Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include "cache.h"
   5#include "config.h"
   6#include "archive.h"
   7#include "streaming.h"
   8#include "utf8.h"
   9#include "userdiff.h"
  10#include "xdiff-interface.h"
  11
  12static int zip_date;
  13static int zip_time;
  14
  15static unsigned char *zip_dir;
  16static unsigned int zip_dir_size;
  17
  18static unsigned int zip_offset;
  19static unsigned int zip_dir_offset;
  20static uint64_t zip_dir_entries;
  21
  22static unsigned int max_creator_version;
  23
  24#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  25#define ZIP_STREAM      (1 <<  3)
  26#define ZIP_UTF8        (1 << 11)
  27
  28struct zip_local_header {
  29        unsigned char magic[4];
  30        unsigned char version[2];
  31        unsigned char flags[2];
  32        unsigned char compression_method[2];
  33        unsigned char mtime[2];
  34        unsigned char mdate[2];
  35        unsigned char crc32[4];
  36        unsigned char compressed_size[4];
  37        unsigned char size[4];
  38        unsigned char filename_length[2];
  39        unsigned char extra_length[2];
  40        unsigned char _end[1];
  41};
  42
  43struct zip_data_desc {
  44        unsigned char magic[4];
  45        unsigned char crc32[4];
  46        unsigned char compressed_size[4];
  47        unsigned char size[4];
  48        unsigned char _end[1];
  49};
  50
  51struct zip_dir_header {
  52        unsigned char magic[4];
  53        unsigned char creator_version[2];
  54        unsigned char version[2];
  55        unsigned char flags[2];
  56        unsigned char compression_method[2];
  57        unsigned char mtime[2];
  58        unsigned char mdate[2];
  59        unsigned char crc32[4];
  60        unsigned char compressed_size[4];
  61        unsigned char size[4];
  62        unsigned char filename_length[2];
  63        unsigned char extra_length[2];
  64        unsigned char comment_length[2];
  65        unsigned char disk[2];
  66        unsigned char attr1[2];
  67        unsigned char attr2[4];
  68        unsigned char offset[4];
  69        unsigned char _end[1];
  70};
  71
  72struct zip_dir_trailer {
  73        unsigned char magic[4];
  74        unsigned char disk[2];
  75        unsigned char directory_start_disk[2];
  76        unsigned char entries_on_this_disk[2];
  77        unsigned char entries[2];
  78        unsigned char size[4];
  79        unsigned char offset[4];
  80        unsigned char comment_length[2];
  81        unsigned char _end[1];
  82};
  83
  84struct zip_extra_mtime {
  85        unsigned char magic[2];
  86        unsigned char extra_size[2];
  87        unsigned char flags[1];
  88        unsigned char mtime[4];
  89        unsigned char _end[1];
  90};
  91
  92struct zip64_dir_trailer {
  93        unsigned char magic[4];
  94        unsigned char record_size[8];
  95        unsigned char creator_version[2];
  96        unsigned char version[2];
  97        unsigned char disk[4];
  98        unsigned char directory_start_disk[4];
  99        unsigned char entries_on_this_disk[8];
 100        unsigned char entries[8];
 101        unsigned char size[8];
 102        unsigned char offset[8];
 103        unsigned char _end[1];
 104};
 105
 106struct zip64_dir_trailer_locator {
 107        unsigned char magic[4];
 108        unsigned char disk[4];
 109        unsigned char offset[8];
 110        unsigned char number_of_disks[4];
 111        unsigned char _end[1];
 112};
 113
 114/*
 115 * On ARM, padding is added at the end of the struct, so a simple
 116 * sizeof(struct ...) reports two bytes more than the payload size
 117 * we're interested in.
