The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/net/mppc.h

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    1 /*-
    2  * Copyright (c) 2007 Alexander Motin <mav@freebsd.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice unmodified, this list of conditions, and the following
   10  *    disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/12.0/sys/net/mppc.h 301549 2016-06-07 15:07:00Z pfg $
   28  */
   29 
   30 /*
   31  * MPPC decompression library.
   32  * Version 1.0
   33  *
   34  * Note that Hi/Fn (later acquired by Exar Corporation) held US patents
   35  * on some implementation-critical aspects of MPPC compression.
   36  * These patents lapsed due to non-payment of fees in 2007 and by 2015
   37  * expired altogether.
   38  */
   39 
   40 #ifndef _NET_MPPC_H_
   41 #define _NET_MPPC_H_
   42 
   43 #define MPPC_MANDATORY_COMPRESS_FLAGS 0
   44 #define MPPC_MANDATORY_DECOMPRESS_FLAGS 0
   45 
   46 #define MPPC_SAVE_HISTORY 1
   47 
   48 #define MPPC_OK 5
   49 #define MPPC_EXPANDED 8
   50 #define MPPC_RESTART_HISTORY 16
   51 #define MPPC_DEST_EXHAUSTED 32
   52 
   53 extern size_t MPPC_SizeOfCompressionHistory(void);
   54 extern size_t MPPC_SizeOfDecompressionHistory(void);
   55 
   56 extern void MPPC_InitCompressionHistory(char *history);
   57 extern void MPPC_InitDecompressionHistory(char *history);
   58 
   59 extern int MPPC_Compress(u_char **src, u_char **dst, u_long *srcCnt, u_long *dstCnt, char *history, int flags, int undef);
   60 extern int MPPC_Decompress(u_char **src, u_char **dst, u_long *srcCnt, u_long *dstCnt, char *history, int flags);
   61 
   62 #endif

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