archive-zip.c

   1 /*
   2  * Copyright (c) 2006 Rene Scharfe
   3  */
   4 #include "cache.h"
   5 #include "config.h"
   6 #include "archive.h"
   7 #include "hex.h"
   8 #include "streaming.h"
   9 #include "utf8.h"
  10 #include "object-store.h"
  11 #include "userdiff.h"
  12 #include "xdiff-interface.h"
  13 #include "date.h"
  14
  15 static int zip_date;
  16 static int zip_time;
  17
  18 /* We only care about the "buf" part here. */
  19 static struct strbuf zip_dir;
  20
  21 static uintmax_t zip_offset;
  22 static uint64_t zip_dir_entries;
  23
  24 static unsigned int max_creator_version;
  25
  26 #define ZIP_STREAM      (1 <<  3)
  27 #define ZIP_UTF8        (1 << 11)
  28
  29 enum zip_method {
  30         ZIP_METHOD_STORE = 0,
  31         ZIP_METHOD_DEFLATE = 8
  32 };
  33
  34 struct zip_local_header {
  35         unsigned char magic[4];
  36         unsigned char version[2];
  37         unsigned char flags[2];
  38         unsigned char compression_method[2];
  39         unsigned char mtime[2];
  40         unsigned char mdate[2];
  41         unsigned char crc32[4];
  42         unsigned char compressed_size[4];
  43         unsigned char size[4];
  44         unsigned char filename_length[2];
  45         unsigned char extra_length[2];
  46         unsigned char _end[1];
  47 };
  48
  49 struct zip_data_desc {
  50         unsigned char magic[4];
  51         unsigned char crc32[4];
  52         unsigned char compressed_size[4];
  53         unsigned char size[4];
  54         unsigned char _end[1];
  55 };
  56
  57 struct zip64_data_desc {
  58         unsigned char magic[4];
  59         unsigned char crc32[4];
  60         unsigned char compressed_size[8];
  61         unsigned char size[8];
  62         unsigned char _end[1];
  63 };
  64
  65 struct zip_dir_trailer {
  66         unsigned char magic[4];
  67         unsigned char disk[2];
  68         unsigned char directory_start_disk[2];
  69         unsigned char entries_on_this_disk[2];
  70         unsigned char entries[2];
  71         unsigned char size[4];
  72         unsigned char offset[4];
  73         unsigned char comment_length[2];
  74         unsigned char _end[1];
  75 };
  76
  77 struct zip_extra_mtime {
  78         unsigned char magic[2];
  79         unsigned char extra_size[2];
  80         unsigned char flags[1];
  81         unsigned char mtime[4];
  82         unsigned char _end[1];
  83 };
  84
  85 struct zip64_extra {
  86         unsigned char magic[2];
  87         unsigned char extra_size[2];
  88         unsigned char size[8];
  89         unsigned char compressed_size[8];
  90         unsigned char _end[1];
  91 };
  92
  93 struct zip64_dir_trailer {
  94         unsigned char magic[4];
  95         unsigned char record_size[8];
  96         unsigned char creator_version[2];
  97         unsigned char version[2];
  98         unsigned char disk[4];
  99         unsigned char directory_start_disk[4];
 100         unsigned char entries_on_this_disk[8];
 101         unsigned char entries[8];
 102         unsigned char size[8];
 103         unsigned char offset[8];
 104         unsigned char _end[1];
 105 };
 106
 107 struct zip64_dir_trailer_locator {
 108         unsigned char magic[4];
 109         unsigned char disk[4];
 110         unsigned char offset[8];
 111         unsigned char number_of_disks[4];
 112         unsigned char _end[1];
 113 };
 114
 115 /*
 116  * On ARM, padding is added at the end of the struct, so a simple
 117  * sizeof(struct ...) reports two bytes more than the payload size
 118  * we're interested in.
