1 /* 2 * Copyright (c) 2004-2016 Maxim Sobolev <sobomax@FreeBSD.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 */ 27 28 #include <sys/cdefs.h> 29 __FBSDID("$FreeBSD$"); 30 31 #include <sys/param.h> 32 #include <err.h> 33 #include <stdint.h> 34 35 #include <zlib.h> 36 37 #include "mkuzip.h" 38 #include "mkuz_zlib.h" 39 40 struct mkuz_zlib { 41 char *obuf; 42 uLongf oblen; 43 uint32_t blksz; 44 }; 45 46 static struct mkuz_zlib uzip; 47 48 void * 49 mkuz_zlib_init(uint32_t blksz) 50 { 51 if (blksz % DEV_BSIZE != 0) { 52 errx(1, "cluster size should be multiple of %d", 53 DEV_BSIZE); 54 /* Not reached */ 55 } 56 if (compressBound(blksz) > MAXPHYS) { 57 errx(1, "cluster size is too large"); 58 /* Not reached */ 59 } 60 uzip.oblen = compressBound(blksz); 61 uzip.obuf = mkuz_safe_malloc(uzip.oblen); 62 uzip.blksz = blksz; 63 64 return (uzip.obuf); 65 } 66 67 void 68 mkuz_zlib_compress(const char *ibuf, uint32_t *destlen) 69 { 70 uLongf destlen_z; 71 72 destlen_z = uzip.oblen; 73 if (compress2(uzip.obuf, &destlen_z, ibuf, uzip.blksz, 74 Z_BEST_COMPRESSION) != Z_OK) { 75 errx(1, "can't compress data: compress2() " 76 "failed"); 77 /* Not reached */ 78 } 79 80 *destlen = (uint32_t)destlen_z; 81 } 82