contrib/libarchive-1.3.1/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 1.13 2006/03/21 16:55:46 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  * Our private data.
 126  */
 127
 128 /* In-memory storage for a directory record. */
 129 struct file_info {
 130         struct file_info        *parent;
 131         int              refcount;
 132         uint64_t         offset;  /* Offset on disk. */
 133         uint64_t         size;  /* File size in bytes. */
 134         uint64_t         ce_offset; /* Offset of CE */
 135         uint64_t         ce_size; /* Size of CE */
 136         time_t           mtime; /* File last modified time. */
 137         time_t           atime; /* File last accessed time. */
 138         time_t           ctime; /* File creation time. */
 139         mode_t           mode;
 140         uid_t            uid;
 141         gid_t            gid;
 142         ino_t            inode;
 143         int              nlinks;
 144         char            *name; /* Null-terminated filename. */
 145         struct archive_string symlink;
 146 };
 147
 148
 149 struct iso9660 {
 150         int     magic;
 151 #define ISO9660_MAGIC   0x96609660
 152         int     bid; /* If non-zero, return this as our bid. */
 153         struct archive_string pathname;
 154         char    seenRockridge; /* Set true if RR extensions are used. */
 155         unsigned char   suspOffset;
 156
 157         uint64_t        previous_offset;
 158         uint64_t        previous_size;
 159         struct archive_string previous_pathname;
 160
 161         /* TODO: Make this a heap for fast inserts and deletions. */
 162         struct file_info **pending_files;
 163         int     pending_files_allocated;
 164         int     pending_files_used;
 165
 166         uint64_t current_position;
 167         ssize_t logical_block_size;
 168
 169         off_t   entry_sparse_offset;
 170         ssize_t entry_bytes_remaining;
 171 };
 172
 173 static void     add_entry(struct iso9660 *iso9660, struct file_info *file);
 174 static int      archive_read_format_iso9660_bid(struct archive *);
 175 static int      archive_read_format_iso9660_cleanup(struct archive *);
 176 static int      archive_read_format_iso9660_read_data(struct archive *,
 177                     const void **, size_t *, off_t *);
 178 static int      archive_read_format_iso9660_read_header(struct archive *,
 179                     struct archive_entry *);
 180 static const char *build_pathname(struct archive_string *, struct file_info *);
 181 static void     dump_isodirrec(FILE *, const struct iso9660_directory_record *);
 182 static time_t   time_from_tm(struct tm *);
 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         if (iso9660 == NULL) {
 207                 archive_set_error(a, ENOMEM, "Can't allocate iso9660 data");
 208                 return (ARCHIVE_FATAL);
 209         }
 210         memset(iso9660, 0, sizeof(*iso9660));
 211         iso9660->magic = ISO9660_MAGIC;
 212         iso9660->bid = -1; /* We haven't yet bid. */
 213
 214         r = __archive_read_register_format(a,
 215             iso9660,
 216             archive_read_format_iso9660_bid,
 217             archive_read_format_iso9660_read_header,
 218             archive_read_format_iso9660_read_data,
 219             NULL,
 220             archive_read_format_iso9660_cleanup);
 221
 222         if (r != ARCHIVE_OK) {
 223                 free(iso9660);
 224                 return (r);
 225         }
 226         return (ARCHIVE_OK);
 227 }
 228
 229
 230 static int
 231 archive_read_format_iso9660_bid(struct archive *a)
 232 {
 233         struct iso9660 *iso9660;
 234         ssize_t bytes_read;
 235         const void *h;
 236         const char *p;
 237
 238         iso9660 = *(a->pformat_data);
 239
 240         if (iso9660->bid >= 0)
 241                 return (iso9660->bid);
 242
 243         /*
 244          * Skip the first 32k (reserved area) and get the first
 245          * 8 sectors of the volume descriptor table.  Of course,
 246          * if the I/O layer gives us more, we'll take it.
