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
   9static int zip_date;
  10static int zip_time;
  11
  12static unsigned char *zip_dir;
  13static unsigned int zip_dir_size;
  14
  15static unsigned int zip_offset;
  16static unsigned int zip_dir_offset;
  17static unsigned int zip_dir_entries;
  18
  19#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  20#define ZIP_STREAM      (1 <<  3)
  21#define ZIP_UTF8        (1 << 11)
  22
  23struct zip_local_header {
  24        unsigned char magic[4];
  25        unsigned char version[2];
  26        unsigned char flags[2];
  27        unsigned char compression_method[2];
  28        unsigned char mtime[2];
  29        unsigned char mdate[2];
  30        unsigned char crc32[4];
  31        unsigned char compressed_size[4];
  32        unsigned char size[4];
  33        unsigned char filename_length[2];
  34        unsigned char extra_length[2];
  35        unsigned char _end[1];
  36};
  37
  38struct zip_data_desc {
  39        unsigned char magic[4];
  40        unsigned char crc32[4];
  41        unsigned char compressed_size[4];
  42        unsigned char size[4];
  43        unsigned char _end[1];
  44};
  45
  46struct zip_dir_header {
  47        unsigned char magic[4];
  48        unsigned char creator_version[2];
  49        unsigned char version[2];
  50        unsigned char flags[2];
  51        unsigned char compression_method[2];
  52        unsigned char mtime[2];
  53        unsigned char mdate[2];
  54        unsigned char crc32[4];
  55        unsigned char compressed_size[4];
  56        unsigned char size[4];
  57        unsigned char filename_length[2];
  58        unsigned char extra_length[2];
  59        unsigned char comment_length[2];
  60        unsigned char disk[2];
  61        unsigned char attr1[2];
  62        unsigned char attr2[4];
  63        unsigned char offset[4];
  64        unsigned char _end[1];
  65};
  66
  67struct zip_dir_trailer {
  68        unsigned char magic[4];
  69        unsigned char disk[2];
  70        unsigned char directory_start_disk[2];
  71        unsigned char entries_on_this_disk[2];
  72        unsigned char entries[2];
  73        unsigned char size[4];
  74        unsigned char offset[4];
  75        unsigned char comment_length[2];
  76        unsigned char _end[1];
  77};
  78
  79struct zip_extra_mtime {
  80        unsigned char magic[2];
  81        unsigned char extra_size[2];
  82        unsigned char flags[1];
  83        unsigned char mtime[4];
  84        unsigned char _end[1];
  85};
  86
  87/*
  88 * On ARM, padding is added at the end of the struct, so a simple
  89 * sizeof(struct ...) reports two bytes more than the payload size
  90 * we're interested in.
  91 */
  92#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
  93#define ZIP_DATA_DESC_SIZE      offsetof(struct zip_data_desc, _end)
  94#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
  95#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
  96#define ZIP_EXTRA_MTIME_SIZE    offsetof(struct zip_extra_mtime, _end)
  97#define ZIP_EXTRA_MTIME_PAYLOAD_SIZE \
  98        (ZIP_EXTRA_MTIME_SIZE - offsetof(struct zip_extra_mtime, flags))
  99
 100static void copy_le16(unsigned char *dest, unsigned int n)
 101{
 102        dest[0] = 0xff & n;
 103        dest[1] = 0xff & (n >> 010);
 104}
 105
 106static void copy_le32(unsigned char *dest, unsigned int n)
 107{
 108        dest[0] = 0xff & n;
 109        dest[1] = 0xff & (n >> 010);
 110        dest[2] = 0xff & (n >> 020);
 111        dest[3] = 0xff & (n >> 030);
 112}
 113
 114static void *zlib_deflate(void *data, unsigned long size,
 115                int compression_level, unsigned long *compressed_size)
 116{
 117        git_zstream stream;
 118        unsigned long maxsize;
 119        void *buffer;
 120        int result;
 121
 122        memset(&stream, 0, sizeof(stream));
 123        git_deflate_init(&stream, compression_level);
 124        maxsize = git_deflate_bound(&stream, size);
 125        buffer = xmalloc(maxsize);
 126
 127        stream.next_in = data;
 128        stream.avail_in = size;
 129        stream.next_out = buffer;
 130        stream.avail_out = maxsize;
 131
 132        do {
 133                result = git_deflate(&stream, Z_FINISH);
 134        } while (result == Z_OK);
 135
 136        if (result != Z_STREAM_END) {
 137                free(buffer);
 138                return NULL;
 139        }
 140
 141        git_deflate_end(&stream);
 142        *compressed_size = stream.total_out;
 143
 144        return buffer;
 145}
 146
 147static void write_zip_data_desc(unsigned long size,