 118 */
 119#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
 120#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
 121#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
 122#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
 123#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
 124#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
 125        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
 126#define ZIP64_DIR_TRAILER_SIZE  offsetof(struct zip64_dir_trailer, _end)
 127#define ZIP64_DIR_TRAILER_RECORD_SIZE \
 128        (ZIP64_DIR_TRAILER_SIZE - \
 129         offsetof(struct zip64_dir_trailer, creator_version))
 130#define ZIP64_DIR_TRAILER_LOCATOR_SIZE \
 131        offsetof(struct zip64_dir_trailer_locator, _end)
 132
 133static void copy_le16(unsigned char *dest, unsigned int n)
 134{
 135        dest[0] = 0xff & n;
 136        dest[1] = 0xff & (n >> 010);
 137}
 138
 139static void copy_le32(unsigned char *dest, unsigned int n)
 140{
 141        dest[0] = 0xff & n;
 142        dest[1] = 0xff & (n >> 010);
 143        dest[2] = 0xff & (n >> 020);
 144        dest[3] = 0xff & (n >> 030);
 145}
 146
 147static void copy_le64(unsigned char *dest, uint64_t n)
 148{
 149        dest[0] = 0xff & n;
 150        dest[1] = 0xff & (n >> 010);
 151        dest[2] = 0xff & (n >> 020);
 152        dest[3] = 0xff & (n >> 030);
 153        dest[4] = 0xff & (n >> 040);
 154        dest[5] = 0xff & (n >> 050);
 155        dest[6] = 0xff & (n >> 060);
 156        dest[7] = 0xff & (n >> 070);
 157}
 158
 159static uint64_t clamp_max(uint64_t n, uint64_t max, int *clamped)
 160{
 161        if (n <= max)
 162                return n;
 163        *clamped = 1;
 164        return max;
 165}
 166
 167static void copy_le16_clamp(unsigned char *dest, uint64_t n, int *clamped)
 168{
 169        copy_le16(dest, clamp_max(n, 0xffff, clamped));
 170}
 171
 172static void *zlib_deflate_raw(void *data, unsigned long size,
 173                              int compression_level,
 174                              unsigned long *compressed_size)
 175{
 176        git_zstream stream;
 177        unsigned long maxsize;
 178        void *buffer;
 179        int result;
 180
 181        git_deflate_init_raw(&stream, compression_level);
 182        maxsize = git_deflate_bound(&stream, size);
 183        buffer = xmalloc(maxsize);
 184
 185        stream.next_in = data;
 186        stream.avail_in = size;
 187        stream.next_out = buffer;
 188        stream.avail_out = maxsize;
 189
 190        do {
 191                result = git_deflate(&stream, Z_FINISH);
 192        } while (result == Z_OK);
 193
 194        if (result != Z_STREAM_END) {
 195                free(buffer);
 196                return NULL;
 197        }
 198
 199        git_deflate_end(&stream);
 200        *compressed_size = stream.total_out;
 201
 202        return buffer;
 203}
 204
 205static void write_zip_data_desc(unsigned long size,
 206                                unsigned long compressed_size,
 207                                unsigned long crc)
 208{
 209        struct zip_data_desc trailer;
 210
 211        copy_le32(trailer.magic, 0x08074b50);
 212        copy_le32(trailer.crc32, crc);
 213        copy_le32(trailer.compressed_size, compressed_size);
 214        copy_le32(trailer.size, size);
 215        write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 216}
 217
 218static void set_zip_dir_data_desc(struct zip_dir_header *header,
 219                                  unsigned long size,
 220                                  unsigned long compressed_size,
 221                                  unsigned long crc)
 222{
 223        copy_le32(header->crc32, crc);
 224        copy_le32(header->compressed_size, compressed_size);
 225        copy_le32(header->size, size);
 226}
 227
 228static void set_zip_header_data_desc(struct zip_local_header *header,
 229                                     unsigned long size,
 230                                     unsigned long compressed_size,
 231                                     unsigned long crc)
 232{
 233        copy_le32(header->crc32, crc);
 234        copy_le32(header->compressed_size, compressed_size);
 235        copy_le32(header->size, size);
 236}
 237
 238static int has_only_ascii(const char *s)
 239{
 240        for (;;) {
 241                int c = *s++;
 242                if (c == '\0')
 243                        return 1;
 244                if (!isascii(c))
 245                        return 0;
 246        }
 247}
 248
 249static int entry_is_binary(const char *path, const void *buffer, size_t size)
 250{
 251        struct userdiff_driver *driver = userdiff_find_by_path(path);
 252        if (!driver)
 253                driver = userdiff_find_by_name("default");
