apps/tagcache.c

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2005 by Miika Pekkarinen
  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
  22 /*
  23  *                    TagCache API
  24  *
  25  *       ----------x---------x------------------x-----
  26  *                 |         |                  |              External
  27  * +---------------x-------+ |       TagCache   |              Libraries
  28  * | Modification routines | |         Core     |
  29  * +-x---------x-----------+ |                  |
  30  *   | (R/W)   |             |                  |           |
  31  *   |  +------x-------------x-+  +-------------x-----+     |
  32  *   |  |                      x==x Filters & clauses |     |
  33  *   |  | Search routines      |  +-------------------+     |
  34  *   |  |                      x============================x DirCache
  35  *   |  +-x--------------------+                            | (optional)
  36  *   |    | (R)                                             |
  37  *   |    | +-------------------------------+  +---------+  |
  38  *   |    | | DB Commit (sort,unique,index) |  |         |  |
  39  *   |    | +-x--------------------------x--+  | Control |  |
  40  *   |    |   | (R/W)                    | (R) | Thread  |  |
  41  *   |    |   | +----------------------+ |     |         |  |
  42  *   |    |   | | TagCache DB Builder  | |     +---------+  |
  43  *   |    |   | +-x-------------x------+ |                  |
  44  *   |    |   |   | (R)         | (W)    |                  |
  45  *   |    |   |   |          +--x--------x---------+        |
  46  *   |    |   |   |          | Temporary Commit DB |        |
  47  *   |    |   |   |          +---------------------+        |
  48  * +-x----x-------x--+                                      |
  49  * | TagCache RAM DB x==\(W) +-----------------+            |
  50  * +-----------------+   \===x                 |            |
  51  *   |    |   |   |      (R) |  Ram DB Loader  x============x DirCache
  52  * +-x----x---x---x---+   /==x                 |            | (optional)
  53  * | Tagcache Disk DB x==/   +-----------------+            |
  54  * +------------------+                                     |
  55  *
  56  */
  57
  58 /* #define LOGF_ENABLE */
  59
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <ctype.h>
  63 #include "config.h"
  64 #include "ata_idle_notify.h"
  65 #include "thread.h"
  66 #include "kernel.h"
  67 #include "system.h"
  68 #include "logf.h"
  69 #include "string.h"
  70 #include "usb.h"
  71 #include "metadata.h"
  72 #include "tagcache.h"
  73 #include "buffer.h"
  74 #include "crc32.h"
  75 #include "misc.h"
  76 #include "settings.h"
  77 #include "dir.h"
  78 #include "structec.h"
  79
  80 #ifndef __PCTOOL__
  81 #include "lang.h"
  82 #include "eeprom_settings.h"
  83 #endif
  84
  85 #ifdef __PCTOOL__
  86 #define yield() do { } while(0)
  87 #define sim_sleep(timeout) do { } while(0)
  88 #define do_timed_yield() do { } while(0)
  89 #endif
  90
  91 #ifndef __PCTOOL__
  92 /* Tag Cache thread. */
  93 static struct event_queue tagcache_queue;
  94 static long tagcache_stack[(DEFAULT_STACK_SIZE + 0x4000)/sizeof(long)];
  95 static const char tagcache_thread_name[] = "tagcache";
  96 #endif
  97
  98 #define UNTAGGED "<Untagged>"
  99
 100 /* Previous path when scanning directory tree recursively. */
 101 static char curpath[TAG_MAXLEN+32];
 102
 103 /* Used when removing duplicates. */
 104 static char *tempbuf;     /* Allocated when needed. */
 105 static long tempbufidx;   /* Current location in buffer. */
 106 static long tempbuf_size; /* Buffer size (TEMPBUF_SIZE). */
 107 static long tempbuf_left; /* Buffer space left. */
 108 static long tempbuf_pos;
 109
 110 #define SORTED_TAGS_COUNT 8
 111 #define TAGCACHE_IS_UNIQUE(tag) (BIT_N(tag) & TAGCACHE_UNIQUE_TAGS)
 112 #define TAGCACHE_IS_SORTED(tag) (BIT_N(tag) & TAGCACHE_SORTED_TAGS)
 113 #define TAGCACHE_IS_NUMERIC_OR_NONUNIQUE(tag) \
 114     (BIT_N(tag) & (TAGCACHE_NUMERIC_TAGS | ~TAGCACHE_UNIQUE_TAGS))
 115 /* Tags we want to get sorted (loaded to the tempbuf). */
 116 #define TAGCACHE_SORTED_TAGS ((1LU << tag_artist) | (1LU << tag_album) | \
 117     (1LU << tag_genre) | (1LU << tag_composer) | (1LU << tag_comment) | \
 118     (1LU << tag_albumartist) | (1LU << tag_grouping) | (1LU << tag_title))
 119
 120 /* Uniqued tags (we can use these tags with filters and conditional clauses). */
 121 #define TAGCACHE_UNIQUE_TAGS ((1LU << tag_artist) | (1LU << tag_album) | \
 122     (1LU << tag_genre) | (1LU << tag_composer) | (1LU << tag_comment) | \
 123     (1LU << tag_albumartist) | (1LU << tag_grouping))
 124
 125 /* String presentation of the tags defined in tagcache.h. Must be in correct order! */
 126 static const char *tags_str[] = { "artist", "album", "genre", "title",
 127     "filename", "composer", "comment", "albumartist", "grouping", "year",
 128     "discnumber", "tracknumber", "bitrate", "length", "playcount", "rating",
 129     "playtime", "lastplayed", "commitid", "mtime" };
 130
 131 /* Status information of the tagcache. */
 132 static struct tagcache_stat tc_stat;
 133
 134 /* Queue commands. */
 135 enum tagcache_queue {
 136     Q_STOP_SCAN = 0,
 137     Q_START_SCAN,
 138     Q_IMPORT_CHANGELOG,
 139     Q_UPDATE,
 140     Q_REBUILD,
 141
 142     /* Internal tagcache command queue. */
 143     CMD_UPDATE_MASTER_HEADER,
 144     CMD_UPDATE_NUMERIC,
 145 };
 146
 147 struct tagcache_command_entry {
 148     int32_t command;
 149     int32_t idx_id;
 150     int32_t tag;
 151     int32_t data;
 152 };
 153
 154 #ifndef __PCTOOL__
 155 static struct tagcache_command_entry command_queue[TAGCACHE_COMMAND_QUEUE_LENGTH];
 156 static volatile int command_queue_widx = 0;
 157 static volatile int command_queue_ridx = 0;
 158 static struct mutex command_queue_mutex;
 159 #endif
 160
 161 /* Tag database structures. */
 162
 163 /* Variable-length tag entry in tag files. */
 164 struct tagfile_entry {
 165     int32_t tag_length;  /* Length of the data in bytes including '\0' */
 166     int32_t idx_id;      /* Corresponding entry location in index file of not unique tags */
 167     char tag_data[0];  /* Begin of the tag data */
 168 };
 169
 170 /* Fixed-size tag entry in master db index. */
 171 struct index_entry {
 172     int32_t tag_seek[TAG_COUNT]; /* Location of tag data or numeric tag data */
 173     int32_t flag;                /* Status flags */
 174 };
 175
 176 /* Header is the same in every file. */
 177 struct tagcache_header {
 178     int32_t magic;       /* Header version number */
 179     int32_t datasize;    /* Data size in bytes */
 180     int32_t entry_count; /* Number of entries in this file */
 181 };
 182
 183 struct master_header {
 184     struct tagcache_header tch;
 185     int32_t serial; /* Increasing counting number */
 186     int32_t commitid; /* Number of commits so far */
 187     int32_t dirty;
 188 };
 189
 190 /* For the endianess correction */
 191 static const char *tagfile_entry_ec   = "ll";
 192 /**
 193  Note: This should be (1 + TAG_COUNT) amount of l's.
 194  */
 195 static const char *index_entry_ec     = "lllllllllllllllllllll";
 196
 197 static const char *tagcache_header_ec = "lll";
 198 static const char *master_header_ec   = "llllll";
 199
 200 static struct master_header current_tcmh;
 201
 202 #ifdef HAVE_TC_RAMCACHE
 203 /* Header is created when loading database to ram. */
 204 struct ramcache_header {
 205     struct master_header h;      /* Header from the master index */
 206     struct index_entry *indices; /* Master index file content */
 207     char *tags[TAG_COUNT];       /* Tag file content (not including filename tag) */
 208     int entry_count[TAG_COUNT];  /* Number of entries in the indices. */
 209 };
 210
 211 # ifdef HAVE_EEPROM_SETTINGS
 212 struct statefile_header {
 213     struct ramcache_header *hdr;
 214     struct tagcache_stat tc_stat;
 215 };
 216 # endif
 217
 218 /* Pointer to allocated ramcache_header */
 219 static struct ramcache_header *hdr;
 220 #endif
 221
 222 /**
 223  * Full tag entries stored in a temporary file waiting
 224  * for commit to the cache. */
 225 struct temp_file_entry {
 226     long tag_offset[TAG_COUNT];
 227     short tag_length[TAG_COUNT];
 228     long flag;
 229
 230     long data_length;
 231 };
 232
 233 struct tempbuf_id_list {
 234     long id;
 235     struct tempbuf_id_list *next;
 236 };
 237
 238 struct tempbuf_searchidx {
 239     long idx_id;
 240     char *str;
 241     int seek;
 242     struct tempbuf_id_list idlist;
 243 };
 244
 245 /* Lookup buffer for fixing messed up index while after sorting. */
 246 static long commit_entry_count;
 247 static long lookup_buffer_depth;
 248 static struct tempbuf_searchidx **lookup;
 249
 250 /* Used when building the temporary file. */
 251 static int cachefd = -1, filenametag_fd;
 252 static int total_entry_count = 0;
 253 static int data_size = 0;
 254 static int processed_dir_count;
 255
 256 /* Thread safe locking */
 257 static volatile int write_lock;
 258 static volatile int read_lock;
 259
 260 static bool delete_entry(long idx_id);
 261
 262 const char* tagcache_tag_to_str(int tag)
 263 {
 264     return tags_str[tag];
 265 }
 266
 267 #ifdef HAVE_DIRCACHE
 268 /**
 269  * Returns true if specified flag is still present, i.e., dircache
 270  * has not been reloaded.
 271  */
 272 static bool is_dircache_intact(void)
 273 {
 274     return dircache_get_appflag(DIRCACHE_APPFLAG_TAGCACHE);
 275 }
 276 #endif
 277
 278 static int open_tag_fd(struct tagcache_header *hdr, int tag, bool write)
 279 {
 280     int fd;
 281     char buf[MAX_PATH];
 282     int rc;
 283
 284     if (TAGCACHE_IS_NUMERIC(tag) || tag < 0 || tag >= TAG_COUNT)
 285         return -1;
 286
 287     snprintf(buf, sizeof buf, TAGCACHE_FILE_INDEX, tag);
 288
 289     fd = open(buf, write ? O_RDWR : O_RDONLY);
 290     if (fd < 0)
 291     {
 292         logf("tag file open failed: tag=%d write=%d file=%s", tag, write, buf);
 293         tc_stat.ready = false;
 294         return fd;
 295     }
 296
 297     /* Check the header. */
 298     rc = ecread(fd, hdr, 1, tagcache_header_ec, tc_stat.econ);
 299     if (hdr->magic != TAGCACHE_MAGIC || rc != sizeof(struct tagcache_header))
 300     {
 301         logf("header error");
 302         tc_stat.ready = false;
 303         close(fd);
 304         return -2;
 305     }
 306
 307     return fd;
 308 }
 309
 310 static int open_master_fd(struct master_header *hdr, bool write)
 311 {
 312     int fd;
 313     int rc;
 314
 315     fd = open(TAGCACHE_FILE_MASTER, write ? O_RDWR : O_RDONLY);
 316     if (fd < 0)
 317     {
 318         logf("master file open failed for R/W");
 319         tc_stat.ready = false;
 320         return fd;
 321     }
 322
 323     tc_stat.econ = false;
 324
 325     /* Check the header. */
 326     rc = read(fd, hdr, sizeof(struct master_header));
 327     if (hdr->tch.magic == TAGCACHE_MAGIC && rc == sizeof(struct master_header))
 328     {
 329         /* Success. */
 330         return fd;
 331     }
 332
 333     /* Trying to read again, this time with endianess correction enabled. */
 334     lseek(fd, 0, SEEK_SET);
 335
 336     rc = ecread(fd, hdr, 1, master_header_ec, true);
 337     if (hdr->tch.magic != TAGCACHE_MAGIC || rc != sizeof(struct master_header))
 338     {
 339         logf("header error");
 340         tc_stat.ready = false;
 341         close(fd);
 342         return -2;
 343     }
 344
 345     tc_stat.econ = true;
 346
 347     return fd;
 348 }
 349
 350 #ifndef __PCTOOL__
 351 static bool do_timed_yield(void)
 352 {
 353     /* Sorting can lock up for quite a while, so yield occasionally */
 354     static long wakeup_tick = 0;
 355     if (current_tick >= wakeup_tick)
 356     {
 357         wakeup_tick = current_tick + (HZ/4);
 358         yield();
 359         return true;
 360     }
 361     return false;
 362 }
 363 #endif
 364
 365 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
 366 static long find_entry_ram(const char *filename,
 367                            const struct dirent *dc)
 368 {
 369     static long last_pos = 0;
 370     int i;
 371
 372     /* Check if we tagcache is loaded into ram. */
 373     if (!tc_stat.ramcache)
 374         return -1;
 375
 376     if (dc == NULL)
 377         dc = dircache_get_entry_ptr(filename);
 378
 379     if (dc == NULL)
 380     {
 381         logf("tagcache: file not found.");
 382         return -1;
 383     }
 384
 385     try_again:
 386
 387     if (last_pos > 0)
 388         i = last_pos;
 389     else
 390         i = 0;
 391
 392     for (; i < hdr->h.tch.entry_count; i++)
 393     {
 394         if (hdr->indices[i].tag_seek[tag_filename] == (long)dc)
 395         {
 396             last_pos = MAX(0, i - 3);
 397             return i;
 398         }
 399
 400         do_timed_yield();
 401     }
 402
 403     if (last_pos > 0)
 404     {
 405         last_pos = 0;
 406         goto try_again;
 407     }
 408
 409     return -1;
 410 }
 411 #endif
 412
 413 static long find_entry_disk(const char *filename, bool localfd)
 414 {
 415     struct tagcache_header tch;
 416     static long last_pos = -1;
 417     long pos_history[POS_HISTORY_COUNT];
 418     long pos_history_idx = 0;
 419     bool found = false;
 420     struct tagfile_entry tfe;
 421     int fd;
 422     char buf[TAG_MAXLEN+32];
 423     int i;
 424     int pos = -1;
 425
 426     if (!tc_stat.ready)
 427         return -2;
 428
 429     fd = filenametag_fd;
 430     if (fd < 0 || localfd)
 431     {
 432         last_pos = -1;
 433         if ( (fd = open_tag_fd(&tch, tag_filename, false)) < 0)
 434             return -1;
 435     }
 436
 437     check_again:
 438
 439     if (last_pos > 0)
 440         lseek(fd, last_pos, SEEK_SET);
 441     else
 442         lseek(fd, sizeof(struct tagcache_header), SEEK_SET);
 443
 444     while (true)
 445     {
 446         pos = lseek(fd, 0, SEEK_CUR);
 447         for (i = pos_history_idx-1; i >= 0; i--)
 448             pos_history[i+1] = pos_history[i];
 449         pos_history[0] = pos;
 450
 451         if (ecread(fd, &tfe, 1, tagfile_entry_ec, tc_stat.econ)
 452             != sizeof(struct tagfile_entry))
 453         {
 454             break ;
 455         }
 456
 457         if (tfe.tag_length >= (long)sizeof(buf))
 458         {
 459             logf("too long tag #1");
 460             close(fd);
 461             if (!localfd)
 462                 filenametag_fd = -1;
 463             last_pos = -1;
 464             return -2;
 465         }
 466
 467         if (read(fd, buf, tfe.tag_length) != tfe.tag_length)
 468         {
 469             logf("read error #2");
 470             close(fd);
 471             if (!localfd)
 472                 filenametag_fd = -1;
 473             last_pos = -1;
 474             return -3;
 475         }
 476
 477         if (!strcasecmp(filename, buf))
 478         {
 479             last_pos = pos_history[pos_history_idx];
 480             found = true;
 481             break ;
 482         }
 483
 484         if (pos_history_idx < POS_HISTORY_COUNT - 1)
 485             pos_history_idx++;
 486     }
 487
 488     /* Not found? */
 489     if (!found)
 490     {
 491         if (last_pos > 0)
 492         {
 493             last_pos = -1;
 494             logf("seek again");
 495             goto check_again;
 496         }
 497
 498         if (fd != filenametag_fd || localfd)
 499             close(fd);
 500         return -4;
 501     }
 502
 503     if (fd != filenametag_fd || localfd)
 504         close(fd);
 505
 506     return tfe.idx_id;
 507 }
 508
 509 static int find_index(const char *filename)
 510 {
 511     long idx_id = -1;
 512
 513 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
 514     if (tc_stat.ramcache && is_dircache_intact())
 515         idx_id = find_entry_ram(filename, NULL);
 516 #endif
 517
 518     if (idx_id < 0)
 519         idx_id = find_entry_disk(filename, true);
 520
 521     return idx_id;
 522 }
 523
 524 bool tagcache_find_index(struct tagcache_search *tcs, const char *filename)
 525 {
 526     int idx_id;
 527
 528     if (!tc_stat.ready)
 529         return false;
 530
 531     idx_id = find_index(filename);
 532     if (idx_id < 0)
 533         return false;
 534
 535     if (!tagcache_search(tcs, tag_filename))
 536         return false;
 537
 538     tcs->entry_count = 0;
 539     tcs->idx_id = idx_id;
 540
 541     return true;
 542 }
 543
 544 static bool get_index(int masterfd, int idxid,
 545                       struct index_entry *idx, bool use_ram)
 546 {
 547     bool localfd = false;
 548
 549     if (idxid < 0)
 550     {
 551         logf("Incorrect idxid: %d", idxid);
 552         return false;
 553     }
 554
 555 #ifdef HAVE_TC_RAMCACHE
 556     if (tc_stat.ramcache && use_ram)
 557     {
 558         if (hdr->indices[idxid].flag & FLAG_DELETED)
 559             return false;
 560
 561 # ifdef HAVE_DIRCACHE
 562         if (!(hdr->indices[idxid].flag & FLAG_DIRCACHE)
 563             || is_dircache_intact())
 564 #endif
 565         {
 566             memcpy(idx, &hdr->indices[idxid], sizeof(struct index_entry));
 567             return true;
 568         }
 569     }
 570 #else
 571     (void)use_ram;
 572 #endif
 573
 574     if (masterfd < 0)
 575     {
 576         struct master_header tcmh;
 577
 578         localfd = true;
 579         masterfd = open_master_fd(&tcmh, false);
 580         if (masterfd < 0)
 581             return false;
 582     }
 583
 584     lseek(masterfd, idxid * sizeof(struct index_entry)
 585           + sizeof(struct master_header), SEEK_SET);
 586     if (ecread(masterfd, idx, 1, index_entry_ec, tc_stat.econ)
 587         != sizeof(struct index_entry))
 588     {
 589         logf("read error #3");
 590         if (localfd)
 591             close(masterfd);
 592
 593         return false;
 594     }
 595
 596     if (localfd)
 597         close(masterfd);
 598
 599     if (idx->flag & FLAG_DELETED)
 600         return false;
 601
 602     return true;
 603 }
 604
 605 #ifndef __PCTOOL__
 606
 607 static bool write_index(int masterfd, int idxid, struct index_entry *idx)
 608 {
 609     /* We need to exclude all memory only flags & tags when writing to disk. */
 610     if (idx->flag & FLAG_DIRCACHE)
 611     {
 612         logf("memory only flags!");
 613         return false;
 614     }
 615
 616 #ifdef HAVE_TC_RAMCACHE
 617     /* Only update numeric data. Writing the whole index to RAM by memcpy
 618      * destroys dircache pointers!
