mdw@git.distorted.org.uk Git - dvdrip/blob - lib.c

   1 /* -*-c-*-
   2  *
   3  * Common functions for the DVDrip C utilities.
   4  *
   5  * (c) 2022 Mark Wooding
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of the DVD ripping toolset.
  11  *
  12  * DVDrip is free software: you can redistribute it and/or modify it
  13  * under the terms of the GNU General Public License as published by the
  14  * Free Software Foundation; either version 3 of the License, or (at your
  15  * option) any later version.
  16  *
  17  * DVDrip is distributed in the hope that it will be useful, but WITHOUT
  18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  19  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  20  * for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with DVDrip.  If not, see <https://www.gnu.org/licenses/>.
  24  */
  25
  26 /*----- Header files ------------------------------------------------------*/
  27
  28 #include "lib.h"
  29
  30 /*----- Diagnostics -------------------------------------------------------*/
  31
  32 const char *prog = "<unset>";
  33
  34 void set_prog(const char *p)
  35   { const char *q = strrchr(p, '/'); prog = q ? q + 1 : p; }
  36
  37 void vmoan(const char *fmt, va_list ap)
  38   { vmoan_syserr(0, fmt, ap); }
  39
  40 void vmoan_syserr(int err, const char *fmt, va_list ap)
  41 {
  42   fprintf(stderr, "%s: ", prog);
  43   vfprintf(stderr, fmt, ap);
  44   if (err) fprintf(stderr, ": %s", strerror(errno));
  45   fputc('\n', stderr);
  46 }
  47
  48 void moan(const char *fmt, ...)
  49   { va_list ap; va_start(ap, fmt); vmoan(fmt, ap); va_end(ap); }
  50
  51 void moan_syserr(int err, const char *fmt, ...)
  52   { va_list ap; va_start(ap, fmt); vmoan_syserr(err, fmt, ap); va_end(ap); }
  53
  54 void bail(const char *fmt, ...)
  55   { va_list ap; va_start(ap, fmt); vmoan(fmt, ap); va_end(ap); exit(2); }
  56
  57 void bail_syserr(int err, const char *fmt, ...)
  58 {
  59   va_list ap;
  60
  61   va_start(ap, fmt); vmoan_syserr(err, fmt, ap); va_end(ap);
  62   exit(2);
  63 }
  64
  65 /*----- Parsing utilities -------------------------------------------------*/
  66
  67 double parse_float(const char **p_inout, unsigned f,
  68                    double min, double max, const char *what)
  69 {
  70   const char *p;
  71   char *q;
  72   double x;
  73   int err;
  74
  75   err = errno; errno = 0;
  76   p = *p_inout;
  77   x = strtod(p, &q);
  78   if (errno || x < min || x > max || (!(f&PNF_JUNK) && *q))
  79     bail("bad %s `%s'", what, p);
  80   *p_inout = q; errno = err;
  81   return (x);
  82 }
  83
  84 long parse_int(const char **p_inout, unsigned f,
  85                long min, long max, const char *what)
  86 {
  87   const char *p;
  88   char *q;
  89   long x;
  90   int err;
  91
  92   err = errno; errno = 0;
  93   p = *p_inout;
  94   x = strtoul(p, &q, 0);
  95   if (errno || x < min || x > max || (!(f&PNF_JUNK) && *q))
  96     bail("bad %s `%s'", what, p);
  97   *p_inout = q; errno = err;
  98   return (x);
  99 }
 100
 101 /*----- Resizing buffers and arrays ---------------------------------------*/
 102
 103 void buf__grow(struct buf *b)
 104 {
 105   b->sz = b->sz ? 2*b->sz : 32;
 106   b->p = realloc(b->p, b->sz);
 107   if (!b->p) bail("out of memory allocating %zu bytes", b->sz);
 108 }
 109
 110 void *vec__grow(void *p, size_t esz, size_t *sz_inout)
 111 {
 112   size_t sz = *sz_inout, want;
 113
 114   sz = sz ? 2*sz : 32;
 115   want = sz*esz;
 116   p = realloc(p, want);
 117   if (!p) bail("out of memory allocating %zu bytes", want);
 118   *sz_inout = sz; return (p);
 119 }
 120
 121 /*----- System utilities --------------------------------------------------*/
