archival/unzip.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Mini unzip implementation for busybox
   4  *
   5  * Copyright (C) 2004 by Ed Clark
   6  *
   7  * Loosely based on original busybox unzip applet by Laurence Anderson.
   8  * All options and features should work in this version.
   9  *
  10  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  11  */
  12
  13 /* For reference see
  14  * http://www.pkware.com/company/standards/appnote/
  15  * http://www.info-zip.org/pub/infozip/doc/appnote-iz-latest.zip
  16  */
  17
  18 /* TODO
  19  * Zip64 + other methods
  20  */
  21
  22 #include "libbb.h"
  23 #include "unarchive.h"
  24
  25 enum {
  26 #if BB_BIG_ENDIAN
  27         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  28         ZIP_CDS_MAGIC        = 0x504b0102,
  29         ZIP_CDE_MAGIC        = 0x504b0506,
  30         ZIP_DD_MAGIC         = 0x504b0708,
  31 #else
  32         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  33         ZIP_CDS_MAGIC        = 0x02014b50,
  34         ZIP_CDE_MAGIC        = 0x06054b50,
  35         ZIP_DD_MAGIC         = 0x08074b50,
  36 #endif
  37 };
  38
  39 #define ZIP_HEADER_LEN 26
  40
  41 typedef union {
  42         uint8_t raw[ZIP_HEADER_LEN];
  43         struct {
  44                 uint16_t version;               /* 0-1 */
  45                 uint16_t flags;                 /* 2-3 */
  46                 uint16_t method;                /* 4-5 */
  47                 uint16_t modtime;               /* 6-7 */
  48                 uint16_t moddate;               /* 8-9 */
  49                 uint32_t crc32 PACKED;          /* 10-13 */
  50                 uint32_t cmpsize PACKED;        /* 14-17 */
  51                 uint32_t ucmpsize PACKED;       /* 18-21 */
  52                 uint16_t filename_len;          /* 22-23 */
  53                 uint16_t extra_len;             /* 24-25 */
  54         } formatted PACKED;
  55 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  56
  57 /* Check the offset of the last element, not the length.  This leniency
  58  * allows for poor packing, whereby the overall struct may be too long,
  59  * even though the elements are all in the right place.
  60  */
  61 struct BUG_zip_header_must_be_26_bytes {
  62         char BUG_zip_header_must_be_26_bytes[
  63                 offsetof(zip_header_t, formatted.extra_len) + 2
  64                         == ZIP_HEADER_LEN ? 1 : -1];
  65 };
  66
  67 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  68         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  69         (zip_header).formatted.flags        = SWAP_LE16((zip_header).formatted.flags       ); \
  70         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  71         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  72         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  73         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  74         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  75         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  76         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  77         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  78 } while (0)
  79
  80 #define CDS_HEADER_LEN 42
  81
  82 typedef union {
  83         uint8_t raw[CDS_HEADER_LEN];
  84         struct {
  85                 /* uint32_t signature; 50 4b 01 02 */
  86                 uint16_t version_made_by;       /* 0-1 */
  87                 uint16_t version_needed;        /* 2-3 */
  88                 uint16_t cds_flags;             /* 4-5 */
  89                 uint16_t method;                /* 6-7 */
  90                 uint16_t mtime;                 /* 8-9 */
  91                 uint16_t mdate;                 /* 10-11 */
  92                 uint32_t crc32;                 /* 12-15 */
  93                 uint32_t cmpsize;               /* 16-19 */
  94                 uint32_t ucmpsize;              /* 20-23 */
  95                 uint16_t file_name_length;      /* 24-25 */
  96                 uint16_t extra_field_length;    /* 26-27 */
  97                 uint16_t file_comment_length;   /* 28-29 */
  98                 uint16_t disk_number_start;     /* 30-31 */
  99                 uint16_t internal_file_attributes; /* 32-33 */
 100                 uint32_t external_file_attributes PACKED; /* 34-37 */
 101                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 102         } formatted PACKED;
