1210008Srdivacky/* 2210008Srdivacky * CDDL HEADER START 3210008Srdivacky * 4210008Srdivacky * The contents of this file are subject to the terms of the 5210008Srdivacky * Common Development and Distribution License (the "License"). 6210008Srdivacky * You may not use this file except in compliance with the License. 7210008Srdivacky * 8210008Srdivacky * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9210008Srdivacky * or http://www.opensolaris.org/os/licensing. 10221345Sdim * See the License for the specific language governing permissions 11210008Srdivacky * and limitations under the License. 12210008Srdivacky * 13210008Srdivacky * When distributing Covered Code, include this CDDL HEADER in each 14210008Srdivacky * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15210008Srdivacky * If applicable, add the following below this CDDL HEADER, with the 16210008Srdivacky * fields enclosed by brackets "[]" replaced with your own identifying 17210008Srdivacky * information: Portions Copyright [yyyy] [name of copyright owner] 18210008Srdivacky * 19263508Sdim * CDDL HEADER END 20263508Sdim */ 21210008Srdivacky 22210008Srdivacky/* 23263508Sdim * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 24263508Sdim * Use is subject to license terms. 25210008Srdivacky */ 26210008Srdivacky 27210008Srdivacky/* 28210008Srdivacky * Portions Copyright 2022 Mikhail Zakharov <zmey20000@yahoo.com> 29210008Srdivacky */ 30210008Srdivacky 31212904Sdim#include <contrib/zlib/zlib.h> 32210008Srdivacky#include <contrib/zlib/zutil.h> 33218893Sdim 34210008Srdivackystatic void * 35263508Sdimzfs_zcalloc(void *opaque __unused, uint_t items, uint_t size) 36263508Sdim{ 37251662Sdim 38251662Sdim return (calloc(items, size)); 39251662Sdim} 40251662Sdim 41251662Sdimstatic void 42251662Sdimzfs_zcfree(void *opaque __unused, void *ptr) 43263508Sdim{ 44251662Sdim free(ptr); 45251662Sdim} 46251662Sdim 47251662Sdim/* 48239462Sdim * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store 49243830Sdim * the expected decompressed data size externally so it can be passed in. 50243830Sdim * The resulting decompressed size is then returned through dstlen. This 51243830Sdim * function return Z_OK on success, or another error code on failure. 52239462Sdim */ 53263508Sdimstatic inline int 54263508Sdimz_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) 55243830Sdim{ 56243830Sdim z_stream zs; 57243830Sdim int err; 58243830Sdim 59263508Sdim bzero(&zs, sizeof (zs)); 60263508Sdim zs.next_in = (unsigned char *)src; 61263508Sdim zs.avail_in = srclen; 62263508Sdim zs.next_out = dst; 63263508Sdim zs.avail_out = *dstlen; 64212904Sdim zs.zalloc = zfs_zcalloc; 65212904Sdim zs.zfree = zfs_zcfree; 66212904Sdim 67243830Sdim /* 68212904Sdim * Call inflateInit2() specifying a window size of DEF_WBITS 69263508Sdim * with the 6th bit set to indicate that the compression format 70263508Sdim * type (zlib or gzip) should be automatically detected. 71249423Sdim */ 72263508Sdim if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK) 73263508Sdim return (err); 74263508Sdim 75263508Sdim if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { 76263508Sdim (void) inflateEnd(&zs); 77263508Sdim return (err == Z_OK ? Z_BUF_ERROR : err); 78263508Sdim } 79263508Sdim 80263508Sdim *dstlen = zs.total_out; 81263508Sdim return (inflateEnd(&zs)); 82263508Sdim} 83263508Sdim 84263508Sdimstatic int 85263508Sdimgzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, 86263508Sdim int n __unused) 87263508Sdim{ 88263508Sdim size_t dstlen = d_len; 89263508Sdim 90263508Sdim ASSERT(d_len >= s_len); 91263508Sdim 92263508Sdim if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK) 93263508Sdim return (-1); 94263508Sdim 95263508Sdim return (0); 96263508Sdim} 97263508Sdim