Andrew's git - gitweb.git/blob

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include "cache.h"
   5#include "commit.h"
   6#include "blob.h"
   7#include "tree.h"
   8#include "quote.h"
   9#include "builtin.h"
  10#include "archive.h"
  11
  12static int verbose;
  13static int zip_date;
  14static int zip_time;
  15static const struct commit *commit;
  16static size_t base_len;
  17
  18static unsigned char *zip_dir;
  19static unsigned int zip_dir_size;
  20
  21static unsigned int zip_offset;
  22static unsigned int zip_dir_offset;
  23static unsigned int zip_dir_entries;
  24
  25#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  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_dir_header {
  43        unsigned char magic[4];
  44        unsigned char creator_version[2];
  45        unsigned char version[2];
  46        unsigned char flags[2];
  47        unsigned char compression_method[2];
  48        unsigned char mtime[2];
  49        unsigned char mdate[2];
  50        unsigned char crc32[4];
  51        unsigned char compressed_size[4];
  52        unsigned char size[4];
  53        unsigned char filename_length[2];
  54        unsigned char extra_length[2];
  55        unsigned char comment_length[2];
  56        unsigned char disk[2];
  57        unsigned char attr1[2];
  58        unsigned char attr2[4];
  59        unsigned char offset[4];
  60        unsigned char _end[1];
  61};
  62
  63struct zip_dir_trailer {
  64        unsigned char magic[4];
  65        unsigned char disk[2];
  66        unsigned char directory_start_disk[2];
  67        unsigned char entries_on_this_disk[2];
  68        unsigned char entries[2];
  69        unsigned char size[4];
  70        unsigned char offset[4];
  71        unsigned char comment_length[2];
  72        unsigned char _end[1];
  73};
  74
  75/*
  76 * On ARM, padding is added at the end of the struct, so a simple
  77 * sizeof(struct ...) reports two bytes more than the payload size
  78 * we're interested in.
  79 */
  80#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
  81#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
  82#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
  83
  84static void copy_le16(unsigned char *dest, unsigned int n)
  85{
  86        dest[0] = 0xff & n;
  87        dest[1] = 0xff & (n >> 010);
  88}
  89
  90static void copy_le32(unsigned char *dest, unsigned int n)
  91{
  92        dest[0] = 0xff & n;
  93        dest[1] = 0xff & (n >> 010);
  94        dest[2] = 0xff & (n >> 020);
  95        dest[3] = 0xff & (n >> 030);
  96}
  97
  98static void *zlib_deflate(void *data, unsigned long size,
  99                          unsigned long *compressed_size)
 100{
 101        z_stream stream;
 102        unsigned long maxsize;
 103        void *buffer;
 104        int result;
 105
 106        memset(&stream, 0, sizeof(stream));
 107        deflateInit(&stream, zlib_compression_level);
 108        maxsize = deflateBound(&stream, size);
 109        buffer = xmalloc(maxsize);
 110
 111        stream.next_in = data;
 112        stream.avail_in = size;
 113        stream.next_out = buffer;
 114        stream.avail_out = maxsize;
 115
 116        do {
 117                result = deflate(&stream, Z_FINISH);
 118        } while (result == Z_OK);
 119
 120        if (result != Z_STREAM_END) {
 121                free(buffer);
 122                return NULL;
 123        }
 124
 125        deflateEnd(&stream);
 126        *compressed_size = stream.total_out;
 127
 128        return buffer;
 129}
 130
 131static char *construct_path(const char *base, int baselen,
 132                            const char *filename, int isdir, int *pathlen)
 133{
 134        int filenamelen = strlen(filename);
 135        int len = baselen + filenamelen;
 136        char *path, *p;
 137
 138        if (isdir)
 139                len++;
 140        p = path = xmalloc(len + 1);
 141
 142        memcpy(p, base, baselen);
 143        p += baselen;
 144        memcpy(p, filename, filenamelen);
 145        p += filenamelen;
 146        if (isdir)
 147                *p++ = '/';
 148        *p = '\0';
 149
 150        *pathlen = len;
 151
 152        return path;
 153}
 154
 155static int write_zip_entry(const unsigned char *sha1,
 156                           const char *base, int baselen,
 157                           const char *filename, unsigned mode, int stage)
 158{
 159        struct zip_local_header header;
 160        struct zip_dir_header dirent;
 161        unsigned long attr2;
 162        unsigned long compressed_size;
 163        unsigned long uncompressed_size;
 164        unsigned long crc;
 165        unsigned long direntsize;
 166        unsigned long size;
 167        int method;
 168        int result = -1;
 169        int pathlen;
 170        unsigned char *out;
 171        char *path;
 172        enum object_type type;
 173        void *buffer = NULL;
 174        void *deflated = NULL;
 175
 176        crc = crc32(0, NULL, 0);
 177
 178        path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
 179        if (verbose)
 180                fprintf(stderr, "%s\n", path);
 181        if (pathlen > 0xffff) {
 182                error("path too long (%d chars, SHA1: %s): %s", pathlen,
 183                      sha1_to_hex(sha1), path);
 184                goto out;
 185        }
 186
 187        if (S_ISDIR(mode) || S_ISGITLINK(mode)) {
 188                method = 0;
 189                attr2 = 16;
 190                result = (S_ISDIR(mode) ? READ_TREE_RECURSIVE : 0);
 191                out = NULL;
 192                uncompressed_size = 0;
 193                compressed_size = 0;
 194        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 195                method = 0;
 196                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) :
 197                        (mode & 0111) ? ((mode) << 16) : 0;
 198                if (S_ISREG(mode) && zlib_compression_level != 0)
 199                        method = 8;
 200                result = 0;
 201                buffer = sha1_file_to_archive(path + base_len, sha1, mode,
 202                                &type, &size, commit);
 203                if (!buffer)
