mdw@git.distorted.org.uk Git - dvdrip/blob - dvd-sector-copy.c

   1 #define _GNU_SOURCE
   2 #define _FILE_OFFSET_BITS 64
   3
   4 #include <assert.h>
   5 #include <ctype.h>
   6 #include <errno.h>
   7 #include <inttypes.h>
   8 #include <math.h>
   9 #include <stdarg.h>
  10 #include <stdint.h>
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include <string.h>
  14 #include <time.h>
  15
  16 #include <unistd.h>
  17 #include <fcntl.h>
  18 #include <sys/ioctl.h>
  19 #include <sys/stat.h>
  20 #include <sys/time.h>
  21
  22 #include <getopt.h>
  23
  24 #include <linux/fs.h>
  25
  26 #include <dvdread/dvd_reader.h>
  27 #include <dvdread/dvd_udf.h>
  28 #include <dvdread/ifo_read.h>
  29 #include <dvdread/ifo_types.h>
  30
  31 #define CTYPE_HACK(fn, ch) fn((unsigned char)(ch))
  32 #define ISDIGIT(ch) CTYPE_HACK(isdigit, ch)
  33 #define ISSPACE(ch) CTYPE_HACK(isspace, ch)
  34
  35 #ifdef DEBUG
  36 #  define D(x) x
  37 #else
  38 #  define D(x)
  39 #endif
  40
  41 #define N(v) (sizeof(v)/sizeof((v)[0]))
  42
  43 #define SECTORSZ 2048
  44 #define SECTORS(n) (((n) + (SECTORSZ - 1))/SECTORSZ)
  45
  46 static const char *prog = "<unset>";
  47 static int status = 0;
  48
  49 static void usage(FILE *fp)
  50 {
  51   fprintf(fp,
  52           "usage: %s [-c] [-R MAP] [-b OUTMAP] [-r [START]-[END]]\n"
  53           "\tDEVICE OUTFILE\n",
  54           prog);
  55 }
  56
  57 static void vmoan(const char *fmt, va_list ap)
  58   { fprintf(stderr, "%s: ", prog); vfprintf(stderr, fmt, ap); }
  59
  60 __attribute__((format(printf, 1, 2)))
  61 static void moan(const char *fmt, ...)
  62 {
  63   va_list ap;
  64
  65   va_start(ap, fmt); vmoan(fmt, ap); va_end(ap);
  66   fputc('\n', stderr);
  67 }
  68
  69 __attribute__((noreturn, format(printf, 1, 2)))
  70 static void bail(const char *fmt, ...)
  71 {
  72   va_list ap;
  73
  74   va_start(ap, fmt); vmoan(fmt, ap); va_end(ap);
  75   fputc('\n', stderr);
  76   exit(2);
  77 }
  78
  79 __attribute__((noreturn, format(printf, 2, 3)))
  80 static void bail_syserr(int err, const char *fmt, ...)
  81 {
  82   va_list ap;
  83
  84   va_start(ap, fmt); vmoan(fmt, ap); va_end(ap);
  85   if (err) fprintf(stderr, ": %s", strerror(errno));
  86   fputc('\n', stderr);
  87   exit(2);
  88 }
  89
  90 static void carefully_write(int fd, const void *buf, size_t sz)
  91 {
  92   const unsigned char *p = buf;
  93   ssize_t n;
  94
  95   if (fd < 0) return;
  96   while (sz) {
  97     n = write(fd, p, sz);
  98     if (n < 0) {
  99       if (errno == EINTR) continue;
 100       bail_syserr(errno, "failed to write to output file");
 101     }
 102     if (!n) bail("unexpected short write to output file");
 103     p += n; sz -= n;
 104   }
 105 }
 106
 107 static void open_file_on_demand(const char *file, FILE **fp_inout,
 108                                 const char *what)
 109 {
 110   FILE *fp;
 111
 112   if (!*fp_inout) {
 113     fp = fopen(file, "w");
 114     if (!fp)
 115       bail_syserr(errno, "failed to open %s file `%s'", what, file);
 116     fprintf(fp, "## %s\n\n", what);
 117     *fp_inout = fp;
 118   }
 119 }
 120
 121 static void check_write(FILE *fp, const char *what)
 122 {
 123   fflush(fp);
 124   if (ferror(fp)) bail_syserr(errno, "error writing %s file", what);
 125 }
 126
 127 static void carefully_fclose(FILE *fp, const char *what)
 128 {
 129   if (fp && (ferror(fp) || fclose(fp)))
 130     bail_syserr(errno, "error writing %s file", what);
 131 }
 132
 133 #define DEFVEC(vtype, etype)                                            \
 134         typedef struct { etype *v; size_t n, sz; } vtype
 135 #define VEC_INIT { 0, 0, 0 }
 136 #define VEC_FREE(vv) do {                                               \
 137   free((vv)->v); (vv)->v 0; (vv)->n = (vv)->sz = 0;                     \
 138 } while (0)
 139 #define VEC_PUSH(p, vv) do {                                            \
 140   size_t _want;                                                         \
 141   if ((vv)->n >= (vv)->sz) {                                            \
 142     (vv)->sz = (vv)->sz ? 2*(vv)->sz : 32;                              \
 143     _want = (vv)->sz*sizeof(*(vv)->v);                                  \
 144     (vv)->v = realloc((vv)->v, _want);                                  \
 145     if (!(vv)->v) bail("out of memory allocating %zu bytes", _want);    \
 146   }                                                                     \
 147   (p) = &(vv)->v[(vv)->n++];                                            \
 148 } while (0)
 149
 150 enum { RAW, IFO, VOB, BUP };
 151 typedef uint_least32_t ident;
 152
 153 static inline ident mkident(unsigned kind, unsigned title, unsigned part)
 154   { return (((ident)kind << 0) | ((ident)title << 8) | ((ident)part << 16)); }
 155 static inline unsigned id_kind(ident id) { return ((id >> 0)&0x0ff); }
 156 static inline unsigned id_title(ident id) { return ((id >> 8)&0x0ff); }
 157 static inline unsigned id_part(ident id) { return ((id >> 16)&0x0ff); }
 158
 159 #define MAXFNSZ (1 + 8 + 1 + 12 + 1)
 160
 161 static void store_filename(char *buf, ident id)
 162 {
 163   switch (id_kind(id)) {
 164     case RAW:
 165       sprintf(buf, "#<raw device>");
 166       break;
 167     case IFO:
