c9f05bc8a1
Since FreeBSD doesn't have liblzma in the base system, the read side will always fall back to the unxz/unlzma commands for now. (Which will in turn fail if those commands are not currently installed.) The write side does not yet have a fallback, so that will just fail.
643 lines
17 KiB
C
643 lines
17 KiB
C
/*-
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* Copyright (c) 2009 Michihiro NAKAJIMA
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* Copyright (c) 2003-2008 Tim Kientzle and Miklos Vajna
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* All rights reserved.
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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 AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "archive_platform.h"
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__FBSDID("$FreeBSD$");
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#if HAVE_LZMA_H
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#include <lzma.h>
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#elif HAVE_LZMADEC_H
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#include <lzmadec.h>
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#endif
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#include "archive.h"
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#include "archive_private.h"
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#include "archive_read_private.h"
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#if HAVE_LZMA_H && HAVE_LIBLZMA
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struct private_data {
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lzma_stream stream;
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unsigned char *out_block;
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size_t out_block_size;
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int64_t total_out;
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char eof; /* True = found end of compressed data. */
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};
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/* Combined lzma/xz filter */
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static ssize_t xz_filter_read(struct archive_read_filter *, const void **);
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static int xz_filter_close(struct archive_read_filter *);
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static int xz_lzma_bidder_init(struct archive_read_filter *);
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#elif HAVE_LZMADEC_H && HAVE_LIBLZMADEC
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struct private_data {
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lzmadec_stream stream;
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unsigned char *out_block;
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size_t out_block_size;
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int64_t total_out;
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char eof; /* True = found end of compressed data. */
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};
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/* Lzma-only filter */
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static ssize_t lzma_filter_read(struct archive_read_filter *, const void **);
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static int lzma_filter_close(struct archive_read_filter *);
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#endif
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/*
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* Note that we can detect xz and lzma compressed files even if we
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* can't decompress them. (In fact, we like detecting them because we
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* can give better error messages.) So the bid framework here gets
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* compiled even if no lzma library is available.
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*/
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static int xz_bidder_bid(struct archive_read_filter_bidder *,
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struct archive_read_filter *);
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static int xz_bidder_init(struct archive_read_filter *);
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static int lzma_bidder_bid(struct archive_read_filter_bidder *,
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struct archive_read_filter *);
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static int lzma_bidder_init(struct archive_read_filter *);
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int
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archive_read_support_compression_xz(struct archive *_a)
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{
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struct archive_read *a = (struct archive_read *)_a;
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struct archive_read_filter_bidder *bidder = __archive_read_get_bidder(a);
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if (bidder == NULL)
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return (ARCHIVE_FATAL);
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bidder->data = NULL;
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bidder->bid = xz_bidder_bid;
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bidder->init = xz_bidder_init;
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bidder->options = NULL;
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bidder->free = NULL;
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#if HAVE_LZMA_H && HAVE_LIBLZMA
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return (ARCHIVE_OK);
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#else
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archive_set_error(_a, ARCHIVE_ERRNO_MISC,
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"Using external unxz program for xz decompression");
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return (ARCHIVE_WARN);
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#endif
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}
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int
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archive_read_support_compression_lzma(struct archive *_a)
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{
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struct archive_read *a = (struct archive_read *)_a;
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struct archive_read_filter_bidder *bidder = __archive_read_get_bidder(a);
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if (bidder == NULL)
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return (ARCHIVE_FATAL);
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bidder->data = NULL;
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bidder->bid = lzma_bidder_bid;
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bidder->init = lzma_bidder_init;
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bidder->options = NULL;
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bidder->free = NULL;
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#if HAVE_LZMA_H && HAVE_LIBLZMA
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return (ARCHIVE_OK);
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#elif HAVE_LZMADEC_H && HAVE_LIBLZMADEC
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return (ARCHIVE_OK);
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#else
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archive_set_error(_a, ARCHIVE_ERRNO_MISC,
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"Using external unlzma program for lzma decompression");
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return (ARCHIVE_WARN);
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#endif
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}
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/*
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* Test whether we can handle this data.
