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