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 GPLv2 or later, see file LICENSE in this source tree.
  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 "archive.h"
  24
  25 enum {
  26 #if BB_BIG_ENDIAN
  27         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  28         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  29         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  30         ZIP_DD_MAGIC         = 0x504b0708,
  31 #else
  32         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  33         ZIP_CDF_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 zip_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.method       = SWAP_LE16((zip_header).formatted.method      ); \
  70         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  71         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  72         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  73         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  74         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  75         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  76         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  77 } while (0)
  78
  79 #define CDF_HEADER_LEN 42
  80
  81 typedef union {
  82         uint8_t raw[CDF_HEADER_LEN];
  83         struct {
  84                 /* uint32_t signature; 50 4b 01 02 */
  85                 uint16_t version_made_by;       /* 0-1 */
  86                 uint16_t version_needed;        /* 2-3 */
  87                 uint16_t cdf_flags;             /* 4-5 */
  88                 uint16_t method;                /* 6-7 */
  89                 uint16_t mtime;                 /* 8-9 */
  90                 uint16_t mdate;                 /* 10-11 */
  91                 uint32_t crc32;                 /* 12-15 */
  92                 uint32_t cmpsize;               /* 16-19 */
  93                 uint32_t ucmpsize;              /* 20-23 */
  94                 uint16_t file_name_length;      /* 24-25 */
  95                 uint16_t extra_field_length;    /* 26-27 */
  96                 uint16_t file_comment_length;   /* 28-29 */
  97                 uint16_t disk_number_start;     /* 30-31 */
  98                 uint16_t internal_file_attributes; /* 32-33 */
  99                 uint32_t external_file_attributes PACKED; /* 34-37 */
 100                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 101         } formatted PACKED;
 102 } cdf_header_t;
 103
 104 struct BUG_cdf_header_must_be_42_bytes {
 105         char BUG_cdf_header_must_be_42_bytes[
 106                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 107                         == CDF_HEADER_LEN ? 1 : -1];
 108 };
 109
 110 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 111         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 112         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 113         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 114         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 115         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 116         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 117         IF_DESKTOP( \
 118         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 119         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 120         ) \
 121 } while (0)
 122
 123 #define CDE_HEADER_LEN 16
 124
 125 typedef union {
 126         uint8_t raw[CDE_HEADER_LEN];
 127         struct {
 128                 /* uint32_t signature; 50 4b 05 06 */
 129                 uint16_t this_disk_no;
 130                 uint16_t disk_with_cdf_no;
 131                 uint16_t cdf_entries_on_this_disk;
 132                 uint16_t cdf_entries_total;
 133                 uint32_t cdf_size;
 134                 uint32_t cdf_offset;
 135                 /* uint16_t file_comment_length; */
 136                 /* .ZIP file comment (variable size) */
 137         } formatted PACKED;
 138 } cde_header_t;
 139
 140 struct BUG_cde_header_must_be_16_bytes {
 141         char BUG_cde_header_must_be_16_bytes[
 142                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 143 };
 144
 145 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 146         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 147 } while (0)
 148
 149 enum { zip_fd = 3 };
 150
 151
 152 #if ENABLE_DESKTOP
 153
 154 #define PEEK_FROM_END 16384
 155
 156 /* NB: does not preserve file position! */
 157 static uint32_t find_cdf_offset(void)
 158 {
 159         cde_header_t cde_header;
 160         unsigned char *p;
 161         off_t end;
 162         unsigned char *buf = xzalloc(PEEK_FROM_END);
 163
 164         end = xlseek(zip_fd, 0, SEEK_END);
 165         end -= PEEK_FROM_END;
 166         if (end < 0)
 167                 end = 0;
 168         xlseek(zip_fd, end, SEEK_SET);
 169         full_read(zip_fd, buf, PEEK_FROM_END);
 170
 171         p = buf;
 172         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 173                 if (*p != 'P') {
 174                         p++;
 175                         continue;
 176                 }
 177                 if (*++p != 'K')
 178                         continue;
 179                 if (*++p != 5)