 619      */
 620     if (tc_stat.ramcache)
 621     {
 622         int tag;
 623         struct index_entry *idx_ram = &hdr->indices[idxid];
 624
 625         for (tag = 0; tag < TAG_COUNT; tag++)
 626         {
 627             if (TAGCACHE_IS_NUMERIC(tag))
 628             {
 629                 idx_ram->tag_seek[tag] = idx->tag_seek[tag];
 630             }
 631         }
 632
 633         /* Don't touch the dircache flag or attributes. */
 634         idx_ram->flag = (idx->flag & 0x0000ffff)
 635             | (idx_ram->flag & (0xffff0000 | FLAG_DIRCACHE));
 636     }
 637 #endif
 638
 639     lseek(masterfd, idxid * sizeof(struct index_entry)
 640           + sizeof(struct master_header), SEEK_SET);
 641     if (ecwrite(masterfd, idx, 1, index_entry_ec, tc_stat.econ)
 642         != sizeof(struct index_entry))
 643     {
 644         logf("write error #3");
 645         logf("idxid: %d", idxid);
 646         return false;
 647     }
 648
 649     return true;
 650 }
 651
 652 #endif /* !__PCTOOL__ */
 653
 654 static bool open_files(struct tagcache_search *tcs, int tag)
 655 {
 656     if (tcs->idxfd[tag] < 0)
 657     {
 658         char fn[MAX_PATH];
 659
 660         snprintf(fn, sizeof fn, TAGCACHE_FILE_INDEX, tag);
 661         tcs->idxfd[tag] = open(fn, O_RDONLY);
 662     }
 663
 664     if (tcs->idxfd[tag] < 0)
 665     {
 666         logf("File not open!");
 667         return false;
 668     }
 669
 670     return true;
 671 }
 672
 673 static bool retrieve(struct tagcache_search *tcs, struct index_entry *idx,
 674                      int tag, char *buf, long size)
 675 {
 676     struct tagfile_entry tfe;
 677     long seek;
 678
 679     *buf = '\0';
 680
 681     if (TAGCACHE_IS_NUMERIC(tag))
 682         return false;
 683
 684     seek = idx->tag_seek[tag];
 685     if (seek < 0)
 686     {
 687         logf("Retrieve failed");
 688         return false;
 689     }
 690
 691 #ifdef HAVE_TC_RAMCACHE
 692     if (tcs->ramsearch)
 693     {
 694         struct tagfile_entry *ep;
 695
 696 # ifdef HAVE_DIRCACHE
 697         if (tag == tag_filename && (idx->flag & FLAG_DIRCACHE)
 698             && is_dircache_intact())
 699         {
 700             dircache_copy_path((struct dirent *)seek,
 701                                buf, size);
 702             return true;
 703         }
 704         else
 705 # endif
 706         if (tag != tag_filename)
 707         {
 708             ep = (struct tagfile_entry *)&hdr->tags[tag][seek];
 709             strncpy(buf, ep->tag_data, size-1);
 710
 711             return true;
 712         }
 713     }
 714 #endif
 715
 716     if (!open_files(tcs, tag))
 717         return false;
 718
 719     lseek(tcs->idxfd[tag], seek, SEEK_SET);
 720     if (ecread(tcs->idxfd[tag], &tfe, 1, tagfile_entry_ec, tc_stat.econ)
 721         != sizeof(struct tagfile_entry))
 722     {
 723         logf("read error #5");
 724         return false;
 725     }
 726
 727     if (tfe.tag_length >= size)
 728     {
 729         logf("too small buffer");
 730         return false;
 731     }
 732
 733     if (read(tcs->idxfd[tag], buf, tfe.tag_length) !=
 734         tfe.tag_length)
 735     {
 736         logf("read error #6");
 737         return false;
 738     }
 739
 740     buf[tfe.tag_length] = '\0';
 741
 742     return true;
 743 }
 744
 745 static long check_virtual_tags(int tag, const struct index_entry *idx)
 746 {
 747     long data = 0;
 748
 749     switch (tag)
 750     {
 751         case tag_virt_length_sec:
 752             data = (idx->tag_seek[tag_length]/1000) % 60;
 753             break;
 754
 755         case tag_virt_length_min:
 756             data = (idx->tag_seek[tag_length]/1000) / 60;
 757             break;
 758
 759         case tag_virt_playtime_sec:
 760             data = (idx->tag_seek[tag_playtime]/1000) % 60;
 761             break;
 762
 763         case tag_virt_playtime_min:
 764             data = (idx->tag_seek[tag_playtime]/1000) / 60;
 765             break;
 766
 767         case tag_virt_autoscore:
 768             if (idx->tag_seek[tag_length] == 0
 769                 || idx->tag_seek[tag_playcount] == 0)
 770             {
 771                 data = 0;
 772             }
 773             else
 774             {
 775                 data = 100 * idx->tag_seek[tag_playtime]
 776                     / idx->tag_seek[tag_length]
 777                     / idx->tag_seek[tag_playcount];
 778             }
 779             break;
 780
 781         /* How many commits before the file has been added to the DB. */
 782         case tag_virt_entryage:
 783             data = current_tcmh.commitid - idx->tag_seek[tag_commitid] - 1;
 784             break;
 785
 786         default:
 787             data = idx->tag_seek[tag];
 788     }
 789
 790     return data;
 791 }
 792
 793 long tagcache_get_numeric(const struct tagcache_search *tcs, int tag)
 794 {
 795     struct index_entry idx;
 796
 797     if (!tc_stat.ready)
 798         return false;
 799
 800     if (!TAGCACHE_IS_NUMERIC(tag))
 801         return -1;
 802
 803     if (!get_index(tcs->masterfd, tcs->idx_id, &idx, true))
 804         return -2;
 805
 806     return check_virtual_tags(tag, &idx);
 807 }
 808
 809 inline static bool str_ends_with(const char *str1, const char *str2)
 810 {
 811     int str_len = strlen(str1);
 812     int clause_len = strlen(str2);
 813
 814     if (clause_len > str_len)
 815         return false;
 816
 817     return !strcasecmp(&str1[str_len - clause_len], str2);
 818 }
 819
 820 inline static bool str_oneof(const char *str, const char *list)
 821 {
 822     const char *sep;
 823     int l, len = strlen(str);
 824
 825     while (*list)
 826     {
 827         sep = strchr(list, '|');
 828         l = sep ? (long)sep - (long)list : (int)strlen(list);
 829         if ((l==len) && !strncasecmp(str, list, len))
 830             return true;
 831         list += sep ? l + 1 : l;
 832     }
 833
 834     return false;
 835 }
 836
 837 static bool check_against_clause(long numeric, const char *str,
 838                                  const struct tagcache_search_clause *clause)
 839 {
 840     if (clause->numeric)
 841     {
 842         switch (clause->type)
 843         {
 844             case clause_is:
 845                 return numeric == clause->numeric_data;
 846             case clause_is_not:
 847                 return numeric != clause->numeric_data;
 848             case clause_gt:
 849                 return numeric > clause->numeric_data;
 850             case clause_gteq:
 851                 return numeric >= clause->numeric_data;
 852             case clause_lt:
 853                 return numeric < clause->numeric_data;
 854             case clause_lteq:
 855                 return numeric <= clause->numeric_data;
 856             default:
 857                 logf("Incorrect numeric tag: %d", clause->type);
 858         }
 859     }
 860     else
 861     {
 862         switch (clause->type)
 863         {
 864             case clause_is:
 865                 return !strcasecmp(clause->str, str);
 866             case clause_is_not:
 867                 return strcasecmp(clause->str, str);
 868             case clause_gt:
 869                 return 0>strcasecmp(clause->str, str);
 870             case clause_gteq:
 871                 return 0>=strcasecmp(clause->str, str);
 872             case clause_lt:
 873                 return 0<strcasecmp(clause->str, str);
 874             case clause_lteq:
 875                 return 0<=strcasecmp(clause->str, str);
 876             case clause_contains:
 877                 return (strcasestr(str, clause->str) != NULL);
 878             case clause_not_contains:
 879                 return (strcasestr(str, clause->str) == NULL);
 880             case clause_begins_with:
 881                 return (strcasestr(str, clause->str) == str);
 882             case clause_not_begins_with:
 883                 return (strcasestr(str, clause->str) != str);
 884             case clause_ends_with:
 885                 return str_ends_with(str, clause->str);
 886             case clause_not_ends_with:
 887                 return !str_ends_with(str, clause->str);
 888             case clause_oneof:
 889                 return str_oneof(str, clause->str);
 890
 891             default:
 892                 logf("Incorrect tag: %d", clause->type);
 893         }
 894     }
 895
 896     return false;
 897 }
 898
 899 static bool check_clauses(struct tagcache_search *tcs,
 900                           struct index_entry *idx,
 901                           struct tagcache_search_clause **clause, int count)
 902 {
 903     int i;
 904
 905 #ifdef HAVE_TC_RAMCACHE
 906     if (tcs->ramsearch)
 907     {
 908         /* Go through all conditional clauses. */
 909         for (i = 0; i < count; i++)
 910         {
 911             struct tagfile_entry *tfe;
 912             int seek;
 913             char buf[256];
 914             char *str = NULL;
 915
 916             seek = check_virtual_tags(clause[i]->tag, idx);
 917
 918             if (!TAGCACHE_IS_NUMERIC(clause[i]->tag))
 919             {
 920                 if (clause[i]->tag == tag_filename)
 921                 {
 922                     retrieve(tcs, idx, tag_filename, buf, sizeof buf);
 923                     str = buf;
 924                 }
 925                 else
 926                 {
 927                     tfe = (struct tagfile_entry *)&hdr->tags[clause[i]->tag][seek];
 928                     str = tfe->tag_data;
 929                 }
 930             }
 931
 932             if (!check_against_clause(seek, str, clause[i]))
 933                 return false;
 934         }
 935     }
 936     else
 937 #endif
 938     {
 939         /* Check for conditions. */
 940         for (i = 0; i < count; i++)
 941         {
 942             struct tagfile_entry tfe;
 943             int seek;
 944             char str[256];
 945
 946             seek = check_virtual_tags(clause[i]->tag, idx);
 947
 948             memset(str, 0, sizeof str);
 949             if (!TAGCACHE_IS_NUMERIC(clause[i]->tag))
 950             {
 951                 int fd = tcs->idxfd[clause[i]->tag];
 952                 lseek(fd, seek, SEEK_SET);
 953                 ecread(fd, &tfe, 1, tagfile_entry_ec, tc_stat.econ);
 954                 if (tfe.tag_length >= (int)sizeof(str))
 955                 {
 956                     logf("Too long tag read!");
 957                     break ;
 958                 }
 959
 960                 read(fd, str, tfe.tag_length);
 961
 962                 /* Check if entry has been deleted. */
 963                 if (str[0] == '\0')
 964                     break;
 965             }
 966
 967             if (!check_against_clause(seek, str, clause[i]))
 968                 return false;
 969         }
 970     }
 971
 972     return true;
 973 }
 974
 975 bool tagcache_check_clauses(struct tagcache_search *tcs,
 976                             struct tagcache_search_clause **clause, int count)
 977 {
 978     struct index_entry idx;
 979
 980     if (count == 0)
 981         return true;
 982
 983     if (!get_index(tcs->masterfd, tcs->idx_id, &idx, true))
 984         return false;
 985
 986     return check_clauses(tcs, &idx, clause, count);
 987 }
 988
 989 static bool add_uniqbuf(struct tagcache_search *tcs, unsigned long id)
 990 {
 991     int i;
 992
 993     /* If uniq buffer is not defined we must return true for search to work. */
 994     if (tcs->unique_list == NULL || (!TAGCACHE_IS_UNIQUE(tcs->type)
 995         && !TAGCACHE_IS_NUMERIC(tcs->type)))
 996     {
 997         return true;
 998     }
 999
1000     for (i = 0; i < tcs->unique_list_count; i++)
1001     {
1002         /* Return false if entry is found. */
1003         if (tcs->unique_list[i] == id)
1004             return false;
1005     }
1006
1007     if (tcs->unique_list_count < tcs->unique_list_capacity)
1008     {
1009         tcs->unique_list[i] = id;
1010         tcs->unique_list_count++;
1011     }
1012
1013     return true;
1014 }
1015
1016 static bool build_lookup_list(struct tagcache_search *tcs)
1017 {
1018     struct index_entry entry;
1019     int i, j;
1020
1021     tcs->seek_list_count = 0;
1022
1023 #ifdef HAVE_TC_RAMCACHE
1024     if (tcs->ramsearch
1025 # ifdef HAVE_DIRCACHE
1026         && (tcs->type != tag_filename || is_dircache_intact())
1027 # endif
1028         )
1029     {
1030         for (i = tcs->seek_pos; i < hdr->h.tch.entry_count; i++)
1031         {
1032             struct tagcache_seeklist_entry *seeklist;
1033             struct index_entry *idx = &hdr->indices[i];
1034             if (tcs->seek_list_count == SEEK_LIST_SIZE)
1035                 break ;
1036
1037             /* Skip deleted files. */
1038             if (idx->flag & FLAG_DELETED)
1039                 continue;
1040
1041             /* Go through all filters.. */
1042             for (j = 0; j < tcs->filter_count; j++)
1043             {
1044                 if (idx->tag_seek[tcs->filter_tag[j]] != tcs->filter_seek[j])
1045                 {
1046                     break ;
1047                 }
1048             }
1049
1050             if (j < tcs->filter_count)
1051                 continue ;
1052
1053             /* Check for conditions. */
1054             if (!check_clauses(tcs, idx, tcs->clause, tcs->clause_count))
1055                 continue;
1056
1057             /* Add to the seek list if not already in uniq buffer. */
1058             if (!add_uniqbuf(tcs, idx->tag_seek[tcs->type]))
1059                 continue;
1060
1061             /* Lets add it. */
1062             seeklist = &tcs->seeklist[tcs->seek_list_count];
1063             seeklist->seek = idx->tag_seek[tcs->type];
1064             seeklist->flag = idx->flag;
1065             seeklist->idx_id = i;
1066             tcs->seek_list_count++;
1067         }
1068
1069         tcs->seek_pos = i;
1070
1071         return tcs->seek_list_count > 0;
1072     }
1073 #endif
1074
1075     if (tcs->masterfd < 0)
1076     {
1077         struct master_header tcmh;
1078         tcs->masterfd = open_master_fd(&tcmh, false);
1079     }
1080
1081     lseek(tcs->masterfd, tcs->seek_pos * sizeof(struct index_entry) +
1082             sizeof(struct master_header), SEEK_SET);
1083
1084     while (ecread(tcs->masterfd, &entry, 1, index_entry_ec, tc_stat.econ)
1085            == sizeof(struct index_entry))
1086     {
1087         struct tagcache_seeklist_entry *seeklist;
1088
1089         if (tcs->seek_list_count == SEEK_LIST_SIZE)
1090             break ;
1091
1092         i = tcs->seek_pos;
1093         tcs->seek_pos++;
1094
1095         /* Check if entry has been deleted. */
1096         if (entry.flag & FLAG_DELETED)
1097             continue;
1098
1099         /* Go through all filters.. */
1100         for (j = 0; j < tcs->filter_count; j++)
1101         {
1102             if (entry.tag_seek[tcs->filter_tag[j]] != tcs->filter_seek[j])
1103                 break ;
1104         }
1105
1106         if (j < tcs->filter_count)
1107             continue ;
1108
1109         /* Check for conditions. */
1110         if (!check_clauses(tcs, &entry, tcs->clause, tcs->clause_count))
1111             continue;
1112
1113         /* Add to the seek list if not already in uniq buffer. */
1114         if (!add_uniqbuf(tcs, entry.tag_seek[tcs->type]))
1115             continue;
1116
1117         /* Lets add it. */
1118         seeklist = &tcs->seeklist[tcs->seek_list_count];
1119         seeklist->seek = entry.tag_seek[tcs->type];
1120         seeklist->flag = entry.flag;
1121         seeklist->idx_id = i;
1122         tcs->seek_list_count++;
1123
1124         yield();
1125     }
1126
1127     return tcs->seek_list_count > 0;
1128 }
1129
1130
1131 static void remove_files(void)
1132 {
1133     int i;
1134     char buf[MAX_PATH];
1135
1136     tc_stat.ready = false;
1137     tc_stat.ramcache = false;
1138     tc_stat.econ = false;
1139     remove(TAGCACHE_FILE_MASTER);
1140     for (i = 0; i < TAG_COUNT; i++)
1141     {
1142         if (TAGCACHE_IS_NUMERIC(i))
1143             continue;
1144
1145         snprintf(buf, sizeof buf, TAGCACHE_FILE_INDEX, i);
1146         remove(buf);
1147     }
1148 }
1149
1150
1151 static bool check_all_headers(void)
1152 {
1153     struct master_header myhdr;
1154     struct tagcache_header tch;
1155     int tag;
1156     int fd;
1157
1158     if ( (fd = open_master_fd(&myhdr, false)) < 0)
1159         return false;
1160
1161     close(fd);
1162     if (myhdr.dirty)
1163     {
1164         logf("tagcache is dirty!");
1165         return false;
1166     }
1167
1168     memcpy(&current_tcmh, &myhdr, sizeof(struct master_header));
1169
1170     for (tag = 0; tag < TAG_COUNT; tag++)
1171     {
1172         if (TAGCACHE_IS_NUMERIC(tag))
1173             continue;
1174
1175         if ( (fd = open_tag_fd(&tch, tag, false)) < 0)
1176             return false;
1177
1178         close(fd);
1179     }
1180
1181     return true;
1182 }
1183
1184 bool tagcache_is_busy(void)
1185 {
1186     return read_lock || write_lock;
1187 }
1188
1189 bool tagcache_search(struct tagcache_search *tcs, int tag)
1190 {
1191     struct tagcache_header tag_hdr;
1192     struct master_header   master_hdr;
1193     int i;
1194
1195     while (read_lock)
1196         sleep(1);
1197
1198     memset(tcs, 0, sizeof(struct tagcache_search));
1199     if (tc_stat.commit_step > 0 || !tc_stat.ready)
1200         return false;
1201
1202     tcs->position = sizeof(struct tagcache_header);
1203     tcs->type = tag;
1204     tcs->seek_pos = 0;
1205     tcs->list_position = 0;
1206     tcs->seek_list_count = 0;
1207     tcs->filter_count = 0;
1208     tcs->masterfd = -1;
1209
1210     for (i = 0; i < TAG_COUNT; i++)
1211         tcs->idxfd[i] = -1;
1212
1213 #ifndef HAVE_TC_RAMCACHE
1214     tcs->ramsearch = false;
1215 #else
1216     tcs->ramsearch = tc_stat.ramcache;
1217     if (tcs->ramsearch)
1218     {
1219         tcs->entry_count = hdr->entry_count[tcs->type];
1220     }
1221     else
1222 #endif
1223     {
1224         /* Always open as R/W so we can pass tcs to functions that modify data also
1225          * without failing. */
1226         tcs->masterfd = open_master_fd(&master_hdr, true);
1227         if (tcs->masterfd < 0)
1228             return false;
1229
1230         if (!TAGCACHE_IS_NUMERIC(tcs->type))
1231         {
1232             tcs->idxfd[tcs->type] = open_tag_fd(&tag_hdr, tcs->type, false);
1233             if (tcs->idxfd[tcs->type] < 0)
1234                 return false;
1235
1236             tcs->entry_count = tag_hdr.entry_count;
1237         }
1238         else
1239         {
1240             tcs->entry_count = master_hdr.tch.entry_count;
1241         }
1242     }
1243
1244     tcs->valid = true;
1245     tcs->initialized = true;
1246     write_lock++;
1247
1248     return true;
1249 }
1250
1251 void tagcache_search_set_uniqbuf(struct tagcache_search *tcs,
1252                                  void *buffer, long length)
1253 {
1254     tcs->unique_list = (unsigned long *)buffer;
1255     tcs->unique_list_capacity = length / sizeof(*tcs->unique_list);
1256     tcs->unique_list_count = 0;
1257 }
1258
1259 bool tagcache_search_add_filter(struct tagcache_search *tcs,
1260                                 int tag, int seek)
1261 {
1262     if (tcs->filter_count == TAGCACHE_MAX_FILTERS)
1263         return false;
1264
1265     if (TAGCACHE_IS_NUMERIC_OR_NONUNIQUE(tag))
1266         return false;
1267
1268     tcs->filter_tag[tcs->filter_count] = tag;
1269     tcs->filter_seek[tcs->filter_count] = seek;
1270     tcs->filter_count++;
1271
1272     return true;
1273 }
1274
1275 bool tagcache_search_add_clause(struct tagcache_search *tcs,
1276                                 struct tagcache_search_clause *clause)
1277 {
1278     int i;
1279
1280     if (tcs->clause_count >= TAGCACHE_MAX_CLAUSES)
1281     {
1282         logf("Too many clauses");
1283         return false;
1284     }
1285
1286     /* Check if there is already a similar filter in present (filters are
1287      * much faster than clauses).