 247          */
 248         bytes_read = (a->compression_read_ahead)(a, &h, 32768 + 8*2048);
 249         if (bytes_read < 32768 + 8*2048)
 250             return (iso9660->bid = -1);
 251         p = (const char *)h;
 252
 253         /* Skip the reserved area. */
 254         bytes_read -= 32768;
 255         p += 32768;
 256
 257         /* Check each volume descriptor to locate the PVD. */
 258         for (; bytes_read > 2048; bytes_read -= 2048, p += 2048) {
 259                 iso9660->bid = isPVD(iso9660, p);
 260                 if (iso9660->bid > 0)
 261                         return (iso9660->bid);
 262                 if (*p == '\xff') /* End-of-volume-descriptor marker. */
 263                         break;
 264         }
 265
 266         /* We didn't find a valid PVD; return a bid of zero. */
 267         iso9660->bid = 0;
 268         return (iso9660->bid);
 269 }
 270
 271 static int
 272 isPVD(struct iso9660 *iso9660, const char *h)
 273 {
 274         const struct iso9660_primary_volume_descriptor *voldesc;
 275         struct file_info *file;
 276
 277         if (h[0] != 1)
 278                 return (0);
 279         if (memcmp(h+1, "CD001", 5) != 0)
 280                 return (0);
 281
 282
 283         voldesc = (const struct iso9660_primary_volume_descriptor *)h;
 284         iso9660->logical_block_size = toi(&voldesc->logical_block_size, 2);
 285
 286         /* Store the root directory in the pending list. */
 287         file = parse_file_info(iso9660, NULL,
 288             (struct iso9660_directory_record *)&voldesc->root_directory_record);
 289         add_entry(iso9660, file);
 290         return (48);
 291 }
 292
 293 static int
 294 archive_read_format_iso9660_read_header(struct archive *a,
 295     struct archive_entry *entry)
 296 {
 297         struct stat st;
 298         struct iso9660 *iso9660;
 299         struct file_info *file;
 300         ssize_t bytes_read;
 301         int r;
 302
 303         iso9660 = *(a->pformat_data);
 304
 305         if (!a->archive_format) {
 306                 a->archive_format = ARCHIVE_FORMAT_ISO9660;
 307                 a->archive_format_name = "ISO9660";
 308         }
 309
 310         /* Get the next entry that appears after the current offset. */
 311         r = next_entry_seek(a, iso9660, &file);
 312         if (r != ARCHIVE_OK)
 313                 return (r);
 314
 315         iso9660->entry_bytes_remaining = file->size;
 316         iso9660->entry_sparse_offset = 0; /* Offset for sparse-file-aware clients. */
 317
 318         /* Set up the entry structure with information about this entry. */
 319         memset(&st, 0, sizeof(st));
 320         st.st_mode = file->mode;
 321         st.st_uid = file->uid;
 322         st.st_gid = file->gid;
 323         st.st_nlink = file->nlinks;
 324         st.st_ino = file->inode;
 325         st.st_mtime = file->mtime;
 326         st.st_ctime = file->ctime;
 327         st.st_atime = file->atime;
 328         st.st_size = iso9660->entry_bytes_remaining;
 329         archive_entry_copy_stat(entry, &st);
 330         archive_string_empty(&iso9660->pathname);
 331         archive_entry_set_pathname(entry,
 332             build_pathname(&iso9660->pathname, file));
 333         if (file->symlink.s != NULL)
 334                 archive_entry_set_symlink(entry, file->symlink.s);
 335
 336         /* If this entry points to the same data as the previous
 337          * entry, convert this into a hardlink to that entry.
 338          * But don't bother for zero-length files. */
 339         if (file->offset == iso9660->previous_offset
 340             && file->size == iso9660->previous_size
 341             && file->size > 0) {
 342                 archive_entry_set_hardlink(entry,
 343                     iso9660->previous_pathname.s);
 344                 iso9660->entry_bytes_remaining = 0;
 345                 iso9660->entry_sparse_offset = 0;
 346                 release_file(iso9660, file);
 347                 return (ARCHIVE_OK);
 348         }
 349
 350         /* If the offset is before our current position, we can't
 351          * seek backwards to extract it, so issue a warning. */
 352         if (file->offset < iso9660->current_position) {
 353                 archive_set_error(a, ARCHIVE_ERRNO_MISC,
 354                     "Ignoring out-of-order file");
 355                 iso9660->entry_bytes_remaining = 0;
 356                 iso9660->entry_sparse_offset = 0;
 357                 release_file(iso9660, file);
 358                 return (ARCHIVE_WARN);
 359         }
 360
 361         iso9660->previous_size = file->size;
 362         iso9660->previous_offset = file->offset;
 363         archive_strcpy(&iso9660->previous_pathname, iso9660->pathname.s);
 364
 365         /* If this is a directory, read in all of the entries right now. */
