apps/metadata.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 Dave Chapman
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * as published by the Free Software Foundation; either version 2
  15  * of the License, or (at your option) any later version.
  16  *
  17  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  18  * KIND, either express or implied.
  19  *
  20  ****************************************************************************/
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <ctype.h>
  24 #include "string-extra.h"
  25
  26 #include "debug.h"
  27 #include "logf.h"
  28 #include "settings.h"
  29 #include "cuesheet.h"
  30 #include "metadata.h"
  31
  32 #include "metadata/metadata_parsers.h"
  33
  34 #if CONFIG_CODEC == SWCODEC
  35
  36 /* For trailing tag stripping and base audio data types */
  37 #include "buffering.h"
  38
  39 #include "metadata/metadata_common.h"
  40
  41 static bool get_shn_metadata(int fd, struct mp3entry *id3)
  42 {
  43     /* TODO: read the id3v2 header if it exists */
  44     id3->vbr = true;
  45     id3->filesize = filesize(fd);
  46     return skip_id3v2(fd, id3);
  47 }
  48
  49 static bool get_other_asap_metadata(int fd, struct mp3entry *id3)
  50 {
  51     id3->bitrate = 706;
  52     id3->frequency = 44100;
  53     id3->vbr = false;
  54     id3->filesize = filesize(fd);
  55     id3->genre_string = id3_get_num_genre(36);
  56     return true;
  57 }
  58 #endif /* CONFIG_CODEC == SWCODEC */
  59 bool write_metadata_log = false;
  60
  61 const struct afmt_entry audio_formats[AFMT_NUM_CODECS] =
  62 {
  63     /* Unknown file format */
  64     [AFMT_UNKNOWN] =
  65         AFMT_ENTRY("???", NULL,    NULL,        NULL, NULL  ),
  66
  67     /* MPEG Audio layer 2 */
  68     [AFMT_MPA_L2] =
  69         AFMT_ENTRY("MP2",   "mpa",  NULL,       get_mp3_metadata,   "mpa\0mp2\0"),
  70
  71 #if CONFIG_CODEC != SWCODEC
  72     /* MPEG Audio layer 3 on HWCODEC: .talk clips, no encoder  */
  73     [AFMT_MPA_L3] =
  74         AFMT_ENTRY("MP3",   "mpa",  NULL,       get_mp3_metadata,   "mp3\0talk\0"),
  75
  76 #else /* CONFIG_CODEC == SWCODEC */
  77     /* MPEG Audio layer 3 on SWCODEC */
  78     [AFMT_MPA_L3] =
  79         AFMT_ENTRY("MP3",   "mpa",  "mp3_enc",  get_mp3_metadata,   "mp3\0"),
  80
  81     /* MPEG Audio layer 1 */
  82     [AFMT_MPA_L1] =
  83         AFMT_ENTRY("MP1",   "mpa",  NULL,       get_mp3_metadata,   "mp1\0"),
  84     /* Audio Interchange File Format */
  85     [AFMT_AIFF] =
  86         AFMT_ENTRY("AIFF",  "aiff", "aiff_enc", get_aiff_metadata,  "aiff\0aif\0"),
  87     /* Uncompressed PCM in a WAV file OR ATRAC3 stream in WAV file (.at3) */
  88     [AFMT_PCM_WAV] =
  89         AFMT_ENTRY("WAV",   "wav",  "wav_enc",  get_wave_metadata,  "wav\0at3\0"),
  90     /* Ogg Vorbis */
  91     [AFMT_OGG_VORBIS] =
  92         AFMT_ENTRY("Ogg", "vorbis", NULL,       get_ogg_metadata,   "ogg\0oga\0"),
  93     /* FLAC */
  94     [AFMT_FLAC] =
  95         AFMT_ENTRY("FLAC",  "flac", NULL,       get_flac_metadata,  "flac\0"),
  96     /* Musepack SV7 */
  97     [AFMT_MPC_SV7] =
  98         AFMT_ENTRY("MPCv7", "mpc",  NULL,       get_musepack_metadata,"mpc\0"),
  99     /* A/52 (aka AC3) audio */
 100     [AFMT_A52] =
 101         AFMT_ENTRY("AC3",   "a52",  NULL,       get_a52_metadata,   "a52\0ac3\0"),
 102     /* WavPack */
 103     [AFMT_WAVPACK] =
 104         AFMT_ENTRY("WV","wavpack","wavpack_enc",get_wavpack_metadata,"wv\0"),