 119  */
 120 #define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 121 #define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 122 #define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 123 #define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 124 #define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 125 #define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 126 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 127         (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 128 #define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 129 #define ZIP64_EXTRA_PAYLOAD_SIZE \
 130         (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 131 #define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 132 #define ZIP64_DIR_TRAILER_RECORD_SIZE \
 133         (ZIP64_DIR_TRAILER_SIZE - \
 134          offsetof(struct zip64_dir_trailer, creator_version))
 135 #define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 136         offsetof(struct zip64_dir_trailer_locator, _end)
 137
 138 static void copy_le16(unsigned char *dest, unsigned int n)
 139 {
 140         dest[0] = 0xff & n;
 141         dest[1] = 0xff & (n >> 010);
 142 }
 143
 144 static void copy_le32(unsigned char *dest, unsigned int n)
 145 {
 146         dest[0] = 0xff & n;
 147         dest[1] = 0xff & (n >> 010);
 148         dest[2] = 0xff & (n >> 020);
 149         dest[3] = 0xff & (n >> 030);
 150 }
 151
 152 static void copy_le64(unsigned char *dest, uint64_t n)
 153 {
 154         dest[0] = 0xff & n;
 155         dest[1] = 0xff & (n >> 010);
 156         dest[2] = 0xff & (n >> 020);
 157         dest[3] = 0xff & (n >> 030);
 158         dest[4] = 0xff & (n >> 040);
 159         dest[5] = 0xff & (n >> 050);
 160         dest[6] = 0xff & (n >> 060);
 161         dest[7] = 0xff & (n >> 070);
 162 }
 163
 164 static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 165 {
 166         if (n <= max)
 167                 return n;
 168         *clamped = 1;
 169         return max;
 170 }
 171
 172 static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 173 {
 174         copy_le16(dest, clamp_max(n, 0xffff, clamped));
 175 }
 176
 177 static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 178 {
 179         copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 180 }
 181
 182 static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 183 {
 184         while (size-- > 0) {
 185                 strbuf_addch(sb, n & 0xff);
 186                 n >>= 8;
 187         }
 188         return -!!n;
 189 }
 190
 191 static uint32_t clamp32(uintmax_t n)
 192 {
 193         const uintmax_t max = 0xffffffff;
 194         return (n < max) ? n : max;
 195 }
 196
 197 static void *zlib_deflate_raw(void *data, unsigned long size,
 198                               int compression_level,
 199                               unsigned long *compressed_size)
 200 {
 201         git_zstream stream;
 202         unsigned long maxsize;
 203         void *buffer;
 204         int result;
 205
 206         git_deflate_init_raw(&stream, compression_level);
 207         maxsize = git_deflate_bound(&stream, size);
 208         buffer = xmalloc(maxsize);
 209
 210         stream.next_in = data;
 211         stream.avail_in = size;
 212         stream.next_out = buffer;
 213         stream.avail_out = maxsize;
 214
 215         do {
 216                 result = git_deflate(&stream, Z_FINISH);
 217         } while (result == Z_OK);
 218
 219         if (result != Z_STREAM_END) {
 220                 free(buffer);
 221                 return NULL;
 222         }
 223
 224         git_deflate_end(&stream);
 225         *compressed_size = stream.total_out;
 226
 227         return buffer;
 228 }
 229
 230 static void write_zip_data_desc(unsigned long size,
 231                                 unsigned long compressed_size,
 232                                 unsigned long crc)
 233 {
 234         if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 235                 struct zip64_data_desc trailer;
 236                 copy_le32(trailer.magic, 0x08074b50);
 237                 copy_le32(trailer.crc32, crc);
 238                 copy_le64(trailer.compressed_size, compressed_size);
 239                 copy_le64(trailer.size, size);
 240                 write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 241                 zip_offset += ZIP64_DATA_DESC_SIZE;
 242         } else {
 243                 struct zip_data_desc trailer;
 244                 copy_le32(trailer.magic, 0x08074b50);
 245                 copy_le32(trailer.crc32, crc);
 246                 copy_le32(trailer.compressed_size, compressed_size);
 247                 copy_le32(trailer.size, size);
 248                 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 249                 zip_offset += ZIP_DATA_DESC_SIZE;
 250         }
 251 }
 252
 253 static void set_zip_header_data_desc(struct zip_local_header *header,
 254                                      unsigned long size,
 255                                      unsigned long compressed_size,
 256                                      unsigned long crc)
 257 {
 258         copy_le32(header->crc32, crc);
 259         copy_le32(header->compressed_size, compressed_size);
 260         copy_le32(header->size, size);
 261 }
 262
 263 static int has_only_ascii(const char *s)
 264 {
 265         for (;;) {
 266                 int c = *s++;
 267                 if (c == '\0')
 268                         return 1;
 269                 if (!isascii(c))
 270                         return 0;
