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