 105     /* Apple Lossless Audio Codec */
 106     [AFMT_MP4_ALAC] =
 107         AFMT_ENTRY("ALAC",  "alac", NULL,       get_mp4_metadata,   "m4a\0m4b\0"),
 108     /* Advanced Audio Coding in M4A container */
 109     [AFMT_MP4_AAC] =
 110         AFMT_ENTRY("AAC",   "aac",  NULL,       get_mp4_metadata,   "mp4\0"),
 111     /* Shorten */
 112     [AFMT_SHN] =
 113         AFMT_ENTRY("SHN","shorten", NULL,       get_shn_metadata,   "shn\0"),
 114     /* SID File Format */
 115     [AFMT_SID] =
 116         AFMT_ENTRY("SID",   "sid",  NULL,       get_sid_metadata,   "sid\0"),
 117     /* ADX File Format */
 118     [AFMT_ADX] =
 119         AFMT_ENTRY("ADX",   "adx",  NULL,       get_adx_metadata,   "adx\0"),
 120     /* NESM (NES Sound Format) */
 121     [AFMT_NSF] =
 122         AFMT_ENTRY("NSF",   "nsf",  NULL,       get_nsf_metadata,   "nsf\0nsfe\0"),
 123     /* Speex File Format */
 124     [AFMT_SPEEX] =
 125         AFMT_ENTRY("Speex", "speex",NULL,       get_ogg_metadata,   "spx\0"),
 126     /* SPC700 Save State */
 127     [AFMT_SPC] =
 128         AFMT_ENTRY("SPC",   "spc",  NULL,       get_spc_metadata,   "spc\0"),
 129     /* APE (Monkey's Audio) */
 130     [AFMT_APE] =
 131         AFMT_ENTRY("APE",   "ape",  NULL,       get_monkeys_metadata,"ape\0mac\0"),
 132     /* WMA (WMAV1/V2 in ASF) */
 133     [AFMT_WMA] =
 134         AFMT_ENTRY("WMA",   "wma",  NULL,       get_asf_metadata,"wma\0wmv\0asf\0"),
 135     /* WMA Professional in ASF */
 136     [AFMT_WMAPRO] =
 137         AFMT_ENTRY("WMAPro","wmapro",NULL,      NULL,            "wma\0wmv\0asf\0"),
 138     /* Amiga MOD File */
 139     [AFMT_MOD] =
 140         AFMT_ENTRY("MOD",   "mod",  NULL,       get_mod_metadata,   "mod\0"),
 141     /* Atari SAP File */
 142     [AFMT_SAP] =
 143         AFMT_ENTRY("SAP",   "asap", NULL,       get_asap_metadata,  "sap\0"),
 144     /* Cook in RM/RA */
 145     [AFMT_RM_COOK] =
 146         AFMT_ENTRY("Cook",  "cook", NULL,       get_rm_metadata,"rm\0ra\0rmvb\0"),
 147     /* AAC in RM/RA */
 148     [AFMT_RM_AAC] =
 149         AFMT_ENTRY("RAAC",  "raac", NULL,       NULL,           "rm\0ra\0rmvb\0"),
 150     /* AC3 in RM/RA */
 151     [AFMT_RM_AC3] =
 152         AFMT_ENTRY("AC3", "a52_rm", NULL,       NULL,           "rm\0ra\0rmvb\0"),
 153     /* ATRAC3 in RM/RA */
 154     [AFMT_RM_ATRAC3] =
 155         AFMT_ENTRY("ATRAC3","atrac3_rm",NULL,   NULL,           "rm\0ra\0rmvb\0"),
 156     /* Atari CMC File */
 157     [AFMT_CMC] =
 158         AFMT_ENTRY("CMC",   "asap", NULL,       get_other_asap_metadata,"cmc\0"),
 159     /* Atari CM3 File */
 160     [AFMT_CM3] =
 161         AFMT_ENTRY("CM3",   "asap", NULL,       get_other_asap_metadata,"cm3\0"),
 162     /* Atari CMR File */
 163     [AFMT_CMR] =
 164         AFMT_ENTRY("CMR",   "asap", NULL,       get_other_asap_metadata,"cmr\0"),
 165     /* Atari CMS File */
 166     [AFMT_CMS] =
 167         AFMT_ENTRY("CMS",   "asap", NULL,       get_other_asap_metadata,"cms\0"),
 168     /* Atari DMC File */
 169     [AFMT_DMC] =
 170         AFMT_ENTRY("DMC",   "asap", NULL,       get_other_asap_metadata,"dmc\0"),
 171     /* Atari DLT File */
 172     [AFMT_DLT] =
 173         AFMT_ENTRY("DLT",   "asap", NULL,       get_other_asap_metadata,"dlt\0"),
 174     /* Atari MPT File */
 175     [AFMT_MPT] =
 176         AFMT_ENTRY("MPT",   "asap", NULL,       get_other_asap_metadata,"mpt\0"),
 177     /* Atari MPD File */
 178     [AFMT_MPD] =
