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;
  15
  16static unsigned char *zip_dir;
  17static unsigned int zip_dir_size;
  18
  19static unsigned int zip_offset;
  20static unsigned int zip_dir_offset;
  21static unsigned int zip_dir_entries;
  22
  23#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  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_dir_header {
  41        unsigned char magic[4];
  42        unsigned char creator_version[2];
  43        unsigned char version[2];
  44        unsigned char flags[2];
  45        unsigned char compression_method[2];
  46        unsigned char mtime[2];
  47        unsigned char mdate[2];
  48        unsigned char crc32[4];
  49        unsigned char compressed_size[4];
  50        unsigned char size[4];
  51        unsigned char filename_length[2];
  52        unsigned char extra_length[2];
  53        unsigned char comment_length[2];
  54        unsigned char disk[2];
  55        unsigned char attr1[2];
  56        unsigned char attr2[4];
  57        unsigned char offset[4];
  58        unsigned char _end[1];
  59};
  60
  61struct zip_dir_trailer {
  62        unsigned char magic[4];
  63        unsigned char disk[2];
  64        unsigned char directory_start_disk[2];
  65        unsigned char entries_on_this_disk[2];
  66        unsigned char entries[2];
  67        unsigned char size[4];
  68        unsigned char offset[4];
  69        unsigned char comment_length[2];
  70        unsigned char _end[1];
  71};
  72
  73/*
  74 * On ARM, padding is added at the end of the struct, so a simple
  75 * sizeof(struct ...) reports two bytes more than the payload size
  76 * we're interested in.
  77 */
  78#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
  79#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
  80#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
  81
  82static void copy_le16(unsigned char *dest, unsigned int n)
  83{
  84        dest[0] = 0xff & n;
  85        dest[1] = 0xff & (n >> 010);
  86}
  87
  88static void copy_le32(unsigned char *dest, unsigned int n)
  89{
  90        dest[0] = 0xff & n;
  91        dest[1] = 0xff & (n >> 010);
  92        dest[2] = 0xff & (n >> 020);
  93        dest[3] = 0xff & (n >> 030);
  94}
  95
  96static void *zlib_deflate(void *data, unsigned long size,
  97                          unsigned long *compressed_size)
  98{
  99        z_stream stream;
 100        unsigned long maxsize;
 101        void *buffer;
 102        int result;
 103
 104        memset(&stream, 0, sizeof(stream));
 105        deflateInit(&stream, zlib_compression_level);
 106        maxsize = deflateBound(&stream, size);
 107        buffer = xmalloc(maxsize);
 108
 109        stream.next_in = data;
 110        stream.avail_in = size;
 111        stream.next_out = buffer;
 112        stream.avail_out = maxsize;
 113
 114        do {
 115                result = deflate(&stream, Z_FINISH);
 116        } while (result == Z_OK);
 117
 118        if (result != Z_STREAM_END) {
 119                free(buffer);
 120                return NULL;
 121        }
 122
 123        deflateEnd(&stream);
 124        *compressed_size = stream.total_out;
 125
 126        return buffer;
 127}
 128
 129static char *construct_path(const char *base, int baselen,
 130                            const char *filename, int isdir, int *pathlen)
 131{
 132        int filenamelen = strlen(filename);
 133        int len = baselen + filenamelen;
 134        char *path, *p;
 135
 136        if (isdir)
 137                len++;
 138        p = path = xmalloc(len + 1);
 139
 140        memcpy(p, base, baselen);
 141        p += baselen;
 142        memcpy(p, filename, filenamelen);
 143        p += filenamelen;
 144        if (isdir)
 145                *p++ = '/';
 146        *p = '\0';
 147
 148        *pathlen = len;
 149
 150        return path;
 151}
 152
 153static int write_zip_entry(const unsigned char *sha1,
 154                           const char *base, int baselen,
 155                           const char *filename, unsigned mode, int stage)
 156{
 157        struct zip_local_header header;
 158        struct zip_dir_header dirent;
 159        unsigned long attr2;
 160        unsigned long compressed_size;
 161        unsigned long uncompressed_size;
 162        unsigned long crc;
 163        unsigned long direntsize;
 164        unsigned long size;
 165        int method;
 166        int result = -1;
 167        int pathlen;
 168        unsigned char *out;
 169        char *path;
 170        enum object_type type;
 171        void *buffer = NULL;
 172        void *deflated = NULL;
 173
 174        crc = crc32(0, NULL, 0);
 175
 176        path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
 177        if (verbose)
 178                fprintf(stderr, "%s\n", path);
 179        if (pathlen > 0xffff) {
 180                error("path too long (%d chars, SHA1: %s): %s", pathlen,
 181                      sha1_to_hex(sha1), path);
 182                goto out;
 183        }
 184
 185        if (S_ISDIR(mode)) {
 186                method = 0;
 187                attr2 = 16;
 188                result = READ_TREE_RECURSIVE;
 189                out = NULL;
 190                uncompressed_size = 0;
 191                compressed_size = 0;
 192        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 193                method = 0;
 194                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : 0;
 195                if (S_ISREG(mode) && zlib_compression_level != 0)
 196                        method = 8;
 197                result = 0;
 198                buffer = read_sha1_file(sha1, &type, &size);
 199                if (!buffer)
 200                        die("cannot read %s", sha1_to_hex(sha1));
 201                crc = crc32(crc, buffer, size);
 202                out = buffer;
 203                uncompressed_size = size;
