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:       "[-lnopq] FILE[.zip] [FILE]... [-x FILE...] [-d DIR]"
  24 //usage:#define unzip_full_usage "\n\n"
  25 //usage:       "Extract FILEs from ZIP archive\n"
  26 //usage:     "\n        -l      List contents (with -q for short form)"
  27 //usage:     "\n        -n      Never overwrite files (default: ask)"
  28 //usage:     "\n        -o      Overwrite"
  29 //usage:     "\n        -p      Print to stdout"
  30 //usage:     "\n        -q      Quiet"
  31 //usage:     "\n        -x FILE Exclude FILEs"
  32 //usage:     "\n        -d DIR  Extract into DIR"
  33
  34 #include "libbb.h"
  35 #include "bb_archive.h"
  36
  37 enum {
  38 #if BB_BIG_ENDIAN
  39         ZIP_FILEHEADER_MAGIC = 0x504b0304,
  40         ZIP_CDF_MAGIC        = 0x504b0102, /* central directory's file header */
  41         ZIP_CDE_MAGIC        = 0x504b0506, /* "end of central directory" record */
  42         ZIP_DD_MAGIC         = 0x504b0708,
  43 #else
  44         ZIP_FILEHEADER_MAGIC = 0x04034b50,
  45         ZIP_CDF_MAGIC        = 0x02014b50,
  46         ZIP_CDE_MAGIC        = 0x06054b50,
  47         ZIP_DD_MAGIC         = 0x08074b50,
  48 #endif
  49 };
  50
  51 #define ZIP_HEADER_LEN 26
  52
  53 typedef union {
  54         uint8_t raw[ZIP_HEADER_LEN];
  55         struct {
  56                 uint16_t version;               /* 0-1 */
  57                 uint16_t zip_flags;             /* 2-3 */
  58                 uint16_t method;                /* 4-5 */
  59                 uint16_t modtime;               /* 6-7 */
  60                 uint16_t moddate;               /* 8-9 */
  61                 uint32_t crc32 PACKED;          /* 10-13 */
  62                 uint32_t cmpsize PACKED;        /* 14-17 */
  63                 uint32_t ucmpsize PACKED;       /* 18-21 */
  64                 uint16_t filename_len;          /* 22-23 */
  65                 uint16_t extra_len;             /* 24-25 */
  66         } formatted PACKED;
  67 } zip_header_t; /* PACKED - gcc 4.2.1 doesn't like it (spews warning) */
  68
  69 /* Check the offset of the last element, not the length.  This leniency
  70  * allows for poor packing, whereby the overall struct may be too long,
  71  * even though the elements are all in the right place.
  72  */
  73 struct BUG_zip_header_must_be_26_bytes {
  74         char BUG_zip_header_must_be_26_bytes[
  75                 offsetof(zip_header_t, formatted.extra_len) + 2
  76                         == ZIP_HEADER_LEN ? 1 : -1];
  77 };
  78
  79 #define FIX_ENDIANNESS_ZIP(zip_header) do { \
  80         (zip_header).formatted.version      = SWAP_LE16((zip_header).formatted.version     ); \
  81         (zip_header).formatted.method       = SWAP_LE16((zip_header).formatted.method      ); \
  82         (zip_header).formatted.modtime      = SWAP_LE16((zip_header).formatted.modtime     ); \
  83         (zip_header).formatted.moddate      = SWAP_LE16((zip_header).formatted.moddate     ); \
  84         (zip_header).formatted.crc32        = SWAP_LE32((zip_header).formatted.crc32       ); \
  85         (zip_header).formatted.cmpsize      = SWAP_LE32((zip_header).formatted.cmpsize     ); \
  86         (zip_header).formatted.ucmpsize     = SWAP_LE32((zip_header).formatted.ucmpsize    ); \
  87         (zip_header).formatted.filename_len = SWAP_LE16((zip_header).formatted.filename_len); \
  88         (zip_header).formatted.extra_len    = SWAP_LE16((zip_header).formatted.extra_len   ); \
  89 } while (0)
  90
  91 #define CDF_HEADER_LEN 42
  92
  93 typedef union {
  94         uint8_t raw[CDF_HEADER_LEN];
  95         struct {
  96                 /* uint32_t signature; 50 4b 01 02 */
  97                 uint16_t version_made_by;       /* 0-1 */
  98                 uint16_t version_needed;        /* 2-3 */
  99                 uint16_t cdf_flags;             /* 4-5 */
 100                 uint16_t method;                /* 6-7 */
 101                 uint16_t mtime;                 /* 8-9 */
 102                 uint16_t mdate;                 /* 10-11 */
 103                 uint32_t crc32;                 /* 12-15 */
 104                 uint32_t cmpsize;               /* 16-19 */
 105                 uint32_t ucmpsize;              /* 20-23 */
 106                 uint16_t file_name_length;      /* 24-25 */
 107                 uint16_t extra_field_length;    /* 26-27 */
 108                 uint16_t file_comment_length;   /* 28-29 */
 109                 uint16_t disk_number_start;     /* 30-31 */
 110                 uint16_t internal_file_attributes; /* 32-33 */
 111                 uint32_t external_file_attributes PACKED; /* 34-37 */
