Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include "cache.h"
   5#include "archive.h"
   6#include "streaming.h"
   7#include "utf8.h"
   8#include "userdiff.h"
   9#include "xdiff-interface.h"
  10
  11static int zip_date;
  12static int zip_time;
  13
  14/* We only care about the "buf" part here. */
  15static struct strbuf zip_dir;
  16
  17static uintmax_t zip_offset;
  18static uint64_t zip_dir_entries;
  19
  20static unsigned int max_creator_version;
  21
  22#define ZIP_STREAM      (1 <<  3)
  23#define ZIP_UTF8        (1 << 11)
  24
  25struct zip_local_header {
  26        unsigned char magic[4];
  27        unsigned char version[2];
  28        unsigned char flags[2];
  29        unsigned char compression_method[2];
  30        unsigned char mtime[2];
  31        unsigned char mdate[2];
  32        unsigned char crc32[4];
  33        unsigned char compressed_size[4];
  34        unsigned char size[4];
  35        unsigned char filename_length[2];
  36        unsigned char extra_length[2];
  37        unsigned char _end[1];
  38};
  39
  40struct zip_data_desc {
  41        unsigned char magic[4];
  42        unsigned char crc32[4];
  43        unsigned char compressed_size[4];
  44        unsigned char size[4];
  45        unsigned char _end[1];
  46};
  47
  48struct zip64_data_desc {
  49        unsigned char magic[4];
  50        unsigned char crc32[4];
  51        unsigned char compressed_size[8];
  52        unsigned char size[8];
  53        unsigned char _end[1];
  54};
  55
  56struct zip_dir_trailer {
  57        unsigned char magic[4];
  58        unsigned char disk[2];
  59        unsigned char directory_start_disk[2];
  60        unsigned char entries_on_this_disk[2];
  61        unsigned char entries[2];
  62        unsigned char size[4];
  63        unsigned char offset[4];
  64        unsigned char comment_length[2];
  65        unsigned char _end[1];
  66};
  67
  68struct zip_extra_mtime {
  69        unsigned char magic[2];
  70        unsigned char extra_size[2];
  71        unsigned char flags[1];
  72        unsigned char mtime[4];
  73        unsigned char _end[1];
  74};
  75
  76struct zip64_extra {
  77        unsigned char magic[2];
  78        unsigned char extra_size[2];
  79        unsigned char size[8];
  80        unsigned char compressed_size[8];
  81        unsigned char _end[1];
  82};
  83
  84struct zip64_dir_trailer {
  85        unsigned char magic[4];
  86        unsigned char record_size[8];
  87        unsigned char creator_version[2];
  88        unsigned char version[2];
  89        unsigned char disk[4];
  90        unsigned char directory_start_disk[4];
  91        unsigned char entries_on_this_disk[8];
  92        unsigned char entries[8];
  93        unsigned char size[8];
  94        unsigned char offset[8];
  95        unsigned char _end[1];
  96};
  97
  98struct zip64_dir_trailer_locator {
  99        unsigned char magic[4];
 100        unsigned char disk[4];
 101        unsigned char offset[8];
 102        unsigned char number_of_disks[4];
 103        unsigned char _end[1];
 104};
 105
 106/*
 107 * On ARM, padding is added at the end of the struct, so a simple
 108 * sizeof(struct ...) reports two bytes more than the payload size
 109 * we're interested in.
