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 "userdiff.h"
  10#include "xdiff-interface.h"
  11
  12static int zip_date;
  13static int zip_time;
  14
  15/* We only care about the "buf" part here. */
  16static struct strbuf zip_dir;
  17
  18static uintmax_t zip_offset;
  19static uint64_t zip_dir_entries;
  20
  21static unsigned int max_creator_version;
  22
  23#define ZIP_STREAM      (1 <<  3)
  24#define ZIP_UTF8        (1 << 11)
  25
  26struct zip_local_header {
  27        unsigned char magic[4];
  28        unsigned char version[2];
  29        unsigned char flags[2];
  30        unsigned char compression_method[2];
  31        unsigned char mtime[2];
  32        unsigned char mdate[2];
  33        unsigned char crc32[4];
  34        unsigned char compressed_size[4];
  35        unsigned char size[4];
  36        unsigned char filename_length[2];
  37        unsigned char extra_length[2];
  38        unsigned char _end[1];
  39};
  40
  41struct zip_data_desc {
  42        unsigned char magic[4];
  43        unsigned char crc32[4];
  44        unsigned char compressed_size[4];
  45        unsigned char size[4];
  46        unsigned char _end[1];
  47};
  48
  49struct zip64_data_desc {
  50        unsigned char magic[4];
  51        unsigned char crc32[4];
  52        unsigned char compressed_size[8];
  53        unsigned char size[8];
  54        unsigned char _end[1];
  55};
  56
  57struct zip_dir_trailer {
  58        unsigned char magic[4];
  59        unsigned char disk[2];
  60        unsigned char directory_start_disk[2];
  61        unsigned char entries_on_this_disk[2];
  62        unsigned char entries[2];
  63        unsigned char size[4];
  64        unsigned char offset[4];
  65        unsigned char comment_length[2];
  66        unsigned char _end[1];
  67};
  68
  69struct zip_extra_mtime {
  70        unsigned char magic[2];
  71        unsigned char extra_size[2];
  72        unsigned char flags[1];
  73        unsigned char mtime[4];
  74        unsigned char _end[1];
  75};
  76
  77struct zip64_extra {
  78        unsigned char magic[2];
  79        unsigned char extra_size[2];
  80        unsigned char size[8];
  81        unsigned char compressed_size[8];
  82        unsigned char _end[1];
  83};
  84
  85struct zip64_dir_trailer {
  86        unsigned char magic[4];
  87        unsigned char record_size[8];
  88        unsigned char creator_version[2];
  89        unsigned char version[2];
  90        unsigned char disk[4];
  91        unsigned char directory_start_disk[4];
  92        unsigned char entries_on_this_disk[8];
  93        unsigned char entries[8];
  94        unsigned char size[8];
  95        unsigned char offset[8];
  96        unsigned char _end[1];
  97};
  98
  99struct zip64_dir_trailer_locator {
 100        unsigned char magic[4];
 101        unsigned char disk[4];
 102        unsigned char offset[8];
 103        unsigned char number_of_disks[4];
 104        unsigned char _end[1];
 105};
 106
 107/*
 108 * On ARM, padding is added at the end of the struct, so a simple
 109 * sizeof(struct ...) reports two bytes more than the payload size
 110 * we're interested in.