 112                 uint32_t relative_offset_of_local_header PACKED; /* 38-41 */
 113         } formatted PACKED;
 114 } cdf_header_t;
 115
 116 struct BUG_cdf_header_must_be_42_bytes {
 117         char BUG_cdf_header_must_be_42_bytes[
 118                 offsetof(cdf_header_t, formatted.relative_offset_of_local_header) + 4
 119                         == CDF_HEADER_LEN ? 1 : -1];
 120 };
 121
 122 #define FIX_ENDIANNESS_CDF(cdf_header) do { \
 123         (cdf_header).formatted.crc32        = SWAP_LE32((cdf_header).formatted.crc32       ); \
 124         (cdf_header).formatted.cmpsize      = SWAP_LE32((cdf_header).formatted.cmpsize     ); \
 125         (cdf_header).formatted.ucmpsize     = SWAP_LE32((cdf_header).formatted.ucmpsize    ); \
 126         (cdf_header).formatted.file_name_length = SWAP_LE16((cdf_header).formatted.file_name_length); \
 127         (cdf_header).formatted.extra_field_length = SWAP_LE16((cdf_header).formatted.extra_field_length); \
 128         (cdf_header).formatted.file_comment_length = SWAP_LE16((cdf_header).formatted.file_comment_length); \
 129         IF_DESKTOP( \
 130         (cdf_header).formatted.version_made_by = SWAP_LE16((cdf_header).formatted.version_made_by); \
 131         (cdf_header).formatted.external_file_attributes = SWAP_LE32((cdf_header).formatted.external_file_attributes); \
 132         ) \
 133 } while (0)
 134
 135 #define CDE_HEADER_LEN 16
 136
 137 typedef union {
 138         uint8_t raw[CDE_HEADER_LEN];
 139         struct {
 140                 /* uint32_t signature; 50 4b 05 06 */
 141                 uint16_t this_disk_no;
 142                 uint16_t disk_with_cdf_no;
 143                 uint16_t cdf_entries_on_this_disk;
 144                 uint16_t cdf_entries_total;
 145                 uint32_t cdf_size;
 146                 uint32_t cdf_offset;
 147                 /* uint16_t file_comment_length; */
 148                 /* .ZIP file comment (variable size) */
 149         } formatted PACKED;
 150 } cde_header_t;
 151
 152 struct BUG_cde_header_must_be_16_bytes {
 153         char BUG_cde_header_must_be_16_bytes[
 154                 sizeof(cde_header_t) == CDE_HEADER_LEN ? 1 : -1];
 155 };
 156
 157 #define FIX_ENDIANNESS_CDE(cde_header) do { \
 158         (cde_header).formatted.cdf_offset = SWAP_LE32((cde_header).formatted.cdf_offset); \
 159 } while (0)
 160
 161 enum { zip_fd = 3 };
 162
 163
 164 #if ENABLE_DESKTOP
 165
 166 #define PEEK_FROM_END 16384
 167
 168 /* NB: does not preserve file position! */
 169 static uint32_t find_cdf_offset(void)
 170 {
 171         cde_header_t cde_header;
 172         unsigned char *p;
 173         off_t end;
 174         unsigned char *buf = xzalloc(PEEK_FROM_END);
 175
 176         end = xlseek(zip_fd, 0, SEEK_END);
 177         end -= PEEK_FROM_END;
 178         if (end < 0)
 179                 end = 0;
 180         xlseek(zip_fd, end, SEEK_SET);
 181         full_read(zip_fd, buf, PEEK_FROM_END);
 182
 183         p = buf;
 184         while (p <= buf + PEEK_FROM_END - CDE_HEADER_LEN - 4) {
 185                 if (*p != 'P') {
 186                         p++;
 187                         continue;
 188                 }
 189                 if (*++p != 'K')
 190                         continue;
 191                 if (*++p != 5)
 192                         continue;
 193                 if (*++p != 6)
 194                         continue;
 195                 /* we found CDE! */
 196                 memcpy(cde_header.raw, p + 1, CDE_HEADER_LEN);
 197                 FIX_ENDIANNESS_CDE(cde_header);
 198                 free(buf);
 199                 return cde_header.formatted.cdf_offset;
 200         }
 201         //free(buf);
 202         bb_error_msg_and_die("can't find file table");
 203 };
 204
 205 static uint32_t read_next_cdf(uint32_t cdf_offset, cdf_header_t *cdf_ptr)
 206 {
 207         off_t org;
 208
 209         org = xlseek(zip_fd, 0, SEEK_CUR);
 210
 211         if (!cdf_offset)
 212                 cdf_offset = find_cdf_offset();
 213
 214         xlseek(zip_fd, cdf_offset + 4, SEEK_SET);
 215         xread(zip_fd, cdf_ptr->raw, CDF_HEADER_LEN);
 216         FIX_ENDIANNESS_CDF(*cdf_ptr);
 217         cdf_offset += 4 + CDF_HEADER_LEN
 218                 + cdf_ptr->formatted.file_name_length
 219                 + cdf_ptr->formatted.extra_field_length
 220                 + cdf_ptr->formatted.file_comment_length;
 221
 222         xlseek(zip_fd, org, SEEK_SET);
 223         return cdf_offset;
 224 };
 225 #endif
 226
 227 static void unzip_skip(off_t skip)
 228 {
 229         if (lseek(zip_fd, skip, SEEK_CUR) == (off_t)-1)
 230                 bb_copyfd_exact_size(zip_fd, -1, skip);