 110 */
 111#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 112#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 113#define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 114#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 115#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 116#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 117#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 118        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 119#define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 120#define ZIP64_EXTRA_PAYLOAD_SIZE \
 121        (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 122#define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 123#define ZIP64_DIR_TRAILER_RECORD_SIZE \
 124        (ZIP64_DIR_TRAILER_SIZE - \
 125         offsetof(struct zip64_dir_trailer, creator_version))
 126#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 127        offsetof(struct zip64_dir_trailer_locator, _end)
 128
 129static void copy_le16(unsigned char *dest, unsigned int n)
 130{
 131        dest[0] = 0xff & n;
 132        dest[1] = 0xff & (n >> 010);
 133}
 134
 135static void copy_le32(unsigned char *dest, unsigned int n)
 136{
 137        dest[0] = 0xff & n;
 138        dest[1] = 0xff & (n >> 010);
 139        dest[2] = 0xff & (n >> 020);
 140        dest[3] = 0xff & (n >> 030);
 141}
 142
 143static void copy_le64(unsigned char *dest, uint64_t n)
 144{
 145        dest[0] = 0xff & n;
 146        dest[1] = 0xff & (n >> 010);
 147        dest[2] = 0xff & (n >> 020);
 148        dest[3] = 0xff & (n >> 030);
 149        dest[4] = 0xff & (n >> 040);
 150        dest[5] = 0xff & (n >> 050);
 151        dest[6] = 0xff & (n >> 060);
 152        dest[7] = 0xff & (n >> 070);
 153}
 154
 155static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 156{
 157        if (n <= max)
 158                return n;
 159        *clamped = 1;
 160        return max;
 161}
 162
 163static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 164{
 165        copy_le16(dest, clamp_max(n, 0xffff, clamped));
 166}
 167
 168static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 169{
 170        copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 171}
 172
 173static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 174{
 175        while (size-- > 0) {
 176                strbuf_addch(sb, n & 0xff);
 177                n >>= 8;
 178        }
 179        return -!!n;
 180}
 181
 182static uint32_t clamp32(uintmax_t n)
 183{
 184        const uintmax_t max = 0xffffffff;
 185        return (n < max) ? n : max;
 186}
 187
 188static void *zlib_deflate_raw(void *data, unsigned long size,
 189                              int compression_level,
 190                              unsigned long *compressed_size)
 191{
 192        git_zstream stream;
 193        unsigned long maxsize;
 194        void *buffer;
 195        int result;
 196
 197        git_deflate_init_raw(&stream, compression_level);
 198        maxsize = git_deflate_bound(&stream, size);
 199        buffer = xmalloc(maxsize);
 200
 201        stream.next_in = data;
 202        stream.avail_in = size;
 203        stream.next_out = buffer;
 204        stream.avail_out = maxsize;
 205
 206        do {
 207                result = git_deflate(&stream, Z_FINISH);
 208        } while (result == Z_OK);
 209
 210        if (result != Z_STREAM_END) {
 211                free(buffer);
 212                return NULL;
 213        }
 214
 215        git_deflate_end(&stream);
 216        *compressed_size = stream.total_out;
 217
 218        return buffer;
 219}
 220
 221static void write_zip_data_desc(unsigned long size,
 222                                unsigned long compressed_size,
 223                                unsigned long crc)
 224{
 225        if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 226                struct zip64_data_desc trailer;
 227                copy_le32(trailer.magic, 0x08074b50);
 228                copy_le32(trailer.crc32, crc);
 229                copy_le64(trailer.compressed_size, compressed_size);
 230                copy_le64(trailer.size, size);
 231                write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 232                zip_offset += ZIP64_DATA_DESC_SIZE;
 233        } else {
 234                struct zip_data_desc trailer;
 235                copy_le32(trailer.magic, 0x08074b50);
 236                copy_le32(trailer.crc32, crc);
 237                copy_le32(trailer.compressed_size, compressed_size);
 238                copy_le32(trailer.size, size);
 239                write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 240                zip_offset += ZIP_DATA_DESC_SIZE;
 241        }
 242}
 243
 244static void set_zip_header_data_desc(struct zip_local_header *header,
 245                                     unsigned long size,
 246                                     unsigned long compressed_size,
 247                                     unsigned long crc)
 248{
 249        copy_le32(header->crc32, crc);
 250        copy_le32(header->compressed_size, compressed_size);
 251        copy_le32(header->size, size);
 252}
 253
 254static int has_only_ascii(const char *s)
 255{
 256        for (;;) {
 257                int c = *s++;
 258                if (c == '\0')
 259                        return 1;
 260                if (!isascii(c))
 261                        return 0;
 262        }
 263}