 103 } cds_header_t;
 104
 105 struct BUG_cds_header_must_be_42_bytes {
 106         char BUG_cds_header_must_be_42_bytes[
 107                 offsetof(cds_header_t, formatted.relative_offset_of_local_header) + 4
 108                         == CDS_HEADER_LEN ? 1 : -1];
 109 };
 110
 111 #define FIX_ENDIANNESS_CDS(cds_header) do { \
 112         (cds_header).formatted.crc32        = SWAP_LE32((cds_header).formatted.crc32       ); \
 113         (cds_header).formatted.cmpsize      = SWAP_LE32((cds_header).formatted.cmpsize     ); \
 114         (cds_header).formatted.ucmpsize     = SWAP_LE32((cds_header).formatted.ucmpsize    ); \
 115         (cds_header).formatted.file_name_length = SWAP_LE16((cds_header).formatted.file_name_length); \
 116         (cds_header).formatted.extra_field_length = SWAP_LE16((cds_header).formatted.extra_field_length); \
 117         (cds_header).formatted.file_comment_length = SWAP_LE16((cds_header).formatted.file_comment_length); \
 118 } while (0)
 119
 120 #define CDE_HEADER_LEN 16
 121
 122 typedef union {
 123         uint8_t raw[CDE_HEADER_LEN];
 124         struct {
 125                 /* uint32_t signature; 50 4b 05 06 */
 126                 uint16_t this_disk_no;
 127                 uint16_t disk_with_cds_no;
 128                 uint16_t cds_entries_on_this_disk;
 129                 uint16_t cds_entries_total;
 130                 uint32_t cds_size;
 131                 uint32_t cds_offset;
 132                 /* uint16_t file_comment_length; */
 133                 /* .ZIP file comment (variable size) */
 134         } formatted PACKED;
 135 } cde_header_t;
 136
 137 struct BUG_cde_header_must_be_16_bytes {
 138         char BUG_cde_header_must_be_16_bytes[
 139                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 140 };
 141
 142 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 143         (cde_header).formatted.cds_offset = SWAP_LE32((cde_header).formatted.cds_offset); \
 144 } while (0)
 145
 146 enum { zip_fd = 3 };
 147
 148
 149 #if ENABLE_DESKTOP
 150 /* NB: does not preserve file position! */
 151 static uint32_t find_cds_offset(void)
 152 {
 153         unsigned char buf[1024];
 154         cde_header_t cde_header;
 155         unsigned char *p;
 156         off_t end;
 157
 158         end = xlseek(zip_fd, 0, SEEK_END);
 159         if (end < 1024)
 160                 end = 1024;
 161         end -= 1024;
 162         xlseek(zip_fd, end, SEEK_SET);
 163         full_read(zip_fd, buf, 1024);
 164
 165         p = buf;
 166         while (p <= buf + 1024 - CDE_HEADER_LEN - 4) {
 167                 if (*p != 'P') {
 168                         p++;
 169                         continue;
 170                 }
 171                 if (*++p != 'K')
 172                         continue;
 173                 if (*++p != 5)
 174                         continue;
 175                 if (*++p != 6)
 176                         continue;
 177                 /* we found CDE! */
 178                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 179                 FIX_ENDIANNESS_CDE(cde_header);
 180                 return cde_header.formatted.cds_offset;
 181         }
 182         bb_error_msg_and_die("can't find file table");
 183 };
 184
 185 static uint32_t read_next_cds(int count_m1, uint32_t cds_offset, cds_header_t *cds_ptr)
 186 {
 187         off_t org;
 188
 189         org = xlseek(zip_fd, 0, SEEK_CUR);
 190
 191         if (!cds_offset)
 192                 cds_offset = find_cds_offset();
 193
 194         while (count_m1-- >= 0) {
 195                 xlseek(zip_fd, cds_offset + 4, SEEK_SET);
 196                 xread(zip_fd, cds_ptr->raw, CDS_HEADER_LEN);
 197                 FIX_ENDIANNESS_CDS(*cds_ptr);
 198                 cds_offset += 4 + CDS_HEADER_LEN
 199                         + cds_ptr->formatted.file_name_length
 200                         + cds_ptr->formatted.extra_field_length
 201                         + cds_ptr->formatted.file_comment_length;
 202         }
 203
 204         xlseek(zip_fd, org, SEEK_SET);
 205         return cds_offset;
 206 };
 207 #endif
 208
 209 static void unzip_skip(off_t skip)
 210 {
 211         if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 212                 bb_copyfd_exact_size(zip_fd, -1, skip);
 213 }
 214
 215 static void unzip_create_leading_dirs(const char *fn)
 216 {
 217         /* Create all leading directories */
 218         char *name = xstrdup(fn);
