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:     "\n        -l      List archive contents (with -q for short form)"
  27 //usage:     "\n        -n      Never overwrite files (default)"
  28 //usage:     "\n        -o      Overwrite"
  29 //usage:     "\n        -p      Send output to stdout"
  30 //usage:     "\n        -q      Quiet"
  31 //usage:     "\n        -x XLST Exclude these files"
  32 //usage:     "\n        -d DIR  Extract files 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 int unzip_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 271 int unzip_main(int argc, char **argv)
 272 {
 273         enum { O_PROMPT, O_NEVER, O_ALWAYS };
 274
 275         zip_header_t zip_header;
 276         smallint quiet = 0;
 277         IF_NOT_DESKTOP(const) smallint verbose = 0;
 278         smallint listing = 0;
 279         smallint overwrite = O_PROMPT;
 280 #if ENABLE_DESKTOP
 281         uint32_t cdf_offset;
 282 #endif
 283         unsigned long total_usize;
 284         unsigned long total_size;
 285         unsigned total_entries;
 286         int dst_fd = -1;
 287         char *src_fn = NULL;
 288         char *dst_fn = NULL;
 289         llist_t *zaccept = NULL;
 290         llist_t *zreject = NULL;
 291         char *base_dir = NULL;
 292         int i, opt;
 293         int opt_range = 0;
 294         char key_buf[80];
 295         struct stat stat_buf;
 296
 297 /* -q, -l and -v: UnZip 5.52 of 28 February 2005, by Info-ZIP:
 298  *
 299  * # /usr/bin/unzip -qq -v decompress_unlzma.i.zip
 300  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 301  * # /usr/bin/unzip -q -v decompress_unlzma.i.zip
 302  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 303  * --------  ------  ------- -----   ----   ----   ------    ----
 304  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 305  * --------          -------  ---                            -------
 306  *   204372            35278  83%                            1 file
 307  * # /usr/bin/unzip -v decompress_unlzma.i.zip
 308  * Archive:  decompress_unlzma.i.zip
 309  *  Length   Method    Size  Ratio   Date   Time   CRC-32    Name
 310  * --------  ------  ------- -----   ----   ----   ------    ----
 311  *   204372  Defl:N    35278  83%  09-06-09 14:23  0d056252  decompress_unlzma.i
 312  * --------          -------  ---                            -------
 313  *   204372            35278  83%                            1 file
 314  * # unzip -v decompress_unlzma.i.zip
 315  * Archive:  decompress_unlzma.i.zip
 316  *   Length     Date   Time    Name
 317  *  --------    ----   ----    ----
 318  *    204372  09-06-09 14:23   decompress_unlzma.i
 319  *  --------                   -------
 320  *    204372                   1 files
 321  * # /usr/bin/unzip -l -qq decompress_unlzma.i.zip
 322  *    204372  09-06-09 14:23   decompress_unlzma.i
 323  * # /usr/bin/unzip -l -q decompress_unlzma.i.zip
 324  *   Length     Date   Time    Name
 325  *  --------    ----   ----    ----
 326  *    204372  09-06-09 14:23   decompress_unlzma.i
 327  *  --------                   -------
 328  *    204372                   1 file
 329  * # /usr/bin/unzip -l decompress_unlzma.i.zip
 330  * Archive:  decompress_unlzma.i.zip
 331  *   Length     Date   Time    Name
 332  *  --------    ----   ----    ----
 333  *    204372  09-06-09 14:23   decompress_unlzma.i
 334  *  --------                   -------
 335  *    204372                   1 file
 336  */
 337
 338         /* '-' makes getopt return 1 for non-options */
 339         while ((opt = getopt(argc, argv, "-d:lnopqxv")) != -1) {
 340                 switch (opt_range) {
 341                 case 0: /* Options */
 342                         switch (opt) {
 343                         case 'l': /* List */
 344                                 listing = 1;
 345                                 break;
 346
 347                         case 'n': /* Never overwrite existing files */
 348                                 overwrite = O_NEVER;
 349                                 break;
 350
 351                         case 'o': /* Always overwrite existing files */
 352                                 overwrite = O_ALWAYS;
 353                                 break;
 354
 355                         case 'p': /* Extract files to stdout and fall through to set verbosity */
 356                                 dst_fd = STDOUT_FILENO;
 357
 358                         case 'q': /* Be quiet */
 359                                 quiet++;
 360                                 break;