 180                         continue;
 181                 if (*++p != 6)
 182                         continue;
 183                 /* we found CDE! */
 184                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 185                 FIX_ENDIANNESS_CDE(cde_header);
 186                 free(buf);
 187                 return cde_header.formatted.cdf_offset;
 188         }
 189         //free(buf);
 190         bb_error_msg_and_die("can't find file table");
 191 };
 192
 193 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 194 {
 195         off_t org;
 196
 197         org = xlseek(zip_fd, 0, SEEK_CUR);
 198
 199         if (!cdf_offset)
 200                 cdf_offset = find_cdf_offset();
 201
 202         xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 203         xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 204         FIX_ENDIANNESS_CDF(*cdf_ptr);
 205         cdf_offset += 4 + CDF_HEADER_LEN
 206                 + cdf_ptr->formatted.file_name_length
 207                 + cdf_ptr->formatted.extra_field_length
 208                 + cdf_ptr->formatted.file_comment_length;
 209
 210         xlseek(zip_fd, org, SEEK_SET);
 211         return cdf_offset;
 212 };
 213 #endif
 214
 215 static void unzip_skip(off_t skip)
 216 {
 217         if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 218                 bb_copyfd_exact_size(zip_fd, -1, skip);
 219 }
 220
 221 static void unzip_create_leading_dirs(const char *fn)
 222 {
 223         /* Create all leading directories */
 224         char *name = xstrdup(fn);
 225         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 226                 bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
 227         }
 228         free(name);
 229 }
 230
 231 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 232 {
 233         if (zip_header->formatted.method == 0) {
 234                 /* Method 0 - stored (not compressed) */
 235                 off_t size = zip_header->formatted.ucmpsize;
 236                 if (size)
 237                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 238         } else {
 239                 /* Method 8 - inflate */
 240                 inflate_unzip_result res;
 241                 if (inflate_unzip(&res, zip_header->formatted.cmpsize, zip_fd, dst_fd) < 0)
 242                         bb_error_msg_and_die("inflate error");
 243                 /* Validate decompression - crc */
 244                 if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
 245                         bb_error_msg_and_die("crc error");
 246                 }
 247                 /* Validate decompression - size */
 248                 if (zip_header->formatted.ucmpsize != res.bytes_out) {
 249                         /* Don't die. Who knows, maybe len calculation
 250                          * was botched somewhere. After all, crc matched! */
 251                         bb_error_msg("bad length");
 252                 }
 253         }
 254 }
 255
 256 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 257 int unzip_main(int argc, char **argv)
 258 {
 259         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 260
 261         zip_header_t zip_header;
 262         smallint quiet = 0;
 263         IF_NOT_DESKTOP(const) smallint verbose = 0;
 264         smallint listing = 0;
 265         smallint overwrite = O_PROMPT;
 266 #if ENABLE_DESKTOP
 267         uint32_t cdf_offset;
 268 #endif
 269         unsigned long total_usize;
 270         unsigned long total_size;
 271         unsigned total_entries;
 272         int dst_fd = -1;
 273         char *src_fn = NULL;
 274         char *dst_fn = NULL;
 275         llist_t *zaccept = NULL;
 276         llist_t *zreject = NULL;
 277         char *base_dir = NULL;
 278         int i, opt;
 279         int opt_range = 0;
 280         char key_buf[80];
 281         struct stat stat_buf;
 282
 283 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 284  *
 285  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 286  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 287  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 288  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 289  * --------  ------  ------- -----   ----   ----   ------    ----
 290  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 291  * --------          -------  ---                            -------
 292  *   204372            35278  83%                            1 file
 293  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 294  * Archive:  decompress_unlzma.i.zip
 295  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 296  * --------  ------  ------- -----   ----   ----   ------    ----
 297  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 298  * --------          -------  ---                            -------
 299  *   204372            35278  83%                            1 file
 300  * # unzip -v decompress_unlzma.i.zip
 301  * Archive:  decompress_unlzma.i.zip
 302  *   Length     Date   Time    Name
 303  *  --------    ----   ----    ----
 304  *    204372  09-06-09 14:23   decompress_unlzma.i
 305  *  --------                   -------
 306  *    204372                   1 files
