archive-zip.c

   1 /*
   2  * Copyright (c) 2006 Rene Scharfe
   3  */
   4
   5 #define USE_THE_REPOSITORY_VARIABLE
   6
   7 #include "git-compat-util.h"
   8 #include "config.h"
   9 #include "archive.h"
  10 #include "gettext.h"
  11 #include "git-zlib.h"
  12 #include "hex.h"
  13 #include "streaming.h"
  14 #include "utf8.h"
  15 #include "object-store-ll.h"
  16 #include "strbuf.h"
  17 #include "userdiff.h"
  18 #include "write-or-die.h"
  19 #include "xdiff-interface.h"
  20 #include "date.h"
  21
  22 static int zip_date;
  23 static int zip_time;
  24
  25 /* We only care about the "buf" part here. */
  26 static struct strbuf zip_dir;
  27
  28 static uintmax_t zip_offset;
  29 static uint64_t zip_dir_entries;
  30
  31 static unsigned int max_creator_version;
  32
  33 #define ZIP_STREAM      (1 <<  3)
  34 #define ZIP_UTF8        (1 << 11)
  35
  36 enum zip_method {
  37         ZIP_METHOD_STORE = 0,
  38         ZIP_METHOD_DEFLATE = 8
  39 };
  40
  41 struct zip_local_header {
  42         unsigned char magic[4];
  43         unsigned char version[2];
  44         unsigned char flags[2];
  45         unsigned char compression_method[2];
  46         unsigned char mtime[2];
  47         unsigned char mdate[2];
  48         unsigned char crc32[4];
  49         unsigned char compressed_size[4];
  50         unsigned char size[4];
  51         unsigned char filename_length[2];
  52         unsigned char extra_length[2];
  53         unsigned char _end[1];
  54 };
  55
  56 struct zip_data_desc {
  57         unsigned char magic[4];
  58         unsigned char crc32[4];
  59         unsigned char compressed_size[4];
  60         unsigned char size[4];
  61         unsigned char _end[1];
  62 };
  63
  64 struct zip64_data_desc {
  65         unsigned char magic[4];
  66         unsigned char crc32[4];
  67         unsigned char compressed_size[8];
  68         unsigned char size[8];
  69         unsigned char _end[1];
  70 };
  71
  72 struct zip_dir_trailer {
  73         unsigned char magic[4];
  74         unsigned char disk[2];
  75         unsigned char directory_start_disk[2];
  76         unsigned char entries_on_this_disk[2];
  77         unsigned char entries[2];
  78         unsigned char size[4];
  79         unsigned char offset[4];
  80         unsigned char comment_length[2];
  81         unsigned char _end[1];
  82 };
  83
  84 struct zip_extra_mtime {
  85         unsigned char magic[2];
  86         unsigned char extra_size[2];
  87         unsigned char flags[1];
  88         unsigned char mtime[4];
  89         unsigned char _end[1];
  90 };
  91
  92 struct zip64_extra {
  93         unsigned char magic[2];
  94         unsigned char extra_size[2];
  95         unsigned char size[8];
  96         unsigned char compressed_size[8];
  97         unsigned char _end[1];
  98 };
  99
 100 struct zip64_dir_trailer {
 101         unsigned char magic[4];
 102         unsigned char record_size[8];
 103         unsigned char creator_version[2];
 104         unsigned char version[2];
 105         unsigned char disk[4];
 106         unsigned char directory_start_disk[4];
 107         unsigned char entries_on_this_disk[8];
 108         unsigned char entries[8];
 109         unsigned char size[8];
 110         unsigned char offset[8];
 111         unsigned char _end[1];
 112 };
 113
 114 struct zip64_dir_trailer_locator {
 115         unsigned char magic[4];
 116         unsigned char disk[4];
 117         unsigned char offset[8];
 118         unsigned char number_of_disks[4];
 119         unsigned char _end[1];
 120 };
 121
 122 /*
 123  * On ARM, padding is added at the end of the struct, so a simple
 124  * sizeof(struct ...) reports two bytes more than the payload size
 125  * we're interested in.
