/usr.bin/gzip/unxz.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 153 lines · 96 code · 22 blank · 35 comment · 27 complexity · 28f8d62555bda3f7bcf3fd0e2c1ec54a MD5 · raw file
- /* $NetBSD: unxz.c,v 1.5 2011/09/30 01:32:21 christos Exp $ */
- /*-
- * Copyright (c) 2011 The NetBSD Foundation, Inc.
- * All rights reserved.
- *
- * This code is derived from software contributed to The NetBSD Foundation
- * by Christos Zoulas.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
- * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
- * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
- * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- */
- #include <sys/cdefs.h>
- __FBSDID("$FreeBSD$");
- #include <stdarg.h>
- #include <errno.h>
- #include <stdio.h>
- #include <unistd.h>
- #include <lzma.h>
- static off_t
- unxz(int i, int o, char *pre, size_t prelen, off_t *bytes_in)
- {
- lzma_stream strm = LZMA_STREAM_INIT;
- static const int flags = LZMA_TELL_UNSUPPORTED_CHECK|LZMA_CONCATENATED;
- lzma_ret ret;
- lzma_action action = LZMA_RUN;
- off_t bytes_out, bp;
- uint8_t ibuf[BUFSIZ];
- uint8_t obuf[BUFSIZ];
- if (bytes_in == NULL)
- bytes_in = &bp;
- strm.next_in = ibuf;
- memcpy(ibuf, pre, prelen);
- strm.avail_in = read(i, ibuf + prelen, sizeof(ibuf) - prelen);
- if (strm.avail_in == (size_t)-1)
- maybe_err("read failed");
- strm.avail_in += prelen;
- *bytes_in = strm.avail_in;
- if ((ret = lzma_stream_decoder(&strm, UINT64_MAX, flags)) != LZMA_OK)
- maybe_errx("Can't initialize decoder (%d)", ret);
- strm.next_out = NULL;
- strm.avail_out = 0;
- if ((ret = lzma_code(&strm, LZMA_RUN)) != LZMA_OK)
- maybe_errx("Can't read headers (%d)", ret);
- bytes_out = 0;
- strm.next_out = obuf;
- strm.avail_out = sizeof(obuf);
- for (;;) {
- if (strm.avail_in == 0) {
- strm.next_in = ibuf;
- strm.avail_in = read(i, ibuf, sizeof(ibuf));
- switch (strm.avail_in) {
- case (size_t)-1:
- maybe_err("read failed");
- /*NOTREACHED*/
- case 0:
- action = LZMA_FINISH;
- break;
- default:
- *bytes_in += strm.avail_in;
- break;
- }
- }
- ret = lzma_code(&strm, action);
- // Write and check write error before checking decoder error.
- // This way as much data as possible gets written to output
- // even if decoder detected an error.
- if (strm.avail_out == 0 || ret != LZMA_OK) {
- const size_t write_size = sizeof(obuf) - strm.avail_out;
- if (write(o, obuf, write_size) != (ssize_t)write_size)
- maybe_err("write failed");
- strm.next_out = obuf;
- strm.avail_out = sizeof(obuf);
- bytes_out += write_size;
- }
- if (ret != LZMA_OK) {
- if (ret == LZMA_STREAM_END) {
- // Check that there's no trailing garbage.
- if (strm.avail_in != 0 || read(i, ibuf, 1))
- ret = LZMA_DATA_ERROR;
- else {
- lzma_end(&strm);
- return bytes_out;
- }
- }
- const char *msg;
- switch (ret) {
- case LZMA_MEM_ERROR:
- msg = strerror(ENOMEM);
- break;
- case LZMA_FORMAT_ERROR:
- msg = "File format not recognized";
- break;
- case LZMA_OPTIONS_ERROR:
- // FIXME: Better message?
- msg = "Unsupported compression options";
- break;
- case LZMA_DATA_ERROR:
- msg = "File is corrupt";
- break;
- case LZMA_BUF_ERROR:
- msg = "Unexpected end of input";
- break;
- case LZMA_MEMLIMIT_ERROR:
- msg = "Reached memory limit";
- break;
- default:
- maybe_errx("Unknown error (%d)", ret);
- break;
- }
- maybe_errx("%s", msg);
- }
- }
- }