contrib/libarchive/archive_read_support_format_iso9660.c

   1 /*-
   2  * Copyright (c) 2003-2004 Tim Kientzle
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer
  10  *    in this position and unchanged.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26
  27 #include "archive_platform.h"
  28 __FBSDID("$FreeBSD: src/lib/libarchive/archive_read_support_format_iso9660.c,v 1.8 2005/04/06 04:19:30 kientzle Exp $");
  29
  30 #include <sys/stat.h>
  31
  32 #include <errno.h>
  33 /* #include <stdint.h> */ /* See archive_platform.h */
  34 #include <stdio.h>
  35 #include <stdlib.h>
  36 #include <string.h>
  37 #include <time.h>
  38 #include <unistd.h>
  39
  40 #include "archive.h"
  41 #include "archive_entry.h"
  42 #include "archive_private.h"
  43 #include "archive_string.h"
  44
  45 /*
  46  * An overview of ISO 9660 format:
  47  *
  48  * Each disk is laid out as follows:
  49  *   * 32k reserved for private use
  50  *   * Volume descriptor table.  Each volume descriptor
  51  *     is 2k and specifies basic format information.
  52  *     The "Primary Volume Descriptor" (PVD) is defined by the
  53  *     standard and should always be present; other volume
  54  *     descriptors include various vendor-specific extensions.
  55  *   * Files and directories.  Each file/dir is specified by
  56  *     an "extent" (starting sector and length in bytes).
  57  *     Dirs are just files with directory records packed one
  58  *     after another.  The PVD contains a single dir entry
  59  *     specifying the location of the root directory.  Everything
  60  *     else follows from there.
  61  *
  62  * This module works by first reading the volume descriptors, then
  63  * building a list of directory entries, sorted by starting
  64  * sector.  At each step, I look for the earliest dir entry that
  65  * hasn't yet been read, seek forward to that location and read
  66  * that entry.  If it's a dir, I slurp in the new dir entries and
  67  * add them to the heap; if it's a regular file, I return the
  68  * corresponding archive_entry and wait for the client to request
  69  * the file body.  This strategy allows us to read most compliant
  70  * CDs with a single pass through the data, as required by libarchive.
  71  */
  72
  73 /* Structure of on-disk PVD. */
  74 struct iso9660_primary_volume_descriptor {
  75         unsigned char   type[1];
  76         char    id[5];
  77         unsigned char   version[1];
  78         char    reserved1[1];
  79         char    system_id[32];
  80         char    volume_id[32];
  81         char    reserved2[8];
  82         char    volume_space_size[8];
  83         char    reserved3[32];
  84         char    volume_set_size[4];
  85         char    volume_sequence_number[4];
  86         char    logical_block_size[4];
  87         char    path_table_size[8];
  88         char    type_1_path_table[4];
  89         char    opt_type_1_path_table[4];
  90         char    type_m_path_table[4];
  91         char    opt_type_m_path_table[4];
  92         char    root_directory_record[34];
  93         char    volume_set_id[128];
  94         char    publisher_id[128];
  95         char    preparer_id[128];
  96         char    application_id[128];
  97         char    copyright_file_id[37];
  98         char    abstract_file_id[37];
  99         char    bibliographic_file_id[37];
 100         char    creation_date[17];
 101         char    modification_date[17];
 102         char    expiration_date[17];
 103         char    effective_date[17];
 104         char    file_structure_version[1];
 105         char    reserved4[1];
 106         char    application_data[512];
 107 };
 108
 109 /* Structure of an on-disk directory record. */
 110 struct iso9660_directory_record {
 111         unsigned char length[1];
 112         unsigned char ext_attr_length[1];
 113         unsigned char extent[8];
 114         unsigned char size[8];
 115         char date[7];
 116         unsigned char flags[1];
 117         unsigned char file_unit_size[1];
 118         unsigned char interleave[1];
 119         unsigned char volume_sequence_number[4];
 120         unsigned char name_len[1];
 121         char name[1];
 122 };
 123
 124
 125 /*
 126  * Our private data.
