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 #define DEFVEC(vtype, etype)                                            \
 108         typedef struct { etype *v; size_t n, sz; } vtype
 109 #define VEC_INIT { 0, 0, 0 }
 110 #define VEC_FREE(vv) do {                                               \
 111   free((vv)->v); (vv)->v 0; (vv)->n = (vv)->sz = 0;                     \
 112 } while (0)
 113 #define VEC_PUSH(p, vv) do {                                            \
 114   size_t _want;                                                         \
 115   if ((vv)->n >= (vv)->sz) {                                            \
 116     (vv)->sz = (vv)->sz ? 2*(vv)->sz : 32;                              \
 117     _want = (vv)->sz*sizeof(*(vv)->v);                                  \
 118     (vv)->v = realloc((vv)->v, _want);                                  \
 119     if (!(vv)->v) bail("out of memory allocating %zu bytes", _want);    \
 120   }                                                                     \
 121   (p) = &(vv)->v[(vv)->n++];                                            \
 122 } while (0)
 123
 124 enum { RAW, IFO, VOB, BUP };
 125 typedef uint_least32_t ident;
 126
 127 static inline ident mkident(unsigned kind, unsigned title, unsigned part)
 128   { return (((ident)kind << 0) | ((ident)title << 8) | ((ident)part << 16)); }
 129 static inline unsigned id_kind(ident id) { return ((id >> 0)&0x0ff); }
 130 static inline unsigned id_title(ident id) { return ((id >> 8)&0x0ff); }
 131 static inline unsigned id_part(ident id) { return ((id >> 16)&0x0ff); }
 132
 133 #define MAXFNSZ (1 + 8 + 1 + 12 + 1)
 134
 135 static void store_filename(char *buf, ident id)
 136 {
 137   switch (id_kind(id)) {
 138     case RAW:
 139       sprintf(buf, "#<raw device>");
 140       break;
 141     case IFO:
 142       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.IFO");
 143       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.IFO", id_title(id));
 144       break;
 145     case BUP:
 146       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.BUP");
 147       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.BUP", id_title(id));
 148       break;
 149     case VOB:
 150       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.VOB");
 151       else
 152         sprintf(buf, "/VIDEO_TS/VTS_%02u_%u.VOB", id_title(id), id_part(id));
 153       break;
 154     default:
 155       abort();
 156   }
 157 }
 158
 159 typedef uint_least32_t secaddr;
 160 #define PRIuSEC PRIuLEAST32
 161 #define SECLIMIT 0x00400000
 162
 163 #define MAXFILES (1 + 2*99 + 1)
 164 struct file {
 165   ident id;
 166   secaddr start, end;
 167 };
 168 DEFVEC(file_v, struct file);
 169 static file_v filetab = VEC_INIT;
 170
 171 enum { EV_STOP, EV_BEGIN, EV_END, EV_WRITE };
 172 struct event {
 173   unsigned char ev, file;
 174   secaddr pos;
 175 };
 176 DEFVEC(event_v, struct event);
 177 static event_v eventq = VEC_INIT;
 178
 179 static int compare_event(const void *a, const void *b)
 180 {
 181   const struct event *eva = a, *evb = b;
 182
 183   if (eva->pos < evb->pos) return (-1);
 184   else if (eva->pos > evb->pos) return (+1);
 185
 186   if (eva->ev < evb->ev) return (-1);
 187   else if (eva->ev > evb->ev) return (+1);
 188
 189   if (eva->file < evb->file) return (-1);
 190   else if (eva->file > evb->file) return (+1);
 191
 192   return (0);
 193 }
 194
 195 typedef uint_least32_t bits;
 196 static bits live[(MAXFILES + 31)/32];
 197
 198 static inline int livep(unsigned i)
 199   { return (live[i/32]&((bits)1 << (i%32))); }
 200 static inline void set_live(unsigned i)
 201   { live[i/32] |= (bits)1 << (i%32); }
 202 static inline void clear_live(unsigned i)
 203   { live[i/32] &= ~((bits)1 << (i%32)); }
 204 static inline int least_live(void)
 205 {
 206   unsigned i, n = (filetab.n + 32)/32;
 207   bits b;
 208
 209   for (i = 0; i < n; i++) { b = live[i]; if (b) goto found; }
 210   return (-1);
 211 found:
 212   i *= 32;
 213   if (!(b&0x0000ffff)) { b >>= 16; i += 16; }
 214   if (!(b&0x000000ff)) { b >>=  8; i +=  8; }
 215   if (!(b&0x0000000f)) { b >>=  4; i +=  4; }
 216   if (!(b&0x00000003)) { b >>=  2; i +=  2; }
 217   if (!(b&0x00000001)) { b >>=  1; i +=  1; }
 218   assert(b&1);
 219   return (i);
 220 }
 221
 222 static void put_event(unsigned evtype, unsigned file, secaddr pos)
 223 {
 224   struct event *ev;
 225
 226   VEC_PUSH(ev, &eventq);
 227   ev->ev = evtype; ev->file = file; ev->pos = pos;
 228 }
 229
 230 static void put_file(ident id, secaddr start, secaddr end)
