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/* $NetBSD: decompress.c,v 1.3 2009/08/02 17:56:45 joerg Exp $ */
/*-
* Copyright (c) 2008 Joerg Sonnenberger <joerg@NetBSD.org>.
* All rights reserved.
*
* 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 COPYRIGHT HOLDERS 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
* COPYRIGHT HOLDERS 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.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <nbcompat.h>
#if HAVE_SYS_CDEFS_H
#include <sys/cdefs.h>
#endif
__RCSID("$NetBSD: decompress.c,v 1.3 2009/08/02 17:56:45 joerg Exp $");
#ifdef BOOTSTRAP
#include "lib.h"
int
decompress_buffer(const char *input, size_t input_len, char **output,
size_t *output_len)
{
return 0;
}
#else
#include <bzlib.h>
#if HAVE_ERR_H
#include <err.h>
#endif
#include <limits.h>
#include <stdlib.h>
#include <zlib.h>
#include "lib.h"
static void
decompress_bzip2(const char *in, size_t in_len, char **out, size_t *out_len)
{
bz_stream stream;
size_t output_produced;
if (in_len < SSIZE_MAX / 10)
*out_len = in_len * 10;
else
*out_len = in_len;
*out = xmalloc(*out_len + 1);
stream.next_in = __UNCONST(in);
stream.avail_in = in_len;
stream.next_out = *out;
stream.avail_out = *out_len;
output_produced = 0;
stream.bzalloc = NULL;
stream.bzfree = NULL;
stream.opaque = NULL;
if (BZ2_bzDecompressInit(&stream, 0, 0) != BZ_OK)
errx(EXIT_FAILURE, "BZ2_bzDecompressInit failed");
for (;;) {
switch (BZ2_bzDecompress(&stream)) {
case BZ_STREAM_END:
if (BZ2_bzDecompressEnd(&stream) != Z_OK)
errx(EXIT_FAILURE, "inflateEnd failed");
output_produced = *out_len - stream.avail_out;
*out = xrealloc(*out, output_produced + 1);
*out_len = output_produced;
(*out)[*out_len] = '\0';
return;
case BZ_OK:
output_produced = *out_len - stream.avail_out;
if (*out_len <= SSIZE_MAX / 2)
*out_len *= 2;
else
errx(EXIT_FAILURE, "input too large");
*out = xrealloc(*out, *out_len + 1);
stream.next_out = *out + output_produced;
stream.avail_out = *out_len - output_produced;
break;
default:
errx(EXIT_FAILURE, "inflate failed");
}
}
}
static void
decompress_zlib(const char *in, size_t in_len, char **out, size_t *out_len)
{
z_stream stream;
size_t output_produced;
if (in_len < SSIZE_MAX / 10)
*out_len = in_len * 10;
else
*out_len = in_len;
*out = xmalloc(*out_len + 1);
stream.next_in = __UNCONST(in);
stream.avail_in = in_len;
stream.next_out = (unsigned char *)*out;
stream.avail_out = *out_len;
output_produced = 0;
stream.zalloc = Z_NULL;
stream.zfree = Z_NULL;
stream.opaque = NULL;
if (inflateInit2(&stream, 47) != Z_OK)
errx(EXIT_FAILURE, "inflateInit failed");
for (;;) {
switch (inflate(&stream, Z_FINISH)) {
case Z_STREAM_END:
if (inflateEnd(&stream) != Z_OK)
errx(EXIT_FAILURE, "inflateEnd failed");
output_produced = *out_len - stream.avail_out;
*out = xrealloc(*out, output_produced + 1);
*out_len = output_produced;
(*out)[*out_len] = '\0';
return;
case Z_OK:
output_produced = *out_len - stream.avail_out;
if (*out_len < SSIZE_MAX / 2)
*out_len *= 2;
else if (*out_len == SSIZE_MAX - 1)
errx(EXIT_FAILURE, "input too large");
else
*out_len = SSIZE_MAX - 1;
*out = xrealloc(*out, *out_len + 1);
stream.next_out = (unsigned char *)*out + output_produced;
stream.avail_out = *out_len - output_produced;
break;
default:
errx(EXIT_FAILURE, "inflate failed");
}
}
}
int
decompress_buffer(const char *input, size_t input_len, char **output,
size_t *output_len)
{
if (input_len < 4)
return 0;
if (input[0] == 'B' && input[1] == 'Z' && input[2] == 'h' &&
input[3] >= '1' && input[3] <= '9') {
/* Normal bzip2. */
decompress_bzip2(input, input_len, output, output_len);
} else if (input[0] == 037 && (unsigned char)input[1] == 139 &&
input[2] == 8 && (input[3] & 0xe0) == 0) {
/* gzip header with Deflate method */
decompress_zlib(input, input_len, output, output_len);
} else /* plain text */
return 0;
return 1;
}
#endif /* BOOTSTRAP */
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