Andrew's git / gitweb.git / archive-zip.c
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archive-zip.con commit Merge branch 'rs/get-tagged-oid' (cf861cd)
   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(struct index_state *istate, const char *path,
 268                           const void *buffer, size_t size)
 269{
 270        struct userdiff_driver *driver = userdiff_find_by_path(istate, path);
 271        if (!driver)
 272                driver = userdiff_find_by_name("default");
 273        if (driver->binary != -1)
 274                return driver->binary;
 275        return buffer_is_binary(buffer, size);
 276}
 277
 278#define STREAM_BUFFER_SIZE (1024 * 16)
 279
 280static int write_zip_entry(struct archiver_args *args,
 281                           const struct object_id *oid,
 282                           const char *path, size_t pathlen,
 283                           unsigned int mode)
 284{
 285        struct zip_local_header header;
 286        uintmax_t offset = zip_offset;
 287        struct zip_extra_mtime extra;
 288        struct zip64_extra extra64;
 289        size_t header_extra_size = ZIP_EXTRA_MTIME_SIZE;
 290        int need_zip64_extra = 0;
 291        unsigned long attr2;
 292        unsigned long compressed_size;
 293        unsigned long crc;
 294        int method;
 295        unsigned char *out;
 296        void *deflated = NULL;
 297        void *buffer;
 298        struct git_istream *stream = NULL;
 299        unsigned long flags = 0;
 300        unsigned long size;
 301        int is_binary = -1;
 302        const char *path_without_prefix = path + args->baselen;
 303        unsigned int creator_version = 0;
 304        unsigned int version_needed = 10;
 305        size_t zip_dir_extra_size = ZIP_EXTRA_MTIME_SIZE;
 306        size_t zip64_dir_extra_payload_size = 0;
 307
 308        crc = crc32(0, NULL, 0);
 309
 310        if (!has_only_ascii(path)) {
 311                if (is_utf8(path))
 312                        flags |= ZIP_UTF8;
 313                else
 314                        warning(_("path is not valid UTF-8: %s"), path);
 315        }
 316
 317        if (pathlen > 0xffff) {
 318                return error(_("path too long (%d chars, SHA1: %s): %s"),
 319                                (int)pathlen, oid_to_hex(oid), path);
 320        }
 321
 322        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 323                method = 0;
 324                attr2 = 16;
 325                out = NULL;
 326                size = 0;
 327                compressed_size = 0;
 328                buffer = NULL;
 329        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 330                enum object_type type = oid_object_info(args->repo, oid,
 331                                                        &size);
 332
 333                method = 0;
 334                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 335                        (mode & 0111) ? ((mode) << 16) : 0;
 336                if (S_ISLNK(mode) || (mode & 0111))
 337                        creator_version = 0x0317;
 338                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 339                        method = 8;
 340
 341                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 342                    size > big_file_threshold) {
 343                        stream = open_istream(oid, &type, &size, NULL);
 344                        if (!stream)
 345                                return error(_("cannot stream blob %s"),
 346                                             oid_to_hex(oid));
 347                        flags |= ZIP_STREAM;
 348                        out = buffer = NULL;
 349                } else {
 350                        buffer = object_file_to_archive(args, path, oid, mode,
 351                                                        &type, &size);
 352                        if (!buffer)
 353                                return error(_("cannot read %s"),
 354                                             oid_to_hex(oid));
 355                        crc = crc32(crc, buffer, size);
 356                        is_binary = entry_is_binary(args->repo->index,
 357                                                    path_without_prefix,
 358                                                    buffer, size);
 359                        out = buffer;
 360                }
 361                compressed_size = (method == 0) ? size : 0;
 362        } else {
 363                return error(_("unsupported file mode: 0%o (SHA1: %s)"), mode,
 364                                oid_to_hex(oid));
 365        }
 366
 367        if (creator_version > max_creator_version)
 368                max_creator_version = creator_version;
 369
 370        if (buffer && method == 8) {
 371                out = deflated = zlib_deflate_raw(buffer, size,
 372                                                  args->compression_level,
 373                                                  &compressed_size);
 374                if (!out || compressed_size >= size) {
 375                        out = buffer;
 376                        method = 0;
 377                        compressed_size = size;
 378                }
 379        }
 380
 381        copy_le16(extra.magic, 0x5455);
 382        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 383        extra.flags[0] = 1;     /* just mtime */
 384        copy_le32(extra.mtime, args->time);
 385
 386        if (size > 0xffffffff || compressed_size > 0xffffffff)
 387                need_zip64_extra = 1;
 388        if (stream && size > 0x7fffffff)
