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)
 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   status = 1;
 528 }
 529
 530 struct recoverybuf {
 531   unsigned char *buf;
 532   secaddr sz, pos, start, end;
 533 };
 534
 535 static void rearrange_sectors(struct recoverybuf *r,
 536                               secaddr dest, secaddr src, secaddr len)
 537 {
 538   assert(dest + len <= r->sz);
 539   assert(src + len <= r->sz);
 540   memmove(r->buf + dest*SECTORSZ, r->buf + src*SECTORSZ, len*SECTORSZ);
 541 }
 542
 543 #ifdef DEBUG
 544 __attribute__((format(printf, 2, 3)))
 545 static void show_recovery_buffer_map(const struct recoverybuf *r,
 546                                      const char *what, ...)
 547 {
 548   va_list ap;
 549
 550   va_start(ap, what);
 551   debug_clear_progress();
 552   printf(";; recovery buffer (");
 553   vprintf(what, ap);
 554   printf("): "
 555          "(%"PRIuSEC") ..%"PRIuSEC".. "
 556          "[%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"] "
 557          "..%"PRIuSEC".. (%"PRIuSEC")\n",
 558          r->pos, r->start,
 559          r->pos + r->start, r->end - r->start, r->pos + r->end,
 560          r->sz - r->end, r->pos + r->sz);
 561   va_end(ap);
 562   assert(r->start <= r->end);
 563   assert(r->end <= r->sz);
 564 }
 565 #endif
 566
 567 static ssize_t recovery_read_sectors(struct recoverybuf *r,
 568                                      secaddr pos, secaddr off, secaddr want)
 569 {
 570   ssize_t n;
 571
 572   assert(off <= r->sz); assert(want <= r->sz - off);
 573   n = read_sectors(pos, r->buf + off*SECTORSZ, want);
 574   return (n);
 575 }
 576
 577 static ssize_t recovery_read(struct recoverybuf *r,
 578                              secaddr pos, secaddr want)
 579 {
 580   secaddr diff, pp, nn;
 581   ssize_t n;
 582
 583 #ifdef DEBUG
 584   debug_clear_progress();
 585   show_recovery_buffer_map(r, "begin(%"PRIuSEC", %"PRIuSEC")", pos, want);
 586 #endif
 587
 588   if (pos < r->pos) {
 589     diff = r->pos - pos;
 590     if (r->start + diff >= r->sz) {
 591       r->pos = pos; r->start = r->end = 0;
 592 #ifdef DEBUG
 593       show_recovery_buffer_map(r, "cleared; shift up by %"PRIuSEC"", diff);
 594 #endif
 595     } else {
 596       if (r->end + diff > r->sz) r->end = r->sz - diff;
 597       rearrange_sectors(r, r->start + diff, r->start, r->end - r->start);
 598       r->pos -= diff; r->start += diff; r->end += diff;
 599 #ifdef DEBUG
 600       show_recovery_buffer_map(r, "shifted up by %"PRIuSEC"", diff);
 601 #endif
 602     }
 603   } else if (pos > r->pos + r->end) {
 604       r->pos = pos; r->start = r->end = 0;
 605 #ifdef DEBUG
 606       show_recovery_buffer_map(r, "cleared; beyond previous region");
 607 #endif
 608   } else if (pos + want > r->pos + r->sz) {
 609     diff = (pos + want) - (r->pos + r->sz);
 610     if (r->end <= diff) {
 611       r->pos = pos; r->start = r->end = 0;
 612 #ifdef DEBUG
 613       show_recovery_buffer_map(r, "cleared; shift down by %"PRIuSEC"", diff);
 614 #endif
 615     } else {
 616       if (r->start < diff) r->start = diff;
 617       rearrange_sectors(r, r->start - diff, r->start, r->end - r->start);
 618       r->pos += diff; r->start -= diff; r->end -= diff;
 619 #ifdef DEBUG
