mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-16 09:13:55 +08:00
607ca46e97
Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
|
|
* ppp-comp.h - Definitions for doing PPP packet compression.
|
|
*
|
|
* Copyright 1994-1998 Paul Mackerras.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation.
|
|
*/
|
|
#ifndef _NET_PPP_COMP_H
|
|
#define _NET_PPP_COMP_H
|
|
|
|
#include <uapi/linux/ppp-comp.h>
|
|
|
|
|
|
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 patent held by Motorola.
|
|
* Don't you just lurve software patents.
|
|
*/
|
|
|
|
#define DECOMP_ERROR -1 /* error detected before decomp. */
|
|
#define DECOMP_FATALERROR -2 /* error detected after decomp. */
|
|
|
|
extern int ppp_register_compressor(struct compressor *);
|
|
extern void ppp_unregister_compressor(struct compressor *);
|
|
#endif /* _NET_PPP_COMP_H */
|