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 //usage:#define unzip_trivial_usage
  23 //usage:       "[-opts[modifiers]] FILE[.zip] [LIST] [-x XLIST] [-d DIR]"
  24 //usage:#define unzip_full_usage "\n\n"
  25 //usage:       "Extract files from ZIP archives\n"
  26 //usage:     "\nOptions:"
  27 //usage:     "\n        -l      List archive contents (with -q for short form)"
  28 //usage:     "\n        -n      Never overwrite files (default)"
  29 //usage:     "\n        -o      Overwrite"
  30 //usage:     "\n        -p      Send output to stdout"
  31 //usage:     "\n        -q      Quiet"
  32 //usage:     "\n        -x XLST Exclude these files"
  33 //usage:     "\n        -d DIR  Extract files into DIR"
  34
  35 #include "libbb.h"
  36 #include "archive.h"
  37
  38 enum {
  39 #if BB_BIG_ENDIAN
  40         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  41         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  42         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  43         ZIP_DD_MAGIC         = 0x504b0708,
  44 #else
  45         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  46         ZIP_CDF_MAGIC        = 0x02014b50,
  47         ZIP_CDE_MAGIC        = 0x06054b50,
  48         ZIP_DD_MAGIC         = 0x08074b50,
  49 #endif
  50 };
  51
  52 #define ZIP_HEADER_LEN 26
  53
  54 typedef union {
  55         uint8_t raw[ZIP_HEADER_LEN];
  56         struct {
  57                 uint16_t version;               /* 0-1 */
  58                 uint16_t zip_flags;             /* 2-3 */
  59                 uint16_t method;                /* 4-5 */
  60                 uint16_t modtime;               /* 6-7 */
  61                 uint16_t moddate;               /* 8-9 */
  62                 uint32_t crc32 PACKED;          /* 10-13 */
  63                 uint32_t cmpsize PACKED;        /* 14-17 */
  64                 uint32_t ucmpsize PACKED;       /* 18-21 */
  65                 uint16_t filename_len;          /* 22-23 */
  66                 uint16_t extra_len;             /* 24-25 */
  67         } formatted PACKED;
  68 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  69
  70 /* Check the offset of the last element, not the length.  This leniency
  71  * allows for poor packing, whereby the overall struct may be too long,
  72  * even though the elements are all in the right place.
  73  */
  74 struct BUG_zip_header_must_be_26_bytes {
  75         char BUG_zip_header_must_be_26_bytes[
  76                 offsetof(zip_header_t, formatted.extra_len) + 2
  77                         == ZIP_HEADER_LEN ? 1 : -1];
  78 };
  79
  80 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  81         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  82         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  83         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  84         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  85         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  86         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  87         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  88         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  89         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  90 } while (0)
  91
  92 #define CDF_HEADER_LEN 42
  93
  94 typedef union {
  95         uint8_t raw[CDF_HEADER_LEN];
  96         struct {
  97                 /* uint32_t signature; 50 4b 01 02 */
  98                 uint16_t version_made_by;       /* 0-1 */
  99                 uint16_t version_needed;        /* 2-3 */
 100                 uint16_t cdf_flags;             /* 4-5 */
 101                 uint16_t method;                /* 6-7 */
 102                 uint16_t mtime;                 /* 8-9 */
 103                 uint16_t mdate;                 /* 10-11 */
 104                 uint32_t crc32;                 /* 12-15 */
 105                 uint32_t cmpsize;               /* 16-19 */
 106                 uint32_t ucmpsize;              /* 20-23 */
 107                 uint16_t file_name_length;      /* 24-25 */
 108                 uint16_t extra_field_length;    /* 26-27 */
 109                 uint16_t file_comment_length;   /* 28-29 */
 110                 uint16_t disk_number_start;     /* 30-31 */
 111                 uint16_t internal_file_attributes; /* 32-33 */
 112                 uint32_t external_file_attributes PACKED; /* 34-37 */
 113                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 114         } formatted PACKED;
 115 } cdf_header_t;
 116
 117 struct BUG_cdf_header_must_be_42_bytes {
 118         char BUG_cdf_header_must_be_42_bytes[
 119                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 120                         == CDF_HEADER_LEN ? 1 : -1];
 121 };
 122
 123 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 124         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 125         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 126         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 127         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 128         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 129         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 130         IF_DESKTOP( \
 131         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 132         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 133         ) \
 134 } while (0)
 135
 136 #define CDE_HEADER_LEN 16
 137
 138 typedef union {
 139         uint8_t raw[CDE_HEADER_LEN];
 140         struct {
 141                 /* uint32_t signature; 50 4b 05 06 */
 142                 uint16_t this_disk_no;
 143                 uint16_t disk_with_cdf_no;
 144                 uint16_t cdf_entries_on_this_disk;
 145                 uint16_t cdf_entries_total;
 146                 uint32_t cdf_size;
 147                 uint32_t cdf_offset;
 148                 /* uint16_t file_comment_length; */
