2 * Copyright (c) 2003-2007 Tim Kientzle
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
26 #include "archive_platform.h"
27 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_compression_none.c,v 1.14 2007/04/15 04:42:52 kientzle Exp $");
40 #include "archive_private.h"
41 #include "archive_write_private.h"
43 static int archive_compressor_none_finish(struct archive_write
*a
);
44 static int archive_compressor_none_init(struct archive_write
*);
45 static int archive_compressor_none_write(struct archive_write
*,
46 const void *, size_t);
51 char *next
; /* Current insert location */
52 ssize_t avail
; /* Free space left in buffer */
56 archive_write_set_compression_none(struct archive
*_a
)
58 struct archive_write
*a
= (struct archive_write
*)_a
;
59 __archive_check_magic(&a
->archive
, ARCHIVE_WRITE_MAGIC
,
60 ARCHIVE_STATE_NEW
, "archive_write_set_compression_none");
61 a
->compressor
.init
= &archive_compressor_none_init
;
69 archive_compressor_none_init(struct archive_write
*a
)
72 struct archive_none
*state
;
74 a
->archive
.compression_code
= ARCHIVE_COMPRESSION_NONE
;
75 a
->archive
.compression_name
= "none";
77 if (a
->client_opener
!= NULL
) {
78 ret
= (a
->client_opener
)(&a
->archive
, a
->client_data
);
83 state
= (struct archive_none
*)malloc(sizeof(*state
));
85 archive_set_error(&a
->archive
, ENOMEM
,
86 "Can't allocate data for output buffering");
87 return (ARCHIVE_FATAL
);
89 memset(state
, 0, sizeof(*state
));
91 state
->buffer_size
= a
->bytes_per_block
;
92 if (state
->buffer_size
!= 0) {
93 state
->buffer
= (char *)malloc(state
->buffer_size
);
94 if (state
->buffer
== NULL
) {
95 archive_set_error(&a
->archive
, ENOMEM
,
96 "Can't allocate output buffer");
98 return (ARCHIVE_FATAL
);
102 state
->next
= state
->buffer
;
103 state
->avail
= state
->buffer_size
;
105 a
->compressor
.data
= state
;
106 a
->compressor
.write
= archive_compressor_none_write
;
107 a
->compressor
.finish
= archive_compressor_none_finish
;
112 * Write data to the stream.
115 archive_compressor_none_write(struct archive_write
*a
, const void *vbuff
,
119 ssize_t remaining
, to_copy
;
120 ssize_t bytes_written
;
121 struct archive_none
*state
;
123 state
= (struct archive_none
*)a
->compressor
.data
;
124 buff
= (const char *)vbuff
;
125 if (a
->client_writer
== NULL
) {
126 archive_set_error(&a
->archive
, ARCHIVE_ERRNO_PROGRAMMER
,
127 "No write callback is registered? "
128 "This is probably an internal programming error.");
129 return (ARCHIVE_FATAL
);
135 * If there is no buffer for blocking, just pass the data
136 * straight through to the client write callback. In
137 * particular, this supports "no write delay" operation for
138 * special applications. Just set the block size to zero.
140 if (state
->buffer_size
== 0) {
141 while (remaining
> 0) {
142 bytes_written
= (a
->client_writer
)(&a
->archive
,
143 a
->client_data
, buff
, remaining
);
144 if (bytes_written
<= 0)
145 return (ARCHIVE_FATAL
);
146 a
->archive
.raw_position
+= bytes_written
;
147 remaining
-= bytes_written
;
148 buff
+= bytes_written
;
150 a
->archive
.file_position
+= length
;
154 while ((remaining
> 0) || (state
->avail
== 0)) {
156 * If we have a full output block, write it and reset the
159 if (state
->avail
== 0) {
160 bytes_written
= (a
->client_writer
)(&a
->archive
,
161 a
->client_data
, state
->buffer
, state
->buffer_size
);
162 if (bytes_written
<= 0)
163 return (ARCHIVE_FATAL
);
164 /* XXX TODO: if bytes_written < state->buffer_size */
165 a
->archive
.raw_position
+= bytes_written
;
166 state
->next
= state
->buffer
;
167 state
->avail
= state
->buffer_size
;
170 /* Now we have space in the buffer; copy new data into it. */
171 to_copy
= (remaining
> state
->avail
) ?
172 state
->avail
: remaining
;
173 memcpy(state
->next
, buff
, to_copy
);
174 state
->next
+= to_copy
;
175 state
->avail
-= to_copy
;
177 remaining
-= to_copy
;
179 a
->archive
.file_position
+= length
;
185 * Finish the compression.
188 archive_compressor_none_finish(struct archive_write
*a
)
190 ssize_t block_length
;
191 ssize_t target_block_length
;
192 ssize_t bytes_written
;
195 struct archive_none
*state
;
197 state
= (struct archive_none
*)a
->compressor
.data
;
198 ret
= ret2
= ARCHIVE_OK
;
199 if (a
->client_writer
== NULL
) {
200 archive_set_error(&a
->archive
, ARCHIVE_ERRNO_PROGRAMMER
,
201 "No write callback is registered? "
202 "This is probably an internal programming error.");
203 return (ARCHIVE_FATAL
);
206 /* If there's pending data, pad and write the last block */
207 if (state
->next
!= state
->buffer
) {
208 block_length
= state
->buffer_size
- state
->avail
;
210 /* Tricky calculation to determine size of last block */
211 target_block_length
= block_length
;
212 if (a
->bytes_in_last_block
<= 0)
213 /* Default or Zero: pad to full block */
214 target_block_length
= a
->bytes_per_block
;
216 /* Round to next multiple of bytes_in_last_block. */
217 target_block_length
= a
->bytes_in_last_block
*
218 ( (block_length
+ a
->bytes_in_last_block
- 1) /
219 a
->bytes_in_last_block
);
220 if (target_block_length
> a
->bytes_per_block
)
221 target_block_length
= a
->bytes_per_block
;
222 if (block_length
< target_block_length
) {
223 memset(state
->next
, 0,
224 target_block_length
- block_length
);
225 block_length
= target_block_length
;
227 bytes_written
= (a
->client_writer
)(&a
->archive
,
228 a
->client_data
, state
->buffer
, block_length
);
229 if (bytes_written
<= 0)
232 a
->archive
.raw_position
+= bytes_written
;
239 a
->compressor
.data
= NULL
;