 231 }
 232
 233 static void unzip_create_leading_dirs(const char *fn)
 234 {
 235         /* Create all leading directories */
 236         char *name = xstrdup(fn);
 237         if (bb_make_directory(dirname(name), 0777, FILEUTILS_RECUR)) {
 238                 xfunc_die(); /* bb_make_directory is noisy */
 239         }
 240         free(name);
 241 }
 242
 243 static void unzip_extract(zip_header_t *zip_header, int dst_fd)
 244 {
 245         if (zip_header->formatted.method == 0) {
 246                 /* Method 0 - stored (not compressed) */
 247                 off_t size = zip_header->formatted.ucmpsize;
 248                 if (size)
 249                         bb_copyfd_exact_size(zip_fd, dst_fd, size);
 250         } else {
 251                 /* Method 8 - inflate */
 252                 transformer_aux_data_t aux;
 253                 init_transformer_aux_data(&aux);
 254                 aux.bytes_in = zip_header->formatted.cmpsize;
 255                 if (inflate_unzip(&aux, zip_fd, dst_fd) < 0)
 256                         bb_error_msg_and_die("inflate error");
 257                 /* Validate decompression - crc */
 258                 if (zip_header->formatted.crc32 != (aux.crc32 ^ 0xffffffffL)) {
 259                         bb_error_msg_and_die("crc error");
 260                 }
 261                 /* Validate decompression - size */
 262                 if (zip_header->formatted.ucmpsize != aux.bytes_out) {
 263                         /* Don't die. Who knows, maybe len calculation
 264                          * was botched somewhere. After all, crc matched! */
 265                         bb_error_msg("bad length");
 266                 }
 267         }
 268 }
 269
 270 static void my_fgets80(char *buf80)
 271 {
 272         fflush_all();
 273         if (!fgets(buf80, 80, stdin)) {
 274                 bb_perror_msg_and_die("can't read standard input");
 275         }
 276 }
 277
 278 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 279 int unzip_main(int argc, char **argv)
 280 {
 281         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 282
 283         zip_header_t zip_header;
 284         smallint quiet = 0;
 285         IF_NOT_DESKTOP(const) smallint verbose = 0;
 286         smallint listing = 0;
 287         smallint overwrite = O_PROMPT;
 288         smallint x_opt_seen;
 289 #if ENABLE_DESKTOP
 290         uint32_t cdf_offset;
 291 #endif
 292         unsigned long total_usize;
 293         unsigned long total_size;
 294         unsigned total_entries;
 295         int dst_fd = -1;
 296         char *src_fn = NULL;
 297         char *dst_fn = NULL;
 298         llist_t *zaccept = NULL;
 299         llist_t *zreject = NULL;
 300         char *base_dir = NULL;
 301         int i, opt;
 302         char key_buf[80]; /* must match size used by my_fgets80 */
 303         struct stat stat_buf;
 304
 305 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 306  *
 307  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 308  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 309  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 310  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 311  * --------  ------  ------- -----   ----   ----   ------    ----
 312  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 313  * --------          -------  ---                            -------
 314  *   204372            35278  83%                            1 file
 315  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 316  * Archive:  decompress_unlzma.i.zip
 317  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 318  * --------  ------  ------- -----   ----   ----   ------    ----
 319  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 320  * --------          -------  ---                            -------
 321  *   204372            35278  83%                            1 file
 322  * # unzip -v decompress_unlzma.i.zip
 323  * Archive:  decompress_unlzma.i.zip
 324  *   Length     Date   Time    Name
 325  *  --------    ----   ----    ----
 326  *    204372  09-06-09 14:23   decompress_unlzma.i
 327  *  --------                   -------
 328  *    204372                   1 files
 329  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 330  *    204372  09-06-09 14:23   decompress_unlzma.i
 331  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 332  *   Length     Date   Time    Name
 333  *  --------    ----   ----    ----
 334  *    204372  09-06-09 14:23   decompress_unlzma.i
 335  *  --------                   -------
 336  *    204372                   1 file
 337  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 338  * Archive:  decompress_unlzma.i.zip
