/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2007 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Portions Copyright 2022 Mikhail Zakharov */ #include #include static void * zfs_zcalloc(void *opaque __unused, uint_t items, uint_t size) { return (calloc(items, size)); } static void zfs_zcfree(void *opaque __unused, void *ptr) { free(ptr); } /* * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store * the expected decompressed data size externally so it can be passed in. * The resulting decompressed size is then returned through dstlen. This * function return Z_OK on success, or another error code on failure. */ static inline int z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) { z_stream zs; int err; bzero(&zs, sizeof (zs)); zs.next_in = (unsigned char *)src; zs.avail_in = srclen; zs.next_out = dst; zs.avail_out = *dstlen; zs.zalloc = zfs_zcalloc; zs.zfree = zfs_zcfree; /* * Call inflateInit2() specifying a window size of DEF_WBITS * with the 6th bit set to indicate that the compression format * type (zlib or gzip) should be automatically detected. */ if ((err = inflateInit2(&zs, DEF_WBITS | 0x20)) != Z_OK) return (err); if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { (void) inflateEnd(&zs); return (err == Z_OK ? Z_BUF_ERROR : err); } *dstlen = zs.total_out; return (inflateEnd(&zs)); } static int gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, int n __unused) { size_t dstlen = d_len; ASSERT(d_len >= s_len); if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK) return (-1); return (0); }