 127  */
 128
 129 /* In-memory storage for a directory record. */
 130 struct file_info {
 131         struct file_info        *parent;
 132         int              refcount;
 133         uint64_t         offset;  /* Offset on disk. */
 134         uint64_t         size;  /* File size in bytes. */
 135         uint64_t         ce_offset; /* Offset of CE */
 136         uint64_t         ce_size; /* Size of CE */
 137         time_t           mtime; /* File last modified time. */
 138         time_t           atime; /* File last accessed time. */
 139         time_t           ctime; /* File creation time. */
 140         mode_t           mode;
 141         uid_t            uid;
 142         gid_t            gid;
 143         ino_t            inode;
 144         int              nlinks;
 145         char            *name; /* Null-terminated filename. */
 146         struct archive_string symlink;
 147 };
 148
 149
 150 struct iso9660 {
 151         int     magic;
 152 #define ISO9660_MAGIC   0x96609660
 153         int     bid; /* If non-zero, return this as our bid. */
 154         struct archive_string pathname;
 155         char    seenRockridge; /* Set true if RR extensions are used. */
 156         unsigned char   suspOffset;
 157
 158         uint64_t        previous_offset;
 159         uint64_t        previous_size;
 160         struct archive_string previous_pathname;
 161
 162         /* TODO: Make this a heap for fast inserts and deletions. */
 163         struct file_info **pending_files;
 164         int     pending_files_allocated;
 165         int     pending_files_used;
 166
 167         uint64_t current_position;
 168         ssize_t logical_block_size;
 169
 170         off_t   entry_sparse_offset;
 171         ssize_t entry_bytes_remaining;
 172 };
 173
 174 static void     add_entry(struct iso9660 *iso9660, struct file_info *file);
 175 static int      archive_read_format_iso9660_bid(struct archive *);
 176 static int      archive_read_format_iso9660_cleanup(struct archive *);
 177 static int      archive_read_format_iso9660_read_data(struct archive *,
 178                     const void **, size_t *, off_t *);
 179 static int      archive_read_format_iso9660_read_header(struct archive *,
 180                     struct archive_entry *);
 181 static const char *build_pathname(struct archive_string *, struct file_info *);
 182 static void     dump_isodirrec(FILE *, const struct iso9660_directory_record *);
 183 static time_t   isodate17(const void *);
 184 static time_t   isodate7(const void *);
 185 static int      isPVD(struct iso9660 *, const char *);
 186 static struct file_info *next_entry(struct iso9660 *);
 187 static int      next_entry_seek(struct archive *a, struct iso9660 *iso9660,
 188                     struct file_info **pfile);
 189 static struct file_info *
 190                 parse_file_info(struct iso9660 *iso9660,
 191                     struct file_info *parent,
 192                     const struct iso9660_directory_record *isodirrec);
 193 static void     parse_rockridge(struct iso9660 *iso9660,
 194                     struct file_info *file, const unsigned char *start,
 195                     const unsigned char *end);
 196 static void     release_file(struct iso9660 *, struct file_info *);
 197 static int      toi(const void *p, int n);
 198
 199 int
 200 archive_read_support_format_iso9660(struct archive *a)
 201 {
 202         struct iso9660 *iso9660;
 203         int r;
 204
 205         iso9660 = malloc(sizeof(*iso9660));
 206         memset(iso9660, 0, sizeof(*iso9660));
 207         iso9660->magic = ISO9660_MAGIC;
 208         iso9660->bid = -1; /* We haven't yet bid. */
 209
 210         r = __archive_read_register_format(a,
 211             iso9660,
 212             archive_read_format_iso9660_bid,
 213             archive_read_format_iso9660_read_header,
 214             archive_read_format_iso9660_read_data,
 215             NULL,
 216             archive_read_format_iso9660_cleanup);
 217
 218         if (r != ARCHIVE_OK) {
 219                 free(iso9660);
 220                 return (r);
 221         }
 222         return (ARCHIVE_OK);
 223 }
 224
 225
 226 static int
 227 archive_read_format_iso9660_bid(struct archive *a)
 228 {
 229         struct iso9660 *iso9660;
 230         ssize_t bytes_read;
 231         const void *h;
 232         const char *p;
 233
 234         iso9660 = *(a->pformat_data);
 235
 236         if (iso9660->bid >= 0)
 237                 return (iso9660->bid);
 238
 239         /*
 240          * Skip the first 32k (reserved area) and get the first
 241          * 8 sectors of the volume descriptor table.  Of course,
 242          * if the I/O layer gives us more, we'll take it.
