Andrew's git - gitweb.git/blob

a6fac59602a2afa65a28002e7aa3248524f2e0d7
   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
  14/* We only care about the "buf" part here. */
  15static struct strbuf zip_dir;
  16
  17static unsigned int zip_offset;
  18static uint64_t zip_dir_entries;
  19
  20static unsigned int max_creator_version;
  21
  22#define ZIP_STREAM      (1 <<  3)
  23#define ZIP_UTF8        (1 << 11)
  24
  25struct zip_local_header {
  26        unsigned char magic[4];
  27        unsigned char version[2];
  28        unsigned char flags[2];
  29        unsigned char compression_method[2];
  30        unsigned char mtime[2];
  31        unsigned char mdate[2];
  32        unsigned char crc32[4];
  33        unsigned char compressed_size[4];
  34        unsigned char size[4];
  35        unsigned char filename_length[2];
  36        unsigned char extra_length[2];
  37        unsigned char _end[1];
  38};
  39
  40struct zip_data_desc {
  41        unsigned char magic[4];
  42        unsigned char crc32[4];
  43        unsigned char compressed_size[4];
  44        unsigned char size[4];
  45        unsigned char _end[1];
  46};
  47
  48struct zip_dir_header {
  49        unsigned char magic[4];
  50        unsigned char creator_version[2];
  51        unsigned char version[2];
  52        unsigned char flags[2];
  53        unsigned char compression_method[2];
  54        unsigned char mtime[2];
  55        unsigned char mdate[2];
  56        unsigned char crc32[4];
  57        unsigned char compressed_size[4];
  58        unsigned char size[4];
  59        unsigned char filename_length[2];
  60        unsigned char extra_length[2];
  61        unsigned char comment_length[2];
  62        unsigned char disk[2];
  63        unsigned char attr1[2];
  64        unsigned char attr2[4];
  65        unsigned char offset[4];
  66        unsigned char _end[1];
  67};
  68
  69struct zip_dir_trailer {
  70        unsigned char magic[4];
  71        unsigned char disk[2];
  72        unsigned char directory_start_disk[2];
  73        unsigned char entries_on_this_disk[2];
  74        unsigned char entries[2];
  75        unsigned char size[4];
  76        unsigned char offset[4];
  77        unsigned char comment_length[2];
  78        unsigned char _end[1];
  79};
  80
  81struct zip_extra_mtime {
  82        unsigned char magic[2];
  83        unsigned char extra_size[2];
  84        unsigned char flags[1];
  85        unsigned char mtime[4];
  86        unsigned char _end[1];
  87};
  88
  89struct zip64_dir_trailer {
  90        unsigned char magic[4];
  91        unsigned char record_size[8];
  92        unsigned char creator_version[2];
  93        unsigned char version[2];
  94        unsigned char disk[4];
  95        unsigned char directory_start_disk[4];
  96        unsigned char entries_on_this_disk[8];
  97        unsigned char entries[8];
  98        unsigned char size[8];
  99        unsigned char offset[8];
 100        unsigned char _end[1];
 101};
 102
 103struct zip64_dir_trailer_locator {
 104        unsigned char magic[4];
 105        unsigned char disk[4];
 106        unsigned char offset[8];
 107        unsigned char number_of_disks[4];
 108        unsigned char _end[1];
 109};
 110
 111/*
 112 * On ARM, padding is added at the end of the struct, so a simple
 113 * sizeof(struct ...) reports two bytes more than the payload size
 114 * we're interested in.