 219         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 220                 bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
 221         }
 222         free(name);
 223 }
 224
 225 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 226 {
 227         if (zip_header->formatted.method == 0) {
 228                 /* Method 0 - stored (not compressed) */
 229                 off_t size = zip_header->formatted.ucmpsize;
 230                 if (size)
 231                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 232         } else {
 233                 /* Method 8 - inflate */
 234                 inflate_unzip_result res;
 235                 if (inflate_unzip(&res, zip_header->formatted.cmpsize, zip_fd, dst_fd) < 0)
 236                         bb_error_msg_and_die("inflate error");
 237                 /* Validate decompression - crc */
 238                 if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
 239                         bb_error_msg_and_die("crc error");
 240                 }
 241                 /* Validate decompression - size */
 242                 if (zip_header->formatted.ucmpsize != res.bytes_out) {
 243                         /* Don't die. Who knows, maybe len calculation
 244                          * was botched somewhere. After all, crc matched! */
 245                         bb_error_msg("bad length");
 246                 }
 247         }
 248 }
 249
 250 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 251 int unzip_main(int argc, char **argv)
 252 {
 253         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 254
 255         zip_header_t zip_header;
 256         smallint quiet = 0;
 257         IF_NOT_DESKTOP(const) smallint verbose = 0;
 258         smallint listing = 0;
 259         smallint overwrite = O_PROMPT;
 260 #if ENABLE_DESKTOP
 261         uint32_t cds_offset;
 262         unsigned cds_entries;
 263 #endif
 264         unsigned long total_usize;
 265         unsigned long total_size;
 266         unsigned total_entries;
 267         int dst_fd = -1;
 268         char *src_fn = NULL;
 269         char *dst_fn = NULL;
 270         llist_t *zaccept = NULL;
 271         llist_t *zreject = NULL;
 272         char *base_dir = NULL;
 273         int i, opt;
 274         int opt_range = 0;
 275         char key_buf[80];
 276         struct stat stat_buf;
 277
 278 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 279  *
 280  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 281  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 282  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 283  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 284  * --------  ------  ------- -----   ----   ----   ------    ----
 285  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 286  * --------          -------  ---                            -------
 287  *   204372            35278  83%                            1 file
 288  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 289  * Archive:  decompress_unlzma.i.zip
 290  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 291  * --------  ------  ------- -----   ----   ----   ------    ----
 292  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 293  * --------          -------  ---                            -------
 294  *   204372            35278  83%                            1 file
 295  * # unzip -v decompress_unlzma.i.zip
 296  * Archive:  decompress_unlzma.i.zip
 297  *   Length     Date   Time    Name
 298  *  --------    ----   ----    ----
 299  *    204372  09-06-09 14:23   decompress_unlzma.i
 300  *  --------                   -------
 301  *    204372                   1 files
 302  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 303  *    204372  09-06-09 14:23   decompress_unlzma.i
 304  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 305  *   Length     Date   Time    Name
 306  *  --------    ----   ----    ----
 307  *    204372  09-06-09 14:23   decompress_unlzma.i
 308  *  --------                   -------
 309  *    204372                   1 file
 310  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 311  * Archive:  decompress_unlzma.i.zip
 312  *   Length     Date   Time    Name
 313  *  --------    ----   ----    ----
 314  *    204372  09-06-09 14:23   decompress_unlzma.i
 315  *  --------                   -------
 316  *    204372                   1 file
 317  */
 318
 319         /* '-' makes getopt return 1 for non-options */
