Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include "cache.h"
   5#include "config.h"
   6#include "archive.h"
   7#include "streaming.h"
   8#include "utf8.h"
   9#include "object-store.h"
  10#include "userdiff.h"
  11#include "xdiff-interface.h"
  12
  13static int zip_date;
  14static int zip_time;
  15
  16/* We only care about the "buf" part here. */
  17static struct strbuf zip_dir;
  18
  19static uintmax_t zip_offset;
  20static uint64_t zip_dir_entries;
  21
  22static unsigned int max_creator_version;
  23
  24#define ZIP_STREAM      (1 <<  3)
  25#define ZIP_UTF8        (1 << 11)
  26
  27struct zip_local_header {
  28        unsigned char magic[4];
  29        unsigned char version[2];
  30        unsigned char flags[2];
  31        unsigned char compression_method[2];
  32        unsigned char mtime[2];
  33        unsigned char mdate[2];
  34        unsigned char crc32[4];
  35        unsigned char compressed_size[4];
  36        unsigned char size[4];
  37        unsigned char filename_length[2];
  38        unsigned char extra_length[2];
  39        unsigned char _end[1];
  40};
  41
  42struct zip_data_desc {
  43        unsigned char magic[4];
  44        unsigned char crc32[4];
  45        unsigned char compressed_size[4];
  46        unsigned char size[4];
  47        unsigned char _end[1];
  48};
  49
  50struct zip64_data_desc {
  51        unsigned char magic[4];
  52        unsigned char crc32[4];
  53        unsigned char compressed_size[8];
  54        unsigned char size[8];
  55        unsigned char _end[1];
  56};
  57
  58struct zip_dir_trailer {
  59        unsigned char magic[4];
  60        unsigned char disk[2];
  61        unsigned char directory_start_disk[2];
  62        unsigned char entries_on_this_disk[2];
  63        unsigned char entries[2];
  64        unsigned char size[4];
  65        unsigned char offset[4];
  66        unsigned char comment_length[2];
  67        unsigned char _end[1];
  68};
  69
  70struct zip_extra_mtime {
  71        unsigned char magic[2];
  72        unsigned char extra_size[2];
  73        unsigned char flags[1];
  74        unsigned char mtime[4];
  75        unsigned char _end[1];
  76};
  77
  78struct zip64_extra {
  79        unsigned char magic[2];
  80        unsigned char extra_size[2];
  81        unsigned char size[8];
  82        unsigned char compressed_size[8];
  83        unsigned char _end[1];
  84};
  85
  86struct zip64_dir_trailer {
  87        unsigned char magic[4];
  88        unsigned char record_size[8];
  89        unsigned char creator_version[2];
  90        unsigned char version[2];
  91        unsigned char disk[4];
  92        unsigned char directory_start_disk[4];
  93        unsigned char entries_on_this_disk[8];
  94        unsigned char entries[8];
  95        unsigned char size[8];
  96        unsigned char offset[8];
  97        unsigned char _end[1];
  98};
  99
 100struct zip64_dir_trailer_locator {
 101        unsigned char magic[4];
 102        unsigned char disk[4];
 103        unsigned char offset[8];
 104        unsigned char number_of_disks[4];
 105        unsigned char _end[1];
 106};
 107
 108/*
 109 * On ARM, padding is added at the end of the struct, so a simple
 110 * sizeof(struct ...) reports two bytes more than the payload size
 111 * we're interested in.
