1 /*- 2 * Copyright (c) 2003-2007 Tim Kientzle 3 * Copyright (c) 2011 Michihiro NAKAJIMA 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 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: head/lib/libarchive/archive_write_set_format_ustar.c 191579 2009-04-27 18:35:03Z kientzle $"); 29 30 31 #ifdef HAVE_ERRNO_H 32 #include <errno.h> 33 #endif 34 #include <stdio.h> 35 #ifdef HAVE_STDLIB_H 36 #include <stdlib.h> 37 #endif 38 #ifdef HAVE_STRING_H 39 #include <string.h> 40 #endif 41 42 #include "archive.h" 43 #include "archive_entry.h" 44 #include "archive_entry_locale.h" 45 #include "archive_private.h" 46 #include "archive_write_private.h" 47 48 struct ustar { 49 uint64_t entry_bytes_remaining; 50 uint64_t entry_padding; 51 52 struct archive_string_conv *opt_sconv; 53 struct archive_string_conv *sconv_default; 54 int init_default_conversion; 55 }; 56 57 /* 58 * Define structure of POSIX 'ustar' tar header. 59 */ 60 #define USTAR_name_offset 0 61 #define USTAR_name_size 100 62 #define USTAR_mode_offset 100 63 #define USTAR_mode_size 6 64 #define USTAR_mode_max_size 8 65 #define USTAR_uid_offset 108 66 #define USTAR_uid_size 6 67 #define USTAR_uid_max_size 8 68 #define USTAR_gid_offset 116 69 #define USTAR_gid_size 6 70 #define USTAR_gid_max_size 8 71 #define USTAR_size_offset 124 72 #define USTAR_size_size 11 73 #define USTAR_size_max_size 12 74 #define USTAR_mtime_offset 136 75 #define USTAR_mtime_size 11 76 #define USTAR_mtime_max_size 11 77 #define USTAR_checksum_offset 148 78 #define USTAR_checksum_size 8 79 #define USTAR_typeflag_offset 156 80 #define USTAR_typeflag_size 1 81 #define USTAR_linkname_offset 157 82 #define USTAR_linkname_size 100 83 #define USTAR_magic_offset 257 84 #define USTAR_magic_size 6 85 #define USTAR_version_offset 263 86 #define USTAR_version_size 2 87 #define USTAR_uname_offset 265 88 #define USTAR_uname_size 32 89 #define USTAR_gname_offset 297 90 #define USTAR_gname_size 32 91 #define USTAR_rdevmajor_offset 329 92 #define USTAR_rdevmajor_size 6 93 #define USTAR_rdevmajor_max_size 8 94 #define USTAR_rdevminor_offset 337 95 #define USTAR_rdevminor_size 6 96 #define USTAR_rdevminor_max_size 8 97 #define USTAR_prefix_offset 345 98 #define USTAR_prefix_size 155 99 #define USTAR_padding_offset 500 100 #define USTAR_padding_size 12 101 102 /* 103 * A filled-in copy of the header for initialization. 104 */ 105 static const char template_header[] = { 106 /* name: 100 bytes */ 107 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 108 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 109 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 110 0,0,0,0, 111 /* Mode, space-null termination: 8 bytes */ 112 '0','0','0','0','0','0', ' ','\0', 113 /* uid, space-null termination: 8 bytes */ 114 '0','0','0','0','0','0', ' ','\0', 115 /* gid, space-null termination: 8 bytes */ 116 '0','0','0','0','0','0', ' ','\0', 117 /* size, space termation: 12 bytes */ 118 '0','0','0','0','0','0','0','0','0','0','0', ' ', 119 /* mtime, space termation: 12 bytes */ 120 '0','0','0','0','0','0','0','0','0','0','0', ' ', 121 /* Initial checksum value: 8 spaces */ 122 ' ',' ',' ',' ',' ',' ',' ',' ', 123 /* Typeflag: 1 byte */ 124 '0', /* '0' = regular file */ 125 /* Linkname: 100 bytes */ 126 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 127 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 128 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 