/*
* Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
#include <sys/param.h>
#include <err.h>
#include <stdint.h>
#include <zlib.h>
#include "mkuzip.h"
#include "mkuz_blk.h"
#include "mkuz_zlib.h"
struct mkuz_zlib {
int comp_level;
};
size_t
mkuz_zlib_cbound(size_t blksz)
{
return (compressBound(blksz));
}
void *
mkuz_zlib_init(int *comp_level)
{
struct mkuz_zlib *zp;
if (*comp_level == USE_DEFAULT_LEVEL)
*comp_level = Z_BEST_COMPRESSION;
if (*comp_level < Z_BEST_SPEED || *comp_level > Z_BEST_COMPRESSION)
errx(1, "provided compression level %d is invalid",
*comp_level);
/* Not reached */
zp = mkuz_safe_zmalloc(sizeof(struct mkuz_zlib));
zp->comp_level = *comp_level;
return (zp);
}
void
mkuz_zlib_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk)
{
uLongf destlen_z;
struct mkuz_zlib *zp;
zp = (struct mkuz_zlib *)p;
destlen_z = oblk->alen;
if (compress2(oblk->data, &destlen_z, iblk->data, iblk->info.len,
zp->comp_level) != Z_OK) {
errx(1, "can't compress data: compress2() failed");
/* Not reached */
}
oblk->info.len = (uint32_t)destlen_z;
}