Andrew's git - gitweb.git/blob - builtin-zip-tree.c

   1/*
   2 * Copyright (c) 2006 Rene Scharfe
   3 */
   4#include <time.h>
   5#include "cache.h"
   6#include "commit.h"
   7#include "blob.h"
   8#include "tree.h"
   9#include "quote.h"
  10#include "builtin.h"
  11#include "archive.h"
  12
  13static const char zip_tree_usage[] =
  14"git-zip-tree [-0|...|-9] <tree-ish> [ <base> ]";
  15
  16static int verbose;
  17static int zip_date;
  18static int zip_time;
  19
  20static unsigned char *zip_dir;
  21static unsigned int zip_dir_size;
  22
  23static unsigned int zip_offset;
  24static unsigned int zip_dir_offset;
  25static unsigned int zip_dir_entries;
  26
  27#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  28
  29struct zip_local_header {
  30        unsigned char magic[4];
  31        unsigned char version[2];
  32        unsigned char flags[2];
  33        unsigned char compression_method[2];
  34        unsigned char mtime[2];
  35        unsigned char mdate[2];
  36        unsigned char crc32[4];
  37        unsigned char compressed_size[4];
  38        unsigned char size[4];
  39        unsigned char filename_length[2];
  40        unsigned char extra_length[2];
  41};
  42
  43struct zip_dir_header {
  44        unsigned char magic[4];
  45        unsigned char creator_version[2];
  46        unsigned char version[2];
  47        unsigned char flags[2];
  48        unsigned char compression_method[2];
  49        unsigned char mtime[2];
  50        unsigned char mdate[2];
  51        unsigned char crc32[4];
  52        unsigned char compressed_size[4];
  53        unsigned char size[4];
  54        unsigned char filename_length[2];
  55        unsigned char extra_length[2];
  56        unsigned char comment_length[2];
  57        unsigned char disk[2];
  58        unsigned char attr1[2];
  59        unsigned char attr2[4];
  60        unsigned char offset[4];
  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};
  73
  74static void copy_le16(unsigned char *dest, unsigned int n)
  75{
  76        dest[0] = 0xff & n;
  77        dest[1] = 0xff & (n >> 010);
  78}
  79
  80static void copy_le32(unsigned char *dest, unsigned int n)
  81{
  82        dest[0] = 0xff & n;
  83        dest[1] = 0xff & (n >> 010);
  84        dest[2] = 0xff & (n >> 020);
  85        dest[3] = 0xff & (n >> 030);
  86}
  87
  88static void *zlib_deflate(void *data, unsigned long size,
  89                          unsigned long *compressed_size)
  90{
  91        z_stream stream;
  92        unsigned long maxsize;
  93        void *buffer;
  94        int result;
  95
  96        memset(&stream, 0, sizeof(stream));
  97        deflateInit(&stream, zlib_compression_level);
  98        maxsize = deflateBound(&stream, size);
  99        buffer = xmalloc(maxsize);
 100
 101        stream.next_in = data;
 102        stream.avail_in = size;
 103        stream.next_out = buffer;
 104        stream.avail_out = maxsize;
 105
 106        do {
 107                result = deflate(&stream, Z_FINISH);
 108        } while (result == Z_OK);
 109
 110        if (result != Z_STREAM_END) {
 111                free(buffer);
 112                return NULL;
 113        }
 114
 115        deflateEnd(&stream);
 116        *compressed_size = stream.total_out;
 117
 118        return buffer;
 119}
 120
 121static char *construct_path(const char *base, int baselen,
 122                            const char *filename, int isdir, int *pathlen)
 123{
 124        int filenamelen = strlen(filename);
 125        int len = baselen + filenamelen;
 126        char *path, *p;
 127
 128        if (isdir)
 129                len++;
 130        p = path = xmalloc(len + 1);
 131
 132        memcpy(p, base, baselen);
 133        p += baselen;
 134        memcpy(p, filename, filenamelen);
 135        p += filenamelen;
 136        if (isdir)
 137                *p++ = '/';
 138        *p = '\0';
 139
 140        *pathlen = len;
 141
 142        return path;
 143}
 144
 145static int write_zip_entry(const unsigned char *sha1,
 146                           const char *base, int baselen,
 147                           const char *filename, unsigned mode, int stage)
 148{
 149        struct zip_local_header header;
 150        struct zip_dir_header dirent;
 151        unsigned long compressed_size;
 152        unsigned long uncompressed_size;
 153        unsigned long crc;
 154        unsigned long direntsize;
 155        unsigned long size;
 156        int method;
 157        int result = -1;
 158        int pathlen;
 159        unsigned char *out;