 111 */
 112#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 113#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 114#define ZIP64_DATA_DESC_SIZE    offsetof(struct zip64_data_desc, _end)
 115#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 116#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 117#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 118#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 119        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 120#define ZIP64_EXTRA_SIZE        offsetof(struct zip64_extra, _end)
 121#define ZIP64_EXTRA_PAYLOAD_SIZE \
 122        (ZIP64_EXTRA_SIZE - offsetof(struct zip64_extra, size))
 123#define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 124#define ZIP64_DIR_TRAILER_RECORD_SIZE \
 125        (ZIP64_DIR_TRAILER_SIZE - \
 126         offsetof(struct zip64_dir_trailer, creator_version))
 127#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 128        offsetof(struct zip64_dir_trailer_locator, _end)
 129
 130static void copy_le16(unsigned char *dest, unsigned int n)
 131{
 132        dest[0] = 0xff & n;
 133        dest[1] = 0xff & (n >> 010);
 134}
 135
 136static void copy_le32(unsigned char *dest, unsigned int n)
 137{
 138        dest[0] = 0xff & n;
 139        dest[1] = 0xff & (n >> 010);
 140        dest[2] = 0xff & (n >> 020);
 141        dest[3] = 0xff & (n >> 030);
 142}
 143
 144static void copy_le64(unsigned char *dest, uint64_t n)
 145{
 146        dest[0] = 0xff & n;
 147        dest[1] = 0xff & (n >> 010);
 148        dest[2] = 0xff & (n >> 020);
 149        dest[3] = 0xff & (n >> 030);
 150        dest[4] = 0xff & (n >> 040);
 151        dest[5] = 0xff & (n >> 050);
 152        dest[6] = 0xff & (n >> 060);
 153        dest[7] = 0xff & (n >> 070);
 154}
 155
 156static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 157{
 158        if (n <= max)
 159                return n;
 160        *clamped = 1;
 161        return max;
 162}
 163
 164static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 165{
 166        copy_le16(dest, clamp_max(n, 0xffff, clamped));
 167}
 168
 169static void copy_le32_clamp(unsigned char *dest, uint64_t n, int *clamped)
 170{
 171        copy_le32(dest, clamp_max(n, 0xffffffff, clamped));
 172}
 173
 174static int strbuf_add_le(struct strbuf *sb, size_t size, uintmax_t n)
 175{
 176        while (size-- > 0) {
 177                strbuf_addch(sb, n & 0xff);
 178                n >>= 8;
 179        }
 180        return -!!n;
 181}
 182
 183static uint32_t clamp32(uintmax_t n)
 184{
 185        const uintmax_t max = 0xffffffff;
 186        return (n < max) ? n : max;
 187}
 188
 189static void *zlib_deflate_raw(void *data, unsigned long size,
 190                              int compression_level,
 191                              unsigned long *compressed_size)
 192{
 193        git_zstream stream;
 194        unsigned long maxsize;
 195        void *buffer;
 196        int result;
 197
 198        git_deflate_init_raw(&stream, compression_level);
 199        maxsize = git_deflate_bound(&stream, size);
 200        buffer = xmalloc(maxsize);
 201
 202        stream.next_in = data;
 203        stream.avail_in = size;
 204        stream.next_out = buffer;
 205        stream.avail_out = maxsize;
 206
 207        do {
 208                result = git_deflate(&stream, Z_FINISH);
 209        } while (result == Z_OK);
 210
 211        if (result != Z_STREAM_END) {
 212                free(buffer);
 213                return NULL;
 214        }
 215
 216        git_deflate_end(&stream);
 217        *compressed_size = stream.total_out;
 218
 219        return buffer;
 220}
 221
 222static void write_zip_data_desc(unsigned long size,
 223                                unsigned long compressed_size,
 224                                unsigned long crc)
 225{
 226        if (size >= 0xffffffff || compressed_size >= 0xffffffff) {
 227                struct zip64_data_desc trailer;
 228                copy_le32(trailer.magic, 0x08074b50);
 229                copy_le32(trailer.crc32, crc);
 230                copy_le64(trailer.compressed_size, compressed_size);
 231                copy_le64(trailer.size, size);
 232                write_or_die(1, &trailer, ZIP64_DATA_DESC_SIZE);
 233                zip_offset += ZIP64_DATA_DESC_SIZE;
 234        } else {
 235                struct zip_data_desc trailer;
 236                copy_le32(trailer.magic, 0x08074b50);
 237                copy_le32(trailer.crc32, crc);
 238                copy_le32(trailer.compressed_size, compressed_size);
 239                copy_le32(trailer.size, size);
 240                write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 241                zip_offset += ZIP_DATA_DESC_SIZE;
 242        }
 243}
 244
 245static void set_zip_header_data_desc(struct zip_local_header *header,
 246                                     unsigned long size,
 247                                     unsigned long compressed_size,
 248                                     unsigned long crc)
 249{
 250        copy_le32(header->crc32, crc);
 251        copy_le32(header->compressed_size, compressed_size);
 252        copy_le32(header->size, size);
 253}
 254
 255static int has_only_ascii(const char *s)
 256{
 257        for (;;) {
 258                int c = *s++;
 259                if (c == '\0')
 260                        return 1;
 261                if (!isascii(c))
 262                        return 0;