 264
 265static int entry_is_binary(const char *path, const void *buffer, size_t size)
 266{
 267        struct userdiff_driver *driver = userdiff_find_by_path(path);
 268        if (!driver)
 269                driver = userdiff_find_by_name("default");
 270        if (driver->binary != -1)
 271                return driver->binary;
 272        return buffer_is_binary(buffer, size);
 273}
 274
 275#define STREAM_BUFFER_SIZE (1024 * 16)
 276
 277static int write_zip_entry(struct archiver_args *args,
 278                           const unsigned char *sha1,
 279                           const char *path, size_t pathlen,
 280                           unsigned int mode)
 281{
 282        struct zip_local_header header;
 283        uintmax_t offset = zip_offset;
 284        struct zip_extra_mtime extra;
 285        struct zip64_extra extra64;
 286        size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 287        int need_zip64_extra = 0;
 288        unsigned long attr2;
 289        unsigned long compressed_size;
 290        unsigned long crc;
 291        int method;
 292        unsigned char *out;
 293        void *deflated = NULL;
 294        void *buffer;
 295        struct git_istream *stream = NULL;
 296        unsigned long flags = 0;
 297        unsigned long size;
 298        int is_binary = -1;
 299        const char *path_without_prefix = path + args->baselen;
 300        unsigned int creator_version = 0;
 301        unsigned int version_needed = 10;
 302        size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 303        size_t zip64_dir_extra_payload_size = 0;
 304
 305        crc = crc32(0, NULL, 0);
 306
 307        if (!has_only_ascii(path)) {
 308                if (is_utf8(path))
 309                        flags |= ZIP_UTF8;
 310                else
 311                        warning("Path is not valid UTF-8: %s", path);
 312        }
 313
 314        if (pathlen > 0xffff) {
 315                return error("path too long (%d chars, SHA1: %s): %s",
 316                                (int)pathlen, sha1_to_hex(sha1), path);
 317        }
 318
 319        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 320                method = 0;
 321                attr2 = 16;
 322                out = NULL;
 323                size = 0;
 324                compressed_size = 0;
 325                buffer = NULL;
 326        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 327                enum object_type type = sha1_object_info(sha1, &size);
 328
 329                method = 0;
 330                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 331                        (mode & 0111) ? ((mode) << 16) : 0;
 332                if (S_ISLNK(mode) || (mode & 0111))
 333                        creator_version = 0x0317;
 334                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 335                        method = 8;
 336
 337                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 338                    size > big_file_threshold) {
 339                        stream = open_istream(sha1, &type, &size, NULL);
 340                        if (!stream)
 341                                return error("cannot stream blob %s",
 342                                             sha1_to_hex(sha1));
 343                        flags |= ZIP_STREAM;
 344                        out = buffer = NULL;
 345                } else {
 346                        buffer = sha1_file_to_archive(args, path, sha1, mode,
 347                                                      &type, &size);
 348                        if (!buffer)
 349                                return error("cannot read %s",
 350                                             sha1_to_hex(sha1));
 351                        crc = crc32(crc, buffer, size);
 352                        is_binary = entry_is_binary(path_without_prefix,
 353                                                    buffer, size);
 354                        out = buffer;
 355                }
 356                compressed_size = (method == 0) ? size : 0;
 357        } else {
 358                return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 359                                sha1_to_hex(sha1));
 360        }
 361
 362        if (creator_version > max_creator_version)
 363                max_creator_version = creator_version;
 364
 365        if (buffer && method == 8) {
 366                out = deflated = zlib_deflate_raw(buffer, size,
 367                                                  args->compression_level,
 368                                                  &compressed_size);
 369                if (!out || compressed_size >= size) {
 370                        out = buffer;
 371                        method = 0;
 372                        compressed_size = size;
 373                }
 374        }
 375
 376        copy_le16(extra.magic, 0x5455);
 377        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 378        extra.flags[0] = 1;     /* just mtime */
 379        copy_le32(extra.mtime, args->time);
 380
 381        if (size > 0xffffffff || compressed_size > 0xffffffff)
 382                need_zip64_extra = 1;
 383        if (stream && size > 0x7fffffff)
 384                need_zip64_extra = 1;
 385
 386        if (need_zip64_extra)
 387                version_needed = 45;
 388
 389        copy_le32(header.magic, 0x04034b50);
 390        copy_le16(header.version, version_needed);