 361
 362                         case 'v': /* Verbose list */
 363                                 IF_DESKTOP(verbose++;)
 364                                 listing = 1;
 365                                 break;
 366
 367                         case 1: /* The zip file */
 368                                 /* +5: space for ".zip" and NUL */
 369                                 src_fn = xmalloc(strlen(optarg) + 5);
 370                                 strcpy(src_fn, optarg);
 371                                 opt_range++;
 372                                 break;
 373
 374                         default:
 375                                 bb_show_usage();
 376                         }
 377                         break;
 378
 379                 case 1: /* Include files */
 380                         if (opt == 1) {
 381                                 llist_add_to(&zaccept, optarg);
 382                                 break;
 383                         }
 384                         if (opt == 'd') {
 385                                 base_dir = optarg;
 386                                 opt_range += 2;
 387                                 break;
 388                         }
 389                         if (opt == 'x') {
 390                                 opt_range++;
 391                                 break;
 392                         }
 393                         bb_show_usage();
 394
 395                 case 2 : /* Exclude files */
 396                         if (opt == 1) {
 397                                 llist_add_to(&zreject, optarg);
 398                                 break;
 399                         }
 400                         if (opt == 'd') { /* Extract to base directory */
 401                                 base_dir = optarg;
 402                                 opt_range++;
 403                                 break;
 404                         }
 405                         /* fall through */
 406
 407                 default:
 408                         bb_show_usage();
 409                 }
 410         }
 411
 412         if (src_fn == NULL) {
 413                 bb_show_usage();
 414         }
 415
 416         /* Open input file */
 417         if (LONE_DASH(src_fn)) {
 418                 xdup2(STDIN_FILENO, zip_fd);
 419                 /* Cannot use prompt mode since zip data is arriving on STDIN */
 420                 if (overwrite == O_PROMPT)
 421                         overwrite = O_NEVER;
 422         } else {
 423                 static const char extn[][5] = {"", ".zip", ".ZIP"};
 424                 int orig_src_fn_len = strlen(src_fn);
 425                 int src_fd = -1;
 426
 427                 for (i = 0; (i < 3) && (src_fd == -1); i++) {
 428                         strcpy(src_fn + orig_src_fn_len, extn[i]);
 429                         src_fd = open(src_fn, O_RDONLY);
 430                 }
 431                 if (src_fd == -1) {
 432                         src_fn[orig_src_fn_len] = '\0';
 433                         bb_error_msg_and_die("can't open %s, %s.zip, %s.ZIP", src_fn, src_fn, src_fn);
 434                 }
 435                 xmove_fd(src_fd, zip_fd);
 436         }
 437
 438         /* Change dir if necessary */
 439         if (base_dir)
 440                 xchdir(base_dir);
 441
 442         if (quiet <= 1) { /* not -qq */
 443                 if (quiet == 0)
 444                         printf("Archive:  %s\n", src_fn);
 445                 if (listing) {
 446                         puts(verbose ?
 447                                 " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 448                                 "--------  ------  ------- -----   ----   ----   ------    ----"
 449                                 :
 450                                 "  Length     Date   Time    Name\n"
 451                                 " --------    ----   ----    ----"
 452                                 );
 453                 }
 454         }
 455
 456 /* Example of an archive with one 0-byte long file named 'z'
 457  * created by Zip 2.31 on Unix:
 458  * 0000 [50 4b]03 04 0a 00 00 00 00 00 42 1a b8 3c 00 00 |PK........B..<..|
 459  *       sig........ vneed flags compr mtime mdate crc32>
 460  * 0010  00 00 00 00 00 00 00 00 00 00 01 00 15 00 7a 55 |..............zU|
 461  *      >..... csize...... usize...... fnlen exlen fn ex>
 462  * 0020  54 09 00 03 cc d3 f9 4b cc d3 f9 4b 55 78 04 00 |T......K...KUx..|
 463  *      >tra_field......................................