 271         }
 272 }
 273
 274 static int entry_is_binary(struct index_state *istate, const char *path,
 275                            const void *buffer, size_t size)
 276 {
 277         struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
 278         if (!driver)
 279                 driver = userdiff_find_by_name("default");
 280         if (driver->binary != -1)
 281                 return driver->binary;
 282         return buffer_is_binary(buffer, size);
 283 }
 284
 285 #define STREAM_BUFFER_SIZE (1024 * 16)
 286
 287 static int write_zip_entry(struct archiver_args *args,
 288                            const struct object_id *oid,
 289                            const char *path, size_t pathlen,
 290                            unsigned int mode,
 291                            void *buffer, unsigned long size)
 292 {
 293         struct zip_local_header header;
 294         uintmax_t offset = zip_offset;
 295         struct zip_extra_mtime extra;
 296         struct zip64_extra extra64;
 297         size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 298         int need_zip64_extra = 0;
 299         unsigned long attr2;
 300         unsigned long compressed_size;
 301         unsigned long crc;
 302         enum zip_method method;
 303         unsigned char *out;
 304         void *deflated = NULL;
 305         struct git_istream *stream = NULL;
 306         unsigned long flags = 0;
 307         int is_binary = -1;
 308         const char *path_without_prefix = path + args->baselen;
 309         unsigned int creator_version = 0;
 310         unsigned int version_needed = 10;
 311         size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 312         size_t zip64_dir_extra_payload_size = 0;
 313
 314         crc = crc32(0, NULL, 0);
 315
 316         if (!has_only_ascii(path)) {
 317                 if (is_utf8(path))
 318                         flags |= ZIP_UTF8;
 319                 else
 320                         warning(_("path is not valid UTF-8: %s"), path);
 321         }
 322
 323         if (pathlen > 0xffff) {
 324                 return error(_("path too long (%d chars, SHA1: %s): %s"),
 325                                 (int)pathlen, oid_to_hex(oid), path);
 326         }
 327
 328         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 329                 method = ZIP_METHOD_STORE;
 330                 attr2 = 16;
 331                 out = NULL;
 332                 compressed_size = 0;
 333         } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 334                 method = ZIP_METHOD_STORE;
 335                 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 336                         (mode & 0111) ? ((mode) << 16) : 0;
 337                 if (S_ISLNK(mode) || (mode & 0111))
 338                         creator_version = 0x0317;
 339                 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 340                         method = ZIP_METHOD_DEFLATE;
 341
 342                 if (!buffer) {
 343                         enum object_type type;
 344                         stream = open_istream(args->repo, oid, &type, &size,
 345                                               NULL);
 346                         if (!stream)
 347                                 return error(_("cannot stream blob %s"),
 348                                              oid_to_hex(oid));
 349                         flags |= ZIP_STREAM;
 350                         out = NULL;
 351                 } else {
 352                         crc = crc32(crc, buffer, size);
 353                         is_binary = entry_is_binary(args->repo->index,
 354                                                     path_without_prefix,
 355                                                     buffer, size);
 356                         out = buffer;
 357                 }
 358                 compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
 359         } else {
 360                 return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
 361                                 oid_to_hex(oid));
 362         }
 363
 364         if (creator_version > max_creator_version)
 365                 max_creator_version = creator_version;
 366
 367         if (buffer && method == ZIP_METHOD_DEFLATE) {
 368                 out = deflated = zlib_deflate_raw(buffer, size,
 369                                                   args->compression_level,
 370                                                   &compressed_size);
 371                 if (!out || compressed_size >= size) {
 372                         out = buffer;
 373                         method = ZIP_METHOD_STORE;
 374                         compressed_size = size;
 375                 }
 376         }
 377
 378         copy_le16(extra.magic, 0x5455);
 379         copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 380         extra.flags[0] = 1;     /* just mtime */
 381         copy_le32(extra.mtime, args->time);
 382
 383         if (size > 0xffffffff || compressed_size > 0xffffffff)
 384                 need_zip64_extra = 1;
 385         if (stream && size > 0x7fffffff)
 386                 need_zip64_extra = 1;
 387
 388         if (need_zip64_extra)
 389                 version_needed = 45;
 390
 391         copy_le32(header.magic, 0x04034b50);
 392         copy_le16(header.version, version_needed);
 393         copy_le16(header.flags, flags);
 394         copy_le16(header.compression_method, method);
 395         copy_le16(header.mtime, zip_time);
 396         copy_le16(header.mdate, zip_date);