 320         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 321                 switch (opt_range) {
 322                 case 0: /* Options */
 323                         switch (opt) {
 324                         case 'l': /* List */
 325                                 listing = 1;
 326                                 break;
 327
 328                         case 'n': /* Never overwrite existing files */
 329                                 overwrite = O_NEVER;
 330                                 break;
 331
 332                         case 'o': /* Always overwrite existing files */
 333                                 overwrite = O_ALWAYS;
 334                                 break;
 335
 336                         case 'p': /* Extract files to stdout and fall through to set verbosity */
 337                                 dst_fd = STDOUT_FILENO;
 338
 339                         case 'q': /* Be quiet */
 340                                 quiet++;
 341                                 break;
 342
 343                         case 'v': /* Verbose list */
 344                                 IF_DESKTOP(verbose++;)
 345                                 listing = 1;
 346                                 break;
 347
 348                         case 1: /* The zip file */
 349                                 /* +5: space for ".zip" and NUL */
 350                                 src_fn = xmalloc(strlen(optarg) + 5);
 351                                 strcpy(src_fn, optarg);
 352                                 opt_range++;
 353                                 break;
 354
 355                         default:
 356                                 bb_show_usage();
 357
 358                         }
 359                         break;
 360
 361                 case 1: /* Include files */
 362                         if (opt == 1) {
 363                                 llist_add_to(&zaccept, optarg);
 364                                 break;
 365                         }
 366                         if (opt == 'd') {
 367                                 base_dir = optarg;
 368                                 opt_range += 2;
 369                                 break;
 370                         }
 371                         if (opt == 'x') {
 372                                 opt_range++;
 373                                 break;
 374                         }
 375                         bb_show_usage();
 376
 377                 case 2 : /* Exclude files */
 378                         if (opt == 1) {
 379                                 llist_add_to(&zreject, optarg);
 380                                 break;
 381                         }
 382                         if (opt == 'd') { /* Extract to base directory */
 383                                 base_dir = optarg;
 384                                 opt_range++;
 385                                 break;
 386                         }
 387                         /* fall through */
 388
 389                 default:
 390                         bb_show_usage();
 391                 }
 392         }
 393
 394         if (src_fn == NULL) {
 395                 bb_show_usage();
 396         }
 397
 398         /* Open input file */
 399         if (LONE_DASH(src_fn)) {
 400                 xdup2(STDIN_FILENO, zip_fd);
 401                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 402                 if (overwrite == O_PROMPT)
 403                         overwrite = O_NEVER;
 404         } else {
 405                 static const char extn[][5] = {"", ".zip", ".ZIP"};
 406                 int orig_src_fn_len = strlen(src_fn);
 407                 int src_fd = -1;
 408
 409                 for (i = 0; (i < 3) && (src_fd == -1); i++) {
 410                         strcpy(src_fn + orig_src_fn_len, extn[i]);
 411                         src_fd = open(src_fn, O_RDONLY);
 412                 }
 413                 if (src_fd == -1) {
 414                         src_fn[orig_src_fn_len] = '\0';
 415                         bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
 416                 }
 417                 xmove_fd(src_fd, zip_fd);
 418         }
 419
 420         /* Change dir if necessary */
 421         if (base_dir)
 422                 xchdir(base_dir);
 423
 424         if (quiet <= 1) { /* not -qq */
 425                 if (quiet == 0)
 426                         printf("Archive:  %s\n", src_fn);
 427                 if (listing) {
 428                         puts(verbose ?