 620       show_recovery_buffer_map(r, "shifted down by %"PRIuSEC"", diff);
 621 #endif
 622     }
 623   }
 624
 625   if (pos < r->pos + r->start) {
 626     pp = pos - r->pos; nn = r->start - pp;
 627 #ifdef DEBUG
 628     printf(";; read low (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")", pos, pp, nn);
 629     fflush(stdout);
 630 #endif
 631     n = recovery_read_sectors(r, pos, pp, nn);
 632 #ifdef DEBUG
 633     printf(" -> %zd\n", n);
 634 #endif
 635     if (n != nn) {
 636       if (n >= 0 && n > want) n = want;
 637       goto end;
 638     }
 639     r->start = pp;
 640 #ifdef DEBUG
 641     show_recovery_buffer_map(r, "joined new region");
 642 #endif
 643   }
 644
 645   if (pos + want > r->pos + r->end) {
 646     pp = r->end; nn = (pos + want) - (r->pos + r->end);
 647 #ifdef DEBUG
 648     printf(";; read high (%"PRIuSEC"@%"PRIuSEC", %"PRIuSEC")",
 649            r->pos + pp, pp, nn);
 650     fflush(stdout);
 651 #endif
 652     n = recovery_read_sectors(r, r->pos + pp, pp, nn);
 653 #ifdef DEBUG
 654     printf(" -> %zd\n", n);
 655 #endif
 656     if (n > 0) {
 657       r->end += n;
 658 #ifdef DEBUG
 659       show_recovery_buffer_map(r, "joined new region");
 660 #endif
 661     }
 662   }
 663
 664   n = r->pos + r->end - pos;
 665   if (!n && want) n = -1;
 666   else if (n > want) n = want;
 667
 668 end:
 669 #ifdef DEBUG
 670   show_recovery_buffer_map(r, "done; return %zd", n);
 671 #endif
 672   return (n);
 673 }
 674
 675 static secaddr run_length_wanted(secaddr pos, secaddr badlen,
 676                                  secaddr sz, secaddr end)
 677 {
 678   secaddr want;
 679
 680   want = 3*badlen/2;
 681   if (!want) want = 1;
 682   if (want > end - pos) want = end - pos;
 683   if (want > sz) want = sz;
 684   return (want);
 685 }
 686
 687 static ssize_t find_good_sector(secaddr *pos_inout, secaddr end,
 688                                 unsigned char *buf, secaddr sz)
 689 {
 690   int i;
 691   secaddr pos = *pos_inout, bad_lo, bad_hi, good, step, want;
 692   struct recoverybuf r;
 693   ssize_t n;
 694
 695   r.buf = buf; r.sz = sz; r.pos = r.start = r.end = 0;
 696   report_bad_blocks_progress(pos, pos, errno);
 697
 698   want = sz; if (want > end - pos) want = end - pos;
 699   for (i = 0; i < 4; i++) {
 700     n = recovery_read(&r, pos, want);
 701 #ifdef DEBUG
 702     debug_clear_progress();
 703     printf(";; [retry] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 704            pos, pos + want, n);
 705 #endif
 706     if (n > 0) {
 707       clear_progress();
 708       moan("sector %"PRIuSEC" read ok after retry", pos);
 709       return (n);
 710     }
 711   }
 712
 713   bad_lo = pos; bad_hi = pos + 1;
 714   for (;;) {
 715     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 716 #ifdef DEBUG
 717     debug_clear_progress();
 718     printf(";; bounding bad-block region: "
 719            "%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"\n",
 720            bad_lo, bad_hi - bad_lo, bad_hi);
 721 #endif
 722     if (bad_hi >= end) {
 723       clear_progress();
 724       moan("giving up on this extent");
 725       recovered(bad_lo, end); *pos_inout = end; return (0);
 726     }
 727     step = 2*(bad_hi - bad_lo); if (step > end - bad_lo) step = end - bad_lo;
 728     pos = bad_lo + step - 1;
