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 #include <sys/systm.h> 32 33 #include "zlib.h" 34 35 /* 36 * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store 37 * the expected decompressed data size externally so it can be passed in. 38 * The resulting decompressed size is then returned through dstlen. This 39 * function return Z_OK on success, or another error code on failure. 40 */ 41 int 42 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) 43 { 44 z_stream zs; 45 int err; 46 47 bzero(&zs, sizeof (zs)); 48 zs.next_in = (uchar_t *)src; 49 zs.avail_in = srclen; 50 zs.next_out = dst; 51 zs.avail_out = *dstlen; 52 53 if ((err = inflateInit(&zs)) != Z_OK) 54 return (err); 55 56 if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { 57 (void) inflateEnd(&zs); 58 return (err == Z_OK ? Z_BUF_ERROR : err); 59 } 60 61 *dstlen = zs.total_out; 62 return (inflateEnd(&zs)); 63 } 64 65 static const char *const z_errmsg[] = { 66 "need dictionary", /* Z_NEED_DICT 2 */ 67 "stream end", /* Z_STREAM_END 1 */ 68 "", /* Z_OK 0 */ 69 "file error", /* Z_ERRNO (-1) */ 70 "stream error", /* Z_STREAM_ERROR (-2) */ 71 "data error", /* Z_DATA_ERROR (-3) */ 72 "insufficient memory", /* Z_MEM_ERROR (-4) */ 73 "buffer error", /* Z_BUF_ERROR (-5) */ 74 "incompatible version" /* Z_VERSION_ERROR (-6) */ 75 }; 76 77 /* 78 * Convert a zlib error code into a string error message. 79 */ 80 const char * 81 z_strerror(int err) 82 { 83 int i = Z_NEED_DICT - err; 84 85 if (i < 0 || i >= sizeof (z_errmsg) / sizeof (z_errmsg[0])) 86 return ("unknown error"); 87 88 return (z_errmsg[i]); 89 } 90