 149                 /* .ZIP file comment (variable size) */
 150         } formatted PACKED;
 151 } cde_header_t;
 152
 153 struct BUG_cde_header_must_be_16_bytes {
 154         char BUG_cde_header_must_be_16_bytes[
 155                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 156 };
 157
 158 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 159         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 160 } while (0)
 161
 162 enum { zip_fd = 3 };
 163
 164
 165 #if ENABLE_DESKTOP
 166
 167 #define PEEK_FROM_END 16384
 168
 169 /* NB: does not preserve file position! */
 170 static uint32_t find_cdf_offset(void)
 171 {
 172         cde_header_t cde_header;
 173         unsigned char *p;
 174         off_t end;
 175         unsigned char *buf = xzalloc(PEEK_FROM_END);
 176
 177         end = xlseek(zip_fd, 0, SEEK_END);
 178         end -= PEEK_FROM_END;
 179         if (end < 0)
 180                 end = 0;
 181         xlseek(zip_fd, end, SEEK_SET);
 182         full_read(zip_fd, buf, PEEK_FROM_END);
 183
 184         p = buf;
 185         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 186                 if (*p != 'P') {
 187                         p++;
 188                         continue;
 189                 }
 190                 if (*++p != 'K')
 191                         continue;
 192                 if (*++p != 5)
 193                         continue;
 194                 if (*++p != 6)
 195                         continue;
 196                 /* we found CDE! */
 197                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 198                 FIX_ENDIANNESS_CDE(cde_header);
 199                 free(buf);
 200                 return cde_header.formatted.cdf_offset;
 201         }
 202         //free(buf);
 203         bb_error_msg_and_die("can't find file table");
 204 };
 205
 206 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 207 {
 208         off_t org;
 209
 210         org = xlseek(zip_fd, 0, SEEK_CUR);
 211
 212         if (!cdf_offset)
 213                 cdf_offset = find_cdf_offset();
 214
 215         xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 216         xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 217         FIX_ENDIANNESS_CDF(*cdf_ptr);
 218         cdf_offset += 4 + CDF_HEADER_LEN
 219                 + cdf_ptr->formatted.file_name_length
 220                 + cdf_ptr->formatted.extra_field_length
 221                 + cdf_ptr->formatted.file_comment_length;
 222
 223         xlseek(zip_fd, org, SEEK_SET);
 224         return cdf_offset;
 225 };
 226 #endif
 227
 228 static void unzip_skip(off_t skip)
 229 {
 230         if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 231                 bb_copyfd_exact_size(zip_fd, -1, skip);
 232 }
 233
 234 static void unzip_create_leading_dirs(const char *fn)
 235 {
 236         /* Create all leading directories */
 237         char *name = xstrdup(fn);
 238         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 239                 bb_error_msg_and_die("exiting"); /* bb_make_directory is noisy */
 240         }
 241         free(name);
 242 }
 243
 244 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 245 {
 246         if (zip_header->formatted.method == 0) {
 247                 /* Method 0 - stored (not compressed) */
 248                 off_t size = zip_header->formatted.ucmpsize;
 249                 if (size)
 250                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 251         } else {
 252                 /* Method 8 - inflate */
 253                 inflate_unzip_result res;
 254                 if (inflate_unzip(&res, zip_header->formatted.cmpsize, zip_fd, dst_fd) < 0)
 255                         bb_error_msg_and_die("inflate error");
 256                 /* Validate decompression - crc */
 257                 if (zip_header->formatted.crc32 != (res.crc ^ 0xffffffffL)) {
 258                         bb_error_msg_and_die("crc error");
 259                 }
 260                 /* Validate decompression - size */
 261                 if (zip_header->formatted.ucmpsize != res.bytes_out) {
 262                         /* Don't die. Who knows, maybe len calculation
 263                          * was botched somewhere. After all, crc matched! */
 264                         bb_error_msg("bad length");
 265                 }
 266         }
 267 }
 268
 269 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 270 int unzip_main(int argc, char **argv)
 271 {
 272         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 273
 274         zip_header_t zip_header;
 275         smallint quiet = 0;
 276         IF_NOT_DESKTOP(const) smallint verbose = 0;
 277         smallint listing = 0;
 278         smallint overwrite = O_PROMPT;
 279 #if ENABLE_DESKTOP
 280         uint32_t cdf_offset;
 281 #endif
 282         unsigned long total_usize;
 283         unsigned long total_size;
 284         unsigned total_entries;
 285         int dst_fd = -1;
 286         char *src_fn = NULL;
 287         char *dst_fn = NULL;
 288         llist_t *zaccept = NULL;
 289         llist_t *zreject = NULL;
 290         char *base_dir = NULL;
 291         int i, opt;
 292         int opt_range = 0;
 293         char key_buf[80];
 294         struct stat stat_buf;
 295
 296 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 297  *
 298  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 299  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 300  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 301  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 302  * --------  ------  ------- -----   ----   ----   ------    ----
 303  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 304  * --------          -------  ---                            -------
 305  *   204372            35278  83%                            1 file
 306  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 307  * Archive:  decompress_unlzma.i.zip