 464  * 0030  00 00 00 00[50 4b]01 02 17 03 0a 00 00 00 00 00 |....PK..........|
 465  *       ........... sig........ vmade vneed flags compr
 466  * 0040  42 1a b8 3c 00 00 00 00 00 00 00 00 00 00 00 00 |B..<............|
 467  *       mtime mdate crc32...... csize...... usize......
 468  * 0050  01 00 0d 00 00 00 00 00 00 00 00 00 a4 81 00 00 |................|
 469  *       fnlen exlen clen. dnum. iattr eattr...... relofs> (eattr = rw-r--r--)
 470  * 0060  00 00 7a 55 54 05 00 03 cc d3 f9 4b 55 78 00 00 |..zUT......KUx..|
 471  *      >..... fn extra_field...........................
 472  * 0070 [50 4b]05 06 00 00 00 00 01 00 01 00 3c 00 00 00 |PK..........<...|
 473  * 0080  34 00 00 00 00 00                               |4.....|
 474  */
 475         total_usize = 0;
 476         total_size = 0;
 477         total_entries = 0;
 478 #if ENABLE_DESKTOP
 479         cdf_offset = 0;
 480 #endif
 481         while (1) {
 482                 uint32_t magic;
 483                 mode_t dir_mode = 0777;
 484 #if ENABLE_DESKTOP
 485                 mode_t file_mode = 0666;
 486 #endif
 487
 488                 /* Check magic number */
 489                 xread(zip_fd, &magic, 4);
 490                 /* Central directory? It's at the end, so exit */
 491                 if (magic == ZIP_CDF_MAGIC)
 492                         break;
 493 #if ENABLE_DESKTOP
 494                 /* Data descriptor? It was a streaming file, go on */
 495                 if (magic == ZIP_DD_MAGIC) {
 496                         /* skip over duplicate crc32, cmpsize and ucmpsize */
 497                         unzip_skip(3 * 4);
 498                         continue;
 499                 }
 500 #endif
 501                 if (magic != ZIP_FILEHEADER_MAGIC)
 502                         bb_error_msg_and_die("invalid zip magic %08X", (int)magic);
 503
 504                 /* Read the file header */
 505                 xread(zip_fd, zip_header.raw, ZIP_HEADER_LEN);
 506                 FIX_ENDIANNESS_ZIP(zip_header);
 507                 if ((zip_header.formatted.method != 0) && (zip_header.formatted.method != 8)) {
 508                         bb_error_msg_and_die("unsupported method %d", zip_header.formatted.method);
 509                 }
 510 #if !ENABLE_DESKTOP
 511                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0009)) {
 512                         bb_error_msg_and_die("zip flags 1 and 8 are not supported");
 513                 }
 514 #else
 515                 if (zip_header.formatted.zip_flags & SWAP_LE16(0x0001)) {
 516                         /* 0x0001 - encrypted */
 517                         bb_error_msg_and_die("zip flag 1 (encryption) is not supported");
 518                 }
 519
 520                 {
 521                         cdf_header_t cdf_header;
 522                         cdf_offset = read_next_cdf(cdf_offset, &cdf_header);
 523                         if (zip_header.formatted.zip_flags & SWAP_LE16(0x0008)) {
 524                                 /* 0x0008 - streaming. [u]cmpsize can be reliably gotten
 525                                  * only from Central Directory. See unzip_doc.txt */
 526                                 zip_header.formatted.crc32    = cdf_header.formatted.crc32;
 527                                 zip_header.formatted.cmpsize  = cdf_header.formatted.cmpsize;
 528                                 zip_header.formatted.ucmpsize = cdf_header.formatted.ucmpsize;
 529                         }
 530                         if ((cdf_header.formatted.version_made_by >> 8) == 3) {
 531                                 /* this archive is created on Unix */
 532                                 dir_mode = file_mode = (cdf_header.formatted.external_file_attributes >> 16);
 533                         }
 534                 }
 535 #endif
 536
 537                 /* Read filename */
 538                 free(dst_fn);
 539                 dst_fn = xzalloc(zip_header.formatted.filename_len + 1);
 540                 xread(zip_fd, dst_fn, zip_header.formatted.filename_len);
 541
 542                 /* Skip extra header bytes */
 543                 unzip_skip(zip_header.formatted.extra_len);
 544
 545                 /* Filter zip entries */
 546                 if (find_list_entry(zreject, dst_fn)
 547                  || (zaccept && !find_list_entry(zaccept, dst_fn))
 548                 ) { /* Skip entry */
 549                         i = 'n';
 550
 551                 } else { /* Extract entry */
 552                         if (listing) { /* List entry */
 553                                 unsigned dostime = zip_header.formatted.modtime | (zip_header.formatted.moddate << 16);
 554                                 if (!verbose) {