129 0,0,0,0, 130 /* Magic: 6 bytes, Version: 2 bytes */ 131 'u','s','t','a','r','\0', '0','0', 132 /* Uname: 32 bytes */ 133 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 134 /* Gname: 32 bytes */ 135 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 136 /* rdevmajor + space/null padding: 8 bytes */ 137 '0','0','0','0','0','0', ' ','\0', 138 /* rdevminor + space/null padding: 8 bytes */ 139 '0','0','0','0','0','0', ' ','\0', 140 /* Prefix: 155 bytes */ 141 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 142 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 143 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 144 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 145 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0, 0,0,0, 146 /* Padding: 12 bytes */ 147 0,0,0,0,0,0,0,0, 0,0,0,0 148 }; 149 150 static ssize_t archive_write_ustar_data(struct archive_write *a, const void *buff, 151 size_t s); 152 static int archive_write_ustar_free(struct archive_write *); 153 static int archive_write_ustar_close(struct archive_write *); 154 static int archive_write_ustar_finish_entry(struct archive_write *); 155 static int archive_write_ustar_header(struct archive_write *, 156 struct archive_entry *entry); 157 static int archive_write_ustar_options(struct archive_write *, 158 const char *, const char *); 159 static int format_256(int64_t, char *, int); 160 static int format_number(int64_t, char *, int size, int max, int strict); 161 static int format_octal(int64_t, char *, int); 162 163 /* 164 * Set output format to 'ustar' format. 165 */ 166 int 167 archive_write_set_format_ustar(struct archive *_a) 168 { 169 struct archive_write *a = (struct archive_write *)_a; 170 struct ustar *ustar; 171 172 archive_check_magic(_a, ARCHIVE_WRITE_MAGIC, 173 ARCHIVE_STATE_NEW, "archive_write_set_format_ustar"); 174 175 /* If someone else was already registered, unregister them. */ 176 if (a->format_free != NULL) 177 (a->format_free)(a); 178 179 /* Basic internal sanity test. */ 180 if (sizeof(template_header) != 512) { 181 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 182 "Internal: template_header wrong size: %zu should be 512", 183 sizeof(template_header)); 184 return (ARCHIVE_FATAL); 185 } 186 187 ustar = (struct ustar *)malloc(sizeof(*ustar)); 188 if (ustar == NULL) { 189 archive_set_error(&a->archive, ENOMEM, 190 "Can't allocate ustar data"); 191 return (ARCHIVE_FATAL); 192 } 193 memset(ustar, 0, sizeof(*ustar)); 194 a->format_data = ustar; 195 a->format_name = "ustar"; 196 a->format_options = archive_write_ustar_options; 197 a->format_write_header = archive_write_ustar_header; 198 a->format_write_data = archive_write_ustar_data; 199 a->format_close = archive_write_ustar_close; 200 a->format_free = archive_write_ustar_free; 201 a->format_finish_entry = archive_write_ustar_finish_entry; 202 a->archive.archive_format = ARCHIVE_FORMAT_TAR_USTAR; 203 a->archive.archive_format_name = "POSIX ustar"; 204 return (ARCHIVE_OK); 205 } 206 207 static int 208 archive_write_ustar_options(struct archive_write *a, const char *key, 209 const char *val) 210 { 211 struct ustar *ustar = (struct ustar *)a->format_data; 212 int ret = ARCHIVE_FAILED; 213 214 if (strcmp(key, "hdrcharset") == 0) { 215 if (val == NULL || val[0] == 0) 216 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 217 "%s: hdrcharset option needs a character-set name", 218 a->format_name); 219 else { 220 