 126  */
 127 #define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 128 #define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 129 #define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 130 #define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 131 #define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 132 #define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 133 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 134         (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 135 #define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 136 #define ZIP64_EXTRA_PAYLOAD_SIZE \
 137         (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 138 #define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 139 #define ZIP64_DIR_TRAILER_RECORD_SIZE \
 140         (ZIP64_DIR_TRAILER_SIZE - \
 141          offsetof(struct zip64_dir_trailer, creator_version))
 142 #define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 143         offsetof(struct zip64_dir_trailer_locator, _end)
 144
 145 static void copy_le16(unsigned char *dest, unsigned int n)
 146 {
 147         dest[0] = 0xff & n;
 148         dest[1] = 0xff & (n >> 010);
 149 }
 150
 151 static void copy_le32(unsigned char *dest, unsigned int n)
 152 {
 153         dest[0] = 0xff & n;
 154         dest[1] = 0xff & (n >> 010);
 155         dest[2] = 0xff & (n >> 020);
 156         dest[3] = 0xff & (n >> 030);
 157 }
 158
 159 static void copy_le64(unsigned char *dest, uint64_t n)
 160 {
 161         dest[0] = 0xff & n;
 162         dest[1] = 0xff & (n >> 010);
 163         dest[2] = 0xff & (n >> 020);
 164         dest[3] = 0xff & (n >> 030);
 165         dest[4] = 0xff & (n >> 040);
 166         dest[5] = 0xff & (n >> 050);
 167         dest[6] = 0xff & (n >> 060);
 168         dest[7] = 0xff & (n >> 070);
 169 }
 170
 171 static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 172 {
 173         if (n <= max)
 174                 return n;
 175         *clamped = 1;
 176         return max;
 177 }
 178
 179 static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 180 {
 181         copy_le16(dest, clamp_max(n, 0xffff, clamped));
 182 }
 183
 184 static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 185 {
 186         copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 187 }
 188
 189 static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 190 {
 191         while (size-- > 0) {
 192                 strbuf_addch(sb, n & 0xff);
 193                 n >>= 8;
 194         }
 195         return -!!n;
 196 }
 197
 198 static uint32_t clamp32(uintmax_t n)
 199 {
 200         const uintmax_t max = 0xffffffff;
 201         return (n < max) ? n : max;
 202 }
 203
 204 static void *zlib_deflate_raw(void *data, unsigned long size,
 205                               int compression_level,
 206                               unsigned long *compressed_size)
 207 {
 208         git_zstream stream;
 209         unsigned long maxsize;
 210         void *buffer;
 211         int result;
 212
 213         git_deflate_init_raw(&stream, compression_level);
 214         maxsize = git_deflate_bound(&stream, size);
 215         buffer = xmalloc(maxsize);
 216
 217         stream.next_in = data;
 218         stream.avail_in = size;
 219         stream.next_out = buffer;
 220         stream.avail_out = maxsize;
 221
 222         do {
 223                 result = git_deflate(&stream, Z_FINISH);
 224         } while (result == Z_OK);
 225
 226         if (result != Z_STREAM_END) {
 227                 free(buffer);
 228                 return NULL;
 229         }
 230
 231         git_deflate_end(&stream);
 232         *compressed_size = stream.total_out;
 233
 234         return buffer;
 235 }
 236
 237 static void write_zip_data_desc(unsigned long size,
 238                                 unsigned long compressed_size,
 239                                 unsigned long crc)
 240 {
 241         if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 242                 struct zip64_data_desc trailer;
 243                 copy_le32(trailer.magic, 0x08074b50);
 244                 copy_le32(trailer.crc32, crc);
 245                 copy_le64(trailer.compressed_size, compressed_size);
 246                 copy_le64(trailer.size, size);
 247                 write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 248                 zip_offset += ZIP64_DATA_DESC_SIZE;
 249         } else {
 250                 struct zip_data_desc trailer;
 251                 copy_le32(trailer.magic, 0x08074b50);
 252                 copy_le32(trailer.crc32, crc);
 253                 copy_le32(trailer.compressed_size, compressed_size);
 254                 copy_le32(trailer.size, size);
 255                 write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 256                 zip_offset += ZIP_DATA_DESC_SIZE;
 257         }
 258 }
 259
 260 static void set_zip_header_data_desc(struct zip_local_header *header,
 261                                      unsigned long size,
 262                                      unsigned long compressed_size,
 263                                      unsigned long crc)
 264 {
 265         copy_le32(header->crc32, crc);
 266         copy_le32(header->compressed_size, compressed_size);
 267         copy_le32(header->size, size);
 268 }
 269
 270 static int has_only_ascii(const char *s)
 271 {
 272         for (;;) {
 273                 int c = *s++;
 274                 if (c == '\0')
 275                         return 1;
 276                 if (!isascii(c))
 277                         return 0;
 278         }