 243          */
 244         bytes_read = (a->compression_read_ahead)(a, &h, 32768 + 8*2048);
 245         if (bytes_read < 32768 + 8*2048)
 246             return (iso9660->bid = -1);
 247         p = (const char *)h;
 248
 249         /* Skip the reserved area. */
 250         bytes_read -= 32768;
 251         p += 32768;
 252
 253         /* Check each volume descriptor to locate the PVD. */
 254         for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
 255                 iso9660->bid = isPVD(iso9660, p);
 256                 if (iso9660->bid > 0)
 257                         return (iso9660->bid);
 258                 if (*p == '\xff') /* End-of-volume-descriptor marker. */
 259                         break;
 260         }
 261
 262         /* We didn't find a valid PVD; return a bid of zero. */
 263         iso9660->bid = 0;
 264         return (iso9660->bid);
 265 }
 266
 267 static int
 268 isPVD(struct iso9660 *iso9660, const char *h)
 269 {
 270         const struct iso9660_primary_volume_descriptor *voldesc;
 271         struct file_info *file;
 272
 273         if (h[0] != 1)
 274                 return (0);
 275         if (memcmp(h+1, "CD001", 5) != 0)
 276                 return (0);
 277
 278
 279         voldesc = (const struct iso9660_primary_volume_descriptor *)h;
 280         iso9660->logical_block_size = toi(&voldesc->logical_block_size, 2);
 281
 282         /* Store the root directory in the pending list. */
 283         file = parse_file_info(iso9660, NULL,
 284             (struct iso9660_directory_record *)&voldesc->root_directory_record);
 285         add_entry(iso9660, file);
 286         return (48);
 287 }
 288
 289 static int
 290 archive_read_format_iso9660_read_header(struct archive *a,
 291     struct archive_entry *entry)
 292 {
 293         struct stat st;
 294         struct iso9660 *iso9660;
 295         struct file_info *file;
 296         ssize_t bytes_read;
 297         int r;
 298
 299         iso9660 = *(a->pformat_data);
 300
 301         if (iso9660->seenRockridge) {
 302                 a->archive_format = ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
 303                 a->archive_format_name = "ISO9660 with Rockridge extensions";
 304         } else {
 305                 a->archive_format = ARCHIVE_FORMAT_ISO9660;
 306                 a->archive_format_name = "ISO9660";
 307         }
 308
 309         /* Get the next entry that appears after the current offset. */
 310         r = next_entry_seek(a, iso9660, &file);
 311         if (r != ARCHIVE_OK)
 312                 return (r);
 313
 314         iso9660->entry_bytes_remaining = file->size;
 315         iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
 316
 317         /* Set up the entry structure with information about this entry. */
 318         memset(&st, 0, sizeof(st));
 319         st.st_mode = file->mode;
 320         st.st_uid = file->uid;
 321         st.st_gid = file->gid;
 322         st.st_nlink = file->nlinks;
 323         st.st_ino = file->inode;
 324         st.st_mtime = file->mtime;
 325         st.st_ctime = file->ctime;
 326         st.st_atime = file->atime;
 327         st.st_size = iso9660->entry_bytes_remaining;
 328         archive_entry_copy_stat(entry, &st);
 329         archive_string_empty(&iso9660->pathname);
 330         archive_entry_set_pathname(entry,
 331             build_pathname(&iso9660->pathname, file));
 332         if (file->symlink.s != NULL)
 333                 archive_entry_set_symlink(entry, file->symlink.s);
 334
 335         /* If this entry points to the same data as the previous
 336          * entry, convert this into a hardlink to that entry.
 337          * But don't bother for zero-length files. */
 338         if (file->offset == iso9660->previous_offset
 339             && file->size == iso9660->previous_size
 340             && file->size > 0) {
 341                 archive_entry_set_hardlink(entry,
 342                     iso9660->previous_pathname.s);
 343                 iso9660->entry_bytes_remaining = 0;
 344                 iso9660->entry_sparse_offset = 0;
 345                 release_file(iso9660, file);
 346                 return (ARCHIVE_OK);
 347         }
 348
 349         /* If the offset is before our current position, we can't
 350          * seek backwards to extract it, so issue a warning. */
 351         if (file->offset < iso9660->current_position) {
 352                 archive_set_error(a, ARCHIVE_ERRNO_MISC,
 353                     "Ignoring out-of-order file");
 354                 iso9660->entry_bytes_remaining = 0;
 355                 iso9660->entry_sparse_offset = 0;
 356                 release_file(iso9660, file);
 357                 return (ARCHIVE_WARN);
 358         }
 359
 360         iso9660->previous_size = file->size;
 361         iso9660->previous_offset = file->offset;
 362         archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
 363
 364         /* If this is a directory, read in all of the entries right now. */
 365         if (S_ISDIR(st.st_mode)) {
 366                 while(iso9660->entry_bytes_remaining > 0) {
 367                         const void *block;
 368                         const unsigned char *p;
 369                         ssize_t step = iso9660->logical_block_size;
 370                         if (step > iso9660->entry_bytes_remaining)
 371                                 step = iso9660->entry_bytes_remaining;
 372                         bytes_read = (a->compression_read_ahead)(a, &block, step);
 373                         if (bytes_read < step) {
 374                                 archive_set_error(a, ARCHIVE_ERRNO_MISC,
 375             "Failed to read full block when scanning ISO9660 directory list");
 376                                 release_file(iso9660, file);
