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/* SPDX-License-Identifier: GPL-2.0-only */ /* * ppp-comp.h - Definitions for doing PPP packet compression. * * Copyright 1994-1998 Paul Mackerras. */ #ifndef _NET_PPP_COMP_H #define _NET_PPP_COMP_H #include struct module; /* * 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. */ struct compressor { int compress_proto; /* CCP compression protocol number */ /* Allocate space for a compressor (transmit side) */ void *(*comp_alloc) (unsigned char *options, int opt_len); /* Free space used by a compressor */ void (*comp_free) (void *state); /* Initialize a compressor */ int (*comp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int debug); /* Reset a compressor */ void (*comp_reset) (void *state); /* Compress a packet */ int (*compress) (void *state, unsigned char *rptr, unsigned char *obuf, int isize, int osize); /* Return compression statistics */ void (*comp_stat) (void *state, struct compstat *stats); /* Allocate space for a decompressor (receive side) */ void *(*decomp_alloc) (unsigned char *options, int opt_len); /* Free space used by a decompressor */ void (*decomp_free) (void *state); /* Initialize a decompressor */ int (*decomp_init) (void *state, unsigned char *options, int opt_len, int unit, int opthdr, int mru, int debug); /* Reset a decompressor */ void (*decomp_reset) (void *state); /* Decompress a packet. */ int (*decompress) (void *state, unsigned char *ibuf, int isize, unsigned char *obuf, int osize); /* Update state for an incompressible packet received */ void (*incomp) (void *state, unsigned char *ibuf, int icnt); /* Return decompression statistics */ void (*decomp_stat) (void *state, struct compstat *stats); /* Used in locking compressor modules */ struct module *owner; /* Extra skb space needed by the compressor algorithm */ unsigned int comp_extra; }; /* * The return value from decompress routine is the length of the * decompressed packet if successful, otherwise DECOMP_ERROR * or DECOMP_FATALERROR if an error occurred. * * We need to make this distinction 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 pa