Andrew's git - gitweb.git/blob

   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 int verbose;
  14static int zip_date;
  15static int zip_time;
  16
  17static unsigned char *zip_dir;
  18static unsigned int zip_dir_size;
  19
  20static unsigned int zip_offset;
  21static unsigned int zip_dir_offset;
  22static unsigned int zip_dir_entries;
  23
  24#define ZIP_DIRECTORY_MIN_SIZE  (1024 * 1024)
  25
  26struct zip_local_header {
  27        unsigned char magic[4];
  28        unsigned char version[2];
  29        unsigned char flags[2];
  30        unsigned char compression_method[2];
  31        unsigned char mtime[2];
  32        unsigned char mdate[2];
  33        unsigned char crc32[4];
  34        unsigned char compressed_size[4];
  35        unsigned char size[4];
  36        unsigned char filename_length[2];
  37        unsigned char extra_length[2];
  38        unsigned char _end[1];
  39};
  40
  41struct zip_dir_header {
  42        unsigned char magic[4];
  43        unsigned char creator_version[2];
  44        unsigned char version[2];
  45        unsigned char flags[2];
  46        unsigned char compression_method[2];
  47        unsigned char mtime[2];
  48        unsigned char mdate[2];
  49        unsigned char crc32[4];
  50        unsigned char compressed_size[4];
  51        unsigned char size[4];
  52        unsigned char filename_length[2];
  53        unsigned char extra_length[2];
  54        unsigned char comment_length[2];
  55        unsigned char disk[2];
  56        unsigned char attr1[2];
  57        unsigned char attr2[4];
  58        unsigned char offset[4];
  59        unsigned char _end[1];
  60};
  61
  62struct zip_dir_trailer {
  63        unsigned char magic[4];
  64        unsigned char disk[2];
  65        unsigned char directory_start_disk[2];
  66        unsigned char entries_on_this_disk[2];
  67        unsigned char entries[2];
  68        unsigned char size[4];
  69        unsigned char offset[4];
  70        unsigned char comment_length[2];
  71        unsigned char _end[1];
  72};
  73
  74/*
  75 * On ARM, padding is added at the end of the struct, so a simple
  76 * sizeof(struct ...) reports two bytes more than the payload size
  77 * we're interested in.
  78 */
  79#define ZIP_LOCAL_HEADER_SIZE   offsetof(struct zip_local_header, _end)
  80#define ZIP_DIR_HEADER_SIZE     offsetof(struct zip_dir_header, _end)
  81#define ZIP_DIR_TRAILER_SIZE    offsetof(struct zip_dir_trailer, _end)
  82
  83static void copy_le16(unsigned char *dest, unsigned int n)
  84{
  85        dest[0] = 0xff & n;
  86        dest[1] = 0xff & (n >> 010);
  87}
  88
  89static void copy_le32(unsigned char *dest, unsigned int n)
  90{
  91        dest[0] = 0xff & n;
  92        dest[1] = 0xff & (n >> 010);
  93        dest[2] = 0xff & (n >> 020);
  94        dest[3] = 0xff & (n >> 030);
  95}
  96
  97static void *zlib_deflate(void *data, unsigned long size,
  98                          unsigned long *compressed_size)
  99{
 100        z_stream stream;
 101        unsigned long maxsize;
 102        void *buffer;
 103        int result;
 104
 105        memset(&stream, 0, sizeof(stream));
 106        deflateInit(&stream, zlib_compression_level);
 107        maxsize = deflateBound(&stream, size);
 108        buffer = xmalloc(maxsize);
 109
 110        stream.next_in = data;
 111        stream.avail_in = size;
 112        stream.next_out = buffer;
 113        stream.avail_out = maxsize;
 114
 115        do {
 116                result = deflate(&stream, Z_FINISH);
 117        } while (result == Z_OK);
 118
 119        if (result != Z_STREAM_END) {
 120                free(buffer);
 121                return NULL;
 122        }
 123
 124        deflateEnd(&stream);
 125        *compressed_size = stream.total_out;
 126
 127        return buffer;
 128}
 129
 130static char *construct_path(const char *base, int baselen,
 131                            const char *filename, int isdir, int *pathlen)
 132{
 133        int filenamelen = strlen(filename);
 134        int len = baselen + filenamelen;
 135        char *path, *p;
 136