 391        copy_le16(header.flags, flags);
 392        copy_le16(header.compression_method, method);
 393        copy_le16(header.mtime, zip_time);
 394        copy_le16(header.mdate, zip_date);
 395        if (need_zip64_extra) {
 396                set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 397                header_extra_size += ZIP64_EXTRA_SIZE;
 398        } else {
 399                set_zip_header_data_desc(&header, size, compressed_size, crc);
 400        }
 401        copy_le16(header.filename_length, pathlen);
 402        copy_le16(header.extra_length, header_extra_size);
 403        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 404        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 405        write_or_die(1, path, pathlen);
 406        zip_offset += pathlen;
 407        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 408        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 409        if (need_zip64_extra) {
 410                copy_le16(extra64.magic, 0x0001);
 411                copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 412                copy_le64(extra64.size, size);
 413                copy_le64(extra64.compressed_size, compressed_size);
 414                write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 415                zip_offset += ZIP64_EXTRA_SIZE;
 416        }
 417
 418        if (stream && method == 0) {
 419                unsigned char buf[STREAM_BUFFER_SIZE];
 420                ssize_t readlen;
 421
 422                for (;;) {
 423                        readlen = read_istream(stream, buf, sizeof(buf));
 424                        if (readlen <= 0)
 425                                break;
 426                        crc = crc32(crc, buf, readlen);
 427                        if (is_binary == -1)
 428                                is_binary = entry_is_binary(path_without_prefix,
 429                                                            buf, readlen);
 430                        write_or_die(1, buf, readlen);
 431                }
 432                close_istream(stream);
 433                if (readlen)
 434                        return readlen;
 435
 436                compressed_size = size;
 437                zip_offset += compressed_size;
 438
 439                write_zip_data_desc(size, compressed_size, crc);
 440        } else if (stream && method == 8) {
 441                unsigned char buf[STREAM_BUFFER_SIZE];
 442                ssize_t readlen;
 443                git_zstream zstream;
 444                int result;
 445                size_t out_len;
 446                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 447
 448                git_deflate_init_raw(&zstream, args->compression_level);
 449
 450                compressed_size = 0;
 451                zstream.next_out = compressed;
 452                zstream.avail_out = sizeof(compressed);
 453
 454                for (;;) {
 455                        readlen = read_istream(stream, buf, sizeof(buf));
 456                        if (readlen <= 0)
 457                                break;
 458                        crc = crc32(crc, buf, readlen);
 459                        if (is_binary == -1)
 460                                is_binary = entry_is_binary(path_without_prefix,
 461                                                            buf, readlen);
 462
 463                        zstream.next_in = buf;
 464                        zstream.avail_in = readlen;
 465                        result = git_deflate(&zstream, 0);
 466                        if (result != Z_OK)
 467                                die("deflate error (%d)", result);
 468                        out_len = zstream.next_out - compressed;
 469
 470                        if (out_len > 0) {
 471                                write_or_die(1, compressed, out_len);
 472                                compressed_size += out_len;
 473                                zstream.next_out = compressed;
 474                                zstream.avail_out = sizeof(compressed);
 475                        }
 476
 477                }
 478                close_istream(stream);
 479                if (readlen)
 480                        return readlen;
 481
 482                zstream.next_in = buf;
 483                zstream.avail_in = 0;
 484                result = git_deflate(&zstream, Z_FINISH);
 485                if (result != Z_STREAM_END)
 486                        die("deflate error (%d)", result);
 487
 488                git_deflate_end(&zstream);
 489                out_len = zstream.next_out - compressed;
 490                write_or_die(1, compressed, out_len);
 491                compressed_size += out_len;
 492                zip_offset += compressed_size;
 493
 494                write_zip_data_desc(size, compressed_size, crc);
 495        } else if (compressed_size > 0) {
 496                write_or_die(1, out, compressed_size);
 497                zip_offset += compressed_size;
 498        }
 499
 500        free(deflated);
 501        free(buffer);
 502
 503        if (compressed_size > 0xffffffff || size > 0xffffffff ||
 504            offset > 0xffffffff) {
 505                if (compressed_size >= 0xffffffff)
 506                        zip64_dir_extra_payload_size += 8;
 507                if (size >= 0xffffffff)
 508                        zip64_dir_extra_payload_size += 8;
