Prepare SPL repo to merge with ZFS repo

[mirror_spl.git] / include / spl / sys / zmod.h

/*
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://zfsonlinux.org/>.
 *
 *  The SPL is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  The SPL is distributed in the hope that it will be useful, but WITHOUT
 *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
 *
 *
 *  z_compress_level/z_uncompress are nearly identical copies of the
 *  compress2/uncompress functions provided by the official zlib package
 *  available at http://zlib.net/.  The only changes made we to slightly
 *  adapt the functions called to match the linux kernel implementation
 *  of zlib.  The full zlib license follows:
 *
 *  zlib.h -- interface of the 'zlib' general purpose compression library
 *  version 1.2.5, April 19th, 2010
 *
 *  Copyright (C) 1995-2010 Jean-loup Gailly and Mark Adler
 *
 *  This software is provided 'as-is', without any express or implied
 *  warranty.  In no event will the authors be held liable for any damages
 *  arising from the use of this software.
 *
 *  Permission is granted to anyone to use this software for any purpose,
 *  including commercial applications, and to alter it and redistribute it
 *  freely, subject to the following restrictions:
 *
 *  1. The origin of this software must not be misrepresented; you must not
 *     claim that you wrote the original software. If you use this software
 *     in a product, an acknowledgment in the product documentation would be
 *     appreciated but is not required.
 *  2. Altered source versions must be plainly marked as such, and must not be
 *     misrepresented as being the original software.
 *  3. This notice may not be removed or altered from any source distribution.
 *
 *  Jean-loup Gailly
 *  Mark Adler
 */

#ifndef _SPL_ZMOD_H
#define	_SPL_ZMOD_H

#include <sys/types.h>
#include <linux/zlib.h>

#ifdef HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE
#define	spl_zlib_deflate_workspacesize(wb, ml) \
	zlib_deflate_workspacesize(wb, ml)
#else
#define	spl_zlib_deflate_workspacesize(wb, ml) \
	zlib_deflate_workspacesize()
#endif /* HAVE_2ARGS_ZLIB_DEFLATE_WORKSPACESIZE */

extern int z_compress_level(void *dest, size_t *destLen, const void *source,
    size_t sourceLen, int level);
extern int z_uncompress(void *dest, size_t *destLen, const void *source,
    size_t sourceLen);

int spl_zlib_init(void);
void spl_zlib_fini(void);

#endif /* SPL_ZMOD_H */