archive-zip.c

   1 /*
   2  * Copyright (c) 2006 Rene Scharfe
   3  */
   4 #include "git-compat-util.h"
   5 #include "config.h"
   6 #include "archive.h"
   7 #include "gettext.h"
   8 #include "git-zlib.h"
   9 #include "hex.h"
  10 #include "streaming.h"
  11 #include "utf8.h"
  12 #include "object-store-ll.h"
  13 #include "strbuf.h"
  14 #include "userdiff.h"
  15 #include "write-or-die.h"
  16 #include "xdiff-interface.h"
  17 #include "date.h"
  18
  19 static int zip_date;
  20 static int zip_time;
  21
  22 /* We only care about the "buf" part here. */
  23 static struct strbuf zip_dir;
  24
  25 static uintmax_t zip_offset;
  26 static uint64_t zip_dir_entries;
  27
  28 static unsigned int max_creator_version;
  29
  30 #define ZIP_STREAM      (1 <<  3)
  31 #define ZIP_UTF8        (1 << 11)
  32
  33 enum zip_method {
  34         ZIP_METHOD_STORE = 0,
  35         ZIP_METHOD_DEFLATE = 8
  36 };
  37
  38 struct zip_local_header {
  39         unsigned char magic[4];
  40         unsigned char version[2];
  41         unsigned char flags[2];
  42         unsigned char compression_method[2];
  43         unsigned char mtime[2];
  44         unsigned char mdate[2];
  45         unsigned char crc32[4];
  46         unsigned char compressed_size[4];
  47         unsigned char size[4];
  48         unsigned char filename_length[2];
  49         unsigned char extra_length[2];
  50         unsigned char _end[1];
  51 };
  52
  53 struct zip_data_desc {
  54         unsigned char magic[4];
  55         unsigned char crc32[4];
  56         unsigned char compressed_size[4];
  57         unsigned char size[4];
  58         unsigned char _end[1];
  59 };
  60
  61 struct zip64_data_desc {
  62         unsigned char magic[4];
  63         unsigned char crc32[4];
  64         unsigned char compressed_size[8];
  65         unsigned char size[8];
  66         unsigned char _end[1];
  67 };
  68
  69 struct zip_dir_trailer {
  70         unsigned char magic[4];
  71         unsigned char disk[2];
  72         unsigned char directory_start_disk[2];
  73         unsigned char entries_on_this_disk[2];
  74         unsigned char entries[2];
  75         unsigned char size[4];
  76         unsigned char offset[4];
  77         unsigned char comment_length[2];
  78         unsigned char _end[1];
  79 };
  80
  81 struct zip_extra_mtime {
  82         unsigned char magic[2];
  83         unsigned char extra_size[2];
  84         unsigned char flags[1];
  85         unsigned char mtime[4];
  86         unsigned char _end[1];
  87 };
  88
  89 struct zip64_extra {
  90         unsigned char magic[2];
  91         unsigned char extra_size[2];
  92         unsigned char size[8];
  93         unsigned char compressed_size[8];
  94         unsigned char _end[1];
  95 };
  96
  97 struct zip64_dir_trailer {
  98         unsigned char magic[4];
  99         unsigned char record_size[8];
 100         unsigned char creator_version[2];
 101         unsigned char version[2];
 102         unsigned char disk[4];
 103         unsigned char directory_start_disk[4];
 104         unsigned char entries_on_this_disk[8];
 105         unsigned char entries[8];
 106         unsigned char size[8];
 107         unsigned char offset[8];
 108         unsigned char _end[1];
 109 };
 110
 111 struct zip64_dir_trailer_locator {
 112         unsigned char magic[4];
 113         unsigned char disk[4];
 114         unsigned char offset[8];
 115         unsigned char number_of_disks[4];
 116         unsigned char _end[1];
 117 };
 118
 119 /*
 120  * On ARM, padding is added at the end of the struct, so a simple
 121  * sizeof(struct ...) reports two bytes more than the payload size
 122  * we're interested in.