 308  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 309  * --------  ------  ------- -----   ----   ----   ------    ----
 310  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 311  * --------          -------  ---                            -------
 312  *   204372            35278  83%                            1 file
 313  * # unzip -v decompress_unlzma.i.zip
 314  * Archive:  decompress_unlzma.i.zip
 315  *   Length     Date   Time    Name
 316  *  --------    ----   ----    ----
 317  *    204372  09-06-09 14:23   decompress_unlzma.i
 318  *  --------                   -------
 319  *    204372                   1 files
 320  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 321  *    204372  09-06-09 14:23   decompress_unlzma.i
 322  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 323  *   Length     Date   Time    Name
 324  *  --------    ----   ----    ----
 325  *    204372  09-06-09 14:23   decompress_unlzma.i
 326  *  --------                   -------
 327  *    204372                   1 file
 328  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 329  * Archive:  decompress_unlzma.i.zip
 330  *   Length     Date   Time    Name
 331  *  --------    ----   ----    ----
 332  *    204372  09-06-09 14:23   decompress_unlzma.i
 333  *  --------                   -------
 334  *    204372                   1 file
 335  */
 336
 337         /* '-' makes getopt return 1 for non-options */
 338         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 339                 switch (opt_range) {
 340                 case 0: /* Options */
 341                         switch (opt) {
 342                         case 'l': /* List */
 343                                 listing = 1;
 344                                 break;
 345
 346                         case 'n': /* Never overwrite existing files */
 347                                 overwrite = O_NEVER;
 348                                 break;
 349
 350                         case 'o': /* Always overwrite existing files */
 351                                 overwrite = O_ALWAYS;
 352                                 break;
 353
 354                         case 'p': /* Extract files to stdout and fall through to set verbosity */
 355                                 dst_fd = STDOUT_FILENO;
 356
 357                         case 'q': /* Be quiet */
 358                                 quiet++;
 359                                 break;
 360
 361                         case 'v': /* Verbose list */
 362                                 IF_DESKTOP(verbose++;)
 363                                 listing = 1;
 364                                 break;
 365
 366                         case 1: /* The zip file */
 367                                 /* +5: space for ".zip" and NUL */
 368                                 src_fn = xmalloc(strlen(optarg) + 5);
 369                                 strcpy(src_fn, optarg);
 370                                 opt_range++;
 371                                 break;
 372
 373                         default:
 374                                 bb_show_usage();
 375                         }
 376                         break;
 377
 378                 case 1: /* Include files */
 379                         if (opt == 1) {
 380                                 llist_add_to(&zaccept, optarg);
 381                                 break;
 382                         }
 383                         if (opt == 'd') {
 384                                 base_dir = optarg;
 385                                 opt_range += 2;
 386                                 break;
 387                         }
 388                         if (opt == 'x') {
 389                                 opt_range++;
 390                                 break;
 391                         }
 392                         bb_show_usage();
 393
 394                 case 2 : /* Exclude files */
 395                         if (opt == 1) {
 396                                 llist_add_to(&zreject, optarg);
 397                                 break;
 398                         }
 399                         if (opt == 'd') { /* Extract to base directory */
 400                                 base_dir = optarg;
 401                                 opt_range++;
 402                                 break;
 403                         }
 404                         /* fall through */
 405
 406                 default:
 407                         bb_show_usage();
 408                 }
 409         }
 410
 411         if (src_fn == NULL) {
 412                 bb_show_usage();
 413         }
 414
 415         /* Open input file */
 416         if (LONE_DASH(src_fn)) {
 417                 xdup2(STDIN_FILENO, zip_fd);
 418                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 419                 if (overwrite == O_PROMPT)
 420                         overwrite = O_NEVER;
 421         } else {
 422                 static const char extn[][5] = {"", ".zip", ".ZIP"};
 423                 int orig_src_fn_len = strlen(src_fn);
 424                 int src_fd = -1;
 425
 426                 for (i = 0; (i < 3) && (src_fd == -1); i++) {
 427                         strcpy(src_fn + orig_src_fn_len, extn[i]);
 428                         src_fd = open(src_fn, O_RDONLY);
 429                 }
 430                 if (src_fd == -1) {
 431                         src_fn[orig_src_fn_len] = '\0';
 432                         bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
 433                 }
 434                 xmove_fd(src_fd, zip_fd);
 435         }
 436
 437         /* Change dir if necessary */
 438         if (base_dir)
 439                 xchdir(base_dir);
 440
 441         if (quiet <= 1) { /* not -qq */
 442                 if (quiet == 0)
 443                         printf("Archive:  %s\n", src_fn);
 444                 if (listing) {
 445                         puts(verbose ?