ustar->opt_sconv = archive_string_conversion_to_charset( 221 &a->archive, val, 0); 222 if (ustar->opt_sconv != NULL) 223 ret = ARCHIVE_OK; 224 else 225 ret = ARCHIVE_FATAL; 226 } 227 } else 228 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 229 "%s: unknown keyword ``%s''", a->format_name, key); 230 231 return (ret); 232 } 233 234 static int 235 archive_write_ustar_header(struct archive_write *a, struct archive_entry *entry) 236 { 237 char buff[512]; 238 int ret, ret2; 239 struct ustar *ustar; 240 struct archive_string_conv *sconv; 241 242 ustar = (struct ustar *)a->format_data; 243 244 /* Setup default string conversion. */ 245 if (ustar->opt_sconv == NULL) { 246 if (!ustar->init_default_conversion) { 247 ustar->sconv_default = 248 archive_string_default_conversion_for_write(&(a->archive)); 249 ustar->init_default_conversion = 1; 250 } 251 sconv = ustar->sconv_default; 252 } else 253 sconv = ustar->opt_sconv; 254 255 /* Sanity check. */ 256 if (archive_entry_pathname(entry) == NULL) { 257 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 258 "Can't record entry in tar file without pathname"); 259 return (ARCHIVE_FAILED); 260 } 261 262 /* Only regular files (not hardlinks) have data. */ 263 if (archive_entry_hardlink(entry) != NULL || 264 archive_entry_symlink(entry) != NULL || 265 !(archive_entry_filetype(entry) == AE_IFREG)) 266 archive_entry_set_size(entry, 0); 267 268 if (AE_IFDIR == archive_entry_filetype(entry)) { 269 const char *p; 270 char *t; 271 /* 272 * Ensure a trailing '/'. Modify the entry so 273 * the client sees the change. 274 */ 275 p = archive_entry_pathname(entry); 276 if (p[strlen(p) - 1] != '/') { 277 t = (char *)malloc(strlen(p) + 2); 278 if (t == NULL) { 279 archive_set_error(&a->archive, ENOMEM, 280 "Can't allocate ustar data"); 281 return(ARCHIVE_FATAL); 282 } 283 strcpy(t, p); 284 strcat(t, "/"); 285 archive_entry_copy_pathname(entry, t); 286 free(t); 287 } 288 } 289 290 ret = __archive_write_format_header_ustar(a, buff, entry, -1, 1, sconv); 291 if (ret < ARCHIVE_WARN) 292 return (ret); 293 ret2 = __archive_write_output(a, buff, 512); 294 if (ret2 < ARCHIVE_WARN) 295 return (ret2); 296 if (ret2 < ret) 297 ret = ret2; 298 299 ustar->entry_bytes_remaining = archive_entry_size(entry); 300 ustar->entry_padding = 0x1ff & (-(int64_t)ustar->entry_bytes_remaining); 301 return (ret); 302 } 303 304 /* 305 * Format a basic 512-byte "ustar" header. 306 * 307 * Returns -1 if format failed (due to field overflow). 308 * Note that this always formats as much of the header as possible. 309 * If "strict" is set to zero, it will extend numeric fields as 310 * necessary (overwriting terminators or using base-256 extensions). 311 * 312 * This is exported so that other 'tar' formats can use it. 313 */ 314 int 315 __archive_write_format_header_ustar(struct archive_write *a, char h[512], 316 struct archive_entry *entry, int tartype, int strict, 317 struct archive_string_conv *sconv) 318 { 319 unsigned int checksum; 320 int i, r, ret; 321 size_t copy_length; 322 const char *p, *pp; 323 int mytartype; 324 325 ret = 0; 326 mytartype = -1; 327 /* 328 * The "template header" already includes the "ustar" 329 * signature, various end-of-field markers and other required 330 * elements. 331 */ 332 memcpy(h, &template_header, 512); 333 334 /* 335 * Because the block is already null-filled, and strings 336 * are allowed to exactly fill their destination (without null), 337 * I use memcpy(dest, src, strlen()) here a lot to copy strings. 