 112 */
 113#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 114#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 115#define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 116#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 117#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 118#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 119#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 120        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 121#define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 122#define ZIP64_EXTRA_PAYLOAD_SIZE \
 123        (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 124#define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 125#define ZIP64_DIR_TRAILER_RECORD_SIZE \
 126        (ZIP64_DIR_TRAILER_SIZE - \
 127         offsetof(struct zip64_dir_trailer, creator_version))
 128#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 129        offsetof(struct zip64_dir_trailer_locator, _end)
 130
 131static void copy_le16(unsigned char *dest, unsigned int n)
 132{
 133        dest[0] = 0xff & n;
 134        dest[1] = 0xff & (n >> 010);
 135}
 136
 137static void copy_le32(unsigned char *dest, unsigned int n)
 138{
 139        dest[0] = 0xff & n;
 140        dest[1] = 0xff & (n >> 010);
 141        dest[2] = 0xff & (n >> 020);
 142        dest[3] = 0xff & (n >> 030);
 143}
 144
 145static void copy_le64(unsigned char *dest, uint64_t 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        dest[4] = 0xff & (n >> 040);
 152        dest[5] = 0xff & (n >> 050);
 153        dest[6] = 0xff & (n >> 060);
 154        dest[7] = 0xff & (n >> 070);
 155}
 156
 157static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 158{
 159        if (n <= max)
 160                return n;
 161        *clamped = 1;
 162        return max;
 163}
 164
 165static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 166{
 167        copy_le16(dest, clamp_max(n, 0xffff, clamped));
 168}
 169
 170static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 171{
 172        copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 173}
 174
 175static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 176{
 177        while (size-- > 0) {
 178                strbuf_addch(sb, n & 0xff);
 179                n >>= 8;
 180        }
 181        return -!!n;
 182}
 183
 184static uint32_t clamp32(uintmax_t n)
 185{
 186        const uintmax_t max = 0xffffffff;
 187        return (n < max) ? n : max;
 188}
 189
 190static void *zlib_deflate_raw(void *data, unsigned long size,
 191                              int compression_level,
 192                              unsigned long *compressed_size)
 193{
 194        git_zstream stream;
 195        unsigned long maxsize;
 196        void *buffer;
 197        int result;
 198
 199        git_deflate_init_raw(&stream, compression_level);
 200        maxsize = git_deflate_bound(&stream, size);
 201        buffer = xmalloc(maxsize);
 202
 203        stream.next_in = data;
 204        stream.avail_in = size;
 205        stream.next_out = buffer;
 206        stream.avail_out = maxsize;
 207
 208        do {
 209                result = git_deflate(&stream, Z_FINISH);
 210        } while (result == Z_OK);
 211
 212        if (result != Z_STREAM_END) {
 213                free(buffer);
 214                return NULL;
 215        }
 216
 217        git_deflate_end(&stream);
 218        *compressed_size = stream.total_out;
 219
 220        return buffer;
 221}
 222
 223static void write_zip_data_desc(unsigned long size,
 224                                unsigned long compressed_size,
 225                                unsigned long crc)
 226{
 227        if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 228                struct zip64_data_desc trailer;
 229                copy_le32(trailer.magic, 0x08074b50);
 230                copy_le32(trailer.crc32, crc);
 231                copy_le64(trailer.compressed_size, compressed_size);
 232                copy_le64(trailer.size, size);
 233                write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 234                zip_offset += ZIP64_DATA_DESC_SIZE;
 235        } else {
 236                struct zip_data_desc trailer;
 237                copy_le32(trailer.magic, 0x08074b50);
 238                copy_le32(trailer.crc32, crc);
 239                copy_le32(trailer.compressed_size, compressed_size);
 240                copy_le32(trailer.size, size);
 241                write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 242                zip_offset += ZIP_DATA_DESC_SIZE;
 243        }
 244}
 245
 246static void set_zip_header_data_desc(struct zip_local_header *header,
 247                                     unsigned long size,
 248                                     unsigned long compressed_size,
 249                                     unsigned long crc)
 250{
 251        copy_le32(header->crc32, crc);
 252        copy_le32(header->compressed_size, compressed_size);
 253        copy_le32(header->size, size);
 254}
 255
 256static int has_only_ascii(const char *s)
 257{
 258        for (;;) {
 259                int c = *s++;
 260                if (c == '\0')
 261                        return 1;
 262                if (!isascii(c))
 263                        return 0;
 264        }
 265}
 266
 267static int entry_is_binary(const char *path, const void *buffer, size_t size)
 268{
 269        struct userdiff_driver *driver = userdiff_find_by_path(path);
 270        if (!driver)
 271                driver = userdiff_find_by_name("default");
 272        if (driver->binary != -1)
 273                return driver->binary;
 274        return buffer_is_binary(buffer, size);
 275}
 276
 277#define STREAM_BUFFER_SIZE (1024 * 16)
 278
 279static int write_zip_entry(struct archiver_args *args,
 280                           const struct object_id *oid,
 281                           const char *path, size_t pathlen,
 282                           unsigned int mode)
 283{
 284        struct zip_local_header header;
 285        uintmax_t offset = zip_offset;
 286        struct zip_extra_mtime extra;
 287        struct zip64_extra extra64;
 288        size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 289        int need_zip64_extra = 0;