 148                                unsigned long compressed_size,
 149                                unsigned long crc)
 150{
 151        struct zip_data_desc trailer;
 152
 153        copy_le32(trailer.magic, 0x08074b50);
 154        copy_le32(trailer.crc32, crc);
 155        copy_le32(trailer.compressed_size, compressed_size);
 156        copy_le32(trailer.size, size);
 157        write_or_die(1, &trailer, ZIP_DATA_DESC_SIZE);
 158}
 159
 160static void set_zip_dir_data_desc(struct zip_dir_header *header,
 161                                  unsigned long size,
 162                                  unsigned long compressed_size,
 163                                  unsigned long crc)
 164{
 165        copy_le32(header->crc32, crc);
 166        copy_le32(header->compressed_size, compressed_size);
 167        copy_le32(header->size, size);
 168}
 169
 170static void set_zip_header_data_desc(struct zip_local_header *header,
 171                                     unsigned long size,
 172                                     unsigned long compressed_size,
 173                                     unsigned long crc)
 174{
 175        copy_le32(header->crc32, crc);
 176        copy_le32(header->compressed_size, compressed_size);
 177        copy_le32(header->size, size);
 178}
 179
 180static int has_only_ascii(const char *s)
 181{
 182        for (;;) {
 183                int c = *s++;
 184                if (c == '\0')
 185                        return 1;
 186                if (!isascii(c))
 187                        return 0;
 188        }
 189}
 190
 191#define STREAM_BUFFER_SIZE (1024 * 16)
 192
 193static int write_zip_entry(struct archiver_args *args,
 194                           const unsigned char *sha1,
 195                           const char *path, size_t pathlen,
 196                           unsigned int mode)
 197{
 198        struct zip_local_header header;
 199        struct zip_dir_header dirent;
 200        struct zip_extra_mtime extra;
 201        unsigned long attr2;
 202        unsigned long compressed_size;
 203        unsigned long crc;
 204        unsigned long direntsize;
 205        int method;
 206        unsigned char *out;
 207        void *deflated = NULL;
 208        void *buffer;
 209        struct git_istream *stream = NULL;
 210        unsigned long flags = 0;
 211        unsigned long size;
 212
 213        crc = crc32(0, NULL, 0);
 214
 215        if (!has_only_ascii(path)) {
 216                if (is_utf8(path))
 217                        flags |= ZIP_UTF8;
 218                else
 219                        warning("Path is not valid UTF-8: %s", path);
 220        }
 221
 222        if (pathlen > 0xffff) {
 223                return error("path too long (%d chars, SHA1: %s): %s",
 224                                (int)pathlen, sha1_to_hex(sha1), path);
 225        }
 226
 227        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 228                method = 0;
 229                attr2 = 16;
 230                out = NULL;
 231                size = 0;
 232                compressed_size = 0;
 233                buffer = NULL;
 234                size = 0;
 235        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 236                enum object_type type = sha1_object_info(sha1, &size);
 237
 238                method = 0;
 239                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 240                        (mode & 0111) ? ((mode) << 16) : 0;
 241                if (S_ISREG(mode) && args->compression_level != 0 && size > 0)
 242                        method = 8;
 243
 244                if (S_ISREG(mode) && type == OBJ_BLOB && !args->convert &&
 245                    size > big_file_threshold) {
 246                        stream = open_istream(sha1, &type, &size, NULL);
 247                        if (!stream)
 248                                return error("cannot stream blob %s",
 249                                             sha1_to_hex(sha1));
 250                        flags |= ZIP_STREAM;
 251                        out = buffer = NULL;
 252                } else {
 253                        buffer = sha1_file_to_archive(args, path, sha1, mode,
 254                                                      &type, &size);
 255                        if (!buffer)
 256                                return error("cannot read %s",
 257                                             sha1_to_hex(sha1));
 258                        crc = crc32(crc, buffer, size);
 259                        out = buffer;
 260                }
 261                compressed_size = (method == 0) ? size : 0;