 366         if (S_ISDIR(st.st_mode)) {
 367                 while (iso9660->entry_bytes_remaining > 0) {
 368                         const void *block;
 369                         const unsigned char *p;
 370                         ssize_t step = iso9660->logical_block_size;
 371                         if (step > iso9660->entry_bytes_remaining)
 372                                 step = iso9660->entry_bytes_remaining;
 373                         bytes_read = (a->compression_read_ahead)(a, &block, step);
 374                         if (bytes_read < step) {
 375                                 archive_set_error(a, ARCHIVE_ERRNO_MISC,
 376             "Failed to read full block when scanning ISO9660 directory list");
 377                                 release_file(iso9660, file);
 378                                 return (ARCHIVE_FATAL);
 379                         }
 380                         if (bytes_read > step)
 381                                 bytes_read = step;
 382                         (a->compression_read_consume)(a, bytes_read);
 383                         iso9660->current_position += bytes_read;
 384                         iso9660->entry_bytes_remaining -= bytes_read;
 385                         for (p = block;
 386                              *p != 0 && p < (const unsigned char *)block + bytes_read;
 387                              p += *p) {
 388                                 const struct iso9660_directory_record *dr
 389                                     = (const struct iso9660_directory_record *)p;
 390                                 struct file_info *child;
 391
 392                                 /* Skip '.' entry. */
 393                                 if (dr->name_len[0] == 1
 394                                     && dr->name[0] == '\0')
 395                                         continue;
 396                                 /* Skip '..' entry. */
 397                                 if (dr->name_len[0] == 1
 398                                     && dr->name[0] == '\001')
 399                                         continue;
 400                                 child = parse_file_info(iso9660, file, dr);
 401                                 add_entry(iso9660, child);
 402                                 if (iso9660->seenRockridge) {
 403                                         a->archive_format =
 404                                             ARCHIVE_FORMAT_ISO9660_ROCKRIDGE;
 405                                         a->archive_format_name =
 406                                             "ISO9660 with Rockridge extensions";
 407                                 }
 408                         }
 409                 }
 410         }
 411
 412         release_file(iso9660, file);
 413         return (ARCHIVE_OK);
 414 }
 415
 416 static int
 417 archive_read_format_iso9660_read_data(struct archive *a,
 418     const void **buff, size_t *size, off_t *offset)
 419 {
 420         ssize_t bytes_read;
 421         struct iso9660 *iso9660;
 422
 423         iso9660 = *(a->pformat_data);
 424         if (iso9660->entry_bytes_remaining <= 0) {
 425                 *buff = NULL;
 426                 *size = 0;
 427                 *offset = iso9660->entry_sparse_offset;
 428                 return (ARCHIVE_EOF);
 429         }
 430
 431         bytes_read = (a->compression_read_ahead)(a, buff, 1);
 432         if (bytes_read == 0)
 433                 archive_set_error(a, ARCHIVE_ERRNO_MISC,
 434                     "Truncated input file");
 435         if (bytes_read <= 0)
 436                 return (ARCHIVE_FATAL);
 437         if (bytes_read > iso9660->entry_bytes_remaining)
 438                 bytes_read = iso9660->entry_bytes_remaining;
 439         *size = bytes_read;
 440         *offset = iso9660->entry_sparse_offset;
 441         iso9660->entry_sparse_offset += bytes_read;
 442         iso9660->entry_bytes_remaining -= bytes_read;
 443         iso9660->current_position += bytes_read;
 444         (a->compression_read_consume)(a, bytes_read);
 445         return (ARCHIVE_OK);
 446 }
 447
 448 static int
 449 archive_read_format_iso9660_cleanup(struct archive *a)
 450 {
 451         struct iso9660 *iso9660;
 452         struct file_info *file;
 453
 454         iso9660 = *(a->pformat_data);
 455         while ((file = next_entry(iso9660)) != NULL)
 456                 release_file(iso9660, file);
 457         archive_string_free(&iso9660->pathname);
 458         archive_string_free(&iso9660->previous_pathname);
 459         free(iso9660);
 460         *(a->pformat_data) = NULL;
 461         return (ARCHIVE_OK);
 462 }
 463
 464 /*
 465  * This routine parses a single ISO directory record, makes sense
 466  * of any extensions, and stores the result in memory.
