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/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2008 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/modctl.h>
#include <sys/zmod.h>
#include <zlib.h>
#include <zutil.h>
/*
* Uncompress the buffer 'src' into the buffer 'dst'. The caller must store
* the expected decompressed data size externally so it can be passed in.
* The resulting decompressed size is then returned through dstlen. This
* function return Z_OK on success, or another error code on failure.
*/
int
z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
{
z_stream zs;
int err;
bzero(&zs, sizeof (zs));
zs.next_in = (uchar_t *)src;
zs.avail_in = srclen;
zs.next_out = dst;
zs.avail_out = *dstlen;
/*
* Call inflateInit2() specifying a window size of DEF_WBITS
* with the 6th bit set to indicate that the compression format
* type (zlib or gzip) should be automatically detected.
*/
if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK)
return (err);
if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
(void) inflateEnd(&zs);
return (err == Z_OK ? Z_BUF_ERROR : err);
}
*dstlen = zs.total_out;
return (inflateEnd(&zs));
}
int
z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
int level)
{
z_stream zs;
int err;
bzero(&zs, sizeof (zs));
zs.next_in = (uchar_t *)src;
zs.avail_in = srclen;
zs.next_out = dst;
zs.avail_out = *dstlen;
if ((err = deflateInit(&zs, level)) != Z_OK)
return (err);
if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) {
(void) deflateEnd(&zs);
return (err == Z_OK ? Z_BUF_ERROR : err);
}
*dstlen = zs.total_out;
return (deflateEnd(&zs));
}
int
z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen)
{
return (z_compress_level(dst, dstlen, src, srclen,
Z_DEFAULT_COMPRESSION));
}
/*
* Convert a zlib error code into a string error message.
*/
const char *
z_strerror(int err)
{
int i = Z_NEED_DICT - err;
if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR)
return ("unknown error");
return (zError(err));
}
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