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*/
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static int
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xz_bidder_bid(struct archive_read_filter_bidder *self,
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struct archive_read_filter *filter)
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{
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const unsigned char *buffer;
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ssize_t avail;
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int bits_checked;
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(void)self; /* UNUSED */
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buffer = __archive_read_filter_ahead(filter, 6, &avail);
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if (buffer == NULL)
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return (0);
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/*
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* Verify Header Magic Bytes : FD 37 7A 58 5A 00
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*/
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bits_checked = 0;
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if (buffer[0] != 0xFD)
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return (0);
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bits_checked += 8;
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if (buffer[1] != 0x37)
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return (0);
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bits_checked += 8;
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if (buffer[2] != 0x7A)
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return (0);
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bits_checked += 8;
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if (buffer[3] != 0x58)
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return (0);
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bits_checked += 8;
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if (buffer[4] != 0x5A)
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return (0);
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bits_checked += 8;
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if (buffer[5] != 0x00)
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return (0);
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bits_checked += 8;
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return (bits_checked);
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}
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/*
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* Test whether we can handle this data.
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*
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* <sigh> LZMA has a rather poor file signature. Zeros do not
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* make good signature bytes as a rule, and the only non-zero byte
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* here is an ASCII character. For example, an uncompressed tar
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* archive whose first file is ']' would satisfy this check. It may
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* be necessary to exclude LZMA from compression_all() because of
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* this. Clients of libarchive would then have to explicitly enable
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* LZMA checking instead of (or in addition to) compression_all() when
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* they have other evidence (file name, command-line option) to go on.
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*/
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static int
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lzma_bidder_bid(struct archive_read_filter_bidder *self,
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struct archive_read_filter *filter)
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{
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const unsigned char *buffer;
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ssize_t avail;
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int bits_checked;
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(void)self; /* UNUSED */
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buffer = __archive_read_filter_ahead(filter, 6, &avail);
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if (buffer == NULL)
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return (0);
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/* First byte of raw LZMA stream is always 0x5d. */
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bits_checked = 0;
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if (buffer[0] != 0x5d)
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return (0);
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bits_checked += 8;
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/* Second through fifth bytes are dictionary code, stored in
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* little-endian order. The two least-significant bytes are
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* always zero. */
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if (buffer[1] != 0 || buffer[2] != 0)
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return (0);
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bits_checked += 16;
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/* ??? TODO: Fix this. ??? */
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/* NSIS format check uses this, but I've seen tar.lzma
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* archives where this byte is 0xff, not 0. Can it
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* ever be anything other than 0 or 0xff?
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*/
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#if 0
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if (buffer[5] != 0)
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return (0);
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bits_checked += 8;
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#endif
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/* TODO: The above test is still very weak. It would be
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* good to do better. */
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return (bits_checked);
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}
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#if HAVE_LZMA_H && HAVE_LIBLZMA
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/*
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* liblzma 4.999.7 and later support both lzma and xz streams.
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*/
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static int
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xz_bidder_init(struct archive_read_filter *self)
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{
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self->code = ARCHIVE_COMPRESSION_XZ;
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self->name = "xz";
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return (xz_lzma_bidder_init(self));
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}
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static int
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lzma_bidder_init(struct archive_read_filter *self)
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{
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self->code = ARCHIVE_COMPRESSION_LZMA;
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self->name = "lzma";
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return (xz_lzma_bidder_init(self));
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}
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/*
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* Setup the callbacks.