 204                compressed_size = size;
 205        } else {
 206                error("unsupported file mode: 0%o (SHA1: %s)", mode,
 207                      sha1_to_hex(sha1));
 208                goto out;
 209        }
 210
 211        if (method == 8) {
 212                deflated = zlib_deflate(buffer, size, &compressed_size);
 213                if (deflated && compressed_size - 6 < size) {
 214                        /* ZLIB --> raw compressed data (see RFC 1950) */
 215                        /* CMF and FLG ... */
 216                        out = (unsigned char *)deflated + 2;
 217                        compressed_size -= 6;   /* ... and ADLER32 */
 218                } else {
 219                        method = 0;
 220                        compressed_size = size;
 221                }
 222        }
 223
 224        /* make sure we have enough free space in the dictionary */
 225        direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
 226        while (zip_dir_size < zip_dir_offset + direntsize) {
 227                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 228                zip_dir = xrealloc(zip_dir, zip_dir_size);
 229        }
 230
 231        copy_le32(dirent.magic, 0x02014b50);
 232        copy_le16(dirent.creator_version, S_ISLNK(mode) ? 0x0317 : 0);
 233        copy_le16(dirent.version, 10);
 234        copy_le16(dirent.flags, 0);
 235        copy_le16(dirent.compression_method, method);
 236        copy_le16(dirent.mtime, zip_time);
 237        copy_le16(dirent.mdate, zip_date);
 238        copy_le32(dirent.crc32, crc);
 239        copy_le32(dirent.compressed_size, compressed_size);
 240        copy_le32(dirent.size, uncompressed_size);
 241        copy_le16(dirent.filename_length, pathlen);
 242        copy_le16(dirent.extra_length, 0);
 243        copy_le16(dirent.comment_length, 0);
 244        copy_le16(dirent.disk, 0);
 245        copy_le16(dirent.attr1, 0);
 246        copy_le32(dirent.attr2, attr2);
 247        copy_le32(dirent.offset, zip_offset);
 248        memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 249        zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 250        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 251        zip_dir_offset += pathlen;
 252        zip_dir_entries++;
 253
 254        copy_le32(header.magic, 0x04034b50);
 255        copy_le16(header.version, 10);
 256        copy_le16(header.flags, 0);
 257        copy_le16(header.compression_method, method);
 258        copy_le16(header.mtime, zip_time);
 259        copy_le16(header.mdate, zip_date);
 260        copy_le32(header.crc32, crc);
 261        copy_le32(header.compressed_size, compressed_size);
 262        copy_le32(header.size, uncompressed_size);
 263        copy_le16(header.filename_length, pathlen);
 264        copy_le16(header.extra_length, 0);
 265        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 266        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 267        write_or_die(1, path, pathlen);
 268        zip_offset += pathlen;
 269        if (compressed_size > 0) {
 270                write_or_die(1, out, compressed_size);
 271                zip_offset += compressed_size;
 272        }
 273
 274out:
 275        free(buffer);
 276        free(deflated);
 277        free(path);
 278
 279        return result;
 280}
 281
 282static void write_zip_trailer(const unsigned char *sha1)
 283{
 284        struct zip_dir_trailer trailer;
 285
 286        copy_le32(trailer.magic, 0x06054b50);
 287        copy_le16(trailer.disk, 0);
 288        copy_le16(trailer.directory_start_disk, 0);
 289        copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
 290        copy_le16(trailer.entries, zip_dir_entries);
 291        copy_le32(trailer.size, zip_dir_offset);
 292        copy_le32(trailer.offset, zip_offset);
 293        copy_le16(trailer.comment_length, sha1 ? 40 : 0);
 294
 295        write_or_die(1, zip_dir, zip_dir_offset);
 296        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 297        if (sha1)
 298                write_or_die(1, sha1_to_hex(sha1), 40);
 299}
 300
 301static void dos_time(time_t *time, int *dos_date, int *dos_time)
 302{
 303        struct tm *t = localtime(time);
 304
 305        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 306                    (t->tm_year + 1900 - 1980) * 512;
 307        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 308}
 309
 310int write_zip_archive(struct archiver_args *args)
 311{
 312        int plen = strlen(args->base);
 313
 314        dos_time(&args->time, &zip_date, &zip_time);
 315
 316        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 317        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 318        verbose = args->verbose;
 319
 320        if (args->base && plen > 0 && args->base[plen - 1] == '/') {
 321                char *base = xstrdup(args->base);
 322                int baselen = strlen(base);
 323
 324                while (baselen > 0 && base[baselen - 1] == '/')
 325                        base[--baselen] = '\0';
 326                write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
 327                free(base);
 328        }
 329        read_tree_recursive(args->tree, args->base, plen, 0,
 330                            args->pathspec, write_zip_entry);
 331        write_zip_trailer(args->commit_sha1);
 332
 333        free(zip_dir);
 334
 335        return 0;
 336}
 337
 338void *parse_extra_zip_args(int argc, const char **argv)
 339{
 340        for (; argc > 0; argc--, argv++) {
 341                const char *arg = argv[0];
 342
 343                if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
 344                        zlib_compression_level = arg[1] - '0';
 345                else
 346                        die("Unknown argument for zip format: %s", arg);
 347        }
 348        return NULL;
 349}