 231 {
 232   struct file *f;
 233   size_t i;
 234
 235   VEC_PUSH(f, &filetab); i = f - filetab.v;
 236   f->id = id; f->start = start; f->end = end;
 237   put_event(EV_BEGIN, i, start);
 238   put_event(EV_END, i, end);
 239 }
 240
 241 static void put_menu(dvd_reader_t *dvd, unsigned title)
 242 {
 243   ident id = mkident(VOB, title, 0);
 244   char fn[MAXFNSZ];
 245   secaddr start, len;
 246
 247   store_filename(fn, id);
 248   start = UDFFindFile(dvd, fn, &len); if (!start) return;
 249 #ifdef DEBUG
 250       printf(";; %8"PRIuSEC" .. %-8"PRIuSEC": %s\n",
 251              start, start + SECTORS(len), fn);
 252 #endif
 253   put_file(id, start, start + SECTORS(len));
 254 }
 255
 256 static void put_title(dvd_reader_t *dvd, unsigned title)
 257 {
 258   char fn[MAXFNSZ];
 259   secaddr start[9], len[9];
 260   unsigned i, npart;
 261
 262   for (i = 0; i < 9; i++) {
 263     store_filename(fn, mkident(VOB, title, i + 1));
 264     start[i] = UDFFindFile(dvd, fn, &len[i]); if (!start[i]) break;
 265   }
 266   npart = i; if (!npart) return;
 267
 268 #ifdef DEBUG
 269   for (i = 0; i < npart; i++) {
 270     store_filename(fn, mkident(VOB, title, i + 1));
 271     printf(";; %8"PRIuSEC" .. %-8"PRIuSEC": %s\n",
 272            start[i], start[i] + SECTORS(len[i]), fn);
 273   }
 274 #endif
 275
 276   if (npart > 1)
 277     for (i = 0; i < npart - 1; i++) {
 278       if (len[i]%SECTORSZ)
 279         bail("title %u part %u length = %"PRIuSEC" not a multiple of %d",
 280              title, i, len[i], SECTORSZ);
 281       if (start[i] + len[i]/SECTORSZ != start[i + 1])
 282         bail
 283           ("title %u part %u end = %"PRIuSEC" /= part %u start = %"PRIuSEC"",
 284            title, i, start[i] + len[i]/SECTORSZ, i + 1, start[i + 1]);
 285     }
 286
 287   put_file(mkident(VOB, title, 1),
 288            start[0], start[npart - 1] + SECTORS(len[npart - 1]));
 289 }
 290
 291 static int progresslen = 0;
 292
 293 static void clear_progress_internal(void)
 294 {
 295   while (progresslen) { fputs("\b \b", stdout); progresslen--; }
 296   putchar('\r');
 297 }
 298 static void clear_progress(void)
 299   { clear_progress_internal(); fflush(stdout); }
 300 static void vappend_progress(const char *fmt, va_list ap)
 301   { progresslen += vprintf(fmt, ap); }
 302 __attribute__((format(printf, 1, 2)))
 303 static void append_progress(const char *fmt, ...)
 304 {
 305   va_list ap;
 306
 307   va_start(ap, fmt);
 308   vappend_progress(fmt, ap);
 309   va_end(ap);
 310 }
 311 __attribute__((format(printf, 1, 2)))
 312 static void print_progress(const char *fmt, ...)
 313 {
 314   va_list ap;
 315
 316   va_start(ap, fmt);
 317   clear_progress_internal();
 318   vappend_progress(fmt, ap);
 319   va_end(ap);
 320 }
 321
 322 unsigned flags;
 323 #  define F_ALLPROGRESS 1u
 324 static secaddr last_pos, limit, nsectors, ndone;
 325 static struct timeval last_time;
 326 static double wsum, wcount;
 327 static struct file *file;
 328
 329 static void report_progress(secaddr pos)
 330 {
 331   char etastr[32];
 332   struct timeval now;
 333   int eta;
 334   double percent, t, f, g, rate;
 335   char *unit;
 336
 337 #define ALPHA 0.02
 338 #define BETA (1 - ALPHA)
 339
 340   gettimeofday(&now, 0);
 341   t = (now.tv_sec - last_time.tv_sec) +
 342     (now.tv_usec - last_time.tv_usec)/1000000.0;
 343
 344   if (t) {
 345     g = wcount ? pow(BETA, t) : 0.0; f = (1 - g)/(1 - BETA);
 346     wsum = f*(pos - last_pos)/t + g*wsum;
 347     wcount = f + g*wcount;
 348     ndone += pos - last_pos;
 349     last_time = now; last_pos = pos;
 350   }
 351
 352   if (!wsum || !wcount)
 353     { rate = 0; strcpy(etastr, "???"); }
 354   else {
 355     rate = wsum/wcount;
 356     eta = (int)((nsectors - ndone)/rate);
 357     sprintf(etastr, "%d:%02d:%02d", eta/3600, (eta/60)%60, eta%60);
 358   }
 359
 360   rate *= SECTORSZ; unit = "";
 361   if (rate > 128) { rate /= 1024; unit = "k"; }
 362   if (rate > 128) { rate /= 1024; unit = "M"; }
 363   if (rate > 128) { rate /= 1024; unit = "G"; }
 364
 365   if (flags&F_ALLPROGRESS) percent = pos*100.0/limit;
 366   else percent = ndone*100.0/nsectors;
 367   print_progress
 368     ("copied %.1f%% (%"PRIuSEC" of %"PRIuSEC"; %.1f %sB/s, ETA %s)",
 369      percent, pos, limit,  rate, unit, etastr);
 370   if (file && id_kind(file->id) == VOB) {
 371     append_progress(" -- %s %d %3.1f%%",
 372                     id_part(file->id) ? "title" : "menu",
 373                     id_title(file->id),
 374                     (pos - file->start)*100.0/
