1 /*- 2 * Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies). 3 * Author: Jonas Gastal <jgastal@profusion.mobi> 4 * Copyright (c) 2011 Michihiro NAKAJIMA 5 * 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR 18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 20 * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT, 21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #include "archive_platform.h" 30 __FBSDID("$FreeBSD: head/lib/libarchive/archive_write_set_format_gnu_tar.c 191579 2009-04-27 18:35:03Z gastal $"); 31 32 33 #ifdef HAVE_ERRNO_H 34 #include <errno.h> 35 #endif 36 #include <stdio.h> 37 #ifdef HAVE_STDLIB_H 38 #include <stdlib.h> 39 #endif 40 #ifdef HAVE_STRING_H 41 #include <string.h> 42 #endif 43 44 #include "archive.h" 45 #include "archive_entry.h" 46 #include "archive_entry_locale.h" 47 #include "archive_private.h" 48 #include "archive_write_private.h" 49 50 struct gnutar { 51 uint64_t entry_bytes_remaining; 52 uint64_t entry_padding; 53 const char * linkname; 54 size_t linkname_length; 55 const char * pathname; 56 size_t pathname_length; 57 const char * uname; 58 size_t uname_length; 59 const char * gname; 60 size_t gname_length; 61 struct archive_string_conv *opt_sconv; 62 struct archive_string_conv *sconv_default; 63 int init_default_conversion; 64 }; 65 66 /* 67 * Define structure of GNU tar header. 68 */ 69 #define GNUTAR_name_offset 0 70 #define GNUTAR_name_size 100 71 #define GNUTAR_mode_offset 100 72 #define GNUTAR_mode_size 7 73 #define GNUTAR_mode_max_size 8 74 #define GNUTAR_uid_offset 108 75 #define GNUTAR_uid_size 7 76 #define GNUTAR_uid_max_size 8 77 #define GNUTAR_gid_offset 116 78 #define GNUTAR_gid_size 7 79 #define GNUTAR_gid_max_size 8 80 #define GNUTAR_size_offset 124 81 #define GNUTAR_size_size 11 82 #define GNUTAR_size_max_size 12 83 #define GNUTAR_mtime_offset 136 84 #define GNUTAR_mtime_size 11 85 #define GNUTAR_mtime_max_size 11 86 #define GNUTAR_checksum_offset 148 87 #define GNUTAR_checksum_size 8 88 #define GNUTAR_typeflag_offset 156 89 #define GNUTAR_typeflag_size 1 90 #define GNUTAR_linkname_offset 157 91 #define GNUTAR_linkname_size 100 92 #define GNUTAR_magic_offset 257 93 #define GNUTAR_magic_size 6 94 #define GNUTAR_version_offset 263 95 #define GNUTAR_version_size 2 96 #define GNUTAR_uname_offset 265 97 #define GNUTAR_uname_size 32 98 #define GNUTAR_gname_offset 297 99 #define GNUTAR_gname_size 32 100 #define GNUTAR_rdevmajor_offset 329 101 #define GNUTAR_rdevmajor_size 6 102 #define GNUTAR_rdevmajor_max_size 8 103 #define GNUTAR_rdevminor_offset 337 104 #define GNUTAR_rdevminor_size 6 105 #define GNUTAR_rdevminor_max_size 8 106 107 /* 108 * A filled-in copy of the header for initialization. 109 */ 110 static const char template_header[] = { 111 /* name: 100 bytes */ 112 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, 113 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, 114 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, 115 0,0,0,0, 116 /* Mode, null termination: 8 bytes */ 117 '0','0','0','0','0','0', '0','\0', 118 /* uid, null termination: 8 bytes */ 119 '0','0','0','0','0','0', '0','\0', 120 /* gid, null termination: 8 bytes */ 121 '0','0','0','0','0','0', '0','\0', 122 /* size, space termation: 12 bytes */ 123 '0','0','0','0','0','0','0','0','0','0','0', '\0', 124 /* mtime, space termation: 12 bytes */ 125 '0','0','0','0','0','0','0','0','0','0','0', '\0', 126 /* Initial checksum value: 8 spaces */ 127 ' ',' ',' ',' ',' ',' ',' ',' ', 128 /* Typeflag: 1 byte */ 