 254        if (driver->binary != -1)
 255                return driver->binary;
 256        return buffer_is_binary(buffer, size);
 257}
 258
 259#define STREAM_BUFFER_SIZE (1024 * 16)
 260
 261static int write_zip_entry(struct archiver_args *args,
 262                           const unsigned char *sha1,
 263                           const char *path, size_t pathlen,
 264                           unsigned int mode)
 265{
 266        struct zip_local_header header;
 267        struct zip_dir_header dirent;
 268        struct zip_extra_mtime extra;
 269        unsigned long attr2;
 270        unsigned long compressed_size;
 271        unsigned long crc;
 272        unsigned long direntsize;
 273        int method;
 274        unsigned char *out;
 275        void *deflated = NULL;
 276        void *buffer;
 277        struct git_istream *stream = NULL;
 278        unsigned long flags = 0;
 279        unsigned long size;
 280        int is_binary = -1;
 281        const char *path_without_prefix = path + args->baselen;
 282        unsigned int creator_version = 0;
 283
 284        crc = crc32(0, NULL, 0);
 285
 286        if (!has_only_ascii(path)) {
 287                if (is_utf8(path))
 288                        flags |= ZIP_UTF8;
 289                else
 290                        warning("Path is not valid UTF-8: %s", path);
 291        }
 292
 293        if (pathlen > 0xffff) {
 294                return error("path too long (%d chars, SHA1: %s): %s",
 295                                (int)pathlen, sha1_to_hex(sha1), path);
 296        }
 297
 298        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 299                method = 0;
 300                attr2 = 16;
 301                out = NULL;
 302                size = 0;
 303                compressed_size = 0;
 304                buffer = NULL;
 305        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 306                enum object_type type = sha1_object_info(sha1, &size);
 307
 308                method = 0;
 309                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 310                        (mode & 0111) ? ((mode) << 16) : 0;
 311                if (S_ISLNK(mode) || (mode & 0111))
 312                        creator_version = 0x0317;
 313                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 314                        method = 8;
 315
 316                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 317                    size > big_file_threshold) {
 318                        stream = open_istream(sha1, &type, &size, NULL);
 319                        if (!stream)
 320                                return error("cannot stream blob %s",
 321                                             sha1_to_hex(sha1));
 322                        flags |= ZIP_STREAM;
 323                        out = buffer = NULL;
 324                } else {
 325                        buffer = sha1_file_to_archive(args, path, sha1, mode,
 326                                                      &type, &size);
 327                        if (!buffer)
 328                                return error("cannot read %s",
 329                                             sha1_to_hex(sha1));
 330                        crc = crc32(crc, buffer, size);
 331                        is_binary = entry_is_binary(path_without_prefix,
 332                                                    buffer, size);
 333                        out = buffer;
 334                }
 335                compressed_size = (method == 0) ? size : 0;
 336        } else {
 337                return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 338                                sha1_to_hex(sha1));
 339        }
 340
 341        if (creator_version > max_creator_version)
 342                max_creator_version = creator_version;
 343
 344        if (buffer && method == 8) {
 345                out = deflated = zlib_deflate_raw(buffer, size,
 346                                                  args->compression_level,
 347                                                  &compressed_size);
 348                if (!out || compressed_size >= size) {
 349                        out = buffer;
 350                        method = 0;
 351                        compressed_size = size;
 352                }
 353        }
 354
 355        copy_le16(extra.magic, 0x5455);
 356        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 357        extra.flags[0] = 1;     /* just mtime */
 358        copy_le32(extra.mtime, args->time);
 359
 360        /* make sure we have enough free space in the dictionary */
 361        direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
 362        while (zip_dir_size < zip_dir_offset + direntsize) {