338 */ 339 r = archive_entry_pathname_l(entry, &pp, ©_length, sconv); 340 if (r != 0) { 341 if (errno == ENOMEM) { 342 archive_set_error(&a->archive, ENOMEM, 343 "Can't allocate memory for Pathname"); 344 return (ARCHIVE_FATAL); 345 } 346 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 347 "Can't translate pathname '%s' to %s", 348 pp, archive_string_conversion_charset_name(sconv)); 349 ret = ARCHIVE_WARN; 350 } 351 if (copy_length <= USTAR_name_size) 352 memcpy(h + USTAR_name_offset, pp, copy_length); 353 else { 354 /* Store in two pieces, splitting at a '/'. */ 355 p = strchr(pp + copy_length - USTAR_name_size - 1, '/'); 356 /* 357 * Look for the next '/' if we chose the first character 358 * as the separator. (ustar format doesn't permit 359 * an empty prefix.) 360 */ 361 if (p == pp) 362 p = strchr(p + 1, '/'); 363 /* Fail if the name won't fit. */ 364 if (!p) { 365 /* No separator. */ 366 archive_set_error(&a->archive, ENAMETOOLONG, 367 "Pathname too long"); 368 ret = ARCHIVE_FAILED; 369 } else if (p[1] == '\0') { 370 /* 371 * The only feasible separator is a final '/'; 372 * this would result in a non-empty prefix and 373 * an empty name, which POSIX doesn't 374 * explicitly forbid, but it just feels wrong. 375 */ 376 archive_set_error(&a->archive, ENAMETOOLONG, 377 "Pathname too long"); 378 ret = ARCHIVE_FAILED; 379 } else if (p > pp + USTAR_prefix_size) { 380 /* Prefix is too long. */ 381 archive_set_error(&a->archive, ENAMETOOLONG, 382 "Pathname too long"); 383 ret = ARCHIVE_FAILED; 384 } else { 385 /* Copy prefix and remainder to appropriate places */ 386 memcpy(h + USTAR_prefix_offset, pp, p - pp); 387 memcpy(h + USTAR_name_offset, p + 1, 388 pp + copy_length - p - 1); 389 } 390 } 391 392 r = archive_entry_hardlink_l(entry, &p, ©_length, sconv); 393 if (r != 0) { 394 if (errno == ENOMEM) { 395 archive_set_error(&a->archive, ENOMEM, 396 "Can't allocate memory for Linkname"); 397 return (ARCHIVE_FATAL); 398 } 399 archive_set_error(&a->archive, 400 ARCHIVE_ERRNO_FILE_FORMAT, 401 "Can't translate linkname '%s' to %s", 402 p, archive_string_conversion_charset_name(sconv)); 403 ret = ARCHIVE_WARN; 404 } 405 if (copy_length > 0) 406 mytartype = '1'; 407 else { 408 r = archive_entry_symlink_l(entry, &p, ©_length, sconv); 409 if (r != 0) { 410 if (errno == ENOMEM) { 411 archive_set_error(&a->archive, ENOMEM, 412 "Can't allocate memory for Linkname"); 413 return (ARCHIVE_FATAL); 414 } 415 archive_set_error(&a->archive, 416 ARCHIVE_ERRNO_FILE_FORMAT, 417 "Can't translate linkname '%s' to %s", 418 p, archive_string_conversion_charset_name(sconv)); 419 ret = ARCHIVE_WARN; 420 } 421 } 422 if (copy_length > 0) { 423 if (copy_length > USTAR_linkname_size) { 424 archive_set_error(&a->archive, ENAMETOOLONG, 425 "Link contents too long"); 426 ret = ARCHIVE_FAILED; 427 copy_length = USTAR_linkname_size; 428 } 429 memcpy(h + USTAR_linkname_offset, p, copy_length); 430 } 431 432 r = archive_entry_uname_l(entry, &p, ©_length, sconv); 433 if (r != 0) { 434 if (errno == ENOMEM) { 435 archive_set_error(&a->archive, ENOMEM, 436 "Can't allocate memory for Uname"); 437 return (ARCHIVE_FATAL); 438 } 439 archive_set_error(&a->archive, 440 ARCHIVE_ERRNO_FILE_FORMAT, 441 "Can't translate uname '%s' to %s", 442 p, archive_string_conversion_charset_name(sconv)); 443 ret = ARCHIVE_WARN; 444 } 445 if (copy_length > 0) { 