 137        if (isdir)
 138                len++;
 139        p = path = xmalloc(len + 1);
 140
 141        memcpy(p, base, baselen);
 142        p += baselen;
 143        memcpy(p, filename, filenamelen);
 144        p += filenamelen;
 145        if (isdir)
 146                *p++ = '/';
 147        *p = '\0';
 148
 149        *pathlen = len;
 150
 151        return path;
 152}
 153
 154static int write_zip_entry(const unsigned char *sha1,
 155                           const char *base, int baselen,
 156                           const char *filename, unsigned mode, int stage)
 157{
 158        struct zip_local_header header;
 159        struct zip_dir_header dirent;
 160        unsigned long attr2;
 161        unsigned long compressed_size;
 162        unsigned long uncompressed_size;
 163        unsigned long crc;
 164        unsigned long direntsize;
 165        unsigned long size;
 166        int method;
 167        int result = -1;
 168        int pathlen;
 169        unsigned char *out;
 170        char *path;
 171        char type[20];
 172        void *buffer = NULL;
 173        void *deflated = NULL;
 174
 175        crc = crc32(0, NULL, 0);
 176
 177        path = construct_path(base, baselen, filename, S_ISDIR(mode), &pathlen);
 178        if (verbose)
 179                fprintf(stderr, "%s\n", path);
 180        if (pathlen > 0xffff) {
 181                error("path too long (%d chars, SHA1: %s): %s", pathlen,
 182                      sha1_to_hex(sha1), path);
 183                goto out;
 184        }
 185
 186        if (S_ISDIR(mode)) {
 187                method = 0;
 188                attr2 = 16;
 189                result = READ_TREE_RECURSIVE;
 190                out = NULL;
 191                uncompressed_size = 0;
 192                compressed_size = 0;
 193        } else if (S_ISREG(mode) || S_ISLNK(mode)) {
 194                method = 0;
 195                attr2 = S_ISLNK(mode) ? ((mode | 0777) << 16) : 0;
 196                if (S_ISREG(mode) && zlib_compression_level != 0)
 197                        method = 8;
 198                result = 0;
 199                buffer = read_sha1_file(sha1, type, &size);
 200                if (!buffer)
 201                        die("cannot read %s", sha1_to_hex(sha1));
 202                crc = crc32(crc, buffer, size);
 203                out = buffer;
 204                uncompressed_size = size;
 205                compressed_size = size;
 206        } else {
 207                error("unsupported file mode: 0%o (SHA1: %s)", mode,
 208                      sha1_to_hex(sha1));
 209                goto out;
 210        }
 211
 212        if (method == 8) {
 213                deflated = zlib_deflate(buffer, size, &compressed_size);
 214                if (deflated && compressed_size - 6 < size) {
 215                        /* ZLIB --> raw compressed data (see RFC 1950) */
 216                        /* CMF and FLG ... */
 217                        out = (unsigned char *)deflated + 2;
 218                        compressed_size -= 6;   /* ... and ADLER32 */
 219                } else {
 220                        method = 0;
 221                        compressed_size = size;
 222                }
 223        }
 224
 225        /* make sure we have enough free space in the dictionary */
 226        direntsize = ZIP_DIR_HEADER_SIZE + pathlen;
 227        while (zip_dir_size < zip_dir_offset + direntsize) {
 228                zip_dir_size += ZIP_DIRECTORY_MIN_SIZE;
 229                zip_dir = xrealloc(zip_dir, zip_dir_size);
 230        }
 231
 232        copy_le32(dirent.magic, 0x02014b50);
 233        copy_le16(dirent.creator_version, S_ISLNK(mode) ? 0x0317 : 0);
 234        copy_le16(dirent.version, 10);
 235        copy_le16(dirent.flags, 0);
 236        copy_le16(dirent.compression_method, method);
 237        copy_le16(dirent.mtime, zip_time);
 238        copy_le16(dirent.mdate, zip_date);
 239        copy_le32(dirent.crc32, crc);
 240        copy_le32(dirent.compressed_size, compressed_size);
 241        copy_le32(dirent.size, uncompressed_size);
 242        copy_le16(dirent.filename_length, pathlen);