 429                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 430                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 431                                 :
 432                                 "  Length     Date   Time    Name\n"
 433                                 " --------    ----   ----    ----"
 434                                 );
 435                 }
 436         }
 437
 438         total_usize = 0;
 439         total_size = 0;
 440         total_entries = 0;
 441 #if ENABLE_DESKTOP
 442         cds_entries = 0;
 443         cds_offset = 0;
 444 #endif
 445         while (1) {
 446                 uint32_t magic;
 447
 448                 /* Check magic number */
 449                 xread(zip_fd, &magic, 4);
 450                 /* Central directory? It's at the end, so exit */
 451                 if (magic == ZIP_CDS_MAGIC)
 452                         break;
 453 #if ENABLE_DESKTOP
 454                 /* Data descriptor? It was a streaming file, go on */
 455                 if (magic == ZIP_DD_MAGIC) {
 456                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 457                         unzip_skip(3 * 4);
 458                         continue;
 459                 }
 460 #endif
 461                 if (magic != ZIP_FILEHEADER_MAGIC)
 462                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 463
 464                 /* Read the file header */
 465                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 466                 FIX_ENDIANNESS_ZIP(zip_header);
 467                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 468                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 469                 }
 470 #if !ENABLE_DESKTOP
 471                 if (zip_header.formatted.flags & 0x0009) {
 472                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 473                 }
 474 #else
 475                 if (zip_header.formatted.flags & 0x0001) {
 476                         /* 0x0001 - encrypted */
 477                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 478                 }
 479                 if (zip_header.formatted.flags & 0x0008) {
 480                         cds_header_t cds_header;
 481                         /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 482                          * only from Central Directory. See unzip_doc.txt */
 483                         cds_offset = read_next_cds(total_entries - cds_entries, cds_offset, &cds_header);
 484                         cds_entries = total_entries + 1;
 485                         zip_header.formatted.crc32    = cds_header.formatted.crc32;
 486                         zip_header.formatted.cmpsize  = cds_header.formatted.cmpsize;
 487                         zip_header.formatted.ucmpsize = cds_header.formatted.ucmpsize;
 488                 }
 489 #endif
 490
 491                 /* Read filename */
 492                 free(dst_fn);
 493                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 494                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 495
 496                 /* Skip extra header bytes */
 497                 unzip_skip(zip_header.formatted.extra_len);
 498
 499                 /* Filter zip entries */
 500                 if (find_list_entry(zreject, dst_fn)
 501                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 502                 ) { /* Skip entry */
 503                         i = 'n';
 504
 505                 } else { /* Extract entry */
 506                         if (listing) { /* List entry */
 507                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 508                                 if (!verbose) {
 509                                         //      "  Length     Date   Time    Name\n"
 510                                         //      " --------    ----   ----    ----"
 511                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 512                                                 (unsigned)zip_header.formatted.ucmpsize,
 513                                                 (dostime & 0x01e00000) >> 21,
 514                                                 (dostime & 0x001f0000) >> 16,
 515                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 516                                                 (dostime & 0x0000f800) >> 11,
 517                                                 (dostime & 0x000007e0) >> 5,
 518                                                 dst_fn);
 519                                         total_usize += zip_header.formatted.ucmpsize;
 520                                 } else {
 521                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 522                                         percents = percents * 100;
 523                                         if (zip_header.formatted.ucmpsize)
 524                                                 percents /= zip_header.formatted.ucmpsize;
 525                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 526                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 527                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 528                                                 (unsigned)zip_header.formatted.ucmpsize,
 529                                                 (unsigned)zip_header.formatted.cmpsize,
 530                                                 (unsigned)percents,
 531                                                 (dostime & 0x01e00000) >> 21,
 532                                                 (dostime & 0x001f0000) >> 16,
 533                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 534                                                 (dostime & 0x0000f800) >> 11,
 535                                                 (dostime & 0x000007e0) >> 5,
 536                                                 zip_header.formatted.crc32,
 537                                                 dst_fn);
 538                                         total_usize += zip_header.formatted.ucmpsize;
 539                                         total_size += zip_header.formatted.cmpsize;
