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6f443bec58
This is needed to avoid running into out of buffer situations where we cannot alloc a new buffer because we hit the array size limit (ZBUF). Use a combined allocation for the struct and the actual data buffer to not increase the number of malloc calls. [1] Defer initialization of zbuf until we actually need it. Make sure the output buffer will be large enough in all cases. Details discussed with: kib [1] Reviewed by: kib [1] MFC after: 6 days
61 lines
2.2 KiB
C
61 lines
2.2 KiB
C
/* $FreeBSD$ */
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/* $OpenBSD: deflate.h,v 1.3 2002/03/14 01:26:51 millert Exp $ */
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/*-
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* Copyright (c) 2001 Jean-Jacques Bernard-Gundol (jj@wabbitt.org)
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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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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following 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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Definition for the wrapper around the deflate compression
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* algorithm used in /sys/crypto
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*/
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#ifndef _CRYPTO_DEFLATE_H_
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#define _CRYPTO_DEFLATE_H_
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#include <net/zlib.h>
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#define Z_METHOD 8
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#define Z_MEMLEVEL 8
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#define MINCOMP 2 /* won't be used, but must be defined */
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#define ZBUF 10
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u_int32_t deflate_global(u_int8_t *, u_int32_t, int, u_int8_t **);
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void *z_alloc(void *, u_int, u_int);
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void z_free(void *, void *);
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/*
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* We are going to use a combined allocation to hold the metadata
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* from the struct immediately followed by the real application data.
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*/
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struct deflate_buf {
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struct deflate_buf *next;
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uint32_t size;
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uint8_t data[];
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};
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#endif /* _CRYPTO_DEFLATE_H_ */
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