1288      */
1289     for (i = 0; i < tcs->filter_count; i++)
1290     {
1291         if (tcs->filter_tag[i] == clause->tag)
1292             return true;
1293     }
1294
1295     if (!TAGCACHE_IS_NUMERIC(clause->tag) && tcs->idxfd[clause->tag] < 0)
1296     {
1297         char buf[MAX_PATH];
1298
1299         snprintf(buf, sizeof buf, TAGCACHE_FILE_INDEX, clause->tag);
1300         tcs->idxfd[clause->tag] = open(buf, O_RDONLY);
1301     }
1302
1303     tcs->clause[tcs->clause_count] = clause;
1304     tcs->clause_count++;
1305
1306     return true;
1307 }
1308
1309 static bool get_next(struct tagcache_search *tcs)
1310 {
1311     static char buf[TAG_MAXLEN+32];
1312     struct tagfile_entry entry;
1313     long flag = 0;
1314
1315     if (!tcs->valid || !tc_stat.ready)
1316         return false;
1317
1318     if (tcs->idxfd[tcs->type] < 0 && !TAGCACHE_IS_NUMERIC(tcs->type)
1319 #ifdef HAVE_TC_RAMCACHE
1320         && !tcs->ramsearch
1321 #endif
1322         )
1323         return false;
1324
1325     /* Relative fetch. */
1326     if (tcs->filter_count > 0 || tcs->clause_count > 0
1327         || TAGCACHE_IS_NUMERIC(tcs->type)
1328 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
1329         /* We need to retrieve flag status for dircache. */
1330         || (tcs->ramsearch && tcs->type == tag_filename)
1331 #endif
1332         )
1333     {
1334         struct tagcache_seeklist_entry *seeklist;
1335
1336         /* Check for end of list. */
1337         if (tcs->list_position == tcs->seek_list_count)
1338         {
1339             tcs->list_position = 0;
1340
1341             /* Try to fetch more. */
1342             if (!build_lookup_list(tcs))
1343             {
1344                 tcs->valid = false;
1345                 return false;
1346             }
1347         }
1348
1349         seeklist = &tcs->seeklist[tcs->list_position];
1350         flag = seeklist->flag;
1351         tcs->position = seeklist->seek;
1352         tcs->idx_id = seeklist->idx_id;
1353         tcs->list_position++;
1354     }
1355     else
1356     {
1357         if (tcs->entry_count == 0)
1358         {
1359             tcs->valid = false;
1360             return false;
1361         }
1362
1363         tcs->entry_count--;
1364     }
1365
1366     tcs->result_seek = tcs->position;
1367
1368     if (TAGCACHE_IS_NUMERIC(tcs->type))
1369     {
1370         snprintf(buf, sizeof(buf), "%d", tcs->position);
1371         tcs->result = buf;
1372         tcs->result_len = strlen(buf) + 1;
1373         return true;
1374     }
1375
1376     /* Direct fetch. */
1377 #ifdef HAVE_TC_RAMCACHE
1378     if (tcs->ramsearch)
1379     {
1380
1381 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
1382         if (tcs->type == tag_filename && (flag & FLAG_DIRCACHE)
1383             && is_dircache_intact())
1384         {
1385             dircache_copy_path((struct dirent *)tcs->position,
1386                                buf, sizeof buf);
1387             tcs->result = buf;
1388             tcs->result_len = strlen(buf) + 1;
1389             tcs->ramresult = false;
1390
1391             return true;
1392         }
1393         else
1394 #endif
1395         if (tcs->type != tag_filename)
1396         {
1397             struct tagfile_entry *ep;
1398
1399             ep = (struct tagfile_entry *)&hdr->tags[tcs->type][tcs->position];
1400             tcs->result = ep->tag_data;
1401             tcs->result_len = strlen(tcs->result) + 1;
1402             tcs->idx_id = ep->idx_id;
1403             tcs->ramresult = true;
1404
1405             /* Increase position for the next run. This may get overwritten. */
1406             tcs->position += sizeof(struct tagfile_entry) + ep->tag_length;
1407
1408             return true;
1409         }
1410     }
1411 #endif
1412
1413     if (!open_files(tcs, tcs->type))
1414     {
1415         tcs->valid = false;
1416         return false;
1417     }
1418
1419     /* Seek stream to the correct position and continue to direct fetch. */
1420     lseek(tcs->idxfd[tcs->type], tcs->position, SEEK_SET);
1421
1422     if (ecread(tcs->idxfd[tcs->type], &entry, 1,
1423                tagfile_entry_ec, tc_stat.econ) != sizeof(struct tagfile_entry))
1424     {
1425         logf("read error #5");
1426         tcs->valid = false;
1427         return false;
1428     }
1429
1430     if (entry.tag_length > (long)sizeof(buf))
1431     {
1432         tcs->valid = false;
1433         logf("too long tag #2");
1434         logf("P:%X/%X", tcs->position, entry.tag_length);
1435         return false;
1436     }
1437
1438     if (read(tcs->idxfd[tcs->type], buf, entry.tag_length) != entry.tag_length)
1439     {
1440         tcs->valid = false;
1441         logf("read error #4");
1442         return false;
1443     }
1444
1445     /**
1446      Update the position for the next read (this may be overridden
1447      if filters or clauses are being used).
1448      */
1449     tcs->position += sizeof(struct tagfile_entry) + entry.tag_length;
1450     tcs->result = buf;
1451     tcs->result_len = strlen(tcs->result) + 1;
1452     tcs->idx_id = entry.idx_id;
1453     tcs->ramresult = false;
1454
1455     return true;
1456 }
1457
1458 bool tagcache_get_next(struct tagcache_search *tcs)
1459 {
1460     while (get_next(tcs))
1461     {
1462         if (tcs->result_len > 1)
1463             return true;
1464     }
1465
1466     return false;
1467 }
1468
1469 bool tagcache_retrieve(struct tagcache_search *tcs, int idxid,
1470                        int tag, char *buf, long size)
1471 {
1472     struct index_entry idx;
1473
1474     *buf = '\0';
1475     if (!get_index(tcs->masterfd, idxid, &idx, true))
1476         return false;
1477
1478     return retrieve(tcs, &idx, tag, buf, size);
1479 }
1480
1481 static bool update_master_header(void)
1482 {
1483     struct master_header myhdr;
1484     int fd;
1485
1486     if (!tc_stat.ready)
1487         return false;
1488
1489     if ( (fd = open_master_fd(&myhdr, true)) < 0)
1490         return false;
1491
1492     myhdr.serial = current_tcmh.serial;
1493     myhdr.commitid = current_tcmh.commitid;
1494     myhdr.dirty = current_tcmh.dirty;
1495
1496     /* Write it back */
1497     lseek(fd, 0, SEEK_SET);
1498     ecwrite(fd, &myhdr, 1, master_header_ec, tc_stat.econ);
1499     close(fd);
1500
1501 #ifdef HAVE_TC_RAMCACHE
1502     if (hdr)
1503     {
1504         hdr->h.serial = current_tcmh.serial;
1505         hdr->h.commitid = current_tcmh.commitid;
1506         hdr->h.dirty = current_tcmh.dirty;
1507     }
1508 #endif
1509
1510     return true;
1511 }
1512
1513 #if 0
1514
1515 void tagcache_modify(struct tagcache_search *tcs, int type, const char *text)
1516 {
1517     struct tagentry *entry;
1518
1519     if (tcs->type != tag_title)
1520         return ;
1521
1522     /* We will need reserve buffer for this. */
1523     if (tcs->ramcache)
1524     {
1525         struct tagfile_entry *ep;
1526
1527         ep = (struct tagfile_entry *)&hdr->tags[tcs->type][tcs->result_seek];
1528         tcs->seek_list[tcs->seek_list_count];
1529     }
1530
1531     entry = find_entry_ram();
1532
1533 }
1534 #endif
1535
1536 void tagcache_search_finish(struct tagcache_search *tcs)
1537 {
1538     int i;
1539
1540     if (!tcs->initialized)
1541         return;
1542
1543     if (tcs->masterfd >= 0)
1544     {
1545         close(tcs->masterfd);
1546         tcs->masterfd = -1;
1547     }
1548
1549     for (i = 0; i < TAG_COUNT; i++)
1550     {
1551         if (tcs->idxfd[i] >= 0)
1552         {
1553             close(tcs->idxfd[i]);
1554             tcs->idxfd[i] = -1;
1555         }
1556     }
1557
1558     tcs->ramsearch = false;
1559     tcs->valid = false;
1560     tcs->initialized = 0;
1561     if (write_lock > 0)
1562         write_lock--;
1563 }
1564
1565 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
1566 static struct tagfile_entry *get_tag(const struct index_entry *entry, int tag)
1567 {
1568     return (struct tagfile_entry *)&hdr->tags[tag][entry->tag_seek[tag]];
1569 }
1570
1571 static long get_tag_numeric(const struct index_entry *entry, int tag)
1572 {
1573     return check_virtual_tags(tag, entry);
1574 }
1575
1576 static char* get_tag_string(const struct index_entry *entry, int tag)
1577 {
1578     char* s = get_tag(entry, tag)->tag_data;
1579     return strcmp(s, UNTAGGED) ? s : NULL;
1580 }
1581
1582 bool tagcache_fill_tags(struct mp3entry *id3, const char *filename)
1583 {
1584     struct index_entry *entry;
1585     int idx_id;
1586
1587     if (!tc_stat.ready || !tc_stat.ramcache)
1588         return false;
1589
1590     /* Find the corresponding entry in tagcache. */
1591     idx_id = find_entry_ram(filename, NULL);
1592     if (idx_id < 0)
1593         return false;
1594
1595     entry = &hdr->indices[idx_id];
1596
1597     id3->title        = get_tag_string(entry, tag_title);
1598     id3->artist       = get_tag_string(entry, tag_artist);
1599     id3->album        = get_tag_string(entry, tag_album);
1600     id3->genre_string = get_tag_string(entry, tag_genre);
1601     id3->composer     = get_tag_string(entry, tag_composer);
1602     id3->comment      = get_tag_string(entry, tag_comment);
1603     id3->albumartist  = get_tag_string(entry, tag_albumartist);
1604     id3->grouping     = get_tag_string(entry, tag_grouping);
1605
1606     id3->playcount  = get_tag_numeric(entry, tag_playcount);
1607     id3->rating     = get_tag_numeric(entry, tag_rating);
1608     id3->lastplayed = get_tag_numeric(entry, tag_lastplayed);
1609     id3->score      = get_tag_numeric(entry, tag_virt_autoscore) / 10;
1610     id3->year       = get_tag_numeric(entry, tag_year);
1611
1612     id3->discnum = get_tag_numeric(entry, tag_discnumber);
1613     id3->tracknum = get_tag_numeric(entry, tag_tracknumber);
1614     id3->bitrate = get_tag_numeric(entry, tag_bitrate);
1615     if (id3->bitrate == 0)
1616         id3->bitrate = 1;
1617
1618     return true;
1619 }
1620 #endif
1621
1622 static inline void write_item(const char *item)
1623 {
1624     int len = strlen(item) + 1;
1625
1626     data_size += len;
1627     write(cachefd, item, len);
1628 }
1629
1630 static int check_if_empty(char **tag)
1631 {
1632     int length;
1633
1634     if (*tag == NULL || **tag == '\0')
1635     {
1636         *tag = UNTAGGED;
1637         return sizeof(UNTAGGED); /* Tag length */
1638     }
1639
1640     length = strlen(*tag);
1641     if (length > TAG_MAXLEN)
1642     {
1643         logf("over length tag: %s", *tag);
1644         length = TAG_MAXLEN;
1645         (*tag)[length] = '\0';
1646     }
1647
1648     return length + 1;
1649 }
1650
1651 #define ADD_TAG(entry,tag,data) \
1652     /* Adding tag */ \
1653     entry.tag_offset[tag] = offset; \
1654     entry.tag_length[tag] = check_if_empty(data); \
1655     offset += entry.tag_length[tag]
1656
1657 static void add_tagcache(char *path, unsigned long mtime
1658 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
1659                          ,const struct dirent *dc
1660 #endif
1661                          )
1662 {
1663     struct mp3entry id3;
1664     struct temp_file_entry entry;
1665     bool ret;
1666     int fd;
1667     int idx_id = -1;
1668     char tracknumfix[3];
1669     int offset = 0;
1670     int path_length = strlen(path);
1671     bool has_albumartist;
1672     bool has_grouping;
1673
1674     if (cachefd < 0)
1675         return ;
1676
1677     /* Check for overlength file path. */
1678     if (path_length > TAG_MAXLEN)
1679     {
1680         /* Path can't be shortened. */
1681         logf("Too long path: %s", path);
1682         return ;
1683     }
1684
1685     /* Check if the file is supported. */
1686     if (probe_file_format(path) == AFMT_UNKNOWN)
1687         return ;
1688
1689     /* Check if the file is already cached. */
1690 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
1691     if (tc_stat.ramcache && is_dircache_intact())
1692     {
1693         idx_id = find_entry_ram(path, dc);
1694     }
1695 #endif
1696
1697     /* Be sure the entry doesn't exist. */
1698     if (filenametag_fd >= 0 && idx_id < 0)
1699         idx_id = find_entry_disk(path, false);
1700
1701     /* Check if file has been modified. */
1702     if (idx_id >= 0)
1703     {
1704         struct index_entry idx;
1705
1706         /* TODO: Mark that the index exists (for fast reverse scan) */
1707         //found_idx[idx_id/8] |= idx_id%8;
1708
1709         if (!get_index(-1, idx_id, &idx, true))
1710         {
1711             logf("failed to retrieve index entry");
1712             return ;
1713         }
1714
1715         if ((unsigned long)idx.tag_seek[tag_mtime] == mtime)
1716         {
1717             /* No changes to file. */
1718             return ;
1719         }
1720
1721         /* Metadata might have been changed. Delete the entry. */
1722         logf("Re-adding: %s", path);
1723         if (!delete_entry(idx_id))
1724         {
1725             logf("delete_entry failed: %d", idx_id);
1726             return ;
1727         }
1728     }
1729
1730     fd = open(path, O_RDONLY);
1731     if (fd < 0)
1732     {
1733         logf("open fail: %s", path);
1734         return ;
1735     }
1736
1737     memset(&id3, 0, sizeof(struct mp3entry));
1738     memset(&entry, 0, sizeof(struct temp_file_entry));
1739     memset(&tracknumfix, 0, sizeof(tracknumfix));
1740     ret = get_metadata(&id3, fd, path);
1741     close(fd);
1742
1743     if (!ret)
1744         return ;
1745
1746     logf("-> %s", path);
1747
1748     /* Generate track number if missing. */
1749     if (id3.tracknum <= 0)
1750     {
1751         const char *p = strrchr(path, '.');
1752
1753         if (p == NULL)
1754             p = &path[strlen(path)-1];
1755
