source: trunk/libtransmission/torrent.c @ 9494

Last change on this file since 9494 was 9494, checked in by charles, 13 years ago

(trunk libT) #2548: T's request queue can send out too many duplicate requests

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1/*
2 * This file Copyright (C) 2009 Charles Kerr <charles@transmissionbt.com>
3 *
4 * This file is licensed by the GPL version 2.  Works owned by the
5 * Transmission project are granted a special exemption to clause 2(b)
6 * so that the bulk of its code can remain under the MIT license.
7 * This exemption does not extend to derived works not owned by
8 * the Transmission project.
9 *
10 * $Id: torrent.c 9494 2009-11-08 23:20:00Z charles $
11 */
12
13#include <sys/types.h> /* stat */
14#include <sys/stat.h> /* stat */
15#include <unistd.h> /* stat */
16#include <dirent.h>
17
18#include <assert.h>
19#include <limits.h> /* INT_MAX */
20#include <math.h> /* fabs */
21#include <stdarg.h>
22#include <string.h> /* memcmp */
23#include <stdlib.h> /* qsort */
24
25#include <event.h> /* evbuffer */
26
27#include "transmission.h"
28#include "announcer.h"
29#include "bandwidth.h"
30#include "bencode.h"
31#include "completion.h"
32#include "crypto.h" /* for tr_sha1 */
33#include "resume.h"
34#include "fdlimit.h" /* tr_fdTorrentClose */
35#include "metainfo.h"
36#include "peer-mgr.h"
37#include "platform.h" /* TR_PATH_DELIMITER_STR */
38#include "ptrarray.h"
39#include "ratecontrol.h"
40#include "session.h"
41#include "torrent.h"
42#include "trevent.h"
43#include "utils.h"
44#include "verify.h"
45
46#define MAX_BLOCK_SIZE ( 1024 * 16 )
47
48/***
49****
50***/
51
52int
53tr_torrentId( const tr_torrent * tor )
54{
55    return tor->uniqueId;
56}
57
58tr_torrent*
59tr_torrentFindFromId( tr_session * session, int id )
60{
61    tr_torrent * tor = NULL;
62
63    while(( tor = tr_torrentNext( session, tor )))
64        if( tor->uniqueId == id )
65            return tor;
66
67    return NULL;
68}
69
70tr_torrent*
71tr_torrentFindFromHashString( tr_session *  session, const char * str )
72{
73    tr_torrent * tor = NULL;
74
75    while(( tor = tr_torrentNext( session, tor )))
76        if( !strcmp( str, tor->info.hashString ) )
77            return tor;
78
79    return NULL;
80}
81
82tr_torrent*
83tr_torrentFindFromHash( tr_session * session, const uint8_t * torrentHash )
84{
85    tr_torrent * tor = NULL;
86
87    while(( tor = tr_torrentNext( session, tor )))
88        if( *tor->info.hash == *torrentHash )
89            if( !memcmp( tor->info.hash, torrentHash, SHA_DIGEST_LENGTH ) )
90                return tor;
91
92    return NULL;
93}
94
95tr_torrent*
96tr_torrentFindFromObfuscatedHash( tr_session * session,
97                                  const uint8_t * obfuscatedTorrentHash )
98{
99    tr_torrent * tor = NULL;
100
101    while(( tor = tr_torrentNext( session, tor )))
102        if( !memcmp( tor->obfuscatedHash, obfuscatedTorrentHash,
103                     SHA_DIGEST_LENGTH ) )
104            return tor;
105
106    return NULL;
107}
108
109/***
110****  PER-TORRENT UL / DL SPEEDS
111***/
112
113void
114tr_torrentSetSpeedLimit( tr_torrent * tor, tr_direction dir, int KiB_sec )
115{
116    assert( tr_isTorrent( tor ) );
117    assert( tr_isDirection( dir ) );
118
119    if( tr_bandwidthSetDesiredSpeed( tor->bandwidth, dir, KiB_sec ) )
120        tr_torrentSetDirty( tor );
121}
122
123int
124tr_torrentGetSpeedLimit( const tr_torrent * tor, tr_direction dir )
125{
126    assert( tr_isTorrent( tor ) );
127    assert( tr_isDirection( dir ) );
128
129    return tr_bandwidthGetDesiredSpeed( tor->bandwidth, dir );
130}
131
132void
133tr_torrentUseSpeedLimit( tr_torrent * tor, tr_direction dir, tr_bool do_use )
134{
135    assert( tr_isTorrent( tor ) );
136    assert( tr_isDirection( dir ) );
137
138    if( tr_bandwidthSetLimited( tor->bandwidth, dir, do_use ) )
139        tr_torrentSetDirty( tor );
140}
141
142tr_bool
143tr_torrentUsesSpeedLimit( const tr_torrent * tor, tr_direction dir )
144{
145    assert( tr_isTorrent( tor ) );
146    assert( tr_isDirection( dir ) );
147
148    return tr_bandwidthIsLimited( tor->bandwidth, dir );
149}
150
151void
152tr_torrentUseSessionLimits( tr_torrent * tor, tr_bool doUse )
153{
154    tr_bool changed;
155
156    assert( tr_isTorrent( tor ) );
157
158    changed = tr_bandwidthHonorParentLimits( tor->bandwidth, TR_UP, doUse );
159    changed |= tr_bandwidthHonorParentLimits( tor->bandwidth, TR_DOWN, doUse );
160
161    if( changed )
162        tr_torrentSetDirty( tor );
163}
164
165tr_bool
166tr_torrentUsesSessionLimits( const tr_torrent * tor )
167{
168    assert( tr_isTorrent( tor ) );
169
170    return tr_bandwidthAreParentLimitsHonored( tor->bandwidth, TR_UP );
171}
172
173/***
174****
175***/
176
177void
178tr_torrentSetRatioMode( tr_torrent *  tor, tr_ratiolimit mode )
179{
180    assert( tr_isTorrent( tor ) );
181    assert( mode==TR_RATIOLIMIT_GLOBAL || mode==TR_RATIOLIMIT_SINGLE || mode==TR_RATIOLIMIT_UNLIMITED  );
182
183    if( mode != tor->ratioLimitMode )
184    {
185        tor->ratioLimitMode = mode;
186        tor->needsSeedRatioCheck = TRUE;
187
188        tr_torrentSetDirty( tor );
189    }
190}
191
192tr_ratiolimit
193tr_torrentGetRatioMode( const tr_torrent * tor )
194{
195    assert( tr_isTorrent( tor ) );
196
197    return tor->ratioLimitMode;
198}
199
200void
201tr_torrentSetRatioLimit( tr_torrent * tor, double desiredRatio )
202{
203    assert( tr_isTorrent( tor ) );
204
205    if( (int)(desiredRatio*100.0) != (int)(tor->desiredRatio*100.0) )
206    {
207        tor->desiredRatio = desiredRatio;
208
209        tor->needsSeedRatioCheck = TRUE;
210
211        tr_torrentSetDirty( tor );
212    }
213}
214
215double
216tr_torrentGetRatioLimit( const tr_torrent * tor )
217{
218    assert( tr_isTorrent( tor ) );
219
220    return tor->desiredRatio;
221}
222
223tr_bool
224tr_torrentIsPieceTransferAllowed( const tr_torrent  * tor,
225                                  tr_direction        direction )
226{
227    int limit;
228    tr_bool allowed = TRUE;
229
230    if( tr_torrentUsesSpeedLimit( tor, direction ) )
231        if( tr_torrentGetSpeedLimit( tor, direction ) <= 0 )
232            allowed = FALSE;
233
234    if( tr_torrentUsesSessionLimits( tor ) )
235        if( tr_sessionGetActiveSpeedLimit( tor->session, direction, &limit ) )
236            if( limit <= 0 )
237                allowed = FALSE;
238
239    return allowed;
240}
241
242tr_bool
243tr_torrentGetSeedRatio( const tr_torrent * tor, double * ratio )
244{
245    tr_bool isLimited;
246
247    switch( tr_torrentGetRatioMode( tor ) )
248    {
249        case TR_RATIOLIMIT_SINGLE:
250            isLimited = TRUE;
251            if( ratio )
252                *ratio = tr_torrentGetRatioLimit( tor );
253            break;
254
255        case TR_RATIOLIMIT_GLOBAL:
256            isLimited = tr_sessionIsRatioLimited( tor->session );
257            if( isLimited && ratio )
258                *ratio = tr_sessionGetRatioLimit( tor->session );
259            break;
260
261        default: /* TR_RATIOLIMIT_UNLIMITED */
262            isLimited = FALSE;
263            break;
264    }
265
266    return isLimited;
267}
268
269/***
270****
271***/
272
273void
274tr_torrentSetLocalError( tr_torrent * tor, const char * fmt, ... )
275{
276    va_list ap;
277
278    assert( tr_isTorrent( tor ) );
279
280    va_start( ap, fmt );
281    tor->error = TR_STAT_LOCAL_ERROR;
282    evutil_vsnprintf( tor->errorString, sizeof( tor->errorString ), fmt, ap );
283    va_end( ap );
284}
285
286static void
287onTrackerResponse( void * tracker UNUSED,
288                   void * vevent,
289                   void * user_data )
290{
291    tr_torrent *       tor = user_data;
292    tr_tracker_event * event = vevent;
293
294    switch( event->messageType )
295    {
296        case TR_TRACKER_PEERS:
297        {
298            size_t   i, n;
299            tr_pex * pex = tr_peerMgrArrayToPex( event->compact,
300                                                 event->compactLen, &n );
301             if( event->allAreSeeds )
302                tr_tordbg( tor, "Got %d seeds from tracker", (int)n );
303            else
304                tr_torinf( tor, _( "Got %d peers from tracker" ), (int)n );
305
306            for( i = 0; i < n; ++i )
307            {
308                if( event->allAreSeeds )
309                    pex[i].flags |= ADDED_F_SEED_FLAG;
310                tr_peerMgrAddPex( tor, TR_PEER_FROM_TRACKER, pex + i );
311            }
312
313            tr_free( pex );
314            break;
315        }
316
317        case TR_TRACKER_WARNING:
318            tr_torerr( tor, _( "Tracker warning: \"%s\"" ), event->text );
319            tor->error = TR_STAT_TRACKER_WARNING;
320            tr_strlcpy( tor->errorString, event->text, sizeof( tor->errorString ) );
321            break;
322
323        case TR_TRACKER_ERROR:
324            tr_torerr( tor, _( "Tracker error: \"%s\"" ), event->text );
325            tor->error = TR_STAT_TRACKER_ERROR;
326            tr_strlcpy( tor->errorString, event->text, sizeof( tor->errorString ) );
327            break;
328
329        case TR_TRACKER_ERROR_CLEAR:
330            tor->error = TR_STAT_OK;
331            tor->errorString[0] = '\0';
332            break;
333    }
334}
335
336/***
337****
338****  TORRENT INSTANTIATION
339****
340***/
341
342static int
343getBytePiece( const tr_info * info,
344              uint64_t        byteOffset )
345{
346    assert( info );
347    assert( info->pieceSize != 0 );
348
349    return byteOffset / info->pieceSize;
350}
351
352static void
353initFilePieces( tr_info *       info,