 467  */
 468 static struct file_info *
 469 parse_file_info(struct iso9660 *iso9660, struct file_info *parent,
 470     const struct iso9660_directory_record *isodirrec)
 471 {
 472         struct file_info *file;
 473
 474         /* TODO: Sanity check that name_len doesn't exceed length, etc. */
 475
 476         /* Create a new file entry and copy data from the ISO dir record. */
 477         file = malloc(sizeof(*file));
 478         if (file == NULL)
 479                 return (NULL);
 480         memset(file, 0, sizeof(*file));
 481         file->parent = parent;
 482         if (parent != NULL)
 483                 parent->refcount++;
 484         file->offset = toi(isodirrec->extent, 4)
 485             * iso9660->logical_block_size;
 486         file->size = toi(isodirrec->size, 4);
 487         file->mtime = isodate7(isodirrec->date);
 488         file->ctime = file->atime = file->mtime;
 489         file->name = malloc(isodirrec->name_len[0] + 1);
 490         if (file->name == NULL) {
 491                 free(file);
 492                 return (NULL);
 493         }
 494         memcpy(file->name, isodirrec->name, isodirrec->name_len[0]);
 495         file->name[(int)isodirrec->name_len[0]] = '\0';
 496         if (isodirrec->flags[0] & 0x02)
 497                 file->mode = S_IFDIR | 0700;
 498         else
 499                 file->mode = S_IFREG | 0400;
 500
 501         /* Rockridge extensions overwrite information from above. */
 502         {
 503                 const unsigned char *rr_start, *rr_end;
 504                 rr_end = (const unsigned char *)isodirrec
 505                     + isodirrec->length[0];
 506                 rr_start = (const unsigned char *)isodirrec->name
 507                     + isodirrec->name_len[0];
 508                 if ((isodirrec->name_len[0] & 1) == 0)
 509                         rr_start++;
 510                 rr_start += iso9660->suspOffset;
 511                 parse_rockridge(iso9660, file, rr_start, rr_end);
 512         }
 513
 514         /* DEBUGGING: Warn about attributes I don't yet fully support. */
 515         if ((isodirrec->flags[0] & ~0x02) != 0) {
 516                 fprintf(stderr, "\n ** Unrecognized flag: ");
 517                 dump_isodirrec(stderr, isodirrec);
 518                 fprintf(stderr, "\n");
 519         } else if (toi(isodirrec->volume_sequence_number, 2) != 1) {
 520                 fprintf(stderr, "\n ** Unrecognized sequence number: ");
 521                 dump_isodirrec(stderr, isodirrec);
 522                 fprintf(stderr, "\n");
 523         } else if (isodirrec->file_unit_size[0] != 0) {
 524                 fprintf(stderr, "\n ** Unexpected file unit size: ");
 525                 dump_isodirrec(stderr, isodirrec);
 526                 fprintf(stderr, "\n");
 527         } else if (isodirrec->interleave[0] != 0) {
 528                 fprintf(stderr, "\n ** Unexpected interleave: ");
 529                 dump_isodirrec(stderr, isodirrec);
 530                 fprintf(stderr, "\n");
 531         } else if (isodirrec->ext_attr_length[0] != 0) {
 532                 fprintf(stderr, "\n ** Unexpected extended attribute length: ");
 533                 dump_isodirrec(stderr, isodirrec);
 534                 fprintf(stderr, "\n");
 535         }
 536
 537         return (file);
 538 }
 539
 540 static void
 541 add_entry(struct iso9660 *iso9660, struct file_info *file)
 542 {
 543         /* Expand our pending files list as necessary. */
 544         if (iso9660->pending_files_used >= iso9660->pending_files_allocated) {
 545                 struct file_info **new_pending_files;
 546                 int new_size = iso9660->pending_files_allocated * 2;
 547
 548                 if (new_size < 1024)
 549                         new_size = 1024;
 550                 new_pending_files = malloc(new_size * sizeof(new_pending_files[0]));
 551                 if (new_pending_files == NULL)
 552                         __archive_errx(1, "Out of memory");
 553                 memcpy(new_pending_files, iso9660->pending_files,
 554                     iso9660->pending_files_allocated * sizeof(new_pending_files[0]));
 555                 if (iso9660->pending_files != NULL)
 556                         free(iso9660->pending_files);
 557                 iso9660->pending_files = new_pending_files;
 558                 iso9660->pending_files_allocated = new_size;
 559         }
 560
 561         iso9660->pending_files[iso9660->pending_files_used++] = file;
 562 }
 563
 564 static void
 565 parse_rockridge(struct iso9660 *iso9660, struct file_info *file,
 566     const unsigned char *p, const unsigned char *end)
 567 {
 568         (void)iso9660; /* UNUSED */
 569
 570         while (p + 4 < end  /* Enough space for another entry. */
 571             && p[0] >= 'A' && p[0] <= 'Z' /* Sanity-check 1st char of name. */
 572             && p[1] >= 'A' && p[1] <= 'Z' /* Sanity-check 2nd char of name. */
 573             && p + p[2] <= end) { /* Sanity-check length. */
 574                 const unsigned char *data = p + 4;
 575                 int data_length = p[2] - 4;
 576                 int version = p[3];
 577
 578                 /*
 579                  * Yes, each 'if' here does test p[0] again.
 580                  * Otherwise, the fall-through handling to catch
 581                  * unsupported extensions doesn't work.
