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Import libarchive-2.5.4b.
[dragonfly.git] / contrib / libarchive-2 / libarchive / archive_read_support_compression_program.c
blob206215c897cb0e5b0a24e4a7be8964f8b5ae93c5
1 /*-
2 * Copyright (c) 2007 Joerg Sonnenberger
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 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_compression_program.c,v 1.2 2007/07/20 01:28:50 kientzle Exp $");
28
29
30 /* This capability is only available on POSIX systems. */
31 #if !defined(HAVE_PIPE) || !defined(HAVE_VFORK) || !defined(HAVE_FCNTL)
32
33 /*
34 * On non-Posix systems, allow the program to build, but choke if
35 * this function is actually invoked.
36 */
37 int
38 archive_read_support_compression_program(struct archive *_a, const char *cmd)
39 {
40 archive_set_error(_a, -1,
41 "External compression programs not supported on this platform");
42 return (ARCHIVE_FATAL);
43 }
44
45 #else
46
47 #ifdef HAVE_SYS_WAIT_H
48 # include <sys/wait.h>
49 #endif
50 #ifdef HAVE_ERRNO_H
51 # include <errno.h>
52 #endif
53 #ifdef HAVE_FCNTL_H
54 # include <fcntl.h>
55 #endif
56 #ifdef HAVE_LIMITS_H
57 # include <limits.h>
58 #endif
59 #ifdef HAVE_STDLIB_H
60 # include <stdlib.h>
61 #endif
62 #ifdef HAVE_STRING_H
63 # include <string.h>
64 #endif
65 #ifdef HAVE_UNISTD_H
66 # include <unistd.h>
67 #endif
68
69 #include "archive.h"
70 #include "archive_private.h"
71 #include "archive_read_private.h"
72
73 #include "filter_fork.h"
74
75 struct archive_decompress_program {
76 char *description;
77 pid_t child;
78 int child_stdin, child_stdout;
79
80 char *child_out_buf;
81 char *child_out_buf_next;
82 size_t child_out_buf_len, child_out_buf_avail;
83
84 const char *child_in_buf;
85 size_t child_in_buf_avail;
86 };
87
88 static int archive_decompressor_program_bid(const void *, size_t);
89 static int archive_decompressor_program_finish(struct archive_read *);
90 static int archive_decompressor_program_init(struct archive_read *,
91 const void *, size_t);
92 static ssize_t archive_decompressor_program_read_ahead(struct archive_read *,
93 const void **, size_t);
94 static ssize_t archive_decompressor_program_read_consume(struct archive_read *,
95 size_t);
96
97 int
98 archive_read_support_compression_program(struct archive *_a, const char *cmd)
99 {
100 struct archive_read *a = (struct archive_read *)_a;
101 struct decompressor_t *decompressor;
102
103 if (cmd == NULL || *cmd == '\0')
104 return (ARCHIVE_WARN);
105
106 decompressor = __archive_read_register_compression(a,
107 archive_decompressor_program_bid,
108 archive_decompressor_program_init);
109 if (decompressor == NULL)
110 return (ARCHIVE_WARN);
111
112 decompressor->config = strdup(cmd);
113 return (ARCHIVE_OK);
114 }
115
116 /*
117 * If the user used us to register, they must really want us to
118 * handle it, so this module always bids INT_MAX.
119 */
120 static int
121 archive_decompressor_program_bid(const void *buff, size_t len)
122 {
123 (void)buff; /* UNUSED */
124 (void)len; /* UNUSED */
125
126 return (INT_MAX); /* Default: We'll take it. */
127 }
128
129 static ssize_t
130 child_read(struct archive_read *a, char *buf, size_t buf_len)
131 {
132 struct archive_decompress_program *state = a->decompressor->data;
133 ssize_t ret, requested;
134 const void *child_buf;
135
136 if (state->child_stdout == -1)
137 return (-1);
138
139 if (buf_len == 0)
140 return (-1);
141
142 restart_read:
143 requested = buf_len > SSIZE_MAX ? SSIZE_MAX : buf_len;
144
145 do {
146 ret = read(state->child_stdout, buf, requested);
147 } while (ret == -1 && errno == EINTR);
148
149 if (ret > 0)
150 return (ret);
151 if (ret == 0 || (ret == -1 && errno == EPIPE)) {
152 close(state->child_stdout);
153 state->child_stdout = -1;
154 return (0);
155 }
156 if (ret == -1 && errno != EAGAIN)
157 return (-1);
158
159 if (state->child_in_buf_avail == 0) {
160 child_buf = state->child_in_buf;
161 ret = (a->client_reader)(&a->archive,
162 a->client_data,&child_buf);
163 state->child_in_buf = (const char *)child_buf;
164
165 if (ret < 0) {
166 close(state->child_stdin);
167 state->child_stdin = -1;
168 fcntl(state->child_stdout, F_SETFL, 0);
169 return (-1);
170 }
171 if (ret == 0) {
172 close(state->child_stdin);
173 state->child_stdin = -1;
174 fcntl(state->child_stdout, F_SETFL, 0);
175 goto restart_read;
176 }
177 state->child_in_buf_avail = ret;
178 }
179
180 do {
181 ret = write(state->child_stdin, state->child_in_buf,
182 state->child_in_buf_avail);
183 } while (ret == -1 && errno == EINTR);
184
185 if (ret > 0) {
186 state->child_in_buf += ret;
187 state->child_in_buf_avail -= ret;
188 goto restart_read;