 263        }
 264}
 265
 266static int entry_is_binary(const char *path, const void *buffer, size_t size)
 267{
 268        struct userdiff_driver *driver = userdiff_find_by_path(path);
 269        if (!driver)
 270                driver = userdiff_find_by_name("default");
 271        if (driver->binary != -1)
 272                return driver->binary;
 273        return buffer_is_binary(buffer, size);
 274}
 275
 276#define STREAM_BUFFER_SIZE (1024 * 16)
 277
 278static int write_zip_entry(struct archiver_args *args,
 279                           const unsigned char *sha1,
 280                           const char *path, size_t pathlen,
 281                           unsigned int mode)
 282{
 283        struct zip_local_header header;
 284        uintmax_t offset = zip_offset;
 285        struct zip_extra_mtime extra;
 286        struct zip64_extra extra64;
 287        size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 288        int need_zip64_extra = 0;
 289        unsigned long attr2;
 290        unsigned long compressed_size;
 291        unsigned long crc;
 292        int method;
 293        unsigned char *out;
 294        void *deflated = NULL;
 295        void *buffer;
 296        struct git_istream *stream = NULL;
 297        unsigned long flags = 0;
 298        unsigned long size;
 299        int is_binary = -1;
 300        const char *path_without_prefix = path + args->baselen;
 301        unsigned int creator_version = 0;
 302        unsigned int version_needed = 10;
 303        size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 304        size_t zip64_dir_extra_payload_size = 0;
 305
 306        crc = crc32(0, NULL, 0);
 307
 308        if (!has_only_ascii(path)) {
 309                if (is_utf8(path))
 310                        flags |= ZIP_UTF8;
 311                else
 312                        warning("Path is not valid UTF-8: %s", path);
 313        }
 314
 315        if (pathlen > 0xffff) {
 316                return error("path too long (%d chars, SHA1: %s): %s",
 317                                (int)pathlen, sha1_to_hex(sha1), path);
 318        }
 319
 320        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 321                method = 0;
 322                attr2 = 16;
 323                out = NULL;
 324                size = 0;
 325                compressed_size = 0;
 326                buffer = NULL;
 327        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 328                enum object_type type = sha1_object_info(sha1, &size);
 329
 330                method = 0;
 331                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 332                        (mode & 0111) ? ((mode) << 16) : 0;
 333                if (S_ISLNK(mode) || (mode & 0111))
 334                        creator_version = 0x0317;
 335                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 336                        method = 8;
 337
 338                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 339                    size > big_file_threshold) {
 340                        stream = open_istream(sha1, &type, &size, NULL);
 341                        if (!stream)
 342                                return error("cannot stream blob %s",
 343                                             sha1_to_hex(sha1));
 344                        flags |= ZIP_STREAM;
 345                        out = buffer = NULL;
 346                } else {
 347                        buffer = sha1_file_to_archive(args, path, sha1, mode,
 348                                                      &type, &size);
 349                        if (!buffer)
 350                                return error("cannot read %s",
 351                                             sha1_to_hex(sha1));
 352                        crc = crc32(crc, buffer, size);
 353                        is_binary = entry_is_binary(path_without_prefix,
 354                                                    buffer, size);
 355                        out = buffer;
 356                }
 357                compressed_size = (method == 0) ? size : 0;
 358        } else {
 359                return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 360                                sha1_to_hex(sha1));
 361        }
 362
 363        if (creator_version > max_creator_version)
 364                max_creator_version = creator_version;
 365
 366        if (buffer && method == 8) {
 367                out = deflated = zlib_deflate_raw(buffer, size,
 368                                                  args->compression_level,
 369                                                  &compressed_size);
 370                if (!out || compressed_size >= size) {
 371                        out = buffer;
 372                        method = 0;
 373                        compressed_size = size;
 374                }
 375        }
 376
 377        copy_le16(extra.magic, 0x5455);
 378        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 379        extra.flags[0] = 1;     /* just mtime */
 380        copy_le32(extra.mtime, args->time);
 381
 382        if (size > 0xffffffff || compressed_size > 0xffffffff)
 383                need_zip64_extra = 1;
 384        if (stream && size > 0x7fffffff)
 385                need_zip64_extra = 1;
 386
 387        if (need_zip64_extra)
 388                version_needed = 45;
 389
 390        copy_le32(header.magic, 0x04034b50);