1756         while (*p != '/')
1757         {
1758             if (isdigit(*p) && isdigit(*(p-1)))
1759             {
1760                 tracknumfix[1] = *p--;
1761                 tracknumfix[0] = *p;
1762                 break;
1763             }
1764             p--;
1765         }
1766
1767         if (tracknumfix[0] != '\0')
1768         {
1769             id3.tracknum = atoi(tracknumfix);
1770             /* Set a flag to indicate track number has been generated. */
1771             entry.flag |= FLAG_TRKNUMGEN;
1772         }
1773         else
1774         {
1775             /* Unable to generate track number. */
1776             id3.tracknum = -1;
1777         }
1778     }
1779
1780     /* Numeric tags */
1781     entry.tag_offset[tag_year] = id3.year;
1782     entry.tag_offset[tag_discnumber] = id3.discnum;
1783     entry.tag_offset[tag_tracknumber] = id3.tracknum;
1784     entry.tag_offset[tag_length] = id3.length;
1785     entry.tag_offset[tag_bitrate] = id3.bitrate;
1786     entry.tag_offset[tag_mtime] = mtime;
1787
1788     /* String tags. */
1789     has_albumartist = id3.albumartist != NULL
1790         && strlen(id3.albumartist) > 0;
1791     has_grouping = id3.grouping != NULL
1792         && strlen(id3.grouping) > 0;
1793
1794     ADD_TAG(entry, tag_filename, &path);
1795     ADD_TAG(entry, tag_title, &id3.title);
1796     ADD_TAG(entry, tag_artist, &id3.artist);
1797     ADD_TAG(entry, tag_album, &id3.album);
1798     ADD_TAG(entry, tag_genre, &id3.genre_string);
1799     ADD_TAG(entry, tag_composer, &id3.composer);
1800     ADD_TAG(entry, tag_comment, &id3.comment);
1801     if (has_albumartist)
1802     {
1803         ADD_TAG(entry, tag_albumartist, &id3.albumartist);
1804     }
1805     else
1806     {
1807         ADD_TAG(entry, tag_albumartist, &id3.artist);
1808     }
1809     if (has_grouping)
1810     {
1811         ADD_TAG(entry, tag_grouping, &id3.grouping);
1812     }
1813     else
1814     {
1815         ADD_TAG(entry, tag_grouping, &id3.title);
1816     }
1817     entry.data_length = offset;
1818
1819     /* Write the header */
1820     write(cachefd, &entry, sizeof(struct temp_file_entry));
1821
1822     /* And tags also... Correct order is critical */
1823     write_item(path);
1824     write_item(id3.title);
1825     write_item(id3.artist);
1826     write_item(id3.album);
1827     write_item(id3.genre_string);
1828     write_item(id3.composer);
1829     write_item(id3.comment);
1830     if (has_albumartist)
1831     {
1832         write_item(id3.albumartist);
1833     }
1834     else
1835     {
1836         write_item(id3.artist);
1837     }
1838     if (has_grouping)
1839     {
1840         write_item(id3.grouping);
1841     }
1842     else
1843     {
1844         write_item(id3.title);
1845     }
1846     total_entry_count++;
1847 }
1848
1849 static bool tempbuf_insert(char *str, int id, int idx_id, bool unique)
1850 {
1851     struct tempbuf_searchidx *index = (struct tempbuf_searchidx *)tempbuf;
1852     int len = strlen(str)+1;
1853     int i;
1854     unsigned crc32;
1855     unsigned *crcbuf = (unsigned *)&tempbuf[tempbuf_size-4];
1856     char buf[TAG_MAXLEN+32];
1857
1858     for (i = 0; str[i] != '\0' && i < (int)sizeof(buf)-1; i++)
1859         buf[i] = tolower(str[i]);
1860     buf[i] = '\0';
1861
1862     crc32 = crc_32(buf, i, 0xffffffff);
1863
1864     if (unique)
1865     {
1866         /* Check if the crc does not exist -> entry does not exist for sure. */
1867         for (i = 0; i < tempbufidx; i++)
1868         {
1869             if (crcbuf[-i] != crc32)
1870                 continue;
1871
1872             if (!strcasecmp(str, index[i].str))
1873             {
1874                 if (id < 0 || id >= lookup_buffer_depth)
1875                 {
1876                     logf("lookup buf overf.: %d", id);
1877                     return false;
1878                 }
1879
1880                 lookup[id] = &index[i];
1881                 return true;
1882             }
1883         }
1884     }
1885
1886     /* Insert to CRC buffer. */
1887     crcbuf[-tempbufidx] = crc32;
1888     tempbuf_left -= 4;
1889
1890     /* Insert it to the buffer. */
1891     tempbuf_left -= len;
1892     if (tempbuf_left - 4 < 0 || tempbufidx >= commit_entry_count-1)
1893         return false;
1894
1895     if (id >= lookup_buffer_depth)
1896     {
1897         logf("lookup buf overf. #2: %d", id);
1898         return false;
1899     }
1900
1901     if (id >= 0)
1902     {
1903         lookup[id] = &index[tempbufidx];
1904         index[tempbufidx].idlist.id = id;
1905     }
1906     else
1907         index[tempbufidx].idlist.id = -1;
1908
1909     index[tempbufidx].idlist.next = NULL;
1910     index[tempbufidx].idx_id = idx_id;
1911     index[tempbufidx].seek = -1;
1912     index[tempbufidx].str = &tempbuf[tempbuf_pos];
1913     memcpy(index[tempbufidx].str, str, len);
1914     tempbuf_pos += len;
1915     tempbufidx++;
1916
1917     return true;
1918 }
1919
1920 static int compare(const void *p1, const void *p2)
1921 {
1922     do_timed_yield();
1923
1924     struct tempbuf_searchidx *e1 = (struct tempbuf_searchidx *)p1;
1925     struct tempbuf_searchidx *e2 = (struct tempbuf_searchidx *)p2;
1926
1927     if (strcmp(e1->str, UNTAGGED) == 0)
1928     {
1929         if (strcmp(e2->str, UNTAGGED) == 0)
1930             return 0;
1931         return -1;
1932     }
1933     else if (strcmp(e2->str, UNTAGGED) == 0)
1934         return 1;
1935
1936     return strncasecmp(e1->str, e2->str, TAG_MAXLEN);
1937 }
1938
1939 static int tempbuf_sort(int fd)
1940 {
1941     struct tempbuf_searchidx *index = (struct tempbuf_searchidx *)tempbuf;
1942     struct tagfile_entry fe;
1943     int i;
1944     int length;
1945
1946     /* Generate reverse lookup entries. */
1947     for (i = 0; i < lookup_buffer_depth; i++)
1948     {
1949         struct tempbuf_id_list *idlist;
1950
1951         if (!lookup[i])
1952             continue;
1953
1954         if (lookup[i]->idlist.id == i)
1955             continue;
1956
1957         idlist = &lookup[i]->idlist;
1958         while (idlist->next != NULL)
1959             idlist = idlist->next;
1960
1961         tempbuf_left -= sizeof(struct tempbuf_id_list);
1962         if (tempbuf_left - 4 < 0)
1963             return -1;
1964
1965         idlist->next = (struct tempbuf_id_list *)&tempbuf[tempbuf_pos];
1966         if (tempbuf_pos & 0x03)
1967         {
1968             tempbuf_pos = (tempbuf_pos & ~0x03) + 0x04;
1969             tempbuf_left -= 3;
1970             idlist->next = (struct tempbuf_id_list *)&tempbuf[tempbuf_pos];
1971         }
1972         tempbuf_pos += sizeof(struct tempbuf_id_list);
1973
1974         idlist = idlist->next;
1975         idlist->id = i;
1976         idlist->next = NULL;
1977
1978         do_timed_yield();
1979     }
1980
1981     qsort(index, tempbufidx, sizeof(struct tempbuf_searchidx), compare);
1982     memset(lookup, 0, lookup_buffer_depth * sizeof(struct tempbuf_searchidx **));
1983
1984     for (i = 0; i < tempbufidx; i++)
1985     {
1986         struct tempbuf_id_list *idlist = &index[i].idlist;
1987
1988         /* Fix the lookup list. */
1989         while (idlist != NULL)
1990         {
1991             if (idlist->id >= 0)
1992                 lookup[idlist->id] = &index[i];
1993             idlist = idlist->next;
1994         }
1995
1996         index[i].seek = lseek(fd, 0, SEEK_CUR);
1997         length = strlen(index[i].str) + 1;
1998         fe.tag_length = length;
1999         fe.idx_id = index[i].idx_id;
2000
2001         /* Check the chunk alignment. */
2002         if ((fe.tag_length + sizeof(struct tagfile_entry))
2003             % TAGFILE_ENTRY_CHUNK_LENGTH)
2004         {
2005             fe.tag_length += TAGFILE_ENTRY_CHUNK_LENGTH -
2006                 ((fe.tag_length + sizeof(struct tagfile_entry))
2007                  % TAGFILE_ENTRY_CHUNK_LENGTH);
2008         }
2009
2010 #ifdef TAGCACHE_STRICT_ALIGN
2011         /* Make sure the entry is long aligned. */
2012         if (index[i].seek & 0x03)
2013         {
2014             logf("tempbuf_sort: alignment error!");
2015             return -3;
2016         }
2017 #endif
2018
2019         if (ecwrite(fd, &fe, 1, tagfile_entry_ec, tc_stat.econ) !=
2020             sizeof(struct tagfile_entry))
2021         {
2022             logf("tempbuf_sort: write error #1");
2023             return -1;
2024         }
2025
2026         if (write(fd, index[i].str, length) != length)
2027         {
2028             logf("tempbuf_sort: write error #2");
2029             return -2;
2030         }
2031
2032         /* Write some padding. */
2033         if (fe.tag_length - length > 0)
2034             write(fd, "XXXXXXXX", fe.tag_length - length);
2035     }
2036
2037     return i;
2038 }
2039
2040 inline static struct tempbuf_searchidx* tempbuf_locate(int id)
2041 {
2042     if (id < 0 || id >= lookup_buffer_depth)
2043         return NULL;
2044
2045     return lookup[id];
2046 }
2047
2048
2049 inline static int tempbuf_find_location(int id)
2050 {
2051     struct tempbuf_searchidx *entry;
2052
2053     entry = tempbuf_locate(id);
2054     if (entry == NULL)
2055         return -1;
2056
2057     return entry->seek;
2058 }
2059
2060 static bool build_numeric_indices(struct tagcache_header *h, int tmpfd)
2061 {
2062     struct master_header tcmh;
2063     struct index_entry idx;
2064     int masterfd;
2065     int masterfd_pos;
2066     struct temp_file_entry *entrybuf = (struct temp_file_entry *)tempbuf;
2067     int max_entries;
2068     int entries_processed = 0;
2069     int i, j;
2070     char buf[TAG_MAXLEN];
2071
2072     max_entries = tempbuf_size / sizeof(struct temp_file_entry) - 1;
2073
2074     logf("Building numeric indices...");
2075     lseek(tmpfd, sizeof(struct tagcache_header), SEEK_SET);
2076
2077     if ( (masterfd = open_master_fd(&tcmh, true)) < 0)
2078         return false;
2079
2080     masterfd_pos = lseek(masterfd, tcmh.tch.entry_count * sizeof(struct index_entry),
2081                          SEEK_CUR);
2082     if (masterfd_pos == filesize(masterfd))
2083     {
2084         logf("we can't append!");
2085         close(masterfd);
2086         return false;
2087     }
2088
2089     while (entries_processed < h->entry_count)
2090     {
2091         int count = MIN(h->entry_count - entries_processed, max_entries);
2092
2093         /* Read in as many entries as possible. */
2094         for (i = 0; i < count; i++)
2095         {
2096             struct temp_file_entry *tfe = &entrybuf[i];
2097             int datastart;
2098
2099             /* Read in numeric data. */
2100             if (read(tmpfd, tfe, sizeof(struct temp_file_entry)) !=
2101                 sizeof(struct temp_file_entry))
2102             {
2103                 logf("read fail #1");
2104                 close(masterfd);
2105                 return false;
2106             }
2107
2108             datastart = lseek(tmpfd, 0, SEEK_CUR);
2109
2110             /**
2111              * Read string data from the following tags:
2112              * - tag_filename
2113              * - tag_artist
2114              * - tag_album
2115              * - tag_title
2116              *
2117              * A crc32 hash is calculated from the read data
2118              * and stored back to the data offset field kept in memory.
2119              */
2120 #define tmpdb_read_string_tag(tag) \
2121     lseek(tmpfd, tfe->tag_offset[tag], SEEK_CUR); \
2122     if ((unsigned long)tfe->tag_length[tag] > sizeof buf) \
2123     { \
2124         logf("read fail: buffer overflow"); \
2125         close(masterfd); \
2126         return false; \
2127     } \
2128     \
2129     if (read(tmpfd, buf, tfe->tag_length[tag]) != \
2130         tfe->tag_length[tag]) \
2131     { \
2132         logf("read fail #2"); \
2133         close(masterfd); \
2134         return false; \
2135     } \
2136     \
2137     tfe->tag_offset[tag] = crc_32(buf, strlen(buf), 0xffffffff); \
2138     lseek(tmpfd, datastart, SEEK_SET)
2139
2140             tmpdb_read_string_tag(tag_filename);
2141             tmpdb_read_string_tag(tag_artist);
2142             tmpdb_read_string_tag(tag_album);
2143             tmpdb_read_string_tag(tag_title);
2144
2145             /* Seek to the end of the string data. */
2146             lseek(tmpfd, tfe->data_length, SEEK_CUR);
2147         }
2148
2149         /* Backup the master index position. */
2150         masterfd_pos = lseek(masterfd, 0, SEEK_CUR);
2151         lseek(masterfd, sizeof(struct master_header), SEEK_SET);
2152
2153         /* Check if we can resurrect some deleted runtime statistics data. */
2154         for (i = 0; i < tcmh.tch.entry_count; i++)
2155         {
2156             /* Read the index entry. */
2157             if (ecread(masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
2158                 != sizeof(struct index_entry))
2159             {
2160                 logf("read fail #3");
2161                 close(masterfd);
2162                 return false;
2163             }
2164
2165             /**
2166              * Skip unless the entry is marked as being deleted
2167              * or the data has already been resurrected.
2168              */
2169             if (!(idx.flag & FLAG_DELETED) || idx.flag & FLAG_RESURRECTED)
2170                 continue;
2171
2172             /* Now try to match the entry. */
2173             /**
2174              * To succesfully match a song, the following conditions
2175              * must apply:
2176              *
2177              * For numeric fields: tag_length
2178              * - Full identical match is required
2179              *
2180              * If tag_filename matches, no further checking necessary.