 179         AFMT_ENTRY("MPD",   "asap", NULL,       get_other_asap_metadata,"mpd\0"),
 180     /* Atari RMT File */
 181     [AFMT_RMT] =
 182         AFMT_ENTRY("RMT",   "asap", NULL,       get_other_asap_metadata,"rmt\0"),
 183     /* Atari TMC File */
 184     [AFMT_TMC] =
 185         AFMT_ENTRY("TMC",   "asap", NULL,       get_other_asap_metadata,"tmc\0"),
 186     /* Atari TM8 File */
 187     [AFMT_TM8] =
 188         AFMT_ENTRY("TM8",   "asap", NULL,       get_other_asap_metadata,"tm8\0"),
 189     /* Atari TM2 File */
 190     [AFMT_TM2] =
 191         AFMT_ENTRY("TM2",   "asap", NULL,       get_other_asap_metadata,"tm2\0"),
 192     /* Atrac3 in Sony OMA Container */
 193     [AFMT_OMA_ATRAC3] =
 194         AFMT_ENTRY("ATRAC3","atrac3_oma",NULL,  get_oma_metadata,   "oma\0aa3\0"),
 195     /* SMAF (Synthetic music Mobile Application Format) */
 196     [AFMT_SMAF] =
 197         AFMT_ENTRY("SMAF",  "smaf", NULL,       get_smaf_metadata,  "mmf\0"),
 198     /* Sun Audio file */
 199     [AFMT_AU] =
 200         AFMT_ENTRY("AU",    "au",   NULL,       get_au_metadata,    "au\0snd\0"),
 201     /* VOX (Dialogic telephony file formats) */
 202     [AFMT_VOX] =
 203         AFMT_ENTRY("VOX",   "vox",  NULL,       get_vox_metadata,   "vox\0"),
 204     /* Wave64 */
 205     [AFMT_WAVE64] =
 206         AFMT_ENTRY("WAVE64","wav64",NULL,       get_wave64_metadata,"w64\0"),
 207     /* True Audio */
 208     [AFMT_TTA] =
 209         AFMT_ENTRY("TTA",   "tta",  NULL,       get_tta_metadata,   "tta\0"),
 210     /* WMA Voice in ASF */
 211     [AFMT_WMAVOICE] =
 212         AFMT_ENTRY("WMAVoice","wmavoice",NULL,  NULL,               "wma\0wmv\0"),
 213     /* Musepack SV8 */
 214     [AFMT_MPC_SV8] =
 215         AFMT_ENTRY("MPCv8", "mpc",  NULL,       get_musepack_metadata,"mpc\0"),
 216     /* Advanced Audio Coding High Efficiency in M4A container */
 217     [AFMT_MP4_AAC_HE] =
 218         AFMT_ENTRY("AAC-HE","aac",  NULL,       get_mp4_metadata,   "mp4\0"),
 219 #endif
 220 };
 221
 222 #if CONFIG_CODEC == SWCODEC && defined (HAVE_RECORDING)
 223 /* get REC_FORMAT_* corresponding AFMT_* */
 224 const int rec_format_afmt[REC_NUM_FORMATS] =
 225 {
 226     /* give AFMT_UNKNOWN by default */
 227     [0 ... REC_NUM_FORMATS-1] = AFMT_UNKNOWN,
 228     /* add new entries below this line */
 229     [REC_FORMAT_AIFF]    = AFMT_AIFF,
 230     [REC_FORMAT_MPA_L3]  = AFMT_MPA_L3,
 231     [REC_FORMAT_WAVPACK] = AFMT_WAVPACK,
 232     [REC_FORMAT_PCM_WAV] = AFMT_PCM_WAV,
 233 };
 234
 235 /* get AFMT_* corresponding REC_FORMAT_* */
 236 const int afmt_rec_format[AFMT_NUM_CODECS] =
 237 {
 238     /* give -1 by default */
 239     [0 ... AFMT_NUM_CODECS-1] = -1,
 240     /* add new entries below this line */
 241     [AFMT_AIFF]    = REC_FORMAT_AIFF,
 242     [AFMT_MPA_L3]  = REC_FORMAT_MPA_L3,
 243     [AFMT_WAVPACK] = REC_FORMAT_WAVPACK,
 244     [AFMT_PCM_WAV] = REC_FORMAT_PCM_WAV,
 245 };
 246 #endif /* CONFIG_CODEC == SWCODEC && defined (HAVE_RECORDING) */
 247
 248 #if CONFIG_CODEC == SWCODEC
 249 /* Get the canonical AFMT type */
 250 int get_audio_base_codec_type(int type)
 251 {
 252     int base_type = type;
 253     switch (type) {
 254         case AFMT_MPA_L1:
 255         case AFMT_MPA_L2:
 256         case AFMT_MPA_L3:
 257             base_type = AFMT_MPA_L3;
 258             break;
 259         case AFMT_MPC_SV7:
 260         case AFMT_MPC_SV8:
 261             base_type = AFMT_MPC_SV7;
 262             break;
