1 /* 2 * CDDL HEADER START 3 * 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. 7 * 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. 12 * 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] 18 * 19 * CDDL HEADER END 20 */ 21 22 /* 23 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <sys/modctl.h> 30 #include <sys/zmod.h> 31 32 #include "zlib.h" 33 34 /* 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. 39 */ 40 int 41 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) 42 { 43 z_stream zs; 44 int err; 45 46 bzero(&zs, sizeof (zs)); 47 zs.next_in = (uchar_t *)src; 48 zs.avail_in = srclen; 49 zs.next_out = dst; 50 zs.avail_out = *dstlen; 51 52 if ((err = inflateInit(&zs)) != Z_OK) 53 return (err); 54 55 if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { 56 (void) inflateEnd(&zs); 57 return (err == Z_OK ? Z_BUF_ERROR : err); 58 } 59 60 *dstlen = zs.total_out; 61 return (inflateEnd(&zs)); 62 } 63 64 int 65 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen, 66 int level) 67 { 68 69 z_stream zs; 70 int err; 71 72 bzero(&zs, sizeof (zs)); 73 zs.next_in = (uchar_t *)src; 74 zs.avail_in = srclen; 75 zs.next_out = dst; 76 zs.avail_out = *dstlen; 77 78 if ((err = deflateInit(&zs, level)) != Z_OK) 79 return (err); 80 81 if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) { 82 (void) deflateEnd(&zs); 83 return (err == Z_OK ? Z_BUF_ERROR : err); 84 } 85 86 *dstlen = zs.total_out; 87 return (deflateEnd(&zs)); 88 } 89 90 int 91 z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen) 92 { 93 return (z_compress_level(dst, dstlen, src, srclen, 94 Z_DEFAULT_COMPRESSION)); 95 } 96 97 /* 98 * Convert a zlib error code into a string error message. 99 */ 100 const char * 101 z_strerror(int err) 102 { 103 int i = Z_NEED_DICT - err; 104 105 if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR) 106 return ("unknown error"); 107 108 return (zError(err)); 109 } 110