archive-zip.c

   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
  11 static int zip_date;
  12 static int zip_time;
  13
  14 static unsigned char *zip_dir;
  15 static unsigned int zip_dir_size;
  16
  17 static unsigned int zip_offset;
  18 static unsigned int zip_dir_offset;
  19 static uint64_t zip_dir_entries;
  20
  21 static unsigned int max_creator_version;
  22
  23 #define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  24 #define ZIP_STREAM      (1 <<  3)
  25 #define ZIP_UTF8        (1 << 11)
  26
  27 struct 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
  42 struct 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
  50 struct zip_dir_header {
  51         unsigned char magic[4];
  52         unsigned char creator_version[2];
  53         unsigned char version[2];
  54         unsigned char flags[2];
  55         unsigned char compression_method[2];
  56         unsigned char mtime[2];
  57         unsigned char mdate[2];
  58         unsigned char crc32[4];
  59         unsigned char compressed_size[4];
  60         unsigned char size[4];
  61         unsigned char filename_length[2];
  62         unsigned char extra_length[2];
  63         unsigned char comment_length[2];
  64         unsigned char disk[2];
  65         unsigned char attr1[2];
  66         unsigned char attr2[4];
  67         unsigned char offset[4];
  68         unsigned char _end[1];
  69 };
  70
  71 struct zip_dir_trailer {
  72         unsigned char magic[4];
  73         unsigned char disk[2];
  74         unsigned char directory_start_disk[2];
  75         unsigned char entries_on_this_disk[2];
  76         unsigned char entries[2];
  77         unsigned char size[4];
  78         unsigned char offset[4];
  79         unsigned char comment_length[2];
  80         unsigned char _end[1];
  81 };
  82
  83 struct zip_extra_mtime {
  84         unsigned char magic[2];
  85         unsigned char extra_size[2];
  86         unsigned char flags[1];
  87         unsigned char mtime[4];
  88         unsigned char _end[1];
  89 };
  90
  91 struct zip64_dir_trailer {
  92         unsigned char magic[4];
  93         unsigned char record_size[8];
  94         unsigned char creator_version[2];
  95         unsigned char version[2];
  96         unsigned char disk[4];
  97         unsigned char directory_start_disk[4];
  98         unsigned char entries_on_this_disk[8];
  99         unsigned char entries[8];
 100         unsigned char size[8];
 101         unsigned char offset[8];
 102         unsigned char _end[1];
 103 };
 104
 105 struct zip64_dir_trailer_locator {
 106         unsigned char magic[4];
 107         unsigned char disk[4];
 108         unsigned char offset[8];
 109         unsigned char number_of_disks[4];
 110         unsigned char _end[1];
 111 };
 112
 113 /*
 114  * On ARM, padding is added at the end of the struct, so a simple
 115  * sizeof(struct ...) reports two bytes more than the payload size
 116  * we're interested in.
 117  */
 118 #define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 119 #define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 120 #define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 121 #define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 122 #define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 123 #define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 124         (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 125 #define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 126 #define ZIP64_DIR_TRAILER_RECORD_SIZE \
 127         (ZIP64_DIR_TRAILER_SIZE - \
 128          offsetof(struct zip64_dir_trailer, creator_version))
 129 #define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 130         offsetof(struct zip64_dir_trailer_locator, _end)
 131
 132 static void copy_le16(unsigned char *dest, unsigned int n)
 133 {
 134         dest[0] = 0xff & n;
 135         dest[1] = 0xff & (n >> 010);
 136 }
 137
 138 static void copy_le32(unsigned char *dest, unsigned int n)
 139 {
 140         dest[0] = 0xff & n;
 141         dest[1] = 0xff & (n >> 010);
 142         dest[2] = 0xff & (n >> 020);
 143         dest[3] = 0xff & (n >> 030);
 144 }
 145
 146 static void copy_le64(unsigned char *dest, uint64_t n)
 147 {
 148         dest[0] = 0xff & n;
 149         dest[1] = 0xff & (n >> 010);
 150         dest[2] = 0xff & (n >> 020);
 151         dest[3] = 0xff & (n >> 030);
 152         dest[4] = 0xff & (n >> 040);
 153         dest[5] = 0xff & (n >> 050);
 154         dest[6] = 0xff & (n >> 060);
 155         dest[7] = 0xff & (n >> 070);
 156 }
 157
 158 static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 159 {
 160         if (n <= max)
 161                 return n;
 162         *clamped = 1;
 163         return max;
 164 }
 165
 166 static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 167 {
 168         copy_le16(dest, clamp_max(n, 0xffff, clamped));
 169 }
 170
 171 static void *zlib_deflate_raw(void *data, unsigned long size,
 172                               int compression_level,
 173                               unsigned long *compressed_size)
 174 {
 175         git_zstream stream;
 176         unsigned long maxsize;
 177         void *buffer;
 178         int result;
 179
 180         git_deflate_init_raw(&stream, compression_level);
 181         maxsize = git_deflate_bound(&stream, size);
 182         buffer = xmalloc(maxsize);
 183
 184         stream.next_in = data;
 185         stream.avail_in = size;
 186         stream.next_out = buffer;
 187         stream.avail_out = maxsize;