129 '0', /* '0' = regular file */ 130 /* Linkname: 100 bytes */ 131 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, 132 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, 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 0,0,0,0, 135 /* Magic: 8 bytes */ 136 'u','s','t','a','r',' ', ' ','\0', 137 /* Uname: 32 bytes */ 138 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, 139 /* Gname: 32 bytes */ 140 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, 141 /* rdevmajor + null padding: 8 bytes */ 142 '\0','\0','\0','\0','\0','\0', '\0','\0', 143 /* rdevminor + null padding: 8 bytes */ 144 '\0','\0','\0','\0','\0','\0', '\0','\0', 145 /* Padding: 167 bytes */ 146 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, 147 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, 148 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, 149 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, 150 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, 151 0,0,0,0,0,0,0 152 }; 153 154 static int archive_write_gnutar_options(struct archive_write *, 155 const char *, const char *); 156 static int archive_format_gnutar_header(struct archive_write *, char h[512], 157 struct archive_entry *, int tartype); 158 static int archive_write_gnutar_header(struct archive_write *, 159 struct archive_entry *entry); 160 static ssize_t archive_write_gnutar_data(struct archive_write *a, const void *buff, 161 size_t s); 162 static int archive_write_gnutar_free(struct archive_write *); 163 static int archive_write_gnutar_close(struct archive_write *); 164 static int archive_write_gnutar_finish_entry(struct archive_write *); 165 static int format_256(int64_t, char *, int); 166 static int format_number(int64_t, char *, int size, int maxsize); 167 static int format_octal(int64_t, char *, int); 168 169 /* 170 * Set output format to 'GNU tar' format. 171 */ 172 int 173 archive_write_set_format_gnutar(struct archive *_a) 174 { 175 struct archive_write *a = (struct archive_write *)_a; 176 struct gnutar *gnutar; 177 178 gnutar = (struct gnutar *)calloc(1, sizeof(*gnutar)); 179 if (gnutar == NULL) { 180 archive_set_error(&a->archive, ENOMEM, "Can't allocate gnutar data"); 181 return (ARCHIVE_FATAL); 182 } 183 a->format_data = gnutar; 184 a->format_name = "gnutar"; 185 a->format_options = archive_write_gnutar_options; 186 a->format_write_header = archive_write_gnutar_header; 187 a->format_write_data = archive_write_gnutar_data; 188 a->format_close = archive_write_gnutar_close; 189 a->format_free = archive_write_gnutar_free; 190 a->format_finish_entry = archive_write_gnutar_finish_entry; 191 a->archive.archive_format = ARCHIVE_FORMAT_TAR_GNUTAR; 192 a->archive.archive_format_name = "GNU tar"; 193 return (ARCHIVE_OK); 194 } 195 196 static int 197 archive_write_gnutar_options(struct archive_write *a, const char *key, 198 const char *val) 199 { 200 struct gnutar *gnutar = (struct gnutar *)a->format_data; 201 int ret = ARCHIVE_FAILED; 202 203 if (strcmp(key, "hdrcharset") == 0) { 204 if (val == NULL || val[0] == 0) 205 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 206 "%s: hdrcharset option needs a character-set name", 207 a->format_name); 208 else { 209 gnutar->opt_sconv = archive_string_conversion_to_charset( 210 &a->archive, val, 0); 211 if (gnutar->opt_sconv != NULL) 212 ret = ARCHIVE_OK; 213 else 214 ret = ARCHIVE_FATAL; 215 } 216 } else 217 archive_set_error(&a->archive, ARCHIVE_ERRNO_MISC, 218 "%s: unknown keyword ``%s''", a->format_name, key); 219 220 return (ret); 221 } 222 223 static int 224 archive_write_gnutar_close(struct archive_write *a) 225 { 226 return (__archive_write_nulls(a, 512*2)); 227 } 228 229 static int 230 archive_write_gnutar_free(struct archive_write *a) 231 { 232 struct gnutar *gnutar; 233 234 gnutar = (struct gnutar *)a->format_data; 235 free(gnutar); 236 a->format_data = NULL; 237 return (ARCHIVE_OK); 238 } 239 240 static int 241 archive_write_gnutar_finish_entry(struct archive_write *a) 242 { 243 struct gnutar *gnutar; 244 int ret; 245 246 gnutar = (struct gnutar *)a->format_data; 247 ret = __archive_write_nulls(a, 248 gnutar->entry_bytes_remaining + gnutar->entry_padding); 249 gnutar->entry_bytes_remaining = gnutar->entry_padding = 0; 250 return (ret); 251 } 252 253 static ssize_t 254 archive_write_gnutar_data(struct archive_write *a, const void *buff, size_t s) 255 { 256 struct gnutar *gnutar; 257 int ret; 258 259 gnutar = (struct gnutar *)a->format_data; 260 if (s > gnutar->entry_bytes_remaining) 261 s = gnutar->entry_bytes_remaining; 262 ret = __archive_write_output(a, buff, s); 263 gnutar->entry_bytes_remaining -= s; 264 if (ret != ARCHIVE_OK) 265 return (ret); 266 return (s); 267 } 268 269 static int 270 archive_write_gnutar_header(struct archive_write *a, 271 struct archive_entry *entry) 272 { 273 char buff[512]; 274 int r, ret, ret2 = ARCHIVE_OK; 275 int tartype; 276 struct gnutar *gnutar; 277 struct archive_string_conv *sconv; 278 279 gnutar = (struct gnutar *)a->format_data; 280 281 /* Setup default string conversion. */ 282 if (gnutar->opt_sconv == NULL) { 283 if (!gnutar->init_default_conversion) { 284 gnutar->sconv_default = 285 archive_string_default_conversion_for_write( 286 &(a->archive)); 287 gnutar->init_default_conversion = 1; 288 } 289 sconv = gnutar->sconv_default; 290 } else 291 sconv = gnutar->opt_sconv; 292 293 /* Only regular files (not hardlinks) have data. */ 294 if (archive_entry_hardlink(entry) != NULL || 295 archive_entry_symlink(entry) != NULL || 296 !(archive_entry_filetype(entry) == AE_IFREG)) 297 archive_entry_set_size(entry, 0); 298 299 if (AE_IFDIR == archive_entry_filetype(entry)) { 300 const char *p; 301 char *t; 302 /* 303 * Ensure a trailing '/'. Modify the entry so 304 * the client sees the change. 305 */ 306 p = archive_entry_pathname(entry); 307 if (p[strlen(p) - 1] != '/') { 308 t = (char *)malloc(strlen(p) + 2); 309 if (t == NULL) { 310 archive_set_error(&a->archive, ENOMEM, 311 "Can't allocate gnutar data"); 312 return(ARCHIVE_FATAL); 313 } 314 strcpy(t, p); 315 strcat(t, "/"); 316 archive_entry_copy_pathname(entry, t); 317 free(t); 318 } 319 } 320 321 r = archive_entry_pathname_l(entry, &(gnutar->pathname), 322 &(gnutar->pathname_length), sconv); 323 if (r != 0) { 324 if (errno == ENOMEM) { 325 archive_set_error(&a->archive, ENOMEM, 326 "Can't allocate memory for Pathame"); 327 return (ARCHIVE_FATAL); 328 } 329 archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, 330 "Can't translate pathname '%s' to %s", 331 archive_entry_pathname(entry), 332 archive_string_conversion_charset_name(sconv)); 333 ret2 = ARCHIVE_WARN; 334 } 335 r = archive_entry_uname_l(entry, &(gnutar->uname), 336 &(gnutar->uname_length), sconv); 337 if (r != 0) { 338 if (errno == ENOMEM) { 339 archive_set_error(&a->archive, ENOMEM, 340 "Can't allocate memory for Uname"); 341 return (ARCHIVE_FATAL); 342 } 343 archive_set_error(&a->archive, 344 ARCHIVE_ERRNO_FILE_FORMAT, 345 "Can't translate uname '%s' to %s", 346 archive_entry_uname(entry), 347 