 339  *   Length     Date   Time    Name
 340  *  --------    ----   ----    ----
 341  *    204372  09-06-09 14:23   decompress_unlzma.i
 342  *  --------                   -------
 343  *    204372                   1 file
 344  */
 345
 346         x_opt_seen = 0;
 347         /* '-' makes getopt return 1 for non-options */
 348         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 349                 switch (opt) {
 350                 case 'd':  /* Extract to base directory */
 351                         base_dir = optarg;
 352                         break;
 353
 354                 case 'l': /* List */
 355                         listing = 1;
 356                         break;
 357
 358                 case 'n': /* Never overwrite existing files */
 359                         overwrite = O_NEVER;
 360                         break;
 361
 362                 case 'o': /* Always overwrite existing files */
 363                         overwrite = O_ALWAYS;
 364                         break;
 365
 366                 case 'p': /* Extract files to stdout and fall through to set verbosity */
 367                         dst_fd = STDOUT_FILENO;
 368
 369                 case 'q': /* Be quiet */
 370                         quiet++;
 371                         break;
 372
 373                 case 'v': /* Verbose list */
 374                         IF_DESKTOP(verbose++;)
 375                         listing = 1;
 376                         break;
 377
 378                 case 'x':
 379                         x_opt_seen = 1;
 380                         break;
 381
 382                 case 1:
 383                         if (!src_fn) {
 384                                 /* The zip file */
 385                                 /* +5: space for ".zip" and NUL */
 386                                 src_fn = xmalloc(strlen(optarg) + 5);
 387                                 strcpy(src_fn, optarg);
 388                         } else if (!x_opt_seen) {
 389                                 /* Include files */
 390                                 llist_add_to(&zaccept, optarg);
 391                         } else {
 392                                 /* Exclude files */
 393                                 llist_add_to(&zreject, optarg);
 394                         }
 395                         break;
 396
 397                 default:
 398                         bb_show_usage();
 399                 }
 400         }
 401
 402 #ifndef __GLIBC__
 403         /*
 404          * This code is needed for non-GNU getopt
 405          * which doesn't understand "-" in option string.
 406          * The -x option won't work properly in this case:
 407          * "unzip a.zip q -x w e" will be interpreted as
 408          * "unzip a.zip q w e -x" = "unzip a.zip q w e"
 409          */
 410         argv += optind;
 411         if (argv[0]) {
 412                 /* +5: space for ".zip" and NUL */
 413                 src_fn = xmalloc(strlen(argv[0]) + 5);
 414                 strcpy(src_fn, argv[0]);
 415                 while (*++argv)
 416                         llist_add_to(&zaccept, *argv);
 417         }
 418 #endif
 419
 420         if (!src_fn) {
 421                 bb_show_usage();
 422         }
 423
 424         /* Open input file */
 425         if (LONE_DASH(src_fn)) {
 426                 xdup2(STDIN_FILENO, zip_fd);
 427                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 428                 if (overwrite == O_PROMPT)
 429                         overwrite = O_NEVER;
 430         } else {
 431                 static const char extn[][5] = { ".zip", ".ZIP" };
 432                 char *ext = src_fn + strlen(src_fn);
 433                 int src_fd;
 434
 435                 i = 0;
 436                 for (;;) {
 437                         src_fd = open(src_fn, O_RDONLY);
 438                         if (src_fd >= 0)
 439                                 break;
 440                         if (++i > 2) {
 441                                 *ext = '\0';
 442                                 bb_error_msg_and_die("can't open %s[.zip]", src_fn);
 443                         }
 444                         strcpy(ext, extn[i - 1]);
 445                 }
 446                 xmove_fd(src_fd, zip_fd);
 447         }
 448
 449         /* Change dir if necessary */
 450         if (base_dir)
 451                 xchdir(base_dir);
 452
 453         if (quiet <= 1) { /* not -qq */
 454                 if (quiet == 0)
 455                         printf("Archive:  %s\n", src_fn);
 456                 if (listing) {
 457                         puts(verbose ?