 279 }
 280
 281 static int entry_is_binary(struct index_state *istate, const char *path,
 282                            const void *buffer, size_t size)
 283 {
 284         struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
 285         if (!driver)
 286                 driver = userdiff_find_by_name("default");
 287         if (driver->binary != -1)
 288                 return driver->binary;
 289         return buffer_is_binary(buffer, size);
 290 }
 291
 292 #define STREAM_BUFFER_SIZE (1024 * 16)
 293
 294 static int write_zip_entry(struct archiver_args *args,
 295                            const struct object_id *oid,
 296                            const char *path, size_t pathlen,
 297                            unsigned int mode,
 298                            void *buffer, unsigned long size)
 299 {
 300         struct zip_local_header header;
 301         uintmax_t offset = zip_offset;
 302         struct zip_extra_mtime extra;
 303         struct zip64_extra extra64;
 304         size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 305         int need_zip64_extra = 0;
 306         unsigned long attr2;
 307         unsigned long compressed_size;
 308         unsigned long crc;
 309         enum zip_method method;
 310         unsigned char *out;
 311         void *deflated = NULL;
 312         struct git_istream *stream = NULL;
 313         unsigned long flags = 0;
 314         int is_binary = -1;
 315         const char *path_without_prefix = path + args->baselen;
 316         unsigned int creator_version = 0;
 317         unsigned int version_needed = 10;
 318         size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 319         size_t zip64_dir_extra_payload_size = 0;
 320
 321         crc = crc32(0, NULL, 0);
 322
 323         if (!has_only_ascii(path)) {
 324                 if (is_utf8(path))
 325                         flags |= ZIP_UTF8;
 326                 else
 327                         warning(_("path is not valid UTF-8: %s"), path);
 328         }
 329
 330         if (pathlen > 0xffff) {
 331                 return error(_("path too long (%d chars, SHA1: %s): %s"),
 332                                 (int)pathlen, oid_to_hex(oid), path);
 333         }
 334
 335         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 336                 method = ZIP_METHOD_STORE;
 337                 attr2 = 16;
 338                 out = NULL;
 339                 compressed_size = 0;
 340         } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 341                 method = ZIP_METHOD_STORE;
 342                 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 343                         (mode & 0111) ? ((mode) << 16) : 0;
 344                 if (S_ISLNK(mode) || (mode & 0111))
 345                         creator_version = 0x0317;
 346                 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 347                         method = ZIP_METHOD_DEFLATE;
 348
 349                 if (!buffer) {
 350                         enum object_type type;
 351                         stream = open_istream(args->repo, oid, &type, &size,
 352                                               NULL);
 353                         if (!stream)
 354                                 return error(_("cannot stream blob %s"),
 355                                              oid_to_hex(oid));
 356                         flags |= ZIP_STREAM;
 357                         out = NULL;
 358                 } else {
 359                         crc = crc32(crc, buffer, size);
 360                         is_binary = entry_is_binary(args->repo->index,
 361                                                     path_without_prefix,
 362                                                     buffer, size);
 363                         out = buffer;
 364                 }
 365                 compressed_size = (method == ZIP_METHOD_STORE) ? size : 0;
 366         } else {
 367                 return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
 368                                 oid_to_hex(oid));
 369         }
 370
 371         if (creator_version > max_creator_version)
 372                 max_creator_version = creator_version;
 373
 374         if (buffer && method == ZIP_METHOD_DEFLATE) {
 375                 out = deflated = zlib_deflate_raw(buffer, size,
 376                                                   args->compression_level,
 377                                                   &compressed_size);
 378                 if (!out || compressed_size >= size) {
 379                         out = buffer;
 380                         method = ZIP_METHOD_STORE;
 381                         compressed_size = size;
 382                 }
 383         }
 384
 385         copy_le16(extra.magic, 0x5455);
 386         copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 387         extra.flags[0] = 1;     /* just mtime */
 388         copy_le32(extra.mtime, args->time);
 389
 390         if (size > 0xffffffff || compressed_size > 0xffffffff)
 391                 need_zip64_extra = 1;
 392         if (stream && size > 0x7fffffff)
 393                 need_zip64_extra = 1;
 394
 395         if (need_zip64_extra)
 396                 version_needed = 45;
 397
 398         copy_le32(header.magic, 0x04034b50);
 399         copy_le16(header.version, version_needed);
 400         copy_le16(header.flags, flags);
 401         copy_le16(header.compression_method, method);
 402         copy_le16(header.mtime, zip_time);
 403         copy_le16(header.mdate, zip_date);
 404         if (need_zip64_extra) {