 555                                         //      "  Length     Date   Time    Name\n"
 556                                         //      " --------    ----   ----    ----"
 557                                         printf(       "%9u  %02u-%02u-%02u %02u:%02u   %s\n",
 558                                                 (unsigned)zip_header.formatted.ucmpsize,
 559                                                 (dostime & 0x01e00000) >> 21,
 560                                                 (dostime & 0x001f0000) >> 16,
 561                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 562                                                 (dostime & 0x0000f800) >> 11,
 563                                                 (dostime & 0x000007e0) >> 5,
 564                                                 dst_fn);
 565                                         total_usize += zip_header.formatted.ucmpsize;
 566                                 } else {
 567                                         unsigned long percents = zip_header.formatted.ucmpsize - zip_header.formatted.cmpsize;
 568                                         percents = percents * 100;
 569                                         if (zip_header.formatted.ucmpsize)
 570                                                 percents /= zip_header.formatted.ucmpsize;
 571                                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 572                                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 573                                         printf(      "%8u  Defl:N"    "%9u%4u%%  %02u-%02u-%02u %02u:%02u  %08x  %s\n",
 574                                                 (unsigned)zip_header.formatted.ucmpsize,
 575                                                 (unsigned)zip_header.formatted.cmpsize,
 576                                                 (unsigned)percents,
 577                                                 (dostime & 0x01e00000) >> 21,
 578                                                 (dostime & 0x001f0000) >> 16,
 579                                                 (((dostime & 0xfe000000) >> 25) + 1980) % 100,
 580                                                 (dostime & 0x0000f800) >> 11,
 581                                                 (dostime & 0x000007e0) >> 5,
 582                                                 zip_header.formatted.crc32,
 583                                                 dst_fn);
 584                                         total_usize += zip_header.formatted.ucmpsize;
 585                                         total_size += zip_header.formatted.cmpsize;
 586                                 }
 587                                 i = 'n';
 588                         } else if (dst_fd == STDOUT_FILENO) { /* Extracting to STDOUT */
 589                                 i = -1;
 590                         } else if (last_char_is(dst_fn, '/')) { /* Extract directory */
 591                                 if (stat(dst_fn, &stat_buf) == -1) {
 592                                         if (errno != ENOENT) {
 593                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 594                                         }
 595                                         if (!quiet) {
 596                                                 printf("   creating: %s\n", dst_fn);
 597                                         }
 598                                         unzip_create_leading_dirs(dst_fn);
 599                                         if (bb_make_directory(dst_fn, dir_mode, 0)) {
 600                                                 xfunc_die();
 601                                         }
 602                                 } else {
 603                                         if (!S_ISDIR(stat_buf.st_mode)) {
 604                                                 bb_error_msg_and_die("'%s' exists but is not directory", dst_fn);
 605                                         }
 606                                 }
 607                                 i = 'n';
 608
 609                         } else {  /* Extract file */
 610  check_file:
 611                                 if (stat(dst_fn, &stat_buf) == -1) { /* File does not exist */
 612                                         if (errno != ENOENT) {
 613                                                 bb_perror_msg_and_die("can't stat '%s'", dst_fn);
 614                                         }
 615                                         i = 'y';
 616                                 } else { /* File already exists */
 617                                         if (overwrite == O_NEVER) {