 389                need_zip64_extra = 1;
 390
 391        if (need_zip64_extra)
 392                version_needed = 45;
 393
 394        copy_le32(header.magic, 0x04034b50);
 395        copy_le16(header.version, version_needed);
 396        copy_le16(header.flags, flags);
 397        copy_le16(header.compression_method, method);
 398        copy_le16(header.mtime, zip_time);
 399        copy_le16(header.mdate, zip_date);
 400        if (need_zip64_extra) {
 401                set_zip_header_data_desc(&header, 0xffffffff, 0xffffffff, crc);
 402                header_extra_size += ZIP64_EXTRA_SIZE;
 403        } else {
 404                set_zip_header_data_desc(&header, size, compressed_size, crc);
 405        }
 406        copy_le16(header.filename_length, pathlen);
 407        copy_le16(header.extra_length, header_extra_size);
 408        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 409        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 410        write_or_die(1, path, pathlen);
 411        zip_offset += pathlen;
 412        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 413        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 414        if (need_zip64_extra) {
 415                copy_le16(extra64.magic, 0x0001);
 416                copy_le16(extra64.extra_size, ZIP64_EXTRA_PAYLOAD_SIZE);
 417                copy_le64(extra64.size, size);
 418                copy_le64(extra64.compressed_size, compressed_size);
 419                write_or_die(1, &extra64, ZIP64_EXTRA_SIZE);
 420                zip_offset += ZIP64_EXTRA_SIZE;
 421        }
 422
 423        if (stream && method == 0) {
 424                unsigned char buf[STREAM_BUFFER_SIZE];
 425                ssize_t readlen;
 426
 427                for (;;) {
 428                        readlen = read_istream(stream, buf, sizeof(buf));
 429                        if (readlen <= 0)
 430                                break;
 431                        crc = crc32(crc, buf, readlen);
 432                        if (is_binary == -1)
 433                                is_binary = entry_is_binary(args->repo->index,
 434                                                            path_without_prefix,
 435                                                            buf, readlen);
 436                        write_or_die(1, buf, readlen);
 437                }
 438                close_istream(stream);
 439                if (readlen)
 440                        return readlen;
 441
 442                compressed_size = size;
 443                zip_offset += compressed_size;
 444
 445                write_zip_data_desc(size, compressed_size, crc);
 446        } else if (stream && method == 8) {
 447                unsigned char buf[STREAM_BUFFER_SIZE];
 448                ssize_t readlen;
 449                git_zstream zstream;
 450                int result;
 451                size_t out_len;
 452                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 453
 454                git_deflate_init_raw(&zstream, args->compression_level);
 455
 456                compressed_size = 0;
 457                zstream.next_out = compressed;
 458                zstream.avail_out = sizeof(compressed);
 459
 460                for (;;) {
 461                        readlen = read_istream(stream, buf, sizeof(buf));
 462                        if (readlen <= 0)
 463                                break;
 464                        crc = crc32(crc, buf, readlen);
 465                        if (is_binary == -1)
 466                                is_binary = entry_is_binary(args->repo->index,
 467                                                            path_without_prefix,
 468                                                            buf, readlen);
 469
 470                        zstream.next_in = buf;
 471                        zstream.avail_in = readlen;
 472                        result = git_deflate(&zstream, 0);
 473                        if (result != Z_OK)
 474                                die(_("deflate error (%d)"), result);
 475                        out_len = zstream.next_out - compressed;
 476
 477                        if (out_len > 0) {
 478                                write_or_die(1, compressed, out_len);
 479                                compressed_size += out_len;
 480                                zstream.next_out = compressed;
 481                                zstream.avail_out = sizeof(compressed);
 482                        }
 483
 484                }
 485                close_istream(stream);
 486                if (readlen)
 487                        return readlen;
 488
 489                zstream.next_in = buf;
 490                zstream.avail_in = 0;
 491                result = git_deflate(&zstream, Z_FINISH);
 492                if (result != Z_STREAM_END)
 493                        die("deflate error (%d)", result);
 494
 495                git_deflate_end(&zstream);
 496                out_len = zstream.next_out - compressed;
 497                write_or_die(1, compressed, out_len);
 498                compressed_size += out_len;
 499                zip_offset += compressed_size;
 500
 501                write_zip_data_desc(size, compressed_size, crc);
 502        } else if (compressed_size > 0) {
 503                write_or_die(1, out, compressed_size);
 504                zip_offset += compressed_size;
 505        }
 506
 507        free(deflated);
 508        free(buffer);
 509
 510        if (compressed_size > 0xffffffff || size > 0xffffffff ||
 511            offset > 0xffffffff) {
 512                if (compressed_size >= 0xffffffff)