 377                                 return (ARCHIVE_FATAL);
 378                         }
 379                         if (bytes_read > step)
 380                                 bytes_read = step;
 381                         (a->compression_read_consume)(a, bytes_read);
 382                         iso9660->current_position += bytes_read;
 383                         iso9660->entry_bytes_remaining -= bytes_read;
 384                         for (p = block;
 385                              *p != 0 && p < (const unsigned char *)block + bytes_read;
 386                              p += *p) {
 387                                 const struct iso9660_directory_record *dr
 388                                     = (const struct iso9660_directory_record *)p;
 389                                 struct file_info *child;
 390
 391                                 /* Skip '.' entry. */
 392                                 if (dr->name_len[0] == 1
 393                                     && dr->name[0] == '\0')
 394                                         continue;
 395                                 /* Skip '..' entry. */
 396                                 if (dr->name_len[0] == 1
 397                                     && dr->name[0] == '\001')
 398                                         continue;
 399                                 child = parse_file_info(iso9660, file, dr);
 400                                 add_entry(iso9660, child);
 401                         }
 402                 }
 403         }
 404
 405         release_file(iso9660, file);
 406         return (ARCHIVE_OK);
 407 }
 408
 409 static int
 410 archive_read_format_iso9660_read_data(struct archive *a,
 411     const void **buff, size_t *size, off_t *offset)
 412 {
 413         ssize_t bytes_read;
 414         struct iso9660 *iso9660;
 415
 416         iso9660 = *(a->pformat_data);
 417         if (iso9660->entry_bytes_remaining <= 0) {
 418                 *buff = NULL;
 419                 *size = 0;
 420                 *offset = iso9660->entry_sparse_offset;
 421                 return (ARCHIVE_EOF);
 422         }
 423
 424         bytes_read = (a->compression_read_ahead)(a, buff, 1);
 425         if (bytes_read <= 0)
 426                 return (ARCHIVE_FATAL);
 427         if (bytes_read > iso9660->entry_bytes_remaining)
 428                 bytes_read = iso9660->entry_bytes_remaining;
 429         *size = bytes_read;
 430         *offset = iso9660->entry_sparse_offset;
 431         iso9660->entry_sparse_offset += bytes_read;
 432         iso9660->entry_bytes_remaining -= bytes_read;
 433         iso9660->current_position += bytes_read;
 434         (a->compression_read_consume)(a, bytes_read);
 435         return (ARCHIVE_OK);
 436 }
 437
 438 static int
 439 archive_read_format_iso9660_cleanup(struct archive *a)
 440 {
 441         struct iso9660 *iso9660;
 442         struct file_info *file;
 443
 444         iso9660 = *(a->pformat_data);
 445         while ((file = next_entry(iso9660)) != NULL)
 446                 release_file(iso9660, file);
 447         archive_string_free(&iso9660->pathname);
 448         archive_string_free(&iso9660->previous_pathname);
 449         free(iso9660);
 450         *(a->pformat_data) = NULL;
 451         return (ARCHIVE_OK);
 452 }
 453
 454 /*
 455  * This routine parses a single ISO directory record, makes sense
 456  * of any extensions, and stores the result in memory.
 457  */
 458 static struct file_info *
 459 parse_file_info(struct iso9660 *iso9660, struct file_info *parent,
 460     const struct iso9660_directory_record *isodirrec)
 461 {
 462         struct file_info *file;
 463
 464         /* TODO: Sanity check that name_len doesn't exceed length, etc. */
 465
 466         /* Create a new file entry and copy data from the ISO dir record. */
 467         file = malloc(sizeof(*file));
 468         memset(file, 0, sizeof(*file));
 469         file->parent = parent;
 470         if (parent != NULL)
 471                 parent->refcount++;
 472         file->offset = toi(isodirrec->extent, 4)
 473             * iso9660->logical_block_size;
 474         file->size = toi(isodirrec->size, 4);
 475         file->mtime = isodate7(isodirrec->date);
 476         file->ctime = file->atime = file->mtime;
 477         file->name = malloc(isodirrec->name_len[0] + 1);
 478         memcpy(file->name, isodirrec->name, isodirrec->name_len[0]);
 479         file->name[(int)isodirrec->name_len[0]] = '\0';
 480         if (isodirrec->flags[0] & 0x02)
 481                 file->mode = S_IFDIR | 0700;
 482         else
 483                 file->mode = S_IFREG | 0400;
 484
 485         /* Rockridge extensions overwrite information from above. */
 486         {
 487                 const unsigned char *rr_start, *rr_end;
 488                 rr_end = (const unsigned char *)isodirrec
 489                     + isodirrec->length[0];
 490                 rr_start = isodirrec->name + isodirrec->name_len[0];
 491                 if ((isodirrec->name_len[0] & 1) == 0)
 492                         rr_start++;
 493                 rr_start += iso9660->suspOffset;
 494                 parse_rockridge(iso9660, file, rr_start, rr_end);
 495         }
 496
 497         /* DEBUGGING: Warn about attributes I don't yet fully support. */
 498         if ((isodirrec->flags[0] & ~0x02) != 0) {
 499                 fprintf(stderr, "\n ** Unrecognized flag: ");
 500                 dump_isodirrec(stderr, isodirrec);
 501                 fprintf(stderr, "\n");
 502         } else if (toi(isodirrec->volume_sequence_number, 2) != 1) {
 503                 fprintf(stderr, "\n ** Unrecognized sequence number: ");
 504                 dump_isodirrec(stderr, isodirrec);
 505                 fprintf(stderr, "\n");