 204                        die("cannot read %s", sha1_to_hex(sha1));
 205                crc = crc32(crc, buffer, size);
 206                out = buffer;
 207                uncompressed_size = size;
 208                compressed_size = size;
 209        } else {
 210                error("unsupported file mode: 0%o (SHA1: %s)", mode,
 211                      sha1_to_hex(sha1));
 212                goto out;
 213        }
 214
 215        if (method == 8) {
 216                deflated = zlib_deflate(buffer, size, &compressed_size);
 217                if (deflated && compressed_size - 6 < size) {
 218                        /* ZLIB --> raw compressed data (see RFC 1950) */
 219                        /* CMF and FLG ... */
 220                        out = (unsigned char *)deflated + 2;
 221                        compressed_size -= 6;   /* ... and ADLER32 */
 222                } else {
 223                        method = 0;
 224                        compressed_size = size;
 225                }
 226        }
 227
 228        /* make sure we have enough free space in the dictionary */
 229        direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
 230        while (zip_dir_size < zip_dir_offset + direntsize) {
 231                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 232                zip_dir = xrealloc(zip_dir, zip_dir_size);
 233        }
 234
 235        copy_le32(dirent.magic, 0x02014b50);
 236        copy_le16(dirent.creator_version,
 237                S_ISLNK(mode) || (S_ISREG(mode) && (mode & 0111)) ? 0x0317 : 0);
 238        copy_le16(dirent.version, 10);
 239        copy_le16(dirent.flags, 0);
 240        copy_le16(dirent.compression_method, method);
 241        copy_le16(dirent.mtime, zip_time);
 242        copy_le16(dirent.mdate, zip_date);
 243        copy_le32(dirent.crc32, crc);
 244        copy_le32(dirent.compressed_size, compressed_size);
 245        copy_le32(dirent.size, uncompressed_size);
 246        copy_le16(dirent.filename_length, pathlen);
 247        copy_le16(dirent.extra_length, 0);
 248        copy_le16(dirent.comment_length, 0);
 249        copy_le16(dirent.disk, 0);
 250        copy_le16(dirent.attr1, 0);
 251        copy_le32(dirent.attr2, attr2);
 252        copy_le32(dirent.offset, zip_offset);
 253        memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 254        zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 255        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 256        zip_dir_offset += pathlen;
 257        zip_dir_entries++;
 258
 259        copy_le32(header.magic, 0x04034b50);
 260        copy_le16(header.version, 10);
 261        copy_le16(header.flags, 0);
 262        copy_le16(header.compression_method, method);
 263        copy_le16(header.mtime, zip_time);
 264        copy_le16(header.mdate, zip_date);
 265        copy_le32(header.crc32, crc);
 266        copy_le32(header.compressed_size, compressed_size);
 267        copy_le32(header.size, uncompressed_size);
 268        copy_le16(header.filename_length, pathlen);
 269        copy_le16(header.extra_length, 0);
 270        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 271        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 272        write_or_die(1, path, pathlen);
 273        zip_offset += pathlen;
 274        if (compressed_size > 0) {
 275                write_or_die(1, out, compressed_size);
 276                zip_offset += compressed_size;
 277        }
 278
 279out:
 280        free(buffer);
 281        free(deflated);
 282        free(path);
 283
 284        return result;
 285}
 286
 287static void write_zip_trailer(const unsigned char *sha1)
 288{
 289        struct zip_dir_trailer trailer;
 290
 291        copy_le32(trailer.magic, 0x06054b50);
 292        copy_le16(trailer.disk, 0);
 293        copy_le16(trailer.directory_start_disk, 0);
 294        copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
 295        copy_le16(trailer.entries, zip_dir_entries);
 296        copy_le32(trailer.size, zip_dir_offset);
 297        copy_le32(trailer.offset, zip_offset);
 298        copy_le16(trailer.comment_length, sha1 ? 40 : 0);
 299
 300        write_or_die(1, zip_dir, zip_dir_offset);
 301        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 302        if (sha1)
 303                write_or_die(1, sha1_to_hex(sha1), 40);
 304}
 305
 306static void dos_time(time_t *time, int *dos_date, int *dos_time)
 307{
 308        struct tm *t = localtime(time);
 309
 310        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 311                    (t->tm_year + 1900 - 1980) * 512;
 312        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 313}
 314
 315int write_zip_archive(struct archiver_args *args)
 316{
 317        int plen = strlen(args->base);
 318
 319        dos_time(&args->time, &zip_date, &zip_time);
 320
 321        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 322        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 323        verbose = args->verbose;
 324        commit = args->commit;
 325        base_len = args->base ? strlen(args->base) : 0;
 326
 327        if (args->base && plen > 0 && args->base[plen - 1] == '/') {
 328                char *base = xstrdup(args->base);
 329                int baselen = strlen(base);
 330
 331                while (baselen > 0 && base[baselen - 1] == '/')
 332                        base[--baselen] = '\0';
 333                write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
 334                free(base);
 335        }
 336        read_tree_recursive(args->tree, args->base, plen, 0,
 337                            args->pathspec, write_zip_entry);
 338        write_zip_trailer(args->commit_sha1);
 339
 340        free(zip_dir);
 341
 342        return 0;
 343}
 344
 345void *parse_extra_zip_args(int argc, const char **argv)
 346{
 347        for (; argc > 0; argc--, argv++) {
 348                const char *arg = argv[0];
 349
 350                if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
 351                        zlib_compression_level = arg[1] - '0';
 352                else
 353                        die("Unknown argument for zip format: %s", arg);
 354        }
 355        return NULL;
 356}