 188
 189         do {
 190                 result = git_deflate(&stream, Z_FINISH);
 191         } while (result == Z_OK);
 192
 193         if (result != Z_STREAM_END) {
 194                 free(buffer);
 195                 return NULL;
 196         }
 197
 198         git_deflate_end(&stream);
 199         *compressed_size = stream.total_out;
 200
 201         return buffer;
 202 }
 203
 204 static void write_zip_data_desc(unsigned long size,
 205                                 unsigned long compressed_size,
 206                                 unsigned long crc)
 207 {
 208         struct zip_data_desc trailer;
 209
 210         copy_le32(trailer.magic, 0x08074b50);
 211         copy_le32(trailer.crc32, crc);
 212         copy_le32(trailer.compressed_size, compressed_size);
 213         copy_le32(trailer.size, size);
 214         write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 215 }
 216
 217 static void set_zip_dir_data_desc(struct zip_dir_header *header,
 218                                   unsigned long size,
 219                                   unsigned long compressed_size,
 220                                   unsigned long crc)
 221 {
 222         copy_le32(header->crc32, crc);
 223         copy_le32(header->compressed_size, compressed_size);
 224         copy_le32(header->size, size);
 225 }
 226
 227 static void set_zip_header_data_desc(struct zip_local_header *header,
 228                                      unsigned long size,
 229                                      unsigned long compressed_size,
 230                                      unsigned long crc)
 231 {
 232         copy_le32(header->crc32, crc);
 233         copy_le32(header->compressed_size, compressed_size);
 234         copy_le32(header->size, size);
 235 }
 236
 237 static int has_only_ascii(const char *s)
 238 {
 239         for (;;) {
 240                 int c = *s++;
 241                 if (c == '\0')
 242                         return 1;
 243                 if (!isascii(c))
 244                         return 0;
 245         }
 246 }
 247
 248 static int entry_is_binary(const char *path, const void *buffer, size_t size)
 249 {
 250         struct userdiff_driver *driver = userdiff_find_by_path(path);
 251         if (!driver)
 252                 driver = userdiff_find_by_name("default");
 253         if (driver->binary != -1)
 254                 return driver->binary;
 255         return buffer_is_binary(buffer, size);
 256 }
 257
 258 #define STREAM_BUFFER_SIZE (1024 * 16)
 259
 260 static int write_zip_entry(struct archiver_args *args,
 261                            const unsigned char *sha1,
 262                            const char *path, size_t pathlen,
 263                            unsigned int mode)
 264 {
 265         struct zip_local_header header;
 266         struct zip_dir_header dirent;
 267         struct zip_extra_mtime extra;
 268         unsigned long attr2;
 269         unsigned long compressed_size;
 270         unsigned long crc;
 271         unsigned long direntsize;
 272         int method;
 273         unsigned char *out;
 274         void *deflated = NULL;
 275         void *buffer;
 276         struct git_istream *stream = NULL;
 277         unsigned long flags = 0;
 278         unsigned long size;
 279         int is_binary = -1;
 280         const char *path_without_prefix = path + args->baselen;
 281         unsigned int creator_version = 0;
 282
 283         crc = crc32(0, NULL, 0);
 284
 285         if (!has_only_ascii(path)) {
 286                 if (is_utf8(path))
 287                         flags |= ZIP_UTF8;
 288                 else
 289                         warning("Path is not valid UTF-8: %s", path);
 290         }
 291
 292         if (pathlen > 0xffff) {
 293                 return error("path too long (%d chars, SHA1: %s): %s",
 294                                 (int)pathlen, sha1_to_hex(sha1), path);
 295         }
 296
 297         if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 298                 method = 0;
 299                 attr2 = 16;
 300                 out = NULL;
 301                 size = 0;
 302                 compressed_size = 0;
 303                 buffer = NULL;
 304         } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 305                 enum object_type type = sha1_object_info(sha1, &size);
 306
 307                 method = 0;
 308                 attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 309                         (mode & 0111) ? ((mode) << 16) : 0;
 310                 if (S_ISLNK(mode) || (mode & 0111))
 311                         creator_version = 0x0317;
 312                 if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 313                         method = 8;
 314
 315                 if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 316                     size > big_file_threshold) {
 317                         stream = open_istream(sha1, &type, &size, NULL);
 318                         if (!stream)
 319                                 return error("cannot stream blob %s",
 320                                              sha1_to_hex(sha1));
 321                         flags |= ZIP_STREAM;
 322                         out = buffer = NULL;
 323                 } else {
 324                         buffer = sha1_file_to_archive(args, path, sha1, mode,
 325                                                       &type, &size);
 326                         if (!buffer)
 327                                 return error("cannot read %s",