 115 */
 116#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 117#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 118#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 119#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 120#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 121#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 122        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 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 *zlib_deflate_raw(void *data, unsigned long size,
 170                              int compression_level,
 171                              unsigned long *compressed_size)
 172{
 173        git_zstream stream;
 174        unsigned long maxsize;
 175        void *buffer;
 176        int result;
 177
 178        git_deflate_init_raw(&stream, compression_level);
 179        maxsize = git_deflate_bound(&stream, size);
 180        buffer = xmalloc(maxsize);
 181
 182        stream.next_in = data;
 183        stream.avail_in = size;
 184        stream.next_out = buffer;
 185        stream.avail_out = maxsize;
 186
 187        do {
 188                result = git_deflate(&stream, Z_FINISH);
 189        } while (result == Z_OK);
 190
 191        if (result != Z_STREAM_END) {
 192                free(buffer);
 193                return NULL;
 194        }
 195
 196        git_deflate_end(&stream);
 197        *compressed_size = stream.total_out;
 198
 199        return buffer;
 200}
 201
 202static void write_zip_data_desc(unsigned long size,
 203                                unsigned long compressed_size,
 204                                unsigned long crc)
 205{
 206        struct zip_data_desc trailer;
 207
 208        copy_le32(trailer.magic, 0x08074b50);
 209        copy_le32(trailer.crc32, crc);
 210        copy_le32(trailer.compressed_size, compressed_size);
 211        copy_le32(trailer.size, size);
 212        write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 213}
 214
 215static void set_zip_dir_data_desc(struct zip_dir_header *header,
 216                                  unsigned long size,
 217                                  unsigned long compressed_size,
 218                                  unsigned long crc)
 219{
 220        copy_le32(header->crc32, crc);
 221        copy_le32(header->compressed_size, compressed_size);
 222        copy_le32(header->size, size);
 223}
 224
 225static void set_zip_header_data_desc(struct zip_local_header *header,
 226                                     unsigned long size,
 227                                     unsigned long compressed_size,
 228                                     unsigned long crc)
 229{
 230        copy_le32(header->crc32, crc);
 231        copy_le32(header->compressed_size, compressed_size);
 232        copy_le32(header->size, size);
 233}
 234
 235static int has_only_ascii(const char *s)
 236{
 237        for (;;) {
 238                int c = *s++;
 239                if (c == '\0')
 240                        return 1;
 241                if (!isascii(c))
 242                        return 0;
 243        }
 244}
 245
 246static int entry_is_binary(const char *path, const void *buffer, size_t size)
 247{
 248        struct userdiff_driver *driver = userdiff_find_by_path(path);
 249        if (!driver)
 250                driver = userdiff_find_by_name("default");
 251        if (driver->binary != -1)
 252                return driver->binary;
 253        return buffer_is_binary(buffer, size);
 254}
 255
 256#define STREAM_BUFFER_SIZE (1024 * 16)
 257
 258static int write_zip_entry(struct archiver_args *args,
 259                           const unsigned char *sha1,
 260                           const char *path, size_t pathlen,
 261                           unsigned int mode)
 262{
 263        struct zip_local_header header;
 264        struct zip_dir_header dirent;
 265        struct zip_extra_mtime extra;
 266        unsigned long attr2;
 267        unsigned long compressed_size;
 268        unsigned long crc;
 269        int method;
 270        unsigned char *out;
 271        void *deflated = NULL;
 272        void *buffer;
 273        struct git_istream *stream = NULL;
 274        unsigned long flags = 0;
 275        unsigned long size;
 276        int is_binary = -1;
 277        const char *path_without_prefix = path + args->baselen;
 278        unsigned int creator_version = 0;
 279
 280        crc = crc32(0, NULL, 0);
 281
 282        if (!has_only_ascii(path)) {
 283                if (is_utf8(path))
 284                        flags |= ZIP_UTF8;
 285                else
 286                        warning("Path is not valid UTF-8: %s", path);
 287        }
 288
 289        if (pathlen > 0xffff) {
 290                return error("path too long (%d chars, SHA1: %s): %s",
 291                                (int)pathlen, sha1_to_hex(sha1), path);
 292        }
 293
 294        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 295                method = 0;
 296                attr2 = 16;
 297                out = NULL;
 298                size = 0;
 299                compressed_size = 0;
 300                buffer = NULL;
 301        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 302                enum object_type type = sha1_object_info(sha1, &size);
 303
 304                method = 0;
 305                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 306                        (mode & 0111) ? ((mode) << 16) : 0;
 307                if (S_ISLNK(mode) || (mode & 0111))
 308                        creator_version = 0x0317;
 309                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 310                        method = 8;