archive_string_conversion_charset_name(sconv)); 348 ret2 = ARCHIVE_WARN; 349 } 350 r = archive_entry_gname_l(entry, &(gnutar->gname), 351 &(gnutar->gname_length), sconv); 352 if (r != 0) { 353 if (errno == ENOMEM) { 354 archive_set_error(&a->archive, ENOMEM, 355 "Can't allocate memory for Gname"); 356 return (ARCHIVE_FATAL); 357 } 358 archive_set_error(&a->archive, 359 ARCHIVE_ERRNO_FILE_FORMAT, 360 "Can't translate gname '%s' to %s", 361 archive_entry_gname(entry), 362 archive_string_conversion_charset_name(sconv)); 363 ret2 = ARCHIVE_WARN; 364 } 365 366 /* If linkname is longer than 100 chars we need to add a 'K' header. */ 367 r = archive_entry_hardlink_l(entry, &(gnutar->linkname), 368 &(gnutar->linkname_length), sconv); 369 if (r != 0) { 370 if (errno == ENOMEM) { 371 archive_set_error(&a->archive, ENOMEM, 372 "Can't allocate memory for Linkname"); 373 return (ARCHIVE_FATAL); 374 } 375 archive_set_error(&a->archive, 376 ARCHIVE_ERRNO_FILE_FORMAT, 377 "Can't translate linkname '%s' to %s", 378 archive_entry_hardlink(entry), 379 archive_string_conversion_charset_name(sconv)); 380 ret2 = ARCHIVE_WARN; 381 } 382 if (gnutar->linkname_length == 0) { 383 r = archive_entry_symlink_l(entry, &(gnutar->linkname), 384 &(gnutar->linkname_length), sconv); 385 if (r != 0) { 386 if (errno == ENOMEM) { 387 archive_set_error(&a->archive, ENOMEM, 388 "Can't allocate memory for Linkname"); 389 return (ARCHIVE_FATAL); 390 } 391 archive_set_error(&a->archive, 392 ARCHIVE_ERRNO_FILE_FORMAT, 393 "Can't translate linkname '%s' to %s", 394 archive_entry_hardlink(entry), 395 archive_string_conversion_charset_name(sconv)); 396 ret2 = ARCHIVE_WARN; 397 } 398 } 399 if (gnutar->linkname_length > GNUTAR_linkname_size) { 400 size_t todo = gnutar->linkname_length; 401 struct archive_entry *temp = archive_entry_new2(&a->archive); 402 403 /* Uname/gname here don't really matter since no one reads them; 404 * these are the values that GNU tar happens to use on FreeBSD. */ 405 archive_entry_set_uname(temp, "root"); 406 archive_entry_set_gname(temp, "wheel"); 407 408 archive_entry_set_pathname(temp, "././@LongLink"); 409 archive_entry_set_size(temp, gnutar->linkname_length + 1); 410 ret = archive_format_gnutar_header(a, buff, temp, 'K'); 411 if (ret < ARCHIVE_WARN) 412 return (ret); 413 ret = __archive_write_output(a, buff, 512); 414 if(ret < ARCHIVE_WARN) 415 return (ret); 416 archive_entry_free(temp); 417 /* Write as many 512 bytes blocks as needed to write full name. */ 418 ret = __archive_write_output(a, gnutar->linkname, todo); 419 if(ret < ARCHIVE_WARN) 420 return (ret); 421 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)todo)); 422 if (ret < ARCHIVE_WARN) 423 return (ret); 424 } 425 426 /* If pathname is longer than 100 chars we need to add an 'L' header. */ 427 if (gnutar->pathname_length > GNUTAR_name_size) { 428 const char *pathname = gnutar->pathname; 429 size_t todo = gnutar->pathname_length; 430 struct archive_entry *temp = archive_entry_new2(&a->archive); 431 432 /* Uname/gname here don't really matter since no one reads them; 433 * these are the values that GNU tar happens to use on FreeBSD. */ 434 archive_entry_set_uname(temp, "root"); 435 archive_entry_set_gname(temp, "wheel"); 436 437 archive_entry_set_pathname(temp, "././@LongLink"); 438 archive_entry_set_size(temp, gnutar->pathname_length + 1); 439 ret = archive_format_gnutar_header(a, buff, temp, 'L'); 440 if (ret < ARCHIVE_WARN) 441 return (ret); 442 ret = __archive_write_output(a, buff, 512); 443 if(ret < ARCHIVE_WARN) 444 