archive_write_add_filter_grzip.c revision 248616 
1/*-
2 * Copyright (c) 2003-2007 Tim Kientzle
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "archive_platform.h"
27
28__FBSDID("$FreeBSD$");
29
30#ifdef HAVE_ERRNO_H
31#include <errno.h>
32#endif
33#ifdef HAVE_STDLIB_H
34#include <stdlib.h>
35#endif
36
37#include "archive.h"
38#include "archive_write_private.h"
39
40struct write_grzip {
41	struct archive_write_program_data *pdata;
42};
43
44static int archive_write_grzip_open(struct archive_write_filter *);
45static int archive_write_grzip_options(struct archive_write_filter *,
46		    const char *, const char *);
47static int archive_write_grzip_write(struct archive_write_filter *,
48		    const void *, size_t);
49static int archive_write_grzip_close(struct archive_write_filter *);
50static int archive_write_grzip_free(struct archive_write_filter *);
51
52int
53archive_write_add_filter_grzip(struct archive *_a)
54{
55	struct archive_write_filter *f = __archive_write_allocate_filter(_a);
56	struct write_grzip *data;
57
58	archive_check_magic(_a, ARCHIVE_WRITE_MAGIC,
59	    ARCHIVE_STATE_NEW, "archive_write_add_filter_grzip");
60
61	data = calloc(1, sizeof(*data));
62	if (data == NULL) {
63		archive_set_error(_a, ENOMEM, "Can't allocate memory");
64		return (ARCHIVE_FATAL);
65	}
66	data->pdata = __archive_write_program_allocate();
67	if (data->pdata == NULL) {
68		free(data);
69		archive_set_error(_a, ENOMEM, "Can't allocate memory");
70		return (ARCHIVE_FATAL);
71	}
72
73	f->name = "grzip";
74	f->code = ARCHIVE_FILTER_GRZIP;
75	f->data = data;
76	f->open = archive_write_grzip_open;
77	f->options = archive_write_grzip_options;
78	f->write = archive_write_grzip_write;
79	f->close = archive_write_grzip_close;
80	f->free = archive_write_grzip_free;
81
82	/* Note: This filter always uses an external program, so we
83	 * return "warn" to inform of the fact. */
84	archive_set_error(_a, ARCHIVE_ERRNO_MISC,
85	    "Using external grzip program for grzip compression");
86	return (ARCHIVE_WARN);
87}
88
89static int
90archive_write_grzip_options(struct archive_write_filter *f, const char *key,
91    const char *value)
92{
93	(void)f; /* UNUSED */
94	(void)key; /* UNUSED */
95	(void)value; /* UNUSED */
96	/* Note: The "warn" return is just to inform the options
97	 * supervisor that we didn't handle it.  It will generate
98	 * a suitable error if no one used this option. */
99	return (ARCHIVE_WARN);
100}
101
102static int
103archive_write_grzip_open(struct archive_write_filter *f)
104{
105	struct write_grzip *data = (struct write_grzip *)f->data;
106
107	return __archive_write_program_open(f, data->pdata, "grzip");
108}
109
110static int
111archive_write_grzip_write(struct archive_write_filter *f,
112    const void *buff, size_t length)
113{
114	struct write_grzip *data = (struct write_grzip *)f->data;
115
116	return __archive_write_program_write(f, data->pdata, buff, length);
117}
118
119static int
120archive_write_grzip_close(struct archive_write_filter *f)
121{
122	struct write_grzip *data = (struct write_grzip *)f->data;
123
124	return __archive_write_program_close(f, data->pdata);
125}
126
127static int
128archive_write_grzip_free(struct archive_write_filter *f)
129{
130	struct write_grzip *data = (struct write_grzip *)f->data;
131
132	__archive_write_program_free(data->pdata);
133	free(data);
134	return (ARCHIVE_OK);
135}
136