 168       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.IFO");
 169       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.IFO", id_title(id));
 170       break;
 171     case BUP:
 172       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.BUP");
 173       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.BUP", id_title(id));
 174       break;
 175     case VOB:
 176       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.VOB");
 177       else
 178         sprintf(buf, "/VIDEO_TS/VTS_%02u_%u.VOB", id_title(id), id_part(id));
 179       break;
 180     default:
 181       abort();
 182   }
 183 }
 184
 185 typedef uint_least32_t secaddr;
 186 #define PRIuSEC PRIuLEAST32
 187 #define SECLIMIT 0x00400000
 188
 189 #define MAXFILES (1 + 2*99 + 1)
 190 struct file {
 191   ident id;
 192   secaddr start, end;
 193 };
 194 DEFVEC(file_v, struct file);
 195 static file_v filetab = VEC_INIT;
 196
 197 enum { EV_STOP, EV_BEGIN, EV_END, EV_WRITE };
 198 struct event {
 199   unsigned char ev, file;
 200   secaddr pos;
 201 };
 202 DEFVEC(event_v, struct event);
 203 static event_v eventq = VEC_INIT;
 204
 205 static int compare_event(const void *a, const void *b)
 206 {
 207   const struct event *eva = a, *evb = b;
 208
 209   if (eva->pos < evb->pos) return (-1);
 210   else if (eva->pos > evb->pos) return (+1);
 211
 212   if (eva->ev < evb->ev) return (-1);
 213   else if (eva->ev > evb->ev) return (+1);
 214
 215   if (eva->file < evb->file) return (-1);
 216   else if (eva->file > evb->file) return (+1);
 217
 218   return (0);
 219 }
 220
 221 typedef uint_least32_t bits;
 222 static bits live[(MAXFILES + 31)/32];
 223
 224 static inline int livep(unsigned i)
 225   { return (live[i/32]&((bits)1 << (i%32))); }
 226 static inline void set_live(unsigned i)
 227   { live[i/32] |= (bits)1 << (i%32); }
 228 static inline void clear_live(unsigned i)
 229   { live[i/32] &= ~((bits)1 << (i%32)); }
 230 static inline int least_live(void)
 231 {
 232   unsigned i, n = (filetab.n + 32)/32;
 233   bits b;
 234
 235   for (i = 0; i < n; i++) { b = live[i]; if (b) goto found; }
 236   return (-1);
 237 found:
 238   i *= 32;
 239   if (!(b&0x0000ffff)) { b >>= 16; i += 16; }
 240   if (!(b&0x000000ff)) { b >>=  8; i +=  8; }
 241   if (!(b&0x0000000f)) { b >>=  4; i +=  4; }
 242   if (!(b&0x00000003)) { b >>=  2; i +=  2; }
 243   if (!(b&0x00000001)) { b >>=  1; i +=  1; }
 244   assert(b&1);
 245   return (i);
 246 }
 247
 248 static void put_event(unsigned evtype, unsigned file, secaddr pos)
 249 {
 250   struct event *ev;
 251
 252   VEC_PUSH(ev, &eventq);
 253   ev->ev = evtype; ev->file = file; ev->pos = pos;
 254 }
 255
 256 static void put_file(ident id, secaddr start, secaddr end)
 257 {
 258   struct file *f;
 259   size_t i;
 260
 261   VEC_PUSH(f, &filetab); i = f - filetab.v;
 262   f->id = id; f->start = start; f->end = end;
 263   put_event(EV_BEGIN, i, start);
 264   put_event(EV_END, i, end);
 265 }
 266
 267 static void put_menu(dvd_reader_t *dvd, unsigned title)
 268 {
 269   ident id = mkident(VOB, title, 0);
 270   char fn[MAXFNSZ];
 271   secaddr start, len;
 272
 273   store_filename(fn, id);
 274   start = UDFFindFile(dvd, fn, &len); if (!start) return;
 275 #ifdef DEBUG
 276       printf(";; %8"PRIuSEC" .. %-8"PRIuSEC": %s\n",
 277              start, start + SECTORS(len), fn);
 278 #endif
 279   put_file(id, start, start + SECTORS(len));
 280 }
 281
 282 static void put_title(dvd_reader_t *dvd, unsigned title)
 283 {
 284   char fn[MAXFNSZ];
 285   secaddr start[9], len[9];
 286   unsigned i, npart;
 287
 288   for (i = 0; i < 9; i++) {
 289     store_filename(fn, mkident(VOB, title, i + 1));
 290     start[i] = UDFFindFile(dvd, fn, &len[i]); if (!start[i]) break;
 291   }
 292   npart = i; if (!npart) return;
 293
 294 #ifdef DEBUG
 295   for (i = 0; i < npart; i++) {
 296     store_filename(fn, mkident(VOB, title, i + 1));
 297     printf(";; %8"PRIuSEC" .. %-8"PRIuSEC": %s\n",
 298            start[i], start[i] + SECTORS(len[i]), fn);
 299   }
 300 #endif
 301
 302   if (npart > 1)
 303     for (i = 0; i < npart - 1; i++) {
 304       if (len[i]%SECTORSZ)
 305         bail("title %u part %u length = %"PRIuSEC" not a multiple of %d",
 306              title, i, len[i], SECTORSZ);
 307       if (start[i] + len[i]/SECTORSZ != start[i + 1])
 308         bail
 309           ("title %u part %u end = %"PRIuSEC" /= part %u start = %"PRIuSEC"",
 310            title, i, start[i] + len[i]/SECTORSZ, i + 1, start[i + 1]);
 311     }
 312
 313   put_file(mkident(VOB, title, 1),
 314            start[0], start[npart - 1] + SECTORS(len[npart - 1]));
 315 }
 316
 317 static int progresslen = 0;
 318
 319 static void clear_progress_internal(void)
 320 {
 321   while (progresslen) { fputs("\b \b", stdout); progresslen--; }
 322   putchar('\r');
 323 }
 324 static void clear_progress(void)
 325   { clear_progress_internal(); fflush(stdout); }
 326 #ifdef DEBUG
 327 static void debug_clear_progress(void)
 328   { if (progresslen) { putchar('\n'); progresslen = 0; } }
 329 #endif
 330 static void vappend_progress(const char *fmt, va_list ap)
 331   { progresslen += vprintf(fmt, ap); }
 332 __attribute__((format(printf, 1, 2)))
 333 static void append_progress(const char *fmt, ...)
