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 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD$"); 29 30 #include <sys/param.h> 31 #include <err.h> 32 #include <stdint.h> 33 34 #include <zlib.h> 35 36 #include "mkuzip.h" 37 #include "mkuz_blk.h" 38 #include "mkuz_zlib.h" 39 40 struct mkuz_zlib { 41 int comp_level; 42 }; 43 44 size_t 45 mkuz_zlib_cbound(size_t blksz) 46 { 47 return (compressBound(blksz)); 48 } 49 50 void * 51 mkuz_zlib_init(int *comp_level) 52 { 53 struct mkuz_zlib *zp; 54 55 if (*comp_level == USE_DEFAULT_LEVEL) 56 *comp_level = Z_BEST_COMPRESSION; 57 if (*comp_level < Z_BEST_SPEED || *comp_level > Z_BEST_COMPRESSION) 58 errx(1, "provided compression level %d is invalid", 59 *comp_level); 60 /* Not reached */ 61 62 zp = mkuz_safe_zmalloc(sizeof(struct mkuz_zlib)); 63 zp->comp_level = *comp_level; 64 65 return (zp); 66 } 67 68 void 69 mkuz_zlib_compress(void *p, const struct mkuz_blk *iblk, struct mkuz_blk *oblk) 70 { 71 uLongf destlen_z; 72 struct mkuz_zlib *zp; 73 74 zp = (struct mkuz_zlib *)p; 75 76 destlen_z = oblk->alen; 77 if (compress2(oblk->data, &destlen_z, iblk->data, iblk->info.len, 78 zp->comp_level) != Z_OK) { 79 errx(1, "can't compress data: compress2() failed"); 80 /* Not reached */ 81 } 82 83 oblk->info.len = (uint32_t)destlen_z; 84 } 85