 263         case AFMT_MP4_AAC:
 264         case AFMT_MP4_AAC_HE:
 265             base_type = AFMT_MP4_AAC;
 266             break;
 267         case AFMT_SAP:
 268         case AFMT_CMC:
 269         case AFMT_CM3:
 270         case AFMT_CMR:
 271         case AFMT_CMS:
 272         case AFMT_DMC:
 273         case AFMT_DLT:
 274         case AFMT_MPT:
 275         case AFMT_MPD:
 276         case AFMT_RMT:
 277         case AFMT_TMC:
 278         case AFMT_TM8:
 279         case AFMT_TM2:
 280             base_type = AFMT_SAP;
 281             break;
 282         default:
 283             break;
 284     }
 285
 286     return base_type;
 287 }
 288
 289 /* Get the basic audio type */
 290 enum data_type get_audio_base_data_type(int afmt)
 291 {
 292     if ((unsigned)afmt >= AFMT_NUM_CODECS)
 293         return TYPE_UNKNOWN;
 294
 295     switch (get_audio_base_codec_type(afmt))
 296     {
 297     case AFMT_NSF:
 298     case AFMT_SPC:
 299     case AFMT_SID:
 300     case AFMT_MOD:
 301     case AFMT_SAP:
 302         /* Type must be allocated and loaded in its entirety onto
 303            the buffer */
 304         return TYPE_ATOMIC_AUDIO;
 305
 306     default:
 307         /* Assume type may be loaded and discarded incrementally */
 308         return TYPE_PACKET_AUDIO;
 309
 310     case AFMT_UNKNOWN:
 311         /* Have no idea at all */
 312         return TYPE_UNKNOWN;
 313     }
 314 }
 315
 316 /* Is the format allowed to buffer starting at some offset other than 0
 317    or first frame only for resume purposes? */
 318 bool format_buffers_with_offset(int afmt)
 319 {
 320     switch (afmt)
 321     {
 322     case AFMT_MPA_L1:
 323     case AFMT_MPA_L2:
 324     case AFMT_MPA_L3:
 325     case AFMT_WAVPACK:
 326         /* Format may be loaded at the first needed frame */
 327         return true;
 328     default:
 329         /* Format must be loaded from the beginning of the file
 330            (does not imply 'atomic', while 'atomic' implies 'no offset') */
 331         return false;
 332     }
 333 }
 334 #endif /* CONFIG_CODEC == SWCODEC */
 335
 336
 337 /* Simple file type probing by looking at the filename extension. */
 338 unsigned int probe_file_format(const char *filename)
 339 {
 340     char *suffix;
 341     unsigned int i;
 342
 343     suffix = strrchr(filename, '.');
 344
 345     if (suffix == NULL)
 346     {
 347         return AFMT_UNKNOWN;
 348     }
 349
 350     /* skip '.' */
 351     suffix++;
 352
 353     for (i = 1; i < AFMT_NUM_CODECS; i++)
 354     {
 355         /* search extension list for type */
 356         const char *ext = audio_formats[i].ext_list;
 357
 358         do
 359         {
 360             if (strcasecmp(suffix, ext) == 0)
 361             {
 362                 return i;
 363             }
 364
 365             ext += strlen(ext) + 1;
 366         }
 367         while (*ext != '\0');
 368     }
 369
 370     return AFMT_UNKNOWN;
 371 }
 372
 373 /* Note, that this returns false for successful, true for error! */
 374 bool mp3info(struct mp3entry *entry, const char *filename)
 375 {
 376     int fd;
 377     bool result;
 378
 379     fd = open(filename, O_RDONLY);
 380     if (fd < 0)
 381         return true;
 382
 383     result = !get_metadata(entry, fd, filename);
 384
 385     close(fd);
 386
 387     return result;
 388 }
 389
 390 /* Get metadata for track - return false if parsing showed problems with the
 391  * file that would prevent playback.