354                tr_file_index_t fileIndex )
355{
356    tr_file * file;
357    uint64_t  firstByte, lastByte;
358
359    assert( info );
360    assert( fileIndex < info->fileCount );
361
362    file = &info->files[fileIndex];
363    firstByte = file->offset;
364    lastByte = firstByte + ( file->length ? file->length - 1 : 0 );
365    file->firstPiece = getBytePiece( info, firstByte );
366    file->lastPiece = getBytePiece( info, lastByte );
367}
368
369static int
370pieceHasFile( tr_piece_index_t piece,
371              const tr_file *  file )
372{
373    return ( file->firstPiece <= piece ) && ( piece <= file->lastPiece );
374}
375
376static tr_priority_t
377calculatePiecePriority( const tr_torrent * tor,
378                        tr_piece_index_t   piece,
379                        int                fileHint )
380{
381    tr_file_index_t i;
382    int             priority = TR_PRI_LOW;
383
384    /* find the first file that has data in this piece */
385    if( fileHint >= 0 ) {
386        i = fileHint;
387        while( i > 0 && pieceHasFile( piece, &tor->info.files[i - 1] ) )
388            --i;
389    } else {
390        for( i = 0; i < tor->info.fileCount; ++i )
391            if( pieceHasFile( piece, &tor->info.files[i] ) )
392                break;
393    }
394
395    /* the piece's priority is the max of the priorities
396     * of all the files in that piece */
397    for( ; i < tor->info.fileCount; ++i )
398    {
399        const tr_file * file = &tor->info.files[i];
400
401        if( !pieceHasFile( piece, file ) )
402            break;
403
404        priority = MAX( priority, file->priority );
405
406        /* when dealing with multimedia files, getting the first and
407           last pieces can sometimes allow you to preview it a bit
408           before it's fully downloaded... */
409        if( file->priority >= TR_PRI_NORMAL )
410            if( file->firstPiece == piece || file->lastPiece == piece )
411                priority = TR_PRI_HIGH;
412    }
413
414    return priority;
415}
416
417static void
418tr_torrentInitFilePieces( tr_torrent * tor )
419{
420    tr_file_index_t  f;
421    tr_piece_index_t p;
422    uint64_t offset = 0;
423    tr_info * inf = &tor->info;
424    int * firstFiles;
425
426    /* assign the file offsets */
427    for( f=0; f<inf->fileCount; ++f ) {
428        inf->files[f].offset = offset;
429        offset += inf->files[f].length;
430        initFilePieces( inf, f );
431    }
432
433    /* build the array of first-file hints to give calculatePiecePriority */
434    firstFiles = tr_new( int, inf->pieceCount );
435    for( p=f=0; p<inf->pieceCount; ++p ) {
436        while( inf->files[f].lastPiece < p )
437            ++f;
438        firstFiles[p] = f;
439    }
440
441#if 0
442    /* test to confirm the first-file hints are correct */
443    for( p=0; p<inf->pieceCount; ++p ) {
444        f = firstFiles[p];
445        assert( inf->files[f].firstPiece <= p );
446        assert( inf->files[f].lastPiece >= p );
447        if( f > 0 )
448            assert( inf->files[f-1].lastPiece < p );
449        for( f=0; f<inf->fileCount; ++f )
450            if( pieceHasFile( p, &inf->files[f] ) )
451                break;
452        assert( (int)f == firstFiles[p] );
453    }
454#endif
455
456    for( p=0; p<inf->pieceCount; ++p )
457        inf->pieces[p].priority = calculatePiecePriority( tor, p, firstFiles[p] );
458
459    tr_free( firstFiles );
460}
461
462int
463tr_torrentPromoteTracker( tr_torrent * tor,
464                          int          pos )
465{
466    int i;
467    int tier;
468
469    assert( tor );
470    assert( ( 0 <= pos ) && ( pos < tor->info.trackerCount ) );
471
472    /* the tier of the tracker we're promoting */
473    tier = tor->info.trackers[pos].tier;
474
475    /* find the index of that tier's first tracker */
476    for( i = 0; i < tor->info.trackerCount; ++i )
477        if( tor->info.trackers[i].tier == tier )
478            break;
479
480    assert( i < tor->info.trackerCount );
481
482    /* promote the tracker at `pos' to the front of the tier */
483    if( i != pos )
484    {
485        const tr_tracker_info tmp = tor->info.trackers[i];
486        tor->info.trackers[i] = tor->info.trackers[pos];
487        tor->info.trackers[pos] = tmp;
488    }
489
490    /* return the new position of the tracker that started out at [pos] */
491    return i;
492}
493
494struct RandomTracker
495{
496    tr_tracker_info    tracker;
497    int                random_value;
498};
499
500/* the tiers will be sorted from lowest to highest,
501 * and trackers are randomized within the tiers */
502static TR_INLINE int
503compareRandomTracker( const void * va,
504                      const void * vb )
505{
506    const struct RandomTracker * a = va;
507    const struct RandomTracker * b = vb;
508
509    if( a->tracker.tier != b->tracker.tier )
510        return a->tracker.tier - b->tracker.tier;
511
512    return a->random_value - b->random_value;
513}
514
515static void
516randomizeTiers( tr_info * info )
517{
518    int                    i;
519    const int              n = info->trackerCount;
520    struct RandomTracker * r = tr_new0( struct RandomTracker, n );
521
522    for( i = 0; i < n; ++i )
523    {
524        r[i].tracker = info->trackers[i];
525        r[i].random_value = tr_cryptoRandInt( INT_MAX );
526    }
527    qsort( r, n, sizeof( struct RandomTracker ), compareRandomTracker );
528    for( i = 0; i < n; ++i )
529        info->trackers[i] = r[i].tracker;
530    tr_free( r );
531}
532
533static void torrentStart( tr_torrent * tor );
534
535/**
536 * Decide on a block size.  constraints:
537 * (1) most clients decline requests over 16 KiB
538 * (2) pieceSize must be a multiple of block size
539 */
540static uint32_t
541getBlockSize( uint32_t pieceSize )
542{
543    uint32_t b = pieceSize;
544
545    while( b > MAX_BLOCK_SIZE )
546        b /= 2u;
547
548    if( !b || ( pieceSize % b ) ) /* not cleanly divisible */
549        return 0;
550    return b;
551}
552
553static void refreshCurrentDir( tr_torrent * tor );;
554
555static void
556torrentRealInit( tr_torrent * tor, const tr_ctor * ctor )
557{
558    int          doStart;
559    uint64_t     loaded;
560    uint64_t     t;
561    const char * dir;
562    static int   nextUniqueId = 1;
563    tr_info    * info = &tor->info;
564    tr_session * session = tr_ctorGetSession( ctor );
565
566    assert( session != NULL );
567
568    tr_globalLock( session );
569
570    tor->session   = session;
571    tor->uniqueId = nextUniqueId++;
572    tor->magicNumber = TORRENT_MAGIC_NUMBER;
573
574    randomizeTiers( info );
575
576    tor->bandwidth = tr_bandwidthNew( session, session->bandwidth );
577
578    tor->blockSize = getBlockSize( info->pieceSize );
579
580    if( !tr_ctorGetDownloadDir( ctor, TR_FORCE, &dir ) ||
581        !tr_ctorGetDownloadDir( ctor, TR_FALLBACK, &dir ) )
582            tor->downloadDir = tr_strdup( dir );
583
584    if( tr_ctorGetIncompleteDir( ctor, &dir ) )
585        dir = tr_sessionGetIncompleteDir( session );
586    if( tr_sessionIsIncompleteDirEnabled( session ) )
587        tor->incompleteDir = tr_strdup( dir );
588
589    tor->lastPieceSize = info->totalSize % info->pieceSize;
590
591    if( !tor->lastPieceSize )
592        tor->lastPieceSize = info->pieceSize;
593
594    tor->lastBlockSize = info->totalSize % tor->blockSize;
595
596    if( !tor->lastBlockSize )
597        tor->lastBlockSize = tor->blockSize;
598
599    tor->blockCount =
600        ( info->totalSize + tor->blockSize - 1 ) / tor->blockSize;
601
602    tor->blockCountInPiece =
603        info->pieceSize / tor->blockSize;
604
605    tor->blockCountInLastPiece =
606        ( tor->lastPieceSize + tor->blockSize - 1 ) / tor->blockSize;
607
608    /* check our work */
609    assert( ( info->pieceSize % tor->blockSize ) == 0 );
610    t = info->pieceCount - 1;
611    t *= info->pieceSize;
612    t += tor->lastPieceSize;
613    assert( t == info->totalSize );
614    t = tor->blockCount - 1;
615    t *= tor->blockSize;
616    t += tor->lastBlockSize;
617    assert( t == info->totalSize );
618    t = info->pieceCount - 1;
619    t *= tor->blockCountInPiece;
620    t += tor->blockCountInLastPiece;
621    assert( t == (uint64_t)tor->blockCount );
622
623    tr_cpConstruct( &tor->completion, tor );
624
625    tr_torrentInitFilePieces( tor );
626
627    tr_rcConstruct( &tor->swarmSpeed );
628
629    tr_sha1( tor->obfuscatedHash, "req2", 4,
630             info->hash, SHA_DIGEST_LENGTH,
631             NULL );
632
633    tr_peerMgrAddTorrent( session->peerMgr, tor );
634
635    assert( !tor->downloadedCur );
636    assert( !tor->uploadedCur );
637
638    tr_ctorInitTorrentPriorities( ctor, tor );
639
640    tr_ctorInitTorrentWanted( ctor, tor );
641
642    tor->error = TR_STAT_OK;
643
644    tr_bitfieldConstruct( &tor->checkedPieces, tor->info.pieceCount );
645    tr_torrentUncheck( tor );
646
647    tr_torrentSetAddedDate( tor, time( NULL ) ); /* this is a default value to be
648                                                    overwritten by the resume file */
649
650    loaded = tr_torrentLoadResume( tor, ~0, ctor );
651
652    refreshCurrentDir( tor );
653
654    doStart = tor->isRunning;
655    tor->isRunning = 0;
656
657    if( !( loaded & TR_FR_SPEEDLIMIT ) )
658    {
659        tr_torrentUseSpeedLimit( tor, TR_UP, FALSE );
660        tr_torrentSetSpeedLimit( tor, TR_UP, tr_sessionGetSpeedLimit( tor->session, TR_UP ) );
661        tr_torrentUseSpeedLimit( tor, TR_DOWN, FALSE );
662        tr_torrentSetSpeedLimit( tor, TR_DOWN, tr_sessionGetSpeedLimit( tor->session, TR_DOWN ) );