 290        unsigned long attr2;
 291        unsigned long compressed_size;
 292        unsigned long crc;
 293        int method;
 294        unsigned char *out;
 295        void *deflated = NULL;
 296        void *buffer;
 297        struct git_istream *stream = NULL;
 298        unsigned long flags = 0;
 299        unsigned long size;
 300        int is_binary = -1;
 301        const char *path_without_prefix = path + args->baselen;
 302        unsigned int creator_version = 0;
 303        unsigned int version_needed = 10;
 304        size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 305        size_t zip64_dir_extra_payload_size = 0;
 306
 307        crc = crc32(0, NULL, 0);
 308
 309        if (!has_only_ascii(path)) {
 310                if (is_utf8(path))
 311                        flags |= ZIP_UTF8;
 312                else
 313                        warning(_("path is not valid UTF-8: %s"), path);
 314        }
 315
 316        if (pathlen > 0xffff) {
 317                return error(_("path too long (%d chars, SHA1: %s): %s"),
 318                                (int)pathlen, oid_to_hex(oid), path);
 319        }
 320
 321        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 322                method = 0;
 323                attr2 = 16;
 324                out = NULL;
 325                size = 0;
 326                compressed_size = 0;
 327                buffer = NULL;
 328        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 329                enum object_type type = oid_object_info(args->repo, oid,
 330                                                        &size);
 331
 332                method = 0;
 333                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 334                        (mode & 0111) ? ((mode) << 16) : 0;
 335                if (S_ISLNK(mode) || (mode & 0111))
 336                        creator_version = 0x0317;
 337                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 338                        method = 8;
 339
 340                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 341                    size > big_file_threshold) {
 342                        stream = open_istream(oid, &type, &size, NULL);
 343                        if (!stream)
 344                                return error(_("cannot stream blob %s"),
 345                                             oid_to_hex(oid));
 346                        flags |= ZIP_STREAM;
 347                        out = buffer = NULL;
 348                } else {
 349                        buffer = object_file_to_archive(args, path, oid, mode,
 350                                                        &type, &size);
 351                        if (!buffer)
 352                                return error(_("cannot read %s"),
 353                                             oid_to_hex(oid));
 354                        crc = crc32(crc, buffer, size);
 355                        is_binary = entry_is_binary(path_without_prefix,
 356                                                    buffer, size);
 357                        out = buffer;
 358                }
 359                compressed_size = (method == 0) ? 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 == 8) {
 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 = 0;
 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 == 0) {
 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(path_without_prefix,
 432                                                            buf, readlen);
 433                        write_or_die(1, buf, readlen);
 434                }
 435                close_istream(stream);
 436                if (readlen)
 437                        return readlen;
 438
 439                compressed_size = size;
 440                zip_offset += compressed_size;
 441
 442                write_zip_data_desc(size, compressed_size, crc);
 443        } else if (stream && method == 8) {
 444                unsigned char buf[STREAM_BUFFER_SIZE];
 445                ssize_t readlen;
 446                git_zstream zstream;
 447                int result;
 448                size_t out_len;
 449                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 450
 451                git_deflate_init_raw(&zstream, args->compression_level);
 452
 453                compressed_size = 0;
 454                zstream.next_out = compressed;
 455                zstream.avail_out = sizeof(compressed);
 456
 457                for (;;) {
 458                        readlen = read_istream(stream, buf, sizeof(buf));
 459                        if (readlen <= 0)
 460                                break;
 461                        crc = crc32(crc, buf, readlen);
 462                        if (is_binary == -1)
 463                                is_binary = entry_is_binary(path_without_prefix,
 464                                                            buf, readlen);
 465
 466                        zstream.next_in = buf;
 467                        zstream.avail_in = readlen;
 468                        result = git_deflate(&zstream, 0);
 469                        if (result != Z_OK)
 470                                die(_("deflate error (%d)"), result);
 471                        out_len = zstream.next_out - compressed;
 472
 473                        if (out_len > 0) {
 474                                write_or_die(1, compressed, out_len);
 475                                compressed_size += out_len;
 476                                zstream.next_out = compressed;
 477                                zstream.avail_out = sizeof(compressed);
 478                        }
 479
 480                }
 481                close_istream(stream);
 482                if (readlen)
 483                        return readlen;
 484
 485                zstream.next_in = buf;
 486                zstream.avail_in = 0;
 487                result = git_deflate(&zstream, Z_FINISH);
 488                if (result != Z_STREAM_END)
 489                        die("deflate error (%d)", result);
 490
 491                git_deflate_end(&zstream);
 492                out_len = zstream.next_out - compressed;