2181              *
2182              * For string hashes: tag_artist, tag_album, tag_title
2183              * - Two of these must match
2184              */
2185             for (j = 0; j < count; j++)
2186             {
2187                 struct temp_file_entry *tfe = &entrybuf[j];
2188
2189                 /* Try to match numeric fields first. */
2190                 if (tfe->tag_offset[tag_length] != idx.tag_seek[tag_length])
2191                     continue;
2192
2193                 /* Now it's time to do the hash matching. */
2194                 if (tfe->tag_offset[tag_filename] != idx.tag_seek[tag_filename])
2195                 {
2196                     int match_count = 0;
2197
2198                     /* No filename match, check if we can match two other tags. */
2199 #define tmpdb_match(tag) \
2200     if (tfe->tag_offset[tag] == idx.tag_seek[tag]) \
2201         match_count++
2202
2203                     tmpdb_match(tag_artist);
2204                     tmpdb_match(tag_album);
2205                     tmpdb_match(tag_title);
2206
2207                     if (match_count < 2)
2208                     {
2209                         /* Still no match found, give up. */
2210                         continue;
2211                     }
2212                 }
2213
2214                 /* A match found, now copy & resurrect the statistical data. */
2215 #define tmpdb_copy_tag(tag) \
2216     tfe->tag_offset[tag] = idx.tag_seek[tag]
2217
2218                 tmpdb_copy_tag(tag_playcount);
2219                 tmpdb_copy_tag(tag_rating);
2220                 tmpdb_copy_tag(tag_playtime);
2221                 tmpdb_copy_tag(tag_lastplayed);
2222                 tmpdb_copy_tag(tag_commitid);
2223
2224                 /* Avoid processing this entry again. */
2225                 idx.flag |= FLAG_RESURRECTED;
2226
2227                 lseek(masterfd, -sizeof(struct index_entry), SEEK_CUR);
2228                 if (ecwrite(masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
2229                     != sizeof(struct index_entry))
2230                 {
2231                     logf("masterfd writeback fail #1");
2232                     close(masterfd);
2233                     return false;
2234                 }
2235
2236                 logf("Entry resurrected");
2237             }
2238         }
2239
2240
2241         /* Restore the master index position. */
2242         lseek(masterfd, masterfd_pos, SEEK_SET);
2243
2244         /* Commit the data to the index. */
2245         for (i = 0; i < count; i++)
2246         {
2247             int loc = lseek(masterfd, 0, SEEK_CUR);
2248
2249             if (ecread(masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
2250                 != sizeof(struct index_entry))
2251             {
2252                 logf("read fail #3");
2253                 close(masterfd);
2254                 return false;
2255             }
2256
2257             for (j = 0; j < TAG_COUNT; j++)
2258             {
2259                 if (!TAGCACHE_IS_NUMERIC(j))
2260                     continue;
2261
2262                 idx.tag_seek[j] = entrybuf[i].tag_offset[j];
2263             }
2264             idx.flag = entrybuf[i].flag;
2265
2266             if (idx.tag_seek[tag_commitid])
2267             {
2268                 /* Data has been resurrected. */
2269                 idx.flag |= FLAG_DIRTYNUM;
2270             }
2271             else if (tc_stat.ready && current_tcmh.commitid > 0)
2272             {
2273                 idx.tag_seek[tag_commitid] = current_tcmh.commitid;
2274                 idx.flag |= FLAG_DIRTYNUM;
2275             }
2276
2277             /* Write back the updated index. */
2278             lseek(masterfd, loc, SEEK_SET);
2279             if (ecwrite(masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
2280                 != sizeof(struct index_entry))
2281             {
2282                 logf("write fail");
2283                 close(masterfd);
2284                 return false;
2285             }
2286         }
2287
2288         entries_processed += count;
2289         logf("%d/%ld entries processed", entries_processed, h->entry_count);
2290     }
2291
2292     close(masterfd);
2293
2294     return true;
2295 }
2296
2297 /**
2298  * Return values:
2299  *     > 0   success
2300  *    == 0   temporary failure
2301  *     < 0   fatal error
2302  */
2303 static int build_index(int index_type, struct tagcache_header *h, int tmpfd)
2304 {
2305     int i;
2306     struct tagcache_header tch;
2307     struct master_header   tcmh;
2308     struct index_entry idxbuf[IDX_BUF_DEPTH];
2309     int idxbuf_pos;
2310     char buf[TAG_MAXLEN+32];
2311     int fd = -1, masterfd;
2312     bool error = false;
2313     int init;
2314     int masterfd_pos;
2315
2316     logf("Building index: %d", index_type);
2317
2318     /* Check the number of entries we need to allocate ram for. */
2319     commit_entry_count = h->entry_count + 1;
2320
2321     masterfd = open_master_fd(&tcmh, false);
2322     if (masterfd >= 0)
2323     {
2324         commit_entry_count += tcmh.tch.entry_count;
2325         close(masterfd);
2326     }
2327     else
2328         remove_files(); /* Just to be sure we are clean. */
2329
2330     /* Open the index file, which contains the tag names. */
2331     fd = open_tag_fd(&tch, index_type, true);
2332     if (fd >= 0)
2333     {
2334         logf("tch.datasize=%ld", tch.datasize);
2335         lookup_buffer_depth = 1 +
2336         /* First part */ commit_entry_count +
2337         /* Second part */ (tch.datasize / TAGFILE_ENTRY_CHUNK_LENGTH);
2338     }
2339     else
2340     {
2341         lookup_buffer_depth = 1 +
2342         /* First part */ commit_entry_count +
2343         /* Second part */ 0;
2344     }
2345
2346     logf("lookup_buffer_depth=%ld", lookup_buffer_depth);
2347     logf("commit_entry_count=%ld", commit_entry_count);
2348
2349     /* Allocate buffer for all index entries from both old and new
2350      * tag files. */
2351     tempbufidx = 0;
2352     tempbuf_pos = commit_entry_count * sizeof(struct tempbuf_searchidx);
2353
2354     /* Allocate lookup buffer. The first portion of commit_entry_count
2355      * contains the new tags in the temporary file and the second
2356      * part for locating entries already in the db.
2357      *
2358      *  New tags  Old tags
2359      * +---------+---------------------------+
2360      * |  index  | position/ENTRY_CHUNK_SIZE |  lookup buffer
2361      * +---------+---------------------------+
2362      *
2363      * Old tags are inserted to a temporary buffer with position:
2364      *     tempbuf_insert(position/ENTRY_CHUNK_SIZE, ...);
2365      * And new tags with index:
2366      *     tempbuf_insert(idx, ...);
2367      *
2368      * The buffer is sorted and written into tag file:
2369      *     tempbuf_sort(...);
2370      * leaving master index locations messed up.
2371      *
2372      * That is fixed using the lookup buffer for old tags:
2373      *     new_seek = tempbuf_find_location(old_seek, ...);
2374      * and for new tags:
2375      *     new_seek = tempbuf_find_location(idx);
2376      */
2377     lookup = (struct tempbuf_searchidx **)&tempbuf[tempbuf_pos];
2378     tempbuf_pos += lookup_buffer_depth * sizeof(void **);
2379     memset(lookup, 0, lookup_buffer_depth * sizeof(void **));
2380
2381     /* And calculate the remaining data space used mainly for storing
2382      * tag data (strings). */
2383     tempbuf_left = tempbuf_size - tempbuf_pos - 8;
2384     if (tempbuf_left - TAGFILE_ENTRY_AVG_LENGTH * commit_entry_count < 0)
2385     {
2386         logf("Buffer way too small!");
2387         return 0;
2388     }
2389
2390     if (fd >= 0)
2391     {
2392         /**
2393          * If tag file contains unique tags (sorted index), we will load
2394          * it entirely into memory so we can resort it later for use with
2395          * chunked browsing.
2396          */
2397         if (TAGCACHE_IS_SORTED(index_type))
2398         {
2399             logf("loading tags...");
2400             for (i = 0; i < tch.entry_count; i++)
2401             {
2402                 struct tagfile_entry entry;
2403                 int loc = lseek(fd, 0, SEEK_CUR);
2404                 bool ret;
2405
2406                 if (ecread(fd, &entry, 1, tagfile_entry_ec, tc_stat.econ)
2407                     != sizeof(struct tagfile_entry))
2408                 {
2409                     logf("read error #7");
2410                     close(fd);
2411                     return -2;
2412                 }
2413
2414                 if (entry.tag_length >= (int)sizeof(buf))
2415                 {
2416                     logf("too long tag #3");
2417                     close(fd);
2418                     return -2;
2419                 }
2420
2421                 if (read(fd, buf, entry.tag_length) != entry.tag_length)
2422                 {
2423                     logf("read error #8");
2424                     close(fd);
2425                     return -2;
2426                 }
2427
2428                 /* Skip deleted entries. */
2429                 if (buf[0] == '\0')
2430                     continue;
2431
2432                 /**
2433                  * Save the tag and tag id in the memory buffer. Tag id
2434                  * is saved so we can later reindex the master lookup
2435                  * table when the index gets resorted.
2436                  */
2437                 ret = tempbuf_insert(buf, loc/TAGFILE_ENTRY_CHUNK_LENGTH
2438                                      + commit_entry_count, entry.idx_id,
2439                                      TAGCACHE_IS_UNIQUE(index_type));
2440                 if (!ret)
2441                 {
2442                     close(fd);
2443                     return -3;
2444                 }
2445                 do_timed_yield();
2446             }
2447             logf("done");
2448         }
2449         else
2450             tempbufidx = tch.entry_count;
2451     }
2452     else
2453     {
2454         /**
2455          * Creating new index file to store the tags. No need to preload
2456          * anything whether the index type is sorted or not.
2457          */
2458         snprintf(buf, sizeof buf, TAGCACHE_FILE_INDEX, index_type);
2459         fd = open(buf, O_WRONLY | O_CREAT | O_TRUNC);
2460         if (fd < 0)
2461         {
2462             logf("%s open fail", buf);
2463             return -2;
2464         }
2465
2466         tch.magic = TAGCACHE_MAGIC;
2467         tch.entry_count = 0;
2468         tch.datasize = 0;
2469
2470         if (ecwrite(fd, &tch, 1, tagcache_header_ec, tc_stat.econ)
2471             != sizeof(struct tagcache_header))
2472         {
2473             logf("header write failed");
2474             close(fd);
2475             return -2;
2476         }
2477     }
2478
2479     /* Loading the tag lookup file as "master file". */
2480     logf("Loading index file");
2481     masterfd = open(TAGCACHE_FILE_MASTER, O_RDWR);
2482
2483     if (masterfd < 0)
2484     {
2485         logf("Creating new DB");
2486         masterfd = open(TAGCACHE_FILE_MASTER, O_WRONLY | O_CREAT | O_TRUNC);
2487
2488         if (masterfd < 0)
2489         {
2490             logf("Failure to create index file (%s)", TAGCACHE_FILE_MASTER);
2491             close(fd);
2492             return -2;
2493         }
2494
2495         /* Write the header (write real values later). */
2496         memset(&tcmh, 0, sizeof(struct master_header));
2497         tcmh.tch = *h;
2498         tcmh.tch.entry_count = 0;
2499         tcmh.tch.datasize = 0;
2500         tcmh.dirty = true;
2501         ecwrite(masterfd, &tcmh, 1, master_header_ec, tc_stat.econ);
2502         init = true;
2503         masterfd_pos = lseek(masterfd, 0, SEEK_CUR);
2504     }
2505     else
2506     {
2507         /**
2508          * Master file already exists so we need to process the current
2509          * file first.
2510          */
2511         init = false;
2512
2513         if (ecread(masterfd, &tcmh, 1, master_header_ec, tc_stat.econ) !=
2514             sizeof(struct master_header) || tcmh.tch.magic != TAGCACHE_MAGIC)
2515         {
2516             logf("header error");
2517             close(fd);
2518             close(masterfd);
2519             return -2;
2520         }
2521
2522         /**
2523          * If we reach end of the master file, we need to expand it to
2524          * hold new tags. If the current index is not sorted, we can
2525          * simply append new data to end of the file.
2526          * However, if the index is sorted, we need to update all tag
2527          * pointers in the master file for the current index.
2528          */
2529         masterfd_pos = lseek(masterfd, tcmh.tch.entry_count * sizeof(struct index_entry),
2530             SEEK_CUR);
2531         if (masterfd_pos == filesize(masterfd))
2532         {
2533             logf("appending...");
2534             init = true;
2535         }
2536     }
2537
2538     /**
2539      * Load new unique tags in memory to be sorted later and added
2540      * to the master lookup file.
2541      */
2542     if (TAGCACHE_IS_SORTED(index_type))
2543     {
2544         lseek(tmpfd, sizeof(struct tagcache_header), SEEK_SET);
2545         /* h is the header of the temporary file containing new tags. */
2546         logf("inserting new tags...");
2547         for (i = 0; i < h->entry_count; i++)
2548         {
2549             struct temp_file_entry entry;
2550
2551             if (read(tmpfd, &entry, sizeof(struct temp_file_entry)) !=
2552                 sizeof(struct temp_file_entry))
2553             {
2554                 logf("read fail #3");
2555                 error = true;
2556                 goto error_exit;
2557             }
2558
2559             /* Read data. */
2560             if (entry.tag_length[index_type] >= (long)sizeof(buf))
2561             {
2562                 logf("too long entry!");
2563                 error = true;
2564                 goto error_exit;
2565             }
2566
2567             lseek(tmpfd, entry.tag_offset[index_type], SEEK_CUR);
2568             if (read(tmpfd, buf, entry.tag_length[index_type]) !=
2569                 entry.tag_length[index_type])
2570             {
2571                 logf("read fail #4");
2572                 error = true;
2573                 goto error_exit;
2574             }
2575
2576             if (TAGCACHE_IS_UNIQUE(index_type))
2577                 error = !tempbuf_insert(buf, i, -1, true);
2578             else
2579                 error = !tempbuf_insert(buf, i, tcmh.tch.entry_count + i, false);
2580
2581             if (error)
2582             {
2583                 logf("insert error");
2584                 goto error_exit;
2585             }
2586
2587             /* Skip to next. */
2588             lseek(tmpfd, entry.data_length - entry.tag_offset[index_type] -
2589                     entry.tag_length[index_type], SEEK_CUR);
2590             do_timed_yield();
2591         }
2592         logf("done");
2593
2594         /* Sort the buffer data and write it to the index file. */
2595         lseek(fd, sizeof(struct tagcache_header), SEEK_SET);
2596         /**
2597          * We need to truncate the index file now. There can be junk left
2598          * at the end of file (however, we _should_ always follow the
2599          * entry_count and don't crash with that).
2600          */
2601         ftruncate(fd, lseek(fd, 0, SEEK_CUR));
2602
2603         i = tempbuf_sort(fd);
2604         if (i < 0)
2605             goto error_exit;
2606         logf("sorted %d tags", i);
2607
2608         /**
2609          * Now update all indexes in the master lookup file.
2610          */
2611         logf("updating indices...");
2612         lseek(masterfd, sizeof(struct master_header), SEEK_SET);
2613         for (i = 0; i < tcmh.tch.entry_count; i += idxbuf_pos)
2614         {
2615             int j;
2616             int loc = lseek(masterfd, 0, SEEK_CUR);
2617
2618             idxbuf_pos = MIN(tcmh.tch.entry_count - i, IDX_BUF_DEPTH);
2619
2620             if (ecread(masterfd, idxbuf, idxbuf_pos, index_entry_ec, tc_stat.econ)
2621                 != (int)sizeof(struct index_entry)*idxbuf_pos)
2622             {
2623                 logf("read fail #5");
2624                 error = true;
2625                 goto error_exit ;
2626             }
2627             lseek(masterfd, loc, SEEK_SET);
2628
2629             for (j = 0; j < idxbuf_pos; j++)
2630             {
2631                 if (idxbuf[j].flag & FLAG_DELETED)
2632                 {
2633                     /* We can just ignore deleted entries. */
2634                     // idxbuf[j].tag_seek[index_type] = 0;
2635                     continue;
2636                 }
2637
2638                 idxbuf[j].tag_seek[index_type] = tempbuf_find_location(
2639                     idxbuf[j].tag_seek[index_type]/TAGFILE_ENTRY_CHUNK_LENGTH
2640                     + commit_entry_count);
2641
2642                 if (idxbuf[j].tag_seek[index_type] < 0)
2643                 {
2644                     logf("update error: %d/%d/%d",
2645                          idxbuf[j].flag, i+j, tcmh.tch.entry_count);
2646                     error = true;
2647                     goto error_exit;
2648                 }
2649
2650                 do_timed_yield();
2651             }
2652
2653             /* Write back the updated index. */
2654             if (ecwrite(masterfd, idxbuf, idxbuf_pos,
2655                         index_entry_ec, tc_stat.econ) !=
2656                 (int)sizeof(struct index_entry)*idxbuf_pos)
2657             {
2658                 logf("write fail");
2659                 error = true;
2660                 goto error_exit;
2661             }
2662         }
2663         logf("done");
2664     }
2665
2666     /**
2667      * Walk through the temporary file containing the new tags.