446 if (copy_length > USTAR_uname_size) { 447 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 448 "Username too long"); 449 ret = ARCHIVE_FAILED; 450 copy_length = USTAR_uname_size; 451 } 452 memcpy(h + USTAR_uname_offset, p, copy_length); 453 } 454 455 r = archive_entry_gname_l(entry, &p, ©_length, sconv); 456 if (r != 0) { 457 if (errno == ENOMEM) { 458 archive_set_error(&a->archive, ENOMEM, 459 "Can't allocate memory for Gname"); 460 return (ARCHIVE_FATAL); 461 } 462 archive_set_error(&a->archive, 463 ARCHIVE_ERRNO_FILE_FORMAT, 464 "Can't translate gname '%s' to %s", 465 p, archive_string_conversion_charset_name(sconv)); 466 ret = ARCHIVE_WARN; 467 } 468 if (copy_length > 0) { 469 if (strlen(p) > USTAR_gname_size) { 470 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 471 "Group name too long"); 472 ret = ARCHIVE_FAILED; 473 copy_length = USTAR_gname_size; 474 } 475 memcpy(h + USTAR_gname_offset, p, copy_length); 476 } 477 478 if (format_number(archive_entry_mode(entry) & 07777, 479 h + USTAR_mode_offset, USTAR_mode_size, USTAR_mode_max_size, strict)) { 480 archive_set_error(&a->archive, ERANGE, 481 "Numeric mode too large"); 482 ret = ARCHIVE_FAILED; 483 } 484 485 if (format_number(archive_entry_uid(entry), 486 h + USTAR_uid_offset, USTAR_uid_size, USTAR_uid_max_size, strict)) { 487 archive_set_error(&a->archive, ERANGE, 488 "Numeric user ID too large"); 489 ret = ARCHIVE_FAILED; 490 } 491 492 if (format_number(archive_entry_gid(entry), 493 h + USTAR_gid_offset, USTAR_gid_size, USTAR_gid_max_size, strict)) { 494 archive_set_error(&a->archive, ERANGE, 495 "Numeric group ID too large"); 496 ret = ARCHIVE_FAILED; 497 } 498 499 if (format_number(archive_entry_size(entry), 500 h + USTAR_size_offset, USTAR_size_size, USTAR_size_max_size, strict)) { 501 archive_set_error(&a->archive, ERANGE, 502 "File size out of range"); 503 ret = ARCHIVE_FAILED; 504 } 505 506 if (format_number(archive_entry_mtime(entry), 507 h + USTAR_mtime_offset, USTAR_mtime_size, USTAR_mtime_max_size, strict)) { 508 archive_set_error(&a->archive, ERANGE, 509 "File modification time too large"); 510 ret = ARCHIVE_FAILED; 511 } 512 513 if (archive_entry_filetype(entry) == AE_IFBLK 514 || archive_entry_filetype(entry) == AE_IFCHR) { 515 if (format_number(archive_entry_rdevmajor(entry), 516 h + USTAR_rdevmajor_offset, USTAR_rdevmajor_size, 517 USTAR_rdevmajor_max_size, strict)) { 518 archive_set_error(&a->archive, ERANGE, 519 "Major device number too large"); 520 ret = ARCHIVE_FAILED; 521 } 522 523 if (format_number(archive_entry_rdevminor(entry), 524 h + USTAR_rdevminor_offset, USTAR_rdevminor_size, 525 USTAR_rdevminor_max_size, strict)) { 526 archive_set_error(&a->archive, ERANGE, 527 "Minor device number too large"); 528 ret = ARCHIVE_FAILED; 529 } 530 } 531 532 if (tartype >= 0) { 533 h[USTAR_typeflag_offset] = tartype; 534 } else if (mytartype >= 0) { 535 h[USTAR_typeflag_offset] = mytartype; 536 } else { 537 switch (archive_entry_filetype(entry)) { 538 case AE_IFREG: h[USTAR_typeflag_offset] = '0' ; break; 539 case AE_IFLNK: h[USTAR_typeflag_offset] = '2' ; break; 540 case AE_IFCHR: h[USTAR_typeflag_offset] = '3' ; break; 541 case AE_IFBLK: h[USTAR_typeflag_offset] = '4' ; break; 542 case AE_IFDIR: h[USTAR_typeflag_offset] = '5' ; break; 543 case AE_IFIFO: h[USTAR_typeflag_offset] = '6' ; break; 544 case AE_IFSOCK: 545 archive_set_error(&a->archive, 546 ARCHIVE_ERRNO_FILE_FORMAT, 547 "tar