 123  */
 124 #define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 125 #define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 126 #define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 127 #define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 128 #define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 129 #define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 130 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 131         (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 132 #define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 133 #define ZIP64_EXTRA_PAYLOAD_SIZE \
 134         (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 135 #define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 136 #define ZIP64_DIR_TRAILER_RECORD_SIZE \
 137         (ZIP64_DIR_TRAILER_SIZE - \
 138          offsetof(struct zip64_dir_trailer, creator_version))
 139 #define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 140         offsetof(struct zip64_dir_trailer_locator, _end)
 141
 142 static void copy_le16(unsigned char *dest, unsigned int n)
 143 {
 144         dest[0] = 0xff & n;
 145         dest[1] = 0xff & (n >> 010);
 146 }
 147
 148 static void copy_le32(unsigned char *dest, unsigned int n)
 149 {
 150         dest[0] = 0xff & n;
 151         dest[1] = 0xff & (n >> 010);
 152         dest[2] = 0xff & (n >> 020);
 153         dest[3] = 0xff & (n >> 030);
 154 }
 155
 156 static void copy_le64(unsigned char *dest, uint64_t n)
 157 {
 158         dest[0] = 0xff & n;
 159         dest[1] = 0xff & (n >> 010);
 160         dest[2] = 0xff & (n >> 020);
 161         dest[3] = 0xff & (n >> 030);
 162         dest[4] = 0xff & (n >> 040);
 163         dest[5] = 0xff & (n >> 050);
 164         dest[6] = 0xff & (n >> 060);
 165         dest[7] = 0xff & (n >> 070);
 166 }
 167
 168 static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 169 {
 170         if (n <= max)
 171                 return n;
 172         *clamped = 1;
 173         return max;
 174 }
 175
 176 static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 177 {
 178         copy_le16(dest, clamp_max(n, 0xffff, clamped));
 179 }
 180
 181 static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 182 {
 183         copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 184 }
 185
 186 static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 187 {
 188         while (size-- > 0) {
 189                 strbuf_addch(sb, n & 0xff);
 190                 n >>= 8;
 191         }
 192         return -!!n;
 193 }
 194
 195 static uint32_t clamp32(uintmax_t n)
 196 {
 197         const uintmax_t max = 0xffffffff;
 198         return (n < max) ? n : max;
 199 }
 200
 201 static void *zlib_deflate_raw(void *data, unsigned long size,
 202                               int compression_level,
 203                               unsigned long *compressed_size)
 204 {
 205         git_zstream stream;
 206         unsigned long maxsize;
 207         void *buffer;
 208         int result;
 209
 210         git_deflate_init_raw(&stream, compression_level);
 211         maxsize = git_deflate_bound(&stream, size);
 212         buffer = xmalloc(maxsize);
 213
 214         stream.next_in = data;
 215         stream.avail_in = size;
 216         stream.next_out = buffer;
 217         stream.avail_out = maxsize;
 218
 219         do {
 220                 result = git_deflate(&stream, Z_FINISH);
 221         } while (result == Z_OK);
 222
 223         if (result != Z_STREAM_END) {
 224                 free(buffer);
 225                 return NULL;
 226         }
 227
 228         git_deflate_end(&stream);
 229         *compressed_size = stream.total_out;
 230
 231         return buffer;
 232 }
 233
 234 static void write_zip_data_desc(unsigned long size,
 235                                 unsigned long compressed_size,
 236                                 unsigned long crc)
 237 {
 238         if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 239                 struct zip64_data_desc trailer;
 240                 copy_le32(trailer.magic, 0x08074b50);
 241                 copy_le32(trailer.crc32, crc);
 242                 copy_le64(trailer.compressed_size, compressed_size);
 243                 copy_le64(trailer.size, size);
 244                 write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 245                 zip_offset += ZIP64_DATA_DESC_SIZE;
 246         } else {
 247                 struct zip_data_desc trailer;
 248                 copy_le32(trailer.magic, 0x08074b50);
 249                 copy_le32(trailer.crc32, crc);
 250                 copy_le32(trailer.compressed_size, compressed_size);
 251                 copy_le32(trailer.size, size);
 252                 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 253                 zip_offset += ZIP_DATA_DESC_SIZE;
 254         }
 255 }
 256
 257 static void set_zip_header_data_desc(struct zip_local_header *header,
 258                                      unsigned long size,
 259                                      unsigned long compressed_size,
 260                                      unsigned long crc)
 261 {
 262         copy_le32(header->crc32, crc);
 263         copy_le32(header->compressed_size, compressed_size);
 264         copy_le32(header->size, size);
 265 }
 266
 267 static int has_only_ascii(const char *s)
 268 {
 269         for (;;) {
 270                 int c = *s++;
 271                 if (c == '\0')
 272                         return 1;
 273                 if (!isascii(c))
 274                         return 0;
 275         }