 334 {
 335   va_list ap;
 336
 337   va_start(ap, fmt);
 338   vappend_progress(fmt, ap);
 339   va_end(ap);
 340 }
 341 __attribute__((format(printf, 1, 2)))
 342 static void print_progress(const char *fmt, ...)
 343 {
 344   va_list ap;
 345
 346   va_start(ap, fmt);
 347   clear_progress_internal();
 348   vappend_progress(fmt, ap);
 349   va_end(ap);
 350 }
 351
 352 unsigned flags;
 353 #  define F_ALLPROGRESS 1u
 354 static secaddr last_pos, limit, nsectors, ndone;
 355 static struct timeval last_time;
 356 static double wsum, wcount;
 357 static struct file *file;
 358
 359 static void report_progress(secaddr pos)
 360 {
 361   char etastr[32];
 362   struct timeval now;
 363   int eta;
 364   double percent, t, f, g, rate;
 365   char *unit;
 366
 367 #define ALPHA 0.02
 368 #define BETA (1 - ALPHA)
 369
 370   gettimeofday(&now, 0);
 371   t = (now.tv_sec - last_time.tv_sec) +
 372     (now.tv_usec - last_time.tv_usec)/1000000.0;
 373
 374   if (t) {
 375     g = wcount ? pow(BETA, t) : 0.0; f = (1 - g)/(1 - BETA);
 376     wsum = f*(pos - last_pos)/t + g*wsum;
 377     wcount = f + g*wcount;
 378     ndone += pos - last_pos;
 379     last_time = now; last_pos = pos;
 380   }
 381
 382   if (!wsum || !wcount)
 383     { rate = 0; strcpy(etastr, "???"); }
 384   else {
 385     rate = wsum/wcount;
 386     eta = (int)((nsectors - ndone)/rate);
 387     sprintf(etastr, "%d:%02d:%02d", eta/3600, (eta/60)%60, eta%60);
 388   }
 389
 390   rate *= SECTORSZ; unit = "";
 391   if (rate > 128) { rate /= 1024; unit = "k"; }
 392   if (rate > 128) { rate /= 1024; unit = "M"; }
 393   if (rate > 128) { rate /= 1024; unit = "G"; }
 394
 395   if (flags&F_ALLPROGRESS) percent = pos*100.0/limit;
 396   else percent = ndone*100.0/nsectors;
 397   print_progress
 398     ("copied %.1f%% (%"PRIuSEC" of %"PRIuSEC"; %.1f %sB/s, ETA %s)",
 399      percent, pos, limit,  rate, unit, etastr);
 400   if (file && id_kind(file->id) == VOB) {
 401     append_progress(" -- %s %d %.1f%%",
 402                     id_part(file->id) ? "title" : "menu",
 403                     id_title(file->id),
 404                     (pos - file->start)*100.0/
 405                       (file->end - file->start));
 406   }
 407
 408 #undef ALPHA
 409 #undef BETA
 410 }
 411
 412 static dvd_reader_t *dvd;
 413 static int dvdfd = -1, outfd = -1;
 414 static dvd_file_t *vob;
 415 static const char *mapfile; static FILE *mapfp;
 416 static const char *errfile; static FILE *errfp;
 417
 418 struct badblock { secaddr start, end; };
 419 DEFVEC(badblock_v, struct badblock);
 420 static badblock_v badblocks = VEC_INIT;
 421
 422 static int compare_badblock(const void *a, const void *b)
 423 {
 424   const struct badblock *ba = a, *bb = b;
 425
 426   if (ba->start < bb->start) return (-1);
 427   else if (ba->start > bb->start) return (+1);
 428
 429   if (ba->end < bb->end) return (-1);
 430   else if (ba->end > bb->end) return (+1);
 431
 432   return (0);
 433 }
 434
 435 static ssize_t read_sectors(secaddr pos, void *buf, secaddr want)
 436 {
 437   ssize_t n, done;
 438   size_t lo, mid, hi;
 439   int fakeerr = 0;
 440   struct badblock *bad, *best;
 441   unsigned char *p = buf;
 442
 443   if (badblocks.n) {
 444     best = 0; lo = 0; hi = badblocks.n;
 445 #ifdef DEBUG
 446     debug_clear_progress();
 447     printf(";; searching badblocks for %"PRIuSEC" .. %"PRIuSEC"\n",
 448            pos, pos + want);
 449 #endif
 450     while (lo < hi) {
 451       mid = lo + (hi - lo)/2; bad = &badblocks.v[mid];
 452 #ifdef DEBUG
 453       printf(";;   try %zu (%"PRIuSEC" .. %"PRIuSEC")... ",
 454              mid, bad->start, bad->end);
 455 #endif
 456       if (pos < bad->start) { D( printf("high\n"); ) best = bad; hi = mid; }
 457       else if (pos >= bad->end) { D( printf("low\n"); ) lo = mid + 1; }
 458       else { D( printf("match!\n"); ) errno = EIO; return (-1); }
 459     }
 460 #ifdef DEBUG
 461     if (best)
 462       printf(";;   next is %"PRIuSEC" .. %"PRIuSEC"\n",
 463              best->start, best->end);
 464 #endif
 465     if (best && pos + want > best->start)
 466       { want = best->start - pos; fakeerr = EIO; }
 467   }
 468   done = 0;
 469   while (want) {
 470     if (vob)
 471       { errno = 0; n = DVDReadBlocks(vob, pos - file->start, want, p); }
 472     else if (file) {
 473       if (lseek(dvdfd, (off_t)pos*SECTORSZ, SEEK_SET) < 0)
 474         bail_syserr(errno, "failed to seek to sector %"PRIuSEC"", pos);
 475       errno = 0; n = read(dvdfd, p, want*SECTORSZ);
 476       if (n >= 0) n /= SECTORSZ;
 477     } else {
 478       memset(p, 0, want*SECTORSZ);
 479       n = want;
 480     }
 481
 482     if (n > 0) { done += n; pos += n; p += n*SECTORSZ; want -= n; }
 483     else if (!n) break;
 484     else if (errno == EIO && errfile) {
 485       open_file_on_demand(errfile, &errfp, "bad-sector error log");
 486       fprintf(errfp, "%"PRIuSEC" %"PRIuSEC"\n", pos, pos + 1);
