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/*-
* Copyright (c) 2012 Michihiro NAKAJIMA
* 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 AUTHOR(S) ``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 AUTHOR(S) 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 "archive_platform.h"
__FBSDID("$FreeBSD$");
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include "archive.h"
#include "archive_private.h"
#include "archive_read_private.h"
static const unsigned char grzip_magic[] = {
0x47, 0x52, 0x5a, 0x69, 0x70, 0x49, 0x49, 0x00,
0x02, 0x04, 0x3a, 0x29 };
static int grzip_bidder_bid(struct archive_read_filter_bidder *,
struct archive_read_filter *);
static int grzip_bidder_init(struct archive_read_filter *);
static int
grzip_reader_free(struct archive_read_filter_bidder *self)
{
(void)self; /* UNUSED */
return (ARCHIVE_OK);
}
int
archive_read_support_filter_grzip(struct archive *_a)
{
struct archive_read *a = (struct archive_read *)_a;
struct archive_read_filter_bidder *reader;
archive_check_magic(_a, ARCHIVE_READ_MAGIC,
ARCHIVE_STATE_NEW, "archive_read_support_filter_grzip");
if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK)
return (ARCHIVE_FATAL);
reader->data = NULL;
reader->bid = grzip_bidder_bid;
reader->init = grzip_bidder_init;
reader->options = NULL;
reader->free = grzip_reader_free;
/* This filter always uses an external program. */
archive_set_error(_a, ARCHIVE_ERRNO_MISC,
"Using external grzip program for grzip decompression");
return (ARCHIVE_WARN);
}
/*
* Bidder just verifies the header and returns the number of verified bits.
*/
static int
grzip_bidder_bid(struct archive_read_filter_bidder *self,
struct archive_read_filter *filter)
{
const unsigned char *p;
ssize_t avail;
(void)self; /* UNUSED */
p = __archive_read_filter_ahead(filter, sizeof(grzip_magic), &avail);
if (p == NULL || avail == 0)
return (0);
if (memcmp(p, grzip_magic, sizeof(grzip_magic)))
return (0);
return (sizeof(grzip_magic) * 8);
}
static int
grzip_bidder_init(struct archive_read_filter *self)
{
int r;
r = __archive_read_program(self, "grzip -d");
/* 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_FILTER_GRZIP;
self->name = "grzip";
return (r);
}
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