 540                                 }
 541                                 i = 'n';
 542                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 543                                 i = -1;
 544                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 545                                 if (stat(dst_fn, &stat_buf) == -1) {
 546                                         if (errno != ENOENT) {
 547                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 548                                         }
 549                                         if (!quiet) {
 550                                                 printf("   creating: %s\n", dst_fn);
 551                                         }
 552                                         unzip_create_leading_dirs(dst_fn);
 553                                         if (bb_make_directory(dst_fn, 0777, 0)) {
 554                                                 bb_error_msg_and_die("exiting");
 555                                         }
 556                                 } else {
 557                                         if (!S_ISDIR(stat_buf.st_mode)) {
 558                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 559                                         }
 560                                 }
 561                                 i = 'n';
 562
 563                         } else {  /* Extract file */
 564  check_file:
 565                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 566                                         if (errno != ENOENT) {
 567                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 568                                         }
 569                                         i = 'y';
 570                                 } else { /* File already exists */
 571                                         if (overwrite == O_NEVER) {
 572                                                 i = 'n';
 573                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 574                                                 if (overwrite == O_ALWAYS) {
 575                                                         i = 'y';
 576                                                 } else {
 577                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 578                                                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 579                                                                 bb_perror_msg_and_die("can't read input");
 580                                                         }
 581                                                         i = key_buf[0];
 582                                                 }
 583                                         } else { /* File is not regular file */
 584                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 585                                         }
 586                                 }
 587                         }
 588                 }
 589
 590                 switch (i) {
 591                 case 'A':
 592                         overwrite = O_ALWAYS;
 593                 case 'y': /* Open file and fall into unzip */
 594                         unzip_create_leading_dirs(dst_fn);
 595                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 596                 case -1: /* Unzip */
 597                         if (!quiet) {
 598                                 printf("  inflating: %s\n", dst_fn);
 599                         }
 600                         unzip_extract(&zip_header, dst_fd);
 601                         if (dst_fd != STDOUT_FILENO) {
 602                                 /* closing STDOUT is potentially bad for future business */
 603                                 close(dst_fd);
 604                         }
 605                         break;
 606
 607                 case 'N':
 608                         overwrite = O_NEVER;
 609                 case 'n':
 610                         /* Skip entry data */
 611                         unzip_skip(zip_header.formatted.cmpsize);
 612                         break;
 613
 614                 case 'r':
 615                         /* Prompt for new name */
 616                         printf("new name: ");
 617                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 618                                 bb_perror_msg_and_die("can't read input");
 619                         }
 620                         free(dst_fn);
 621                         dst_fn = xstrdup(key_buf);
 622                         chomp(dst_fn);
 623                         goto check_file;
 624
 625                 default:
 626                         printf("error: invalid response [%c]\n", (char)i);
 627                         goto check_file;
 628                 }
 629
 630                 total_entries++;
 631         }
 632
 633         if (listing && quiet <= 1) {
 634                 if (!verbose) {
 635                         //      "  Length     Date   Time    Name\n"
 636                         //      " --------    ----   ----    ----"
 637                         printf( " --------                   -------\n"
 638                                 "%9lu"   "                   %u files\n",
 639                                 total_usize, total_entries);
 640                 } else {
 641                         unsigned long percents = total_usize - total_size;
 642                         percents = percents * 100;
 643                         if (total_usize)
 644                                 percents /= total_usize;
 645                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 646                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 647                         printf( "--------          -------  ---                            -------\n"
 648                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 649                                 total_usize, total_size, (unsigned)percents,
 650                                 total_entries);
 651                 }
 652         }
 653
 654         return 0;
 655 }