 262        } else {
 263                return error("unsupported file mode: 0%o (SHA1: %s)", mode,
 264                                sha1_to_hex(sha1));
 265        }
 266
 267        if (buffer && method == 8) {
 268                deflated = zlib_deflate(buffer, size, args->compression_level,
 269                                &compressed_size);
 270                if (deflated && compressed_size - 6 < size) {
 271                        /* ZLIB --> raw compressed data (see RFC 1950) */
 272                        /* CMF and FLG ... */
 273                        out = (unsigned char *)deflated + 2;
 274                        compressed_size -= 6;   /* ... and ADLER32 */
 275                } else {
 276                        method = 0;
 277                        compressed_size = size;
 278                }
 279        }
 280
 281        copy_le16(extra.magic, 0x5455);
 282        copy_le16(extra.extra_size, ZIP_EXTRA_MTIME_PAYLOAD_SIZE);
 283        extra.flags[0] = 1;     /* just mtime */
 284        copy_le32(extra.mtime, args->time);
 285
 286        /* make sure we have enough free space in the dictionary */
 287        direntsize = ZIP_DIR_HEADER_SIZE + pathlen + ZIP_EXTRA_MTIME_SIZE;
 288        while (zip_dir_size < zip_dir_offset + direntsize) {
 289                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 290                zip_dir = xrealloc(zip_dir, zip_dir_size);
 291        }
 292
 293        copy_le32(dirent.magic, 0x02014b50);
 294        copy_le16(dirent.creator_version,
 295                S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
 296        copy_le16(dirent.version, 10);
 297        copy_le16(dirent.flags, flags);
 298        copy_le16(dirent.compression_method, method);
 299        copy_le16(dirent.mtime, zip_time);
 300        copy_le16(dirent.mdate, zip_date);
 301        set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 302        copy_le16(dirent.filename_length, pathlen);
 303        copy_le16(dirent.extra_length, ZIP_EXTRA_MTIME_SIZE);
 304        copy_le16(dirent.comment_length, 0);
 305        copy_le16(dirent.disk, 0);
 306        copy_le16(dirent.attr1, 0);
 307        copy_le32(dirent.attr2, attr2);
 308        copy_le32(dirent.offset, zip_offset);
 309
 310        copy_le32(header.magic, 0x04034b50);
 311        copy_le16(header.version, 10);
 312        copy_le16(header.flags, flags);
 313        copy_le16(header.compression_method, method);
 314        copy_le16(header.mtime, zip_time);
 315        copy_le16(header.mdate, zip_date);
 316        set_zip_header_data_desc(&header, size, compressed_size, crc);
 317        copy_le16(header.filename_length, pathlen);
 318        copy_le16(header.extra_length, ZIP_EXTRA_MTIME_SIZE);
 319        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 320        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 321        write_or_die(1, path, pathlen);
 322        zip_offset += pathlen;
 323        write_or_die(1, &extra, ZIP_EXTRA_MTIME_SIZE);
 324        zip_offset += ZIP_EXTRA_MTIME_SIZE;
 325        if (stream && method == 0) {
 326                unsigned char buf[STREAM_BUFFER_SIZE];
 327                ssize_t readlen;
 328
 329                for (;;) {
 330                        readlen = read_istream(stream, buf, sizeof(buf));
 331                        if (readlen <= 0)
 332                                break;
 333                        crc = crc32(crc, buf, readlen);
 334                        write_or_die(1, buf, readlen);
 335                }
 336                close_istream(stream);
 337                if (readlen)
 338                        return readlen;
 339
 340                compressed_size = size;
 341                zip_offset += compressed_size;
 342
 343                write_zip_data_desc(size, compressed_size, crc);
 344                zip_offset += ZIP_DATA_DESC_SIZE;
 345
 346                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 347        } else if (stream && method == 8) {
 348                unsigned char buf[STREAM_BUFFER_SIZE];
 349                ssize_t readlen;
 350                git_zstream zstream;
 351                int result;
 352                size_t out_len;
 353                unsigned char compressed[STREAM_BUFFER_SIZE * 2];
 354
 355                memset(&zstream, 0, sizeof(zstream));
 356                git_deflate_init(&zstream, args->compression_level);
 357
 358                compressed_size = 0;
 359                zstream.next_out = compressed;
 360                zstream.avail_out = sizeof(compressed);
 361
 362                for (;;) {