 506         } else if (isodirrec->file_unit_size[0] != 0) {
 507                 fprintf(stderr, "\n ** Unexpected file unit size: ");
 508                 dump_isodirrec(stderr, isodirrec);
 509                 fprintf(stderr, "\n");
 510         } else if (isodirrec->interleave[0] != 0) {
 511                 fprintf(stderr, "\n ** Unexpected interleave: ");
 512                 dump_isodirrec(stderr, isodirrec);
 513                 fprintf(stderr, "\n");
 514         } else if (isodirrec->ext_attr_length[0] != 0) {
 515                 fprintf(stderr, "\n ** Unexpected extended attribute length: ");
 516                 dump_isodirrec(stderr, isodirrec);
 517                 fprintf(stderr, "\n");
 518         }
 519
 520         return (file);
 521 }
 522
 523 static void
 524 add_entry(struct iso9660 *iso9660, struct file_info *file)
 525 {
 526         /* Expand our pending files list as necessary. */
 527         if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
 528                 struct file_info **new_pending_files;
 529                 int new_size = iso9660->pending_files_allocated * 2;
 530
 531                 if (new_size < 1024)
 532                         new_size = 1024;
 533                 new_pending_files = malloc(new_size * sizeof(new_pending_files[0]));
 534                 memcpy(new_pending_files, iso9660->pending_files,
 535                     iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
 536                 if (iso9660->pending_files != NULL)
 537                         free(iso9660->pending_files);
 538                 iso9660->pending_files = new_pending_files;
 539                 iso9660->pending_files_allocated = new_size;
 540         }
 541
 542         iso9660->pending_files[iso9660->pending_files_used++] = file;
 543 }
 544
 545 static void
 546 parse_rockridge(struct iso9660 *iso9660, struct file_info *file,
 547     const unsigned char *p, const unsigned char *end)
 548 {
 549         (void)iso9660; /* UNUSED */
 550
 551         while (p + 4 < end  /* Enough space for another entry. */
 552             && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
 553             && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
 554             && p + p[2] <= end) { /* Sanity-check length. */
 555                 const unsigned char *data = p + 4;
 556                 int data_length = p[2] - 4;
 557                 int version = p[3];
 558
 559                 /*
 560                  * Yes, each 'if' here does test p[0] again.
 561                  * Otherwise, the fall-through handling to catch
 562                  * unsupported extensions doesn't work.
 563                  */
 564                 switch(p[0]) {
 565                 case 'C':
 566                         if (p[0] == 'C' && p[1] == 'E' && version == 1) {
 567                                 /*
 568                                  * CE extension comprises:
 569                                  *   8 byte sector containing extension
 570                                  *   8 byte offset w/in above sector
 571                                  *   8 byte length of continuation
 572                                  */
 573                                 file->ce_offset = toi(data, 4)
 574                                     * iso9660->logical_block_size
 575                                     + toi(data + 8, 4);
 576                                 file->ce_size = toi(data + 16, 4);
 577                                 break;
 578                         }
 579                         /* FALLTHROUGH */
 580                 case 'N':
 581                         if (p[0] == 'N' && p[1] == 'M' && version == 1
 582                                 && *data == 0) {
 583                                 /* NM extension with flag byte == 0 */
 584                                 /*
 585                                  * NM extension comprises:
 586                                  *   one byte flag
 587                                  *   rest is long name
 588                                  */
 589                                 /* TODO: Obey flags. */
 590                                 char *old_name = file->name;
 591
 592                                 data++;  /* Skip flag byte. */
 593                                 data_length--;
 594                                 file->name = malloc(data_length + 1);
 595                                 if (file->name != NULL) {
 596                                         free(old_name);
 597                                         memcpy(file->name, data, data_length);
 598                                         file->name[data_length] = '\0';
 599                                 } else
 600                                         file->name = old_name;
 601                                 break;
 602                         }
 603                         /* FALLTHROUGH */
 604                 case 'P':
 605                         if (p[0] == 'P' && p[1] == 'D' && version == 1) {
 606                                 /*
 607                                  * PD extension is padding;
 608                                  * contents are always ignored.
 609                                  */
 610                                 break;
 611                         }
 612                         if (p[0] == 'P' && p[1] == 'X' && version == 1) {
 613                                 /*
 614                                  * PX extension comprises:
 615                                  *   8 bytes for mode,
 616                                  *   8 bytes for nlinks,
 617                                  *   8 bytes for uid,
 618                                  *   8 bytes for gid,
 619                                  *   8 bytes for inode.