663        tr_torrentUseSessionLimits( tor, TRUE );
664    }
665
666    if( !( loaded & TR_FR_RATIOLIMIT ) )
667    {
668        tr_torrentSetRatioMode( tor, TR_RATIOLIMIT_GLOBAL );
669        tr_torrentSetRatioLimit( tor, tr_sessionGetRatioLimit( tor->session ) );
670    }
671
672    tor->completeness = tr_cpGetStatus( &tor->completion );
673
674    {
675        tr_torrent * it = NULL;
676        tr_torrent * last = NULL;
677        while( ( it = tr_torrentNext( session, it ) ) )
678            last = it;
679
680        if( !last )
681            session->torrentList = tor;
682        else
683            last->next = tor;
684        ++session->torrentCount;
685    }
686
687    tr_globalUnlock( session );
688
689    /* maybe save our own copy of the metainfo */
690    if( tr_ctorGetSave( ctor ) )
691    {
692        const tr_benc * val;
693        if( !tr_ctorGetMetainfo( ctor, &val ) )
694        {
695            const char * filename = tor->info.torrent;
696            tr_bencToFile( val, TR_FMT_BENC, filename );
697            tr_sessionSetTorrentFile( tor->session, tor->info.hashString, filename );
698        }
699    }
700
701    tor->tiers = tr_announcerAddTorrent( session->announcer, tor );
702    tor->tiersSubscription = tr_announcerSubscribe( tor->tiers, onTrackerResponse, tor );
703
704    tr_metainfoMigrate( session, &tor->info );
705
706    if( doStart )
707        torrentStart( tor );
708}
709
710tr_parse_result
711tr_torrentParse( const tr_ctor * ctor, tr_info * setmeInfo )
712{
713    int             doFree;
714    tr_bool         didParse;
715    tr_info         tmp;
716    const tr_benc * metainfo;
717    tr_session    * session = tr_ctorGetSession( ctor );
718    tr_parse_result result = TR_PARSE_OK;
719
720    if( setmeInfo == NULL )
721        setmeInfo = &tmp;
722    memset( setmeInfo, 0, sizeof( tr_info ) );
723
724    if( tr_ctorGetMetainfo( ctor, &metainfo ) )
725        return TR_PARSE_ERR;
726
727    didParse = tr_metainfoParse( session, setmeInfo, metainfo );
728    doFree = didParse && ( setmeInfo == &tmp );
729
730    if( !didParse )
731        result = TR_PARSE_ERR;
732
733    if( didParse && !getBlockSize( setmeInfo->pieceSize ) )
734        result = TR_PARSE_ERR;
735
736    if( didParse && session && tr_torrentExists( session, setmeInfo->hash ) )
737        result = TR_PARSE_DUPLICATE;
738
739    if( doFree )
740        tr_metainfoFree( setmeInfo );
741
742    return result;
743}
744
745tr_torrent *
746tr_torrentNew( const tr_ctor  * ctor,
747               int            * setmeError )
748{
749    int          err;
750    tr_info      tmpInfo;
751    tr_torrent * tor = NULL;
752
753    assert( ctor != NULL );
754    assert( tr_isSession( tr_ctorGetSession( ctor ) ) );
755
756    err = tr_torrentParse( ctor, &tmpInfo );
757    if( !err )
758    {
759        tor = tr_new0( tr_torrent, 1 );
760        tor->info = tmpInfo;
761        torrentRealInit( tor, ctor );
762    }
763    else if( setmeError )
764    {
765        *setmeError = err;
766    }
767
768    return tor;
769}
770
771/**
772***
773**/
774
775void
776tr_torrentSetDownloadDir( tr_torrent * tor, const char * path )
777{
778    assert( tr_isTorrent( tor  ) );
779
780    if( !path || !tor->downloadDir || strcmp( path, tor->downloadDir ) )
781    {
782        tr_free( tor->downloadDir );
783        tor->downloadDir = tr_strdup( path );
784        tr_torrentSetDirty( tor );
785    }
786
787    refreshCurrentDir( tor );
788}
789
790const char*
791tr_torrentGetDownloadDir( const tr_torrent * tor )
792{
793    assert( tr_isTorrent( tor  ) );
794
795    return tor->downloadDir;
796}
797
798const char *
799tr_torrentGetCurrentDir( const tr_torrent * tor )
800{
801    assert( tr_isTorrent( tor  ) );
802
803    return tor->currentDir;
804}
805
806
807void
808tr_torrentChangeMyPort( tr_torrent * tor )
809{
810    assert( tr_isTorrent( tor  ) );
811
812    tr_announcerChangeMyPort( tor );
813}
814
815static TR_INLINE void
816tr_torrentManualUpdateImpl( void * vtor )
817{
818    tr_torrent * tor = vtor;
819
820    assert( tr_isTorrent( tor  ) );
821
822    if( tor->isRunning )
823        tr_announcerManualAnnounce( tor );
824}
825
826void
827tr_torrentManualUpdate( tr_torrent * tor )
828{
829    assert( tr_isTorrent( tor  ) );
830
831    tr_runInEventThread( tor->session, tr_torrentManualUpdateImpl, tor );
832}
833
834tr_bool
835tr_torrentCanManualUpdate( const tr_torrent * tor )
836{
837    return ( tr_isTorrent( tor  ) )
838        && ( tor->isRunning )
839        && ( tr_announcerCanManualAnnounce( tor ) );
840}
841
842const tr_info *
843tr_torrentInfo( const tr_torrent * tor )
844{
845    return tr_isTorrent( tor ) ? &tor->info : NULL;
846}
847
848const tr_stat *
849tr_torrentStatCached( tr_torrent * tor )
850{
851    const time_t now = time( NULL );
852
853    return tr_isTorrent( tor ) && ( now == tor->lastStatTime )
854         ? &tor->stats
855         : tr_torrentStat( tor );
856}
857
858void
859tr_torrentSetVerifyState( tr_torrent * tor, tr_verify_state state )
860{
861    assert( tr_isTorrent( tor ) );
862    assert( state==TR_VERIFY_NONE || state==TR_VERIFY_WAIT || state==TR_VERIFY_NOW );
863
864    tor->verifyState = state;
865    tor->anyDate = time( NULL );
866}
867
868tr_torrent_activity
869tr_torrentGetActivity( tr_torrent * tor )
870{
871    assert( tr_isTorrent( tor ) );
872
873    tr_torrentRecheckCompleteness( tor );
874
875    if( tor->verifyState == TR_VERIFY_NOW )
876        return TR_STATUS_CHECK;
877    if( tor->verifyState == TR_VERIFY_WAIT )
878        return TR_STATUS_CHECK_WAIT;
879    if( !tor->isRunning )
880        return TR_STATUS_STOPPED;
881    if( tor->completeness == TR_LEECH )
882        return TR_STATUS_DOWNLOAD;
883
884    return TR_STATUS_SEED;
885}
886
887const tr_stat *
888tr_torrentStat( tr_torrent * tor )
889{
890    tr_stat *               s;
891    int                     usableSeeds;
892    uint64_t                now;
893    double                  downloadedForRatio, seedRatio=0;
894    double                  d;
895    tr_bool                 checkSeedRatio;
896
897    if( !tor )
898        return NULL;
899
900    assert( tr_isTorrent( tor ) );
901    tr_torrentLock( tor );
902
903    tor->lastStatTime = time( NULL );
904
905    s = &tor->stats;
906    s->id = tor->uniqueId;
907    s->activity = tr_torrentGetActivity( tor );
908    s->error = tor->error;
909    memcpy( s->errorString, tor->errorString, sizeof( s->errorString ) );
910
911    s->manualAnnounceTime = tr_announcerNextManualAnnounce( tor );
912
913    tr_peerMgrTorrentStats( tor,
914                            &s->peersKnown,
915                            &s->peersConnected,
916                            &usableSeeds,
917                            &s->webseedsSendingToUs,
918                            &s->peersSendingToUs,
919                            &s->peersGettingFromUs,
920                            s->peersFrom );
921
922    now = tr_date( );
923    d = tr_peerMgrGetWebseedSpeed( tor, now );
924    s->swarmSpeed         = tr_rcRate( &tor->swarmSpeed, now );
925    s->rawUploadSpeed     = tr_bandwidthGetRawSpeed  ( tor->bandwidth, now, TR_UP );
926    s->pieceUploadSpeed   = tr_bandwidthGetPieceSpeed( tor->bandwidth, now, TR_UP );
927    s->rawDownloadSpeed   = d + tr_bandwidthGetRawSpeed  ( tor->bandwidth, now, TR_DOWN );
928    s->pieceDownloadSpeed = d + tr_bandwidthGetPieceSpeed( tor->bandwidth, now, TR_DOWN );
929
930    usableSeeds += tor->info.webseedCount;
931
932    s->percentComplete = tr_cpPercentComplete ( &tor->completion );
933
934    s->percentDone   = tr_cpPercentDone  ( &tor->completion );
935    s->leftUntilDone = tr_cpLeftUntilDone( &tor->completion );
936    s->sizeWhenDone  = tr_cpSizeWhenDone ( &tor->completion );
937
938    s->recheckProgress = s->activity == TR_STATUS_CHECK
939                       ? 1.0 -
940                         ( tr_torrentCountUncheckedPieces( tor ) /
941                           (double) tor->info.pieceCount )
942                       : 0.0;
943
944    s->activityDate = tor->activityDate;
945    s->addedDate    = tor->addedDate;
946    s->doneDate     = tor->doneDate;
947    s->startDate    = tor->startDate;
948
949    s->corruptEver     = tor->corruptCur    + tor->corruptPrev;
950    s->downloadedEver  = tor->downloadedCur + tor->downloadedPrev;
951    s->uploadedEver    = tor->uploadedCur   + tor->uploadedPrev;
952    s->haveValid       = tr_cpHaveValid( &tor->completion );
953    s->haveUnchecked   = tr_cpHaveTotal( &tor->completion ) - s->haveValid;
954
955    if( usableSeeds > 0 )
956    {
957        s->desiredAvailable = s->leftUntilDone;
958    }
959    else if( !s->leftUntilDone || !s->peersConnected )
960    {
961        s->desiredAvailable = 0;
962    }
963    else
964    {
965        tr_piece_index_t i;
966        tr_bitfield *    peerPieces = tr_peerMgrGetAvailable( tor );
967        s->desiredAvailable = 0;
968        for( i = 0; i < tor->info.pieceCount; ++i )
969            if( !tor->info.pieces[i].dnd && tr_bitfieldHasFast( peerPieces, i ) )
970                s->desiredAvailable += tr_cpMissingBlocksInPiece( &tor->completion, i );
971        s->desiredAvailable *= tor->blockSize;
972        tr_bitfieldFree( peerPieces );
973    }
974
975    downloadedForRatio = s->downloadedEver ? s->downloadedEver : s->haveValid;
976    s->ratio = tr_getRatio( s->uploadedEver, downloadedForRatio );
977
978    checkSeedRatio = tr_torrentGetSeedRatio( tor, &seedRatio );
979
980    switch( s->activity )
981    {
982        /* etaXLSpeed exists because if we use the piece speed directly,
983         * brief fluctuations cause the ETA to jump all over the place.