 405                 set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 406                 header_extra_size += ZIP64_EXTRA_SIZE;
 407         } else {
 408                 set_zip_header_data_desc(&header, size, compressed_size, crc);
 409         }
 410         copy_le16(header.filename_length, pathlen);
 411         copy_le16(header.extra_length, header_extra_size);
 412         write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 413         zip_offset += ZIP_LOCAL_HEADER_SIZE;
 414         write_or_die(1, path, pathlen);
 415         zip_offset += pathlen;
 416         write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 417         zip_offset += ZIP_EXTRA_MTIME_SIZE;
 418         if (need_zip64_extra) {
 419                 copy_le16(extra64.magic, 0x0001);
 420                 copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 421                 copy_le64(extra64.size, size);
 422                 copy_le64(extra64.compressed_size, compressed_size);
 423                 write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 424                 zip_offset += ZIP64_EXTRA_SIZE;
 425         }
 426
 427         if (stream && method == ZIP_METHOD_STORE) {
 428                 unsigned char buf[STREAM_BUFFER_SIZE];
 429                 ssize_t readlen;
 430
 431                 for (;;) {
 432                         readlen = read_istream(stream, buf, sizeof(buf));
 433                         if (readlen <= 0)
 434                                 break;
 435                         crc = crc32(crc, buf, readlen);
 436                         if (is_binary == -1)
 437                                 is_binary = entry_is_binary(args->repo->index,
 438                                                             path_without_prefix,
 439                                                             buf, readlen);
 440                         write_or_die(1, buf, readlen);
 441                 }
 442                 close_istream(stream);
 443                 if (readlen)
 444                         return readlen;
 445
 446                 compressed_size = size;
 447                 zip_offset += compressed_size;
 448
 449                 write_zip_data_desc(size, compressed_size, crc);
 450         } else if (stream && method == ZIP_METHOD_DEFLATE) {
 451                 unsigned char buf[STREAM_BUFFER_SIZE];
 452                 ssize_t readlen;
 453                 git_zstream zstream;
 454                 int result;
 455                 size_t out_len;
 456                 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 457
 458                 git_deflate_init_raw(&zstream, args->compression_level);
 459
 460                 compressed_size = 0;
 461                 zstream.next_out = compressed;
 462                 zstream.avail_out = sizeof(compressed);
 463
 464                 for (;;) {
 465                         readlen = read_istream(stream, buf, sizeof(buf));
 466                         if (readlen <= 0)
 467                                 break;
 468                         crc = crc32(crc, buf, readlen);
 469                         if (is_binary == -1)
 470                                 is_binary = entry_is_binary(args->repo->index,
 471                                                             path_without_prefix,
 472                                                             buf, readlen);
 473
 474                         zstream.next_in = buf;
 475                         zstream.avail_in = readlen;
 476                         result = git_deflate(&zstream, 0);
 477                         if (result != Z_OK)
 478                                 die(_("deflate error (%d)"), result);
 479                         out_len = zstream.next_out - compressed;
 480
 481                         if (out_len > 0) {
 482                                 write_or_die(1, compressed, out_len);
 483                                 compressed_size += out_len;
 484                                 zstream.next_out = compressed;
 485                                 zstream.avail_out = sizeof(compressed);
 486                         }
 487
 488                 }
 489                 close_istream(stream);
 490                 if (readlen)
 491                         return readlen;
 492
 493                 zstream.next_in = buf;
 494                 zstream.avail_in = 0;
 495                 result = git_deflate(&zstream, Z_FINISH);
 496                 if (result != Z_STREAM_END)
 497                         die("deflate error (%d)", result);
 498
 499                 git_deflate_end(&zstream);
 500                 out_len = zstream.next_out - compressed;
 501                 write_or_die(1, compressed, out_len);
 502                 compressed_size += out_len;
 503                 zip_offset += compressed_size;
 504
 505                 write_zip_data_desc(size, compressed_size, crc);
 506         } else if (compressed_size > 0) {
 507                 write_or_die(1, out, compressed_size);
 508                 zip_offset += compressed_size;
 509         }
 510
 511         free(deflated);
 512
 513         if (compressed_size > 0xffffffff || size > 0xffffffff ||
 514             offset > 0xffffffff) {
 515                 if (compressed_size >= 0xffffffff)
 516                         zip64_dir_extra_payload_size += 8;
 517                 if (size >= 0xffffffff)
 518                         zip64_dir_extra_payload_size += 8;
 519                 if (offset >= 0xffffffff)
 520                         zip64_dir_extra_payload_size += 8;