 446                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 447                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 448                                 :
 449                                 "  Length     Date   Time    Name\n"
 450                                 " --------    ----   ----    ----"
 451                                 );
 452                 }
 453         }
 454
 455 /* Example of an archive with one 0-byte long file named 'z'
 456  * created by Zip 2.31 on Unix:
 457  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 458  *       sig........ vneed flags compr mtime mdate crc32>
 459  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 460  *      >..... csize...... usize...... fnlen exlen fn ex>
 461  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 462  *      >tra_field......................................
 463  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 464  *       ........... sig........ vmade vneed flags compr
 465  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 466  *       mtime mdate crc32...... csize...... usize......
 467  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 468  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 469  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 470  *      >..... fn extra_field...........................
 471  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 472  * 0080  34 00 00 00 00 00                               |4.....|
 473  */
 474         total_usize = 0;
 475         total_size = 0;
 476         total_entries = 0;
 477 #if ENABLE_DESKTOP
 478         cdf_offset = 0;
 479 #endif
 480         while (1) {
 481                 uint32_t magic;
 482                 mode_t dir_mode = 0777;
 483 #if ENABLE_DESKTOP
 484                 mode_t file_mode = 0666;
 485 #endif
 486
 487                 /* Check magic number */
 488                 xread(zip_fd, &magic, 4);
 489                 /* Central directory? It's at the end, so exit */
 490                 if (magic == ZIP_CDF_MAGIC)
 491                         break;
 492 #if ENABLE_DESKTOP
 493                 /* Data descriptor? It was a streaming file, go on */
 494                 if (magic == ZIP_DD_MAGIC) {
 495                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 496                         unzip_skip(3 * 4);
 497                         continue;
 498                 }
 499 #endif
 500                 if (magic != ZIP_FILEHEADER_MAGIC)
 501                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 502
 503                 /* Read the file header */
 504                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 505                 FIX_ENDIANNESS_ZIP(zip_header);
 506                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 507                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 508                 }
 509 #if !ENABLE_DESKTOP
 510                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 511                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 512                 }
 513 #else
 514                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 515                         /* 0x0001 - encrypted */
 516                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 517                 }
 518
 519                 {
 520                         cdf_header_t cdf_header;
 521                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 522                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 523                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 524                                  * only from Central Directory. See unzip_doc.txt */
 525                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 526                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 527                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 528                         }
 529                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 530                                 /* this archive is created on Unix */
 531                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 532                         }
 533                 }
 534 #endif
 535
 536                 /* Read filename */
 537                 free(dst_fn);
 538                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 539                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 540
 541                 /* Skip extra header bytes */
 542                 unzip_skip(zip_header.formatted.extra_len);
 543
 544                 /* Filter zip entries */
 545                 if (find_list_entry(zreject, dst_fn)
 546                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 547                 ) { /* Skip entry */
 548                         i = 'n';
 549
 550                 } else { /* Extract entry */
 551                         if (listing) { /* List entry */
 552                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 553                                 if (!verbose) {
 554                                         //      "  Length     Date   Time    Name\n"
 555                                         //      " --------    ----   ----    ----"
 556                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 557                                                 (unsigned)zip_header.formatted.ucmpsize,
 558                                                 (dostime & 0x01e00000) >> 21,
 559                                                 (dostime & 0x001f0000) >> 16,
 560                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 561                                                 (dostime & 0x0000f800) >> 11,
 562                                                 (dostime & 0x000007e0) >> 5,
 563                                                 dst_fn);
 564                                         total_usize += zip_header.formatted.ucmpsize;
 565                                 } else {
 566                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 567                                         percents = percents * 100;
 568                                         if (zip_header.formatted.ucmpsize)
 569                                                 percents /= zip_header.formatted.ucmpsize;
 570                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 571                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 572                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 573                                                 (unsigned)zip_header.formatted.ucmpsize,
 574                                                 (unsigned)zip_header.formatted.cmpsize,
 575                                                 (unsigned)percents,
 576                                                 (dostime & 0x01e00000) >> 21,