984         * so, etaXLSpeed is a smoothed-out version of the piece speed
985         * to dampen the effect of fluctuations */
986
987        case TR_STATUS_DOWNLOAD:
988            if( ( tor->etaDLSpeedCalculatedAt + 800 ) < now ) {
989                tor->etaDLSpeed = ( ( tor->etaDLSpeedCalculatedAt + 4000 ) < now )
990                    ? s->pieceDownloadSpeed /* if no recent previous speed, no need to smooth */
991                    : 0.8*tor->etaDLSpeed + 0.2*s->pieceDownloadSpeed; /* smooth across 5 readings */
992                tor->etaDLSpeedCalculatedAt = now;
993            }
994           
995            if( s->leftUntilDone > s->desiredAvailable )
996                s->eta = TR_ETA_NOT_AVAIL;
997            else if( s->pieceDownloadSpeed < 0.1 )
998                s->eta = TR_ETA_UNKNOWN;
999            else
1000                s->eta = s->leftUntilDone / tor->etaDLSpeed / 1024.0;
1001            break;
1002
1003        case TR_STATUS_SEED:
1004            if( checkSeedRatio )
1005            {
1006                if( ( tor->etaULSpeedCalculatedAt + 800 ) < now ) {
1007                    tor->etaULSpeed = ( ( tor->etaULSpeedCalculatedAt + 4000 ) < now )
1008                        ? s->pieceUploadSpeed /* if no recent previous speed, no need to smooth */
1009                        : 0.8*tor->etaULSpeed + 0.2*s->pieceUploadSpeed; /* smooth across 5 readings */
1010                    tor->etaULSpeedCalculatedAt = now;
1011                }
1012               
1013                if( s->pieceUploadSpeed < 0.1 )
1014                    s->eta = TR_ETA_UNKNOWN;
1015                else
1016                    s->eta = (downloadedForRatio * (seedRatio - s->ratio)) / tor->etaULSpeed / 1024.0;
1017            }
1018            else
1019                s->eta = TR_ETA_NOT_AVAIL;
1020            break;
1021
1022        default:
1023            s->eta = TR_ETA_NOT_AVAIL;
1024            break;
1025    }
1026   
1027    if( !checkSeedRatio || s->ratio >= seedRatio || s->ratio == TR_RATIO_INF ) 
1028        s->percentRatio = 1.0; 
1029    else if( s->ratio == TR_RATIO_NA ) 
1030        s->percentRatio = 0.0; 
1031    else 
1032        s->percentRatio = s->ratio / seedRatio; 
1033
1034    tr_torrentUnlock( tor );
1035
1036    return s;
1037}
1038
1039/***
1040****
1041***/
1042
1043static uint64_t
1044fileBytesCompleted( const tr_torrent * tor, tr_file_index_t index )
1045{
1046    uint64_t total = 0;
1047    const tr_file * f = &tor->info.files[index];
1048
1049    if( f->length )
1050    {
1051        const tr_block_index_t firstBlock = f->offset / tor->blockSize;
1052        const uint64_t lastByte = f->offset + f->length - 1;
1053        const tr_block_index_t lastBlock = lastByte / tor->blockSize;
1054
1055        if( firstBlock == lastBlock )
1056        {
1057            if( tr_cpBlockIsCompleteFast( &tor->completion, firstBlock ) )
1058                total = f->length;
1059        }
1060        else
1061        {
1062            tr_block_index_t i;
1063
1064            /* the first block */
1065            if( tr_cpBlockIsCompleteFast( &tor->completion, firstBlock ) )
1066                total += tor->blockSize - ( f->offset % tor->blockSize );
1067
1068            /* the middle blocks */
1069            if( f->firstPiece == f->lastPiece )
1070            {
1071                for( i=firstBlock+1; i<lastBlock; ++i )
1072                    if( tr_cpBlockIsCompleteFast( &tor->completion, i ) )
1073                        total += tor->blockSize;
1074            }
1075            else
1076            {
1077                uint64_t b = 0;
1078                const tr_block_index_t firstBlockOfLastPiece
1079                           = tr_torPieceFirstBlock( tor, f->lastPiece );
1080                const tr_block_index_t lastBlockOfFirstPiece
1081                           = tr_torPieceFirstBlock( tor, f->firstPiece )
1082                             + tr_torPieceCountBlocks( tor, f->firstPiece ) - 1;
1083
1084                /* the rest of the first piece */
1085                for( i=firstBlock+1; i<lastBlock && i<=lastBlockOfFirstPiece; ++i )
1086                    if( tr_cpBlockIsCompleteFast( &tor->completion, i ) )
1087                        ++b;
1088
1089                /* the middle pieces */
1090                if( f->firstPiece + 1 < f->lastPiece )
1091                    for( i=f->firstPiece+1; i<f->lastPiece; ++i )
1092                        b += tor->blockCountInPiece - tr_cpMissingBlocksInPiece( &tor->completion, i );
1093
1094                /* the rest of the last piece */
1095                for( i=firstBlockOfLastPiece; i<lastBlock; ++i )
1096                    if( tr_cpBlockIsCompleteFast( &tor->completion, i ) )
1097                        ++b;
1098
1099                b *= tor->blockSize;
1100                total += b;
1101            }
1102
1103            /* the last block */
1104            if( tr_cpBlockIsCompleteFast( &tor->completion, lastBlock ) )
1105                total += ( f->offset + f->length ) - ( tor->blockSize * lastBlock );
1106        }
1107    }
1108
1109    return total;
1110}
1111
1112tr_file_stat *
1113tr_torrentFiles( const tr_torrent * tor,
1114                 tr_file_index_t *  fileCount )
1115{
1116    tr_file_index_t       i;
1117    const tr_file_index_t n = tor->info.fileCount;
1118    tr_file_stat *        files = tr_new0( tr_file_stat, n );
1119    tr_file_stat *        walk = files;
1120    const tr_bool         isSeed = tor->completeness == TR_SEED;
1121
1122    assert( tr_isTorrent( tor ) );
1123
1124    for( i=0; i<n; ++i, ++walk ) {
1125        const uint64_t b = isSeed ? tor->info.files[i].length : fileBytesCompleted( tor, i );
1126        walk->bytesCompleted = b;
1127        walk->progress = tr_getRatio( b, tor->info.files[i].length );
1128    }
1129
1130    if( fileCount )
1131        *fileCount = n;
1132
1133    return files;
1134}
1135
1136void
1137tr_torrentFilesFree( tr_file_stat *            files,
1138                     tr_file_index_t fileCount UNUSED )
1139{
1140    tr_free( files );
1141}
1142
1143/***
1144****
1145***/
1146
1147float*
1148tr_torrentWebSpeeds( const tr_torrent * tor )
1149{
1150    return tr_isTorrent( tor )
1151         ? tr_peerMgrWebSpeeds( tor )
1152         : NULL;
1153}
1154
1155tr_peer_stat *
1156tr_torrentPeers( const tr_torrent * tor,
1157                 int *              peerCount )
1158{
1159    tr_peer_stat * ret = NULL;
1160
1161    if( tr_isTorrent( tor ) )
1162        ret = tr_peerMgrPeerStats( tor, peerCount );
1163
1164    return ret;
1165}
1166
1167void
1168tr_torrentPeersFree( tr_peer_stat * peers,
1169                     int peerCount  UNUSED )
1170{
1171    tr_free( peers );
1172}
1173
1174tr_tracker_stat *
1175tr_torrentTrackers( const tr_torrent * torrent,
1176                    int              * setmeTrackerCount )
1177{
1178    assert( tr_isTorrent( torrent ) );
1179
1180    return tr_announcerStats( torrent, setmeTrackerCount );
1181}
1182
1183void
1184tr_torrentTrackersFree( tr_tracker_stat * trackers,
1185                        int trackerCount )
1186{
1187    tr_announcerStatsFree( trackers, trackerCount );
1188}
1189
1190void
1191tr_torrentAvailability( const tr_torrent * tor,
1192                        int8_t *           tab,
1193                        int                size )
1194{
1195    tr_peerMgrTorrentAvailability( tor, tab, size );
1196}
1197
1198void
1199tr_torrentAmountFinished( const tr_torrent * tor,
1200                          float *            tab,
1201                          int                size )
1202{
1203    assert( tr_isTorrent( tor ) );
1204
1205    tr_torrentLock( tor );
1206    tr_cpGetAmountDone( &tor->completion, tab, size );
1207    tr_torrentUnlock( tor );
1208}
1209
1210static void
1211tr_torrentResetTransferStats( tr_torrent * tor )
1212{
1213    assert( tr_isTorrent( tor ) );
1214
1215    tr_torrentLock( tor );
1216
1217    tor->downloadedPrev += tor->downloadedCur;
1218    tor->downloadedCur   = 0;
1219    tor->uploadedPrev   += tor->uploadedCur;
1220    tor->uploadedCur     = 0;
1221    tor->corruptPrev    += tor->corruptCur;
1222    tor->corruptCur      = 0;
1223
1224    tr_torrentSetDirty( tor );
1225
1226    tr_torrentUnlock( tor );
1227}
1228
1229void
1230tr_torrentSetHasPiece( tr_torrent *     tor,
1231                       tr_piece_index_t pieceIndex,
1232                       tr_bool          has )
1233{