 729     want = run_length_wanted(pos, step, sz, end);
 730     n = recovery_read(&r, pos, want);
 731 #ifdef DEBUG
 732     printf(";; [bound] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 733            pos, pos + want, n);
 734 #endif
 735     if (n == want) break;
 736     if (n < 0) n = 0;
 737     bad_hi = pos + n + 1;
 738   }
 739
 740   good = pos;
 741   while (good > bad_hi) {
 742     report_bad_blocks_progress(bad_lo, bad_hi, errno);
 743 #ifdef DEBUG
 744     debug_clear_progress();
 745     printf(";; limiting bad-block region: "
 746            "%"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC" ..%"PRIuSEC".. %"PRIuSEC"\n",
 747            bad_lo, bad_hi - bad_lo, bad_hi, good - bad_hi, good);
 748 #endif
 749     pos = bad_hi + (good - bad_hi)/2;
 750     step = pos - bad_lo;
 751     want = run_length_wanted(pos, step, sz, end);
 752     n = recovery_read(&r, pos, want);
 753 #ifdef DEBUG
 754     printf(";; [limit] try reading %"PRIuSEC" .. %"PRIuSEC" -> %zd\n",
 755            pos, pos + want, n);
 756 #endif
 757     if (n < 0) n = 0;
 758     if (n == want) good = pos;
 759     else bad_hi = pos + n + 1;
 760   }
 761   recovered(bad_lo, bad_hi); *pos_inout = good;
 762   if (good < r.pos + r.start || r.pos + r.end <= good)
 763     n = 0;
 764   else {
 765     n = r.pos + r.end - good;
 766     rearrange_sectors(&r, 0, good - r.pos, n);
 767   }
 768 #ifdef DEBUG
 769   show_recovery_buffer_map(&r, "returning %zd good sectors at %"PRIuSEC"",
 770                            n, good);
 771 #endif
 772   return (n);
 773 }
 774
 775 static void emit(secaddr start, secaddr end)
 776 {
 777 #define BUFSECTORS 512
 778
 779   int least;
 780   unsigned char buf[BUFSECTORS*SECTORSZ];
 781   secaddr pos;
 782   size_t want;
 783   ssize_t n;
 784   static int first_time = 1;
 785 #ifdef DEBUG
 786   struct file *f;
 787   char fn[MAXFNSZ];
 788   int act = -1;
 789   int i;
 790 #endif
 791
 792   least = least_live();
 793
 794 #ifdef DEBUG
 795   printf(";; %8"PRIuSEC" .. %"PRIuSEC"\n", start, end);
 796
 797   for (i = 0; i < filetab.n; i++) {
 798     if (!livep(i)) continue;
 799     if (act == -1) act = i;
 800     f = &filetab.v[i]; store_filename(fn, f->id);
 801     printf(";;\t\t%8"PRIuSEC" .. %-8"PRIuSEC" %s\n",
 802            start - f->start, end - f->start, fn);
 803   }
 804   if (act == -1) printf(";;\t\t#<no live source>\n");
 805   assert(act == least);
 806 #endif
 807
 808   if (least == -1)
 809     { file = 0; vob = 0; }
 810   else {
 811     file = &filetab.v[least];
 812     switch (id_kind(file->id)) {
 813       case RAW:
 814         vob = 0;
 815         break;
 816       case VOB:
 817         if (first_time) { clear_progress(); first_time = 0; }
 818         vob = DVDOpenFile(dvd, id_title(file->id),
 819                           id_part(file->id)
 820                             ? DVD_READ_TITLE_VOBS
 821                             : DVD_READ_MENU_VOBS);
 822         if (!vob)
 823           bail("failed to open %s %u",
 824                id_part(file->id) ? "title" : "menu",
 825                id_title(file->id));
 826         break;
 827       default:
 828         abort();
 829     }
 830   }
 831
 832   pos = start;
 833   while (pos < end) {