 458                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 459                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 460                                 :
 461                                 "  Length     Date   Time    Name\n"
 462                                 " --------    ----   ----    ----"
 463                                 );
 464                 }
 465         }
 466
 467 /* Example of an archive with one 0-byte long file named 'z'
 468  * created by Zip 2.31 on Unix:
 469  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 470  *       sig........ vneed flags compr mtime mdate crc32>
 471  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 472  *      >..... csize...... usize...... fnlen exlen fn ex>
 473  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 474  *      >tra_field......................................
 475  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 476  *       ........... sig........ vmade vneed flags compr
 477  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 478  *       mtime mdate crc32...... csize...... usize......
 479  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 480  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 481  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 482  *      >..... fn extra_field...........................
 483  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 484  * 0080  34 00 00 00 00 00                               |4.....|
 485  */
 486         total_usize = 0;
 487         total_size = 0;
 488         total_entries = 0;
 489 #if ENABLE_DESKTOP
 490         cdf_offset = 0;
 491 #endif
 492         while (1) {
 493                 uint32_t magic;
 494                 mode_t dir_mode = 0777;
 495 #if ENABLE_DESKTOP
 496                 mode_t file_mode = 0666;
 497 #endif
 498
 499                 /* Check magic number */
 500                 xread(zip_fd, &magic, 4);
 501                 /* Central directory? It's at the end, so exit */
 502                 if (magic == ZIP_CDF_MAGIC)
 503                         break;
 504 #if ENABLE_DESKTOP
 505                 /* Data descriptor? It was a streaming file, go on */
 506                 if (magic == ZIP_DD_MAGIC) {
 507                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 508                         unzip_skip(3 * 4);
 509                         continue;
 510                 }
 511 #endif
 512                 if (magic != ZIP_FILEHEADER_MAGIC)
 513                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 514
 515                 /* Read the file header */
 516                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 517                 FIX_ENDIANNESS_ZIP(zip_header);
 518                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 519                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 520                 }
 521 #if !ENABLE_DESKTOP
 522                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 523                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 524                 }
 525 #else
 526                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 527                         /* 0x0001 - encrypted */
 528                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 529                 }
 530
 531                 {
 532                         cdf_header_t cdf_header;
 533                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 534                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 535                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 536                                  * only from Central Directory. See unzip_doc.txt */
 537                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 538                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 539                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 540                         }
 541                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 542                                 /* this archive is created on Unix */
 543                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 544                         }
 545                 }
 546 #endif
 547
 548                 /* Read filename */
 549                 free(dst_fn);
 550                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 551                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 552
 553                 /* Skip extra header bytes */
 554                 unzip_skip(zip_header.formatted.extra_len);
 555
 556                 /* Filter zip entries */
 557                 if (find_list_entry(zreject, dst_fn)
 558                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 559                 ) { /* Skip entry */
 560                         i = 'n';
 561
 562                 } else { /* Extract entry */
 563                         if (listing) { /* List entry */
 564                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 565                                 if (!verbose) {
 566                                         //      "  Length     Date   Time    Name\n"
 567                                         //      " --------    ----   ----    ----"
 568                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 569                                                 (unsigned)zip_header.formatted.ucmpsize,
 570                                                 (dostime & 0x01e00000) >> 21,
 571                                                 (dostime & 0x001f0000) >> 16,
 572                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 573                                                 (dostime & 0x0000f800) >> 11,
 574                                                 (dostime & 0x000007e0) >> 5,
 575                                                 dst_fn);
 576                                         total_usize += zip_header.formatted.ucmpsize;
 577                                 } else {
 578                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 579                                         percents = percents * 100;
 580                                         if (zip_header.formatted.ucmpsize)
 581                                                 percents /= zip_header.formatted.ucmpsize;
 582                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 583                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 584                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 585                                                 (unsigned)zip_header.formatted.ucmpsize,
 586                                                 (unsigned)zip_header.formatted.cmpsize,
