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More -Wwrite-strings cleanup and make sure you can actually play it.
[dragonfly.git] / contrib / libarchive / archive_write_set_format_ustar.c
blob1d314147796db981dbfe959bca81506c6434e068
1 /*-
2 * Copyright (c) 2003-2004 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 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include "archive_platform.h"
28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_write_set_format_ustar.c,v 1.12 2004/11/05 05:26:30 kientzle Exp $");
29
30 #include <sys/stat.h>
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35
36 #include "archive.h"
37 #include "archive_entry.h"
38 #include "archive_private.h"
39
40 struct ustar {
41 uint64_t entry_bytes_remaining;
42 uint64_t entry_padding;
43 char written;
44 };
45
46 /*
47 * Define structure of POSIX 'ustar' tar header.
48 */
49 struct archive_entry_header_ustar {
50 char name[100];
51 char mode[6];
52 char mode_padding[2];
53 char uid[6];
54 char uid_padding[2];
55 char gid[6];
56 char gid_padding[2];
57 char size[11];
58 char size_padding[1];
59 char mtime[11];
60 char mtime_padding[1];
61 char checksum[8];
62 char typeflag[1];
63 char linkname[100];
64 char magic[6]; /* For POSIX: "ustar\0" */
65 char version[2]; /* For POSIX: "00" */
66 char uname[32];
67 char gname[32];
68 char rdevmajor[6];
69 char rdevmajor_padding[2];
70 char rdevminor[6];
71 char rdevminor_padding[2];
72 char prefix[155];
73 char padding[12];
74 };
75
76 /*
77 * A filled-in copy of the header for initialization.
78 */
79 static const struct archive_entry_header_ustar template_header = {
80 { "" }, /* name */
81 { "000000" }, { ' ', '\0' }, /* mode, space-null termination. */
82 { "000000" }, { ' ', '\0' }, /* uid, space-null termination. */
83 { "000000" }, { ' ', '\0' }, /* gid, space-null termination. */
84 { "00000000000" }, { ' ' }, /* size, space termination. */
85 { "00000000000" }, { ' ' }, /* mtime, space termination. */
86 { " " }, /* Initial checksum value. */
87 { '0' }, /* default: regular file */
88 { "" }, /* linkname */
89 { "ustar" }, /* magic */
90 { '0', '0' }, /* version */
91 { "" }, /* uname */
92 { "" }, /* gname */
93 { "000000" }, { ' ', '\0' }, /* rdevmajor, space-null termination */
94 { "000000" }, { ' ', '\0' }, /* rdevminor, space-null termination */
95 { "" }, /* prefix */
96 { "" } /* padding */
97 };
98
99 static int archive_write_ustar_data(struct archive *a, const void *buff,
100 size_t s);
101 static int archive_write_ustar_finish(struct archive *);
102 static int archive_write_ustar_finish_entry(struct archive *);
103 static int archive_write_ustar_header(struct archive *,
104 struct archive_entry *entry);
105 static int format_256(int64_t, char *, int);
106 static int format_number(int64_t, char *, int size, int max, int strict);
107 static int format_octal(int64_t, char *, int);
108 static int write_nulls(struct archive *a, size_t);
109
110 /*
111 * Set output format to 'ustar' format.