 513                        zip64_dir_extra_payload_size += 8;
 514                if (size >= 0xffffffff)
 515                        zip64_dir_extra_payload_size += 8;
 516                if (offset >= 0xffffffff)
 517                        zip64_dir_extra_payload_size += 8;
 518                zip_dir_extra_size += 2 + 2 + zip64_dir_extra_payload_size;
 519        }
 520
 521        strbuf_add_le(&zip_dir, 4, 0x02014b50); /* magic */
 522        strbuf_add_le(&zip_dir, 2, creator_version);
 523        strbuf_add_le(&zip_dir, 2, version_needed);
 524        strbuf_add_le(&zip_dir, 2, flags);
 525        strbuf_add_le(&zip_dir, 2, method);
 526        strbuf_add_le(&zip_dir, 2, zip_time);
 527        strbuf_add_le(&zip_dir, 2, zip_date);
 528        strbuf_add_le(&zip_dir, 4, crc);
 529        strbuf_add_le(&zip_dir, 4, clamp32(compressed_size));
 530        strbuf_add_le(&zip_dir, 4, clamp32(size));
 531        strbuf_add_le(&zip_dir, 2, pathlen);
 532        strbuf_add_le(&zip_dir, 2, zip_dir_extra_size);
 533        strbuf_add_le(&zip_dir, 2, 0);          /* comment length */
 534        strbuf_add_le(&zip_dir, 2, 0);          /* disk */
 535        strbuf_add_le(&zip_dir, 2, !is_binary);
 536        strbuf_add_le(&zip_dir, 4, attr2);
 537        strbuf_add_le(&zip_dir, 4, clamp32(offset));
 538        strbuf_add(&zip_dir, path, pathlen);
 539        strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 540        if (zip64_dir_extra_payload_size) {
 541                strbuf_add_le(&zip_dir, 2, 0x0001);     /* magic */
 542                strbuf_add_le(&zip_dir, 2, zip64_dir_extra_payload_size);
 543                if (size >= 0xffffffff)
 544                        strbuf_add_le(&zip_dir, 8, size);
 545                if (compressed_size >= 0xffffffff)
 546                        strbuf_add_le(&zip_dir, 8, compressed_size);
 547                if (offset >= 0xffffffff)
 548                        strbuf_add_le(&zip_dir, 8, offset);
 549        }
 550        zip_dir_entries++;
 551
 552        return 0;
 553}
 554
 555static void write_zip64_trailer(void)
 556{
 557        struct zip64_dir_trailer trailer64;
 558        struct zip64_dir_trailer_locator locator64;
 559
 560        copy_le32(trailer64.magic, 0x06064b50);
 561        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 562        copy_le16(trailer64.creator_version, max_creator_version);
 563        copy_le16(trailer64.version, 45);
 564        copy_le32(trailer64.disk, 0);
 565        copy_le32(trailer64.directory_start_disk, 0);
 566        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 567        copy_le64(trailer64.entries, zip_dir_entries);
 568        copy_le64(trailer64.size, zip_dir.len);
 569        copy_le64(trailer64.offset, zip_offset);
 570
 571        copy_le32(locator64.magic, 0x07064b50);
 572        copy_le32(locator64.disk, 0);
 573        copy_le64(locator64.offset, zip_offset + zip_dir.len);
 574        copy_le32(locator64.number_of_disks, 1);
 575
 576        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 577        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 578}
 579
 580static void write_zip_trailer(const struct object_id *oid)
 581{
 582        struct zip_dir_trailer trailer;
 583        int clamped = 0;
 584
 585        copy_le32(trailer.magic, 0x06054b50);
 586        copy_le16(trailer.disk, 0);
 587        copy_le16(trailer.directory_start_disk, 0);
 588        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 589                        &clamped);
 590        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 591        copy_le32(trailer.size, zip_dir.len);
 592        copy_le32_clamp(trailer.offset, zip_offset, &clamped);
 593        copy_le16(trailer.comment_length, oid ? the_hash_algo->hexsz : 0);
 594
 595        write_or_die(1, zip_dir.buf, zip_dir.len);
 596        if (clamped)
 597                write_zip64_trailer();
 598        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 599        if (oid)
 600                write_or_die(1, oid_to_hex(oid), the_hash_algo->hexsz);
 601}
 602
 603static void dos_time(timestamp_t *timestamp, int *dos_date, int *dos_time)
 604{
 605        time_t time;
 606        struct tm *t;
 607
 608        if (date_overflows(*timestamp))
 609                die(_("timestamp too large for this system: %"PRItime),
 610                    *timestamp);
 611        time = (time_t)*timestamp;
 612        t = localtime(&time);
 613        *timestamp = time;
 614
 615        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 616                    (t->tm_year + 1900 - 1980) * 512;
 617        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 618}
 619
 620static int archive_zip_config(const char *var, const char *value, void *data)
 621{
 622        return userdiff_config(var, value);
 623}
 624
 625static int write_zip_archive(const struct archiver *ar,
 626                             struct archiver_args *args)
 627{
 628        int err;
 629
 630        git_config(archive_zip_config, NULL);
 631
 632        dos_time(&args->time, &zip_date, &zip_time);
 633
 634        strbuf_init(&zip_dir, 0);
 635
 636        err = write_archive_entries(args, write_zip_entry);
 637        if (!err)
 638                write_zip_trailer(args->commit_oid);
 639
 640        strbuf_release(&zip_dir);
 641
 642        return err;
 643}
 644
 645static struct archiver zip_archiver = {
 646        "zip",
 647        write_zip_archive,
 648        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 649};
 650
 651void init_zip_archiver(void)
 652{
 653        register_archiver(&zip_archiver);
 654}