 620                                  */
 621                                 if (data_length == 32) {
 622                                         file->mode = toi(data, 4);
 623                                         file->nlinks = toi(data + 8, 4);
 624                                         file->uid = toi(data + 16, 4);
 625                                         file->gid = toi(data + 24, 4);
 626                                         file->inode = toi(data + 32, 4);
 627                                 }
 628                                 break;
 629                         }
 630                         /* FALLTHROUGH */
 631                 case 'R':
 632                         if (p[0] == 'R' && p[1] == 'R' && version == 1) {
 633                                 iso9660->seenRockridge = 1;
 634                                 /*
 635                                  * RR extension comprises:
 636                                  *    one byte flag value
 637                                  */
 638                                 /* TODO: Handle RR extension. */
 639                                 break;
 640                         }
 641                         /* FALLTHROUGH */
 642                 case 'S':
 643                         if (p[0] == 'S' && p[1] == 'L' && version == 1
 644                             && *data == 0) {
 645                                 int cont = 1;
 646                                 /* SL extension with flags == 0 */
 647                                 /* TODO: handle non-zero flag values. */
 648                                 data++;  /* Skip flag byte. */
 649                                 data_length--;
 650                                 while (data_length > 0) {
 651                                         unsigned char flag = *data++;
 652                                         unsigned char nlen = *data++;
 653                                         data_length -= 2;
 654
 655                                         if (cont == 0)
 656                                                 archive_strcat(&file->symlink, "/");
 657                                         cont = 0;
 658
 659                                         switch(flag) {
 660                                         case 0x01: /* Continue */
 661                                                 archive_strncat(&file->symlink, data, nlen);
 662                                                 cont = 1;
 663                                                 break;
 664                                         case 0x02: /* Current */
 665                                                 archive_strcat(&file->symlink, ".");
 666                                                 break;
 667                                         case 0x04: /* Parent */
 668                                                 archive_strcat(&file->symlink, "..");
 669                                                 break;
 670                                         case 0x08: /* Root */
 671                                         case 0x10: /* Volume root */
 672                                                 archive_string_empty(&file->symlink);
 673                                                 break;
 674                                         case 0x20: /* Hostname */
 675                                                 archive_strcat(&file->symlink, "hostname");
 676                                                 break;
 677                                         case 0:
 678                                                 archive_strncat(&file->symlink, data, nlen);
 679                                                 break;
 680                                         default:
 681                                                 /* TODO: issue a warning ? */
 682                                                 break;
 683                                         }
 684                                         data += nlen;
 685                                         data_length -= nlen;
 686                                 }
 687                                 break;
 688                         }
 689                         if (p[0] == 'S' && p[1] == 'P'
 690                             && version == 1 && data_length == 7
 691                             && data[0] == (unsigned char)'\xbe'
 692                             && data[1] == (unsigned char)'\xef') {
 693                                 /*
 694                                  * SP extension stores the suspOffset
 695                                  * (Number of bytes to skip between
 696                                  * filename and SUSP records.)
 697                                  * It is mandatory by the SUSP standard
 698                                  * (IEEE 1281).
 699                                  *
 700                                  * It allows SUSP to coexist with
 701                                  * non-SUSP uses of the System
 702                                  * Use Area by placing non-SUSP data
 703                                  * before SUSP data.
 704                                  *
 705                                  * TODO: Add a check for 'SP' in
 706                                  * first directory entry, disable all SUSP
 707                                  * processing if not found.
 708                                  */
 709                                 iso9660->suspOffset = data[2];
 710                                 break;
 711                         }
 712                         if (p[0] == 'S' && p[1] == 'T'
 713                             && data_length == 0 && version == 1) {
 714                                 /*
 715                                  * ST extension marks end of this
 716                                  * block of SUSP entries.
 717                                  *
 718                                  * It allows SUSP to coexist with
 719                                  * non-SUSP uses of the System
 720                                  * Use Area by placing non-SUSP data
 721                                  * after SUSP data.
 722                                  */
 723                                 return;
 724                         }
 725                 case 'T':
 726                         if (p[0] == 'T' && p[1] == 'F' && version == 1) {
 727                                 char flag = data[0];
 728                                 /*
 729                                  * TF extension comprises:
 730                                  *   one byte flag
 731                                  *   create time (optional)
 732                                  *   modify time (optional)
 733                                  *   access time (optional)
 734                                  *   attribute time (optional)
 735                                  *  Time format and presence of fields
 736                                  *  is controlled by flag bits.