 276 }
 277
 278 static int entry_is_binary(struct index_state *istate, const char *path,
 279                            const void *buffer, size_t size)
 280 {
 281         struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
 282         if (!driver)
 283                 driver = userdiff_find_by_name("default");
 284         if (driver->binary != -1)
 285                 return driver->binary;
 286         return buffer_is_binary(buffer, size);
 287 }
 288
 289 #define STREAM_BUFFER_SIZE (1024 * 16)
 290
 291 static int write_zip_entry(struct archiver_args *args,
 292                            const struct object_id *oid,
 293                            const char *path, size_t pathlen,
 294                            unsigned int mode,
 295                            void *buffer, unsigned long size)
 296 {
 297         struct zip_local_header header;
 298         uintmax_t offset = zip_offset;
 299         struct zip_extra_mtime extra;
 300         struct zip64_extra extra64;
 301         size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 302         int need_zip64_extra = 0;
 303         unsigned long attr2;
 304         unsigned long compressed_size;
 305         unsigned long crc;
 306         enum zip_method method;
 307         unsigned char *out;
 308         void *deflated = NULL;
 309         struct git_istream *stream = NULL;
 310         unsigned long flags = 0;
 311         int is_binary = -1;
 312         const char *path_without_prefix = path + args->baselen;
 313         unsigned int creator_version = 0;
 314         unsigned int version_needed = 10;
 315         size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 316         size_t zip64_dir_extra_payload_size = 0;
 317
 318         crc = crc32(0, NULL, 0);
 319
 320         if (!has_only_ascii(path)) {
 321                 if (is_utf8(path))
 322                         flags |= ZIP_UTF8;
 323                 else
 324                         warning(_("path is not valid UTF-8: %s"), path);
 325         }
 326
 327         if (pathlen > 0xffff) {
 328                 return error(_("path too long (%d chars, SHA1: %s): %s"),
 329                                 (int)pathlen, oid_to_hex(oid), path);
 330         }
 331
 332         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 333                 method = ZIP_METHOD_STORE;
 334                 attr2 = 16;
 335                 out = NULL;
 336                 compressed_size = 0;
 337         } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 338                 method = ZIP_METHOD_STORE;
 339                 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 340                         (mode & 0111) ? ((mode) << 16) : 0;
 341                 if (S_ISLNK(mode) || (mode & 0111))
 342                         creator_version = 0x0317;
 343                 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 344                         method = ZIP_METHOD_DEFLATE;
 345
 346                 if (!buffer) {
 347                         enum object_type type;
 348                         stream = open_istream(args->repo, oid, &type, &size,
 349                                               NULL);
 350                         if (!stream)
 351                                 return error(_("cannot stream blob %s"),
 352                                              oid_to_hex(oid));
 353                         flags |= ZIP_STREAM;
 354                         out = NULL;
 355                 } else {
 356                         crc = crc32(crc, buffer, size);
 357                         is_binary = entry_is_binary(args->repo->index,
 358                                                     path_without_prefix,
 359                                                     buffer, size);
 360                         out = buffer;
 361                 }
 362                 compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
 363         } else {
 364                 return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
 365                                 oid_to_hex(oid));
 366         }
 367
 368         if (creator_version > max_creator_version)
 369                 max_creator_version = creator_version;
 370
 371         if (buffer && method == ZIP_METHOD_DEFLATE) {
 372                 out = deflated = zlib_deflate_raw(buffer, size,
 373                                                   args->compression_level,
 374                                                   &compressed_size);
 375                 if (!out || compressed_size >= size) {
 376                         out = buffer;
 377                         method = ZIP_METHOD_STORE;
 378                         compressed_size = size;
 379                 }
 380         }
 381
 382         copy_le16(extra.magic, 0x5455);
 383         copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 384         extra.flags[0] = 1;     /* just mtime */
 385         copy_le32(extra.mtime, args->time);
 386
 387         if (size > 0xffffffff || compressed_size > 0xffffffff)
 388                 need_zip64_extra = 1;
 389         if (stream && size > 0x7fffffff)
 390                 need_zip64_extra = 1;
 391
 392         if (need_zip64_extra)
 393                 version_needed = 45;
 394
 395         copy_le32(header.magic, 0x04034b50);
 396         copy_le16(header.version, version_needed);
 397         copy_le16(header.flags, flags);
 398         copy_le16(header.compression_method, method);
 399         copy_le16(header.mtime, zip_time);
 400         copy_le16(header.mdate, zip_date);
 401         if (need_zip64_extra) {
