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c3fb425204
Support for compression has been available from July 2007 but it was never imported due to concerns with patents once held by STAC/HiFn. The issues have clearly been resolved so bring it in now. Special thanks to Brett Glass for preserving the code and pointing documentation for the expiration case. Obtained from: mav (through Brett Glass) Relnotes: yes MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D6739
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
/*-
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* Copyright (c) 2007 Alexander Motin <mav@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/*
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* MPPC decompression library.
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* Version 1.0
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*
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* Note that Hi/Fn (later acquired by Exar Corporation) held US patents
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* on some implementation-critical aspects of MPPC compression.
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* These patents lapsed due to non-payment of fees in 2007 and by 2015
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* expired altogether.
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*/
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#ifndef _NET_MPPC_H_
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#define _NET_MPPC_H_
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#define MPPC_MANDATORY_COMPRESS_FLAGS 0
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#define MPPC_MANDATORY_DECOMPRESS_FLAGS 0
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#define MPPC_SAVE_HISTORY 1
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#define MPPC_OK 5
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#define MPPC_EXPANDED 8
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#define MPPC_RESTART_HISTORY 16
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#define MPPC_DEST_EXHAUSTED 32
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extern size_t MPPC_SizeOfCompressionHistory(void);
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extern size_t MPPC_SizeOfDecompressionHistory(void);
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extern void MPPC_InitCompressionHistory(char *history);
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extern void MPPC_InitDecompressionHistory(char *history);
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extern int MPPC_Compress(u_char **src, u_char **dst, u_long *srcCnt, u_long *dstCnt, char *history, int flags, int undef);
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extern int MPPC_Decompress(u_char **src, u_char **dst, u_long *srcCnt, u_long *dstCnt, char *history, int flags);
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#endif
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