 363                        readlen = read_istream(stream, buf, sizeof(buf));
 364                        if (readlen <= 0)
 365                                break;
 366                        crc = crc32(crc, buf, readlen);
 367
 368                        zstream.next_in = buf;
 369                        zstream.avail_in = readlen;
 370                        result = git_deflate(&zstream, 0);
 371                        if (result != Z_OK)
 372                                die("deflate error (%d)", result);
 373                        out = compressed;
 374                        if (!compressed_size)
 375                                out += 2;
 376                        out_len = zstream.next_out - out;
 377
 378                        if (out_len > 0) {
 379                                write_or_die(1, out, out_len);
 380                                compressed_size += out_len;
 381                                zstream.next_out = compressed;
 382                                zstream.avail_out = sizeof(compressed);
 383                        }
 384
 385                }
 386                close_istream(stream);
 387                if (readlen)
 388                        return readlen;
 389
 390                zstream.next_in = buf;
 391                zstream.avail_in = 0;
 392                result = git_deflate(&zstream, Z_FINISH);
 393                if (result != Z_STREAM_END)
 394                        die("deflate error (%d)", result);
 395
 396                git_deflate_end(&zstream);
 397                out = compressed;
 398                if (!compressed_size)
 399                        out += 2;
 400                out_len = zstream.next_out - out - 4;
 401                write_or_die(1, out, out_len);
 402                compressed_size += out_len;
 403                zip_offset += compressed_size;
 404
 405                write_zip_data_desc(size, compressed_size, crc);
 406                zip_offset += ZIP_DATA_DESC_SIZE;
 407
 408                set_zip_dir_data_desc(&dirent, size, compressed_size, crc);
 409        } else if (compressed_size > 0) {
 410                write_or_die(1, out, compressed_size);
 411                zip_offset += compressed_size;
 412        }
 413
 414        free(deflated);
 415        free(buffer);
 416
 417        memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 418        zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 419        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 420        zip_dir_offset += pathlen;
 421        memcpy(zip_dir + zip_dir_offset, &extra, ZIP_EXTRA_MTIME_SIZE);
 422        zip_dir_offset += ZIP_EXTRA_MTIME_SIZE;
 423        zip_dir_entries++;
 424
 425        return 0;
 426}
 427
 428static void write_zip_trailer(const unsigned char *sha1)
 429{
 430        struct zip_dir_trailer trailer;
 431
 432        copy_le32(trailer.magic, 0x06054b50);
 433        copy_le16(trailer.disk, 0);
 434        copy_le16(trailer.directory_start_disk, 0);
 435        copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
 436        copy_le16(trailer.entries, zip_dir_entries);
 437        copy_le32(trailer.size, zip_dir_offset);
 438        copy_le32(trailer.offset, zip_offset);
 439        copy_le16(trailer.comment_length, sha1 ? 40 : 0);
 440
 441        write_or_die(1, zip_dir, zip_dir_offset);
 442        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 443        if (sha1)
 444                write_or_die(1, sha1_to_hex(sha1), 40);
 445}
 446
 447static void dos_time(time_t *time, int *dos_date, int *dos_time)
 448{
 449        struct tm *t = localtime(time);
 450
 451        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 452                    (t->tm_year + 1900 - 1980) * 512;
 453        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 454}
 455
 456static int write_zip_archive(const struct archiver *ar,
 457                             struct archiver_args *args)
 458{
 459        int err;
 460
 461        dos_time(&args->time, &zip_date, &zip_time);
 462
 463        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 464        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 465
 466        err = write_archive_entries(args, write_zip_entry);
 467        if (!err)
 468                write_zip_trailer(args->commit_sha1);
 469
 470        free(zip_dir);
 471
 472        return err;
 473}
 474
 475static struct archiver zip_archiver = {
 476        "zip",
 477        write_zip_archive,
 478        ARCHIVER_WANT_COMPRESSION_LEVELS|ARCHIVER_REMOTE
 479};
 480
 481void init_zip_archiver(void)
 482{
 483        register_archiver(&zip_archiver);
 484}