 402                 set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 403                 header_extra_size += ZIP64_EXTRA_SIZE;
 404         } else {
 405                 set_zip_header_data_desc(&header, size, compressed_size, crc);
 406         }
 407         copy_le16(header.filename_length, pathlen);
 408         copy_le16(header.extra_length, header_extra_size);
 409         write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 410         zip_offset += ZIP_LOCAL_HEADER_SIZE;
 411         write_or_die(1, path, pathlen);
 412         zip_offset += pathlen;
 413         write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 414         zip_offset += ZIP_EXTRA_MTIME_SIZE;
 415         if (need_zip64_extra) {
 416                 copy_le16(extra64.magic, 0x0001);
 417                 copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 418                 copy_le64(extra64.size, size);
 419                 copy_le64(extra64.compressed_size, compressed_size);
 420                 write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 421                 zip_offset += ZIP64_EXTRA_SIZE;
 422         }
 423
 424         if (stream && method == ZIP_METHOD_STORE) {
 425                 unsigned char buf[STREAM_BUFFER_SIZE];
 426                 ssize_t readlen;
 427
 428                 for (;;) {
 429                         readlen = read_istream(stream, buf, sizeof(buf));
 430                         if (readlen <= 0)
 431                                 break;
 432                         crc = crc32(crc, buf, readlen);
 433                         if (is_binary == -1)
 434                                 is_binary = entry_is_binary(args->repo->index,
 435                                                             path_without_prefix,
 436                                                             buf, readlen);
 437                         write_or_die(1, buf, readlen);
 438                 }
 439                 close_istream(stream);
 440                 if (readlen)
 441                         return readlen;
 442
 443                 compressed_size = size;
 444                 zip_offset += compressed_size;
 445
 446                 write_zip_data_desc(size, compressed_size, crc);
 447         } else if (stream && method == ZIP_METHOD_DEFLATE) {
 448                 unsigned char buf[STREAM_BUFFER_SIZE];
 449                 ssize_t readlen;
 450                 git_zstream zstream;
 451                 int result;
 452                 size_t out_len;
 453                 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 454
 455                 git_deflate_init_raw(&zstream, args->compression_level);
 456
 457                 compressed_size = 0;
 458                 zstream.next_out = compressed;
 459                 zstream.avail_out = sizeof(compressed);
 460
 461                 for (;;) {
 462                         readlen = read_istream(stream, buf, sizeof(buf));
 463                         if (readlen <= 0)
 464                                 break;
 465                         crc = crc32(crc, buf, readlen);
 466                         if (is_binary == -1)
 467                                 is_binary = entry_is_binary(args->repo->index,
 468                                                             path_without_prefix,
 469                                                             buf, readlen);
 470
 471                         zstream.next_in = buf;
 472                         zstream.avail_in = readlen;
 473                         result = git_deflate(&zstream, 0);
 474                         if (result != Z_OK)
 475                                 die(_("deflate error (%d)"), result);
 476                         out_len = zstream.next_out - compressed;
 477
 478                         if (out_len > 0) {
 479                                 write_or_die(1, compressed, out_len);
 480                                 compressed_size += out_len;
 481                                 zstream.next_out = compressed;
 482                                 zstream.avail_out = sizeof(compressed);
 483                         }
 484
 485                 }
 486                 close_istream(stream);
 487                 if (readlen)
 488                         return readlen;
 489
 490                 zstream.next_in = buf;
 491                 zstream.avail_in = 0;
 492                 result = git_deflate(&zstream, Z_FINISH);
 493                 if (result != Z_STREAM_END)
 494                         die("deflate error (%d)", result);
 495
 496                 git_deflate_end(&zstream);
 497                 out_len = zstream.next_out - compressed;
 498                 write_or_die(1, compressed, out_len);
 499                 compressed_size += out_len;
 500                 zip_offset += compressed_size;
 501
 502                 write_zip_data_desc(size, compressed_size, crc);
 503         } else if (compressed_size > 0) {
 504                 write_or_die(1, out, compressed_size);
 505                 zip_offset += compressed_size;
 506         }
 507
 508         free(deflated);
 509
 510         if (compressed_size > 0xffffffff || size > 0xffffffff ||
 511             offset > 0xffffffff) {
 512                 if (compressed_size >= 0xffffffff)
 513                         zip64_dir_extra_payload_size += 8;
 514                 if (size >= 0xffffffff)
 515                         zip64_dir_extra_payload_size += 8;
 516                 if (offset >= 0xffffffff)
 517                         zip64_dir_extra_payload_size += 8;