 509                if (offset >= 0xffffffff)
 510                        zip64_dir_extra_payload_size += 8;
 511                zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 512        }
 513
 514        strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 515        strbuf_add_le(&zip_dir, 2, creator_version);
 516        strbuf_add_le(&zip_dir, 2, version_needed);
 517        strbuf_add_le(&zip_dir, 2, flags);
 518        strbuf_add_le(&zip_dir, 2, method);
 519        strbuf_add_le(&zip_dir, 2, zip_time);
 520        strbuf_add_le(&zip_dir, 2, zip_date);
 521        strbuf_add_le(&zip_dir, 4, crc);
 522        strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 523        strbuf_add_le(&zip_dir, 4, clamp32(size));
 524        strbuf_add_le(&zip_dir, 2, pathlen);
 525        strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 526        strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 527        strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 528        strbuf_add_le(&zip_dir, 2, !is_binary);
 529        strbuf_add_le(&zip_dir, 4, attr2);
 530        strbuf_add_le(&zip_dir, 4, clamp32(offset));
 531        strbuf_add(&zip_dir, path, pathlen);
 532        strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 533        if (zip64_dir_extra_payload_size) {
 534                strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 535                strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 536                if (size >= 0xffffffff)
 537                        strbuf_add_le(&zip_dir, 8, size);
 538                if (compressed_size >= 0xffffffff)
 539                        strbuf_add_le(&zip_dir, 8, compressed_size);
 540                if (offset >= 0xffffffff)
 541                        strbuf_add_le(&zip_dir, 8, offset);
 542        }
 543        zip_dir_entries++;
 544
 545        return 0;
 546}
 547
 548static void write_zip64_trailer(void)
 549{
 550        struct zip64_dir_trailer trailer64;
 551        struct zip64_dir_trailer_locator locator64;
 552
 553        copy_le32(trailer64.magic, 0x06064b50);
 554        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 555        copy_le16(trailer64.creator_version, max_creator_version);
 556        copy_le16(trailer64.version, 45);
 557        copy_le32(trailer64.disk, 0);
 558        copy_le32(trailer64.directory_start_disk, 0);
 559        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 560        copy_le64(trailer64.entries, zip_dir_entries);
 561        copy_le64(trailer64.size, zip_dir.len);
 562        copy_le64(trailer64.offset, zip_offset);
 563
 564        copy_le32(locator64.magic, 0x07064b50);
 565        copy_le32(locator64.disk, 0);
 566        copy_le64(locator64.offset, zip_offset + zip_dir.len);
 567        copy_le32(locator64.number_of_disks, 1);
 568
 569        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 570        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 571}
 572
 573static void write_zip_trailer(const unsigned char *sha1)
 574{
 575        struct zip_dir_trailer trailer;
 576        int clamped = 0;
 577
 578        copy_le32(trailer.magic, 0x06054b50);
 579        copy_le16(trailer.disk, 0);
 580        copy_le16(trailer.directory_start_disk, 0);
 581        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 582                        &clamped);
 583        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 584        copy_le32(trailer.size, zip_dir.len);
 585        copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 586        copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 587
 588        write_or_die(1, zip_dir.buf, zip_dir.len);
 589        if (clamped)
 590                write_zip64_trailer();
 591        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 592        if (sha1)
 593                write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 594}
 595
 596static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 597{
 598        time_t time;
 599        struct tm *t;
 600
 601        if (date_overflows(*timestamp))
 602                die("timestamp too large for this system: %"PRItime,
 603                    *timestamp);
 604        time = (time_t)*timestamp;
 605        t = localtime(&time);
 606        *timestamp = time;
 607
 608        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 609                    (t->tm_year + 1900 - 1980) * 512;
 610        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 611}
 612
 613static int archive_zip_config(const char *var, const char *value, void *data)
 614{
 615        return userdiff_config(var, value);
 616}
 617
 618static int write_zip_archive(const struct archiver *ar,
 619                             struct archiver_args *args)
 620{
 621        int err;
 622
 623        git_config(archive_zip_config, NULL);
 624
 625        dos_time(&args->time, &zip_date, &zip_time);
 626
 627        strbuf_init(&zip_dir, 0);
 628
 629        err = write_archive_entries(args, write_zip_entry);
 630        if (!err)
 631                write_zip_trailer(args->commit_sha1);
 632
 633        strbuf_release(&zip_dir);
 634
 635        return err;
 636}
 637
 638static struct archiver zip_archiver = {
 639        "zip",
 640        write_zip_archive,
 641        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 642};
 643
 644void init_zip_archiver(void)
 645{
 646        register_archiver(&zip_archiver);
 647}