format cannot archive socket"); 548 return (ARCHIVE_FAILED); 549 default: 550 archive_set_error(&a->archive, 551 ARCHIVE_ERRNO_FILE_FORMAT, 552 "tar format cannot archive this (mode=0%lo)", 553 (unsigned long)archive_entry_mode(entry)); 554 ret = ARCHIVE_FAILED; 555 } 556 } 557 558 checksum = 0; 559 for (i = 0; i < 512; i++) 560 checksum += 255 & (unsigned int)h[i]; 561 h[USTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */ 562 /* h[USTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */ 563 format_octal(checksum, h + USTAR_checksum_offset, 6); 564 return (ret); 565 } 566 567 /* 568 * Format a number into a field, with some intelligence. 569 */ 570 static int 571 format_number(int64_t v, char *p, int s, int maxsize, int strict) 572 { 573 int64_t limit; 574 575 limit = ((int64_t)1 << (s*3)); 576 577 /* "Strict" only permits octal values with proper termination. */ 578 if (strict) 579 return (format_octal(v, p, s)); 580 581 /* 582 * In non-strict mode, we allow the number to overwrite one or 583 * more bytes of the field termination. Even old tar 584 * implementations should be able to handle this with no 585 * problem. 586 */ 587 if (v >= 0) { 588 while (s <= maxsize) { 589 if (v < limit) 590 return (format_octal(v, p, s)); 591 s++; 592 limit <<= 3; 593 } 594 } 595 596 /* Base-256 can handle any number, positive or negative. */ 597 return (format_256(v, p, maxsize)); 598 } 599 600 /* 601 * Format a number into the specified field using base-256. 602 */ 603 static int 604 format_256(int64_t v, char *p, int s) 605 { 606 p += s; 607 while (s-- > 0) { 608 *--p = (char)(v & 0xff); 609 v >>= 8; 610 } 611 *p |= 0x80; /* Set the base-256 marker bit. */ 612 return (0); 613 } 614 615 /* 616 * Format a number into the specified field. 617 */ 618 static int 619 format_octal(int64_t v, char *p, int s) 620 { 621 int len; 622 623 len = s; 624 625 /* Octal values can't be negative, so use 0. */ 626 if (v < 0) { 627 while (len-- > 0) 628 *p++ = '0'; 629 return (-1); 630 } 631 632 p += s; /* Start at the end and work backwards. */ 633 while (s-- > 0) { 634 *--p = (char)('0' + (v & 7)); 635 v >>= 3; 636 } 637 638 if (v == 0) 639 return (0); 640 641 /* If it overflowed, fill field with max value. */ 642 while (len-- > 0) 643 *p++ = '7'; 644 645 return (-1); 646 } 647 648 static int 649 archive_write_ustar_close(struct archive_write *a) 650 { 651 return (__archive_write_nulls(a, 512*2)); 652 } 653 654 static int 655 archive_write_ustar_free(struct archive_write *a) 656 { 657 struct ustar *ustar; 658 659 ustar = (struct ustar *)a->format_data; 660 free(ustar); 661 a->format_data = NULL; 662 return (ARCHIVE_OK); 663 } 664 665 static int 666 archive_write_ustar_finish_entry(struct archive_write *a) 667 { 668 struct ustar *ustar; 669 int ret; 670 671 ustar = (struct ustar *)a->format_data; 672 ret = __archive_write_nulls(a, 673 ustar->entry_bytes_remaining + ustar->entry_padding); 674 ustar->entry_bytes_remaining = ustar->entry_padding = 0; 675 return (ret); 676 } 677 678 static ssize_t 679 archive_write_ustar_data(struct archive_write *a, const void *buff, size_t s) 680 { 681 struct ustar *ustar; 682 int ret; 683 684 ustar = (struct ustar *)a->format_data; 685 if (s > ustar->entry_bytes_remaining) 686 s = ustar->entry_bytes_remaining; 687 ret = __archive_write_output(a, buff, s); 688 ustar->entry_bytes_remaining -= s; 689 if (ret != ARCHIVE_OK) 690 return (ret); 691 return (s); 692 } 693