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*/
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static int
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xz_lzma_bidder_init(struct archive_read_filter *self)
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{
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static const size_t out_block_size = 64 * 1024;
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void *out_block;
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struct private_data *state;
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int ret;
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state = (struct private_data *)calloc(sizeof(*state), 1);
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out_block = (unsigned char *)malloc(out_block_size);
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if (state == NULL || out_block == NULL) {
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archive_set_error(&self->archive->archive, ENOMEM,
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"Can't allocate data for xz decompression");
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free(out_block);
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free(state);
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return (ARCHIVE_FATAL);
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}
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self->data = state;
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state->out_block_size = out_block_size;
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state->out_block = out_block;
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self->read = xz_filter_read;
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self->skip = NULL; /* not supported */
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self->close = xz_filter_close;
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state->stream.avail_in = 0;
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state->stream.next_out = state->out_block;
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state->stream.avail_out = state->out_block_size;
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/* Initialize compression library.
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* TODO: I don't know what value is best for memlimit.
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* maybe, it needs to check memory size which
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* running system has.
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*/
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if (self->code == ARCHIVE_COMPRESSION_XZ)
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ret = lzma_stream_decoder(&(state->stream),
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(1U << 23) + (1U << 21),/* memlimit */
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LZMA_CONCATENATED);
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else
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ret = lzma_alone_decoder(&(state->stream),
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(1U << 23) + (1U << 21));/* memlimit */
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if (ret == LZMA_OK)
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return (ARCHIVE_OK);
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/* Library setup failed: Choose an error message and clean up. */
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switch (ret) {
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case LZMA_MEM_ERROR:
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archive_set_error(&self->archive->archive, ENOMEM,
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"Internal error initializing compression library: "
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"Cannot allocate memory");
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break;
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case LZMA_OPTIONS_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library: "
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"Invalid or unsupported options");
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break;
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default:
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archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
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"Internal error initializing lzma library");
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break;
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}
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free(state->out_block);
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free(state);
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self->data = NULL;
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return (ARCHIVE_FATAL);
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}
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/*
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* Return the next block of decompressed data.
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*/
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static ssize_t
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xz_filter_read(struct archive_read_filter *self, const void **p)
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{
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struct private_data *state;
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size_t decompressed;
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ssize_t avail_in;
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int ret;
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state = (struct private_data *)self->data;
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/* Empty our output buffer. */
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state->stream.next_out = state->out_block;
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state->stream.avail_out = state->out_block_size;
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/* Try to fill the output buffer. */
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while (state->stream.avail_out > 0 && !state->eof) {
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state->stream.next_in =
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__archive_read_filter_ahead(self->upstream, 1, &avail_in);
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if (state->stream.next_in == NULL && avail_in < 0)
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return (ARCHIVE_FATAL);
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state->stream.avail_in = avail_in;
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/* Decompress as much as we can in one pass. */
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ret = lzma_code(&(state->stream),
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(state->stream.avail_in == 0)? LZMA_FINISH: LZMA_RUN);
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switch (ret) {
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case LZMA_STREAM_END: /* Found end of stream. */
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state->eof = 1;
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/* FALL THROUGH */
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case LZMA_OK: /* Decompressor made some progress. */
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__archive_read_filter_consume(self->upstream,
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avail_in - state->stream.avail_in);
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break;
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case LZMA_MEM_ERROR:
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archive_set_error(&self->archive->archive, ENOMEM,
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"Lzma library error: Cannot allocate memory");
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return (ARCHIVE_FATAL);
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case LZMA_MEMLIMIT_ERROR:
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archive_set_error(&self->archive->archive, ENOMEM,
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"Lzma library error: Out of memory");
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return (ARCHIVE_FATAL);
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case LZMA_FORMAT_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Lzma library error: format not recognized");
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return (ARCHIVE_FATAL);
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case LZMA_OPTIONS_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Lzma library error: Invalid options");
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return (ARCHIVE_FATAL);
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case LZMA_DATA_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Lzma library error: Corrupted input data");
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return (ARCHIVE_FATAL);
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case LZMA_BUF_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Lzma library error: No progress is possible");
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return (ARCHIVE_FATAL);
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default:
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/* Return an error. */
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Lzma decompression failed: Unknown error");
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return (ARCHIVE_FATAL);
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}
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}
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decompressed = state->stream.next_out - state->out_block;
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state->total_out += decompressed;
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if (decompressed == 0)
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*p = NULL;
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else
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*p = state->out_block;
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return (decompressed);
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}
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/*
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* Clean up the decompressor.