2668      */
2669     // build_normal_index(h, tmpfd, masterfd, idx);
2670     logf("updating new indices...");
2671     lseek(masterfd, masterfd_pos, SEEK_SET);
2672     lseek(tmpfd, sizeof(struct tagcache_header), SEEK_SET);
2673     lseek(fd, 0, SEEK_END);
2674     for (i = 0; i < h->entry_count; i += idxbuf_pos)
2675     {
2676         int j;
2677
2678         idxbuf_pos = MIN(h->entry_count - i, IDX_BUF_DEPTH);
2679         if (init)
2680         {
2681             memset(idxbuf, 0, sizeof(struct index_entry)*IDX_BUF_DEPTH);
2682         }
2683         else
2684         {
2685             int loc = lseek(masterfd, 0, SEEK_CUR);
2686
2687             if (ecread(masterfd, idxbuf, idxbuf_pos, index_entry_ec, tc_stat.econ)
2688                 != (int)sizeof(struct index_entry)*idxbuf_pos)
2689             {
2690                 logf("read fail #6");
2691                 error = true;
2692                 break ;
2693             }
2694             lseek(masterfd, loc, SEEK_SET);
2695         }
2696
2697         /* Read entry headers. */
2698         for (j = 0; j < idxbuf_pos; j++)
2699         {
2700             if (!TAGCACHE_IS_SORTED(index_type))
2701             {
2702                 struct temp_file_entry entry;
2703                 struct tagfile_entry fe;
2704
2705                 if (read(tmpfd, &entry, sizeof(struct temp_file_entry)) !=
2706                     sizeof(struct temp_file_entry))
2707                 {
2708                     logf("read fail #7");
2709                     error = true;
2710                     break ;
2711                 }
2712
2713                 /* Read data. */
2714                 if (entry.tag_length[index_type] >= (int)sizeof(buf))
2715                 {
2716                     logf("too long entry!");
2717                     logf("length=%d", entry.tag_length[index_type]);
2718                     logf("pos=0x%02lx", lseek(tmpfd, 0, SEEK_CUR));
2719                     error = true;
2720                     break ;
2721                 }
2722
2723                 lseek(tmpfd, entry.tag_offset[index_type], SEEK_CUR);
2724                 if (read(tmpfd, buf, entry.tag_length[index_type]) !=
2725                     entry.tag_length[index_type])
2726                 {
2727                     logf("read fail #8");
2728                     logf("offset=0x%02lx", entry.tag_offset[index_type]);
2729                     logf("length=0x%02x", entry.tag_length[index_type]);
2730                     error = true;
2731                     break ;
2732                 }
2733
2734                 /* Write to index file. */
2735                 idxbuf[j].tag_seek[index_type] = lseek(fd, 0, SEEK_CUR);
2736                 fe.tag_length = entry.tag_length[index_type];
2737                 fe.idx_id = tcmh.tch.entry_count + i + j;
2738                 ecwrite(fd, &fe, 1, tagfile_entry_ec, tc_stat.econ);
2739                 write(fd, buf, fe.tag_length);
2740                 tempbufidx++;
2741
2742                 /* Skip to next. */
2743                 lseek(tmpfd, entry.data_length - entry.tag_offset[index_type] -
2744                       entry.tag_length[index_type], SEEK_CUR);
2745             }
2746             else
2747             {
2748                 /* Locate the correct entry from the sorted array. */
2749                 idxbuf[j].tag_seek[index_type] = tempbuf_find_location(i + j);
2750                 if (idxbuf[j].tag_seek[index_type] < 0)
2751                 {
2752                     logf("entry not found (%d)", j);
2753                     error = true;
2754                     break ;
2755                 }
2756             }
2757         }
2758
2759         /* Write index. */
2760         if (ecwrite(masterfd, idxbuf, idxbuf_pos,
2761                   index_entry_ec, tc_stat.econ) !=
2762             (int)sizeof(struct index_entry)*idxbuf_pos)
2763         {
2764             logf("tagcache: write fail #4");
2765             error = true;
2766             break ;
2767         }
2768
2769         do_timed_yield();
2770     }
2771     logf("done");
2772
2773     /* Finally write the header. */
2774     tch.magic = TAGCACHE_MAGIC;
2775     tch.entry_count = tempbufidx;
2776     tch.datasize = lseek(fd, 0, SEEK_END) - sizeof(struct tagcache_header);
2777     lseek(fd, 0, SEEK_SET);
2778     ecwrite(fd, &tch, 1, tagcache_header_ec, tc_stat.econ);
2779
2780     if (index_type != tag_filename)
2781         h->datasize += tch.datasize;
2782     logf("s:%d/%ld/%ld", index_type, tch.datasize, h->datasize);
2783     error_exit:
2784
2785     close(fd);
2786     close(masterfd);
2787
2788     if (error)
2789         return -2;
2790
2791     return 1;
2792 }
2793
2794 static bool commit(void)
2795 {
2796     struct tagcache_header tch;
2797     struct master_header   tcmh;
2798     int i, len, rc;
2799     int tmpfd;
2800     int masterfd;
2801 #ifdef HAVE_DIRCACHE
2802     bool dircache_buffer_stolen = false;
2803 #endif
2804     bool local_allocation = false;
2805
2806     logf("committing tagcache");
2807
2808     while (write_lock)
2809         sleep(1);
2810
2811     tmpfd = open(TAGCACHE_FILE_TEMP, O_RDONLY);
2812     if (tmpfd < 0)
2813     {
2814         logf("nothing to commit");
2815         return true;
2816     }
2817
2818
2819     /* Load the header. */
2820     len = sizeof(struct tagcache_header);
2821     rc = read(tmpfd, &tch, len);
2822
2823     if (tch.magic != TAGCACHE_MAGIC || rc != len)
2824     {
2825         logf("incorrect header");
2826         close(tmpfd);
2827         remove(TAGCACHE_FILE_TEMP);
2828         return false;
2829     }
2830
2831     if (tch.entry_count == 0)
2832     {
2833         logf("nothing to commit");
2834         close(tmpfd);
2835         remove(TAGCACHE_FILE_TEMP);
2836         return true;
2837     }
2838
2839 #ifdef HAVE_EEPROM_SETTINGS
2840     remove(TAGCACHE_STATEFILE);
2841 #endif
2842
2843     /* At first be sure to unload the ramcache! */
2844 #ifdef HAVE_TC_RAMCACHE
2845     tc_stat.ramcache = false;
2846 #endif
2847
2848     read_lock++;
2849
2850     /* Try to steal every buffer we can :) */
2851     if (tempbuf_size == 0)
2852         local_allocation = true;
2853
2854 #ifdef HAVE_DIRCACHE
2855     if (tempbuf_size == 0)
2856     {
2857         /* Try to steal the dircache buffer. */
2858         tempbuf = dircache_steal_buffer(&tempbuf_size);
2859         tempbuf_size &= ~0x03;
2860
2861         if (tempbuf_size > 0)
2862         {
2863             dircache_buffer_stolen = true;
2864         }
2865     }
2866 #endif
2867
2868 #ifdef HAVE_TC_RAMCACHE
2869     if (tempbuf_size == 0 && tc_stat.ramcache_allocated > 0)
2870     {
2871         tempbuf = (char *)(hdr + 1);
2872         tempbuf_size = tc_stat.ramcache_allocated - sizeof(struct ramcache_header) - 128;
2873         tempbuf_size &= ~0x03;
2874     }
2875 #endif
2876
2877     /* And finally fail if there are no buffers available. */
2878     if (tempbuf_size == 0)
2879     {
2880         logf("delaying commit until next boot");
2881         tc_stat.commit_delayed = true;
2882         close(tmpfd);
2883         read_lock--;
2884         return false;
2885     }
2886
2887     logf("commit %ld entries...", tch.entry_count);
2888
2889     /* Mark DB dirty so it will stay disabled if commit fails. */
2890     current_tcmh.dirty = true;
2891     update_master_header();
2892
2893     /* Now create the index files. */
2894     tc_stat.commit_step = 0;
2895     tch.datasize = 0;
2896     tc_stat.commit_delayed = false;
2897
2898     for (i = 0; i < TAG_COUNT; i++)
2899     {
2900         int ret;
2901
2902         if (TAGCACHE_IS_NUMERIC(i))
2903             continue;
2904
2905         tc_stat.commit_step++;
2906         ret = build_index(i, &tch, tmpfd);
2907         if (ret <= 0)
2908         {
2909             close(tmpfd);
2910             logf("tagcache failed init");
2911             if (ret == 0)
2912                 tc_stat.commit_delayed = true;
2913
2914             tc_stat.commit_step = 0;
2915             read_lock--;
2916             return false;
2917         }
2918     }
2919
2920     if (!build_numeric_indices(&tch, tmpfd))
2921     {
2922         logf("Failure to commit numeric indices");
2923         close(tmpfd);
2924         tc_stat.commit_step = 0;
2925         read_lock--;
2926         return false;
2927     }
2928
2929     close(tmpfd);
2930     remove(TAGCACHE_FILE_TEMP);
2931
2932     tc_stat.commit_step = 0;
2933
2934     /* Update the master index headers. */
2935     if ( (masterfd = open_master_fd(&tcmh, true)) < 0)
2936     {
2937         read_lock--;
2938         return false;
2939     }
2940
2941     tcmh.tch.entry_count += tch.entry_count;
2942     tcmh.tch.datasize = sizeof(struct master_header)
2943         + sizeof(struct index_entry) * tcmh.tch.entry_count
2944         + tch.datasize;
2945     tcmh.dirty = false;
2946     tcmh.commitid++;
2947
2948     lseek(masterfd, 0, SEEK_SET);
2949     ecwrite(masterfd, &tcmh, 1, master_header_ec, tc_stat.econ);
2950     close(masterfd);
2951
2952     logf("tagcache committed");
2953     tc_stat.ready = check_all_headers();
2954     tc_stat.readyvalid = true;
2955
2956     if (local_allocation)
2957     {
2958         tempbuf = NULL;
2959         tempbuf_size = 0;
2960     }
2961
2962 #ifdef HAVE_DIRCACHE
2963     /* Rebuild the dircache, if we stole the buffer. */
2964     if (dircache_buffer_stolen)
2965         dircache_build(0);
2966 #endif
2967
2968 #ifdef HAVE_TC_RAMCACHE
2969     /* Reload tagcache. */
2970     if (tc_stat.ramcache_allocated > 0)
2971         tagcache_start_scan();
2972 #endif
2973
2974     read_lock--;
2975
2976     return true;
2977 }
2978
2979 static void allocate_tempbuf(void)
2980 {
2981     /* Yeah, malloc would be really nice now :) */
2982 #ifdef __PCTOOL__
2983     tempbuf_size = 32*1024*1024;
2984     tempbuf = malloc(tempbuf_size);
2985 #else
2986     tempbuf = (char *)(((long)audiobuf & ~0x03) + 0x04);
2987     tempbuf_size = (long)audiobufend - (long)audiobuf - 4;
2988     audiobuf += tempbuf_size;
2989 #endif
2990 }
2991
2992 static void free_tempbuf(void)
2993 {
2994     if (tempbuf_size == 0)
2995         return ;
2996
2997 #ifdef __PCTOOL__
2998     free(tempbuf);
2999 #else
3000     audiobuf -= tempbuf_size;
3001 #endif
3002     tempbuf = NULL;
3003     tempbuf_size = 0;
3004 }
3005
3006 #ifndef __PCTOOL__
3007
3008 static bool modify_numeric_entry(int masterfd, int idx_id, int tag, long data)
3009 {
3010     struct index_entry idx;
3011
3012     if (!tc_stat.ready)
3013         return false;
3014
3015     if (!TAGCACHE_IS_NUMERIC(tag))
3016         return false;
3017
3018     if (!get_index(masterfd, idx_id, &idx, false))
3019         return false;
3020
3021     idx.tag_seek[tag] = data;
3022     idx.flag |= FLAG_DIRTYNUM;
3023
3024     return write_index(masterfd, idx_id, &idx);
3025 }
3026
3027 #if 0
3028 bool tagcache_modify_numeric_entry(struct tagcache_search *tcs,
3029                                    int tag, long data)
3030 {
3031     struct master_header myhdr;
3032
3033     if (tcs->masterfd < 0)
3034     {
3035         if ( (tcs->masterfd = open_master_fd(&myhdr, true)) < 0)
3036             return false;
3037     }
3038
3039     return modify_numeric_entry(tcs->masterfd, tcs->idx_id, tag, data);
3040 }
3041 #endif
3042
3043 #define COMMAND_QUEUE_IS_EMPTY (command_queue_ridx == command_queue_widx)
3044
3045 static bool command_queue_is_full(void)
3046 {
3047     int next;
3048
3049     next = command_queue_widx + 1;
3050     if (next >= TAGCACHE_COMMAND_QUEUE_LENGTH)
3051         next = 0;
3052
3053     return (next == command_queue_ridx);
3054 }
3055
3056 static bool command_queue_sync_callback(void)
3057 {
3058
3059     struct master_header myhdr;
3060     int masterfd;
3061
3062     mutex_lock(&command_queue_mutex);
3063
3064     if ( (masterfd = open_master_fd(&myhdr, true)) < 0)
3065         return false;
3066
3067     while (command_queue_ridx != command_queue_widx)
3068     {
3069         struct tagcache_command_entry *ce = &command_queue[command_queue_ridx];
3070
3071         switch (ce->command)
3072         {
3073             case CMD_UPDATE_MASTER_HEADER:
3074             {
3075                 close(masterfd);
3076                 update_master_header();
3077
3078                 /* Re-open the masterfd. */
3079                 if ( (masterfd = open_master_fd(&myhdr, true)) < 0)
3080                     return true;
3081
3082                 break;
3083             }
3084             case CMD_UPDATE_NUMERIC:
3085             {
3086                 modify_numeric_entry(masterfd, ce->idx_id, ce->tag, ce->data);
3087                 break;
3088             }
3089         }
3090
3091         if (++command_queue_ridx >= TAGCACHE_COMMAND_QUEUE_LENGTH)
3092             command_queue_ridx = 0;
3093     }
3094
3095     close(masterfd);
3096
3097     tc_stat.queue_length = 0;
3098     mutex_unlock(&command_queue_mutex);
3099     return true;
3100 }
3101
3102 static void run_command_queue(bool force)
3103 {
3104     if (COMMAND_QUEUE_IS_EMPTY)
3105         return;
3106
3107     if (force || command_queue_is_full())
3108         command_queue_sync_callback();
3109     else
3110         register_storage_idle_func(command_queue_sync_callback);
3111 }
3112
3113 static void queue_command(int cmd, long idx_id, int tag, long data)
3114 {
3115     while (1)
3116     {
3117         int next;
3118
3119         mutex_lock(&command_queue_mutex);
3120         next = command_queue_widx + 1;
3121         if (next >= TAGCACHE_COMMAND_QUEUE_LENGTH)
3122             next = 0;
3123
3124         /* Make sure queue is not full. */
3125         if (next != command_queue_ridx)
3126         {
3127             struct tagcache_command_entry *ce = &command_queue[command_queue_widx];
3128
3129             ce->command = cmd;
3130             ce->idx_id = idx_id;
3131             ce->tag = tag;
3132             ce->data = data;
3133
3134             command_queue_widx = next;
3135
3136             tc_stat.queue_length++;
3137
3138             mutex_unlock(&command_queue_mutex);
3139             break;
3140         }
3141
3142         /* Queue is full, try again later... */
3143         mutex_unlock(&command_queue_mutex);
3144         sleep(1);
3145     }
3146 }
3147
3148 long tagcache_increase_serial(void)
3149 {
3150     long old;
3151
3152     if (!tc_stat.ready)
3153         return -2;
3154
3155     while (read_lock)
3156         sleep(1);
3157
3158     old = current_tcmh.serial++;
3159     queue_command(CMD_UPDATE_MASTER_HEADER, 0, 0, 0);
3160
3161     return old;
3162 }
3163
3164 void tagcache_update_numeric(int idx_id, int tag, long data)
3165 {
3166     queue_command(CMD_UPDATE_NUMERIC, idx_id, tag, data);
3167 }
3168 #endif /* !__PCTOOL__ */
3169
3170 long tagcache_get_serial(void)
3171 {
3172     return current_tcmh.serial;
3173 }
3174
3175 long tagcache_get_commitid(void)
3176 {
3177     return current_tcmh.commitid;
3178 }
3179
3180 static bool write_tag(int fd, const char *tagstr, const char *datastr)
3181 {
3182     char buf[512];
3183     int i;
3184
3185     snprintf(buf, sizeof buf, "%s=\"", tagstr);
3186     for (i = strlen(buf); i < (long)sizeof(buf)-4; i++)
3187     {
3188         if (*datastr == '\0')
3189             break;
3190
3191         if (*datastr == '"' || *datastr == '\\')
3192             buf[i++] = '\\';
3193
3194         buf[i] = *(datastr++);
3195     }
3196
3197     strcpy(&buf[i], "\" ");
3198
3199     write(fd, buf, i + 2);
3200
3201     return true;
3202 }
3203
3204 #ifndef __PCTOOL__
3205
3206 static bool read_tag(char *dest, long size,
3207                      const char *src, const char *tagstr)
3208 {
3209     int pos;
3210     char current_tag[32];
3211
3212     while (*src != '\0')
3213     {
3214         /* Skip all whitespace */
3215         while (*src == ' ')
3216             src++;
3217
3218         if (*src == '\0')
3219             break;
3220
3221         pos = 0;
3222         /* Read in tag name */
3223         while (*src != '=' && *src != ' ')
3224         {
3225             current_tag[pos] = *src;
3226             src++;
3227             pos++;
3228
3229             if (*src == '\0' || pos >= (long)sizeof(current_tag))
3230                 return false;
3231         }
3232         current_tag[pos] = '\0';
3233
3234         /* Read in tag data */
3235
3236         /* Find the start. */
3237         while (*src != '"' && *src != '\0')
3238             src++;
3239
3240         if (*src == '\0' || *(++src) == '\0')
3241             return false;
3242
3243         /* Read the data. */
3244         for (pos = 0; pos < size; pos++)
3245         {
3246             if (*src == '\0')
3247                 break;
3248
3249             if (*src == '\\')
3250             {
3251                 dest[pos] = *(src+1);
3252                 src += 2;
3253                 continue;
3254             }
3255
3256             dest[pos] = *src;
3257
3258             if (*src == '"')
3259             {
3260                 src++;
3261                 break;
3262             }
3263
3264             if (*src == '\0')
3265                 break;
3266
3267             src++;
3268         }
3269         dest[pos] = '\0';
3270
3271         if (!strcasecmp(tagstr, current_tag))
3272             return true;
3273     }
3274
3275     return false;
3276 }
3277
3278 static int parse_changelog_line(int line_n, const char *buf, void *parameters)
3279 {
3280     struct index_entry idx;
3281     char tag_data[TAG_MAXLEN+32];
3282     int idx_id;
3283     long masterfd = (long)parameters;
3284     const int import_tags[] = { tag_playcount, tag_rating, tag_playtime, tag_lastplayed,
3285         tag_commitid };
3286     int i;
3287     (void)line_n;
3288
3289     if (*buf == '#')
3290         return 0;
3291
3292     logf("%d/%s", line_n, buf);
3293     if (!read_tag(tag_data, sizeof tag_data, buf, "filename"))
3294     {
3295         logf("filename missing");
3296         logf("-> %s", buf);
3297         return 0;
3298     }
3299
3300     idx_id = find_index(tag_data);
3301     if (idx_id < 0)
3302     {
3303         logf("entry not found");
3304         return 0;
3305     }
3306
3307     if (!get_index(masterfd, idx_id, &idx, false))
3308     {