 160        char *path;
 161        char type[20];
 162        void *buffer = NULL;
 163        void *deflated = NULL;
 164
 165        crc = crc32(0, Z_NULL, 0);
 166
 167        path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
 168        if (verbose)
 169                fprintf(stderr, "%s\n", path);
 170        if (pathlen > 0xffff) {
 171                error("path too long (%d chars, SHA1: %s): %s", pathlen,
 172                      sha1_to_hex(sha1), path);
 173                goto out;
 174        }
 175
 176        if (S_ISDIR(mode)) {
 177                method = 0;
 178                result = READ_TREE_RECURSIVE;
 179                out = NULL;
 180                uncompressed_size = 0;
 181                compressed_size = 0;
 182        } else if (S_ISREG(mode)) {
 183                method = zlib_compression_level == 0 ? 0 : 8;
 184                result = 0;
 185                buffer = read_sha1_file(sha1, type, &size);
 186                if (!buffer)
 187                        die("cannot read %s", sha1_to_hex(sha1));
 188                crc = crc32(crc, buffer, size);
 189                out = buffer;
 190                uncompressed_size = size;
 191                compressed_size = size;
 192        } else {
 193                error("unsupported file mode: 0%o (SHA1: %s)", mode,
 194                      sha1_to_hex(sha1));
 195                goto out;
 196        }
 197
 198        if (method == 8) {
 199                deflated = zlib_deflate(buffer, size, &compressed_size);
 200                if (deflated && compressed_size - 6 < size) {
 201                        /* ZLIB --> raw compressed data (see RFC 1950) */
 202                        /* CMF and FLG ... */
 203                        out = (unsigned char *)deflated + 2;
 204                        compressed_size -= 6;   /* ... and ADLER32 */
 205                } else {
 206                        method = 0;
 207                        compressed_size = size;
 208                }
 209        }
 210
 211        /* make sure we have enough free space in the dictionary */
 212        direntsize = sizeof(struct zip_dir_header) + pathlen;
 213        while (zip_dir_size < zip_dir_offset + direntsize) {
 214                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 215                zip_dir = xrealloc(zip_dir, zip_dir_size);
 216        }
 217
 218        copy_le32(dirent.magic, 0x02014b50);
 219        copy_le16(dirent.creator_version, 0);
 220        copy_le16(dirent.version, 20);
 221        copy_le16(dirent.flags, 0);
 222        copy_le16(dirent.compression_method, method);
 223        copy_le16(dirent.mtime, zip_time);
 224        copy_le16(dirent.mdate, zip_date);
 225        copy_le32(dirent.crc32, crc);
 226        copy_le32(dirent.compressed_size, compressed_size);
 227        copy_le32(dirent.size, uncompressed_size);
 228        copy_le16(dirent.filename_length, pathlen);
 229        copy_le16(dirent.extra_length, 0);
 230        copy_le16(dirent.comment_length, 0);
 231        copy_le16(dirent.disk, 0);
 232        copy_le16(dirent.attr1, 0);
 233        copy_le32(dirent.attr2, 0);
 234        copy_le32(dirent.offset, zip_offset);
 235        memcpy(zip_dir + zip_dir_offset, &dirent, sizeof(struct zip_dir_header));
 236        zip_dir_offset += sizeof(struct zip_dir_header);
 237        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 238        zip_dir_offset += pathlen;
 239        zip_dir_entries++;
 240
 241        copy_le32(header.magic, 0x04034b50);
 242        copy_le16(header.version, 20);
 243        copy_le16(header.flags, 0);
 244        copy_le16(header.compression_method, method);
 245        copy_le16(header.mtime, zip_time);
 246        copy_le16(header.mdate, zip_date);
 247        copy_le32(header.crc32, crc);
 248        copy_le32(header.compressed_size, compressed_size);
 249        copy_le32(header.size, uncompressed_size);
 250        copy_le16(header.filename_length, pathlen);
 251        copy_le16(header.extra_length, 0);
 252        write_or_die(1, &header, sizeof(struct zip_local_header));
 253        zip_offset += sizeof(struct zip_local_header);
 254        write_or_die(1, path, pathlen);
 255        zip_offset += pathlen;
 256        if (compressed_size > 0) {
 257                write_or_die(1, out, compressed_size);
 258                zip_offset += compressed_size;
 259        }
 260
 261out:
 262        free(buffer);
 263        free(deflated);
 264        free(path);
 265
 266        return result;
 267}
 268
 269static void write_zip_trailer(const unsigned char *sha1)