 397         if (need_zip64_extra) {
 398                 set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 399                 header_extra_size += ZIP64_EXTRA_SIZE;
 400         } else {
 401                 set_zip_header_data_desc(&header, size, compressed_size, crc);
 402         }
 403         copy_le16(header.filename_length, pathlen);
 404         copy_le16(header.extra_length, header_extra_size);
 405         write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 406         zip_offset += ZIP_LOCAL_HEADER_SIZE;
 407         write_or_die(1, path, pathlen);
 408         zip_offset += pathlen;
 409         write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 410         zip_offset += ZIP_EXTRA_MTIME_SIZE;
 411         if (need_zip64_extra) {
 412                 copy_le16(extra64.magic, 0x0001);
 413                 copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 414                 copy_le64(extra64.size, size);
 415                 copy_le64(extra64.compressed_size, compressed_size);
 416                 write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 417                 zip_offset += ZIP64_EXTRA_SIZE;
 418         }
 419
 420         if (stream && method == ZIP_METHOD_STORE) {
 421                 unsigned char buf[STREAM_BUFFER_SIZE];
 422                 ssize_t readlen;
 423
 424                 for (;;) {
 425                         readlen = read_istream(stream, buf, sizeof(buf));
 426                         if (readlen <= 0)
 427                                 break;
 428                         crc = crc32(crc, buf, readlen);
 429                         if (is_binary == -1)
 430                                 is_binary = entry_is_binary(args->repo->index,
 431                                                             path_without_prefix,
 432                                                             buf, readlen);
 433                         write_or_die(1, buf, readlen);
 434                 }
 435                 close_istream(stream);
 436                 if (readlen)
 437                         return readlen;
 438
 439                 compressed_size = size;
 440                 zip_offset += compressed_size;
 441
 442                 write_zip_data_desc(size, compressed_size, crc);
 443         } else if (stream && method == ZIP_METHOD_DEFLATE) {
 444                 unsigned char buf[STREAM_BUFFER_SIZE];
 445                 ssize_t readlen;
 446                 git_zstream zstream;
 447                 int result;
 448                 size_t out_len;
 449                 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 450
 451                 git_deflate_init_raw(&zstream, args->compression_level);
 452
 453                 compressed_size = 0;
 454                 zstream.next_out = compressed;
 455                 zstream.avail_out = sizeof(compressed);
 456
 457                 for (;;) {
 458                         readlen = read_istream(stream, buf, sizeof(buf));
 459                         if (readlen <= 0)
 460                                 break;
 461                         crc = crc32(crc, buf, readlen);
 462                         if (is_binary == -1)
 463                                 is_binary = entry_is_binary(args->repo->index,
 464                                                             path_without_prefix,
 465                                                             buf, readlen);
 466
 467                         zstream.next_in = buf;
 468                         zstream.avail_in = readlen;
 469                         result = git_deflate(&zstream, 0);
 470                         if (result != Z_OK)
 471                                 die(_("deflate error (%d)"), result);
 472                         out_len = zstream.next_out - compressed;
 473
 474                         if (out_len > 0) {
 475                                 write_or_die(1, compressed, out_len);
 476                                 compressed_size += out_len;
 477                                 zstream.next_out = compressed;
 478                                 zstream.avail_out = sizeof(compressed);
 479                         }
 480
 481                 }
 482                 close_istream(stream);
 483                 if (readlen)
 484                         return readlen;
 485
 486                 zstream.next_in = buf;
 487                 zstream.avail_in = 0;
 488                 result = git_deflate(&zstream, Z_FINISH);
 489                 if (result != Z_STREAM_END)
 490                         die("deflate error (%d)", result);
 491
 492                 git_deflate_end(&zstream);
 493                 out_len = zstream.next_out - compressed;
 494                 write_or_die(1, compressed, out_len);
 495                 compressed_size += out_len;
 496                 zip_offset += compressed_size;
 497
 498                 write_zip_data_desc(size, compressed_size, crc);
 499         } else if (compressed_size > 0) {
 500                 write_or_die(1, out, compressed_size);
 501                 zip_offset += compressed_size;
 502         }
 503
 504         free(deflated);
 505
 506         if (compressed_size > 0xffffffff || size > 0xffffffff ||
 507             offset > 0xffffffff) {
 508                 if (compressed_size >= 0xffffffff)
 509                         zip64_dir_extra_payload_size += 8;
 510                 if (size >= 0xffffffff)
 511                         zip64_dir_extra_payload_size += 8;
 512                 if (offset >= 0xffffffff)
 513                         zip64_dir_extra_payload_size += 8;
