1 /* $NetBSD: unxz.c,v 1.7 2017/08/04 07:27:08 mrg Exp $ */
4 * SPDX-License-Identifier: BSD-2-Clause-NetBSD
6 * Copyright (c) 2011 The NetBSD Foundation, Inc.
9 * This code is derived from software contributed to The NetBSD Foundation
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
21 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
23 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
24 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
25 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
26 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
27 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
29 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
30 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
31 * POSSIBILITY OF SUCH DAMAGE.
33 #include <sys/cdefs.h>
34 __FBSDID("$FreeBSD$");
43 unxz(int i, int o, char *pre, size_t prelen, off_t *bytes_in)
45 lzma_stream strm = LZMA_STREAM_INIT;
46 static const int flags = LZMA_TELL_UNSUPPORTED_CHECK|LZMA_CONCATENATED;
48 lzma_action action = LZMA_RUN;
57 memcpy(ibuf, pre, prelen);
58 strm.avail_in = read(i, ibuf + prelen, sizeof(ibuf) - prelen);
59 if (strm.avail_in == (size_t)-1)
60 maybe_err("read failed");
61 infile_newdata(strm.avail_in);
62 strm.avail_in += prelen;
63 *bytes_in = strm.avail_in;
65 if ((ret = lzma_stream_decoder(&strm, UINT64_MAX, flags)) != LZMA_OK)
66 maybe_errx("Can't initialize decoder (%d)", ret);
70 if ((ret = lzma_code(&strm, LZMA_RUN)) != LZMA_OK)
71 maybe_errx("Can't read headers (%d)", ret);
75 strm.avail_out = sizeof(obuf);
79 if (strm.avail_in == 0) {
81 strm.avail_in = read(i, ibuf, sizeof(ibuf));
82 switch (strm.avail_in) {
84 maybe_err("read failed");
90 infile_newdata(strm.avail_in);
91 *bytes_in += strm.avail_in;
96 ret = lzma_code(&strm, action);
98 // Write and check write error before checking decoder error.
99 // This way as much data as possible gets written to output
100 // even if decoder detected an error.
101 if (strm.avail_out == 0 || ret != LZMA_OK) {
102 const size_t write_size = sizeof(obuf) - strm.avail_out;
104 if (write(o, obuf, write_size) != (ssize_t)write_size)
105 maybe_err("write failed");
107 strm.next_out = obuf;
108 strm.avail_out = sizeof(obuf);
109 bytes_out += write_size;
112 if (ret != LZMA_OK) {
113 if (ret == LZMA_STREAM_END) {
114 // Check that there's no trailing garbage.
115 if (strm.avail_in != 0 || read(i, ibuf, 1))
116 ret = LZMA_DATA_ERROR;
126 msg = strerror(ENOMEM);
129 case LZMA_FORMAT_ERROR:
130 msg = "File format not recognized";
133 case LZMA_OPTIONS_ERROR:
134 // FIXME: Better message?
135 msg = "Unsupported compression options";
138 case LZMA_DATA_ERROR:
139 msg = "File is corrupt";
143 msg = "Unexpected end of input";
146 case LZMA_MEMLIMIT_ERROR:
147 msg = "Reached memory limit";
151 maybe_errx("Unknown error (%d)", ret);
154 maybe_errx("%s", msg);