122 lines
3.5 KiB
C
122 lines
3.5 KiB
C
/*-
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* Copyright (c) 2012 Michihiro NAKAJIMA
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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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#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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#include "archive.h"
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#include "archive_private.h"
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#include "archive_read_private.h"
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static const unsigned char grzip_magic[] = {
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0x47, 0x52, 0x5a, 0x69, 0x70, 0x49, 0x49, 0x00,
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0x02, 0x04, 0x3a, 0x29 };
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static int grzip_bidder_bid(struct archive_read_filter_bidder *,
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struct archive_read_filter *);
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static int grzip_bidder_init(struct archive_read_filter *);
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static int
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grzip_reader_free(struct archive_read_filter_bidder *self)
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{
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(void)self; /* UNUSED */
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return (ARCHIVE_OK);
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}
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int
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archive_read_support_filter_grzip(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 *reader;
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archive_check_magic(_a, ARCHIVE_READ_MAGIC,
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ARCHIVE_STATE_NEW, "archive_read_support_filter_grzip");
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if (__archive_read_get_bidder(a, &reader) != ARCHIVE_OK)
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return (ARCHIVE_FATAL);
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reader->data = NULL;
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reader->bid = grzip_bidder_bid;
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reader->init = grzip_bidder_init;
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reader->options = NULL;
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reader->free = grzip_reader_free;
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/* This filter always uses an external program. */
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archive_set_error(_a, ARCHIVE_ERRNO_MISC,
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"Using external grzip program for grzip decompression");
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return (ARCHIVE_WARN);
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}
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/*
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* Bidder just verifies the header and returns the number of verified bits.
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*/
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static int
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grzip_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 *p;
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ssize_t avail;
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(void)self; /* UNUSED */
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p = __archive_read_filter_ahead(filter, sizeof(grzip_magic), &avail);
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if (p == NULL || avail == 0)
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return (0);
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if (memcmp(p, grzip_magic, sizeof(grzip_magic)))
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return (0);
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return (sizeof(grzip_magic) * 8);
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}
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static int
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grzip_bidder_init(struct archive_read_filter *self)
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{
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int r;
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r = __archive_read_program(self, "grzip -d");
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/* Note: We set the format here even if __archive_read_program()
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* above fails. We do, after all, know what the format is
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* even if we weren't able to read it. */
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self->code = ARCHIVE_FILTER_GRZIP;
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self->name = "grzip";
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return (r);
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}
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