 487       check_write(errfp, "bad-sector error log");
 488       break;
 489     } else if (errno != EINTR) break;
 490   }
 491   if (fakeerr && !errno) errno = fakeerr;
 492   return (!done && errno ? -1 : done);
 493 }
 494
 495 static void report_bad_blocks_progress(secaddr lo, secaddr hi, int err)
 496 {
 497   report_progress(hi);
 498
 499   if (lo == hi) append_progress(": retrying bad sector");
 500   else
 501     append_progress(": %"PRIuSEC" bad %s",
 502                     hi - lo, hi == lo + 1 ? "sector" : "sectors");
 503   if (err && err != EIO) append_progress(" (%s)", strerror(err));
 504   fflush(stdout);
 505 }
 506
 507 static void recovered(secaddr bad_lo, secaddr bad_hi)
 508 {
 509   clear_progress();
 510   moan("skipping %"PRIuSEC" bad sectors (%"PRIuSEC" .. %"PRIuSEC")",
 511        bad_hi - bad_lo, bad_lo, bad_hi);
 512   if (mapfile) {
 513     open_file_on_demand(mapfile, &mapfp, "bad-sector region map");
 514     fprintf(mapfp, "%"PRIuSEC" %"PRIuSEC"", bad_lo, bad_hi);
 515     if (file && id_kind(file->id) != RAW)
 516       fprintf(mapfp, " # %s #%d %"PRIuSEC"..%"PRIuSEC" of %"PRIuSEC" (%.1f%%)",
 517               id_part(file->id) ? "title" : "menu",
 518               id_title(file->id),
 519               bad_lo - file->start, bad_hi - file->start,
 520               file->end - file->start,
 521               (bad_lo - file->start)*100.0/(file->end - file->start));
 522     fputc('\n', mapfp);
 523     check_write(mapfp, "bad-sector region map");
 524   }
 525   if (lseek(outfd, (off_t)(bad_hi - bad_lo)*SECTORSZ, SEEK_CUR) < 0)
 526     bail_syserr(errno, "failed to seek past bad sectors");
 527 }
 528
 529 struct recoverybuf {
 530   unsigned char *buf;
 531   secaddr sz, pos, start, end;
 532 };
 533
 534 static void rearrange_sectors(struct recoverybuf *r,
 535                               secaddr dest, secaddr src, secaddr len)
 536 {
 537   assert(dest + len <= r->sz);
 538   assert(src + len <= r->sz);
 539   memmove(r->buf + dest*SECTORSZ, r->buf + src*SECTORSZ, len*SECTORSZ);
 540 }
 541
 542 #ifdef DEBUG
 543 __attribute__((format(printf, 2, 3)))
 544 static void show_recovery_buffer_map(const struct recoverybuf *r,
 545                                      const char *what, ...)
 546 {
 547   va_list ap;
 548
 549   va_start(ap, what);
 550   debug_clear_progress();
 551   printf(";; recovery buffer (");
 552   vprintf(what, ap);
 553   printf("): "
 554          "(%"PRIuSEC") ..%"PRIuSEC".. "
 555          "[%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"] "
 556          "..%"PRIuSEC".. (%"PRIuSEC")\n",
 557          r->pos, r->start,
 558          r->pos + r->start, r->end - r->start, r->pos + r->end,
 559          r->sz - r->end, r->pos + r->sz);
 560   va_end(ap);
 561   assert(r->start <= r->end);
 562   assert(r->end <= r->sz);
 563 }
 564 #endif
 565
 566 static ssize_t recovery_read_sectors(struct recoverybuf *r,
 567                                      secaddr pos, secaddr off, secaddr want)
 568 {
 569   ssize_t n;
 570
 571   assert(off <= r->sz); assert(want <= r->sz - off);
 572   n = read_sectors(pos, r->buf + off*SECTORSZ, want);
 573   return (n);
 574 }
 575
 576 static ssize_t recovery_read(struct recoverybuf *r,
 577                              secaddr pos, secaddr want)
 578 {
 579   secaddr diff, pp, nn;
 580   ssize_t n;
 581
 582 #ifdef DEBUG
 583   debug_clear_progress();
 584   show_recovery_buffer_map(r, "begin(%"PRIuSEC", %"PRIuSEC")", pos, want);
 585 #endif
 586
 587   if (pos < r->pos) {
 588     diff = r->pos - pos;
 589     if (r->start + diff >= r->sz) {
 590       r->pos = pos; r->start = r->end = 0;
 591 #ifdef DEBUG
 592       show_recovery_buffer_map(r, "cleared; shift up by %"PRIuSEC"", diff);
 593 #endif
 594     } else {
 595       if (r->end + diff > r->sz) r->end = r->sz - diff;
 596       rearrange_sectors(r, r->start + diff, r->start, r->end - r->start);
 597       r->pos -= diff; r->start += diff; r->end += diff;
 598 #ifdef DEBUG
 599       show_recovery_buffer_map(r, "shifted up by %"PRIuSEC"", diff);
 600 #endif
 601     }
 602   } else if (pos > r->pos + r->end) {
 603       r->pos = pos; r->start = r->end = 0;
 604 #ifdef DEBUG
 605       show_recovery_buffer_map(r, "cleared; beyond previous region");
 606 #endif
 607   } else if (pos + want > r->pos + r->sz) {
 608     diff = (pos + want) - (r->pos + r->sz);
 609     if (r->end <= diff) {
 610       r->pos = pos; r->start = r->end = 0;
 611 #ifdef DEBUG
 612       show_recovery_buffer_map(r, "cleared; shift down by %"PRIuSEC"", diff);
 613 #endif
 614     } else {
 615       if (r->start < diff) r->start = diff;
 616       rearrange_sectors(r, r->start - diff, r->start, r->end - r->start);
 617       r->pos += diff; r->start -= diff; r->end -= diff;
 618 #ifdef DEBUG
 619       show_recovery_buffer_map(r, "shifted down by %"PRIuSEC"", diff);
 620 #endif
 621     }