 834     want = end - pos; if (want > BUFSECTORS) want = BUFSECTORS;
 835     n = read_sectors(pos, buf, want);
 836
 837     if (n <= 0) n = find_good_sector(&pos, end, buf, BUFSECTORS);
 838     if (n > 0) { carefully_write(outfd, buf, n*SECTORSZ); pos += n; }
 839     report_progress(pos); fflush(stdout);
 840   }
 841
 842   if (vob) { DVDCloseFile(vob); vob = 0; }
 843
 844 #undef BUFSECTORS
 845 }
 846
 847 #ifdef notdef
 848 static void logfn(void *p, dvd_logger_level_t lev,
 849                   const char *fmt, va_list ap)
 850 {
 851   switch (lev) {
 852     case DVD_LOGGER_LEVEL_ERROR:
 853       fprintf("%s (libdvdread error): ", prog);
 854       break;
 855     case DVD_LOGGER_LEVEL_WARN:
 856       fprintf("%s (libdvdread warning): ", prog);
 857       break;
 858     default:
 859       return;
 860   }
 861   vfprintf(stderr, fmt, ap);
 862   fputc('\n', stderr);
 863 }
 864 static const dvd_logger_cb logger = { logfn };
 865 #endif
 866
 867 struct buf {
 868   char *p;
 869   size_t n, sz;
 870 };
 871 #define BUF_INIT { 0, 0, 0 }
 872 #define BUF_REWIND(b) do { (b)->n = 0; } while (0)
 873 #define BUF_FREE(b) do {                                                \
 874   buf *_b = (b);                                                        \
 875   free(_b->p); _b->p = 0; _b->n = _b->sz = 0;                           \
 876 } while (0)
 877 #define BUF_PUTC(b, ch) do {                                            \
 878   struct buf *_b = (b);                                                 \
 879   if (_b->n >= _b->sz) {                                                \
 880     _b->sz = _b->sz ? 2*_b->sz : 32;                                    \
 881     _b->p = realloc(_b->p, _b->sz);                                     \
 882     if (!_b->p) bail("out of memory allocating %zu bytes", _b->sz);     \
 883   }                                                                     \
 884   _b->p[_b->n] = (ch);                                                  \
 885 } while (0)
 886
 887 static int read_line(FILE *fp, struct buf *b)
 888 {
 889   int ch;
 890
 891   ch = getc(fp);
 892   if (ch == EOF)
 893     return (-1);
 894   else if (ch != '\n') do {
 895     BUF_PUTC(b, ch); b->n++;
 896     ch = getc(fp);
 897   } while (ch != EOF && ch != '\n');
 898   BUF_PUTC(b, 0);
 899   return (0);
 900 }
 901
 902 #define PRF_HYPHEN 1u
 903 static int parse_range(const char *p, unsigned f,
 904                        secaddr *start_out, secaddr *end_out)
 905 {
 906   char *q;
 907   int err, rc;
 908   unsigned long start, end;
 909
 910   err = errno;
 911
 912   if (ISDIGIT(*p)) {
 913     start = strtoul(p, &q, 0);
 914     if (errno || start >= SECLIMIT) { rc = -1; goto end; }
 915     *start_out = start; p = q;
 916   } else if (!(f&PRF_HYPHEN))
 917     { rc = -1; goto end; }
 918   else
 919     start = 0;
 920
 921   if (f&PRF_HYPHEN) {
 922     if (*p != '-')  { rc = -1; goto end; }
 923     p++;
 924   } else {
 925     if (!ISSPACE(*p)) { rc = -1; goto end; }
 926     do p++; while (ISSPACE(*p));
 927   }
 928
 929   if (ISDIGIT(*p)) {
 930     end = strtoul(p, &q, 0);
 931     if (errno || end > SECLIMIT || end < start) { rc = -1; goto end; }
 932     *end_out = end; p = q;
 933   } else if (!(f&PRF_HYPHEN))
 934     { rc = -1; goto end; }
 935