 328                                              sha1_to_hex(sha1));
 329                         crc = crc32(crc, buffer, size);
 330                         is_binary = entry_is_binary(path_without_prefix,
 331                                                     buffer, size);
 332                         out = buffer;
 333                 }
 334                 compressed_size = (method == 0) ? size : 0;
 335         } else {
 336                 return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 337                                 sha1_to_hex(sha1));
 338         }
 339
 340         if (creator_version > max_creator_version)
 341                 max_creator_version = creator_version;
 342
 343         if (buffer && method == 8) {
 344                 out = deflated = zlib_deflate_raw(buffer, size,
 345                                                   args->compression_level,
 346                                                   &compressed_size);
 347                 if (!out || compressed_size >= size) {
 348                         out = buffer;
 349                         method = 0;
 350                         compressed_size = size;
 351                 }
 352         }
 353
 354         copy_le16(extra.magic, 0x5455);
 355         copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 356         extra.flags[0] = 1;     /* just mtime */
 357         copy_le32(extra.mtime, args->time);
 358
 359         /* make sure we have enough free space in the dictionary */
 360         direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
 361         while (zip_dir_size < zip_dir_offset + direntsize) {
 362                 zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 363                 zip_dir = xrealloc(zip_dir, zip_dir_size);
 364         }
 365
 366         copy_le32(dirent.magic, 0x02014b50);
 367         copy_le16(dirent.creator_version, creator_version);
 368         copy_le16(dirent.version, 10);
 369         copy_le16(dirent.flags, flags);
 370         copy_le16(dirent.compression_method, method);
 371         copy_le16(dirent.mtime, zip_time);
 372         copy_le16(dirent.mdate, zip_date);
 373         set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 374         copy_le16(dirent.filename_length, pathlen);
 375         copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
 376         copy_le16(dirent.comment_length, 0);
 377         copy_le16(dirent.disk, 0);
 378         copy_le32(dirent.attr2, attr2);
 379         copy_le32(dirent.offset, zip_offset);
 380
 381         copy_le32(header.magic, 0x04034b50);
 382         copy_le16(header.version, 10);
 383         copy_le16(header.flags, flags);
 384         copy_le16(header.compression_method, method);
 385         copy_le16(header.mtime, zip_time);
 386         copy_le16(header.mdate, zip_date);
 387         set_zip_header_data_desc(&header, size, compressed_size, crc);
 388         copy_le16(header.filename_length, pathlen);
 389         copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
 390         write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 391         zip_offset += ZIP_LOCAL_HEADER_SIZE;
 392         write_or_die(1, path, pathlen);
 393         zip_offset += pathlen;
 394         write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 395         zip_offset += ZIP_EXTRA_MTIME_SIZE;
 396         if (stream && method == 0) {
 397                 unsigned char buf[STREAM_BUFFER_SIZE];
 398                 ssize_t readlen;
 399
 400                 for (;;) {
 401                         readlen = read_istream(stream, buf, sizeof(buf));
 402                         if (readlen <= 0)
 403                                 break;
 404                         crc = crc32(crc, buf, readlen);
 405                         if (is_binary == -1)
 406                                 is_binary = entry_is_binary(path_without_prefix,
 407                                                             buf, readlen);
 408                         write_or_die(1, buf, readlen);
 409                 }
 410                 close_istream(stream);
 411                 if (readlen)
 412                         return readlen;
 413
 414                 compressed_size = size;
 415                 zip_offset += compressed_size;
 416
 417                 write_zip_data_desc(size, compressed_size, crc);
 418                 zip_offset += ZIP_DATA_DESC_SIZE;
 419
 420                 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 421         } else if (stream && method == 8) {
 422                 unsigned char buf[STREAM_BUFFER_SIZE];
 423                 ssize_t readlen;
 424                 git_zstream zstream;
 425                 int result;
 426                 size_t out_len;
 427                 unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 428
 429                 git_deflate_init_raw(&zstream, args->compression_level);
 430
 431                 compressed_size = 0;
 432                 zstream.next_out = compressed;
 433                 zstream.avail_out = sizeof(compressed);
 434
 435                 for (;;) {
 436                         readlen = read_istream(stream, buf, sizeof(buf));
 437                         if (readlen <= 0)
 438                                 break;
 439                         crc = crc32(crc, buf, readlen);
 440                         if (is_binary == -1)
 441                                 is_binary = entry_is_binary(path_without_prefix,
 442                                                             buf, readlen);
 443
 444                         zstream.next_in = buf;