 622   }
 623
 624   if (pos < r->pos + r->start) {
 625     pp = pos - r->pos; nn = r->start - pp;
 626 #ifdef DEBUG
 627     printf(";; read low (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")", pos, pp, nn);
 628     fflush(stdout);
 629 #endif
 630     n = recovery_read_sectors(r, pos, pp, nn);
 631 #ifdef DEBUG
 632     printf(" -> %zd\n", n);
 633 #endif
 634     if (n != nn) {
 635       if (n >= 0 && n > want) n = want;
 636       goto end;
 637     }
 638     r->start = pp;
 639 #ifdef DEBUG
 640     show_recovery_buffer_map(r, "joined new region");
 641 #endif
 642   }
 643
 644   if (pos + want > r->pos + r->end) {
 645     pp = r->end; nn = (pos + want) - (r->pos + r->end);
 646 #ifdef DEBUG
 647     printf(";; read high (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")",
 648            r->pos + pp, pp, nn);
 649     fflush(stdout);
 650 #endif
 651     n = recovery_read_sectors(r, r->pos + pp, pp, nn);
 652 #ifdef DEBUG
 653     printf(" -> %zd\n", n);
 654 #endif
 655     if (n > 0) {
 656       r->end += n;
 657 #ifdef DEBUG
 658       show_recovery_buffer_map(r, "joined new region");
 659 #endif
 660     }
 661   }
 662
 663   n = r->pos + r->end - pos;
 664   if (!n && want) n = -1;
 665   else if (n > want) n = want;
 666
 667 end:
 668 #ifdef DEBUG
 669   show_recovery_buffer_map(r, "done; return %zd", n);
 670 #endif
 671   return (n);
 672 }
 673
 674 static secaddr run_length_wanted(secaddr pos, secaddr badlen,
 675                                  secaddr sz, secaddr end)
 676 {
 677   secaddr want;
 678
 679   want = 3*badlen/2;
 680   if (!want) want = 1;
 681   if (want > end - pos) want = end - pos;
 682   if (want > sz) want = sz;
 683   return (want);
 684 }
 685
 686 static ssize_t find_good_sector(secaddr *pos_inout, secaddr end,
 687                                 unsigned char *buf, secaddr sz)
 688 {
 689   int i;
 690   secaddr pos = *pos_inout, bad_lo, bad_hi, good, step, want;
 691   struct recoverybuf r;
 692   ssize_t n;
 693
 694   r.buf = buf; r.sz = sz; r.pos = r.start = r.end = 0;
 695   report_bad_blocks_progress(pos, pos, errno);
 696
 697   want = sz; if (want > end - pos) want = end - pos;
 698   for (i = 0; i < 4; i++) {
 699     n = recovery_read(&r, pos, want);
 700 #ifdef DEBUG
 701     debug_clear_progress();
 702     printf(";; [retry] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 703            pos, pos + want, n);
 704 #endif
 705     if (n > 0) {
 706       clear_progress();
 707       moan("sector %"PRIuSEC" read ok after retry", pos);
 708       return (n);
 709     }
 710   }
 711
 712   bad_lo = pos; bad_hi = pos + 1;
 713   for (;;) {
 714     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 715 #ifdef DEBUG
 716     debug_clear_progress();
 717     printf(";; bounding bad-block region: "
 718            "%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"\n",
 719            bad_lo, bad_hi - bad_lo, bad_hi);
 720 #endif
 721     if (bad_hi >= end) {
 722       clear_progress();
 723       moan("giving up on this extent");
 724       recovered(bad_lo, end); *pos_inout = end; return (0);
 725     }
 726     step = 2*(bad_hi - bad_lo); if (step > end - bad_lo) step = end - bad_lo;
 727     pos = bad_lo + step - 1;
 728     want = run_length_wanted(pos, step, sz, end);
 729     n = recovery_read(&r, pos, want);
 730 #ifdef DEBUG
 731     printf(";; [bound] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 732            pos, pos + want, n);
 733 #endif
 734     if (n == want) break;
 735     if (n < 0) n = 0;
 736     bad_hi = pos + n + 1;
 737   }
 738
 739   good = pos;
 740   while (good > bad_hi) {
 741     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 742 #ifdef DEBUG
 743     debug_clear_progress();
 744     printf(";; limiting bad-block region: "
 745            "%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"\n",
 746            bad_lo, bad_hi - bad_lo, bad_hi, good - bad_hi, good);
 747 #endif
 748     pos = bad_hi + (good - bad_hi)/2;
 749     step = pos - bad_lo;
 750     want = run_length_wanted(pos, step, sz, end);
 751     n = recovery_read(&r, pos, want);
 752 #ifdef DEBUG
 753     printf(";; [limit] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 754            pos, pos + want, n);
 755 #endif
 756     if (n < 0) n = 0;
 757     if (n == want) good = pos;
 758     else bad_hi = pos + n + 1;
 759   }
 760   recovered(bad_lo, bad_hi); *pos_inout = good;
 761   if (good < r.pos + r.start || r.pos + r.end <= good)
 762     n = 0;
 763   else {
 764     n = r.pos + r.end - good;
 765     rearrange_sectors(&r, 0, good - r.pos, n);
 766   }
 767 #ifdef DEBUG
 768   show_recovery_buffer_map(&r, "returning %zd good sectors at %"PRIuSEC"",
 769                            n, good);
 770 #endif
 771   return (n);
 772 }
 773
 774 static void emit(secaddr start, secaddr end)
 775 {
 776 #define BUFSECTORS 512
 777
 778   int least;
