diff options
Diffstat (limited to 'file_cmds/gzip/unxz.c')
| -rw-r--r-- | file_cmds/gzip/unxz.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/file_cmds/gzip/unxz.c b/file_cmds/gzip/unxz.c new file mode 100644 index 0000000..df48ae3 --- /dev/null +++ b/file_cmds/gzip/unxz.c @@ -0,0 +1,153 @@ +/* $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: src/usr.bin/gzip/unxz.c,v 1.2 2011/10/16 07:35:26 delphij Exp $"); + +#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); + + } + } +} |