 375                       (file->end - file->start));
 376   }
 377
 378 #undef ALPHA
 379 #undef BETA
 380 }
 381
 382 static dvd_reader_t *dvd;
 383 static int dvdfd = -1, outfd = -1;
 384 static dvd_file_t *vob;
 385 static const char *mapfile; static FILE *mapfp;
 386
 387 struct badblock { secaddr start, end; };
 388 DEFVEC(badblock_v, struct badblock);
 389 static badblock_v badblocks = VEC_INIT;
 390
 391 static int compare_badblock(const void *a, const void *b)
 392 {
 393   const struct badblock *ba = a, *bb = b;
 394
 395   if (ba->start < bb->start) return (-1);
 396   else if (ba->start > bb->start) return (+1);
 397
 398   if (ba->end < bb->end) return (-1);
 399   else if (ba->end > bb->end) return (+1);
 400
 401   return (0);
 402 }
 403
 404 static ssize_t read_sectors(secaddr pos, void *buf, secaddr want)
 405 {
 406   ssize_t n, done;
 407   size_t lo, mid, hi;
 408   int fakeerr = 0;
 409   struct badblock *bad, *best;
 410   unsigned char *p = buf;
 411
 412   if (badblocks.n) {
 413     best = 0; lo = 0; hi = badblocks.n;
 414 #ifdef DEBUG
 415     debug_clear_progress();
 416     printf(";; searching badblocks for %"PRIuSEC" .. %"PRIuSEC"\n",
 417            pos, pos + want);
 418 #endif
 419     while (lo < hi) {
 420       mid = lo + (hi - lo)/2; bad = &badblocks.v[mid];
 421 #ifdef DEBUG
 422       printf(";;   try %zu (%"PRIuSEC" .. %"PRIuSEC")... ",
 423              mid, bad->start, bad->end);
 424 #endif
 425       if (pos < bad->start) { D( printf("high\n"); ) best = bad; hi = mid; }
 426       else if (pos >= bad->end) { D( printf("low\n"); ) lo = mid + 1; }
 427       else { D( printf("match!\n"); ) errno = EIO; return (-1); }
 428     }
 429 #ifdef DEBUG
 430     if (best)
 431       printf(";;   next is %"PRIuSEC" .. %"PRIuSEC"\n",
 432              best->start, best->end);
 433 #endif
 434     if (best && pos + want > best->start)
 435       { want = best->start - pos; fakeerr = EIO; }
 436   }
 437   done = 0;
 438   while (want) {
 439     if (vob)
 440       { errno = 0; n = DVDReadBlocks(vob, pos - file->start, want, p); }
 441     else if (file) {
 442       if (lseek(dvdfd, (off_t)pos*SECTORSZ, SEEK_SET) < 0)
 443         bail_syserr(errno, "failed to seek to sector %"PRIuSEC"", pos);
 444       errno = 0; n = read(dvdfd, p, want*SECTORSZ);
 445       if (n >= 0) n /= SECTORSZ;
 446     } else {
 447       memset(p, 0, want*SECTORSZ);
 448       n = want;
 449     }
 450
 451     if (n > 0) { done += n; pos += n; p += n*SECTORSZ; want -= n; }
 452     else if (!n || errno != EINTR) break;
 453   }
 454   if (fakeerr && !errno) errno = fakeerr;
 455   return (!done && errno ? -1 : done);
 456 }
 457
 458 static void report_bad_blocks_progress(secaddr lo, secaddr hi, int err)
 459 {
 460   report_progress(hi);
 461
 462   if (lo == hi) append_progress(": retrying bad sector");
 463   else
 464     append_progress(": %"PRIuSEC" bad %s",
 465                     hi - lo, hi == lo + 1 ? "sector" : "sectors");
 466   if (err && err != EIO) append_progress(" (%s)", strerror(err));
 467   fflush(stdout);
 468 }
 469
 470 static void recovered(secaddr bad_lo, secaddr bad_hi)
 471 {
 472   clear_progress();
 473   moan("skipping %"PRIuSEC" bad sectors (%"PRIuSEC" .. %"PRIuSEC")",
 474        bad_hi - bad_lo, bad_lo, bad_hi);
 475   if (mapfile) {
 476     if (!mapfp) {
 477       mapfp = fopen(mapfile, "w");
 478       if (!mapfp)
 479         bail_syserr(errno, "failed to open bad-sector map file `%s'",
 480                     optarg);
 481       fprintf(mapfp, "## bad sector map\n\n");
 482     }
 483     fprintf(mapfp, "%"PRIuSEC" %"PRIuSEC"\n", bad_lo, bad_hi);
 484     fflush(mapfp);
 485     if (ferror(mapfp))
 486       bail_syserr(errno, "error writing bad-sector map file");
 487   }
 488   if (lseek(outfd, (off_t)(bad_hi - bad_lo)*SECTORSZ, SEEK_CUR) < 0)
 489     bail_syserr(errno, "failed to seek past bad sectors");
 490   status = 1;
 491 }
 492
 493 struct recoverybuf {
 494   unsigned char *buf;
 495   secaddr sz, pos, start, end;
 496 };
 497
 498 static void rearrange_sectors(struct recoverybuf *r,
 499                               secaddr dest, secaddr src, secaddr len)
 500 {
 501   assert(dest + len <= r->sz);
 502   assert(src + len <= r->sz);
 503   memmove(r->buf + dest*SECTORSZ, r->buf + src*SECTORSZ, len*SECTORSZ);
 504 }
 505
 506 #ifdef DEBUG
 507 __attribute__((format(printf, 2, 3)))
 508 static void show_recovery_buffer_map(const struct recoverybuf *r,
 509                                      const char *what, ...)
