1 /* $NetBSD: unbzip2.c,v 1.13 2009/12/05 03:23:37 mrg Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Simon Burge. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 /* This file is #included by gzip.c */ 33 34 static off_t 35 unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in) 36 { 37 int ret, end_of_file, cold = 0; 38 off_t bytes_out = 0; 39 bz_stream bzs; 40 static char *inbuf, *outbuf; 41 42 if (inbuf == NULL) 43 inbuf = malloc(BUFLEN); 44 if (outbuf == NULL) 45 outbuf = malloc(BUFLEN); 46 if (inbuf == NULL || outbuf == NULL) 47 maybe_err("malloc"); 48 49 bzs.bzalloc = NULL; 50 bzs.bzfree = NULL; 51 bzs.opaque = NULL; 52 53 end_of_file = 0; 54 ret = BZ2_bzDecompressInit(&bzs, 0, 0); 55 if (ret != BZ_OK) 56 maybe_errx("bzip2 init"); 57 58 /* Prepend. */ 59 bzs.avail_in = prelen; 60 bzs.next_in = pre; 61 62 if (bytes_in) 63 *bytes_in = prelen; 64 65 while (ret == BZ_OK) { 66 if (bzs.avail_in == 0 && !end_of_file) { 67 ssize_t n; 68 69 n = read(in, inbuf, BUFLEN); 70 if (n < 0) 71 maybe_err("read"); 72 if (n == 0) 73 end_of_file = 1; 74 bzs.next_in = inbuf; 75 bzs.avail_in = n; 76 if (bytes_in) 77 *bytes_in += n; 78 } 79 80 bzs.next_out = outbuf; 81 bzs.avail_out = BUFLEN; 82 ret = BZ2_bzDecompress(&bzs); 83 84 switch (ret) { 85 case BZ_STREAM_END: 86 case BZ_OK: 87 if (ret == BZ_OK && end_of_file) { 88 /* 89 * If we hit this after a stream end, consider 90 * it as the end of the whole file and don't 91 * bail out. 92 */ 93 if (cold == 1) 94 ret = BZ_STREAM_END; 95 else 96 maybe_errx("truncated file"); 97 } 98 cold = 0; 99 if (!tflag && bzs.avail_out != BUFLEN) { 100 ssize_t n; 101 102 n = write(out, outbuf, BUFLEN - bzs.avail_out); 103 if (n < 0) 104 maybe_err("write"); 105 bytes_out += n; 106 } 107 if (ret == BZ_STREAM_END && !end_of_file) { 108 if (BZ2_bzDecompressEnd(&bzs) != BZ_OK || 109 BZ2_bzDecompressInit(&bzs, 0, 0) != BZ_OK) 110 maybe_errx("bzip2 re-init"); 111 cold = 1; 112 ret = BZ_OK; 113 } 114 break; 115 116 case BZ_DATA_ERROR: 117 maybe_warnx("bzip2 data integrity error"); 118 break; 119 120 case BZ_DATA_ERROR_MAGIC: 121 maybe_warnx("bzip2 magic number error"); 122 break; 123 124 case BZ_MEM_ERROR: 125 maybe_warnx("bzip2 out of memory"); 126 break; 127 128 default: 129 maybe_warnx("unknown bzip2 error: %d", ret); 130 break; 131 } 132 } 133 134 if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK) 135 return (-1); 136 137 return (bytes_out); 138 } 139