return (ret); 445 archive_entry_free(temp); 446 /* Write as many 512 bytes blocks as needed to write full name. */ 447 ret = __archive_write_output(a, pathname, todo); 448 if(ret < ARCHIVE_WARN) 449 return (ret); 450 ret = __archive_write_nulls(a, 0x1ff & (-(ssize_t)todo)); 451 if (ret < ARCHIVE_WARN) 452 return (ret); 453 } 454 455 if (archive_entry_hardlink(entry) != NULL) { 456 tartype = '1'; 457 } else 458 switch (archive_entry_filetype(entry)) { 459 case AE_IFREG: tartype = '0' ; break; 460 case AE_IFLNK: tartype = '2' ; break; 461 case AE_IFCHR: tartype = '3' ; break; 462 case AE_IFBLK: tartype = '4' ; break; 463 case AE_IFDIR: tartype = '5' ; break; 464 case AE_IFIFO: tartype = '6' ; break; 465 case AE_IFSOCK: 466 archive_set_error(&a->archive, 467 ARCHIVE_ERRNO_FILE_FORMAT, 468 "tar format cannot archive socket"); 469 return (ARCHIVE_FAILED); 470 default: 471 archive_set_error(&a->archive, 472 ARCHIVE_ERRNO_FILE_FORMAT, 473 "tar format cannot archive this (mode=0%lo)", 474 (unsigned long)archive_entry_mode(entry)); 475 return (ARCHIVE_FAILED); 476 } 477 478 ret = archive_format_gnutar_header(a, buff, entry, tartype); 479 if (ret < ARCHIVE_WARN) 480 return (ret); 481 if (ret2 < ret) 482 ret = ret2; 483 ret2 = __archive_write_output(a, buff, 512); 484 if (ret2 < ARCHIVE_WARN) 485 return (ret2); 486 if (ret2 < ret) 487 ret = ret2; 488 489 gnutar->entry_bytes_remaining = archive_entry_size(entry); 490 gnutar->entry_padding = 0x1ff & (-(int64_t)gnutar->entry_bytes_remaining); 491 return (ret); 492 } 493 494 static int 495 archive_format_gnutar_header(struct archive_write *a, char h[512], 496 struct archive_entry *entry, int tartype) 497 { 498 unsigned int checksum; 499 int i, ret; 500 size_t copy_length; 501 const char *p; 502 struct gnutar *gnutar; 503 504 gnutar = (struct gnutar *)a->format_data; 505 506 ret = 0; 507 508 /* 509 * The "template header" already includes the signature, 510 * various end-of-field markers, and other required elements. 511 */ 512 memcpy(h, &template_header, 512); 513 514 /* 515 * Because the block is already null-filled, and strings 516 * are allowed to exactly fill their destination (without null), 517 * I use memcpy(dest, src, strlen()) here a lot to copy strings. 518 */ 519 520 if (tartype == 'K' || tartype == 'L') { 521 p = archive_entry_pathname(entry); 522 copy_length = strlen(p); 523 } else { 524 p = gnutar->pathname; 525 copy_length = gnutar->pathname_length; 526 } 527 if (copy_length > GNUTAR_name_size) 528 copy_length = GNUTAR_name_size; 529 memcpy(h + GNUTAR_name_offset, p, copy_length); 530 531 if ((copy_length = gnutar->linkname_length) > 0) { 532 if (copy_length > GNUTAR_linkname_size) 533 copy_length = GNUTAR_linkname_size; 534 memcpy(h + GNUTAR_linkname_offset, gnutar->linkname, 535 copy_length); 536 } 537 538 /* TODO: How does GNU tar handle unames longer than GNUTAR_uname_size? */ 539 if (tartype == 'K' || tartype == 'L') { 540 p = archive_entry_uname(entry); 541 copy_length = strlen(p); 542 } else { 543 p = gnutar->uname; 544 copy_length = gnutar->uname_length; 545 } 546 if (copy_length > 0) { 547 if (copy_length > GNUTAR_uname_size) 548 copy_length = GNUTAR_uname_size; 549 memcpy(h + GNUTAR_uname_offset, p, copy_length); 550 } 551 552 /* TODO: How does GNU tar handle gnames longer than GNUTAR_gname_size? */ 553 if (tartype == 'K' || tartype == 'L') { 554 p = archive_entry_gname(entry); 555 copy_length = strlen(p); 556 } else { 557 p = gnutar->gname; 558 copy_length = gnutar->gname_length; 559 } 560 if (copy_length > 0) { 561 if (strlen(p) > GNUTAR_gname_size) 562 copy_length = GNUTAR_gname_size; 563 memcpy(h + GNUTAR_gname_offset, p, copy_length); 564 } 565 566 /* By truncating the mode here, we ensure it always fits. */ 567 format_octal(archive_entry_mode(entry) & 07777, 568 h + GNUTAR_mode_offset, GNUTAR_mode_size); 569 570 /* TODO: How does GNU tar handle large UIDs? */ 571 if (format_octal(archive_entry_uid(entry), 572 h + GNUTAR_uid_offset, GNUTAR_uid_size)) { 573 archive_set_error(&a->archive, ERANGE, 574 "Numeric user ID %jd too large", 575 (intmax_t)archive_entry_uid(entry)); 576 ret = ARCHIVE_FAILED; 577 } 578 579 /* TODO: How does GNU tar handle large GIDs? */ 580 if (format_octal(archive_entry_gid(entry), 581 h + GNUTAR_gid_offset, GNUTAR_gid_size)) { 582 archive_set_error(&a->archive, ERANGE, 583 "Numeric group ID %jd too large", 584 (intmax_t)archive_entry_gid(entry)); 585 ret = ARCHIVE_FAILED; 586 } 587 588 /* GNU tar supports base-256 here, so should never overflow. */ 589 if (format_number(archive_entry_size(entry), h + GNUTAR_size_offset, 590 GNUTAR_size_size, GNUTAR_size_max_size)) { 591 archive_set_error(&a->archive, ERANGE, 592 "File size out of range"); 593 ret = ARCHIVE_FAILED; 594 } 595 596 /* Shouldn't overflow before 2106, since mtime field is 33 bits. */ 597 format_octal(archive_entry_mtime(entry), 598 h + GNUTAR_mtime_offset, GNUTAR_mtime_size); 599 600 if (archive_entry_filetype(entry) == AE_IFBLK 601 || archive_entry_filetype(entry) == AE_IFCHR) { 602 if (format_octal(archive_entry_rdevmajor(entry), 603 h + GNUTAR_rdevmajor_offset, 604 GNUTAR_rdevmajor_size)) { 605 archive_set_error(&a->archive, ERANGE, 606 "Major device number too large"); 607 ret = ARCHIVE_FAILED; 608 } 609 610 if (format_octal(archive_entry_rdevminor(entry), 611 h + GNUTAR_rdevminor_offset, 612 GNUTAR_rdevminor_size)) { 613 archive_set_error(&a->archive, ERANGE, 614 "Minor device number too large"); 615 ret = ARCHIVE_FAILED; 616 } 617 } 618 619 h[GNUTAR_typeflag_offset] = tartype; 620 621 checksum = 0; 622 for (i = 0; i < 512; i++) 623 checksum += 255 & (unsigned int)h[i]; 624 h[GNUTAR_checksum_offset + 6] = '\0'; /* Can't be pre-set in the template. */ 625 /* h[GNUTAR_checksum_offset + 7] = ' '; */ /* This is pre-set in the template. */ 626 format_octal(checksum, h + GNUTAR_checksum_offset, 6); 627 return (ret); 628 } 629 630 /* 631 * Format a number into a field, falling back to base-256 if necessary. 632 */ 633 static int 634 format_number(int64_t v, char *p, int s, int maxsize) 635 { 636 int64_t limit = ((int64_t)1 << (s*3)); 637 638 if (v < limit) 639 return (format_octal(v, p, s)); 640 return (format_256(v, p, maxsize)); 641 } 642 643 /* 644 * Format a number into the specified field using base-256. 645 */ 646 static int 647 format_256(int64_t v, char *p, int s) 648 { 649 p += s; 650 while (s-- > 0) { 651 *--p = (char)(v & 0xff); 652 v >>= 8; 653 } 654 *p |= 0x80; /* Set the base-256 marker bit. */ 655 return (0); 656 } 657 658 /* 659 * Format a number into the specified field using octal. 660 */ 661 static int 662 format_octal(int64_t v, char *p, int s) 663 { 664 int len = s; 665 666 /* Octal values can't be negative, so use 0. */ 667 if (v < 0) 668 v = 0; 669 670 p += s; /* Start at the end and work backwards. */ 671 while (s-- > 0) { 672 *--p = (char)('0' + (v & 7)); 673 v >>= 3; 674 } 675 676 if (v == 0) 677 return (0); 678 679 /* If it overflowed, fill field with max value. */ 680 while (len-- > 0) 681 *p++ = '7'; 682 683 return (-1); 684 } 685