 779   unsigned char buf[BUFSECTORS*SECTORSZ];
 780   secaddr pos;
 781   size_t want;
 782   ssize_t n;
 783   static int first_time = 1;
 784 #ifdef DEBUG
 785   struct file *f;
 786   char fn[MAXFNSZ];
 787   int act = -1;
 788   int i;
 789 #endif
 790
 791   least = least_live();
 792
 793 #ifdef DEBUG
 794   printf(";; %8"PRIuSEC" .. %"PRIuSEC"\n", start, end);
 795
 796   for (i = 0; i < filetab.n; i++) {
 797     if (!livep(i)) continue;
 798     if (act == -1) act = i;
 799     f = &filetab.v[i]; store_filename(fn, f->id);
 800     printf(";;\t\t%8"PRIuSEC" .. %-8"PRIuSEC" %s\n",
 801            start - f->start, end - f->start, fn);
 802   }
 803   if (act == -1) printf(";;\t\t#<no live source>\n");
 804   assert(act == least);
 805 #endif
 806
 807   if (least == -1)
 808     { file = 0; vob = 0; }
 809   else {
 810     file = &filetab.v[least];
 811     switch (id_kind(file->id)) {
 812       case RAW:
 813         vob = 0;
 814         break;
 815       case VOB:
 816         if (first_time) { clear_progress(); first_time = 0; }
 817         vob = DVDOpenFile(dvd, id_title(file->id),
 818                           id_part(file->id)
 819                             ? DVD_READ_TITLE_VOBS
 820                             : DVD_READ_MENU_VOBS);
 821         if (!vob)
 822           bail("failed to open %s %u",
 823                id_part(file->id) ? "title" : "menu",
 824                id_title(file->id));
 825         break;
 826       default:
 827         abort();
 828     }
 829   }
 830
 831   pos = start;
 832   while (pos < end) {
 833     want = end - pos; if (want > BUFSECTORS) want = BUFSECTORS;
 834     n = read_sectors(pos, buf, want);
 835
 836     if (n <= 0) n = find_good_sector(&pos, end, buf, BUFSECTORS);
 837     if (n > 0) { carefully_write(outfd, buf, n*SECTORSZ); pos += n; }
 838     report_progress(pos); fflush(stdout);
 839   }
 840
 841   if (vob) { DVDCloseFile(vob); vob = 0; }
 842
 843 #undef BUFSECTORS
 844 }
 845
 846 #ifdef notdef
 847 static void logfn(void *p, dvd_logger_level_t lev,
 848                   const char *fmt, va_list ap)
 849 {
 850   switch (lev) {
 851     case DVD_LOGGER_LEVEL_ERROR:
 852       fprintf("%s (libdvdread error): ", prog);
 853       break;
 854     case DVD_LOGGER_LEVEL_WARN:
 855       fprintf("%s (libdvdread warning): ", prog);
 856       break;
 857     default:
 858       return;
 859   }
 860   vfprintf(stderr, fmt, ap);
 861   fputc('\n', stderr);
 862 }
 863 static const dvd_logger_cb logger = { logfn };
 864 #endif
 865
 866 struct buf {
 867   char *p;
 868   size_t n, sz;
 869 };
 870 #define BUF_INIT { 0, 0, 0 }
 871 #define BUF_REWIND(b) do { (b)->n = 0; } while (0)
 872 #define BUF_FREE(b) do {                                                \
 873   buf *_b = (b);                                                        \
 874   free(_b->p); _b->p = 0; _b->n = _b->sz = 0;                           \
 875 } while (0)
 876 #define BUF_PUTC(b, ch) do {                                            \
 877   struct buf *_b = (b);                                                 \
 878   if (_b->n >= _b->sz) {                                                \
 879     _b->sz = _b->sz ? 2*_b->sz : 32;                                    \
 880     _b->p = realloc(_b->p, _b->sz);                                     \
 881     if (!_b->p) bail("out of memory allocating %zu bytes", _b->sz);     \
 882   }                                                                     \
 883   _b->p[_b->n] = (ch);                                                  \
 884 } while (0)
 885
 886 static int read_line(FILE *fp, struct buf *b)
 887 {
 888   int ch;
 889
 890   ch = getc(fp);
 891   if (ch == EOF)
 892     return (-1);
 893   else if (ch != '\n') do {
 894     BUF_PUTC(b, ch); b->n++;
 895     ch = getc(fp);
 896   } while (ch != EOF && ch != '\n');
 897   BUF_PUTC(b, 0);
 898   return (0);
 899 }
 900
 901 #define PRF_HYPHEN 1u
 902 static int parse_range(const char *p, unsigned f,
 903                        secaddr *start_out, secaddr *end_out)
 904 {
 905   char *q;
 906   int err, rc;
 907   unsigned long start, end;
 908
 909   err = errno;
 910
 911   if (ISDIGIT(*p)) {
 912     start = strtoul(p, &q, 0);
 913     if (errno || start >= SECLIMIT) { rc = -1; goto end; }
 914     *start_out = start; p = q;
 915   } else if (!(f&PRF_HYPHEN))
 916     { rc = -1; goto end; }
 917   else
 918     start = 0;
 919
 920   if (f&PRF_HYPHEN) {
 921     if (*p != '-')  { rc = -1; goto end; }
 922     p++;
 923   } else {
 924     if (!ISSPACE(*p)) { rc = -1; goto end; }
 925     do p++; while (ISSPACE(*p));
 926   }
 927
 928   if (ISDIGIT(*p)) {
 929     end = strtoul(p, &q, 0);
 930     if (errno || end > SECLIMIT || end < start) { rc = -1; goto end; }
 931     *end_out = end; p = q;
 932   } else if (!(f&PRF_HYPHEN))
 933     { rc = -1; goto end; }
 934
 935   if (!(f&PRF_HYPHEN)) while (ISSPACE(*p)) p++;