1234    assert( tr_isTorrent( tor ) );
1235    assert( pieceIndex < tor->info.pieceCount );
1236
1237    if( has )
1238        tr_cpPieceAdd( &tor->completion, pieceIndex );
1239    else
1240        tr_cpPieceRem( &tor->completion, pieceIndex );
1241}
1242
1243/***
1244****
1245***/
1246
1247static void
1248freeTorrent( tr_torrent * tor )
1249{
1250    tr_torrent * t;
1251    tr_session *  session = tor->session;
1252    tr_info *    inf = &tor->info;
1253
1254    assert( tr_isTorrent( tor ) );
1255    assert( !tor->isRunning );
1256
1257    tr_globalLock( session );
1258
1259    tr_peerMgrRemoveTorrent( tor );
1260
1261    tr_cpDestruct( &tor->completion );
1262
1263    tr_rcDestruct( &tor->swarmSpeed );
1264
1265    tr_announcerUnsubscribe( tor->tiers, tor->tiersSubscription );
1266    tr_announcerRemoveTorrent( session->announcer, tor );
1267
1268    tr_bitfieldDestruct( &tor->checkedPieces );
1269
1270    tr_free( tor->downloadDir );
1271    tr_free( tor->incompleteDir );
1272    tr_free( tor->peer_id );
1273
1274    if( tor == session->torrentList )
1275        session->torrentList = tor->next;
1276    else for( t = session->torrentList; t != NULL; t = t->next ) {
1277        if( t->next == tor ) {
1278            t->next = tor->next;
1279            break;
1280        }
1281    }
1282
1283    assert( session->torrentCount >= 1 );
1284    session->torrentCount--;
1285
1286    tr_bandwidthFree( tor->bandwidth );
1287
1288    tr_metainfoFree( inf );
1289    tr_free( tor );
1290
1291    tr_globalUnlock( session );
1292}
1293
1294/**
1295***  Start/Stop Callback
1296**/
1297
1298static void
1299checkAndStartImpl( void * vtor )
1300{
1301    tr_torrent * tor = vtor;
1302
1303    assert( tr_isTorrent( tor ) );
1304
1305    tr_globalLock( tor->session );
1306
1307    /** If we had local data before, but it's disappeared,
1308        stop the torrent and log an error. */
1309    if( tor->preVerifyTotal && !tr_cpHaveTotal( &tor->completion ) )
1310    {
1311        tr_torrentSetLocalError( tor, _( "Can't find local data.  Try \"Set Location\" to find it, or restart the torrent to re-download." ) );
1312        tr_torrentStop( tor );
1313    }
1314    else
1315    {
1316        const time_t now = time( NULL );
1317        tor->isRunning = TRUE;
1318        tor->needsSeedRatioCheck = TRUE;
1319        tor->error = TR_STAT_OK;
1320        tor->errorString[0] = '\0';
1321        tor->completeness = tr_cpGetStatus( &tor->completion );
1322        tor->startDate = tor->anyDate = now;
1323
1324        tr_torrentResetTransferStats( tor );
1325        tr_announcerTorrentStarted( tor );
1326        tor->dhtAnnounceAt = now + tr_cryptoWeakRandInt( 20 );
1327        tr_peerMgrStartTorrent( tor );
1328    }
1329
1330    tr_globalUnlock( tor->session );
1331}
1332
1333static void
1334checkAndStartCB( tr_torrent * tor )
1335{
1336    assert( tr_isTorrent( tor ) );
1337    assert( tr_isSession( tor->session ) );
1338
1339    tr_runInEventThread( tor->session, checkAndStartImpl, tor );
1340}
1341
1342static void
1343torrentStart( tr_torrent * tor )
1344{
1345    assert( tr_isTorrent( tor ) );
1346
1347    tr_globalLock( tor->session );
1348
1349    if( !tor->isRunning )
1350    {
1351        tr_verifyRemove( tor );
1352
1353        /* corresponds to the peer_id sent as a tracker request parameter.
1354         * one tracker admin says: "When the same torrent is opened and
1355         * closed and opened again without quitting Transmission ...
1356         * change the peerid. It would help sometimes if a stopped event
1357         * was missed to ensure that we didn't think someone was cheating. */
1358        tr_free( tor->peer_id );
1359        tor->peer_id = tr_peerIdNew( );
1360
1361        tor->isRunning = 1;
1362        tr_torrentSetDirty( tor );
1363        tor->preVerifyTotal = tr_cpHaveTotal( &tor->completion );
1364        tr_verifyAdd( tor, checkAndStartCB );
1365    }
1366
1367    tr_globalUnlock( tor->session );
1368}
1369
1370void
1371tr_torrentStart( tr_torrent * tor )
1372{
1373    if( tr_isTorrent( tor ) )
1374        torrentStart( tor );
1375}
1376
1377static void
1378torrentRecheckDoneImpl( void * vtor )
1379{
1380    tr_torrent * tor = vtor;
1381
1382    assert( tr_isTorrent( tor ) );
1383    tr_torrentRecheckCompleteness( tor );
1384
1385    if( tor->preVerifyTotal && !tr_cpHaveTotal( &tor->completion ) )
1386    {
1387        tr_torrentSetLocalError( tor, _( "Can't find local data.  Try \"Set Location\" to find it, or restart the torrent to re-download." ) );
1388        tr_torrentStop( tor );
1389    }
1390    else if( tor->startAfterVerify )
1391    {
1392        tor->startAfterVerify = FALSE;
1393
1394        tr_torrentStart( tor );
1395    }
1396}
1397
1398static void
1399torrentRecheckDoneCB( tr_torrent * tor )
1400{
1401    assert( tr_isTorrent( tor ) );
1402
1403    tr_runInEventThread( tor->session, torrentRecheckDoneImpl, tor );
1404}
1405
1406static void
1407verifyTorrent( void * vtor )
1408{
1409    tr_torrent * tor = vtor;
1410
1411    assert( tr_isTorrent( tor ) );
1412    tr_globalLock( tor->session );
1413
1414    /* if the torrent's already being verified, stop it */
1415    tr_verifyRemove( tor );
1416
1417    /* if the torrent's running, stop it & set the restart-after-verify flag */
1418    if( tor->startAfterVerify || tor->isRunning ) {
1419        tr_torrentStop( tor );
1420        tor->startAfterVerify = TRUE;
1421    }
1422
1423    /* add the torrent to the recheck queue */
1424    tor->preVerifyTotal = tr_cpHaveTotal( &tor->completion );
1425    tr_torrentUncheck( tor );
1426    tr_verifyAdd( tor, torrentRecheckDoneCB );
1427
1428    tr_globalUnlock( tor->session );
1429}
1430
1431void
1432tr_torrentVerify( tr_torrent * tor )
1433{
1434    if( tr_isTorrent( tor ) )
1435        tr_runInEventThread( tor->session, verifyTorrent, tor );
1436}
1437
1438void
1439tr_torrentSave( tr_torrent * tor )
1440{
1441    assert( tr_isTorrent( tor ) );
1442
1443    if( tor->isDirty ) {
1444        tor->isDirty = FALSE;
1445        tr_torrentSaveResume( tor );
1446    }
1447}
1448
1449static void
1450stopTorrent( void * vtor )
1451{
1452    tr_torrent * tor = vtor;
1453
1454    assert( tr_isTorrent( tor ) );
1455
1456    tr_verifyRemove( tor );
1457    tr_peerMgrStopTorrent( tor );
1458    tr_announcerTorrentStopped( tor );
1459
1460    tr_fdTorrentClose( tor->session, tor->uniqueId );
1461
1462    if( !tor->isDeleting )
1463        tr_torrentSave( tor );
1464}
1465
1466void
1467tr_torrentStop( tr_torrent * tor )
1468{
1469    assert( tr_isTorrent( tor ) );
1470
1471    if( tr_isTorrent( tor ) )
1472    {
1473        tr_globalLock( tor->session );
1474
1475        tor->isRunning = 0;
1476        tr_torrentSetDirty( tor );
1477        tr_runInEventThread( tor->session, stopTorrent, tor );
1478
1479        tr_globalUnlock( tor->session );
1480    }
1481}
1482
1483static void
1484closeTorrent( void * vtor )
1485{
1486    tr_benc * d;
1487    tr_torrent * tor = vtor;
1488
1489    assert( tr_isTorrent( tor ) );
1490
1491    d = tr_bencListAddDict( &tor->session->removedTorrents, 2 );
1492    tr_bencDictAddInt( d, "id", tor->uniqueId );
1493    tr_bencDictAddInt( d, "date", time( NULL ) );
1494
1495    stopTorrent( tor );
1496
1497    if( tor->isDeleting )
1498    {
1499        tr_metainfoRemoveSaved( tor->session, &tor->info );
1500        tr_torrentRemoveResume( tor );
1501    }
1502
1503    tor->isRunning = 0;
1504    freeTorrent( tor );
1505}
1506
1507void
1508tr_torrentFree( tr_torrent * tor )
1509{
1510    if( tr_isTorrent( tor ) )
1511    {
1512        tr_session * session = tor->session;
1513        assert( tr_isSession( session ) );
1514        tr_globalLock( session );
1515
1516        tr_torrentClearCompletenessCallback( tor );
1517        tr_runInEventThread( session, closeTorrent, tor );
1518
1519        tr_globalUnlock( session );
1520    }
1521}
1522
1523void
1524tr_torrentRemove( tr_torrent * tor )
1525{
1526    assert( tr_isTorrent( tor ) );
1527
1528    tor->isDeleting = 1;
1529    tr_torrentFree( tor );
1530}
1531
1532/**
1533***  Completeness
1534**/
1535
1536static const char *
1537getCompletionString( int type )
1538{
1539    switch( type )
1540    {
1541        /* Translators: this is a minor point that's safe to skip over, but FYI:
1542           "Complete" and "Done" are specific, different terms in Transmission:
1543           "Complete" means we've downloaded every file in the torrent.