3309         logf("failed to retrieve index entry");
3310         return 0;
3311     }
3312
3313     /* Stop if tag has already been modified. */
3314     if (idx.flag & FLAG_DIRTYNUM)
3315         return 0;
3316
3317     logf("import: %s", tag_data);
3318
3319     idx.flag |= FLAG_DIRTYNUM;
3320     for (i = 0; i < (long)(sizeof(import_tags)/sizeof(import_tags[0])); i++)
3321     {
3322         int data;
3323
3324         if (!read_tag(tag_data, sizeof tag_data, buf,
3325                       tagcache_tag_to_str(import_tags[i])))
3326         {
3327             continue;
3328         }
3329
3330         data = atoi(tag_data);
3331         if (data < 0)
3332             continue;
3333
3334         idx.tag_seek[import_tags[i]] = data;
3335
3336         if (import_tags[i] == tag_lastplayed && data >= current_tcmh.serial)
3337             current_tcmh.serial = data + 1;
3338         else if (import_tags[i] == tag_commitid && data >= current_tcmh.commitid)
3339             current_tcmh.commitid = data + 1;
3340     }
3341
3342     return write_index(masterfd, idx_id, &idx) ? 0 : -5;
3343 }
3344
3345 bool tagcache_import_changelog(void)
3346 {
3347     struct master_header myhdr;
3348     struct tagcache_header tch;
3349     int clfd;
3350     long masterfd;
3351     char buf[2048];
3352
3353     if (!tc_stat.ready)
3354         return false;
3355
3356     while (read_lock)
3357         sleep(1);
3358
3359     clfd = open(TAGCACHE_FILE_CHANGELOG, O_RDONLY);
3360     if (clfd < 0)
3361     {
3362         logf("failure to open changelog");
3363         return false;
3364     }
3365
3366     if ( (masterfd = open_master_fd(&myhdr, true)) < 0)
3367     {
3368         close(clfd);
3369         return false;
3370     }
3371
3372     write_lock++;
3373
3374     filenametag_fd = open_tag_fd(&tch, tag_filename, false);
3375
3376     fast_readline(clfd, buf, sizeof buf, (long *)masterfd,
3377                   parse_changelog_line);
3378
3379     close(clfd);
3380     close(masterfd);
3381
3382     if (filenametag_fd >= 0)
3383     {
3384         close(filenametag_fd);
3385         filenametag_fd = -1;
3386     }
3387
3388     write_lock--;
3389
3390     update_master_header();
3391
3392     return true;
3393 }
3394
3395 #endif /* !__PCTOOL__ */
3396
3397 bool tagcache_create_changelog(struct tagcache_search *tcs)
3398 {
3399     struct master_header myhdr;
3400     struct index_entry idx;
3401     char buf[TAG_MAXLEN+32];
3402     char temp[32];
3403     int clfd;
3404     int i, j;
3405
3406     if (!tc_stat.ready)
3407         return false;
3408
3409     if (!tagcache_search(tcs, tag_filename))
3410         return false;
3411
3412     /* Initialize the changelog */
3413     clfd = open(TAGCACHE_FILE_CHANGELOG, O_WRONLY | O_CREAT | O_TRUNC);
3414     if (clfd < 0)
3415     {
3416         logf("failure to open changelog");
3417         return false;
3418     }
3419
3420     if (tcs->masterfd < 0)
3421     {
3422         if ( (tcs->masterfd = open_master_fd(&myhdr, false)) < 0)
3423             return false;
3424     }
3425     else
3426     {
3427         lseek(tcs->masterfd, 0, SEEK_SET);
3428         ecread(tcs->masterfd, &myhdr, 1, master_header_ec, tc_stat.econ);
3429     }
3430
3431     write(clfd, "## Changelog version 1\n", 23);
3432
3433     for (i = 0; i < myhdr.tch.entry_count; i++)
3434     {
3435         if (ecread(tcs->masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
3436             != sizeof(struct index_entry))
3437         {
3438             logf("read error #9");
3439             tagcache_search_finish(tcs);
3440             close(clfd);
3441             return false;
3442         }
3443
3444         /* Skip until the entry found has been modified. */
3445         if (! (idx.flag & FLAG_DIRTYNUM) )
3446             continue;
3447
3448         /* Skip deleted entries too. */
3449         if (idx.flag & FLAG_DELETED)
3450             continue;
3451
3452         /* Now retrieve all tags. */
3453         for (j = 0; j < TAG_COUNT; j++)
3454         {
3455             if (TAGCACHE_IS_NUMERIC(j))
3456             {
3457                 snprintf(temp, sizeof temp, "%d", idx.tag_seek[j]);
3458                 write_tag(clfd, tagcache_tag_to_str(j), temp);
3459                 continue;
3460             }
3461
3462             tcs->type = j;
3463             tagcache_retrieve(tcs, i, tcs->type, buf, sizeof buf);
3464             write_tag(clfd, tagcache_tag_to_str(j), buf);
3465         }
3466
3467         write(clfd, "\n", 1);
3468         do_timed_yield();
3469     }
3470
3471     close(clfd);
3472
3473     tagcache_search_finish(tcs);
3474
3475     return true;
3476 }
3477
3478 static bool delete_entry(long idx_id)
3479 {
3480     int fd = -1;
3481     int masterfd = -1;
3482     int tag, i;
3483     struct index_entry idx, myidx;
3484     struct master_header myhdr;
3485     char buf[TAG_MAXLEN+32];
3486     int in_use[TAG_COUNT];
3487
3488     logf("delete_entry(): %ld", idx_id);
3489
3490 #ifdef HAVE_TC_RAMCACHE
3491     /* At first mark the entry removed from ram cache. */
3492     if (tc_stat.ramcache)
3493         hdr->indices[idx_id].flag |= FLAG_DELETED;
3494 #endif
3495
3496     if ( (masterfd = open_master_fd(&myhdr, true) ) < 0)
3497         return false;
3498
3499     lseek(masterfd, idx_id * sizeof(struct index_entry), SEEK_CUR);
3500     if (ecread(masterfd, &myidx, 1, index_entry_ec, tc_stat.econ)
3501         != sizeof(struct index_entry))
3502     {
3503         logf("delete_entry(): read error");
3504         goto cleanup;
3505     }
3506
3507     if (myidx.flag & FLAG_DELETED)
3508     {
3509         logf("delete_entry(): already deleted!");
3510         goto cleanup;
3511     }
3512
3513     myidx.flag |= FLAG_DELETED;
3514     lseek(masterfd, -sizeof(struct index_entry), SEEK_CUR);
3515     if (ecwrite(masterfd, &myidx, 1, index_entry_ec, tc_stat.econ)
3516         != sizeof(struct index_entry))
3517     {
3518         logf("delete_entry(): write_error #1");
3519         goto cleanup;
3520     }
3521
3522     /* Now check which tags are no longer in use (if any) */
3523     for (tag = 0; tag < TAG_COUNT; tag++)
3524         in_use[tag] = 0;
3525
3526     lseek(masterfd, sizeof(struct master_header), SEEK_SET);
3527     for (i = 0; i < myhdr.tch.entry_count; i++)
3528     {
3529         struct index_entry *idxp;
3530
3531 #ifdef HAVE_TC_RAMCACHE
3532         /* Use RAM DB if available for greater speed */
3533         if (tc_stat.ramcache)
3534             idxp = &hdr->indices[i];
3535         else
3536 #endif
3537         {
3538             if (ecread(masterfd, &idx, 1, index_entry_ec, tc_stat.econ)
3539                 != sizeof(struct index_entry))
3540             {
3541                 logf("delete_entry(): read error #2");
3542                 goto cleanup;
3543             }
3544             idxp = &idx;
3545         }
3546
3547         if (idxp->flag & FLAG_DELETED)
3548             continue;
3549
3550         for (tag = 0; tag < TAG_COUNT; tag++)
3551         {
3552             if (TAGCACHE_IS_NUMERIC(tag))
3553                 continue;
3554
3555             if (idxp->tag_seek[tag] == myidx.tag_seek[tag])
3556                 in_use[tag]++;
3557         }
3558     }
3559
3560     /* Now delete all tags no longer in use. */
3561     for (tag = 0; tag < TAG_COUNT; tag++)
3562     {
3563         struct tagcache_header tch;
3564         int oldseek = myidx.tag_seek[tag];
3565
3566         if (TAGCACHE_IS_NUMERIC(tag))
3567             continue;
3568
3569         /**
3570          * Replace tag seek with a hash value of the field string data.
3571          * That way runtime statistics of moved or altered files can be
3572          * resurrected.
3573          */
3574 #ifdef HAVE_TC_RAMCACHE
3575         if (tc_stat.ramcache && tag != tag_filename)
3576         {
3577             struct tagfile_entry *tfe;
3578             int32_t *seek = &hdr->indices[idx_id].tag_seek[tag];
3579
3580             tfe = (struct tagfile_entry *)&hdr->tags[tag][*seek];
3581             *seek = crc_32(tfe->tag_data, strlen(tfe->tag_data), 0xffffffff);
3582             myidx.tag_seek[tag] = *seek;
3583         }
3584         else
3585 #endif
3586         {
3587             struct tagfile_entry tfe;
3588
3589             /* Open the index file, which contains the tag names. */
3590             if ((fd = open_tag_fd(&tch, tag, true)) < 0)
3591                 goto cleanup;
3592
3593             /* Skip the header block */
3594             lseek(fd, myidx.tag_seek[tag], SEEK_SET);
3595             if (ecread(fd, &tfe, 1, tagfile_entry_ec, tc_stat.econ)
3596                 != sizeof(struct tagfile_entry))
3597             {
3598                 logf("delete_entry(): read error #3");
3599                 goto cleanup;
3600             }
3601
3602             if (read(fd, buf, tfe.tag_length) != tfe.tag_length)
3603             {
3604                 logf("delete_entry(): read error #4");
3605                 goto cleanup;
3606             }
3607
3608             myidx.tag_seek[tag] = crc_32(buf, strlen(buf), 0xffffffff);
3609         }
3610
3611         if (in_use[tag])
3612         {
3613             logf("in use: %d/%d", tag, in_use[tag]);
3614             if (fd >= 0)
3615             {
3616                 close(fd);
3617                 fd = -1;
3618             }
3619             continue;
3620         }
3621
3622 #ifdef HAVE_TC_RAMCACHE
3623         /* Delete from ram. */
3624         if (tc_stat.ramcache && tag != tag_filename)
3625         {
3626             struct tagfile_entry *tagentry = (struct tagfile_entry *)&hdr->tags[tag][oldseek];
3627             tagentry->tag_data[0] = '\0';
3628         }
3629 #endif
3630
3631         /* Open the index file, which contains the tag names. */
3632         if (fd < 0)
3633         {
3634             if ((fd = open_tag_fd(&tch, tag, true)) < 0)
3635                 goto cleanup;
3636         }
3637
3638         /* Skip the header block */
3639         lseek(fd, oldseek + sizeof(struct tagfile_entry), SEEK_SET);
3640
3641         /* Debug, print 10 first characters of the tag
3642         read(fd, buf, 10);
3643         buf[10]='\0';
3644         logf("TAG:%s", buf);
3645         lseek(fd, -10, SEEK_CUR);
3646         */
3647
3648         /* Write first data byte in tag as \0 */
3649         write(fd, "", 1);
3650
3651         /* Now tag data has been removed */
3652         close(fd);
3653         fd = -1;
3654     }
3655
3656     /* Write index entry back into master index. */
3657     lseek(masterfd, sizeof(struct master_header) +
3658           (idx_id * sizeof(struct index_entry)), SEEK_SET);
3659     if (ecwrite(masterfd, &myidx, 1, index_entry_ec, tc_stat.econ)
3660         != sizeof(struct index_entry))
3661     {
3662         logf("delete_entry(): write_error #2");
3663         goto cleanup;
3664     }
3665
3666     close(masterfd);
3667
3668     return true;
3669
3670     cleanup:
3671     if (fd >= 0)
3672         close(fd);
3673     if (masterfd >= 0)
3674         close(masterfd);
3675
3676     return false;
3677 }
3678
3679 #ifndef __PCTOOL__
3680 /**
3681  * Returns true if there is an event waiting in the queue
3682  * that requires the current operation to be aborted.
3683  */
3684 static bool check_event_queue(void)
3685 {
3686     struct queue_event ev;
3687
3688     queue_wait_w_tmo(&tagcache_queue, &ev, 0);
3689     switch (ev.id)
3690     {
3691         case Q_STOP_SCAN:
3692         case SYS_POWEROFF:
3693         case SYS_USB_CONNECTED:
3694             /* Put the event back into the queue. */
3695             queue_post(&tagcache_queue, ev.id, ev.data);
3696             return true;
3697     }
3698
3699     return false;
3700 }
3701 #endif
3702
3703 #ifdef HAVE_TC_RAMCACHE
3704 static bool allocate_tagcache(void)
3705 {
3706     struct master_header tcmh;
3707     int fd;
3708
3709     /* Load the header. */
3710     if ( (fd = open_master_fd(&tcmh, false)) < 0)
3711     {
3712         hdr = NULL;
3713         return false;
3714     }
3715
3716     close(fd);
3717
3718     /**
3719      * Now calculate the required cache size plus
3720      * some extra space for alignment fixes.
3721      */
3722     tc_stat.ramcache_allocated = tcmh.tch.datasize + 128 + TAGCACHE_RESERVE +
3723         sizeof(struct ramcache_header) + TAG_COUNT*sizeof(void *);
3724     hdr = buffer_alloc(tc_stat.ramcache_allocated + 128);
3725     memset(hdr, 0, sizeof(struct ramcache_header));
3726     memcpy(&hdr->h, &tcmh, sizeof(struct master_header));
3727     hdr->indices = (struct index_entry *)(hdr + 1);
3728     logf("tagcache: %d bytes allocated.", tc_stat.ramcache_allocated);
3729
3730     return true;
3731 }
3732
3733 # ifdef HAVE_EEPROM_SETTINGS
3734 static bool tagcache_dumpload(void)
3735 {
3736     struct statefile_header shdr;
3737     int fd, rc;
3738     long offpos;
3739     int i;
3740
3741     fd = open(TAGCACHE_STATEFILE, O_RDONLY);
3742     if (fd < 0)
3743     {
3744         logf("no tagcache statedump");
3745         return false;
3746     }
3747
3748     /* Check the statefile memory placement */
3749     hdr = buffer_alloc(0);
3750     rc = read(fd, &shdr, sizeof(struct statefile_header));
3751     if (rc != sizeof(struct statefile_header)
3752         /* || (long)hdr != (long)shdr.hdr */)
3753     {
3754         logf("incorrect statefile");
3755         hdr = NULL;
3756         close(fd);
3757         return false;
3758     }
3759
3760     offpos = (long)hdr - (long)shdr.hdr;
3761
3762     /* Lets allocate real memory and load it */
3763     hdr = buffer_alloc(shdr.tc_stat.ramcache_allocated);
3764     rc = read(fd, hdr, shdr.tc_stat.ramcache_allocated);
3765     close(fd);
3766
3767     if (rc != shdr.tc_stat.ramcache_allocated)
3768     {
3769         logf("read failure!");
3770         hdr = NULL;
3771         return false;
3772     }
3773
3774     memcpy(&tc_stat, &shdr.tc_stat, sizeof(struct tagcache_stat));
3775
3776     /* Now fix the pointers */
3777     hdr->indices = (struct index_entry *)((long)hdr->indices + offpos);
3778     for (i = 0; i < TAG_COUNT; i++)
3779         hdr->tags[i] += offpos;
3780
3781     return true;
3782 }
3783
3784 static bool tagcache_dumpsave(void)
3785 {
3786     struct statefile_header shdr;
3787     int fd;
3788
3789     if (!tc_stat.ramcache)
3790         return false;
3791
3792     fd = open(TAGCACHE_STATEFILE, O_WRONLY | O_CREAT | O_TRUNC);
3793     if (fd < 0)
3794     {
3795         logf("failed to create a statedump");
3796         return false;
3797     }
3798
3799     /* Create the header */
3800     shdr.hdr = hdr;
3801     memcpy(&shdr.tc_stat, &tc_stat, sizeof(struct tagcache_stat));
3802     write(fd, &shdr, sizeof(struct statefile_header));
3803
3804     /* And dump the data too */
3805     write(fd, hdr, tc_stat.ramcache_allocated);
3806     close(fd);
3807
3808     return true;
3809 }
3810 # endif
3811
3812 static bool load_tagcache(void)
3813 {
3814     struct tagcache_header *tch;
3815     long bytesleft = tc_stat.ramcache_allocated;
3816     struct index_entry *idx;
3817     int rc, fd;
3818     char *p;
3819     int i, tag;
3820
3821 # ifdef HAVE_DIRCACHE
3822     while (dircache_is_initializing())
3823         sleep(1);
3824
3825     dircache_set_appflag(DIRCACHE_APPFLAG_TAGCACHE);
3826 # endif
3827
3828     logf("loading tagcache to ram...");
3829
3830     fd = open(TAGCACHE_FILE_MASTER, O_RDONLY);
3831     if (fd < 0)
3832     {
3833         logf("tagcache open failed");
3834         return false;
3835     }
3836
3837     if (ecread(fd, &hdr->h, 1, master_header_ec, tc_stat.econ)
3838         != sizeof(struct master_header)
3839         || hdr->h.tch.magic != TAGCACHE_MAGIC)
3840     {
3841         logf("incorrect header");
3842         return false;
3843     }
3844
3845     idx = hdr->indices;
3846
3847     /* Load the master index table. */
3848     for (i = 0; i < hdr->h.tch.entry_count; i++)
3849     {
3850         rc = ecread(fd, idx, 1, index_entry_ec, tc_stat.econ);
3851         if (rc != sizeof(struct index_entry))
3852         {
3853             logf("read error #10");
3854             close(fd);
3855             return false;
3856         }
3857
3858         bytesleft -= sizeof(struct index_entry);
3859         if (bytesleft < 0 || ((long)idx - (long)hdr->indices) >= tc_stat.ramcache_allocated)
3860         {
3861             logf("too big tagcache.");
3862             close(fd);
3863             return false;
3864         }
3865
3866         idx++;
3867     }
3868
3869     close(fd);
3870
3871     /* Load the tags. */
3872     p = (char *)idx;
3873     for (tag = 0; tag < TAG_COUNT; tag++)
3874     {
3875         struct tagfile_entry *fe;
3876         char buf[TAG_MAXLEN+32];
3877
3878         if (TAGCACHE_IS_NUMERIC(tag))
3879             continue ;
3880
3881         //p = ((void *)p+1);
3882         p = (char *)((long)p & ~0x03) + 0x04;
3883         hdr->tags[tag] = p;
3884
3885         /* Check the header. */
3886         tch = (struct tagcache_header *)p;
3887         p += sizeof(struct tagcache_header);
3888
3889         if ( (fd = open_tag_fd(tch, tag, false)) < 0)
3890             return false;
3891
3892         for (hdr->entry_count[tag] = 0;
3893              hdr->entry_count[tag] < tch->entry_count;
3894              hdr->entry_count[tag]++)
3895         {
3896             long pos;
3897
3898             if (do_timed_yield())
3899             {
3900                 /* Abort if we got a critical event in queue */
3901                 if (check_event_queue())
3902                     return false;
3903             }
3904
3905             fe = (struct tagfile_entry *)p;
3906             pos = lseek(fd, 0, SEEK_CUR);
3907             rc = ecread(fd, fe, 1, tagfile_entry_ec, tc_stat.econ);
3908             if (rc != sizeof(struct tagfile_entry))
3909             {
3910                 /* End of lookup table. */
3911                 logf("read error #11");
3912                 close(fd);
3913                 return false;
3914             }
3915
3916             /* We have a special handling for the filename tags. */
3917             if (tag == tag_filename)
3918             {
3919 # ifdef HAVE_DIRCACHE
3920                 const struct dirent *dc;
3921 # endif
3922
3923                 // FIXME: This is wrong!
