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feeb03b2c8
manual page as I wrote the unpack functionality. No actual executable code change verified with md5(1).
142 lines
4.0 KiB
C
142 lines
4.0 KiB
C
/* $NetBSD: unbzip2.c,v 1.13 2009/12/05 03:23:37 mrg Exp $ */
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/*-
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* Copyright (c) 2006 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 Simon Burge.
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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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* $FreeBSD$
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*/
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/* This file is #included by gzip.c */
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static off_t
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unbzip2(int in, int out, char *pre, size_t prelen, off_t *bytes_in)
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{
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int ret, end_of_file, cold = 0;
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off_t bytes_out = 0;
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bz_stream bzs;
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static char *inbuf, *outbuf;
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if (inbuf == NULL)
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inbuf = malloc(BUFLEN);
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if (outbuf == NULL)
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outbuf = malloc(BUFLEN);
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if (inbuf == NULL || outbuf == NULL)
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maybe_err("malloc");
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bzs.bzalloc = NULL;
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bzs.bzfree = NULL;
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bzs.opaque = NULL;
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end_of_file = 0;
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ret = BZ2_bzDecompressInit(&bzs, 0, 0);
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if (ret != BZ_OK)
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maybe_errx("bzip2 init");
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/* Prepend. */
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bzs.avail_in = prelen;
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bzs.next_in = pre;
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if (bytes_in)
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*bytes_in = prelen;
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while (ret == BZ_OK) {
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if (bzs.avail_in == 0 && !end_of_file) {
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ssize_t n;
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n = read(in, inbuf, BUFLEN);
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if (n < 0)
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maybe_err("read");
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if (n == 0)
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end_of_file = 1;
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bzs.next_in = inbuf;
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bzs.avail_in = n;
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if (bytes_in)
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*bytes_in += n;
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}
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bzs.next_out = outbuf;
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bzs.avail_out = BUFLEN;
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ret = BZ2_bzDecompress(&bzs);
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switch (ret) {
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case BZ_STREAM_END:
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case BZ_OK:
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if (ret == BZ_OK && end_of_file) {
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/*
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* If we hit this after a stream end, consider
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* it as the end of the whole file and don't
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* bail out.
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*/
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if (cold == 1)
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ret = BZ_STREAM_END;
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else
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maybe_errx("truncated file");
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}
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cold = 0;
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if (!tflag && bzs.avail_out != BUFLEN) {
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ssize_t n;
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n = write(out, outbuf, BUFLEN - bzs.avail_out);
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if (n < 0)
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maybe_err("write");
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bytes_out += n;
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}
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if (ret == BZ_STREAM_END && !end_of_file) {
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if (BZ2_bzDecompressEnd(&bzs) != BZ_OK ||
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BZ2_bzDecompressInit(&bzs, 0, 0) != BZ_OK)
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maybe_errx("bzip2 re-init");
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cold = 1;
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ret = BZ_OK;
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}
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break;
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case BZ_DATA_ERROR:
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maybe_warnx("bzip2 data integrity error");
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break;
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case BZ_DATA_ERROR_MAGIC:
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maybe_warnx("bzip2 magic number error");
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break;
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case BZ_MEM_ERROR:
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maybe_warnx("bzip2 out of memory");
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break;
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default:
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maybe_warnx("unknown bzip2 error: %d", ret);
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break;
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}
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}
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if (ret != BZ_STREAM_END || BZ2_bzDecompressEnd(&bzs) != BZ_OK)
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return (-1);
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return (bytes_out);
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}
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