 510 {
 511   va_list ap;
 512
 513   va_start(ap, what);
 514   clear_progress();
 515   printf(";; recovery buffer (");
 516   vprintf(what, ap);
 517   printf("): "
 518          "(%"PRIuSEC") ..%"PRIuSEC".. "
 519          "[%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"] "
 520          "..%"PRIuSEC".. (%"PRIuSEC")\n",
 521          r->pos, r->start,
 522          r->pos + r->start, r->end - r->start, r->pos + r->end,
 523          r->sz - r->end, r->pos + r->sz);
 524   va_end(ap);
 525   assert(r->start <= r->end);
 526   assert(r->end <= r->sz);
 527 }
 528 #endif
 529
 530 static ssize_t recovery_read_sectors(struct recoverybuf *r,
 531                                      secaddr pos, secaddr off, secaddr want)
 532 {
 533   ssize_t n;
 534
 535   assert(off <= r->sz); assert(want <= r->sz - off);
 536   n = read_sectors(pos, r->buf + off*SECTORSZ, want);
 537   return (n);
 538 }
 539
 540 static ssize_t recovery_read(struct recoverybuf *r,
 541                              secaddr pos, secaddr want)
 542 {
 543   secaddr diff, pp, nn;
 544   ssize_t n;
 545
 546 #ifdef DEBUG
 547   clear_progress();
 548   show_recovery_buffer_map(r, "begin(%"PRIuSEC", %"PRIuSEC")", pos, want);
 549 #endif
 550
 551   if (pos < r->pos) {
 552     diff = r->pos - pos;
 553     if (r->start + diff >= r->sz) {
 554       r->pos = pos; r->start = r->end = 0;
 555 #ifdef DEBUG
 556       show_recovery_buffer_map(r, "cleared; shift up by %"PRIuSEC"", diff);
 557 #endif
 558     } else {
 559       if (r->end + diff > r->sz) r->end = r->sz - diff;
 560       rearrange_sectors(r, r->start + diff, r->start, r->end - r->start);
 561       r->pos -= diff; r->start += diff; r->end += diff;
 562 #ifdef DEBUG
 563       show_recovery_buffer_map(r, "shifted up by %"PRIuSEC"", diff);
 564 #endif
 565     }
 566   } else if (pos > r->pos + r->end) {
 567       r->pos = pos; r->start = r->end = 0;
 568 #ifdef DEBUG
 569       show_recovery_buffer_map(r, "cleared; beyond previous region");
 570 #endif
 571   } else if (pos + want > r->pos + r->sz) {
 572     diff = (pos + want) - (r->pos + r->sz);
 573     if (r->end <= diff) {
 574       r->pos = pos; r->start = r->end = 0;
 575 #ifdef DEBUG
 576       show_recovery_buffer_map(r, "cleared; shift down by %"PRIuSEC"", diff);
 577 #endif
 578     } else {
 579       if (r->start < diff) r->start = diff;
 580       rearrange_sectors(r, r->start - diff, r->start, r->end - r->start);
 581       r->pos += diff; r->start -= diff; r->end -= diff;
 582 #ifdef DEBUG
 583       show_recovery_buffer_map(r, "shifted down by %"PRIuSEC"", diff);
 584 #endif
 585     }
 586   }
 587
 588   if (pos < r->pos + r->start) {
 589     pp = pos - r->pos; nn = r->start - pp;
 590 #ifdef DEBUG
 591     printf(";; read low (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")", pos, pp, nn);
 592     fflush(stdout);
 593 #endif
 594     n = recovery_read_sectors(r, pos, pp, nn);
 595 #ifdef DEBUG
 596     printf(" -> %zd\n", n);
 597 #endif
 598     if (n != nn) {
 599       if (n >= 0 && n > want) n = want;
 600       goto end;
 601     }
 602     r->start = pp;
 603 #ifdef DEBUG
 604     show_recovery_buffer_map(r, "joined new region");
 605 #endif
 606   }
 607
 608   if (pos + want > r->pos + r->end) {
 609     pp = r->end; nn = (pos + want) - (r->pos + r->end);
 610 #ifdef DEBUG
 611     printf(";; read high (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")",
 612            r->pos + pp, pp, nn);
 613 fflush(stdout);
 614 #endif
 615     n = recovery_read_sectors(r, pos + pp, pp, nn);
 616 #ifdef DEBUG
 617     printf(" -> %zd\n", n);
 618 #endif
 619     if (n > 0) {
 620       r->end += n;
 621 #ifdef DEBUG
 622       show_recovery_buffer_map(r, "joined new region");
 623 #endif
 624     }
 625   }
 626
 627   n = r->pos + r->end - pos;
 628   if (!n && want) n = -1;
 629
 630 end:
 631 #ifdef DEBUG
 632   show_recovery_buffer_map(r, "done; return %zd", n);
 633 #endif
 634   return (n);
 635 }
 636
 637 static secaddr run_length_wanted(secaddr pos, secaddr badlen,
 638                                  secaddr sz, secaddr end)
 639 {
 640   secaddr want;
 641
 642   want = 3*badlen/2;
 643   if (!want) want = 1;
 644   if (want > end - pos) want = end - pos;
 645   if (want > sz) want = sz;
 646   return (want);
 647 }
 648