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*/
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static int
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xz_filter_close(struct archive_read_filter *self)
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{
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struct private_data *state;
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state = (struct private_data *)self->data;
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lzma_end(&(state->stream));
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free(state->out_block);
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free(state);
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return (ARCHIVE_OK);
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}
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#else
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#if HAVE_LZMADEC_H && HAVE_LIBLZMADEC
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/*
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* If we have the older liblzmadec library, then we can handle
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* LZMA streams but not XZ streams.
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*/
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/*
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* Setup the callbacks.
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*/
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static int
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lzma_bidder_init(struct archive_read_filter *self)
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{
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static const size_t out_block_size = 64 * 1024;
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void *out_block;
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struct private_data *state;
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ssize_t ret, avail_in;
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self->code = ARCHIVE_COMPRESSION_LZMA;
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self->name = "lzma";
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state = (struct private_data *)calloc(sizeof(*state), 1);
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out_block = (unsigned char *)malloc(out_block_size);
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if (state == NULL || out_block == NULL) {
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archive_set_error(&self->archive->archive, ENOMEM,
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"Can't allocate data for lzma decompression");
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free(out_block);
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free(state);
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return (ARCHIVE_FATAL);
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}
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self->data = state;
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state->out_block_size = out_block_size;
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state->out_block = out_block;
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self->read = lzma_filter_read;
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self->skip = NULL; /* not supported */
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self->close = lzma_filter_close;
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/* Prime the lzma library with 18 bytes of input. */
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state->stream.next_in = (unsigned char *)(uintptr_t)
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__archive_read_filter_ahead(self->upstream, 18, &avail_in);
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if (state->stream.next_in == NULL)
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return (ARCHIVE_FATAL);
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state->stream.avail_in = avail_in;
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state->stream.next_out = state->out_block;
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state->stream.avail_out = state->out_block_size;
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/* Initialize compression library. */
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ret = lzmadec_init(&(state->stream));
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__archive_read_filter_consume(self->upstream,
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avail_in - state->stream.avail_in);
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if (ret == LZMADEC_OK)
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return (ARCHIVE_OK);
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/* Library setup failed: Clean up. */
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archive_set_error(&self->archive->archive, ARCHIVE_ERRNO_MISC,
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"Internal error initializing lzma library");
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/* Override the error message if we know what really went wrong. */
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switch (ret) {
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case LZMADEC_HEADER_ERROR:
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archive_set_error(&self->archive->archive,
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ARCHIVE_ERRNO_MISC,
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"Internal error initializing compression library: "
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"invalid header");
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break;
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case LZMADEC_MEM_ERROR:
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archive_set_error(&self->archive->archive, ENOMEM,
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"Internal error initializing compression library: "
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"out of memory");
|
|
break;
|
|
}
|
|
|
|
free(state->out_block);
|
|
free(state);
|
|
self->data = NULL;
|
|
return (ARCHIVE_FATAL);
|
|
}
|
|
|
|
/*
|
|
* Return the next block of decompressed data.