189 } else if (ret == -1 && errno == EAGAIN) {
190 __archive_check_child(state->child_stdin, state->child_stdout);
191 goto restart_read;
192 } else if (ret == 0 || (ret == -1 && errno == EPIPE)) {
193 close(state->child_stdin);
194 state->child_stdout = -1;
195 fcntl(state->child_stdout, F_SETFL, 0);
196 goto restart_read;
197 } else {
198 close(state->child_stdin);
199 state->child_stdin = -1;
200 fcntl(state->child_stdout, F_SETFL, 0);
201 return (-1);
202 }
203 }
204
205 static int
206 archive_decompressor_program_init(struct archive_read *a, const void *buff, size_t n)
207 {
208 struct archive_decompress_program *state;
209 const char *cmd = a->decompressor->config;
210 const char *prefix = "Program: ";
211
212
213 state = (struct archive_decompress_program *)malloc(sizeof(*state));
214 if (!state) {
215 archive_set_error(&a->archive, ENOMEM,
216 "Can't allocate input data");
217 return (ARCHIVE_FATAL);
218 }
219
220 a->archive.compression_code = ARCHIVE_COMPRESSION_PROGRAM;
221 state->description = (char *)malloc(strlen(prefix) + strlen(cmd) + 1);
222 strcpy(state->description, prefix);
223 strcat(state->description, cmd);
224 a->archive.compression_name = state->description;
225
226 state->child_out_buf_next = state->child_out_buf = malloc(65536);
227 if (!state->child_out_buf) {
228 free(state);
229 archive_set_error(&a->archive, ENOMEM,
230 "Can't allocate filter buffer");
231 return (ARCHIVE_FATAL);
232 }
233 state->child_out_buf_len = 65536;
234 state->child_out_buf_avail = 0;
235
236 state->child_in_buf = buff;
237 state->child_in_buf_avail = n;
238
239 if ((state->child = __archive_create_child(cmd,
240 &state->child_stdin, &state->child_stdout)) == -1) {
241 free(state->child_out_buf);
242 free(state);
243 archive_set_error(&a->archive, EINVAL,
244 "Can't initialise filter");
245 return (ARCHIVE_FATAL);
246 }
247
248 a->decompressor->data = state;
249 a->decompressor->read_ahead = archive_decompressor_program_read_ahead;
250 a->decompressor->consume = archive_decompressor_program_read_consume;
251 a->decompressor->skip = NULL;
252 a->decompressor->finish = archive_decompressor_program_finish;
253
254 /* XXX Check that we can read at least one byte? */
255 return (ARCHIVE_OK);
256 }
257
258 static ssize_t
259 archive_decompressor_program_read_ahead(struct archive_read *a, const void **buff,
260 size_t min)
261 {
262 struct archive_decompress_program *state;
263 ssize_t bytes_read;
264
265 state = (struct archive_decompress_program *)a->decompressor->data;
266
267 if (min > state->child_out_buf_len)
268 min = state->child_out_buf_len;
269
270 while (state->child_stdout != -1 && min > state->child_out_buf_avail) {
271 if (state->child_out_buf != state->child_out_buf_next) {
272 memmove(state->child_out_buf, state->child_out_buf_next,
273 state->child_out_buf_avail);
274 state->child_out_buf_next = state->child_out_buf;
275 }
276
277 bytes_read = child_read(a,
278 state->child_out_buf + state->child_out_buf_avail,
279 state->child_out_buf_len - state->child_out_buf_avail);
280 if (bytes_read == -1)
281 return (-1);
282 if (bytes_read == 0)
283 break;
284 state->child_out_buf_avail += bytes_read;
285 a->archive.raw_position += bytes_read;
286 }
287
288 *buff = state->child_out_buf_next;
289 return (state->child_out_buf_avail);
290 }
291
292 static ssize_t
293 archive_decompressor_program_read_consume(struct archive_read *a, size_t request)
294 {
295 struct archive_decompress_program *state;
296
297 state = (struct archive_decompress_program *)a->decompressor->data;
298
299 state->child_out_buf_next += request;
300 state->child_out_buf_avail -= request;
301
302 a->archive.file_position += request;
303 return (request);
304 }
305
306 static int
307 archive_decompressor_program_finish(struct archive_read *a)
308 {
309 struct archive_decompress_program *state;
310 int status;
311
312 state = (struct archive_decompress_program *)a->decompressor->data;
313
314 /* Release our configuration data. */
315 free(a->decompressor->config);
316 a->decompressor->config = NULL;
317
318 /* Shut down the child. */
319 if (state->child_stdin != -1)
320 close(state->child_stdin);
321 if (state->child_stdout != -1)
322 close(state->child_stdout);
323 while (waitpid(state->child, &status, 0) == -1 && errno == EINTR)
324 continue;
325
326 /* Release our private data. */
327 free(state->child_out_buf);
328 free(state->description);
329 free(state);
330 a->decompressor->data = NULL;
331
332 return (ARCHIVE_OK);
333 }
334
335 #endif /* !defined(HAVE_PIPE) || !defined(HAVE_VFORK) || !defined(HAVE_FCNTL) */
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