 311
 312                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 313                    size > big_file_threshold) {
 314                        stream = open_istream(sha1, &type, &size, NULL);
 315                        if (!stream)
 316                                return error("cannot stream blob %s",
 317                                             sha1_to_hex(sha1));
 318                        flags |= ZIP_STREAM;
 319                        out = buffer = NULL;
 320                } else {
 321                        buffer = sha1_file_to_archive(args, path, sha1, mode,
 322                                                      &type, &size);
 323                        if (!buffer)
 324                                return error("cannot read %s",
 325                                             sha1_to_hex(sha1));
 326                        crc = crc32(crc, buffer, size);
 327                        is_binary = entry_is_binary(path_without_prefix,
 328                                                    buffer, size);
 329                        out = buffer;
 330                }
 331                compressed_size = (method == 0) ? size : 0;
 332        } else {
 333                return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 334                                sha1_to_hex(sha1));
 335        }
 336
 337        if (creator_version > max_creator_version)
 338                max_creator_version = creator_version;
 339
 340        if (buffer && method == 8) {
 341                out = deflated = zlib_deflate_raw(buffer, size,
 342                                                  args->compression_level,
 343                                                  &compressed_size);
 344                if (!out || compressed_size >= size) {
 345                        out = buffer;
 346                        method = 0;
 347                        compressed_size = size;
 348                }
 349        }
 350
 351        copy_le16(extra.magic, 0x5455);
 352        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 353        extra.flags[0] = 1;     /* just mtime */
 354        copy_le32(extra.mtime, args->time);
 355
 356        copy_le32(dirent.magic, 0x02014b50);
 357        copy_le16(dirent.creator_version, creator_version);
 358        copy_le16(dirent.version, 10);
 359        copy_le16(dirent.flags, flags);
 360        copy_le16(dirent.compression_method, method);
 361        copy_le16(dirent.mtime, zip_time);
 362        copy_le16(dirent.mdate, zip_date);
 363        set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 364        copy_le16(dirent.filename_length, pathlen);
 365        copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
 366        copy_le16(dirent.comment_length, 0);
 367        copy_le16(dirent.disk, 0);
 368        copy_le32(dirent.attr2, attr2);
 369        copy_le32(dirent.offset, zip_offset);
 370
 371        copy_le32(header.magic, 0x04034b50);
 372        copy_le16(header.version, 10);
 373        copy_le16(header.flags, flags);
 374        copy_le16(header.compression_method, method);
 375        copy_le16(header.mtime, zip_time);
 376        copy_le16(header.mdate, zip_date);
 377        set_zip_header_data_desc(&header, size, compressed_size, crc);
 378        copy_le16(header.filename_length, pathlen);
 379        copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
 380        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 381        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 382        write_or_die(1, path, pathlen);
 383        zip_offset += pathlen;
 384        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 385        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 386        if (stream && method == 0) {
 387                unsigned char buf[STREAM_BUFFER_SIZE];
 388                ssize_t readlen;
 389
 390                for (;;) {
 391                        readlen = read_istream(stream, buf, sizeof(buf));
 392                        if (readlen <= 0)
 393                                break;
 394                        crc = crc32(crc, buf, readlen);
 395                        if (is_binary == -1)
 396                                is_binary = entry_is_binary(path_without_prefix,
 397                                                            buf, readlen);
 398                        write_or_die(1, buf, readlen);
 399                }
 400                close_istream(stream);
 401                if (readlen)
 402                        return readlen;
 403
 404                compressed_size = size;
 405                zip_offset += compressed_size;
 406
 407                write_zip_data_desc(size, compressed_size, crc);
 408                zip_offset += ZIP_DATA_DESC_SIZE;
 409
 410                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 411        } else if (stream && method == 8) {
 412                unsigned char buf[STREAM_BUFFER_SIZE];
 413                ssize_t readlen;
 414                git_zstream zstream;
 415                int result;
 416                size_t out_len;
 417                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 418
 419                git_deflate_init_raw(&zstream, args->compression_level);
 420
 421                compressed_size = 0;
 422                zstream.next_out = compressed;
 423                zstream.avail_out = sizeof(compressed);
 424
 425                for (;;) {
 426                        readlen = read_istream(stream, buf, sizeof(buf));
 427                        if (readlen <= 0)
 428                                break;