 307  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 308  *    204372  09-06-09 14:23   decompress_unlzma.i
 309  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 310  *   Length     Date   Time    Name
 311  *  --------    ----   ----    ----
 312  *    204372  09-06-09 14:23   decompress_unlzma.i
 313  *  --------                   -------
 314  *    204372                   1 file
 315  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 316  * Archive:  decompress_unlzma.i.zip
 317  *   Length     Date   Time    Name
 318  *  --------    ----   ----    ----
 319  *    204372  09-06-09 14:23   decompress_unlzma.i
 320  *  --------                   -------
 321  *    204372                   1 file
 322  */
 323
 324         /* '-' makes getopt return 1 for non-options */
 325         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 326                 switch (opt_range) {
 327                 case 0: /* Options */
 328                         switch (opt) {
 329                         case 'l': /* List */
 330                                 listing = 1;
 331                                 break;
 332
 333                         case 'n': /* Never overwrite existing files */
 334                                 overwrite = O_NEVER;
 335                                 break;
 336
 337                         case 'o': /* Always overwrite existing files */
 338                                 overwrite = O_ALWAYS;
 339                                 break;
 340
 341                         case 'p': /* Extract files to stdout and fall through to set verbosity */
 342                                 dst_fd = STDOUT_FILENO;
 343
 344                         case 'q': /* Be quiet */
 345                                 quiet++;
 346                                 break;
 347
 348                         case 'v': /* Verbose list */
 349                                 IF_DESKTOP(verbose++;)
 350                                 listing = 1;
 351                                 break;
 352
 353                         case 1: /* The zip file */
 354                                 /* +5: space for ".zip" and NUL */
 355                                 src_fn = xmalloc(strlen(optarg) + 5);
 356                                 strcpy(src_fn, optarg);
 357                                 opt_range++;
 358                                 break;
 359
 360                         default:
 361                                 bb_show_usage();
 362                         }
 363                         break;
 364
 365                 case 1: /* Include files */
 366                         if (opt == 1) {
 367                                 llist_add_to(&zaccept, optarg);
 368                                 break;
 369                         }
 370                         if (opt == 'd') {
 371                                 base_dir = optarg;
 372                                 opt_range += 2;
 373                                 break;
 374                         }
 375                         if (opt == 'x') {
 376                                 opt_range++;
 377                                 break;
 378                         }
 379                         bb_show_usage();
 380
 381                 case 2 : /* Exclude files */
 382                         if (opt == 1) {
 383                                 llist_add_to(&zreject, optarg);
 384                                 break;
 385                         }
 386                         if (opt == 'd') { /* Extract to base directory */
 387                                 base_dir = optarg;
 388                                 opt_range++;
 389                                 break;
 390                         }
 391                         /* fall through */
 392
 393                 default:
 394                         bb_show_usage();
 395                 }
 396         }
 397
 398         if (src_fn == NULL) {
 399                 bb_show_usage();
 400         }
 401
 402         /* Open input file */
 403         if (LONE_DASH(src_fn)) {
 404                 xdup2(STDIN_FILENO, zip_fd);
 405                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 406                 if (overwrite == O_PROMPT)
 407                         overwrite = O_NEVER;
 408         } else {
 409                 static const char extn[][5] = {"", ".zip", ".ZIP"};
 410                 int orig_src_fn_len = strlen(src_fn);
 411                 int src_fd = -1;
 412
 413                 for (i = 0; (i < 3) && (src_fd == -1); i++) {
 414                         strcpy(src_fn + orig_src_fn_len, extn[i]);
 415                         src_fd = open(src_fn, O_RDONLY);
 416                 }
 417                 if (src_fd == -1) {
 418                         src_fn[orig_src_fn_len] = '\0';
 419                         bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
 420                 }
 421                 xmove_fd(src_fd, zip_fd);
 422         }
 423
 424         /* Change dir if necessary */
 425         if (base_dir)
 426                 xchdir(base_dir);
 427
 428         if (quiet <= 1) { /* not -qq */
 429                 if (quiet == 0)
 430                         printf("Archive:  %s\n", src_fn);
 431                 if (listing) {
 432                         puts(verbose ?