|
|
*/
|
|
static ssize_t
|
|
lzma_filter_read(struct archive_read_filter *self, const void **p)
|
|
{
|
|
struct private_data *state;
|
|
size_t decompressed;
|
|
ssize_t avail_in, ret;
|
|
|
|
state = (struct private_data *)self->data;
|
|
|
|
/* Empty our output buffer. */
|
|
state->stream.next_out = state->out_block;
|
|
state->stream.avail_out = state->out_block_size;
|
|
|
|
/* Try to fill the output buffer. */
|
|
while (state->stream.avail_out > 0 && !state->eof) {
|
|
state->stream.next_in = (unsigned char *)(uintptr_t)
|
|
__archive_read_filter_ahead(self->upstream, 1, &avail_in);
|
|
if (state->stream.next_in == NULL && avail_in < 0)
|
|
return (ARCHIVE_FATAL);
|
|
state->stream.avail_in = avail_in;
|
|
|
|
/* Decompress as much as we can in one pass. */
|
|
ret = lzmadec_decode(&(state->stream), avail_in == 0);
|
|
switch (ret) {
|
|
case LZMADEC_STREAM_END: /* Found end of stream. */
|
|
state->eof = 1;
|
|
/* FALL THROUGH */
|
|
case LZMADEC_OK: /* Decompressor made some progress. */
|
|
__archive_read_filter_consume(self->upstream,
|
|
avail_in - state->stream.avail_in);
|
|
break;
|
|
case LZMADEC_BUF_ERROR: /* Insufficient input data? */
|
|
archive_set_error(&self->archive->archive,
|
|
ARCHIVE_ERRNO_MISC,
|
|
"Insufficient compressed data");
|
|
return (ARCHIVE_FATAL);
|
|
default:
|
|
/* Return an error. */
|
|
archive_set_error(&self->archive->archive,
|
|
ARCHIVE_ERRNO_MISC,
|
|
"Lzma decompression failed");
|
|
return (ARCHIVE_FATAL);
|
|
}
|
|
}
|
|
|
|
decompressed = state->stream.next_out - state->out_block;
|
|
state->total_out += decompressed;
|
|
if (decompressed == 0)
|
|
*p = NULL;
|
|
else
|
|
*p = state->out_block;
|
|
return (decompressed);
|
|
}
|
|
|
|
/*
|
|
* Clean up the decompressor.
|
|
*/
|
|
static int
|
|
lzma_filter_close(struct archive_read_filter *self)
|
|
{
|
|
struct private_data *state;
|
|
int ret;
|
|
|
|
state = (struct private_data *)self->data;
|
|
ret = ARCHIVE_OK;
|
|
switch (lzmadec_end(&(state->stream))) {
|
|
case LZMADEC_OK:
|
|
break;
|
|
default:
|
|
archive_set_error(&(self->archive->archive),
|
|
ARCHIVE_ERRNO_MISC,
|
|
"Failed to clean up %s compressor",
|
|
self->archive->archive.compression_name);
|
|
ret = ARCHIVE_FATAL;
|
|
}
|
|
|
|
free(state->out_block);
|
|
free(state);
|
|
return (ret);
|
|
}
|
|
|
|
#else
|
|
|
|
/*
|
|
*
|
|
* If we have no suitable library on this system, we can't actually do
|
|
* the decompression. We can, however, still detect compressed
|
|
* archives and emit a useful message.
|
|
*
|
|
*/
|
|
static int
|
|
lzma_bidder_init(struct archive_read_filter *self)
|
|
{
|
|
int r;
|
|
|
|
r = __archive_read_program(self, "unlzma");
|
|
/* Note: We set the format here even if __archive_read_program()
|
|
* above fails. We do, after all, know what the format is
|
|
* even if we weren't able to read it. */
|
|
self->code = ARCHIVE_COMPRESSION_LZMA;
|
|
self->name = "lzma";
|
|
return (r);
|
|
}
|
|
|
|
#endif /* HAVE_LZMADEC_H */
|
|
|
|
|
|
static int
|
|
xz_bidder_init(struct archive_read_filter *self)
|
|
{
|
|
int r;
|
|
|
|
r = __archive_read_program(self, "unxz");
|
|
/* Note: We set the format here even if __archive_read_program()
|
|
* above fails. We do, after all, know what the format is
|
|
* even if we weren't able to read it. */
|
|
self->code = ARCHIVE_COMPRESSION_XZ;
|
|
self->name = "xz";
|
|
return (r);
|
|
}
|
|
|
|
|
|
#endif /* HAVE_LZMA_H */
|