 936   if (*p && ((f&PRF_HYPHEN) || *p != '#')) { rc = -1; goto end; }
 937
 938   rc = 0;
 939 end:
 940   errno = err;
 941   return (rc);
 942 }
 943
 944 int main(int argc, char *argv[])
 945 {
 946   unsigned f = 0;
 947   char *p;
 948   uint64_t volsz;
 949   secaddr pos;
 950   off_t off;
 951   secaddr start, end, last;
 952   const struct event *ev;
 953   const char *device, *outfile;
 954   struct badblock *bad;
 955   int opt, blksz;
 956   unsigned n;
 957   size_t i;
 958   FILE *fp;
 959   struct buf buf = BUF_INIT;
 960   struct stat st;
 961 #ifdef DEBUG
 962   const struct file *file;
 963   char fn[MAXFNSZ];
 964 #endif
 965
 966 #define f_bogus 1u
 967 #define f_continue 2u
 968 #define f_fixup 4u
 969 #define f_write 256u
 970
 971   p = strrchr(argv[0], '/'); prog = p ? p + 1 : argv[0];
 972   for (;;) {
 973     opt = getopt(argc, argv, "hE:FR:X:b:cr:"); if (opt < 0) break;
 974     switch (opt) {
 975       case 'h': usage(stderr); exit(0);
 976       case 'E': errfile = optarg; break;
 977       case 'F': f |= f_fixup; break;
 978       case 'R':
 979         fp = fopen(optarg, "r");
 980         if (!fp)
 981           bail_syserr(errno, "failed to open ranges file `%s'", optarg);
 982         i = 0; last = -1;
 983         for (;;) {
 984           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
 985           p = buf.p; i++;
 986           while (ISSPACE(*p)) p++;
 987           if (!*p || *p == '#') continue;
 988           if (parse_range(p, 0, &start, &end) ||
 989               (last <= SECLIMIT && start < last))
 990             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
 991           if (start < end) {
 992             if (start == last)
 993               eventq.v[eventq.n - 1].pos = end;
 994             else {
 995               put_event(EV_WRITE, 0, start);
 996               put_event(EV_STOP, 0, end);
 997             }
 998             last = end;
 999           }
1000         }
1001         if (ferror(fp))
1002           bail_syserr(errno, "failed to read ranges file `%s'", optarg);
1003         break;
1004       case 'X':
1005         fp = fopen(optarg, "r");
1006         if (!fp)
1007           bail_syserr(errno, "failed to open bad-blocks file `%s'", optarg);
1008         i = 0; last = -1;
1009         for (;;) {
1010           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
1011           p = buf.p; i++;
1012           while (ISSPACE(*p)) p++;
1013           if (!*p || *p == '#') continue;
1014           if (parse_range(p, 0, &start, &end) ||
1015               (last <= SECLIMIT && start < last))
1016             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
1017           if (start < end)
1018             { VEC_PUSH(bad, &badblocks); bad->start = start; bad->end = end; }
1019         }
1020         if (ferror(fp))
1021           bail_syserr(errno, "failed to read bad-blocks file `%s'", optarg);
1022         break;
1023       case 'b':
1024         if (mapfile) bail("can't have multiple map files");
1025         mapfile = optarg;
1026         break;
1027       case 'c': f |= f_continue; break;
1028       case 'r':
1029         start = 0; end = -1;
1030         if (parse_range(optarg, PRF_HYPHEN, &start, &end))
1031           bail("bad range `%s'", optarg);
1032         if (start < end) {
1033           put_event(EV_WRITE, 0, start);
1034           if (end <= SECLIMIT) put_event(EV_STOP, 0, end);
1035         }
1036         break;
1037       default: f |= f_bogus; break;
1038     }
1039   }
1040   if (argc - optind != 2) f |= f_bogus;
1041   if (f&f_bogus) { usage(stderr); exit(2); }
1042
1043   device = argv[optind]; outfile = argv[optind + 1];
1044
1045   if (badblocks.n) {
1046     qsort(badblocks.v, badblocks.n, sizeof(struct badblock),
1047           compare_badblock);
1048 #ifdef DEBUG
1049     printf(";; fake bad blocks:\n");
1050     for (i = 0; i < badblocks.n; i++)
1051       printf(";;\t%8"PRIuSEC" .. %"PRIuSEC"\n",
1052              badblocks.v[i].start, badblocks.v[i].end);
1053 #endif
1054   }
1055
1056   dvdfd = open(device, O_RDONLY);
1057   if (dvdfd < 0)
1058     bail_syserr(errno, "failed to open device `%s'", device);
1059   if (fstat(dvdfd, &st))
1060     bail_syserr(errno, "failed to stat device `%s'", device);
1061   if (S_ISREG(st.st_mode)) {
1062     blksz = SECTORSZ;
1063     volsz = st.st_size;
1064   } else if (S_ISBLK(st.st_mode)) {
1065     if (ioctl(dvdfd, BLKSSZGET, &blksz))
1066       bail_syserr(errno, "failed to get block size for `%s'", device);
1067     if (ioctl(dvdfd, BLKGETSIZE64, &volsz))
1068       bail_syserr(errno, "failed to get volume size for `%s'", device);
1069   } else
1070     bail("can't use `%s' as source: expected file or block device", device);
1071
1072   if (blksz != SECTORSZ)
1073     bail("device `%s' block size %d /= %d", device, blksz, SECTORSZ);
1074   if (volsz%SECTORSZ)