 737                                  */
 738                                 data++;
 739                                 if (flag & 0x80) {
 740                                         /* Use 17-byte time format. */
 741                                         if (flag & 1) /* Create time. */
 742                                                 data += 17;
 743                                         if (flag & 2) { /* Modify time. */
 744                                                 file->mtime = isodate17(data);
 745                                                 data += 17;
 746                                         }
 747                                         if (flag & 4) { /* Access time. */
 748                                                 file->atime = isodate17(data);
 749                                                 data += 17;
 750                                         }
 751                                         if (flag & 8) { /* Attribute time. */
 752                                                 file->ctime = isodate17(data);
 753                                                 data += 17;
 754                                         }
 755                                 } else {
 756                                         /* Use 7-byte time format. */
 757                                         if (flag & 1) /* Create time. */
 758                                                 data += 7;
 759                                         if (flag & 2) { /* Modify time. */
 760                                                 file->mtime = isodate7(data);
 761                                                 data += 7;
 762                                         }
 763                                         if (flag & 4) { /* Access time. */
 764                                                 file->atime = isodate7(data);
 765                                                 data += 7;
 766                                         }
 767                                         if (flag & 8) { /* Attribute time. */
 768                                                 file->ctime = isodate7(data);
 769                                                 data += 7;
 770                                         }
 771                                 }
 772                                 break;
 773                         }
 774                         /* FALLTHROUGH */
 775                 default:
 776                         /* The FALLTHROUGHs above leave us here for
 777                          * any unsupported extension. */
 778                         {
 779                                 const unsigned char *t;
 780                                 fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name);
 781                                 fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length);
 782                                 for (t = data; t < data + data_length && t < data + 16; t++)
 783                                         fprintf(stderr, " %02x", *t);
 784                                 fprintf(stderr, "\n");
 785                         }
 786                 }
 787
 788
 789
 790                 p += p[2];
 791         }
 792 }
 793
 794 static void
 795 release_file(struct iso9660 *iso9660, struct file_info *file)
 796 {
 797         struct file_info *parent;
 798
 799         if (file->refcount == 0) {
 800                 parent = file->parent;
 801                 if (file->name)
 802                         free(file->name);
 803                 archive_string_free(&file->symlink);
 804                 free(file);
 805                 if (parent != NULL) {
 806                         parent->refcount--;
 807                         release_file(iso9660, parent);
 808                 }
 809         }
 810 }
 811
 812 static int
 813 next_entry_seek(struct archive *a, struct iso9660 *iso9660,
 814     struct file_info **pfile)
 815 {
 816         struct file_info *file;
 817         uint64_t offset;
 818
 819         *pfile = NULL;
 820         for (;;) {
 821                 *pfile = file = next_entry(iso9660);
 822                 if (file == NULL)
 823                         return (ARCHIVE_EOF);
 824
 825                 /* CE area precedes actual file data? Ignore it. */
 826                 if (file->ce_offset > file->offset) {
 827 fprintf(stderr, " *** Discarding CE data.\n");
 828                         file->ce_offset = 0;
 829                         file->ce_size = 0;
 830                 }
 831
 832                 /* If CE exists, find and read it now. */
 833                 if (file->ce_offset > 0)
 834                         offset = file->ce_offset;
 835                 else
 836                         offset = file->offset;
 837
 838                 /* Seek forward to the start of the entry. */
 839                 while (iso9660->current_position < offset) {
 840                         ssize_t step = offset - iso9660->current_position;
 841                         ssize_t bytes_read;
 842                         const void *buff;
 843
 844                         if (step > iso9660->logical_block_size)
 845                                 step = iso9660->logical_block_size;
 846                         bytes_read = (a->compression_read_ahead)(a, &buff, step);
 847                         if (bytes_read <= 0) {
 848                                 release_file(iso9660, file);
 849                                 return (ARCHIVE_FATAL);
 850                         }
 851                         if (bytes_read > step)
 852                                 bytes_read = step;
 853                         iso9660->current_position += bytes_read;
 854                         (a->compression_read_consume)(a, bytes_read);
 855                 }
 856
 857                 /* We found body of file; handle it now. */
 858                 if (offset == file->offset)
