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 2008 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #include <sys/modctl.h> 28 #include <sys/zmod.h> 29 30 #include <zlib.h> 31 #include <zutil.h> 32 33 /* 34 * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store 35 * the expected decompressed data size externally so it can be passed in. 36 * The resulting decompressed size is then returned through dstlen. This 37 * function return Z_OK on success, or another error code on failure. 38 */ 39 int 40 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) 41 { 42 z_stream zs; 43 int err; 44 45 bzero(&zs, sizeof (zs)); 46 zs.next_in = (uchar_t *)src; 47 zs.avail_in = srclen; 48 zs.next_out = dst; 49 zs.avail_out = *dstlen; 50 51 /* 52 * Call inflateInit2() specifying a window size of DEF_WBITS 53 * with the 6th bit set to indicate that the compression format 54 * type (zlib or gzip) should be automatically detected. 55 */ 56 if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK) 57 return (err); 58 59 if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { 60 (void) inflateEnd(&zs); 61 return (err == Z_OK ? Z_BUF_ERROR : err); 62 } 63 64 *dstlen = zs.total_out; 65 return (inflateEnd(&zs)); 66 } 67 68 int 69 z_compress_level(void *dst, size_t *dstlen, const void *src, size_t srclen, 70 int level) 71 { 72 73 z_stream zs; 74 int err; 75 76 bzero(&zs, sizeof (zs)); 77 zs.next_in = (uchar_t *)src; 78 zs.avail_in = srclen; 79 zs.next_out = dst; 80 zs.avail_out = *dstlen; 81 82 if ((err = deflateInit(&zs, level)) != Z_OK) 83 return (err); 84 85 if ((err = deflate(&zs, Z_FINISH)) != Z_STREAM_END) { 86 (void) deflateEnd(&zs); 87 return (err == Z_OK ? Z_BUF_ERROR : err); 88 } 89 90 *dstlen = zs.total_out; 91 return (deflateEnd(&zs)); 92 } 93 94 int 95 z_compress(void *dst, size_t *dstlen, const void *src, size_t srclen) 96 { 97 return (z_compress_level(dst, dstlen, src, srclen, 98 Z_DEFAULT_COMPRESSION)); 99 } 100 101 /* 102 * Convert a zlib error code into a string error message. 103 */ 104 const char * 105 z_strerror(int err) 106 { 107 int i = Z_NEED_DICT - err; 108 109 if (i < 0 || i > Z_NEED_DICT - Z_VERSION_ERROR) 110 return ("unknown error"); 111 112 return (zError(err)); 113 } 114