112 */
113 int
114 archive_write_set_format_ustar(struct archive *a)
115 {
116 struct ustar *ustar;
117
118 /* If someone else was already registered, unregister them. */
119 if (a->format_finish != NULL)
120 (a->format_finish)(a);
121
122 ustar = malloc(sizeof(*ustar));
123 if (ustar == NULL) {
124 archive_set_error(a, ENOMEM, "Can't allocate ustar data");
125 return (ARCHIVE_FATAL);
126 }
127 memset(ustar, 0, sizeof(*ustar));
128 a->format_data = ustar;
129
130 a->pad_uncompressed = 1; /* Mimic gtar in this respect. */
131 a->format_write_header = archive_write_ustar_header;
132 a->format_write_data = archive_write_ustar_data;
133 a->format_finish = archive_write_ustar_finish;
134 a->format_finish_entry = archive_write_ustar_finish_entry;
135 a->archive_format = ARCHIVE_FORMAT_TAR_USTAR;
136 a->archive_format_name = "POSIX ustar";
137 return (ARCHIVE_OK);
138 }
139
140 static int
141 archive_write_ustar_header(struct archive *a, struct archive_entry *entry)
142 {
143 char buff[512];
144 int ret;
145 struct ustar *ustar;
146
147 ustar = a->format_data;
148 ustar->written = 1;
149
150 /* Only regular files (not hardlinks) have data. */
151 if (archive_entry_hardlink(entry) != NULL ||
152 archive_entry_symlink(entry) != NULL ||
153 !S_ISREG(archive_entry_mode(entry)))
154 archive_entry_set_size(entry, 0);
155
156 ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1);
157 if (ret != ARCHIVE_OK)
158 return (ret);
159 ret = (a->compression_write)(a, buff, 512);
160 if (ret != ARCHIVE_OK)
161 return (ret);
162
163 ustar->entry_bytes_remaining = archive_entry_size(entry);
164 ustar->entry_padding = 0x1ff & (- ustar->entry_bytes_remaining);
165 return (ARCHIVE_OK);
166 }
167
168 /*
169 * Format a basic 512-byte "ustar" header.
170 *
171 * Returns -1 if format failed (due to field overflow).
172 * Note that this always formats as much of the header as possible.
173 * If "strict" is set to zero, it will extend numeric fields as
174 * necessary (overwriting terminators or using base-256 extensions).
175 *
176 * This is exported so that other 'tar' formats can use it.
177 */
178 int
179 __archive_write_format_header_ustar(struct archive *a, char buff[512],
180 struct archive_entry *entry, int tartype, int strict)
181 {
182 unsigned int checksum;
183 struct archive_entry_header_ustar *h;
184 int i, ret;
185 size_t copy_length;
186 const char *p, *pp;
187 const struct stat *st;
188 int mytartype;
189
190 ret = 0;
191 mytartype = -1;
192 /*
193 * The "template header" already includes the "ustar"
194 * signature, various end-of-field markers and other required
195 * elements.
196 */
197 memcpy(buff, &template_header, 512);
198
199 h = (struct archive_entry_header_ustar *)buff;
200
201 /*
202 * Because the block is already null-filled, and strings
203 * are allowed to exactly fill their destination (without null),
204 * I use memcpy(dest, src, strlen()) here a lot to copy strings.
205 */
206
207 pp = archive_entry_pathname(entry);
208 if (strlen(pp) <= sizeof(h->name))
209 memcpy(h->name, pp, strlen(pp));
210 else {
211 /* Store in two pieces, splitting at a '/'. */
212 p = strchr(pp + strlen(pp) - sizeof(h->name) - 1, '/');
213 /*
214 * If there is no path separator, or the prefix or
215 * remaining name are too large, return an error.