 391        copy_le16(header.version, version_needed);
 392        copy_le16(header.flags, flags);
 393        copy_le16(header.compression_method, method);
 394        copy_le16(header.mtime, zip_time);
 395        copy_le16(header.mdate, zip_date);
 396        if (need_zip64_extra) {
 397                set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 398                header_extra_size += ZIP64_EXTRA_SIZE;
 399        } else {
 400                set_zip_header_data_desc(&header, size, compressed_size, crc);
 401        }
 402        copy_le16(header.filename_length, pathlen);
 403        copy_le16(header.extra_length, header_extra_size);
 404        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 405        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 406        write_or_die(1, path, pathlen);
 407        zip_offset += pathlen;
 408        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 409        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 410        if (need_zip64_extra) {
 411                copy_le16(extra64.magic, 0x0001);
 412                copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 413                copy_le64(extra64.size, size);
 414                copy_le64(extra64.compressed_size, compressed_size);
 415                write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 416                zip_offset += ZIP64_EXTRA_SIZE;
 417        }
 418
 419        if (stream && method == 0) {
 420                unsigned char buf[STREAM_BUFFER_SIZE];
 421                ssize_t readlen;
 422
 423                for (;;) {
 424                        readlen = read_istream(stream, buf, sizeof(buf));
 425                        if (readlen <= 0)
 426                                break;
 427                        crc = crc32(crc, buf, readlen);
 428                        if (is_binary == -1)
 429                                is_binary = entry_is_binary(path_without_prefix,
 430                                                            buf, readlen);
 431                        write_or_die(1, buf, readlen);
 432                }
 433                close_istream(stream);
 434                if (readlen)
 435                        return readlen;
 436
 437                compressed_size = size;
 438                zip_offset += compressed_size;
 439
 440                write_zip_data_desc(size, compressed_size, crc);
 441        } else if (stream && method == 8) {
 442                unsigned char buf[STREAM_BUFFER_SIZE];
 443                ssize_t readlen;
 444                git_zstream zstream;
 445                int result;
 446                size_t out_len;
 447                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 448
 449                git_deflate_init_raw(&zstream, args->compression_level);
 450
 451                compressed_size = 0;
 452                zstream.next_out = compressed;
 453                zstream.avail_out = sizeof(compressed);
 454
 455                for (;;) {
 456                        readlen = read_istream(stream, buf, sizeof(buf));
 457                        if (readlen <= 0)
 458                                break;
 459                        crc = crc32(crc, buf, readlen);
 460                        if (is_binary == -1)
 461                                is_binary = entry_is_binary(path_without_prefix,
 462                                                            buf, readlen);
 463
 464                        zstream.next_in = buf;
 465                        zstream.avail_in = readlen;
 466                        result = git_deflate(&zstream, 0);
 467                        if (result != Z_OK)
 468                                die("deflate error (%d)", result);
 469                        out_len = zstream.next_out - compressed;
 470
 471                        if (out_len > 0) {
 472                                write_or_die(1, compressed, out_len);
 473                                compressed_size += out_len;
 474                                zstream.next_out = compressed;
 475                                zstream.avail_out = sizeof(compressed);
 476                        }
 477
 478                }
 479                close_istream(stream);
 480                if (readlen)
 481                        return readlen;
 482
 483                zstream.next_in = buf;
 484                zstream.avail_in = 0;
 485                result = git_deflate(&zstream, Z_FINISH);
 486                if (result != Z_STREAM_END)
 487                        die("deflate error (%d)", result);
 488
 489                git_deflate_end(&zstream);
 490                out_len = zstream.next_out - compressed;
 491                write_or_die(1, compressed, out_len);
 492                compressed_size += out_len;
 493                zip_offset += compressed_size;
 494
 495                write_zip_data_desc(size, compressed_size, crc);
 496        } else if (compressed_size > 0) {
 497                write_or_die(1, out, compressed_size);
 498                zip_offset += compressed_size;
 499        }
 500
 501        free(deflated);
 502        free(buffer);
 503
 504        if (compressed_size > 0xffffffff || size > 0xffffffff ||
 505            offset > 0xffffffff) {
 506                if (compressed_size >= 0xffffffff)
 507                        zip64_dir_extra_payload_size += 8;
 508                if (size >= 0xffffffff)
 509                        zip64_dir_extra_payload_size += 8;
