154 lines
4.2 KiB
C
154 lines
4.2 KiB
C
/* $NetBSD: unxz.c,v 1.6 2016/01/29 15:19:01 christos Exp $ */
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/*-
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* Copyright (c) 2011 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Christos Zoulas.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <stdarg.h>
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#include <errno.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <lzma.h>
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static off_t
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unxz(int i, int o, char *pre, size_t prelen, off_t *bytes_in)
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{
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lzma_stream strm = LZMA_STREAM_INIT;
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static const int flags = LZMA_TELL_UNSUPPORTED_CHECK|LZMA_CONCATENATED;
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lzma_ret ret;
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lzma_action action = LZMA_RUN;
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off_t bytes_out, bp;
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uint8_t ibuf[BUFSIZ];
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uint8_t obuf[BUFSIZ];
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if (bytes_in == NULL)
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bytes_in = &bp;
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strm.next_in = ibuf;
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memcpy(ibuf, pre, prelen);
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strm.avail_in = read(i, ibuf + prelen, sizeof(ibuf) - prelen);
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if (strm.avail_in == (size_t)-1)
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maybe_err("read failed");
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strm.avail_in += prelen;
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*bytes_in = strm.avail_in;
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if ((ret = lzma_stream_decoder(&strm, UINT64_MAX, flags)) != LZMA_OK)
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maybe_errx("Can't initialize decoder (%d)", ret);
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strm.next_out = NULL;
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strm.avail_out = 0;
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if ((ret = lzma_code(&strm, LZMA_RUN)) != LZMA_OK)
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maybe_errx("Can't read headers (%d)", ret);
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bytes_out = 0;
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strm.next_out = obuf;
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strm.avail_out = sizeof(obuf);
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for (;;) {
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if (strm.avail_in == 0) {
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strm.next_in = ibuf;
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strm.avail_in = read(i, ibuf, sizeof(ibuf));
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switch (strm.avail_in) {
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case (size_t)-1:
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maybe_err("read failed");
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/*NOTREACHED*/
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case 0:
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action = LZMA_FINISH;
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break;
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default:
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*bytes_in += strm.avail_in;
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break;
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}
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}
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ret = lzma_code(&strm, action);
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// Write and check write error before checking decoder error.
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// This way as much data as possible gets written to output
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// even if decoder detected an error.
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if (strm.avail_out == 0 || ret != LZMA_OK) {
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const size_t write_size = sizeof(obuf) - strm.avail_out;
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if (write(o, obuf, write_size) != (ssize_t)write_size)
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maybe_err("write failed");
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strm.next_out = obuf;
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strm.avail_out = sizeof(obuf);
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bytes_out += write_size;
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}
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if (ret != LZMA_OK) {
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if (ret == LZMA_STREAM_END) {
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// Check that there's no trailing garbage.
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if (strm.avail_in != 0 || read(i, ibuf, 1))
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ret = LZMA_DATA_ERROR;
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else {
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lzma_end(&strm);
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return bytes_out;
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}
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}
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const char *msg;
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switch (ret) {
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case LZMA_MEM_ERROR:
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msg = strerror(ENOMEM);
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break;
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case LZMA_FORMAT_ERROR:
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msg = "File format not recognized";
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break;
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case LZMA_OPTIONS_ERROR:
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// FIXME: Better message?
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msg = "Unsupported compression options";
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break;
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case LZMA_DATA_ERROR:
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msg = "File is corrupt";
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break;
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case LZMA_BUF_ERROR:
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msg = "Unexpected end of input";
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break;
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case LZMA_MEMLIMIT_ERROR:
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msg = "Reached memory limit";
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break;
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default:
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maybe_errx("Unknown error (%d)", ret);
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break;
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}
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maybe_errx("%s", msg);
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}
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}
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}
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