 445                         zstream.avail_in = readlen;
 446                         result = git_deflate(&zstream, 0);
 447                         if (result != Z_OK)
 448                                 die("deflate error (%d)", result);
 449                         out_len = zstream.next_out - compressed;
 450
 451                         if (out_len > 0) {
 452                                 write_or_die(1, compressed, out_len);
 453                                 compressed_size += out_len;
 454                                 zstream.next_out = compressed;
 455                                 zstream.avail_out = sizeof(compressed);
 456                         }
 457
 458                 }
 459                 close_istream(stream);
 460                 if (readlen)
 461                         return readlen;
 462
 463                 zstream.next_in = buf;
 464                 zstream.avail_in = 0;
 465                 result = git_deflate(&zstream, Z_FINISH);
 466                 if (result != Z_STREAM_END)
 467                         die("deflate error (%d)", result);
 468
 469                 git_deflate_end(&zstream);
 470                 out_len = zstream.next_out - compressed;
 471                 write_or_die(1, compressed, out_len);
 472                 compressed_size += out_len;
 473                 zip_offset += compressed_size;
 474
 475                 write_zip_data_desc(size, compressed_size, crc);
 476                 zip_offset += ZIP_DATA_DESC_SIZE;
 477
 478                 set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 479         } else if (compressed_size > 0) {
 480                 write_or_die(1, out, compressed_size);
 481                 zip_offset += compressed_size;
 482         }
 483
 484         free(deflated);
 485         free(buffer);
 486
 487         copy_le16(dirent.attr1, !is_binary);
 488
 489         memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 490         zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 491         memcpy(zip_dir + zip_dir_offset, path, pathlen);
 492         zip_dir_offset += pathlen;
 493         memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
 494         zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
 495         zip_dir_entries++;
 496
 497         return 0;
 498 }
 499
 500 static void write_zip64_trailer(void)
 501 {
 502         struct zip64_dir_trailer trailer64;
 503         struct zip64_dir_trailer_locator locator64;
 504
 505         copy_le32(trailer64.magic, 0x06064b50);
 506         copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 507         copy_le16(trailer64.creator_version, max_creator_version);
 508         copy_le16(trailer64.version, 45);
 509         copy_le32(trailer64.disk, 0);
 510         copy_le32(trailer64.directory_start_disk, 0);
 511         copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 512         copy_le64(trailer64.entries, zip_dir_entries);
 513         copy_le64(trailer64.size, zip_dir_offset);
 514         copy_le64(trailer64.offset, zip_offset);
 515
 516         copy_le32(locator64.magic, 0x07064b50);
 517         copy_le32(locator64.disk, 0);
 518         copy_le64(locator64.offset, zip_offset + zip_dir_offset);
 519         copy_le32(locator64.number_of_disks, 1);
 520
 521         write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 522         write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 523 }
 524
 525 static void write_zip_trailer(const unsigned char *sha1)
 526 {
 527         struct zip_dir_trailer trailer;
 528         int clamped = 0;
 529
 530         copy_le32(trailer.magic, 0x06054b50);
 531         copy_le16(trailer.disk, 0);
 532         copy_le16(trailer.directory_start_disk, 0);
 533         copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 534                         &clamped);
 535         copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 536         copy_le32(trailer.size, zip_dir_offset);
 537         copy_le32(trailer.offset, zip_offset);
 538         copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 539
 540         write_or_die(1, zip_dir, zip_dir_offset);
 541         if (clamped)
 542                 write_zip64_trailer();
 543         write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 544         if (sha1)
 545                 write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 546 }
 547
 548 static void dos_time(time_t *time, int *dos_date, int *dos_time)
 549 {
 550         struct tm *t = localtime(time);
 551
 552         *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 553                     (t->tm_year + 1900 - 1980) * 512;
 554         *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 555 }
 556
 557 static int write_zip_archive(const struct archiver *ar,
 558                              struct archiver_args *args)
 559 {
 560         int err;
 561
 562         dos_time(&args->time, &zip_date, &zip_time);
 563
 564         zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 565         zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 566
 567         err = write_archive_entries(args, write_zip_entry);
 568         if (!err)
 569                 write_zip_trailer(args->commit_sha1);
 570
 571         free(zip_dir);
 572
 573         return err;
 574 }
 575
 576 static struct archiver zip_archiver = {
 577         "zip",
 578         write_zip_archive,
 579         ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 580 };
 581
 582 void init_zip_archiver(void)
 583 {
 584         register_archiver(&zip_archiver);
 585 }