216 */
217 if (!p) {
218 archive_set_error(a, ENAMETOOLONG,
219 "Pathname too long");
220 ret = ARCHIVE_WARN;
221 } else if (p > pp + sizeof(h->prefix)) {
222 archive_set_error(a, ENAMETOOLONG,
223 "Pathname too long");
224 ret = ARCHIVE_WARN;
225 } else {
226 /* Copy prefix and remainder to appropriate places */
227 memcpy(h->prefix, pp, p - pp);
228 memcpy(h->name, p + 1, pp + strlen(pp) - p - 1);
229 }
230 }
231
232 p = archive_entry_hardlink(entry);
233 if(p != NULL)
234 mytartype = '1';
235 else
236 p = archive_entry_symlink(entry);
237 if (p != NULL && p[0] != '\0') {
238 copy_length = strlen(p);
239 if (copy_length > sizeof(h->linkname)) {
240 archive_set_error(a, ENAMETOOLONG,
241 "Link contents too long");
242 ret = ARCHIVE_WARN;
243 copy_length = sizeof(h->linkname);
244 }
245 memcpy(h->linkname, p, copy_length);
246 }
247
248 p = archive_entry_uname(entry);
249 if (p != NULL && p[0] != '\0') {
250 copy_length = strlen(p);
251 if (copy_length > sizeof(h->uname)) {
252 archive_set_error(a, ARCHIVE_ERRNO_MISC,
253 "Username too long");
254 ret = ARCHIVE_WARN;
255 copy_length = sizeof(h->uname);
256 }
257 memcpy(h->uname, p, copy_length);
258 }
259
260 p = archive_entry_gname(entry);
261 if (p != NULL && p[0] != '\0') {
262 copy_length = strlen(p);
263 if (strlen(p) > sizeof(h->gname)) {
264 archive_set_error(a, ARCHIVE_ERRNO_MISC,
265 "Group name too long");
266 ret = ARCHIVE_WARN;
267 copy_length = sizeof(h->gname);
268 }
269 memcpy(h->gname, p, copy_length);
270 }
271
272 st = archive_entry_stat(entry);
273
274 if (format_number(st->st_mode & 07777, h->mode, sizeof(h->mode), 8, strict)) {
275 archive_set_error(a, ERANGE, "Numeric mode too large");
276 ret = ARCHIVE_WARN;
277 }
278
279 if (format_number(st->st_uid, h->uid, sizeof(h->uid), 8, strict)) {
280 archive_set_error(a, ERANGE, "Numeric user ID too large");
281 ret = ARCHIVE_WARN;
282 }
283
284 if (format_number(st->st_gid, h->gid, sizeof(h->gid), 8, strict)) {
285 archive_set_error(a, ERANGE, "Numeric group ID too large");
286 ret = ARCHIVE_WARN;
287 }
288
289 if (format_number(st->st_size, h->size, sizeof(h->size), 12, strict)) {
290 archive_set_error(a, ERANGE, "File size out of range");
291 ret = ARCHIVE_WARN;
292 }
293
294 if (format_number(st->st_mtime, h->mtime, sizeof(h->mtime), 12, strict)) {
295 archive_set_error(a, ERANGE,
296 "File modification time too large");
297 ret = ARCHIVE_WARN;
298 }
299
300 if (S_ISBLK(st->st_mode) || S_ISCHR(st->st_mode)) {
301 if (format_number(major(st->st_rdev), h->rdevmajor,
302 sizeof(h->rdevmajor), 8, strict)) {
303 archive_set_error(a, ERANGE,
304 "Major device number too large");
305 ret = ARCHIVE_WARN;
306 }
307
308 if (format_number(minor(st->st_rdev), h->rdevminor,
309 sizeof(h->rdevminor), 8, strict)) {
310 archive_set_error(a, ERANGE,
311 "Minor device number too large");
312 ret = ARCHIVE_WARN;
313 }
314 }
315
316 if (tartype >= 0) {
317 h->typeflag[0] = tartype;
318 } else if (mytartype >= 0) {
319 h->typeflag[0] = mytartype;
320 } else {
321 switch (st->st_mode & S_IFMT) {
322 case S_IFREG: h->typeflag[0] = '0' ; break;
323 case S_IFLNK: h->typeflag[0] = '2' ; break;
324 case S_IFCHR: h->typeflag[0] = '3' ; break;
325 case S_IFBLK: h->typeflag[0] = '4' ; break;
326 case S_IFDIR: h->typeflag[0] = '5' ; break;
327 case S_IFIFO: h->typeflag[0] = '6' ; break;
328 case S_IFSOCK:
329 archive_set_error(a, ARCHIVE_ERRNO_FILE_FORMAT,
330 "tar format cannot archive socket");
331 ret = ARCHIVE_WARN;
332 break;
333 default:
334 archive_set_error(a, ARCHIVE_ERRNO_FILE_FORMAT,
335 "tar format cannot archive this (mode=0%lo)",
336 (unsigned long)st->st_mode);
337 ret = ARCHIVE_WARN;
338 }
339 }
340
341 checksum = 0;
342 for (i = 0; i < 512; i++)
343 checksum += 255 & (unsigned int)buff[i];
344 h->checksum[6] = '\0'; /* Can't be pre-set in the template. */
345 /* h->checksum[7] = ' '; */ /* This is pre-set in the template. */
346 format_octal(checksum, h->checksum, 6);
347 return (ret);
348 }
349
350 /*
351 * Format a number into a field, with some intelligence.