 493                write_or_die(1, compressed, out_len);
 494                compressed_size += out_len;
 495                zip_offset += compressed_size;
 496
 497                write_zip_data_desc(size, compressed_size, crc);
 498        } else if (compressed_size > 0) {
 499                write_or_die(1, out, compressed_size);
 500                zip_offset += compressed_size;
 501        }
 502
 503        free(deflated);
 504        free(buffer);
 505
 506        if (compressed_size > 0xffffffff || size > 0xffffffff ||
 507            offset > 0xffffffff) {
 508                if (compressed_size >= 0xffffffff)
 509                        zip64_dir_extra_payload_size += 8;
 510                if (size >= 0xffffffff)
 511                        zip64_dir_extra_payload_size += 8;
 512                if (offset >= 0xffffffff)
 513                        zip64_dir_extra_payload_size += 8;
 514                zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 515        }
 516
 517        strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 518        strbuf_add_le(&zip_dir, 2, creator_version);
 519        strbuf_add_le(&zip_dir, 2, version_needed);
 520        strbuf_add_le(&zip_dir, 2, flags);
 521        strbuf_add_le(&zip_dir, 2, method);
 522        strbuf_add_le(&zip_dir, 2, zip_time);
 523        strbuf_add_le(&zip_dir, 2, zip_date);
 524        strbuf_add_le(&zip_dir, 4, crc);
 525        strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 526        strbuf_add_le(&zip_dir, 4, clamp32(size));
 527        strbuf_add_le(&zip_dir, 2, pathlen);
 528        strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 529        strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 530        strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 531        strbuf_add_le(&zip_dir, 2, !is_binary);
 532        strbuf_add_le(&zip_dir, 4, attr2);
 533        strbuf_add_le(&zip_dir, 4, clamp32(offset));
 534        strbuf_add(&zip_dir, path, pathlen);
 535        strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 536        if (zip64_dir_extra_payload_size) {
 537                strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 538                strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 539                if (size >= 0xffffffff)
 540                        strbuf_add_le(&zip_dir, 8, size);
 541                if (compressed_size >= 0xffffffff)
 542                        strbuf_add_le(&zip_dir, 8, compressed_size);
 543                if (offset >= 0xffffffff)
 544                        strbuf_add_le(&zip_dir, 8, offset);
 545        }
 546        zip_dir_entries++;
 547
 548        return 0;
 549}
 550
 551static void write_zip64_trailer(void)
 552{
 553        struct zip64_dir_trailer trailer64;
 554        struct zip64_dir_trailer_locator locator64;
 555
 556        copy_le32(trailer64.magic, 0x06064b50);
 557        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 558        copy_le16(trailer64.creator_version, max_creator_version);
 559        copy_le16(trailer64.version, 45);
 560        copy_le32(trailer64.disk, 0);
 561        copy_le32(trailer64.directory_start_disk, 0);
 562        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 563        copy_le64(trailer64.entries, zip_dir_entries);
 564        copy_le64(trailer64.size, zip_dir.len);
 565        copy_le64(trailer64.offset, zip_offset);
 566
 567        copy_le32(locator64.magic, 0x07064b50);
 568        copy_le32(locator64.disk, 0);
 569        copy_le64(locator64.offset, zip_offset + zip_dir.len);
 570        copy_le32(locator64.number_of_disks, 1);
 571
 572        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 573        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 574}
 575
 576static void write_zip_trailer(const unsigned char *sha1)
 577{
 578        struct zip_dir_trailer trailer;
 579        int clamped = 0;
 580
 581        copy_le32(trailer.magic, 0x06054b50);
 582        copy_le16(trailer.disk, 0);
 583        copy_le16(trailer.directory_start_disk, 0);
 584        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 585                        &clamped);
 586        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 587        copy_le32(trailer.size, zip_dir.len);
 588        copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 589        copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 590
 591        write_or_die(1, zip_dir.buf, zip_dir.len);
 592        if (clamped)
 593                write_zip64_trailer();
 594        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 595        if (sha1)
 596                write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 597}
 598
 599static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 600{
 601        time_t time;
 602        struct tm *t;
 603
 604        if (date_overflows(*timestamp))
 605                die(_("timestamp too large for this system: %"PRItime),
 606                    *timestamp);
 607        time = (time_t)*timestamp;
 608        t = localtime(&time);
 609        *timestamp = time;
 610
 611        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 612                    (t->tm_year + 1900 - 1980) * 512;
 613        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 614}
 615
 616static int archive_zip_config(const char *var, const char *value, void *data)
 617{
 618        return userdiff_config(var, value);
 619}
 620
 621static int write_zip_archive(const struct archiver *ar,
 622                             struct archiver_args *args)
 623{
 624        int err;
 625
 626        git_config(archive_zip_config, NULL);
 627
 628        dos_time(&args->time, &zip_date, &zip_time);
 629
 630        strbuf_init(&zip_dir, 0);
 631
 632        err = write_archive_entries(args, write_zip_entry);
 633        if (!err)
 634                write_zip_trailer(args->commit_sha1);
 635
 636        strbuf_release(&zip_dir);
 637
 638        return err;
 639}
 640
 641static struct archiver zip_archiver = {
 642        "zip",
 643        write_zip_archive,
 644        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 645};
 646
 647void init_zip_archiver(void)
 648{
 649        register_archiver(&zip_archiver);
 650}