 122
 123 void sit(double t)
 124 {
 125   struct timeval tv;
 126   double whole = floor(t);
 127
 128   if (t) {
 129     tv.tv_sec = whole; tv.tv_usec = floor((t - whole)*1.0e6) + 1;
 130     if (select(0, 0, 0, 0, &tv) < 0) bail_syserr(errno, "failed to sleep");
 131   }
 132 }
 133
 134 double tvdiff(const struct timeval *tv_lo, const struct timeval *tv_hi)
 135 {
 136   return ((tv_hi->tv_sec - tv_lo->tv_sec) +
 137           (tv_hi->tv_usec - tv_lo->tv_usec)/1.0e6);
 138 }
 139
 140 int read_line(FILE *fp, struct buf *b)
 141 {
 142   int ch;
 143
 144   ch = getc(fp);
 145   if (ch == EOF)
 146     return (-1);
 147   else if (ch != '\n')
 148     do { buf_putc(b, ch); ch = getc(fp); } while (ch != EOF && ch != '\n');
 149   buf_putz(b);
 150   return (0);
 151 }
 152
 153 void carefully_write(int fd, const void *buf, size_t sz)
 154 {
 155   const unsigned char *p = buf;
 156   ssize_t n;
 157
 158   if (fd < 0) return;
 159   while (sz) {
 160     n = write(fd, p, sz);
 161     if (n < 0) {
 162       if (errno == EINTR) continue;
 163       bail_syserr(errno, "failed to write to output file");
 164     }
 165     if (!n) bail("unexpected short write to output file");
 166     p += n; sz -= n;
 167   }
 168 }
 169
 170 void open_file_on_demand(const char *file, FILE **fp_inout, const char *what)
 171 {
 172   FILE *fp;
 173
 174   if (!*fp_inout) {
 175     fp = fopen(file, "w");
 176     if (!fp) bail_syserr(errno, "failed to open %s file `%s'", what, file);
 177     fprintf(fp, "## %s\n\n", what);
 178     *fp_inout = fp;
 179   }
 180 }
 181
 182 void check_write(FILE *fp, const char *what)
 183 {
 184   fflush(fp);
 185   if (ferror(fp)) bail_syserr(errno, "error writing %s file", what);
 186 }
 187
 188 void carefully_fclose(FILE *fp, const char *what)
 189 {
 190   if (fp && (ferror(fp) || fclose(fp)))
 191     bail_syserr(errno, "error writing %s file", what);
 192 }
 193
 194 off_t device_size(int fd, const char *file, int *blksz_out)
 195 {
 196   struct stat st;
 197   uint64_t volsz;
 198
 199   if (fstat(fd, &st))
 200     bail_syserr(errno, "failed to obtain status for `%s'", file);
 201   if (S_ISREG(st.st_mode))
 202     volsz = st.st_size;
 203   else if (S_ISBLK(st.st_mode)) {
 204     if (ioctl(fd, BLKGETSIZE64, &volsz))
 205       bail_syserr(errno, "failed to get volume size for `%s'", file);
 206     if (ioctl(fd, BLKSSZGET, blksz_out))
 207       bail_syserr(errno, "failed to get block size for `%s'", file);
 208   } else
 209     bail("can't read size for `%s': expected file or block device", file);
 210   return ((off_t)volsz);
 211 }
 212
 213 /*----- Progress utilities ------------------------------------------------*/
 214
 215 struct progress_state progress = PROGRESS_STATE_INIT;
 216 static struct banner_progress_item banner_progress;
 217
 218 static void render_banner_progress(struct progress_item *item,
 219                             struct progress_render_state *render)
 220 {
 221   struct banner_progress_item *bi = (struct banner_progress_item *)item;
 222
 223   progress_putleft(render, " %s", bi->msg);
 224   progress_shownotice(render, 4, 7);
 225 }
 226
 227 void show_banner(const char *msg)
 228 {
 229   banner_progress._base.render = render_banner_progress;
 230   progress_additem(&progress, &banner_progress._base);
 231   banner_progress.msg = msg;
 232   progress_update(&progress);
 233 }
 234
 235 void hide_banner(void)
 236 {
 237   if (!progress_removeitem(&progress, &banner_progress._base))
 238     progress_update(&progress);
 239 }
 240
 241 /*----- DVD utilities -----------------------------------------------------*/
 242
 243 #ifdef notdef
 244 static void logfn(void *p, dvd_logger_level_t lev,