 936   if (!(f&PRF_HYPHEN)) while (ISSPACE(*p)) p++;
 937   if (*p && ((f&PRF_HYPHEN) || *p != '=')) { rc = -1; goto end; }
 938
 939   rc = 0;
 940 end:
 941   errno = err;
 942   return (rc);
 943 }
 944
 945 int main(int argc, char *argv[])
 946 {
 947   unsigned f = 0;
 948   char *p;
 949   uint64_t volsz;
 950   secaddr pos;
 951   off_t off;
 952   secaddr start, end, last;
 953   const struct event *ev;
 954   const char *device, *outfile;
 955   struct badblock *bad;
 956   int opt, blksz;
 957   unsigned n;
 958   size_t i;
 959   FILE *fp;
 960   struct buf buf = BUF_INIT;
 961   struct stat st;
 962 #ifdef DEBUG
 963   const struct file *file;
 964   char fn[MAXFNSZ];
 965 #endif
 966
 967 #define f_bogus 1u
 968 #define f_continue 2u
 969 #define f_fixup 4u
 970 #define f_write 256u
 971
 972   p = strrchr(argv[0], '/'); prog = p ? p + 1 : argv[0];
 973   for (;;) {
 974     opt = getopt(argc, argv, "hE:FR:X:b:cr:"); if (opt < 0) break;
 975     switch (opt) {
 976       case 'h': usage(stderr); exit(0);
 977       case 'E': errfile = optarg; break;
 978       case 'F': f |= f_fixup; break;
 979       case 'R':
 980         fp = fopen(optarg, "r");
 981         if (!fp)
 982           bail_syserr(errno, "failed to open ranges file `%s'", optarg);
 983         i = 0; last = -1;
 984         for (;;) {
 985           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
 986           p = buf.p; i++;
 987           while (ISSPACE(*p)) p++;
 988           if (!*p || *p == '#') continue;
 989           if (parse_range(p, 0, &start, &end) ||
 990               (last <= SECLIMIT && start < last))
 991             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
 992           if (start < end) {
 993             if (start == last)
 994               eventq.v[eventq.n - 1].pos = end;
 995             else {
 996               put_event(EV_WRITE, 0, start);
 997               put_event(EV_STOP, 0, end);
 998             }
 999             last = end;
1000           }
1001         }
1002         if (ferror(fp))
1003           bail_syserr(errno, "failed to read ranges file `%s'", optarg);
1004         break;
1005       case 'X':
1006         fp = fopen(optarg, "r");
1007         if (!fp)
1008           bail_syserr(errno, "failed to open bad-blocks file `%s'", optarg);
1009         i = 0; last = -1;
1010         for (;;) {
1011           BUF_REWIND(&buf); if (read_line(fp, &buf)) break;
1012           p = buf.p; i++;
1013           while (ISSPACE(*p)) p++;
1014           if (!*p || *p == '#') continue;
1015           if (parse_range(p, 0, &start, &end) ||
1016               (last <= SECLIMIT && start < last))
1017             bail("bad range `%s' at `%s' line %zu", buf.p, optarg, i);
1018           if (start < end)
1019             { VEC_PUSH(bad, &badblocks); bad->start = start; bad->end = end; }
1020         }
1021         if (ferror(fp))
1022           bail_syserr(errno, "failed to read bad-blocks file `%s'", optarg);
1023         break;
1024       case 'b':
1025         if (mapfile) bail("can't have multiple map files");
1026         mapfile = optarg;
1027         break;
1028       case 'c': f |= f_continue; break;
1029       case 'r':
1030         start = 0; end = -1;
1031         if (parse_range(optarg, PRF_HYPHEN, &start, &end))