 582                  */
 583                 switch(p[0]) {
 584                 case 'C':
 585                         if (p[0] == 'C' && p[1] == 'E' && version == 1) {
 586                                 /*
 587                                  * CE extension comprises:
 588                                  *   8 byte sector containing extension
 589                                  *   8 byte offset w/in above sector
 590                                  *   8 byte length of continuation
 591                                  */
 592                                 file->ce_offset = toi(data, 4)
 593                                     * iso9660->logical_block_size
 594                                     + toi(data + 8, 4);
 595                                 file->ce_size = toi(data + 16, 4);
 596                                 break;
 597                         }
 598                         /* FALLTHROUGH */
 599                 case 'N':
 600                         if (p[0] == 'N' && p[1] == 'M' && version == 1
 601                                 && *data == 0) {
 602                                 /* NM extension with flag byte == 0 */
 603                                 /*
 604                                  * NM extension comprises:
 605                                  *   one byte flag
 606                                  *   rest is long name
 607                                  */
 608                                 /* TODO: Obey flags. */
 609                                 char *old_name = file->name;
 610
 611                                 data++;  /* Skip flag byte. */
 612                                 data_length--;
 613                                 file->name = malloc(data_length + 1);
 614                                 if (file->name != NULL) {
 615                                         free(old_name);
 616                                         memcpy(file->name, data, data_length);
 617                                         file->name[data_length] = '\0';
 618                                 } else
 619                                         file->name = old_name;
 620                                 break;
 621                         }
 622                         /* FALLTHROUGH */
 623                 case 'P':
 624                         if (p[0] == 'P' && p[1] == 'D' && version == 1) {
 625                                 /*
 626                                  * PD extension is padding;
 627                                  * contents are always ignored.
 628                                  */
 629                                 break;
 630                         }
 631                         if (p[0] == 'P' && p[1] == 'X' && version == 1) {
 632                                 /*
 633                                  * PX extension comprises:
 634                                  *   8 bytes for mode,
 635                                  *   8 bytes for nlinks,
 636                                  *   8 bytes for uid,
 637                                  *   8 bytes for gid,
 638                                  *   8 bytes for inode.
 639                                  */
 640                                 if (data_length == 32) {
 641                                         file->mode = toi(data, 4);
 642                                         file->nlinks = toi(data + 8, 4);
 643                                         file->uid = toi(data + 16, 4);
 644                                         file->gid = toi(data + 24, 4);
 645                                         file->inode = toi(data + 32, 4);
 646                                 }
 647                                 break;
 648                         }
 649                         /* FALLTHROUGH */
 650                 case 'R':
 651                         if (p[0] == 'R' && p[1] == 'R' && version == 1) {
 652                                 iso9660->seenRockridge = 1;
 653                                 /*
 654                                  * RR extension comprises:
 655                                  *    one byte flag value
 656                                  */
 657                                 /* TODO: Handle RR extension. */
 658                                 break;
 659                         }
 660                         /* FALLTHROUGH */
 661                 case 'S':
 662                         if (p[0] == 'S' && p[1] == 'L' && version == 1
 663                             && *data == 0) {
 664                                 int cont = 1;
 665                                 /* SL extension with flags == 0 */
 666                                 /* TODO: handle non-zero flag values. */
 667                                 data++;  /* Skip flag byte. */
 668                                 data_length--;
 669                                 while (data_length > 0) {
 670                                         unsigned char flag = *data++;
 671                                         unsigned char nlen = *data++;
 672                                         data_length -= 2;
 673
 674                                         if (cont == 0)
 675                                                 archive_strcat(&file->symlink, "/");
 676                                         cont = 0;
 677
 678                                         switch(flag) {
 679                                         case 0x01: /* Continue */
 680                                                 archive_strncat(&file->symlink,
 681                                                     (const char *)data, nlen);
 682                                                 cont = 1;
 683                                                 break;
 684                                         case 0x02: /* Current */
 685                                                 archive_strcat(&file->symlink, ".");
 686                                                 break;
 687                                         case 0x04: /* Parent */
 688                                                 archive_strcat(&file->symlink, "..");
 689                                                 break;
 690                                         case 0x08: /* Root */
 691                                         case 0x10: /* Volume root */
 692                                                 archive_string_empty(&file->symlink);
 693                                                 break;
 694                                         case 0x20: /* Hostname */
 695                                                 archive_strcat(&file->symlink, "hostname");
 696                                                 break;
 697                                         case 0:
 698                                                 archive_strncat(&file->symlink,
 699                                                     (const char *)data, nlen);
 700                                                 break;
 701                                         default:
 702                                                 /* TODO: issue a warning ? */
 703                                                 break;
 704                                         }
 705                                         data += nlen;
 706                                         data_length -= nlen;
 707                                 }
 708                                 break;
 709                         }
 710                         if (p[0] == 'S' && p[1] == 'P'
 711                             && version == 1 && data_length == 7
 712                             && data[0] == (unsigned char)'\xbe'
 713                             && data[1] == (unsigned char)'\xef') {
 714                                 /*
 715                                  * SP extension stores the suspOffset
 716                                  * (Number of bytes to skip between
 717                                  * filename and SUSP records.)