 433                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 434                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 435                                 :
 436                                 "  Length     Date   Time    Name\n"
 437                                 " --------    ----   ----    ----"
 438                                 );
 439                 }
 440         }
 441
 442 /* Example of an archive with one 0-byte long file named 'z'
 443  * created by Zip 2.31 on Unix:
 444  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 445  *       sig........ vneed flags compr mtime mdate crc32>
 446  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 447  *      >..... csize...... usize...... fnlen exlen fn ex>
 448  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 449  *      >tra_field......................................
 450  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 451  *       ........... sig........ vmade vneed flags compr
 452  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 453  *       mtime mdate crc32...... csize...... usize......
 454  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 455  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 456  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 457  *      >..... fn extra_field...........................
 458  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 459  * 0080  34 00 00 00 00 00                               |4.....|
 460  */
 461         total_usize = 0;
 462         total_size = 0;
 463         total_entries = 0;
 464 #if ENABLE_DESKTOP
 465         cdf_offset = 0;
 466 #endif
 467         while (1) {
 468                 uint32_t magic;
 469                 mode_t dir_mode = 0777;
 470 #if ENABLE_DESKTOP
 471                 mode_t file_mode = 0666;
 472 #endif
 473
 474                 /* Check magic number */
 475                 xread(zip_fd, &magic, 4);
 476                 /* Central directory? It's at the end, so exit */
 477                 if (magic == ZIP_CDF_MAGIC)
 478                         break;
 479 #if ENABLE_DESKTOP
 480                 /* Data descriptor? It was a streaming file, go on */
 481                 if (magic == ZIP_DD_MAGIC) {
 482                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 483                         unzip_skip(3 * 4);
 484                         continue;
 485                 }
 486 #endif
 487                 if (magic != ZIP_FILEHEADER_MAGIC)
 488                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 489
 490                 /* Read the file header */
 491                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 492                 FIX_ENDIANNESS_ZIP(zip_header);
 493                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 494                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 495                 }
 496 #if !ENABLE_DESKTOP
 497                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 498                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 499                 }
 500 #else
 501                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 502                         /* 0x0001 - encrypted */
 503                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 504                 }
 505
 506                 {
 507                         cdf_header_t cdf_header;
 508                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 509                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 510                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 511                                  * only from Central Directory. See unzip_doc.txt */
 512                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 513                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 514                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 515                         }
 516                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 517                                 /* this archive is created on Unix */
 518                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 519                         }
 520                 }
 521 #endif
 522
 523                 /* Read filename */
 524                 free(dst_fn);
 525                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 526                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 527
 528                 /* Skip extra header bytes */
 529                 unzip_skip(zip_header.formatted.extra_len);
 530
 531                 /* Filter zip entries */
 532                 if (find_list_entry(zreject, dst_fn)
 533                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 534                 ) { /* Skip entry */
 535                         i = 'n';
 536
 537                 } else { /* Extract entry */
 538                         if (listing) { /* List entry */
 539                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 540                                 if (!verbose) {
 541                                         //      "  Length     Date   Time    Name\n"
 542                                         //      " --------    ----   ----    ----"
 543                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 544                                                 (unsigned)zip_header.formatted.ucmpsize,
 545                                                 (dostime & 0x01e00000) >> 21,
 546                                                 (dostime & 0x001f0000) >> 16,
 547                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 548                                                 (dostime & 0x0000f800) >> 11,
 549                                                 (dostime & 0x000007e0) >> 5,
 550                                                 dst_fn);
 551                                         total_usize += zip_header.formatted.ucmpsize;
 552                                 } else {
 553                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 554                                         percents = percents * 100;
 555                                         if (zip_header.formatted.ucmpsize)
 556                                                 percents /= zip_header.formatted.ucmpsize;
 557                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 558                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 559                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 560                                                 (unsigned)zip_header.formatted.ucmpsize,
 561                                                 (unsigned)zip_header.formatted.cmpsize,
 562                                                 (unsigned)percents,
 563                                                 (dostime & 0x01e00000) >> 21,
