4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
27 #pragma ident "%Z%%M% %I% %E% SMI"
29 #include <sys/types.h>
35 * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store
36 * the expected decompressed data size externally so it can be passed in.
37 * The resulting decompressed size is then returned through dstlen. This
38 * function return Z_OK on success, or another error code on failure.
41 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen)
46 bzero(&zs, sizeof (zs));
47 zs.next_in = (uchar_t *)src;
50 zs.avail_out = *dstlen;
52 if ((err = inflateInit(&zs)) != Z_OK)
55 if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) {
56 (void) inflateEnd(&zs);
57 return (err == Z_OK ? Z_BUF_ERROR : err);
60 *dstlen = zs.total_out;
61 return (inflateEnd(&zs));
65 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen,
72 bzero(&zs, sizeof (zs));
73 zs.next_in = (uchar_t *)src;
76 zs.avail_out = *dstlen;
78 if ((err = deflateInit(&zs, level)) != Z_OK)
81 if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) {
82 (void) deflateEnd(&zs);
83 return (err == Z_OK ? Z_BUF_ERROR : err);
86 *dstlen = zs.total_out;
87 return (deflateEnd(&zs));
91 z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen)
93 return (z_compress_level(dst, dstlen, src, srclen,
94 Z_DEFAULT_COMPRESSION));
98 * Convert a zlib error code into a string error message.
103 int i = Z_NEED_DICT - err;
105 if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR)
106 return ("unknown error");
108 return (zError(err));