 270{
 271        struct zip_dir_trailer trailer;
 272
 273        copy_le32(trailer.magic, 0x06054b50);
 274        copy_le16(trailer.disk, 0);
 275        copy_le16(trailer.directory_start_disk, 0);
 276        copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
 277        copy_le16(trailer.entries, zip_dir_entries);
 278        copy_le32(trailer.size, zip_dir_offset);
 279        copy_le32(trailer.offset, zip_offset);
 280        copy_le16(trailer.comment_length, sha1 ? 40 : 0);
 281
 282        write_or_die(1, zip_dir, zip_dir_offset);
 283        write_or_die(1, &trailer, sizeof(struct zip_dir_trailer));
 284        if (sha1)
 285                write_or_die(1, sha1_to_hex(sha1), 40);
 286}
 287
 288static void dos_time(time_t *time, int *dos_date, int *dos_time)
 289{
 290        struct tm *t = localtime(time);
 291
 292        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 293                    (t->tm_year + 1900 - 1980) * 512;
 294        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 295}
 296
 297int cmd_zip_tree(int argc, const char **argv, const char *prefix)
 298{
 299        unsigned char sha1[20];
 300        struct tree *tree;
 301        struct commit *commit;
 302        time_t archive_time;
 303        char *base;
 304        int baselen;
 305
 306        git_config(git_default_config);
 307
 308        if (argc > 1 && argv[1][0] == '-') {
 309                if (isdigit(argv[1][1]) && argv[1][2] == '\0') {
 310                        zlib_compression_level = argv[1][1] - '0';
 311                        argc--;
 312                        argv++;
 313                }
 314        }
 315
 316        switch (argc) {
 317        case 3:
 318                base = xstrdup(argv[2]);
 319                baselen = strlen(base);
 320                break;
 321        case 2:
 322                base = xstrdup("");
 323                baselen = 0;
 324                break;
 325        default:
 326                usage(zip_tree_usage);
 327        }
 328
 329        if (get_sha1(argv[1], sha1))
 330                die("Not a valid object name %s", argv[1]);
 331
 332        commit = lookup_commit_reference_gently(sha1, 1);
 333        archive_time = commit ? commit->date : time(NULL);
 334        dos_time(&archive_time, &zip_date, &zip_time);
 335
 336        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 337        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 338
 339        tree = parse_tree_indirect(sha1);
 340        if (!tree)
 341                die("not a tree object");
 342
 343        if (baselen > 0) {
 344                write_zip_entry(tree->object.sha1, "", 0, base, 040777, 0);
 345                base = xrealloc(base, baselen + 1);
 346                base[baselen] = '/';
 347                baselen++;
 348                base[baselen] = '\0';
 349        }
 350        read_tree_recursive(tree, base, baselen, 0, NULL, write_zip_entry);
 351        write_zip_trailer(commit ? commit->object.sha1 : NULL);
 352
 353        free(zip_dir);
 354        free(base);
 355
 356        return 0;
 357}
 358
 359int write_zip_archive(struct archiver_args *args)
 360{
 361        int plen = strlen(args->base);
 362
 363        dos_time(&args->time, &zip_date, &zip_time);
 364
 365        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 366        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 367        verbose = args->verbose;
 368
 369        if (args->base && plen > 0 && args->base[plen - 1] == '/') {
 370                char *base = xstrdup(args->base);
 371                int baselen = strlen(base);
 372
 373                while (baselen > 0 && base[baselen - 1] == '/')
 374                        base[--baselen] = '\0';
 375                write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
 376                free(base);
 377        }
 378        read_tree_recursive(args->tree, args->base, plen, 0,
 379                            args->pathspec, write_zip_entry);
 380        write_zip_trailer(args->commit_sha1);
 381
 382        free(zip_dir);
 383
 384        return 0;
 385}
 386
 387void *parse_extra_zip_args(int argc, const char **argv)
 388{
 389        for (; argc > 0; argc--, argv++) {
 390                const char *arg = argv[0];
 391
 392                if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
 393                        zlib_compression_level = arg[1] - '0';
 394                else
 395                        die("Unknown argument for zip format: %s", arg);
 396        }
 397        return NULL;
 398}