summaryrefslogtreecommitdiffstats
path: root/lib/libarchive/archive_write_set_compression_none.c
blob: 99347b04fdf5e890976c3f6899eb152decd954c8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/*-
 * Copyright (c) 2003-2004 Tim Kientzle
 * 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
 *    in this position and unchanged.
 * 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("$FreeBSD$");

#include <errno.h>
#include <stdlib.h>
#include <string.h>

#include "archive.h"
#include "archive_private.h"

static int	archive_compressor_none_finish(struct archive *a);
static int	archive_compressor_none_init(struct archive *);
static ssize_t	archive_compressor_none_write(struct archive *, const void *,
		    size_t);

struct archive_none {
	char	*buffer;
	ssize_t	 buffer_size;
	char	*next;		/* Current insert location */
	ssize_t	 avail;		/* Free space left in buffer */
};

int
archive_write_set_compression_none(struct archive *a)
{
	archive_check_magic(a, ARCHIVE_WRITE_MAGIC, ARCHIVE_STATE_NEW);
	a->compression_init = &archive_compressor_none_init;
	a->compression_code = ARCHIVE_COMPRESSION_NONE;
	a->compression_name = "none";
	return (0);
}

/*
 * Setup callback.
 */
static int
archive_compressor_none_init(struct archive *a)
{
	int ret;
	struct archive_none *state;

	a->compression_code = ARCHIVE_COMPRESSION_NONE;
	a->compression_name = "none";

	if (a->client_opener != NULL) {
		ret = (a->client_opener)(a, a->client_data);
		if (ret != 0)
			return (ret);
	}

	state = (struct archive_none *)malloc(sizeof(*state));
	if (state == NULL) {
		archive_set_error(a, ENOMEM,
		    "Can't allocate data for output buffering");
		return (ARCHIVE_FATAL);
	}
	memset(state, 0, sizeof(*state));

	state->buffer_size = a->bytes_per_block;
	state->buffer = malloc(state->buffer_size);

	if (state->buffer == NULL) {
		archive_set_error(a, ENOMEM,
		    "Can't allocate output buffer");
		free(state);
		return (ARCHIVE_FATAL);
	}

	state->next = state->buffer;
	state->avail = state->buffer_size;

	a->compression_data = state;
	a->compression_write = archive_compressor_none_write;
	a->compression_finish = archive_compressor_none_finish;
	return (ARCHIVE_OK);
}

/*
 * Write data to the stream.
 */
static ssize_t
archive_compressor_none_write(struct archive *a, const void *vbuff,
    size_t length)
{
	const char *buff;
	ssize_t remaining, to_copy;
	int ret;
	struct archive_none *state;

	state = a->compression_data;
	buff = vbuff;
	if (a->client_writer == NULL) {
		archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
		    "No write callback is registered?  "
		    "This is probably an internal programming error.");
		return (ARCHIVE_FATAL);
	}

	remaining = length;
	while (remaining > 0) {
		/*
		 * If we have a full output block, write it and reset the
		 * output buffer.
		 */
		if (state->avail == 0) {
			ret = (a->client_writer)(a, a->client_data,
			    state->buffer, state->buffer_size);
			/* XXX TODO: if ret < state->buffer_size XXX */
			a->raw_position += ret;
			state->next = state->buffer;
			state->avail = state->buffer_size;
		}

		/* Now we have space in the buffer; copy new data into it. */
		to_copy = (remaining > state->avail) ?
		    state->avail : remaining;
		memcpy(state->next, buff, to_copy);
		state->next += to_copy;
		state->avail -= to_copy;
		buff += to_copy;
		remaining -= to_copy;
	}
	a->file_position += length;
	return (length);
}


/*
 * Finish the compression.
 */
static int
archive_compressor_none_finish(struct archive *a)
{
	ssize_t block_length;
	ssize_t target_block_length;
	int ret;
	int ret2;
	struct archive_none *state;

	state = a->compression_data;
	ret = ret2 = ARCHIVE_OK;
	if (a->client_writer == NULL) {
		archive_set_error(a, ARCHIVE_ERRNO_PROGRAMMER,
		    "No write callback is registered?  "
		    "This is probably an internal programming error.");
		return (ARCHIVE_FATAL);
	}

	/* If there's pending data, pad and write the last block */
	if (state->next != state->buffer) {
		block_length = state->buffer_size - state->avail;

		/* Tricky calculation to determine size of last block */
		target_block_length = block_length;
		if (a->bytes_in_last_block <= 0)
			/* Default or Zero: pad to full block */
			target_block_length = a->bytes_per_block;
		else
			/* Round to next multiple of bytes_in_last_block. */
			target_block_length = a->bytes_in_last_block *
			    ( (block_length + a->bytes_in_last_block - 1) /
				a->bytes_in_last_block);
		if (target_block_length > a->bytes_per_block)
			target_block_length = a->bytes_per_block;
		if (block_length < target_block_length) {
			memset(state->next, 0,
			    target_block_length - block_length);
			block_length = target_block_length;
		}
		ret = (a->client_writer)(a, a->client_data, state->buffer,
		    block_length);
	}

	/* Close the output */
	if (a->client_closer != NULL)
		ret2 = (a->client_closer)(a, a->client_data);

	free(state->buffer);
	free(state);
	a->compression_data = NULL;

	return (ret != ARCHIVE_OK ? ret : ret2);
}
OpenPOWER on IntegriCloud