 363                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 364                zip_dir = xrealloc(zip_dir, zip_dir_size);
 365        }
 366
 367        copy_le32(dirent.magic, 0x02014b50);
 368        copy_le16(dirent.creator_version, creator_version);
 369        copy_le16(dirent.version, 10);
 370        copy_le16(dirent.flags, flags);
 371        copy_le16(dirent.compression_method, method);
 372        copy_le16(dirent.mtime, zip_time);
 373        copy_le16(dirent.mdate, zip_date);
 374        set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 375        copy_le16(dirent.filename_length, pathlen);
 376        copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
 377        copy_le16(dirent.comment_length, 0);
 378        copy_le16(dirent.disk, 0);
 379        copy_le32(dirent.attr2, attr2);
 380        copy_le32(dirent.offset, zip_offset);
 381
 382        copy_le32(header.magic, 0x04034b50);
 383        copy_le16(header.version, 10);
 384        copy_le16(header.flags, flags);
 385        copy_le16(header.compression_method, method);
 386        copy_le16(header.mtime, zip_time);
 387        copy_le16(header.mdate, zip_date);
 388        set_zip_header_data_desc(&header, size, compressed_size, crc);
 389        copy_le16(header.filename_length, pathlen);
 390        copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
 391        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 392        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 393        write_or_die(1, path, pathlen);
 394        zip_offset += pathlen;
 395        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 396        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 397        if (stream && method == 0) {
 398                unsigned char buf[STREAM_BUFFER_SIZE];
 399                ssize_t readlen;
 400
 401                for (;;) {
 402                        readlen = read_istream(stream, buf, sizeof(buf));
 403                        if (readlen <= 0)
 404                                break;
 405                        crc = crc32(crc, buf, readlen);
 406                        if (is_binary == -1)
 407                                is_binary = entry_is_binary(path_without_prefix,
 408                                                            buf, readlen);
 409                        write_or_die(1, buf, readlen);
 410                }
 411                close_istream(stream);
 412                if (readlen)
 413                        return readlen;
 414
 415                compressed_size = size;
 416                zip_offset += compressed_size;
 417
 418                write_zip_data_desc(size, compressed_size, crc);
 419                zip_offset += ZIP_DATA_DESC_SIZE;
 420
 421                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 422        } else if (stream && method == 8) {
 423                unsigned char buf[STREAM_BUFFER_SIZE];
 424                ssize_t readlen;
 425                git_zstream zstream;
 426                int result;
 427                size_t out_len;
 428                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 429
 430                git_deflate_init_raw(&zstream, args->compression_level);
 431
 432                compressed_size = 0;
 433                zstream.next_out = compressed;
 434                zstream.avail_out = sizeof(compressed);
 435
 436                for (;;) {
 437                        readlen = read_istream(stream, buf, sizeof(buf));
 438                        if (readlen <= 0)
 439                                break;
 440                        crc = crc32(crc, buf, readlen);
 441                        if (is_binary == -1)
 442                                is_binary = entry_is_binary(path_without_prefix,
 443                                                            buf, readlen);
 444
 445                        zstream.next_in = buf;
 446                        zstream.avail_in = readlen;
 447                        result = git_deflate(&zstream, 0);
 448                        if (result != Z_OK)
 449                                die("deflate error (%d)", result);
 450                        out_len = zstream.next_out - compressed;
 451
 452                        if (out_len > 0) {
 453                                write_or_die(1, compressed, out_len);
 454                                compressed_size += out_len;
 455                                zstream.next_out = compressed;
 456                                zstream.avail_out = sizeof(compressed);
 457                        }
 458
 459                }
 460                close_istream(stream);
 461                if (readlen)
 462                        return readlen;
 463
 464                zstream.next_in = buf;
 465                zstream.avail_in = 0;