3924                 // idx = &hdr->indices[hdr->entry_count[i]];
3925                 idx = &hdr->indices[fe->idx_id];
3926
3927                 if (fe->tag_length >= (long)sizeof(buf)-1)
3928                 {
3929                     read(fd, buf, 10);
3930                     buf[10] = '\0';
3931                     logf("TAG:%s", buf);
3932                     logf("too long filename");
3933                     close(fd);
3934                     return false;
3935                 }
3936
3937                 rc = read(fd, buf, fe->tag_length);
3938                 if (rc != fe->tag_length)
3939                 {
3940                     logf("read error #12");
3941                     close(fd);
3942                     return false;
3943                 }
3944
3945                 /* Check if the entry has already been removed */
3946                 if (idx->flag & FLAG_DELETED)
3947                     continue;
3948
3949                 /* This flag must not be used yet. */
3950                 if (idx->flag & FLAG_DIRCACHE)
3951                 {
3952                     logf("internal error!");
3953                     close(fd);
3954                     return false;
3955                 }
3956
3957                 if (idx->tag_seek[tag] != pos)
3958                 {
3959                     logf("corrupt data structures!");
3960                     close(fd);
3961                     return false;
3962                 }
3963
3964 # ifdef HAVE_DIRCACHE
3965                 if (dircache_is_enabled())
3966                 {
3967                     dc = dircache_get_entry_ptr(buf);
3968                     if (dc == NULL)
3969                     {
3970                         logf("Entry no longer valid.");
3971                         logf("-> %s", buf);
3972                         delete_entry(fe->idx_id);
3973                         continue ;
3974                     }
3975
3976                     idx->flag |= FLAG_DIRCACHE;
3977                     idx->tag_seek[tag_filename] = (long)dc;
3978                 }
3979                 else
3980 # endif
3981                 {
3982                     /* This will be very slow unless dircache is enabled
3983                        or target is flash based, but do it anyway for
3984                        consistency. */
3985                     /* Check if entry has been removed. */
3986                     if (global_settings.tagcache_autoupdate)
3987                     {
3988                         if (!file_exists(buf))
3989                         {
3990                             logf("Entry no longer valid.");
3991                             logf("-> %s", buf);
3992                             delete_entry(fe->idx_id);
3993                             continue;
3994                         }
3995                     }
3996                 }
3997
3998                 continue ;
3999             }
4000
4001             bytesleft -= sizeof(struct tagfile_entry) + fe->tag_length;
4002             if (bytesleft < 0)
4003             {
4004                 logf("too big tagcache #2");
4005                 logf("tl: %d", fe->tag_length);
4006                 logf("bl: %ld", bytesleft);
4007                 close(fd);
4008                 return false;
4009             }
4010
4011             p = fe->tag_data;
4012             rc = read(fd, fe->tag_data, fe->tag_length);
4013             p += rc;
4014
4015             if (rc != fe->tag_length)
4016             {
4017                 logf("read error #13");
4018                 logf("rc=0x%04x", rc); // 0x431
4019                 logf("len=0x%04x", fe->tag_length); // 0x4000
4020                 logf("pos=0x%04lx", lseek(fd, 0, SEEK_CUR)); // 0x433
4021                 logf("tag=0x%02x", tag); // 0x00
4022                 close(fd);
4023                 return false;
4024             }
4025         }
4026         close(fd);
4027     }
4028
4029     tc_stat.ramcache_used = tc_stat.ramcache_allocated - bytesleft;
4030     logf("tagcache loaded into ram!");
4031
4032     return true;
4033 }
4034 #endif /* HAVE_TC_RAMCACHE */
4035
4036 static bool check_deleted_files(void)
4037 {
4038     int fd;
4039     char buf[TAG_MAXLEN+32];
4040     struct tagfile_entry tfe;
4041
4042     logf("reverse scan...");
4043     snprintf(buf, sizeof buf, TAGCACHE_FILE_INDEX, tag_filename);
4044     fd = open(buf, O_RDONLY);
4045
4046     if (fd < 0)
4047     {
4048         logf("%s open fail", buf);
4049         return false;
4050     }
4051
4052     lseek(fd, sizeof(struct tagcache_header), SEEK_SET);
4053     while (ecread(fd, &tfe, 1, tagfile_entry_ec, tc_stat.econ)
4054            == sizeof(struct tagfile_entry)
4055 #ifndef __PCTOOL__
4056            && !check_event_queue()
4057 #endif
4058            )
4059     {
4060         if (tfe.tag_length >= (long)sizeof(buf)-1)
4061         {
4062             logf("too long tag");
4063             close(fd);
4064             return false;
4065         }
4066
4067         if (read(fd, buf, tfe.tag_length) != tfe.tag_length)
4068         {
4069             logf("read error #14");
4070             close(fd);
4071             return false;
4072         }
4073
4074         /* Check if the file has already deleted from the db. */
4075         if (*buf == '\0')
4076             continue;
4077
4078         /* Now check if the file exists. */
4079         if (!file_exists(buf))
4080         {
4081             logf("Entry no longer valid.");
4082             logf("-> %s / %d", buf, tfe.tag_length);
4083             delete_entry(tfe.idx_id);
4084         }
4085     }
4086
4087     close(fd);
4088
4089     logf("done");
4090
4091     return true;
4092 }
4093
4094 static bool check_dir(const char *dirname, int add_files)
4095 {
4096     DIR *dir;
4097     int len;
4098     int success = false;
4099     int ignore, unignore;
4100     char newpath[MAX_PATH];
4101
4102     dir = opendir(dirname);
4103     if (!dir)
4104     {
4105         logf("tagcache: opendir() failed");
4106         return false;
4107     }
4108
4109     /* check for a database.ignore file */
4110     snprintf(newpath, MAX_PATH, "%s/database.ignore", dirname);
4111     ignore = file_exists(newpath);
4112     /* check for a database.unignore file */
4113     snprintf(newpath, MAX_PATH, "%s/database.unignore", dirname);
4114     unignore = file_exists(newpath);
4115
4116     /* don't do anything if both ignore and unignore are there */
4117     if (ignore != unignore)
4118         add_files = unignore;
4119
4120     /* Recursively scan the dir. */
4121 #ifdef __PCTOOL__
4122     while (1)
4123 #else
4124     while (!check_event_queue())
4125 #endif
4126     {
4127         struct dirent *entry;
4128
4129         entry = readdir(dir);
4130
4131         if (entry == NULL)
4132         {
4133             success = true;
4134             break ;
4135         }
4136
4137         if (!strcmp((char *)entry->d_name, ".") ||
4138             !strcmp((char *)entry->d_name, ".."))
4139             continue;
4140
4141         yield();
4142
4143         len = strlen(curpath);
4144         snprintf(&curpath[len], sizeof(curpath) - len, "/%s",
4145                  entry->d_name);
4146
4147         processed_dir_count++;
4148         if (entry->attribute & ATTR_DIRECTORY)
4149             check_dir(curpath, add_files);
4150         else if (add_files)
4151         {
4152             tc_stat.curentry = curpath;
4153
4154             /* Add a new entry to the temporary db file. */
4155             add_tagcache(curpath, (entry->wrtdate << 16) | entry->wrttime
4156 #if defined(HAVE_TC_RAMCACHE) && defined(HAVE_DIRCACHE)
4157                          , dir->internal_entry
4158 #endif
4159                          );
4160
4161             /* Wait until current path for debug screen is read and unset. */
4162             while (tc_stat.syncscreen && tc_stat.curentry != NULL)
4163                 yield();
4164
4165             tc_stat.curentry = NULL;
4166         }
4167
4168         curpath[len] = '\0';
4169     }
4170
4171     closedir(dir);
4172
4173     return success;
4174 }
4175
4176 void tagcache_screensync_event(void)
4177 {
4178     tc_stat.curentry = NULL;
4179 }
4180
4181 void tagcache_screensync_enable(bool state)
4182 {
4183     tc_stat.syncscreen = state;
4184 }
4185
4186 void tagcache_build(const char *path)
4187 {
4188     struct tagcache_header header;
4189     bool ret;
4190
4191     curpath[0] = '\0';
4192     data_size = 0;
4193     total_entry_count = 0;
4194     processed_dir_count = 0;
4195
4196 #ifdef HAVE_DIRCACHE
4197     while (dircache_is_initializing())
4198         sleep(1);
4199 #endif
4200
4201     logf("updating tagcache");
4202
4203     cachefd = open(TAGCACHE_FILE_TEMP, O_RDONLY);
4204     if (cachefd >= 0)
4205     {
4206         logf("skipping, cache already waiting for commit");
4207         close(cachefd);
4208         return ;
4209     }
4210
4211     cachefd = open(TAGCACHE_FILE_TEMP, O_RDWR | O_CREAT | O_TRUNC);
4212     if (cachefd < 0)
4213     {
4214         logf("master file open failed: %s", TAGCACHE_FILE_TEMP);
4215         return ;
4216     }
4217
4218     filenametag_fd = open_tag_fd(&header, tag_filename, false);
4219
4220     cpu_boost(true);
4221
4222     logf("Scanning files...");
4223     /* Scan for new files. */
4224     memset(&header, 0, sizeof(struct tagcache_header));
4225     write(cachefd, &header, sizeof(struct tagcache_header));
4226
4227     if (strcmp("/", path) != 0)
4228         strcpy(curpath, path);
4229     ret = check_dir(path, true);
4230
4231     /* Write the header. */
4232     header.magic = TAGCACHE_MAGIC;
4233     header.datasize = data_size;
4234     header.entry_count = total_entry_count;
4235     lseek(cachefd, 0, SEEK_SET);
4236     write(cachefd, &header, sizeof(struct tagcache_header));
4237     close(cachefd);
4238
4239     if (filenametag_fd >= 0)
4240     {
4241         close(filenametag_fd);
4242         filenametag_fd = -1;
4243     }
4244
4245     if (!ret)
4246     {
4247         logf("Aborted.");
4248         cpu_boost(false);
4249         return ;
4250     }
4251
4252     /* Commit changes to the database. */
4253 #ifdef __PCTOOL__
4254     allocate_tempbuf();
4255 #endif
4256     if (commit())
4257     {
4258         remove(TAGCACHE_FILE_TEMP);
4259         logf("tagcache built!");
4260     }
4261 #ifdef __PCTOOL__
4262     free_tempbuf();
4263 #endif
4264
4265 #ifdef HAVE_TC_RAMCACHE
4266     if (hdr)
4267     {
4268         /* Import runtime statistics if we just initialized the db. */
4269         if (hdr->h.serial == 0)
4270             queue_post(&tagcache_queue, Q_IMPORT_CHANGELOG, 0);
4271     }
4272 #endif
4273
4274     cpu_boost(false);
4275 }
4276
4277 #ifdef HAVE_TC_RAMCACHE
4278 static void load_ramcache(void)
4279 {
4280     if (!hdr)
4281         return ;
4282
4283     cpu_boost(true);
4284
4285     /* At first we should load the cache (if exists). */
4286     tc_stat.ramcache = load_tagcache();
4287
4288     if (!tc_stat.ramcache)
4289     {
4290         /* If loading failed, it must indicate some problem with the db
4291          * so disable it entirely to prevent further issues. */
4292         tc_stat.ready = false;
4293         hdr = NULL;
4294     }
4295
4296     cpu_boost(false);
4297 }
4298
4299 void tagcache_unload_ramcache(void)
4300 {
4301     tc_stat.ramcache = false;
4302     /* Just to make sure there is no statefile present. */
4303     // remove(TAGCACHE_STATEFILE);
4304 }
4305 #endif
4306
4307 #ifndef __PCTOOL__
4308 static void tagcache_thread(void)
4309 {
4310     struct queue_event ev;
4311     bool check_done = false;
4312
4313     /* If the previous cache build/update was interrupted, commit
4314      * the changes first in foreground. */
4315     cpu_boost(true);
4316     allocate_tempbuf();
4317     commit();
4318     free_tempbuf();
4319
4320 #ifdef HAVE_TC_RAMCACHE
4321 # ifdef HAVE_EEPROM_SETTINGS
4322     if (firmware_settings.initialized && firmware_settings.disk_clean)
4323         check_done = tagcache_dumpload();
4324
4325     remove(TAGCACHE_STATEFILE);
4326 # endif
4327
4328     /* Allocate space for the tagcache if found on disk. */
4329     if (global_settings.tagcache_ram && !tc_stat.ramcache)
4330         allocate_tagcache();
4331 #endif
4332
4333     cpu_boost(false);
4334     tc_stat.initialized = true;
4335
4336     /* Don't delay bootup with the header check but do it on background. */
4337     sleep(HZ);
4338     tc_stat.ready = check_all_headers();
4339     tc_stat.readyvalid = true;
4340
4341     while (1)
4342     {
4343         run_command_queue(false);
4344
4345         queue_wait_w_tmo(&tagcache_queue, &ev, HZ);
4346
4347         switch (ev.id)
4348         {
4349             case Q_IMPORT_CHANGELOG:
4350                 tagcache_import_changelog();
4351                 break;
4352
4353             case Q_REBUILD:
4354                 remove_files();
4355                 remove(TAGCACHE_FILE_TEMP);
4356                 tagcache_build("/");
4357                 break;
4358
4359             case Q_UPDATE:
4360                 tagcache_build("/");
4361 #ifdef HAVE_TC_RAMCACHE
4362                 load_ramcache();
4363 #endif
4364                 check_deleted_files();
4365                 break ;
4366
4367             case Q_START_SCAN:
4368                 check_done = false;
4369             case SYS_TIMEOUT:
4370                 if (check_done || !tc_stat.ready)
4371                     break ;
4372
4373 #ifdef HAVE_TC_RAMCACHE
4374                 if (!tc_stat.ramcache && global_settings.tagcache_ram)
4375                 {
4376                     load_ramcache();
4377                     if (tc_stat.ramcache && global_settings.tagcache_autoupdate)
4378                         tagcache_build("/");
4379                 }
4380                 else
4381 #endif
4382                 if (global_settings.tagcache_autoupdate)
4383                 {
4384                     tagcache_build("/");
4385
4386                     /* This will be very slow unless dircache is enabled
4387                        or target is flash based, but do it anyway for
4388                        consistency. */
4389                     check_deleted_files();
4390                 }
4391
4392                 logf("tagcache check done");
4393
4394                 check_done = true;
4395                 break ;
4396
4397             case Q_STOP_SCAN:
4398                 break ;
4399
4400             case SYS_POWEROFF:
4401                 break ;
4402
4403 #ifndef SIMULATOR
4404             case SYS_USB_CONNECTED:
4405                 logf("USB: TagCache");
4406                 usb_acknowledge(SYS_USB_CONNECTED_ACK);
4407                 usb_wait_for_disconnect(&tagcache_queue);
4408                 break ;
4409 #endif
4410         }
4411     }
4412 }
4413
4414 bool tagcache_prepare_shutdown(void)
4415 {
4416     if (tagcache_get_commit_step() > 0)
4417         return false;
4418
4419     tagcache_stop_scan();
4420     while (read_lock || write_lock)
4421         sleep(1);
4422
4423     return true;
4424 }
4425
4426 void tagcache_shutdown(void)
4427 {
4428     /* Flush the command queue. */
4429     run_command_queue(true);
4430
4431 #ifdef HAVE_EEPROM_SETTINGS
4432     if (tc_stat.ramcache)
4433         tagcache_dumpsave();
4434 #endif
4435 }
4436
4437 static int get_progress(void)
4438 {
4439     int total_count = -1;
4440
4441 #ifdef HAVE_DIRCACHE
4442     if (dircache_is_enabled())
4443     {
4444         total_count = dircache_get_entry_count();
4445     }
4446     else
4447 #endif
4448 #ifdef HAVE_TC_RAMCACHE
4449     {
4450         if (hdr && tc_stat.ramcache)
4451             total_count = hdr->h.tch.entry_count;
4452     }
4453 #endif
4454
4455     if (total_count < 0)
4456         return -1;
4457
4458     return processed_dir_count * 100 / total_count;
4459 }
4460
4461 struct tagcache_stat* tagcache_get_stat(void)
4462 {
4463     tc_stat.progress = get_progress();
4464     tc_stat.processed_entries = processed_dir_count;
4465
4466     return &tc_stat;
4467 }
4468
4469 void tagcache_start_scan(void)
4470 {
4471     queue_post(&tagcache_queue, Q_START_SCAN, 0);
4472 }
4473
4474 bool tagcache_update(void)
4475 {
4476     if (!tc_stat.ready)
4477         return false;
4478
4479     queue_post(&tagcache_queue, Q_UPDATE, 0);
4480     return false;
4481 }
4482
4483 bool tagcache_rebuild()
4484 {
4485     queue_post(&tagcache_queue, Q_REBUILD, 0);
4486     return false;
4487 }
4488
4489 void tagcache_stop_scan(void)
4490 {
4491     queue_post(&tagcache_queue, Q_STOP_SCAN, 0);
4492 }
4493
4494 #ifdef HAVE_TC_RAMCACHE
4495 bool tagcache_is_ramcache(void)
4496 {
4497     return tc_stat.ramcache;
4498 }
4499 #endif
4500
4501 #endif /* !__PCTOOL__ */
4502
4503
4504 void tagcache_init(void)
4505 {
4506     memset(&tc_stat, 0, sizeof(struct tagcache_stat));
4507     memset(&current_tcmh, 0, sizeof(struct master_header));
4508     filenametag_fd = -1;
4509     write_lock = read_lock = 0;
4510
4511 #ifndef __PCTOOL__
4512     mutex_init(&command_queue_mutex);
4513     queue_init(&tagcache_queue, true);
4514     create_thread(tagcache_thread, tagcache_stack,
4515                   sizeof(tagcache_stack), 0, tagcache_thread_name
4516                   IF_PRIO(, PRIORITY_BACKGROUND)
4517                           IF_COP(, CPU));
4518 #else
4519     tc_stat.initialized = true;
4520     allocate_tempbuf();
4521     commit();
4522     free_tempbuf();
4523     tc_stat.ready = check_all_headers();
4524 #endif
4525 }
4526
4527 #ifdef __PCTOOL__
4528 void tagcache_reverse_scan(void)
4529 {
4530     logf("Checking for deleted files");
4531     check_deleted_files();
4532 }
4533 #endif
4534
4535 bool tagcache_is_initialized(void)
4536 {
4537     return tc_stat.initialized;
4538 }
4539 bool tagcache_is_usable(void)
4540 {
4541     return tc_stat.initialized && tc_stat.ready;
4542 }
4543 int tagcache_get_commit_step(void)
4544 {
4545     return tc_stat.commit_step;
4546 }
4547 int tagcache_get_max_commit_step(void)
4548 {
4549     return (int)(SORTED_TAGS_COUNT)+1;
4550 }
4551