 429                        crc = crc32(crc, buf, readlen);
 430                        if (is_binary == -1)
 431                                is_binary = entry_is_binary(path_without_prefix,
 432                                                            buf, readlen);
 433
 434                        zstream.next_in = buf;
 435                        zstream.avail_in = readlen;
 436                        result = git_deflate(&zstream, 0);
 437                        if (result != Z_OK)
 438                                die("deflate error (%d)", result);
 439                        out_len = zstream.next_out - compressed;
 440
 441                        if (out_len > 0) {
 442                                write_or_die(1, compressed, out_len);
 443                                compressed_size += out_len;
 444                                zstream.next_out = compressed;
 445                                zstream.avail_out = sizeof(compressed);
 446                        }
 447
 448                }
 449                close_istream(stream);
 450                if (readlen)
 451                        return readlen;
 452
 453                zstream.next_in = buf;
 454                zstream.avail_in = 0;
 455                result = git_deflate(&zstream, Z_FINISH);
 456                if (result != Z_STREAM_END)
 457                        die("deflate error (%d)", result);
 458
 459                git_deflate_end(&zstream);
 460                out_len = zstream.next_out - compressed;
 461                write_or_die(1, compressed, out_len);
 462                compressed_size += out_len;
 463                zip_offset += compressed_size;
 464
 465                write_zip_data_desc(size, compressed_size, crc);
 466                zip_offset += ZIP_DATA_DESC_SIZE;
 467
 468                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 469        } else if (compressed_size > 0) {
 470                write_or_die(1, out, compressed_size);
 471                zip_offset += compressed_size;
 472        }
 473
 474        free(deflated);
 475        free(buffer);
 476
 477        copy_le16(dirent.attr1, !is_binary);
 478
 479        strbuf_add(&zip_dir, &dirent, ZIP_DIR_HEADER_SIZE);
 480        strbuf_add(&zip_dir, path, pathlen);
 481        strbuf_add(&zip_dir, &extra, ZIP_EXTRA_MTIME_SIZE);
 482        zip_dir_entries++;
 483
 484        return 0;
 485}
 486
 487static void write_zip64_trailer(void)
 488{
 489        struct zip64_dir_trailer trailer64;
 490        struct zip64_dir_trailer_locator locator64;
 491
 492        copy_le32(trailer64.magic, 0x06064b50);
 493        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 494        copy_le16(trailer64.creator_version, max_creator_version);
 495        copy_le16(trailer64.version, 45);
 496        copy_le32(trailer64.disk, 0);
 497        copy_le32(trailer64.directory_start_disk, 0);
 498        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 499        copy_le64(trailer64.entries, zip_dir_entries);
 500        copy_le64(trailer64.size, zip_dir.len);
 501        copy_le64(trailer64.offset, zip_offset);
 502
 503        copy_le32(locator64.magic, 0x07064b50);
 504        copy_le32(locator64.disk, 0);
 505        copy_le64(locator64.offset, zip_offset + zip_dir.len);
 506        copy_le32(locator64.number_of_disks, 1);
 507
 508        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 509        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 510}
 511
 512static void write_zip_trailer(const unsigned char *sha1)
 513{
 514        struct zip_dir_trailer trailer;
 515        int clamped = 0;
 516
 517        copy_le32(trailer.magic, 0x06054b50);
 518        copy_le16(trailer.disk, 0);
 519        copy_le16(trailer.directory_start_disk, 0);
 520        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 521                        &clamped);
 522        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 523        copy_le32(trailer.size, zip_dir.len);
 524        copy_le32(trailer.offset, zip_offset);
 525        copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 526
 527        write_or_die(1, zip_dir.buf, zip_dir.len);
 528        if (clamped)
 529                write_zip64_trailer();
 530        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 531        if (sha1)
 532                write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 533}
 534
 535static void dos_time(time_t *time, int *dos_date, int *dos_time)
 536{
 537        struct tm *t = localtime(time);
 538
 539        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 540                    (t->tm_year + 1900 - 1980) * 512;
 541        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 542}
 543
 544static int archive_zip_config(const char *var, const char *value, void *data)
 545{
 546        return userdiff_config(var, value);
 547}
 548
 549static int write_zip_archive(const struct archiver *ar,
 550                             struct archiver_args *args)
 551{
 552        int err;
 553
 554        git_config(archive_zip_config, NULL);
 555
 556        dos_time(&args->time, &zip_date, &zip_time);
 557
 558        strbuf_init(&zip_dir, 0);
 559
 560        err = write_archive_entries(args, write_zip_entry);
 561        if (!err)
 562                write_zip_trailer(args->commit_sha1);
 563
 564        strbuf_release(&zip_dir);
 565
 566        return err;
 567}
 568
 569static struct archiver zip_archiver = {
 570        "zip",
 571        write_zip_archive,
 572        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 573};
 574
 575void init_zip_archiver(void)
 576{
 577        register_archiver(&zip_archiver);
 578}