 245                   const char *fmt, va_list ap)
 246 {
 247   switch (lev) {
 248     case DVD_LOGGER_LEVEL_ERROR:
 249       fprintf("%s (libdvdread error): ", prog);
 250       break;
 251     case DVD_LOGGER_LEVEL_WARN:
 252       fprintf("%s (libdvdread warning): ", prog);
 253       break;
 254     default:
 255       return;
 256   }
 257   vfprintf(stderr, fmt, ap);
 258   fputc('\n', stderr);
 259 }
 260 static const dvd_logger_cb logger = { logfn };
 261 #endif
 262
 263 void open_dvd(const char *device, int mode,
 264               int *fd_out, dvd_reader_t **dvd_out)
 265 {
 266   int fd;
 267   dvd_reader_t *dvd;
 268   int bannerp = 0;
 269
 270   for (;;) {
 271     fd = open(device, mode);
 272     if (fd >= 0 || errno != ENOMEDIUM) break;
 273     if (!bannerp) {
 274       show_banner("Waiting for disc to be inserted...");
 275       bannerp = 1;
 276     }
 277     sit(0.2);
 278   }
 279   if (bannerp) hide_banner();
 280   if (fd < 0) bail_syserr(errno, "failed to open device `%s'", device);
 281   if (dvd_out) {
 282 #ifdef notdef
 283     dvd = DVDOpen2(0, &logger, device);
 284 #else
 285     dvd = DVDOpen(device);
 286 #endif
 287     if (!dvd) bail("failed to open DVD on `%s'", device);
 288     *dvd_out = dvd;
 289   }
 290   if (fd_out) *fd_out = fd;
 291   else close(fd);
 292 }
 293
 294 void store_filename(char *buf, ident id)
 295 {
 296   switch (id_kind(id)) {
 297     case RAW:
 298       sprintf(buf, "#<raw device>");
 299       break;
 300     case IFO:
 301       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.IFO");
 302       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.IFO", id_title(id));
 303       break;
 304     case BUP:
 305       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.BUP");
 306       else sprintf(buf, "/VIDEO_TS/VTS_%02u_0.BUP", id_title(id));
 307       break;
 308     case VOB:
 309       if (!id_title(id)) sprintf(buf, "/VIDEO_TS/VIDEO_TS.VOB");
 310       else
 311         sprintf(buf, "/VIDEO_TS/VTS_%02u_%u.VOB", id_title(id), id_part(id));
 312       break;
 313     default:
 314       abort();
 315   }
 316 }
 317
 318 static char *copy_string(char *p, const char *q)
 319 {
 320   while (*q) *p++ = *q++;
 321   *p = 0; return (p);
 322 }
 323
 324 static char *copy_hex(char *p, const unsigned char *q, size_t sz)
 325 {
 326   while (sz) {
 327     sprintf(p, "%02x", *q);
 328     p += 2; q++; sz--;
 329   }
 330   return (p);
 331 }
 332
 333 int dvd_id(char *p, dvd_reader_t *dvd, unsigned f, const char *file)
 334 {
 335   char volid[33];
 336   unsigned char volsetid[16], discid[16];
 337   int rc;
 338   size_t n;
 339
 340   rc = DVDUDFVolumeInfo(dvd,
 341                         volid, sizeof(volid),
 342                         volsetid, sizeof(volsetid));
 343   if (!rc) {
 344     p = copy_string(p, volid);
 345     *p++ = '-';
 346     for (n = sizeof(volsetid); n && !volsetid[n - 1]; n--);
 347     p = copy_hex(p, volsetid, n);
 348   } else if (f&DIF_MUSTVOLINF) {
 349     if (file) moan("failed to read volume info for `%s'", file);
 350     else moan("failed to read volume info");
 351     return (-1);
 352   } else
 353     p = copy_string(p, "<error reading volume info>");
 354
 355   *p++ = ':';
 356   rc = DVDDiscID(dvd, discid);
 357   if (!rc)
 358     p = copy_hex(p, discid, sizeof(discid));
 359   else if (f&DIF_MUSTIFOHASH) {
 360     if (file) moan("failed to determine disc id of `%s'", file);
 361     else moan("failed to determine disc id");
 362     return (-1);
 363   } else
 364     p = copy_string(p, "<error reading disc-id>");
 365
 366   return (0);
 367 }
 368
 369 /*----- That's all, folks -------------------------------------------------*/