352 */
353 static int
354 format_number(int64_t v, char *p, int s, int maxsize, int strict)
355 {
356 int64_t limit;
357
358 limit = ((int64_t)1 << (s*3));
359
360 /* "Strict" only permits octal values with proper termination. */
361 if (strict)
362 return (format_octal(v, p, s));
363
364 /*
365 * In non-strict mode, we allow the number to overwrite one or
366 * more bytes of the field termination. Even old tar
367 * implementations should be able to handle this with no
368 * problem.
369 */
370 if (v >= 0) {
371 while (s <= maxsize) {
372 if (v < limit)
373 return (format_octal(v, p, s));
374 s++;
375 limit <<= 3;
376 }
377 }
378
379 /* Base-256 can handle any number, positive or negative. */
380 return (format_256(v, p, maxsize));
381 }
382
383 /*
384 * Format a number into the specified field using base-256.
385 */
386 static int
387 format_256(int64_t v, char *p, int s)
388 {
389 p += s;
390 while (s-- > 0) {
391 *--p = (char)(v & 0xff);
392 v >>= 8;
393 }
394 *p |= 0x80; /* Set the base-256 marker bit. */
395 return (0);
396 }
397
398 /*
399 * Format a number into the specified field.
400 */
401 static int
402 format_octal(int64_t v, char *p, int s)
403 {
404 int len;
405
406 len = s;
407
408 /* Octal values can't be negative, so use 0. */
409 if (v < 0) {
410 while (len-- > 0)
411 *p++ = '0';
412 return (-1);
413 }
414
415 p += s; /* Start at the end and work backwards. */
416 while (s-- > 0) {
417 *--p = '0' + (v & 7);
418 v >>= 3;
419 }
420
421 if (v == 0)
422 return (0);
423
424 /* If it overflowed, fill field with max value. */
425 while (len-- > 0)
426 *p++ = '7';
427
428 return (-1);
429 }
430
431 static int
432 archive_write_ustar_finish(struct archive *a)
433 {
434 struct ustar *ustar;
435 int r;
436
437 r = ARCHIVE_OK;
438 ustar = a->format_data;
439 /*
440 * Suppress end-of-archive if nothing else was ever written.
441 * This fixes a problem where setting one format, then another
442 * ends up writing a gratuitous end-of-archive marker.
443 */
444 if (ustar->written && a->compression_write != NULL)
445 r = write_nulls(a, 512*2);
446 free(ustar);
447 a->format_data = NULL;
448 return (r);
449 }
450
451 static int
452 archive_write_ustar_finish_entry(struct archive *a)
453 {
454 struct ustar *ustar;
455 int ret;
456
457 ustar = a->format_data;
458 ret = write_nulls(a,
459 ustar->entry_bytes_remaining + ustar->entry_padding);
460 ustar->entry_bytes_remaining = ustar->entry_padding = 0;
461 return (ret);
462 }
463
464 static int
465 write_nulls(struct archive *a, size_t padding)
466 {
467 int ret, to_write;
468
469 while (padding > 0) {
470 to_write = padding < a->null_length ? padding : a->null_length;
471 ret = (a->compression_write)(a, a->nulls, to_write);
472 if (ret != ARCHIVE_OK)
473 return (ret);
474 padding -= to_write;
475 }
476 return (ARCHIVE_OK);
477 }
478
479 static int
480 archive_write_ustar_data(struct archive *a, const void *buff, size_t s)
481 {
482 struct ustar *ustar;
483 int ret;
484
485 ustar = a->format_data;
486 if (s > ustar->entry_bytes_remaining)
487 s = ustar->entry_bytes_remaining;
488 ret = (a->compression_write)(a, buff, s);
489 ustar->entry_bytes_remaining -= s;
490 return (ret);
491 }
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