 587                                                 (unsigned)percents,
 588                                                 (dostime & 0x01e00000) >> 21,
 589                                                 (dostime & 0x001f0000) >> 16,
 590                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 591                                                 (dostime & 0x0000f800) >> 11,
 592                                                 (dostime & 0x000007e0) >> 5,
 593                                                 zip_header.formatted.crc32,
 594                                                 dst_fn);
 595                                         total_usize += zip_header.formatted.ucmpsize;
 596                                         total_size += zip_header.formatted.cmpsize;
 597                                 }
 598                                 i = 'n';
 599                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 600                                 i = -1;
 601                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 602                                 if (stat(dst_fn, &stat_buf) == -1) {
 603                                         if (errno != ENOENT) {
 604                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 605                                         }
 606                                         if (!quiet) {
 607                                                 printf("   creating: %s\n", dst_fn);
 608                                         }
 609                                         unzip_create_leading_dirs(dst_fn);
 610                                         if (bb_make_directory(dst_fn, dir_mode, FILEUTILS_IGNORE_CHMOD_ERR)) {
 611                                                 xfunc_die();
 612                                         }
 613                                 } else {
 614                                         if (!S_ISDIR(stat_buf.st_mode)) {
 615                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 616                                         }
 617                                 }
 618                                 i = 'n';
 619
 620                         } else {  /* Extract file */
 621  check_file:
 622                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 623                                         if (errno != ENOENT) {
 624                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 625                                         }
 626                                         i = 'y';
 627                                 } else { /* File already exists */
 628                                         if (overwrite == O_NEVER) {
 629                                                 i = 'n';
 630                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 631                                                 if (overwrite == O_ALWAYS) {
 632                                                         i = 'y';
 633                                                 } else {
 634                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 635                                                         my_fgets80(key_buf);
 636                                                         i = key_buf[0];
 637                                                 }
 638                                         } else { /* File is not regular file */
 639                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 640                                         }
 641                                 }
 642                         }
 643                 }
 644
 645                 switch (i) {
 646                 case 'A':
 647                         overwrite = O_ALWAYS;
 648                 case 'y': /* Open file and fall into unzip */
 649                         unzip_create_leading_dirs(dst_fn);
 650 #if ENABLE_DESKTOP
 651                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 652 #else
 653                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 654 #endif
 655                 case -1: /* Unzip */
 656                         if (!quiet) {
 657                                 printf("  inflating: %s\n", dst_fn);
 658                         }
 659                         unzip_extract(&zip_header, dst_fd);
 660                         if (dst_fd != STDOUT_FILENO) {
 661                                 /* closing STDOUT is potentially bad for future business */
 662                                 close(dst_fd);
 663                         }
 664                         break;
 665
 666                 case 'N':
 667                         overwrite = O_NEVER;
 668                 case 'n':
 669                         /* Skip entry data */
 670                         unzip_skip(zip_header.formatted.cmpsize);
 671                         break;
 672
 673                 case 'r':
 674                         /* Prompt for new name */
 675                         printf("new name: ");
 676                         my_fgets80(key_buf);
 677                         free(dst_fn);
 678                         dst_fn = xstrdup(key_buf);
 679                         chomp(dst_fn);
 680                         goto check_file;
 681
 682                 default:
 683                         printf("error: invalid response [%c]\n", (char)i);
 684                         goto check_file;
 685                 }
 686
 687                 total_entries++;
 688         }
 689
 690         if (listing && quiet <= 1) {
 691                 if (!verbose) {
 692                         //      "  Length     Date   Time    Name\n"
 693                         //      " --------    ----   ----    ----"
 694                         printf( " --------                   -------\n"
 695                                 "%9lu"   "                   %u files\n",
 696                                 total_usize, total_entries);
 697                 } else {
 698                         unsigned long percents = total_usize - total_size;
 699                         percents = percents * 100;
 700                         if (total_usize)
 701                                 percents /= total_usize;
 702                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 703                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 704                         printf( "--------          -------  ---                            -------\n"
 705                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 706                                 total_usize, total_size, (unsigned)percents,
 707                                 total_entries);
 708                 }
 709         }
 710
 711         return 0;
 712 }