 718                                  * It is mandatory by the SUSP standard
 719                                  * (IEEE 1281).
 720                                  *
 721                                  * It allows SUSP to coexist with
 722                                  * non-SUSP uses of the System
 723                                  * Use Area by placing non-SUSP data
 724                                  * before SUSP data.
 725                                  *
 726                                  * TODO: Add a check for 'SP' in
 727                                  * first directory entry, disable all SUSP
 728                                  * processing if not found.
 729                                  */
 730                                 iso9660->suspOffset = data[2];
 731                                 break;
 732                         }
 733                         if (p[0] == 'S' && p[1] == 'T'
 734                             && data_length == 0 && version == 1) {
 735                                 /*
 736                                  * ST extension marks end of this
 737                                  * block of SUSP entries.
 738                                  *
 739                                  * It allows SUSP to coexist with
 740                                  * non-SUSP uses of the System
 741                                  * Use Area by placing non-SUSP data
 742                                  * after SUSP data.
 743                                  */
 744                                 return;
 745                         }
 746                 case 'T':
 747                         if (p[0] == 'T' && p[1] == 'F' && version == 1) {
 748                                 char flag = data[0];
 749                                 /*
 750                                  * TF extension comprises:
 751                                  *   one byte flag
 752                                  *   create time (optional)
 753                                  *   modify time (optional)
 754                                  *   access time (optional)
 755                                  *   attribute time (optional)
 756                                  *  Time format and presence of fields
 757                                  *  is controlled by flag bits.
 758                                  */
 759                                 data++;
 760                                 if (flag & 0x80) {
 761                                         /* Use 17-byte time format. */
 762                                         if (flag & 1) /* Create time. */
 763                                                 data += 17;
 764                                         if (flag & 2) { /* Modify time. */
 765                                                 file->mtime = isodate17(data);
 766                                                 data += 17;
 767                                         }
 768                                         if (flag & 4) { /* Access time. */
 769                                                 file->atime = isodate17(data);
 770                                                 data += 17;
 771                                         }
 772                                         if (flag & 8) { /* Attribute time. */
 773                                                 file->ctime = isodate17(data);
 774                                                 data += 17;
 775                                         }
 776                                 } else {
 777                                         /* Use 7-byte time format. */
 778                                         if (flag & 1) /* Create time. */
 779                                                 data += 7;
 780                                         if (flag & 2) { /* Modify time. */
 781                                                 file->mtime = isodate7(data);
 782                                                 data += 7;
 783                                         }
 784                                         if (flag & 4) { /* Access time. */
 785                                                 file->atime = isodate7(data);
 786                                                 data += 7;
 787                                         }
 788                                         if (flag & 8) { /* Attribute time. */
 789                                                 file->ctime = isodate7(data);
 790                                                 data += 7;
 791                                         }
 792                                 }
 793                                 break;
 794                         }
 795                         /* FALLTHROUGH */
 796                 default:
 797                         /* The FALLTHROUGHs above leave us here for
 798                          * any unsupported extension. */
 799                         {
 800                                 const unsigned char *t;
 801                                 fprintf(stderr, "\nUnsupported RRIP extension for %s\n", file->name);
 802                                 fprintf(stderr, " %c%c(%d):", p[0], p[1], data_length);
 803                                 for (t = data; t < data + data_length && t < data + 16; t++)
