Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include "cache.h"
   5#include "archive.h"
   6#include "streaming.h"
   7#include "utf8.h"
   8#include "userdiff.h"
   9#include "xdiff-interface.h"
  10
  11static int zip_date;
  12static int zip_time;
  13
  14static unsigned char *zip_dir;
  15static unsigned int zip_dir_size;
  16
  17static unsigned int zip_offset;
  18static unsigned int zip_dir_offset;
  19static uint64_t zip_dir_entries;
  20
  21static 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
  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 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
  71struct 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
  83struct 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
  91struct 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
 105struct 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
 132static void copy_le16(unsigned char *dest, unsigned int n)
 133{
 134        dest[0] = 0xff & n;
 135        dest[1] = 0xff & (n >> 010);
 136}
 137
 138static 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
 146static 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
 158static 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
 166static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 167{
 168        copy_le16(dest, clamp_max(n, 0xffff, clamped));
 169}
 170
 171static 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
 204static 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
 217static 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
 227static 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
 237static 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
 248static 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
 260static 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
 500static 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
 525static 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
 548static 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
 557static 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
 576static struct archiver zip_archiver = {
 577        "zip",
 578        write_zip_archive,
 579        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 580};
 581
 582void init_zip_archiver(void)
 583{
 584        register_archiver(&zip_archiver);
 585}