 649 static ssize_t find_good_sector(secaddr *pos_inout, secaddr end,
 650                                 unsigned char *buf, secaddr sz)
 651 {
 652   int i;
 653   secaddr pos = *pos_inout, bad_lo, bad_hi, good, step, want;
 654   struct recoverybuf r;
 655   ssize_t n;
 656
 657   r.buf = buf; r.sz = sz; r.pos = r.start = r.end = 0;
 658   report_bad_blocks_progress(pos, pos, errno);
 659
 660   want = sz; if (want > end - pos) want = end - pos;
 661   for (i = 0; i < 4; i++) {
 662     n = recovery_read(&r, pos, want);
 663 #ifdef DEBUG
 664     clear_progress();
 665     printf(";; [retry] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 666            pos, pos + want, n);
 667 #endif
 668     if (n > 0) {
 669       clear_progress();
 670       moan("sector %"PRIuSEC" read ok after retry", pos);
 671       return (n);
 672     }
 673   }
 674
 675   bad_lo = pos; bad_hi = pos + 1;
 676   for (;;) {
 677     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 678     if (bad_hi >= end) {
 679       clear_progress();
 680       moan("giving up on this extent");
 681       recovered(bad_lo, end); *pos_inout = end; return (0);
 682     }
 683     step = 2*(bad_hi - bad_lo); if (step > end - bad_lo) step = end - bad_lo;
 684     pos = bad_lo + step - 1;
 685     want = run_length_wanted(pos, step, sz, end);
 686     n = recovery_read(&r, pos, want);
 687 #ifdef DEBUG
 688     clear_progress();
 689     printf(";; [bound] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 690            pos, pos + want, n);
 691 #endif
 692     if (n == want) break;
 693     if (n < 0) n = 0;
 694     bad_hi = pos + n + 1;
 695   }
 696
 697   good = pos;
 698   while (good > bad_hi) {
 699     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 700     pos = bad_hi + (good - bad_hi)/2;
 701     step = pos - bad_lo;
 702     want = run_length_wanted(pos, step, sz, end);
 703     n = recovery_read(&r, pos, want);
 704 #ifdef DEBUG
 705     clear_progress();
 706     printf(";; [limit] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 707            pos, pos + want, n);
 708 #endif
 709     if (n < 0) n = 0;
 710     if (n == want) good = pos;
 711     else bad_hi = pos + n + 1;
 712   }
 713   recovered(bad_lo, bad_hi); *pos_inout = good;
 714   if (good < r.pos + r.start || r.pos + r.end <= good)
 715     n = 0;
 716   else {
 717     n = r.pos + r.end - good;
 718     rearrange_sectors(&r, 0, good - r.pos, n);
 719   }
 720   return (n);
 721 }
 722
 723 static void emit(secaddr start, secaddr end)
 724 {
 725 #define BUFSECTORS 512
 726
 727   int least;
 728   unsigned char buf[BUFSECTORS*SECTORSZ];
 729   secaddr pos;
 730   size_t want;
 731   ssize_t n;
 732   static int first_time = 1;
 733 #ifdef DEBUG
 734   struct file *f;
 735   char fn[MAXFNSZ];
 736   int act = -1;
 737   int i;
 738 #endif
 739
 740   least = least_live();
 741
 742 #ifdef DEBUG
 743   printf(";; %8"PRIuSEC" .. %"PRIuSEC"\n", start, end);
 744
 745   for (i = 0; i < filetab.n; i++) {
 746     if (!livep(i)) continue;
 747     if (act == -1) act = i;
 748     f = &filetab.v[i]; store_filename(fn, f->id);
 749     printf(";;\t\t%8"PRIuSEC" .. %-8"PRIuSEC" %s\n",
 750            start - f->start, end - f->start, fn);
 751   }
 752   if (act == -1) printf(";;\t\t#<no live source>\n");
 753   assert(act == least);
 754 #endif
 755
 756   if (least == -1)
 757     { file = 0; vob = 0; }
 758   else {
 759     file = &filetab.v[least];
 760     switch (id_kind(file->id)) {
 761       case RAW:
 762         vob = 0;
 763         break;
 764       case VOB:
 765         if (first_time) { clear_progress(); first_time = 0; }
 766         vob = DVDOpenFile(dvd, id_title(file->id),
 767                           id_part(file->id)
 768                             ? DVD_READ_TITLE_VOBS
 769                             : DVD_READ_MENU_VOBS);
 770         if (!vob)
 771           bail("failed to open %s %u",
 772                id_part(file->id) ? "title" : "menu",
 773                id_title(file->id));
 774         break;
 775       default:
 776         abort();
 777     }
 778   }
 779
 780   pos = start;
 781   while (pos < end) {
 782     want = end - pos; if (want > BUFSECTORS) want = BUFSECTORS;
 783     n = read_sectors(pos, buf, want);
 784
 785     if (n <= 0) n = find_good_sector(&pos, end, buf, BUFSECTORS);