 392  */
 393 bool get_metadata(struct mp3entry* id3, int fd, const char* trackname)
 394 {
 395     const struct afmt_entry *entry;
 396     int logfd = 0;
 397     DEBUGF("Read metadata for %s\n", trackname);
 398     if (write_metadata_log)
 399     {
 400         logfd = open("/metadata.log", O_WRONLY | O_APPEND | O_CREAT, 0666);
 401         if (logfd >= 0)
 402         {
 403             write(logfd, trackname, strlen(trackname));
 404             write(logfd, "\n", 1);
 405             close(logfd);
 406         }
 407     }
 408
 409     /* Clear the mp3entry to avoid having bogus pointers appear */
 410     wipe_mp3entry(id3);
 411
 412     /* Take our best guess at the codec type based on file extension */
 413     id3->codectype = probe_file_format(trackname);
 414
 415     entry = &audio_formats[id3->codectype];
 416
 417     /* Load codec specific track tag information and confirm the codec type. */
 418     if (!entry->parse_func)
 419     {
 420         DEBUGF("nothing to parse for %s (format %s)", trackname, entry->label);
 421         return false;
 422     }
 423
 424     if (!entry->parse_func(fd, id3))
 425     {
 426         DEBUGF("parsing %s failed (format: %s)", trackname, entry->label);
 427         return false;
 428     }
 429
 430     lseek(fd, 0, SEEK_SET);
 431     strlcpy(id3->path, trackname, sizeof(id3->path));
 432     /* We have successfully read the metadata from the file */
 433     return true;
 434 }
 435
 436 #ifndef __PCTOOL__
 437 #if CONFIG_CODEC == SWCODEC
 438 void strip_tags(int handle_id)
 439 {
 440     static const unsigned char tag[] = "TAG";
 441     static const unsigned char apetag[] = "APETAGEX";
 442     size_t len, version;
 443     void *tail;
 444
 445     if (bufgettail(handle_id, 128, &tail) != 128)
 446         return;
 447
 448     if (memcmp(tail, tag, 3) == 0)
 449     {
 450         /* Skip id3v1 tag */
 451         logf("Cutting off ID3v1 tag");
 452         bufcuttail(handle_id, 128);
 453     }
 454
 455     /* Get a new tail, as the old one may have been cut */
 456     if (bufgettail(handle_id, 32, &tail) != 32)
 457         return;
 458
 459     /* Check for APE tag (look for the APE tag footer) */
 460     if (memcmp(tail, apetag, 8) != 0)
 461         return;
 462
 463     /* Read the version and length from the footer */
 464     version = get_long_le(&((unsigned char *)tail)[8]);
 465     len = get_long_le(&((unsigned char *)tail)[12]);
 466     if (version == 2000)
 467         len += 32; /* APEv2 has a 32 byte header */
 468
 469     /* Skip APE tag */
 470     logf("Cutting off APE tag (%ldB)", len);
 471     bufcuttail(handle_id, len);
 472 }
 473 #endif /* CONFIG_CODEC == SWCODEC */
 474 #endif /* ! __PCTOOL__ */
 475
 476 #define MOVE_ENTRY(x) if (x) x += offset;
 477
 478 void adjust_mp3entry(struct mp3entry *entry, void *dest, const void *orig)
 479 {
 480     long offset;
 481     if (orig > dest)
 482         offset = -((size_t)orig - (size_t)dest);
 483     else
 484         offset =  ((size_t)dest - (size_t)orig);
 485
 486     MOVE_ENTRY(entry->title)
 487     MOVE_ENTRY(entry->artist)
 488     MOVE_ENTRY(entry->album)
 489
 490     if (entry->genre_string > (char*)orig &&
 491         entry->genre_string < (char*)orig + sizeof(struct mp3entry))
 492         /* Don't adjust that if it points to an entry of the "genres" array */
 493         entry->genre_string += offset;
 494
 495     MOVE_ENTRY(entry->track_string)
 496     MOVE_ENTRY(entry->disc_string)
 497     MOVE_ENTRY(entry->year_string)
 498     MOVE_ENTRY(entry->composer)
 499     MOVE_ENTRY(entry->comment)