 577                                                 (dostime & 0x001f0000) >> 16,
 578                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 579                                                 (dostime & 0x0000f800) >> 11,
 580                                                 (dostime & 0x000007e0) >> 5,
 581                                                 zip_header.formatted.crc32,
 582                                                 dst_fn);
 583                                         total_usize += zip_header.formatted.ucmpsize;
 584                                         total_size += zip_header.formatted.cmpsize;
 585                                 }
 586                                 i = 'n';
 587                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 588                                 i = -1;
 589                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 590                                 if (stat(dst_fn, &stat_buf) == -1) {
 591                                         if (errno != ENOENT) {
 592                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 593                                         }
 594                                         if (!quiet) {
 595                                                 printf("   creating: %s\n", dst_fn);
 596                                         }
 597                                         unzip_create_leading_dirs(dst_fn);
 598                                         if (bb_make_directory(dst_fn, dir_mode, 0)) {
 599                                                 bb_error_msg_and_die("exiting");
 600                                         }
 601                                 } else {
 602                                         if (!S_ISDIR(stat_buf.st_mode)) {
 603                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 604                                         }
 605                                 }
 606                                 i = 'n';
 607
 608                         } else {  /* Extract file */
 609  check_file:
 610                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 611                                         if (errno != ENOENT) {
 612                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 613                                         }
 614                                         i = 'y';
 615                                 } else { /* File already exists */
 616                                         if (overwrite == O_NEVER) {
 617                                                 i = 'n';
 618                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 619                                                 if (overwrite == O_ALWAYS) {
 620                                                         i = 'y';
 621                                                 } else {
 622                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 623                                                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 624                                                                 bb_perror_msg_and_die("can't read input");
 625                                                         }
 626                                                         i = key_buf[0];
 627                                                 }
 628                                         } else { /* File is not regular file */
 629                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 630                                         }
 631                                 }
 632                         }
 633                 }
 634
 635                 switch (i) {
 636                 case 'A':
 637                         overwrite = O_ALWAYS;
 638                 case 'y': /* Open file and fall into unzip */
 639                         unzip_create_leading_dirs(dst_fn);
 640 #if ENABLE_DESKTOP
 641                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 642 #else
 643                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 644 #endif
 645                 case -1: /* Unzip */
 646                         if (!quiet) {
 647                                 printf("  inflating: %s\n", dst_fn);
 648                         }
 649                         unzip_extract(&zip_header, dst_fd);
 650                         if (dst_fd != STDOUT_FILENO) {
 651                                 /* closing STDOUT is potentially bad for future business */
 652                                 close(dst_fd);
 653                         }
 654                         break;
 655
 656                 case 'N':
 657                         overwrite = O_NEVER;
 658                 case 'n':
 659                         /* Skip entry data */
 660                         unzip_skip(zip_header.formatted.cmpsize);
 661                         break;
 662
 663                 case 'r':
 664                         /* Prompt for new name */
 665                         printf("new name: ");
 666                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 667                                 bb_perror_msg_and_die("can't read input");
 668                         }
 669                         free(dst_fn);
 670                         dst_fn = xstrdup(key_buf);
 671                         chomp(dst_fn);
 672                         goto check_file;
 673
 674                 default:
 675                         printf("error: invalid response [%c]\n", (char)i);
 676                         goto check_file;
 677                 }
 678
 679                 total_entries++;
 680         }
 681
 682         if (listing && quiet <= 1) {
 683                 if (!verbose) {
 684                         //      "  Length     Date   Time    Name\n"
 685                         //      " --------    ----   ----    ----"
 686                         printf( " --------                   -------\n"
 687                                 "%9lu"   "                   %u files\n",
 688                                 total_usize, total_entries);
 689                 } else {
 690                         unsigned long percents = total_usize - total_size;
 691                         percents = percents * 100;
 692                         if (total_usize)
 693                                 percents /= total_usize;
 694                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 695                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 696                         printf( "--------          -------  ---                            -------\n"
 697                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 698                                 total_usize, total_size, (unsigned)percents,
 699                                 total_entries);
 700                 }
 701         }
 702
 703         return 0;
 704 }