 786     if (n > 0) { carefully_write(outfd, buf, n*SECTORSZ); pos += n; }
 787     report_progress(pos); fflush(stdout);
 788   }
 789
 790   if (vob) { DVDCloseFile(vob); vob = 0; }
 791
 792 #undef BUFSECTORS
 793 }
 794
 795 #ifdef notdef
 796 static void logfn(void *p, dvd_logger_level_t lev,
 797                   const char *fmt, va_list ap)
 798 {
 799   switch (lev) {
 800     case DVD_LOGGER_LEVEL_ERROR:
 801       fprintf("%s (libdvdread error): ", prog);
 802       break;
 803     case DVD_LOGGER_LEVEL_WARN:
 804       fprintf("%s (libdvdread warning): ", prog);
 805       break;
 806     default:
 807       return;
 808   }
 809   vfprintf(stderr, fmt, ap);
 810   fputc('\n', stderr);
 811 }
 812 static const dvd_logger_cb logger = { logfn };
 813 #endif
 814
 815 struct buf {
 816   char *p;
 817   size_t n, sz;
 818 };
 819 #define BUF_INIT { 0, 0, 0 }
 820 #define BUF_REWIND(b) do { (b)->n = 0; } while (0)
 821 #define BUF_FREE(b) do {                                                \
 822   buf *_b = (b);                                                        \
 823   free(_b->p); _b->p = 0; _b->n = _b->sz = 0;                           \
 824 } while (0)
 825 #define BUF_PUTC(b, ch) do {                                            \
 826   struct buf *_b = (b);                                                 \
 827   if (_b->n >= _b->sz) {                                                \
 828     _b->sz = _b->sz ? 2*_b->sz : 32;                                    \
 829     _b->p = realloc(_b->p, _b->sz);                                     \
 830     if (!_b->p) bail("out of memory allocating %zu bytes", _b->sz);     \
 831   }                                                                     \
 832   _b->p[_b->n] = (ch);                                                  \
 833 } while (0)
 834
 835 static int read_line(FILE *fp, struct buf *b)
 836 {
 837   int ch;
 838
 839   ch = getc(fp);
 840   if (ch == EOF)
 841     return (-1);
 842   else if (ch != '\n') do {
 843     BUF_PUTC(b, ch); b->n++;
 844     ch = getc(fp);
 845   } while (ch != EOF && ch != '\n');
 846   BUF_PUTC(b, 0);
 847   return (0);
 848 }
 849
 850 #define PRF_HYPHEN 1u
 851 static int parse_range(const char *p, unsigned f,
 852                        secaddr *start_out, secaddr *end_out)
 853 {
 854   char *q;
 855   int err, rc;
 856   unsigned long start, end;
 857
 858   err = errno;
 859
 860   if (ISDIGIT(*p)) {
 861     start = strtoul(p, &q, 0);
 862     if (errno || start >= SECLIMIT) { rc = -1; goto end; }
 863     *start_out = start; p = q;
 864   } else if (!(f&PRF_HYPHEN))
 865     { rc = -1; goto end; }
 866   else
 867     start = 0;
 868
 869   if (f&PRF_HYPHEN) {
 870     if (*p != '-')  { rc = -1; goto end; }
 871     p++;
 872   } else {
 873     if (!ISSPACE(*p)) { rc = -1; goto end; }
 874     do p++; while (ISSPACE(*p));
 875   }
 876
 877   if (ISDIGIT(*p)) {
 878     end = strtoul(p, &q, 0);
 879     if (errno || end > SECLIMIT || end < start) { rc = -1; goto end; }
 880     *end_out = end; p = q;
 881   } else if (!(f&PRF_HYPHEN))
 882     { rc = -1; goto end; }
 883
 884   if (!(f&PRF_HYPHEN)) while (ISSPACE(*p)) p++;
 885   if (*p) { rc = -1; goto end; }
 886
 887   rc = 0;
 888 end:
 889   errno = err;
 890   return (rc);
 891 }
 892
 893 int main(int argc, char *argv[])
 894 {
 895   unsigned f = 0;
 896   char *p;
 897   uint64_t volsz;
 898   secaddr pos;
 899   off_t off;
 900   secaddr start, end, last;
 901   const struct event *ev;
 902   const char *device, *outfile;
 903   struct badblock *bad;
 904   int opt, blksz;
 905   unsigned n;
 906   size_t i;
 907   FILE *fp;
 908   struct buf buf = BUF_INIT;
 909   struct stat st;
 910 #ifdef DEBUG
 911   const struct file *file;
 912   char fn[MAXFNSZ];
 913 #endif
 914
 915 #define f_bogus 1u
 916 #define f_continue 2u
 917 #define f_fixup 4u
 918 #define f_write 256u
 919
 920   p = strrchr(argv[0], '/'); prog = p ? p + 1 : argv[0];
 921   for (;;) {
 922     opt = getopt(argc, argv, "hFR:X:b:cr:"); if (opt < 0) break;
 923     switch (opt) {
 924       case 'h': usage(stderr); exit(0);
 925       case 'F': f |= f_fixup; break;
 926       case 'R':
 927         fp = fopen(optarg, "r");
 928         if (!fp)
 929           bail_syserr(errno, "failed to open ranges file `%s'", optarg);