1544           "Done" means we're done downloading the files we wanted, but NOT all
1545           that exist */
1546        case TR_PARTIAL_SEED:
1547            return _( "Done" );
1548
1549        case TR_SEED:
1550            return _( "Complete" );
1551
1552        default:
1553            return _( "Incomplete" );
1554    }
1555}
1556
1557static void
1558fireCompletenessChange( tr_torrent       * tor,
1559                        tr_completeness    status )
1560{
1561    assert( tr_isTorrent( tor ) );
1562    assert( ( status == TR_LEECH )
1563         || ( status == TR_SEED )
1564         || ( status == TR_PARTIAL_SEED ) );
1565
1566    if( tor->completeness_func )
1567        tor->completeness_func( tor, status, tor->completeness_func_user_data );
1568}
1569
1570void
1571tr_torrentSetCompletenessCallback( tr_torrent                    * tor,
1572                                   tr_torrent_completeness_func    func,
1573                                   void                          * user_data )
1574{
1575    assert( tr_isTorrent( tor ) );
1576
1577    tor->completeness_func = func;
1578    tor->completeness_func_user_data = user_data;
1579}
1580
1581void
1582tr_torrentSetRatioLimitHitCallback( tr_torrent                     * tor,
1583                                    tr_torrent_ratio_limit_hit_func  func,
1584                                    void                           * user_data )
1585{
1586    assert( tr_isTorrent( tor ) );
1587
1588    tor->ratio_limit_hit_func = func;
1589    tor->ratio_limit_hit_func_user_data = user_data;
1590}
1591
1592void
1593tr_torrentClearCompletenessCallback( tr_torrent * torrent )
1594{
1595    tr_torrentSetCompletenessCallback( torrent, NULL, NULL );
1596}
1597
1598void
1599tr_torrentClearRatioLimitHitCallback( tr_torrent * torrent )
1600{
1601    tr_torrentSetRatioLimitHitCallback( torrent, NULL, NULL );
1602}
1603
1604void
1605tr_torrentRecheckCompleteness( tr_torrent * tor )
1606{
1607    tr_completeness completeness;
1608
1609    assert( tr_isTorrent( tor ) );
1610
1611    tr_torrentLock( tor );
1612
1613    completeness = tr_cpGetStatus( &tor->completion );
1614
1615    if( completeness != tor->completeness )
1616    {
1617        const int recentChange = tor->downloadedCur != 0;
1618
1619        if( recentChange )
1620        {
1621            tr_torinf( tor, _( "State changed from \"%1$s\" to \"%2$s\"" ),
1622                      getCompletionString( tor->completeness ),
1623                      getCompletionString( completeness ) );
1624        }
1625
1626        tor->completeness = completeness;
1627        tor->needsSeedRatioCheck = TRUE;
1628        tr_fdTorrentClose( tor->session, tor->uniqueId );
1629
1630        /* if the torrent is a seed now,
1631         * and the files used to be in the incompleteDir,
1632         * then move them to the destination directory */
1633        if( tr_torrentIsSeed( tor ) && ( tor->currentDir == tor->incompleteDir ) )
1634            tr_torrentSetLocation( tor, tor->downloadDir, TRUE, NULL, NULL );
1635
1636        fireCompletenessChange( tor, completeness );
1637
1638        if( recentChange && ( completeness == TR_SEED ) )
1639        {
1640            tr_announcerTorrentCompleted( tor );
1641
1642            tor->doneDate = tor->anyDate = time( NULL );
1643        }
1644
1645        tr_torrentSetDirty( tor );
1646    }
1647
1648    tr_torrentUnlock( tor );
1649}
1650
1651/**
1652***  File priorities
1653**/
1654
1655void
1656tr_torrentInitFilePriority( tr_torrent *    tor,
1657                            tr_file_index_t fileIndex,
1658                            tr_priority_t   priority )
1659{
1660    tr_piece_index_t i;
1661    tr_file *        file;
1662
1663    assert( tr_isTorrent( tor ) );
1664    assert( fileIndex < tor->info.fileCount );
1665    assert( tr_isPriority( priority ) );
1666
1667    file = &tor->info.files[fileIndex];
1668    file->priority = priority;
1669    for( i = file->firstPiece; i <= file->lastPiece; ++i )
1670        tor->info.pieces[i].priority = calculatePiecePriority( tor, i, fileIndex );
1671}
1672
1673void
1674tr_torrentSetFilePriorities( tr_torrent *      tor,
1675                             tr_file_index_t * files,
1676                             tr_file_index_t   fileCount,
1677                             tr_priority_t     priority )
1678{
1679    tr_file_index_t i;
1680    assert( tr_isTorrent( tor ) );
1681    tr_torrentLock( tor );
1682
1683    for( i = 0; i < fileCount; ++i )
1684        tr_torrentInitFilePriority( tor, files[i], priority );
1685    tr_torrentSetDirty( tor );
1686    tr_peerMgrRebuildRequests( tor );
1687
1688    tr_torrentUnlock( tor );
1689}
1690
1691tr_priority_t
1692tr_torrentGetFilePriority( const tr_torrent * tor,
1693                           tr_file_index_t    file )
1694{
1695    tr_priority_t ret;
1696
1697    assert( tr_isTorrent( tor ) );
1698
1699    tr_torrentLock( tor );
1700    assert( tor );
1701    assert( file < tor->info.fileCount );
1702    ret = tor->info.files[file].priority;
1703    tr_torrentUnlock( tor );
1704
1705    return ret;
1706}
1707
1708tr_priority_t*
1709tr_torrentGetFilePriorities( const tr_torrent * tor )
1710{
1711    tr_file_index_t i;
1712    tr_priority_t * p;
1713
1714    assert( tr_isTorrent( tor ) );
1715
1716    tr_torrentLock( tor );
1717    p = tr_new0( tr_priority_t, tor->info.fileCount );
1718    for( i = 0; i < tor->info.fileCount; ++i )
1719        p[i] = tor->info.files[i].priority;
1720    tr_torrentUnlock( tor );
1721
1722    return p;
1723}
1724
1725/**
1726***  File DND
1727**/
1728
1729int
1730tr_torrentGetFileDL( const tr_torrent * tor,
1731                     tr_file_index_t    file )
1732{
1733    int doDownload;
1734
1735    assert( tr_isTorrent( tor ) );
1736
1737    tr_torrentLock( tor );
1738
1739    assert( file < tor->info.fileCount );
1740    doDownload = !tor->info.files[file].dnd;
1741
1742    tr_torrentUnlock( tor );
1743    return doDownload != 0;
1744}
1745
1746static void
1747setFileDND( tr_torrent * tor, tr_file_index_t fileIndex, int doDownload )
1748{
1749    tr_file *        file;
1750    const int        dnd = !doDownload;
1751    tr_piece_index_t firstPiece, firstPieceDND;
1752    tr_piece_index_t lastPiece, lastPieceDND;
1753    tr_file_index_t  i;
1754
1755    assert( tr_isTorrent( tor ) );
1756
1757    file = &tor->info.files[fileIndex];
1758    file->dnd = dnd;
1759    firstPiece = file->firstPiece;
1760    lastPiece = file->lastPiece;
1761
1762    /* can't set the first piece to DND unless
1763       every file using that piece is DND */
1764    firstPieceDND = dnd;
1765    if( fileIndex > 0 )
1766    {
1767        for( i = fileIndex - 1; firstPieceDND; --i )
1768        {
1769            if( tor->info.files[i].lastPiece != firstPiece )
1770                break;
1771            firstPieceDND = tor->info.files[i].dnd;
1772            if( !i )
1773                break;
1774        }
1775    }
1776
1777    /* can't set the last piece to DND unless
1778       every file using that piece is DND */
1779    lastPieceDND = dnd;
1780    for( i = fileIndex + 1; lastPieceDND && i < tor->info.fileCount; ++i )
1781    {
1782        if( tor->info.files[i].firstPiece != lastPiece )
1783            break;
1784        lastPieceDND = tor->info.files[i].dnd;
1785    }
1786
1787    if( firstPiece == lastPiece )
1788    {
1789        tor->info.pieces[firstPiece].dnd = firstPieceDND && lastPieceDND;
1790    }
1791    else
1792    {
1793        tr_piece_index_t pp;
1794        tor->info.pieces[firstPiece].dnd = firstPieceDND;
1795        tor->info.pieces[lastPiece].dnd = lastPieceDND;
1796        for( pp = firstPiece + 1; pp < lastPiece; ++pp )
1797            tor->info.pieces[pp].dnd = dnd;
1798    }
1799}
1800
1801void
1802tr_torrentInitFileDLs( tr_torrent      * tor,
1803                       tr_file_index_t * files,
1804                       tr_file_index_t   fileCount,
1805                       tr_bool           doDownload )
1806{
1807    tr_file_index_t i;
1808
1809    assert( tr_isTorrent( tor ) );
1810
1811    tr_torrentLock( tor );
1812
1813    for( i=0; i<fileCount; ++i )
1814        setFileDND( tor, files[i], doDownload );