 243        copy_le16(dirent.extra_length, 0);
 244        copy_le16(dirent.comment_length, 0);
 245        copy_le16(dirent.disk, 0);
 246        copy_le16(dirent.attr1, 0);
 247        copy_le32(dirent.attr2, attr2);
 248        copy_le32(dirent.offset, zip_offset);
 249        memcpy(zip_dir + zip_dir_offset, &dirent, ZIP_DIR_HEADER_SIZE);
 250        zip_dir_offset += ZIP_DIR_HEADER_SIZE;
 251        memcpy(zip_dir + zip_dir_offset, path, pathlen);
 252        zip_dir_offset += pathlen;
 253        zip_dir_entries++;
 254
 255        copy_le32(header.magic, 0x04034b50);
 256        copy_le16(header.version, 10);
 257        copy_le16(header.flags, 0);
 258        copy_le16(header.compression_method, method);
 259        copy_le16(header.mtime, zip_time);
 260        copy_le16(header.mdate, zip_date);
 261        copy_le32(header.crc32, crc);
 262        copy_le32(header.compressed_size, compressed_size);
 263        copy_le32(header.size, uncompressed_size);
 264        copy_le16(header.filename_length, pathlen);
 265        copy_le16(header.extra_length, 0);
 266        write_or_die(1, &header, ZIP_LOCAL_HEADER_SIZE);
 267        zip_offset += ZIP_LOCAL_HEADER_SIZE;
 268        write_or_die(1, path, pathlen);
 269        zip_offset += pathlen;
 270        if (compressed_size > 0) {
 271                write_or_die(1, out, compressed_size);
 272                zip_offset += compressed_size;
 273        }
 274
 275out:
 276        free(buffer);
 277        free(deflated);
 278        free(path);
 279
 280        return result;
 281}
 282
 283static void write_zip_trailer(const unsigned char *sha1)
 284{
 285        struct zip_dir_trailer trailer;
 286
 287        copy_le32(trailer.magic, 0x06054b50);
 288        copy_le16(trailer.disk, 0);
 289        copy_le16(trailer.directory_start_disk, 0);
 290        copy_le16(trailer.entries_on_this_disk, zip_dir_entries);
 291        copy_le16(trailer.entries, zip_dir_entries);
 292        copy_le32(trailer.size, zip_dir_offset);
 293        copy_le32(trailer.offset, zip_offset);
 294        copy_le16(trailer.comment_length, sha1 ? 40 : 0);
 295
 296        write_or_die(1, zip_dir, zip_dir_offset);
 297        write_or_die(1, &trailer, ZIP_DIR_TRAILER_SIZE);
 298        if (sha1)
 299                write_or_die(1, sha1_to_hex(sha1), 40);
 300}
 301
 302static void dos_time(time_t *time, int *dos_date, int *dos_time)
 303{
 304        struct tm *t = localtime(time);
 305
 306        *dos_date = t->tm_mday + (t->tm_mon + 1) * 32 +
 307                    (t->tm_year + 1900 - 1980) * 512;
 308        *dos_time = t->tm_sec / 2 + t->tm_min * 32 + t->tm_hour * 2048;
 309}
 310
 311int write_zip_archive(struct archiver_args *args)
 312{
 313        int plen = strlen(args->base);
 314
 315        dos_time(&args->time, &zip_date, &zip_time);
 316
 317        zip_dir = xmalloc(ZIP_DIRECTORY_MIN_SIZE);
 318        zip_dir_size = ZIP_DIRECTORY_MIN_SIZE;
 319        verbose = args->verbose;
 320
 321        if (args->base && plen > 0 && args->base[plen - 1] == '/') {
 322                char *base = xstrdup(args->base);
 323                int baselen = strlen(base);
 324
 325                while (baselen > 0 && base[baselen - 1] == '/')
 326                        base[--baselen] = '\0';
 327                write_zip_entry(args->tree->object.sha1, "", 0, base, 040777, 0);
 328                free(base);
 329        }
 330        read_tree_recursive(args->tree, args->base, plen, 0,
 331                            args->pathspec, write_zip_entry);
 332        write_zip_trailer(args->commit_sha1);
 333
 334        free(zip_dir);
 335
 336        return 0;
 337}
 338
 339void *parse_extra_zip_args(int argc, const char **argv)
 340{
 341        for (; argc > 0; argc--, argv++) {
 342                const char *arg = argv[0];
 343
 344                if (arg[0] == '-' && isdigit(arg[1]) && arg[2] == '\0')
 345                        zlib_compression_level = arg[1] - '0';
 346                else
 347                        die("Unknown argument for zip format: %s", arg);
 348        }
 349        return NULL;
 350}