1075     bail("device `%s' volume size %"PRIu64" not a multiple of %d",
1076          device, volsz, SECTORSZ);
1077
1078   if (outfile) {
1079     outfd = open(outfile, O_WRONLY | O_CREAT, 0666);
1080     if (outfd < 0)
1081       bail_syserr(errno, "failed to create output file `%s'", outfile);
1082   }
1083
1084   if (f&f_continue) {
1085     off = lseek(outfd, 0, SEEK_END);
1086     if (off < 0)
1087       bail_syserr(errno, "failed to seek to end of output file `%s'",
1088                   outfile);
1089     put_event(EV_WRITE, 0, off/SECTORSZ);
1090   } else if (!eventq.n && !(f&f_fixup))
1091     put_event(EV_WRITE, 0, 0);
1092
1093 #ifdef notdef
1094   dvd = DVDOpen2(0, &logger, device);
1095 #else
1096   dvd = DVDOpen(device);
1097 #endif
1098   if (!dvd) bail("failed to open DVD on `%s'", device);
1099
1100   /* It's fast enough just to check everything. */
1101   put_menu(dvd, 0);
1102   for (i = 1; i < 100; i++) {
1103     put_menu(dvd, i);
1104     put_title(dvd, i);
1105   }
1106   put_file(mkident(RAW, 0, 0), 0, volsz/SECTORSZ);
1107   assert(filetab.n <= MAXFILES);
1108
1109   for (i = 0, limit = 0; i < filetab.n; i++)
1110     if (filetab.v[i].end > limit) limit = filetab.v[i].end;
1111
1112   if (end > limit) end = limit;
1113
1114 #ifdef DEBUG
1115   printf("\n;; files:\n");
1116   for (i = 0; i < filetab.n; i++) {
1117     file = &filetab.v[i];
1118     store_filename(fn, file->id);
1119     printf(";;\t%8"PRIuSEC" %s\n", file->start, fn);
1120   }
1121 #endif
1122
1123   qsort(eventq.v, eventq.n, sizeof(struct event), compare_event);
1124
1125   f &= ~f_write; start = 0; n = 0;
1126   for (i = 0; i < eventq.n; i++) {
1127     ev = &eventq.v[i];
1128     switch (ev->ev) {
1129       case EV_WRITE:
1130         if (f&f_write)
1131           bail("overlapping ranges: range from %"PRIuSEC" still open at %"PRIuSEC"",
1132                start, ev->pos);
1133         n++; f |= f_write; start = ev->pos;
1134         break;
1135       case EV_STOP:
1136         f &= ~f_write;
1137         break;
1138     }
1139   }
1140
1141   f &= ~f_write; start = 0;
1142   for (i = 0; i < eventq.n; i++) {
1143     ev = &eventq.v[i];
1144     switch (ev->ev) {
1145       case EV_WRITE: start = ev->pos; f |= f_write; break;
1146       case EV_STOP: nsectors += ev->pos - start; f &= ~f_write; break;
1147     }
1148     if (ev->pos >= limit) break;
1149     if (f&f_fixup) start = ev->pos;
1150   }
1151   eventq.n = i;
1152   if (f&f_fixup) {
1153     put_event(EV_WRITE, 0, start);
1154     n++; f |= f_write;
1155   }
1156   if (f&f_write) {
1157     nsectors += limit - start;
1158     put_event(EV_STOP, 0, limit);
1159   }
1160   if (n == 1 && (f&f_write)) flags |= F_ALLPROGRESS;
1161   f &= ~f_write;
1162
1163 #ifdef DEBUG
1164   printf("\n;; event sweep:\n");
1165 #endif
1166   for (pos = 0, i = 0; i < eventq.n; i++) {
1167     ev = &eventq.v[i];
1168     if (ev->pos > pos) {
1169       if (f&f_write) emit(pos, ev->pos);
1170       pos = ev->pos;
1171 #ifdef DEBUG
1172       debug_clear_progress();
1173       printf(";;\n");
1174 #endif
1175     }
1176     switch (ev->ev) {
1177       case EV_BEGIN:
1178         set_live(ev->file);
1179 #ifdef DEBUG
1180         store_filename(fn, filetab.v[ev->file].id);
1181         debug_clear_progress();
1182         printf(";; %8"PRIuSEC": begin `%s'\n", pos, fn);
1183 #endif
1184         break;
1185       case EV_WRITE:
1186         gettimeofday(&last_time, 0); last_pos = pos;
1187         if (lseek(outfd, (off_t)ev->pos*SECTORSZ, SEEK_SET) < 0)
1188           bail_syserr(errno,
1189                       "failed to seek to resume position "
1190                       "(sector %"PRIuSEC") in output file `%s'",
1191                       ev->pos, outfile);
1192 #ifdef DEBUG
1193         debug_clear_progress();
1194         printf(";; %8"PRIuSEC": begin write\n", pos);
1195 #endif
1196         f |= f_write;
1197         break;
1198       case EV_STOP:
1199         f &= ~f_write;
1200 #ifdef DEBUG
1201         debug_clear_progress();
1202         printf(";; %8"PRIuSEC": end write\n", pos);
1203 #endif
1204         break;
1205       case EV_END:
1206         clear_live(ev->file);
1207 #ifdef DEBUG
1208         store_filename(fn, filetab.v[ev->file].id);
1209         debug_clear_progress();
1210         printf(";; %8"PRIuSEC": end `%s'\n", pos, fn);
1211 #endif
1212         break;
1213       default: abort();
1214     }
1215   }
1216
1217   if (progresslen) putchar('\n');
1218
1219   if (ftruncate(outfd, (off_t)limit*SECTORSZ) < 0)
1220     bail_syserr(errno, "failed to set output file `%s' length", outfile);
1221
1222   if (dvd) DVDClose(dvd);
1223   if (dvdfd >= 0) close(dvdfd);
1224   if (outfd >= 0) close(outfd);
1225   carefully_fclose(mapfp, "bad-sector region map");
1226   carefully_fclose(errfp, "bad-sector error log");
1227
1228 #undef f_bogus
1229 #undef f_continue
1230 #undef f_fixup
1231 #undef f_write
1232
1233   return (status);
1234 }