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