 564                                                 (dostime & 0x001f0000) >> 16,
 565                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 566                                                 (dostime & 0x0000f800) >> 11,
 567                                                 (dostime & 0x000007e0) >> 5,
 568                                                 zip_header.formatted.crc32,
 569                                                 dst_fn);
 570                                         total_usize += zip_header.formatted.ucmpsize;
 571                                         total_size += zip_header.formatted.cmpsize;
 572                                 }
 573                                 i = 'n';
 574                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 575                                 i = -1;
 576                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 577                                 if (stat(dst_fn, &stat_buf) == -1) {
 578                                         if (errno != ENOENT) {
 579                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 580                                         }
 581                                         if (!quiet) {
 582                                                 printf("   creating: %s\n", dst_fn);
 583                                         }
 584                                         unzip_create_leading_dirs(dst_fn);
 585                                         if (bb_make_directory(dst_fn, dir_mode, 0)) {
 586                                                 bb_error_msg_and_die("exiting");
 587                                         }
 588                                 } else {
 589                                         if (!S_ISDIR(stat_buf.st_mode)) {
 590                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 591                                         }
 592                                 }
 593                                 i = 'n';
 594
 595                         } else {  /* Extract file */
 596  check_file:
 597                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 598                                         if (errno != ENOENT) {
 599                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 600                                         }
 601                                         i = 'y';
 602                                 } else { /* File already exists */
 603                                         if (overwrite == O_NEVER) {
 604                                                 i = 'n';
 605                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 606                                                 if (overwrite == O_ALWAYS) {
 607                                                         i = 'y';
 608                                                 } else {
 609                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 610                                                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 611                                                                 bb_perror_msg_and_die("can't read input");
 612                                                         }
 613                                                         i = key_buf[0];
 614                                                 }
 615                                         } else { /* File is not regular file */
 616                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 617                                         }
 618                                 }
 619                         }
 620                 }
 621
 622                 switch (i) {
 623                 case 'A':
 624                         overwrite = O_ALWAYS;
 625                 case 'y': /* Open file and fall into unzip */
 626                         unzip_create_leading_dirs(dst_fn);
 627 #if ENABLE_DESKTOP
 628                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 629 #else
 630                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 631 #endif
 632                 case -1: /* Unzip */
 633                         if (!quiet) {
 634                                 printf("  inflating: %s\n", dst_fn);
 635                         }
 636                         unzip_extract(&zip_header, dst_fd);
 637                         if (dst_fd != STDOUT_FILENO) {
 638                                 /* closing STDOUT is potentially bad for future business */
 639                                 close(dst_fd);
 640                         }
 641                         break;
 642
 643                 case 'N':
 644                         overwrite = O_NEVER;
 645                 case 'n':
 646                         /* Skip entry data */
 647                         unzip_skip(zip_header.formatted.cmpsize);
 648                         break;
 649
 650                 case 'r':
 651                         /* Prompt for new name */
 652                         printf("new name: ");
 653                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 654                                 bb_perror_msg_and_die("can't read input");
 655                         }
 656                         free(dst_fn);
 657                         dst_fn = xstrdup(key_buf);
 658                         chomp(dst_fn);
 659                         goto check_file;
 660
 661                 default:
 662                         printf("error: invalid response [%c]\n", (char)i);
 663                         goto check_file;
 664                 }
 665
 666                 total_entries++;
 667         }
 668
 669         if (listing && quiet <= 1) {
 670                 if (!verbose) {
 671                         //      "  Length     Date   Time    Name\n"
 672                         //      " --------    ----   ----    ----"
 673                         printf( " --------                   -------\n"
 674                                 "%9lu"   "                   %u files\n",
 675                                 total_usize, total_entries);
 676                 } else {
 677                         unsigned long percents = total_usize - total_size;
 678                         percents = percents * 100;
 679                         if (total_usize)
 680                                 percents /= total_usize;
 681                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 682                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 683                         printf( "--------          -------  ---                            -------\n"
 684                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 685                                 total_usize, total_size, (unsigned)percents,
 686                                 total_entries);
 687                 }
 688         }
 689
 690         return 0;
 691 }