 804                                         fprintf(stderr, " %02x", *t);
 805                                 fprintf(stderr, "\n");
 806                         }
 807                 }
 808
 809
 810
 811                 p += p[2];
 812         }
 813 }
 814
 815 static void
 816 release_file(struct iso9660 *iso9660, struct file_info *file)
 817 {
 818         struct file_info *parent;
 819
 820         if (file->refcount == 0) {
 821                 parent = file->parent;
 822                 if (file->name)
 823                         free(file->name);
 824                 archive_string_free(&file->symlink);
 825                 free(file);
 826                 if (parent != NULL) {
 827                         parent->refcount--;
 828                         release_file(iso9660, parent);
 829                 }
 830         }
 831 }
 832
 833 static int
 834 next_entry_seek(struct archive *a, struct iso9660 *iso9660,
 835     struct file_info **pfile)
 836 {
 837         struct file_info *file;
 838         uint64_t offset;
 839
 840         *pfile = NULL;
 841         for (;;) {
 842                 *pfile = file = next_entry(iso9660);
 843                 if (file == NULL)
 844                         return (ARCHIVE_EOF);
 845
 846                 /* CE area precedes actual file data? Ignore it. */
 847                 if (file->ce_offset > file->offset) {
 848 fprintf(stderr, " *** Discarding CE data.\n");
 849                         file->ce_offset = 0;
 850                         file->ce_size = 0;
 851                 }
 852
 853                 /* If CE exists, find and read it now. */
 854                 if (file->ce_offset > 0)
 855                         offset = file->ce_offset;
 856                 else
 857                         offset = file->offset;
 858
 859                 /* Seek forward to the start of the entry. */
 860                 while (iso9660->current_position < offset) {
 861                         ssize_t step = offset - iso9660->current_position;
 862                         ssize_t bytes_read;
 863                         const void *buff;
 864
 865                         if (step > iso9660->logical_block_size)
 866                                 step = iso9660->logical_block_size;
 867                         bytes_read = (a->compression_read_ahead)(a, &buff, step);
 868                         if (bytes_read <= 0) {
 869                                 release_file(iso9660, file);
 870                                 return (ARCHIVE_FATAL);
 871                         }
 872                         if (bytes_read > step)
 873                                 bytes_read = step;
 874                         iso9660->current_position += bytes_read;
 875                         (a->compression_read_consume)(a, bytes_read);
 876                 }
 877
 878                 /* We found body of file; handle it now. */
 879                 if (offset == file->offset)
 880                         return (ARCHIVE_OK);
 881
 882                 /* Found CE?  Process it and push the file back onto list. */
 883                 if (offset == file->ce_offset) {
 884                         const void *p;
 885                         ssize_t size = file->ce_size;
 886                         ssize_t bytes_read;
 887                         const unsigned char *rr_start;
 888
 889                         file->ce_offset = 0;
 890                         file->ce_size = 0;
 891                         bytes_read = (a->compression_read_ahead)(a, &p, size);
 892                         if (bytes_read > size)
 893                                 bytes_read = size;
 894                         rr_start = (const unsigned char *)p;
 895                         parse_rockridge(iso9660, file, rr_start,
 896                             rr_start + bytes_read);
 897                         (a->compression_read_consume)(a, bytes_read);
 898                         iso9660->current_position += bytes_read;
 899                         add_entry(iso9660, file);
 900                 }
 901         }
 902 }
 903
 904 static struct file_info *
 905 next_entry(struct iso9660 *iso9660)
 906 {
 907         int least_index;
 908         uint64_t least_end_offset;
 909         int i;
 910         struct file_info *r;
 911
 912         if (iso9660->pending_files_used < 1)
 913                 return (NULL);
 914
 915         /* Assume the first file in the list is the earliest on disk. */
 916         least_index = 0;
 917         least_end_offset = iso9660->pending_files[0]->offset
 918             + iso9660->pending_files[0]->size;
 919
 920         /* Now, try to find an earlier one. */
 921         for (i = 0; i < iso9660->pending_files_used; i++) {
 922                 /* Use the position of the file *end* as our comparison. */
 923                 uint64_t end_offset = iso9660->pending_files[i]->offset
 924                     + iso9660->pending_files[i]->size;
 925                 if (iso9660->pending_files[i]->ce_offset > 0
 926                     && iso9660->pending_files[i]->ce_offset < iso9660->pending_files[i]->offset)
 927                         end_offset = iso9660->pending_files[i]->ce_offset
 928                     + iso9660->pending_files[i]->ce_size;
 929                 if (least_end_offset > end_offset) {