 510                if (offset >= 0xffffffff)
 511                        zip64_dir_extra_payload_size += 8;
 512                zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 513        }
 514
 515        strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 516        strbuf_add_le(&zip_dir, 2, creator_version);
 517        strbuf_add_le(&zip_dir, 2, version_needed);
 518        strbuf_add_le(&zip_dir, 2, flags);
 519        strbuf_add_le(&zip_dir, 2, method);
 520        strbuf_add_le(&zip_dir, 2, zip_time);
 521        strbuf_add_le(&zip_dir, 2, zip_date);
 522        strbuf_add_le(&zip_dir, 4, crc);
 523        strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 524        strbuf_add_le(&zip_dir, 4, clamp32(size));
 525        strbuf_add_le(&zip_dir, 2, pathlen);
 526        strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 527        strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 528        strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 529        strbuf_add_le(&zip_dir, 2, !is_binary);
 530        strbuf_add_le(&zip_dir, 4, attr2);
 531        strbuf_add_le(&zip_dir, 4, clamp32(offset));
 532        strbuf_add(&zip_dir, path, pathlen);
 533        strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 534        if (zip64_dir_extra_payload_size) {
 535                strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 536                strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 537                if (size >= 0xffffffff)
 538                        strbuf_add_le(&zip_dir, 8, size);
 539                if (compressed_size >= 0xffffffff)
 540                        strbuf_add_le(&zip_dir, 8, compressed_size);
 541                if (offset >= 0xffffffff)
 542                        strbuf_add_le(&zip_dir, 8, offset);
 543        }
 544        zip_dir_entries++;
 545
 546        return 0;
 547}
 548
 549static void write_zip64_trailer(void)
 550{
 551        struct zip64_dir_trailer trailer64;
 552        struct zip64_dir_trailer_locator locator64;
 553
 554        copy_le32(trailer64.magic, 0x06064b50);
 555        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 556        copy_le16(trailer64.creator_version, max_creator_version);
 557        copy_le16(trailer64.version, 45);
 558        copy_le32(trailer64.disk, 0);
 559        copy_le32(trailer64.directory_start_disk, 0);
 560        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 561        copy_le64(trailer64.entries, zip_dir_entries);
 562        copy_le64(trailer64.size, zip_dir.len);
 563        copy_le64(trailer64.offset, zip_offset);
 564
 565        copy_le32(locator64.magic, 0x07064b50);
 566        copy_le32(locator64.disk, 0);
 567        copy_le64(locator64.offset, zip_offset + zip_dir.len);
 568        copy_le32(locator64.number_of_disks, 1);
 569
 570        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 571        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 572}
 573
 574static void write_zip_trailer(const unsigned char *sha1)
 575{
 576        struct zip_dir_trailer trailer;
 577        int clamped = 0;
 578
 579        copy_le32(trailer.magic, 0x06054b50);
 580        copy_le16(trailer.disk, 0);
 581        copy_le16(trailer.directory_start_disk, 0);
 582        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 583                        &clamped);
 584        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 585        copy_le32(trailer.size, zip_dir.len);
 586        copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 587        copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 588
 589        write_or_die(1, zip_dir.buf, zip_dir.len);
 590        if (clamped)
 591                write_zip64_trailer();
 592        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 593        if (sha1)
 594                write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 595}
 596
 597static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 598{
 599        time_t time;
 600        struct tm *t;
 601
 602        if (date_overflows(*timestamp))
 603                die("timestamp too large for this system: %"PRItime,
 604                    *timestamp);
 605        time = (time_t)*timestamp;
 606        t = localtime(&time);
 607        *timestamp = time;
 608
 609        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 610                    (t->tm_year + 1900 - 1980) * 512;
 611        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 612}
 613
 614static int archive_zip_config(const char *var, const char *value, void *data)
 615{
 616        return userdiff_config(var, value);
 617}
 618
 619static int write_zip_archive(const struct archiver *ar,
 620                             struct archiver_args *args)
 621{
 622        int err;
 623
 624        git_config(archive_zip_config, NULL);
 625
 626        dos_time(&args->time, &zip_date, &zip_time);
 627
 628        strbuf_init(&zip_dir, 0);
 629
 630        err = write_archive_entries(args, write_zip_entry);
 631        if (!err)
 632                write_zip_trailer(args->commit_sha1);
 633
 634        strbuf_release(&zip_dir);
 635
 636        return err;
 637}
 638
 639static struct archiver zip_archiver = {
 640        "zip",
 641        write_zip_archive,
 642        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 643};
 644
 645void init_zip_archiver(void)
 646{
 647        register_archiver(&zip_archiver);
 648}