 859                         return (ARCHIVE_OK);
 860
 861                 /* Found CE?  Process it and push the file back onto list. */
 862                 if (offset == file->ce_offset) {
 863                         const void *p;
 864                         ssize_t size = file->ce_size;
 865                         ssize_t bytes_read;
 866                         const unsigned char *rr_start;
 867
 868                         file->ce_offset = 0;
 869                         file->ce_size = 0;
 870                         bytes_read = (a->compression_read_ahead)(a, &p, size);
 871                         if (bytes_read > size)
 872                                 bytes_read = size;
 873                         rr_start = (const unsigned char *)p;
 874                         parse_rockridge(iso9660, file, rr_start,
 875                             rr_start + bytes_read);
 876                         (a->compression_read_consume)(a, bytes_read);
 877                         iso9660->current_position += bytes_read;
 878                         add_entry(iso9660, file);
 879                 }
 880         }
 881 }
 882
 883 static struct file_info *
 884 next_entry(struct iso9660 *iso9660)
 885 {
 886         int least_index;
 887         uint64_t least_end_offset;
 888         int i;
 889         struct file_info *r;
 890
 891         if (iso9660->pending_files_used < 1)
 892                 return (NULL);
 893
 894         /* Assume the first file in the list is the earliest on disk. */
 895         least_index = 0;
 896         least_end_offset = iso9660->pending_files[0]->offset
 897             + iso9660->pending_files[0]->size;
 898
 899         /* Now, try to find an earlier one. */
 900         for(i = 0; i < iso9660->pending_files_used; i++) {
 901                 /* Use the position of the file *end* as our comparison. */
 902                 uint64_t end_offset = iso9660->pending_files[i]->offset
 903                     + iso9660->pending_files[i]->size;
 904                 if (iso9660->pending_files[i]->ce_offset > 0
 905                     && iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset)
 906                         end_offset = iso9660->pending_files[i]->ce_offset
 907                     + iso9660->pending_files[i]->ce_size;
 908                 if (least_end_offset > end_offset) {
 909                         least_index = i;
 910                         least_end_offset = end_offset;
 911                 }
 912         }
 913         r = iso9660->pending_files[least_index];
 914         iso9660->pending_files[least_index]
 915             = iso9660->pending_files[--iso9660->pending_files_used];
 916         return (r);
 917 }
 918
 919 static int
 920 toi(const void *p, int n)
 921 {
 922         const unsigned char *v = (const unsigned char *)p;
 923         if (n > 1)
 924                 return v[0] + 256 * toi(v + 1, n - 1);
 925         if (n == 1)
 926                 return v[0];
 927         return (0);
 928 }
 929
 930 static time_t
 931 isodate7(const void *p)
 932 {
 933         struct tm tm;
 934         const unsigned char *v = (const unsigned char *)p;
 935         int offset;
 936         tm.tm_year = v[0];
 937         tm.tm_mon = v[1] - 1;
 938         tm.tm_mday = v[2];
 939         tm.tm_hour = v[3];
 940         tm.tm_min = v[4];
 941         tm.tm_sec = v[5];
 942         /* v[6] is the timezone offset, in 1/4-hour increments. */
 943         offset = ((const signed char *)p)[6];
 944         if (offset > -48 && offset < 52) {
 945                 tm.tm_hour -= offset / 4;
 946                 tm.tm_min -= (offset % 4) * 15;
 947         }
 948         return (timegm(&tm));
 949 }
 950
 951 static time_t
 952 isodate17(const void *p)
 953 {
 954         struct tm tm;
 955         const unsigned char *v = (const unsigned char *)p;
 956         int offset;
 957         tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
 958             + (v[2] - '0') * 10 + (v[3] - '0')
 959             - 1900;
 960         tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
 961         tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
 962         tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
 963         tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
 964         tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
 965         /* v[16] is the timezone offset, in 1/4-hour increments. */
 966         offset = ((const signed char *)p)[16];
 967         if (offset > -48 && offset < 52) {
 968                 tm.tm_hour -= offset / 4;
 969                 tm.tm_min -= (offset % 4) * 15;
 970         }
 971         return (timegm(&tm));
 972 }
 973
 974 static const char *
 975 build_pathname(struct archive_string *as, struct file_info *file)
 976 {
 977         if (file->parent != NULL && file->parent->name[0] != '\0') {
 978                 build_pathname(as, file->parent);
 979                 archive_strcat(as, "/");
 980         }
 981         if (file->name[0] == '\0')
 982                 archive_strcat(as, ".");
 983         else
 984                 archive_strcat(as, file->name);
 985         return (as->s);
 986 }
 987
 988 static void
 989 dump_isodirrec(FILE *out, const struct iso9660_directory_record *isodirrec)
 990 {
 991         fprintf(out, " l %d,", isodirrec->length[0]);
 992         fprintf(out, " a %d,", isodirrec->ext_attr_length[0]);
 993         fprintf(out, " ext 0x%x,", toi(isodirrec->extent, 4));
 994         fprintf(out, " s %d,", toi(isodirrec->size, 4));
 995         fprintf(out, " f 0x%02x,", isodirrec->flags[0]);
 996         fprintf(out, " u %d,", isodirrec->file_unit_size[0]);
 997         fprintf(out, " ilv %d,", isodirrec->interleave[0]);
 998         fprintf(out, " seq %d,", toi(isodirrec->volume_sequence_number,2));
 999         fprintf(out, " nl %d:", isodirrec->name_len[0]);
1000         fprintf(out, " `%.*s'", isodirrec->name_len[0], isodirrec->name);
1001 }