 500     MOVE_ENTRY(entry->albumartist)
 501     MOVE_ENTRY(entry->grouping)
 502     MOVE_ENTRY(entry->mb_track_id)
 503 }
 504
 505 void copy_mp3entry(struct mp3entry *dest, const struct mp3entry *orig)
 506 {
 507     memcpy(dest, orig, sizeof(struct mp3entry));
 508     adjust_mp3entry(dest, dest, orig);
 509 }
 510
 511 /* A shortcut to simplify the common task of clearing the struct */
 512 void wipe_mp3entry(struct mp3entry *id3)
 513 {
 514     memset(id3, 0, sizeof (struct mp3entry));
 515 }
 516
 517 #if CONFIG_CODEC == SWCODEC
 518 /* Glean what is possible from the filename alone - does not parse metadata */
 519 void fill_metadata_from_path(struct mp3entry *id3, const char *trackname)
 520 {
 521     char *p;
 522
 523     /* Clear the mp3entry to avoid having bogus pointers appear */
 524     wipe_mp3entry(id3);
 525
 526     /* Find the filename portion of the path */
 527     p = strrchr(trackname, '/');
 528     strlcpy(id3->id3v2buf, p ? ++p : id3->path, ID3V2_BUF_SIZE);
 529
 530     /* Get the format from the extension and trim it off */
 531     p = strrchr(id3->id3v2buf, '.');
 532     if (p)
 533     {
 534         /* Might be wrong for container formats - should we bother? */
 535         id3->codectype = probe_file_format(p);
 536
 537         if (id3->codectype != AFMT_UNKNOWN)
 538             *p = '\0';
 539     }
 540
 541     /* Set the filename as the title */
 542     id3->title = id3->id3v2buf;
 543
 544     /* Copy the path info */
 545     strlcpy(id3->path, trackname, sizeof (id3->path));
 546 }
 547 #endif /* CONFIG_CODEC == SWCODEC */
 548
 549 #ifndef __PCTOOL__
 550 #ifdef HAVE_TAGCACHE
 551 #if CONFIG_CODEC == SWCODEC
 552
 553 enum { AUTORESUMABLE_UNKNOWN = 0, AUTORESUMABLE_TRUE, AUTORESUMABLE_FALSE };
 554
 555 bool autoresumable(struct mp3entry *id3)
 556 {
 557     char *endp, *path;
 558     size_t len;
 559     bool is_resumable;
 560
 561     if (id3->autoresumable)             /* result cached? */
 562         return id3->autoresumable == AUTORESUMABLE_TRUE;
 563
 564     is_resumable = false;
 565
 566     if (id3->path)
 567     {
 568         for (path = global_settings.autoresume_paths;
 569              *path;                     /* search terms left? */
 570              path++)
 571         {
 572             if (*path == ':')           /* Skip empty search patterns */
 573                 continue;
 574
 575             /* FIXME: As soon as strcspn or strchrnul are made available in
 576                the core, the following can be made more efficient. */
 577             endp = strchr(path, ':');
 578             if (endp)
 579                 len = endp - path;
 580             else
 581                 len = strlen(path);
 582
 583             /* Note: At this point, len is always > 0 */
 584
 585             if (strncasecmp(id3->path, path, len) == 0)
 586             {
 587                 /* Full directory-name matches only.  Trailing '/' in
 588                    search path OK. */
 589                 if (id3->path[len] == '/' || id3->path[len - 1] == '/')
 590                 {
 591                     is_resumable = true;
 592                     break;
 593                 }
 594             }
 595             path += len - 1;
 596         }
 597     }
 598
 599     /* cache result */
 600     id3->autoresumable =
 601         is_resumable ? AUTORESUMABLE_TRUE : AUTORESUMABLE_FALSE;
 602
 603     logf("autoresumable: %s is%s resumable",
 604          id3->path, is_resumable ? "" : " not");
 605
 606     return is_resumable;
 607 }
 608
 609 #endif  /* SWCODEC */
 610 #endif  /* HAVE_TAGCACHE */
 611 #endif  /* __PCTOOL__ */