1815    tr_cpInvalidateDND( &tor->completion );
1816    tor->needsSeedRatioCheck = TRUE;
1817
1818    tr_torrentUnlock( tor );
1819}
1820
1821void
1822tr_torrentSetFileDLs( tr_torrent *      tor,
1823                      tr_file_index_t * files,
1824                      tr_file_index_t   fileCount,
1825                      tr_bool           doDownload )
1826{
1827    assert( tr_isTorrent( tor ) );
1828    tr_torrentLock( tor );
1829
1830    tr_torrentInitFileDLs( tor, files, fileCount, doDownload );
1831    tr_torrentSetDirty( tor );
1832    tr_peerMgrRebuildRequests( tor );
1833
1834    tr_torrentUnlock( tor );
1835}
1836
1837/***
1838****
1839***/
1840
1841tr_priority_t
1842tr_torrentGetPriority( const tr_torrent * tor )
1843{
1844    assert( tr_isTorrent( tor ) );
1845
1846    return tor->bandwidth->priority;
1847}
1848
1849void
1850tr_torrentSetPriority( tr_torrent * tor, tr_priority_t priority )
1851{
1852    assert( tr_isTorrent( tor ) );
1853    assert( tr_isPriority( priority ) );
1854
1855    if( tor->bandwidth->priority != priority )
1856    {
1857        tor->bandwidth->priority = priority;
1858
1859        tr_torrentSetDirty( tor );
1860    }
1861}
1862
1863/***
1864****
1865***/
1866
1867void
1868tr_torrentSetPeerLimit( tr_torrent * tor,
1869                        uint16_t     maxConnectedPeers )
1870{
1871    assert( tr_isTorrent( tor ) );
1872
1873    if ( tor->maxConnectedPeers != maxConnectedPeers )
1874    {
1875        tor->maxConnectedPeers = maxConnectedPeers;
1876
1877        tr_torrentSetDirty( tor );
1878    }
1879}
1880
1881uint16_t
1882tr_torrentGetPeerLimit( const tr_torrent * tor )
1883{
1884    assert( tr_isTorrent( tor ) );
1885
1886    return tor->maxConnectedPeers;
1887}
1888
1889/***
1890****
1891***/
1892
1893tr_block_index_t
1894_tr_block( const tr_torrent * tor,
1895           tr_piece_index_t   index,
1896           uint32_t           offset )
1897{
1898    tr_block_index_t ret;
1899
1900    assert( tr_isTorrent( tor ) );
1901
1902    ret = index;
1903    ret *= ( tor->info.pieceSize / tor->blockSize );
1904    ret += offset / tor->blockSize;
1905    return ret;
1906}
1907
1908tr_bool
1909tr_torrentReqIsValid( const tr_torrent * tor,
1910                      tr_piece_index_t   index,
1911                      uint32_t           offset,
1912                      uint32_t           length )
1913{
1914    int err = 0;
1915
1916    assert( tr_isTorrent( tor ) );
1917
1918    if( index >= tor->info.pieceCount )
1919        err = 1;
1920    else if( length < 1 )
1921        err = 2;
1922    else if( ( offset + length ) > tr_torPieceCountBytes( tor, index ) )
1923        err = 3;
1924    else if( length > MAX_BLOCK_SIZE )
1925        err = 4;
1926    else if( tr_pieceOffset( tor, index, offset, length ) > tor->info.totalSize )
1927        err = 5;
1928
1929    if( err ) tr_tordbg( tor, "index %lu offset %lu length %lu err %d\n",
1930                              (unsigned long)index,
1931                              (unsigned long)offset,
1932                              (unsigned long)length,
1933                              err );
1934
1935    return !err;
1936}
1937
1938uint64_t
1939tr_pieceOffset( const tr_torrent * tor,
1940                tr_piece_index_t   index,
1941                uint32_t           offset,
1942                uint32_t           length )
1943{
1944    uint64_t ret;
1945
1946    assert( tr_isTorrent( tor ) );
1947
1948    ret = tor->info.pieceSize;
1949    ret *= index;
1950    ret += offset;
1951    ret += length;
1952    return ret;
1953}
1954
1955/***
1956****
1957***/
1958
1959void
1960tr_torrentSetPieceChecked( tr_torrent        * tor,
1961                           tr_piece_index_t    piece,
1962                           tr_bool             isChecked )
1963{
1964    assert( tr_isTorrent( tor ) );
1965
1966    if( isChecked )
1967        tr_bitfieldAdd( &tor->checkedPieces, piece );
1968    else
1969        tr_bitfieldRem( &tor->checkedPieces, piece );
1970}
1971
1972void
1973tr_torrentSetFileChecked( tr_torrent *    tor,
1974                          tr_file_index_t fileIndex,
1975                          tr_bool         isChecked )
1976{
1977    const tr_file *        file = &tor->info.files[fileIndex];
1978    const tr_piece_index_t begin = file->firstPiece;
1979    const tr_piece_index_t end = file->lastPiece + 1;
1980
1981    assert( tr_isTorrent( tor ) );
1982
1983    if( isChecked )
1984        tr_bitfieldAddRange( &tor->checkedPieces, begin, end );
1985    else
1986        tr_bitfieldRemRange( &tor->checkedPieces, begin, end );
1987}
1988
1989tr_bool
1990tr_torrentIsFileChecked( const tr_torrent * tor,
1991                         tr_file_index_t    fileIndex )
1992{
1993    const tr_file *        file = &tor->info.files[fileIndex];
1994    const tr_piece_index_t begin = file->firstPiece;
1995    const tr_piece_index_t end = file->lastPiece + 1;
1996    tr_piece_index_t       i;
1997    tr_bool                isChecked = TRUE;
1998
1999    assert( tr_isTorrent( tor ) );
2000
2001    for( i = begin; isChecked && i < end; ++i )
2002        if( !tr_torrentIsPieceChecked( tor, i ) )
2003            isChecked = FALSE;
2004
2005    return isChecked;
2006}
2007
2008void
2009tr_torrentUncheck( tr_torrent * tor )
2010{
2011    assert( tr_isTorrent( tor ) );
2012
2013    tr_bitfieldRemRange( &tor->checkedPieces, 0, tor->info.pieceCount );
2014}
2015
2016int
2017tr_torrentCountUncheckedPieces( const tr_torrent * tor )
2018{
2019    assert( tr_isTorrent( tor ) );
2020
2021    return tor->info.pieceCount - tr_bitfieldCountTrueBits( &tor->checkedPieces );
2022}
2023
2024time_t*
2025tr_torrentGetMTimes( const tr_torrent * tor, size_t * setme_n )
2026{
2027    size_t       i;
2028    const size_t n = tor->info.fileCount;
2029    time_t *     m = tr_new0( time_t, n );
2030
2031    assert( tr_isTorrent( tor ) );
2032
2033    for( i = 0; i < n; ++i )
2034    {
2035        struct stat sb;
2036        char * path = tr_torrentFindFile( tor, i );
2037        if( ( path != NULL ) && !stat( path, &sb ) && S_ISREG( sb.st_mode ) )
2038        {
2039#ifdef SYS_DARWIN
2040            m[i] = sb.st_mtimespec.tv_sec;
2041#else
2042            m[i] = sb.st_mtime;
2043#endif
2044        }
2045        tr_free( path );
2046    }
2047
2048    *setme_n = n;
2049    return m;
2050}
2051
2052/***
2053****
2054***/
2055
2056tr_announce_list_err
2057tr_torrentSetAnnounceList( tr_torrent *            tor,
2058                           const tr_tracker_info * trackers,
2059                           int                     trackerCount )
2060{
2061    int i, j;
2062    tr_benc metainfo;
2063
2064    assert( tr_isTorrent( tor ) );
2065
2066    /* look for bad URLs */
2067    for( i=0; i<trackerCount; ++i )
2068        if( !tr_httpIsValidURL( trackers[i].announce ) )
2069            return TR_ANNOUNCE_LIST_HAS_BAD;
2070
2071    /* look for duplicates */
2072    for( i=0; i<trackerCount; ++i )
2073        for( j=0; j<trackerCount; ++j )
2074            if( ( i != j ) && ( !strcmp( trackers[i].announce, trackers[j].announce ) ) )
2075                return TR_ANNOUNCE_LIST_HAS_DUPLICATES;
2076
2077    /* save to the .torrent file */
2078    if( !tr_bencLoadFile( &metainfo, TR_FMT_BENC, tor->info.torrent ) )
2079    {
2080        int       i;
2081        int       prevTier = -1;
2082        tr_benc * tier = NULL;
2083        tr_benc * announceList;
2084        tr_info   tmpInfo;
2085
2086        /* remove the old fields */
2087        tr_bencDictRemove( &metainfo, "announce" );
2088        tr_bencDictRemove( &metainfo, "announce-list" );
2089
2090        /* add the new fields */
2091        tr_bencDictAddStr( &metainfo, "announce", trackers[0].announce );
2092        announceList = tr_bencDictAddList( &metainfo, "announce-list", 0 );
2093        for( i = 0; i < trackerCount; ++i ) {
2094            if( prevTier != trackers[i].tier ) {
2095                prevTier = trackers[i].tier;
2096                tier = tr_bencListAddList( announceList, 0 );
2097            }
2098            tr_bencListAddStr( tier, trackers[i].announce );
2099        }
2100
2101        /* try to parse it back again, to make sure it's good */
