1 /* 2 * This file and its contents are supplied under the terms of the 3 * Common Development and Distribution License ("CDDL"), version 1.0. 4 * You may only use this file in accordance with the terms of version 5 * 1.0 of the CDDL. 6 * 7 * A full copy of the text of the CDDL should have accompanied this 8 * source. A copy of the CDDL is also available via the Internet at 9 * http://www.illumos.org/license/CDDL. 10 */ 11 12 /* 13 * Copyright 2015 Toomas Soome <tsoome@me.com> 14 * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 15 * Use is subject to license terms. 16 */ 17 18 #include <zlib.h> 19 #include <strings.h> 20 21 int gzip_decompress(void *, void *, size_t, size_t, int); 22 /* 23 * Uncompress the buffer 'src' into the buffer 'dst'. The caller must store 24 * the expected decompressed data size externally so it can be passed in. 25 * The resulting decompressed size is then returned through dstlen. This 26 * function return Z_OK on success, or another error code on failure. 27 */ 28 static int 29 z_uncompress(void *dst, size_t *dstlen, const void *src, size_t srclen) 30 { 31 z_stream zs; 32 int err; 33 34 bzero(&zs, sizeof (zs)); 35 zs.next_in = (unsigned char *)src; 36 zs.avail_in = srclen; 37 zs.next_out = dst; 38 zs.avail_out = *dstlen; 39 40 /* 41 * Call inflateInit2() specifying a window size of DEF_WBITS 42 * with the 6th bit set to indicate that the compression format 43 * type (zlib or gzip) should be automatically detected. 44 */ 45 if ((err = inflateInit2(&zs, 15 | 0x20)) != Z_OK) 46 return (err); 47 48 if ((err = inflate(&zs, Z_FINISH)) != Z_STREAM_END) { 49 (void) inflateEnd(&zs); 50 return (err == Z_OK ? Z_BUF_ERROR : err); 51 } 52 53 *dstlen = zs.total_out; 54 return (inflateEnd(&zs)); 55 } 56 57 int 58 gzip_decompress(void *s_start, void *d_start, size_t s_len, size_t d_len, 59 int n __unused) 60 { 61 size_t dstlen = d_len; 62 63 if (z_uncompress(d_start, &dstlen, s_start, s_len) != Z_OK) 64 return (-1); 65 66 return (0); 67 } 68