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1 | /* |
2 | * ppp-comp.h - Definitions for doing PPP packet compression. |
3 | * |
4 | * Copyright 1994-1998 Paul Mackerras. |
5 | * |
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. |
9 | */ |
10 | #ifndef _NET_PPP_COMP_H |
11 | #define _NET_PPP_COMP_H |
12 | |
13 | #include <uapi/linux/ppp-comp.h> |
14 | |
15 | |
16 | struct module; |
17 | |
18 | /* |
19 | * The following symbols control whether we include code for |
20 | * various compression methods. |
21 | */ |
22 | |
23 | #ifndef DO_BSD_COMPRESS |
24 | #define DO_BSD_COMPRESS 1 /* by default, include BSD-Compress */ |
25 | #endif |
26 | #ifndef DO_DEFLATE |
27 | #define DO_DEFLATE 1 /* by default, include Deflate */ |
28 | #endif |
29 | #define DO_PREDICTOR_1 0 |
30 | #define DO_PREDICTOR_2 0 |
31 | |
32 | /* |
33 | * Structure giving methods for compression/decompression. |
34 | */ |
35 | |
36 | struct compressor { |
37 | int compress_proto; /* CCP compression protocol number */ |
38 | |
39 | /* Allocate space for a compressor (transmit side) */ |
40 | void *(*comp_alloc) (unsigned char *options, int opt_len); |
41 | |
42 | /* Free space used by a compressor */ |
43 | void (*comp_free) (void *state); |
44 | |
45 | /* Initialize a compressor */ |
46 | int (*comp_init) (void *state, unsigned char *options, |
47 | int opt_len, int unit, int opthdr, int debug); |
48 | |
49 | /* Reset a compressor */ |
50 | void (*comp_reset) (void *state); |
51 | |
52 | /* Compress a packet */ |
53 | int (*compress) (void *state, unsigned char *rptr, |
54 | unsigned char *obuf, int isize, int osize); |
55 | |
56 | /* Return compression statistics */ |
57 | void (*comp_stat) (void *state, struct compstat *stats); |
58 | |
59 | /* Allocate space for a decompressor (receive side) */ |
60 | void *(*decomp_alloc) (unsigned char *options, int opt_len); |
61 | |
62 | /* Free space used by a decompressor */ |
63 | void (*decomp_free) (void *state); |
64 | |
65 | /* Initialize a decompressor */ |
66 | int (*decomp_init) (void *state, unsigned char *options, |
67 | int opt_len, int unit, int opthdr, int mru, |
68 | int debug); |
69 | |
70 | /* Reset a decompressor */ |
71 | void (*decomp_reset) (void *state); |
72 | |
73 | /* Decompress a packet. */ |
74 | int (*decompress) (void *state, unsigned char *ibuf, int isize, |
75 | unsigned char *obuf, int osize); |
76 | |
77 | /* Update state for an incompressible packet received */ |
78 | void (*incomp) (void *state, unsigned char *ibuf, int icnt); |
79 | |
80 | /* Return decompression statistics */ |
81 | void (*decomp_stat) (void *state, struct compstat *stats); |
82 | |
83 | /* Used in locking compressor modules */ |
84 | struct module *owner; |
85 | /* Extra skb space needed by the compressor algorithm */ |
86 | unsigned int comp_extra; |
87 | }; |
88 | |
89 | /* |
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. |
93 | * |
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. |
99 | */ |
100 | |
101 | #define DECOMP_ERROR -1 /* error detected before decomp. */ |
102 | #define DECOMP_FATALERROR -2 /* error detected after decomp. */ |
103 | |
104 | extern int ppp_register_compressor(struct compressor *); |
105 | extern void ppp_unregister_compressor(struct compressor *); |
106 | #endif /* _NET_PPP_COMP_H */ |
107 |
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