 618                                                 i = 'n';
 619                                         } else if (S_ISREG(stat_buf.st_mode)) { /* File is regular file */
 620                                                 if (overwrite == O_ALWAYS) {
 621                                                         i = 'y';
 622                                                 } else {
 623                                                         printf("replace %s? [y]es, [n]o, [A]ll, [N]one, [r]ename: ", dst_fn);
 624                                                         fflush_all();
 625                                                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 626                                                                 bb_perror_msg_and_die("can't read input");
 627                                                         }
 628                                                         i = key_buf[0];
 629                                                 }
 630                                         } else { /* File is not regular file */
 631                                                 bb_error_msg_and_die("'%s' exists but is not regular file", dst_fn);
 632                                         }
 633                                 }
 634                         }
 635                 }
 636
 637                 switch (i) {
 638                 case 'A':
 639                         overwrite = O_ALWAYS;
 640                 case 'y': /* Open file and fall into unzip */
 641                         unzip_create_leading_dirs(dst_fn);
 642 #if ENABLE_DESKTOP
 643                         dst_fd = xopen3(dst_fn, O_WRONLY | O_CREAT | O_TRUNC, file_mode);
 644 #else
 645                         dst_fd = xopen(dst_fn, O_WRONLY | O_CREAT | O_TRUNC);
 646 #endif
 647                 case -1: /* Unzip */
 648                         if (!quiet) {
 649                                 printf("  inflating: %s\n", dst_fn);
 650                         }
 651                         unzip_extract(&zip_header, dst_fd);
 652                         if (dst_fd != STDOUT_FILENO) {
 653                                 /* closing STDOUT is potentially bad for future business */
 654                                 close(dst_fd);
 655                         }
 656                         break;
 657
 658                 case 'N':
 659                         overwrite = O_NEVER;
 660                 case 'n':
 661                         /* Skip entry data */
 662                         unzip_skip(zip_header.formatted.cmpsize);
 663                         break;
 664
 665                 case 'r':
 666                         /* Prompt for new name */
 667                         printf("new name: ");
 668                         if (!fgets(key_buf, sizeof(key_buf), stdin)) {
 669                                 bb_perror_msg_and_die("can't read input");
 670                         }
 671                         free(dst_fn);
 672                         dst_fn = xstrdup(key_buf);
 673                         chomp(dst_fn);
 674                         goto check_file;
 675
 676                 default:
 677                         printf("error: invalid response [%c]\n", (char)i);
 678                         goto check_file;
 679                 }
 680
 681                 total_entries++;
 682         }
 683
 684         if (listing && quiet <= 1) {
 685                 if (!verbose) {
 686                         //      "  Length     Date   Time    Name\n"
 687                         //      " --------    ----   ----    ----"
 688                         printf( " --------                   -------\n"
 689                                 "%9lu"   "                   %u files\n",
 690                                 total_usize, total_entries);
 691                 } else {
 692                         unsigned long percents = total_usize - total_size;
 693                         percents = percents * 100;
 694                         if (total_usize)
 695                                 percents /= total_usize;
 696                         //      " Length   Method    Size  Ratio   Date   Time   CRC-32    Name\n"
 697                         //      "--------  ------  ------- -----   ----   ----   ------    ----"
 698                         printf( "--------          -------  ---                            -------\n"
 699                                 "%8lu"              "%17lu%4u%%                            %u files\n",
 700                                 total_usize, total_size, (unsigned)percents,
 701                                 total_entries);
 702                 }
 703         }
 704
 705         return 0;
 706 }