before decomp. */
102 #define DECOMP_FATALERROR -2 /* error detected after decomp. */
104 extern int ppp_register_compressor(struct compressor
*);
105 extern void ppp_unregister_compressor(struct compressor
*);
106 #endif /* _NET_PPP_COMP_H */