 521                 zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 522         }
 523
 524         strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 525         strbuf_add_le(&zip_dir, 2, creator_version);
 526         strbuf_add_le(&zip_dir, 2, version_needed);
 527         strbuf_add_le(&zip_dir, 2, flags);
 528         strbuf_add_le(&zip_dir, 2, method);
 529         strbuf_add_le(&zip_dir, 2, zip_time);
 530         strbuf_add_le(&zip_dir, 2, zip_date);
 531         strbuf_add_le(&zip_dir, 4, crc);
 532         strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 533         strbuf_add_le(&zip_dir, 4, clamp32(size));
 534         strbuf_add_le(&zip_dir, 2, pathlen);
 535         strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 536         strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 537         strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 538         strbuf_add_le(&zip_dir, 2, !is_binary);
 539         strbuf_add_le(&zip_dir, 4, attr2);
 540         strbuf_add_le(&zip_dir, 4, clamp32(offset));
 541         strbuf_add(&zip_dir, path, pathlen);
 542         strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 543         if (zip64_dir_extra_payload_size) {
 544                 strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 545                 strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 546                 if (size >= 0xffffffff)
 547                         strbuf_add_le(&zip_dir, 8, size);
 548                 if (compressed_size >= 0xffffffff)
 549                         strbuf_add_le(&zip_dir, 8, compressed_size);
 550                 if (offset >= 0xffffffff)
 551                         strbuf_add_le(&zip_dir, 8, offset);
 552         }
 553         zip_dir_entries++;
 554
 555         return 0;
 556 }
 557
 558 static void write_zip64_trailer(void)
 559 {
 560         struct zip64_dir_trailer trailer64;
 561         struct zip64_dir_trailer_locator locator64;
 562
 563         copy_le32(trailer64.magic, 0x06064b50);
 564         copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 565         copy_le16(trailer64.creator_version, max_creator_version);
 566         copy_le16(trailer64.version, 45);
 567         copy_le32(trailer64.disk, 0);
 568         copy_le32(trailer64.directory_start_disk, 0);
 569         copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 570         copy_le64(trailer64.entries, zip_dir_entries);
 571         copy_le64(trailer64.size, zip_dir.len);
 572         copy_le64(trailer64.offset, zip_offset);
 573
 574         copy_le32(locator64.magic, 0x07064b50);
 575         copy_le32(locator64.disk, 0);
 576         copy_le64(locator64.offset, zip_offset + zip_dir.len);
 577         copy_le32(locator64.number_of_disks, 1);
 578
 579         write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 580         write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 581 }
 582
 583 static void write_zip_trailer(const struct object_id *oid)
 584 {
 585         struct zip_dir_trailer trailer;
 586         int clamped = 0;
 587
 588         copy_le32(trailer.magic, 0x06054b50);
 589         copy_le16(trailer.disk, 0);
 590         copy_le16(trailer.directory_start_disk, 0);
 591         copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 592                         &clamped);
 593         copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 594         copy_le32(trailer.size, zip_dir.len);
 595         copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 596         copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
 597
 598         write_or_die(1, zip_dir.buf, zip_dir.len);
 599         if (clamped)
 600                 write_zip64_trailer();
 601         write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 602         if (oid)
 603                 write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
 604 }
 605
 606 static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 607 {
 608         time_t time;
 609         struct tm tm;
 610
 611         if (date_overflows(*timestamp))
 612                 die(_("timestamp too large for this system: %"PRItime),
 613                     *timestamp);
 614         time = (time_t)*timestamp;
 615         localtime_r(&time, &tm);
 616         *timestamp = time;
 617
 618         *dos_date = tm.tm_mday + (tm.tm_mon + 1) * 32 +
 619                     (tm.tm_year + 1900 - 1980) * 512;
 620         *dos_time = tm.tm_sec / 2 + tm.tm_min * 32 + tm.tm_hour * 2048;
 621 }
 622
 623 static int archive_zip_config(const char *var, const char *value,
 624                               const struct config_context *ctx UNUSED,
 625                               void *data UNUSED)
 626 {
 627         return userdiff_config(var, value);
 628 }
 629
 630 static int write_zip_archive(const struct archiver *ar UNUSED,
 631                              struct archiver_args *args)
 632 {
 633         int err;
 634
 635         git_config(archive_zip_config, NULL);
 636
 637         dos_time(&args->time, &zip_date, &zip_time);
 638
 639         strbuf_init(&zip_dir, 0);
 640
 641         err = write_archive_entries(args, write_zip_entry);
 642         if (!err)
 643                 write_zip_trailer(args->commit_oid);
 644
 645         strbuf_release(&zip_dir);
 646
 647         return err;
 648 }
 649
 650 static struct archiver zip_archiver = {
 651         .name = "zip",
 652         .write_archive = write_zip_archive,
 653         .flags = ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE,
 654 };
 655
 656 void init_zip_archiver(void)
 657 {
 658         register_archiver(&zip_archiver);
 659 }