 514                 zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 515         }
 516
 517         strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 518         strbuf_add_le(&zip_dir, 2, creator_version);
 519         strbuf_add_le(&zip_dir, 2, version_needed);
 520         strbuf_add_le(&zip_dir, 2, flags);
 521         strbuf_add_le(&zip_dir, 2, method);
 522         strbuf_add_le(&zip_dir, 2, zip_time);
 523         strbuf_add_le(&zip_dir, 2, zip_date);
 524         strbuf_add_le(&zip_dir, 4, crc);
 525         strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 526         strbuf_add_le(&zip_dir, 4, clamp32(size));
 527         strbuf_add_le(&zip_dir, 2, pathlen);
 528         strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 529         strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 530         strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 531         strbuf_add_le(&zip_dir, 2, !is_binary);
 532         strbuf_add_le(&zip_dir, 4, attr2);
 533         strbuf_add_le(&zip_dir, 4, clamp32(offset));
 534         strbuf_add(&zip_dir, path, pathlen);
 535         strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 536         if (zip64_dir_extra_payload_size) {
 537                 strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 538                 strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 539                 if (size >= 0xffffffff)
 540                         strbuf_add_le(&zip_dir, 8, size);
 541                 if (compressed_size >= 0xffffffff)
 542                         strbuf_add_le(&zip_dir, 8, compressed_size);
 543                 if (offset >= 0xffffffff)
 544                         strbuf_add_le(&zip_dir, 8, offset);
 545         }
 546         zip_dir_entries++;
 547
 548         return 0;
 549 }
 550
 551 static void write_zip64_trailer(void)
 552 {
 553         struct zip64_dir_trailer trailer64;
 554         struct zip64_dir_trailer_locator locator64;
 555
 556         copy_le32(trailer64.magic, 0x06064b50);
 557         copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 558         copy_le16(trailer64.creator_version, max_creator_version);
 559         copy_le16(trailer64.version, 45);
 560         copy_le32(trailer64.disk, 0);
 561         copy_le32(trailer64.directory_start_disk, 0);
 562         copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 563         copy_le64(trailer64.entries, zip_dir_entries);
 564         copy_le64(trailer64.size, zip_dir.len);
 565         copy_le64(trailer64.offset, zip_offset);
 566
 567         copy_le32(locator64.magic, 0x07064b50);
 568         copy_le32(locator64.disk, 0);
 569         copy_le64(locator64.offset, zip_offset + zip_dir.len);
 570         copy_le32(locator64.number_of_disks, 1);
 571
 572         write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 573         write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 574 }
 575
 576 static void write_zip_trailer(const struct object_id *oid)
 577 {
 578         struct zip_dir_trailer trailer;
 579         int clamped = 0;
 580
 581         copy_le32(trailer.magic, 0x06054b50);
 582         copy_le16(trailer.disk, 0);
 583         copy_le16(trailer.directory_start_disk, 0);
 584         copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 585                         &clamped);
 586         copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 587         copy_le32(trailer.size, zip_dir.len);
 588         copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 589         copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
 590
 591         write_or_die(1, zip_dir.buf, zip_dir.len);
 592         if (clamped)
 593                 write_zip64_trailer();
 594         write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 595         if (oid)
 596                 write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
 597 }
 598
 599 static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 600 {
 601         time_t time;
 602         struct tm tm;
 603
 604         if (date_overflows(*timestamp))
 605                 die(_("timestamp too large for this system: %"PRItime),
 606                     *timestamp);
 607         time = (time_t)*timestamp;
 608         localtime_r(&time, &tm);
 609         *timestamp = time;
 610
 611         *dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +
 612                     (tm.tm_year + 1900 - 1980) * 512;
 613         *dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;
 614 }
 615
 616 static int archive_zip_config(const char *var, const char *value,
 617                               void *data UNUSED)
 618 {
 619         return userdiff_config(var, value);
 620 }
 621
 622 static int write_zip_archive(const struct archiver *ar UNUSED,
 623                              struct archiver_args *args)
 624 {
 625         int err;
 626
 627         git_config(archive_zip_config, NULL);
 628
 629         dos_time(&args->time, &zip_date, &zip_time);
 630
 631         strbuf_init(&zip_dir, 0);
 632
 633         err = write_archive_entries(args, write_zip_entry);
 634         if (!err)
 635                 write_zip_trailer(args->commit_oid);
 636
 637         strbuf_release(&zip_dir);
 638
 639         return err;
 640 }
 641
 642 static struct archiver zip_archiver = {
 643         .name = "zip",
 644         .write_archive = write_zip_archive,
 645         .flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
 646 };
 647
 648 void init_zip_archiver(void)
 649 {
 650         register_archiver(&zip_archiver);
 651 }