1032           bail("bad range `%s'", optarg);
1033         if (start < end) {
1034           put_event(EV_WRITE, 0, start);
1035           if (end <= SECLIMIT) put_event(EV_STOP, 0, end);
1036         }
1037         break;
1038       default: f |= f_bogus; break;
1039     }
1040   }
1041   if (argc - optind != 2) f |= f_bogus;
1042   if (f&f_bogus) { usage(stderr); exit(2); }
1043
1044   device = argv[optind]; outfile = argv[optind + 1];
1045
1046   if (badblocks.n) {
1047     qsort(badblocks.v, badblocks.n, sizeof(struct badblock),
1048           compare_badblock);
1049 #ifdef DEBUG
1050     printf(";; fake bad blocks:\n");
1051     for (i = 0; i < badblocks.n; i++)
1052       printf(";;\t%8"PRIuSEC" .. %"PRIuSEC"\n",
1053              badblocks.v[i].start, badblocks.v[i].end);
1054 #endif
1055   }
1056
1057   dvdfd = open(device, O_RDONLY);
1058   if (dvdfd < 0)
1059     bail_syserr(errno, "failed to open device `%s'", device);
1060   if (fstat(dvdfd, &st))
1061     bail_syserr(errno, "failed to stat device `%s'", device);
1062   if (S_ISREG(st.st_mode)) {
1063     blksz = SECTORSZ;
1064     volsz = st.st_size;
1065   } else if (S_ISBLK(st.st_mode)) {
1066     if (ioctl(dvdfd, BLKSSZGET, &blksz))
1067       bail_syserr(errno, "failed to get block size for `%s'", device);
1068     if (ioctl(dvdfd, BLKGETSIZE64, &volsz))
1069       bail_syserr(errno, "failed to get volume size for `%s'", device);
1070   } else
1071     bail("can't use `%s' as source: expected file or block device", device);
1072
1073   if (blksz != SECTORSZ)
1074     bail("device `%s' block size %d /= %d", device, blksz, SECTORSZ);
1075   if (volsz%SECTORSZ)
1076     bail("device `%s' volume size %"PRIu64" not a multiple of %d",
1077          device, volsz, SECTORSZ);
1078
1079   if (outfile) {
1080     outfd = open(outfile, O_WRONLY | O_CREAT, 0666);
1081     if (outfd < 0)
1082       bail_syserr(errno, "failed to create output file `%s'", outfile);
1083   }
1084
1085   if (f&f_continue) {
1086     off = lseek(outfd, 0, SEEK_END);
1087     if (off < 0)
1088       bail_syserr(errno, "failed to seek to end of output file `%s'",
1089                   outfile);
1090     put_event(EV_WRITE, 0, off/SECTORSZ);
1091   } else if (!eventq.n && !(f&f_fixup))
1092     put_event(EV_WRITE, 0, 0);
1093
1094 #ifdef notdef
1095   dvd = DVDOpen2(0, &logger, device);
1096 #else
1097   dvd = DVDOpen(device);
1098 #endif
1099   if (!dvd) bail("failed to open DVD on `%s'", device);
1100
1101   /* It's fast enough just to check everything. */
1102   put_menu(dvd, 0);
1103   for (i = 1; i < 100; i++) {
1104     put_menu(dvd, i);
1105     put_title(dvd, i);
1106   }
1107   put_file(mkident(RAW, 0, 0), 0, volsz/SECTORSZ);
1108   assert(filetab.n <= MAXFILES);
1109
1110   for (i = 0, limit = 0; i < filetab.n; i++)
1111     if (filetab.v[i].end > limit) limit = filetab.v[i].end;
1112
1113   if (end > limit) end = limit;
1114
1115 #ifdef DEBUG
1116   printf("\n;; files:\n");
1117   for (i = 0; i < filetab.n; i++) {
1118     file = &filetab.v[i];
1119     store_filename(fn, file->id);
1120     printf(";;\t%8"PRIuSEC" %s\n", file->start, fn);
1121   }
1122 #endif
1123
1124   qsort(eventq.v, eventq.n, sizeof(struct event), compare_event);
1125
1126   f &= ~f_write; start = 0; n = 0;
1127   for (i = 0; i < eventq.n; i++) {