 930         i = 0; last = -1;
 931         for (;;) {
 932           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
 933           p = buf.p; i++;
 934           while (ISSPACE(*p)) p++;
 935           if (!*p || *p == '#') continue;
 936           if (parse_range(p, 0, &start, &end) ||
 937               (last <= SECLIMIT && start < last))
 938             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
 939           if (start < end) {
 940             if (start == last)
 941               eventq.v[eventq.n - 1].pos = end;
 942             else {
 943               put_event(EV_WRITE, 0, start);
 944               put_event(EV_STOP, 0, end);
 945             }
 946             last = end;
 947           }
 948         }
 949         if (ferror(fp))
 950           bail_syserr(errno, "failed to read ranges file `%s'", optarg);
 951         break;
 952       case 'X':
 953         fp = fopen(optarg, "r");
 954         if (!fp)
 955           bail_syserr(errno, "failed to open bad-blocks file `%s'", optarg);
 956         i = 0; last = -1;
 957         for (;;) {
 958           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
 959           p = buf.p; i++;
 960           while (ISSPACE(*p)) p++;
 961           if (!*p || *p == '#') continue;
 962           if (parse_range(p, 0, &start, &end) ||
 963               (last <= SECLIMIT && start < last))
 964             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
 965           if (start < end)
 966             { VEC_PUSH(bad, &badblocks); bad->start = start; bad->end = end; }
 967         }
 968         if (ferror(fp))
 969           bail_syserr(errno, "failed to read bad-blocks file `%s'", optarg);
 970         break;
 971       case 'b':
 972         if (mapfile) bail("can't have multiple map files");
 973         mapfile = optarg;
 974         break;
 975       case 'c': f |= f_continue; break;
 976       case 'r':
 977         start = 0; end = -1;
 978         if (parse_range(optarg, PRF_HYPHEN, &start, &end))
 979           bail("bad range `%s'", optarg);
 980         if (start < end) {
 981           put_event(EV_WRITE, 0, start);
 982           if (end <= SECLIMIT) put_event(EV_STOP, 0, end);
 983         }
 984         break;
 985       default: f |= f_bogus; break;
 986     }
 987   }
 988   if (argc - optind != 2) f |= f_bogus;
 989   if (f&f_bogus) { usage(stderr); exit(2); }
 990
 991   device = argv[optind]; outfile = argv[optind + 1];
 992
 993   if (badblocks.n) {
 994     qsort(badblocks.v, badblocks.n, sizeof(struct badblock),
 995           compare_badblock);
 996 #ifdef DEBUG
 997     printf(";; fake bad blocks:\n");
 998     for (i = 0; i < badblocks.n; i++)
 999       printf(";;\t%8"PRIuSEC" .. %"PRIuSEC"\n",
1000              badblocks.v[i].start, badblocks.v[i].end);
1001 #endif
1002   }
1003
1004   dvdfd = open(device, O_RDONLY);
1005   if (dvdfd < 0)
1006     bail_syserr(errno, "failed to open device `%s'", device);
1007   if (fstat(dvdfd, &st))
1008     bail_syserr(errno, "failed to stat device `%s'", device);
1009   if (S_ISREG(st.st_mode)) {
1010     blksz = SECTORSZ;
1011     volsz = st.st_size;
1012   } else if (S_ISBLK(st.st_mode)) {
1013     if (ioctl(dvdfd, BLKSSZGET, &blksz))
1014       bail_syserr(errno, "failed to get block size for `%s'", device);
1015     if (ioctl(dvdfd, BLKGETSIZE64, &volsz))
1016       bail_syserr(errno, "failed to get volume size for `%s'", device);
1017   } else
1018     bail("can't use `%s' as source: expected file or block device", device);
1019
1020   if (blksz != SECTORSZ)
1021     bail("device `%s' block size %d /= %d", device, blksz, SECTORSZ);
1022   if (volsz%SECTORSZ)
1023     bail("device `%s' volume size %"PRIu64" not a multiple of %d",
1024          device, volsz, SECTORSZ);
1025
1026   if (outfile) {
1027     outfd = open(outfile, O_WRONLY | O_CREAT, 0666);
1028     if (outfd < 0)
1029       bail_syserr(errno, "failed to create output file `%s'", outfile);
1030   }
1031
1032   if (f&f_continue) {
1033     off = lseek(outfd, 0, SEEK_END);
1034     if (off < 0)
1035       bail_syserr(errno, "failed to seek to end of output file `%s'",
1036                   outfile);
1037     put_event(EV_WRITE, 0, off/SECTORSZ);
1038   } else if (!eventq.n && !(f&f_fixup))
1039     put_event(EV_WRITE, 0, 0);