 518                 zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 519         }
 520
 521         strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 522         strbuf_add_le(&zip_dir, 2, creator_version);
 523         strbuf_add_le(&zip_dir, 2, version_needed);
 524         strbuf_add_le(&zip_dir, 2, flags);
 525         strbuf_add_le(&zip_dir, 2, method);
 526         strbuf_add_le(&zip_dir, 2, zip_time);
 527         strbuf_add_le(&zip_dir, 2, zip_date);
 528         strbuf_add_le(&zip_dir, 4, crc);
 529         strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 530         strbuf_add_le(&zip_dir, 4, clamp32(size));
 531         strbuf_add_le(&zip_dir, 2, pathlen);
 532         strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 533         strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 534         strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 535         strbuf_add_le(&zip_dir, 2, !is_binary);
 536         strbuf_add_le(&zip_dir, 4, attr2);
 537         strbuf_add_le(&zip_dir, 4, clamp32(offset));
 538         strbuf_add(&zip_dir, path, pathlen);
 539         strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 540         if (zip64_dir_extra_payload_size) {
 541                 strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 542                 strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 543                 if (size >= 0xffffffff)
 544                         strbuf_add_le(&zip_dir, 8, size);
 545                 if (compressed_size >= 0xffffffff)
 546                         strbuf_add_le(&zip_dir, 8, compressed_size);
 547                 if (offset >= 0xffffffff)
 548                         strbuf_add_le(&zip_dir, 8, offset);
 549         }
 550         zip_dir_entries++;
 551
 552         return 0;
 553 }
 554
 555 static void write_zip64_trailer(void)
 556 {
 557         struct zip64_dir_trailer trailer64;
 558         struct zip64_dir_trailer_locator locator64;
 559
 560         copy_le32(trailer64.magic, 0x06064b50);
 561         copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 562         copy_le16(trailer64.creator_version, max_creator_version);
 563         copy_le16(trailer64.version, 45);
 564         copy_le32(trailer64.disk, 0);
 565         copy_le32(trailer64.directory_start_disk, 0);
 566         copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 567         copy_le64(trailer64.entries, zip_dir_entries);
 568         copy_le64(trailer64.size, zip_dir.len);
 569         copy_le64(trailer64.offset, zip_offset);
 570
 571         copy_le32(locator64.magic, 0x07064b50);
 572         copy_le32(locator64.disk, 0);
 573         copy_le64(locator64.offset, zip_offset + zip_dir.len);
 574         copy_le32(locator64.number_of_disks, 1);
 575
 576         write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 577         write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 578 }
 579
 580 static void write_zip_trailer(const struct object_id *oid)
 581 {
 582         struct zip_dir_trailer trailer;
 583         int clamped = 0;
 584
 585         copy_le32(trailer.magic, 0x06054b50);
 586         copy_le16(trailer.disk, 0);
 587         copy_le16(trailer.directory_start_disk, 0);
 588         copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 589                         &clamped);
 590         copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 591         copy_le32(trailer.size, zip_dir.len);
 592         copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 593         copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
 594
 595         write_or_die(1, zip_dir.buf, zip_dir.len);
 596         if (clamped)
 597                 write_zip64_trailer();
 598         write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 599         if (oid)
 600                 write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
 601 }
 602
 603 static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 604 {
 605         time_t time;
 606         struct tm tm;
 607
 608         if (date_overflows(*timestamp))
 609                 die(_("timestamp too large for this system: %"PRItime),
 610                     *timestamp);
 611         time = (time_t)*timestamp;
 612         localtime_r(&time, &tm);
 613         *timestamp = time;
 614
 615         *dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +
 616                     (tm.tm_year + 1900 - 1980) * 512;
 617         *dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;
 618 }
 619
 620 static int archive_zip_config(const char *var, const char *value,
 621                               const struct config_context *ctx UNUSED,
 622                               void *data UNUSED)
 623 {
 624         return userdiff_config(var, value);
 625 }
 626
 627 static int write_zip_archive(const struct archiver *ar UNUSED,
 628                              struct archiver_args *args)
 629 {
 630         int err;
 631
 632         git_config(archive_zip_config, NULL);
 633
 634         dos_time(&args->time, &zip_date, &zip_time);
 635
 636         strbuf_init(&zip_dir, 0);
 637
 638         err = write_archive_entries(args, write_zip_entry);
 639         if (!err)
 640                 write_zip_trailer(args->commit_oid);
 641
 642         strbuf_release(&zip_dir);
 643
 644         return err;
 645 }
 646
 647 static struct archiver zip_archiver = {
 648         .name = "zip",
 649         .write_archive = write_zip_archive,
 650         .flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
 651 };
 652
 653 void init_zip_archiver(void)
 654 {
 655         register_archiver(&zip_archiver);
 656 }