 930                         least_index = i;
 931                         least_end_offset = end_offset;
 932                 }
 933         }
 934         r = iso9660->pending_files[least_index];
 935         iso9660->pending_files[least_index]
 936             = iso9660->pending_files[--iso9660->pending_files_used];
 937         return (r);
 938 }
 939
 940 static int
 941 toi(const void *p, int n)
 942 {
 943         const unsigned char *v = (const unsigned char *)p;
 944         if (n > 1)
 945                 return v[0] + 256 * toi(v + 1, n - 1);
 946         if (n == 1)
 947                 return v[0];
 948         return (0);
 949 }
 950
 951 static time_t
 952 isodate7(const void *p)
 953 {
 954         struct tm tm;
 955         const unsigned char *v = (const unsigned char *)p;
 956         int offset;
 957         memset(&tm, 0, sizeof(tm));
 958         tm.tm_year = v[0];
 959         tm.tm_mon = v[1] - 1;
 960         tm.tm_mday = v[2];
 961         tm.tm_hour = v[3];
 962         tm.tm_min = v[4];
 963         tm.tm_sec = v[5];
 964         /* v[6] is the timezone offset, in 1/4-hour increments. */
 965         offset = ((const signed char *)p)[6];
 966         if (offset > -48 && offset < 52) {
 967                 tm.tm_hour -= offset / 4;
 968                 tm.tm_min -= (offset % 4) * 15;
 969         }
 970         return (time_from_tm(&tm));
 971 }
 972
 973 static time_t
 974 isodate17(const void *p)
 975 {
 976         struct tm tm;
 977         const unsigned char *v = (const unsigned char *)p;
 978         int offset;
 979         memset(&tm, 0, sizeof(tm));
 980         tm.tm_year = (v[0] - '0') * 1000 + (v[1] - '0') * 100
 981             + (v[2] - '0') * 10 + (v[3] - '0')
 982             - 1900;
 983         tm.tm_mon = (v[4] - '0') * 10 + (v[5] - '0');
 984         tm.tm_mday = (v[6] - '0') * 10 + (v[7] - '0');
 985         tm.tm_hour = (v[8] - '0') * 10 + (v[9] - '0');
 986         tm.tm_min = (v[10] - '0') * 10 + (v[11] - '0');
 987         tm.tm_sec = (v[12] - '0') * 10 + (v[13] - '0');
 988         /* v[16] is the timezone offset, in 1/4-hour increments. */
 989         offset = ((const signed char *)p)[16];
 990         if (offset > -48 && offset < 52) {
 991                 tm.tm_hour -= offset / 4;
 992                 tm.tm_min -= (offset % 4) * 15;
 993         }
 994         return (time_from_tm(&tm));
 995 }
 996
 997 /*
 998  * timegm() converts a struct tm to a time_t, except it isn't standard,
 999  * so I provide my own function here that (ideally) is just a wrapper
1000  * for timegm().
1001  */
1002 static time_t
1003 time_from_tm(struct tm *t)
1004 {
1005 #if HAVE_TIMEGM
1006         return (timegm(t));
1007 #else
1008         /*
1009          * Unfortunately, timegm() isn't standard.  The standard
1010          * mktime() function is a close match, except that it uses
1011          * local timezone instead of GMT.  Close enough for now.
1012          * Note that it is not possible to emulate timegm() using
1013          * standard interfaces:
1014          *   * ANSI C90 does not even guarantee that time_t is
1015          *     an arithmetic type, so time adjustments can only be
1016          *     done by manipulating struct tm elements.  You cannot
1017          *     portably calculate time_t values.
1018          *   * POSIX does promise that time_t is an arithmetic type
1019          *     measured in seconds, so you can do time_t calculations
1020          *     while remaining POSIX-compliant.
1021          *   * Neither ANSI nor POSIX provides an easy way to measure
1022          *     the timezone offset, so you can't adjust mktime() to
1023          *     work like timegm().
1024          *   * POSIX does not promise that the epoch begins in 1970,
1025          *     so you can't write a portable timegm() function from
1026          *     scratch.
1027          */
1028         time_t result = mktime(t);
1029         /* TODO: Find a way to improve this approximation to timegm(). */
1030         return result;
1031 #endif
1032 }
1033
1034 static const char *
1035 build_pathname(struct archive_string *as, struct file_info *file)
1036 {
1037         if (file->parent != NULL && file->parent->name[0] != '\0') {
1038                 build_pathname(as, file->parent);
1039                 archive_strcat(as, "/");
1040         }
1041         if (file->name[0] == '\0')
1042                 archive_strcat(as, ".");
1043         else
1044                 archive_strcat(as, file->name);
1045         return (as->s);
1046 }
1047
1048 static void
1049 dump_isodirrec(FILE *out, const struct iso9660_directory_record *isodirrec)
1050 {
1051         fprintf(out, " l %d,", isodirrec->length[0]);
1052         fprintf(out, " a %d,", isodirrec->ext_attr_length[0]);
1053         fprintf(out, " ext 0x%x,", toi(isodirrec->extent, 4));
1054         fprintf(out, " s %d,", toi(isodirrec->size, 4));
1055         fprintf(out, " f 0x%02x,", isodirrec->flags[0]);
1056         fprintf(out, " u %d,", isodirrec->file_unit_size[0]);
1057         fprintf(out, " ilv %d,", isodirrec->interleave[0]);
1058         fprintf(out, " seq %d,", toi(isodirrec->volume_sequence_number,2));
1059         fprintf(out, " nl %d:", isodirrec->name_len[0]);
1060         fprintf(out, " `%.*s'", isodirrec->name_len[0], isodirrec->name);
1061 }