1128     ev = &eventq.v[i];
1129     switch (ev->ev) {
1130       case EV_WRITE:
1131         if (f&f_write)
1132           bail("overlapping ranges: range from %"PRIuSEC" still open at %"PRIuSEC"",
1133                start, ev->pos);
1134         n++; f |= f_write; start = ev->pos;
1135         break;
1136       case EV_STOP:
1137         f &= ~f_write;
1138         break;
1139     }
1140   }
1141
1142   f &= ~f_write; start = 0;
1143   for (i = 0; i < eventq.n; i++) {
1144     ev = &eventq.v[i];
1145     switch (ev->ev) {
1146       case EV_WRITE: start = ev->pos; f |= f_write; break;
1147       case EV_STOP: nsectors += ev->pos - start; f &= ~f_write; break;
1148     }
1149     if (ev->pos >= limit) break;
1150     if (f&f_fixup) start = ev->pos;
1151   }
1152   eventq.n = i;
1153   if (f&f_fixup) {
1154     put_event(EV_WRITE, 0, start);
1155     n++; f |= f_write;
1156   }
1157   if (f&f_write) {
1158     nsectors += limit - start;
1159     put_event(EV_STOP, 0, limit);
1160   }
1161   if (n == 1 && (f&f_write)) flags |= F_ALLPROGRESS;
1162   f &= ~f_write;
1163
1164 #ifdef DEBUG
1165   printf("\n;; event sweep:\n");
1166 #endif
1167   for (pos = 0, i = 0; i < eventq.n; i++) {
1168     ev = &eventq.v[i];
1169     if (ev->pos > pos) {
1170       if (f&f_write) emit(pos, ev->pos);
1171       pos = ev->pos;
1172 #ifdef DEBUG
1173       debug_clear_progress();
1174       printf(";;\n");
1175 #endif
1176     }
1177     switch (ev->ev) {
1178       case EV_BEGIN:
1179         set_live(ev->file);
1180 #ifdef DEBUG
1181         store_filename(fn, filetab.v[ev->file].id);
1182         debug_clear_progress();
1183         printf(";; %8"PRIuSEC": begin `%s'\n", pos, fn);
1184 #endif
1185         break;
1186       case EV_WRITE:
1187         gettimeofday(&last_time, 0); last_pos = pos;
1188         if (lseek(outfd, (off_t)ev->pos*SECTORSZ, SEEK_SET) < 0)
1189           bail_syserr(errno,
1190                       "failed to seek to resume position "
1191                       "(sector %"PRIuSEC") in output file `%s'",
1192                       ev->pos, outfile);
1193 #ifdef DEBUG
1194         debug_clear_progress();
1195         printf(";; %8"PRIuSEC": begin write\n", pos);
1196 #endif
1197         f |= f_write;
1198         break;
1199       case EV_STOP:
1200         f &= ~f_write;
1201 #ifdef DEBUG
1202         debug_clear_progress();
1203         printf(";; %8"PRIuSEC": end write\n", pos);
1204 #endif
1205         break;
1206       case EV_END:
1207         clear_live(ev->file);
1208 #ifdef DEBUG
1209         store_filename(fn, filetab.v[ev->file].id);
1210         debug_clear_progress();
1211         printf(";; %8"PRIuSEC": end `%s'\n", pos, fn);
1212 #endif
1213         break;
1214       default: abort();
1215     }
1216   }
1217
1218   if (progresslen) putchar('\n');
1219
1220   if (ftruncate(outfd, (off_t)limit*SECTORSZ) < 0)
1221     bail_syserr(errno, "failed to set output file `%s' length", outfile);
1222
1223   if (dvd) DVDClose(dvd);
1224   if (dvdfd >= 0) close(dvdfd);
1225   if (outfd >= 0) close(outfd);
1226   carefully_fclose(mapfp, "bad-sector region map");
1227   carefully_fclose(errfp, "bad-sector error log");
1228
1229 #undef f_bogus
1230 #undef f_continue
1231 #undef f_fixup
1232 #undef f_write
1233
1234   return (status);
1235 }