 466                result = git_deflate(&zstream, Z_FINISH);
 467                if (result != Z_STREAM_END)
 468                        die("deflate error (%d)", result);
 469
 470                git_deflate_end(&zstream);
 471                out_len = zstream.next_out - compressed;
 472                write_or_die(1, compressed, out_len);
 473                compressed_size += out_len;
 474                zip_offset += compressed_size;
 475
 476                write_zip_data_desc(size, compressed_size, crc);
 477                zip_offset += ZIP_DATA_DESC_SIZE;
 478
 479                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 480        } else if (compressed_size > 0) {
 481                write_or_die(1, out, compressed_size);
 482                zip_offset += compressed_size;
 483        }
 484
 485        free(deflated);
 486        free(buffer);
 487
 488        copy_le16(dirent.attr1, !is_binary);
 489
 490        memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 491        zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 492        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 493        zip_dir_offset += pathlen;
 494        memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
 495        zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
 496        zip_dir_entries++;
 497
 498        return 0;
 499}
 500
 501static void write_zip64_trailer(void)
 502{
 503        struct zip64_dir_trailer trailer64;
 504        struct zip64_dir_trailer_locator locator64;
 505
 506        copy_le32(trailer64.magic, 0x06064b50);
 507        copy_le64(trailer64.record_size, ZIP64_DIR_TRAILER_RECORD_SIZE);
 508        copy_le16(trailer64.creator_version, max_creator_version);
 509        copy_le16(trailer64.version, 45);
 510        copy_le32(trailer64.disk, 0);
 511        copy_le32(trailer64.directory_start_disk, 0);
 512        copy_le64(trailer64.entries_on_this_disk, zip_dir_entries);
 513        copy_le64(trailer64.entries, zip_dir_entries);
 514        copy_le64(trailer64.size, zip_dir_offset);
 515        copy_le64(trailer64.offset, zip_offset);
 516
 517        copy_le32(locator64.magic, 0x07064b50);
 518        copy_le32(locator64.disk, 0);
 519        copy_le64(locator64.offset, zip_offset + zip_dir_offset);
 520        copy_le32(locator64.number_of_disks, 1);
 521
 522        write_or_die(1, &trailer64, ZIP64_DIR_TRAILER_SIZE);
 523        write_or_die(1, &locator64, ZIP64_DIR_TRAILER_LOCATOR_SIZE);
 524}
 525
 526static void write_zip_trailer(const unsigned char *sha1)
 527{
 528        struct zip_dir_trailer trailer;
 529        int clamped = 0;
 530
 531        copy_le32(trailer.magic, 0x06054b50);
 532        copy_le16(trailer.disk, 0);
 533        copy_le16(trailer.directory_start_disk, 0);
 534        copy_le16_clamp(trailer.entries_on_this_disk, zip_dir_entries,
 535                        &clamped);
 536        copy_le16_clamp(trailer.entries, zip_dir_entries, &clamped);
 537        copy_le32(trailer.size, zip_dir_offset);
 538        copy_le32(trailer.offset, zip_offset);
 539        copy_le16(trailer.comment_length, sha1 ? GIT_SHA1_HEXSZ : 0);
 540
 541        write_or_die(1, zip_dir, zip_dir_offset);
 542        if (clamped)
 543                write_zip64_trailer();
 544        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 545        if (sha1)
 546                write_or_die(1, sha1_to_hex(sha1), GIT_SHA1_HEXSZ);
 547}
 548
 549static void dos_time(time_t *time, int *dos_date, int *dos_time)
 550{
 551        struct tm *t = localtime(time);
 552
 553        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 554                    (t->tm_year + 1900 - 1980) * 512;
 555        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 556}
 557
 558static int archive_zip_config(const char *var, const char *value, void *data)
 559{
 560        return userdiff_config(var, value);
 561}
 562
 563static int write_zip_archive(const struct archiver *ar,
 564                             struct archiver_args *args)
 565{
 566        int err;
 567
 568        git_config(archive_zip_config, NULL);
 569
 570        dos_time(&args->time, &zip_date, &zip_time);
 571
 572        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 573        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 574
 575        err = write_archive_entries(args, write_zip_entry);
 576        if (!err)
 577                write_zip_trailer(args->commit_sha1);
 578
 579        free(zip_dir);
 580
 581        return err;
 582}
 583
 584static struct archiver zip_archiver = {
 585        "zip",
 586        write_zip_archive,
 587        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 588};
 589
 590void init_zip_archiver(void)
 591{
 592        register_archiver(&zip_archiver);
 593}