1040
1041 #ifdef notdef
1042   dvd = DVDOpen2(0, &logger, device);
1043 #else
1044   dvd = DVDOpen(device);
1045 #endif
1046   if (!dvd) bail("failed to open DVD on `%s'", device);
1047
1048   /* It's fast enough just to check everything. */
1049   put_menu(dvd, 0);
1050   for (i = 1; i < 100; i++) {
1051     put_menu(dvd, i);
1052     put_title(dvd, i);
1053   }
1054   put_file(mkident(RAW, 0, 0), 0, volsz/SECTORSZ);
1055   assert(filetab.n <= MAXFILES);
1056
1057   for (i = 0, limit = 0; i < filetab.n; i++)
1058     if (filetab.v[i].end > limit) limit = filetab.v[i].end;
1059
1060   if (end > limit) end = limit;
1061
1062 #ifdef DEBUG
1063   printf("\n;; files:\n");
1064   for (i = 0; i < filetab.n; i++) {
1065     file = &filetab.v[i];
1066     store_filename(fn, file->id);
1067     printf(";;\t%8"PRIuSEC" %s\n", file->start, fn);
1068   }
1069 #endif
1070
1071   qsort(eventq.v, eventq.n, sizeof(struct event), compare_event);
1072
1073   f &= ~f_write; start = 0; n = 0;
1074   for (i = 0; i < eventq.n; i++) {
1075     ev = &eventq.v[i];
1076     switch (ev->ev) {
1077       case EV_WRITE:
1078         if (f&f_write)
1079           bail("overlapping ranges: range from %"PRIuSEC" still open at %"PRIuSEC"",
1080                start, ev->pos);
1081         n++; f |= f_write; start = ev->pos;
1082         break;
1083       case EV_STOP:
1084         f &= ~f_write;
1085         break;
1086     }
1087   }
1088
1089   f &= ~f_write; start = 0;
1090   for (i = 0; i < eventq.n; i++) {
1091     ev = &eventq.v[i];
1092     switch (ev->ev) {
1093       case EV_WRITE: start = ev->pos; f |= f_write; break;
1094       case EV_STOP: nsectors += ev->pos - start; f &= ~f_write; break;
1095     }
1096     if (ev->pos >= limit) break;
1097     if (f&f_fixup) start = ev->pos;
1098   }
1099   eventq.n = i;
1100   if (f&f_fixup) {
1101     put_event(EV_WRITE, 0, start);
1102     n++; f |= f_write;
1103   }
1104   if (f&f_write) {
1105     nsectors += limit - start;
1106     put_event(EV_STOP, 0, limit);
1107   }
1108   if (n == 1 && (f&f_write)) flags |= F_ALLPROGRESS;
1109   f &= ~f_write;
1110
1111 #ifdef DEBUG
1112   printf("\n;; event sweep:\n");
1113 #endif
1114   for (pos = 0, i = 0; i < eventq.n; i++) {
1115     ev = &eventq.v[i];
1116     if (ev->pos > pos) {
1117       if (f&f_write) emit(pos, ev->pos);
1118       pos = ev->pos;
1119 #ifdef DEBUG
1120       clear_progress();
1121       printf(";;\n");
1122 #endif
1123     }
1124     switch (ev->ev) {
1125       case EV_BEGIN:
1126         set_live(ev->file);
1127 #ifdef DEBUG
1128         store_filename(fn, filetab.v[ev->file].id);
1129         clear_progress();
1130         printf(";; %8"PRIuSEC": begin `%s'\n", pos, fn);
1131 #endif
1132         break;
1133       case EV_WRITE:
1134         gettimeofday(&last_time, 0); last_pos = pos;
1135         if (lseek(outfd, (off_t)ev->pos*SECTORSZ, SEEK_SET) < 0)
1136           bail_syserr(errno,
1137                       "failed to seek to resume position "
1138                       "(sector %"PRIuSEC") in output file `%s'",
1139                       ev->pos, outfile);
1140 #ifdef DEBUG
1141         clear_progress();
1142         printf(";; %8"PRIuSEC": begin write\n", pos);
1143 #endif
1144         f |= f_write;
1145         break;
1146       case EV_STOP:
1147         f &= ~f_write;
1148 #ifdef DEBUG
1149         clear_progress();
1150         printf(";; %8"PRIuSEC": end write\n", pos);
1151 #endif
1152         break;
1153       case EV_END:
1154         clear_live(ev->file);
1155 #ifdef DEBUG
1156         store_filename(fn, filetab.v[ev->file].id);
1157         clear_progress();
1158         printf(";; %8"PRIuSEC": end `%s'\n", pos, fn);
1159 #endif
1160         break;
1161       default: abort();
1162     }
1163   }
1164
1165   if (progresslen) putchar('\n');
1166
1167   if (ftruncate(outfd, (off_t)limit*SECTORSZ) < 0)
1168     bail_syserr(errno, "failed to set output file `%s' length", outfile);
1169
1170   if (dvd) DVDClose(dvd);
1171   if (dvdfd >= 0) close(dvdfd);
1172   if (outfd >= 0) close(outfd);
1173   if (mapfp) {
1174     if (ferror(mapfp) || fclose(mapfp))
1175       bail_syserr(errno, "error writing bad-sector map file");
1176   }
1177
1178 #undef f_bogus
1179 #undef f_continue
1180 #undef f_fixup
1181 #undef f_write
1182
1183   return (status);
1184 }