2102        memset( &tmpInfo, 0, sizeof( tr_info ) );
2103        if( tr_metainfoParse( tor->session, &tmpInfo, &metainfo ) )
2104        {
2105            /* it's good, so keep these new trackers and free the old ones */
2106
2107            tr_info swap;
2108            swap.trackers = tor->info.trackers;
2109            swap.trackerCount = tor->info.trackerCount;
2110            tor->info.trackers = tmpInfo.trackers;
2111            tor->info.trackerCount = tmpInfo.trackerCount;
2112            tmpInfo.trackers = swap.trackers;
2113            tmpInfo.trackerCount = swap.trackerCount;
2114
2115            tr_metainfoFree( &tmpInfo );
2116            tr_bencToFile( &metainfo, TR_FMT_BENC, tor->info.torrent );
2117        }
2118
2119        /* cleanup */
2120        tr_bencFree( &metainfo );
2121
2122        /* tell the announcer to reload this torrent's tracker list */
2123        tr_announcerResetTorrent( tor->session->announcer, tor );
2124    }
2125
2126    return TR_ANNOUNCE_LIST_OK;
2127}
2128
2129/**
2130***
2131**/
2132
2133void
2134tr_torrentSetAddedDate( tr_torrent * tor,
2135                        time_t       t )
2136{
2137    assert( tr_isTorrent( tor ) );
2138
2139    tor->addedDate = t;
2140    tor->anyDate = MAX( tor->anyDate, tor->addedDate );
2141}
2142
2143void
2144tr_torrentSetActivityDate( tr_torrent * tor, time_t t )
2145{
2146    assert( tr_isTorrent( tor ) );
2147
2148    tor->activityDate = t;
2149    tor->anyDate = MAX( tor->anyDate, tor->activityDate );
2150}
2151
2152void
2153tr_torrentSetDoneDate( tr_torrent * tor,
2154                       time_t       t )
2155{
2156    assert( tr_isTorrent( tor ) );
2157
2158    tor->doneDate = t;
2159    tor->anyDate = MAX( tor->anyDate, tor->doneDate );
2160}
2161
2162/**
2163***
2164**/
2165
2166uint64_t
2167tr_torrentGetBytesLeftToAllocate( const tr_torrent * tor )
2168{
2169    tr_file_index_t i;
2170    uint64_t bytesLeft = 0;
2171
2172    assert( tr_isTorrent( tor ) );
2173
2174    for( i=0; i<tor->info.fileCount; ++i )
2175    {
2176        if( !tor->info.files[i].dnd )
2177        {
2178            struct stat sb;
2179            const uint64_t length = tor->info.files[i].length;
2180            char * path = tr_torrentFindFile( tor, i );
2181
2182            bytesLeft += length;
2183
2184            if( ( path != NULL ) && !stat( path, &sb )
2185                                 && S_ISREG( sb.st_mode )
2186                                 && ( (uint64_t)sb.st_size <= length ) )
2187                bytesLeft -= sb.st_size;
2188
2189            tr_free( path );
2190        }
2191    }
2192
2193    return bytesLeft;
2194}
2195
2196/****
2197*****  Removing the torrent's local data
2198****/
2199
2200static int
2201vstrcmp( const void * a, const void * b )
2202{
2203    return strcmp( a, b );
2204}
2205
2206static int
2207compareLongestFirst( const void * a, const void * b )
2208{
2209    const size_t alen = strlen( a );
2210    const size_t blen = strlen( b );
2211
2212    if( alen != blen )
2213        return alen > blen ? -1 : 1;
2214
2215    return vstrcmp( a, b );
2216}
2217
2218static void
2219addDirtyFile( const char  * root,
2220              const char  * filename,
2221              tr_ptrArray * dirtyFolders )
2222{
2223    char * dir = tr_dirname( filename );
2224
2225    /* add the parent folders to dirtyFolders until we reach the root or a known-dirty */
2226    while (     ( dir != NULL )
2227             && ( strlen( root ) <= strlen( dir ) )
2228             && ( tr_ptrArrayFindSorted( dirtyFolders, dir, vstrcmp ) == NULL ) )
2229    {
2230        char * tmp;
2231        tr_ptrArrayInsertSorted( dirtyFolders, tr_strdup( dir ), vstrcmp );
2232
2233        tmp = tr_dirname( dir );
2234        tr_free( dir );
2235        dir = tmp;
2236    }
2237
2238    tr_free( dir );
2239}
2240
2241static void
2242walkLocalData( const tr_torrent * tor,
2243               const char       * root,
2244               const char       * dir,
2245               const char       * base,
2246               tr_ptrArray      * torrentFiles,
2247               tr_ptrArray      * folders,
2248               tr_ptrArray      * dirtyFolders )
2249{
2250    int i;
2251    struct stat sb;
2252    char * buf;
2253
2254    assert( tr_isTorrent( tor ) );
2255
2256    buf = tr_buildPath( dir, base, NULL );
2257    i = stat( buf, &sb );
2258    if( !i )
2259    {
2260        DIR * odir = NULL;
2261
2262        if( S_ISDIR( sb.st_mode ) && ( ( odir = opendir ( buf ) ) ) )
2263        {
2264            struct dirent *d;
2265            tr_ptrArrayInsertSorted( folders, tr_strdup( buf ), vstrcmp );
2266            for( d = readdir( odir ); d != NULL; d = readdir( odir ) )
2267                if( d->d_name && d->d_name[0] != '.' ) /* skip dotfiles */
2268                    walkLocalData( tor, root, buf, d->d_name, torrentFiles, folders, dirtyFolders );
2269            closedir( odir );
2270        }
2271        else if( S_ISREG( sb.st_mode ) && ( sb.st_size > 0 ) )
2272        {
2273            const char * sub = buf + strlen( tor->currentDir ) + strlen( TR_PATH_DELIMITER_STR );
2274            const tr_bool isTorrentFile = tr_ptrArrayFindSorted( torrentFiles, sub, vstrcmp ) != NULL;
2275            if( !isTorrentFile )
2276                addDirtyFile( root, buf, dirtyFolders );
2277        }
2278    }
2279
2280    tr_free( buf );
2281}
2282
2283static void
2284deleteLocalData( tr_torrent * tor, tr_fileFunc fileFunc )
2285{
2286    int i, n;
2287    char ** s;
2288    tr_file_index_t f;
2289    tr_ptrArray torrentFiles = TR_PTR_ARRAY_INIT;
2290    tr_ptrArray folders      = TR_PTR_ARRAY_INIT;
2291    tr_ptrArray dirtyFolders = TR_PTR_ARRAY_INIT; /* dirty == contains non-torrent files */
2292
2293    const char * firstFile = tor->info.files[0].name;
2294    const char * cpch = strchr( firstFile, TR_PATH_DELIMITER );
2295    char * tmp = cpch ? tr_strndup( firstFile, cpch - firstFile ) : NULL;
2296    char * root = tr_buildPath( tor->currentDir, tmp, NULL );
2297
2298    assert( tr_isTorrent( tor ) );
2299
2300    for( f=0; f<tor->info.fileCount; ++f ) {
2301        tr_ptrArrayInsertSorted( &torrentFiles, tr_strdup( tor->info.files[f].name ), vstrcmp );
2302        tr_ptrArrayInsertSorted( &torrentFiles, tr_torrentBuildPartial( tor, f ), vstrcmp );
2303    }
2304
2305    /* build the set of folders and dirtyFolders */
2306    walkLocalData( tor, root, root, NULL, &torrentFiles, &folders, &dirtyFolders );
2307
2308    /* try to remove entire folders first, so that the recycle bin will be tidy */
2309    s = (char**) tr_ptrArrayPeek( &folders, &n );
2310    for( i=0; i<n; ++i )
2311        if( tr_ptrArrayFindSorted( &dirtyFolders, s[i], vstrcmp ) == NULL )
2312            fileFunc( s[i] );
2313
2314    /* now blow away any remaining torrent files, such as torrent files in dirty folders */
2315    for( f=0; f<tor->info.fileCount; ++f ) {
2316        char * path = tr_buildPath( tor->currentDir, tor->info.files[f].name, NULL );
2317        fileFunc( path );
2318        tr_free( path );
2319    }
2320
2321    /* Now clean out the directories left empty from the previous step.
2322     * Work from deepest to shallowest s.t. lower folders
2323     * won't prevent the upper folders from being deleted */
2324    {
2325        tr_ptrArray cleanFolders = TR_PTR_ARRAY_INIT;
2326        s = (char**) tr_ptrArrayPeek( &folders, &n );
2327        for( i=0; i<n; ++i )
2328            if( tr_ptrArrayFindSorted( &dirtyFolders, s[i], vstrcmp ) == NULL )
2329                tr_ptrArrayInsertSorted( &cleanFolders, s[i], compareLongestFirst );
2330        s = (char**) tr_ptrArrayPeek( &cleanFolders, &n );
2331        for( i=0; i<n; ++i ) {
2332#ifdef SYS_DARWIN
2333            char * dsStore = tr_buildPath( s[i], ".DS_Store", NULL );
2334            fileFunc( dsStore );
2335            tr_free( dsStore );
2336#endif
2337            fileFunc( s[i] );
2338        }
2339        tr_ptrArrayDestruct( &cleanFolders, NULL );
2340    }
2341
2342    /* cleanup */
2343    tr_ptrArrayDestruct( &dirtyFolders, tr_free );
2344    tr_ptrArrayDestruct( &folders, tr_free );
2345    tr_ptrArrayDestruct( &torrentFiles, tr_free );
2346    tr_free( root );
2347    tr_free( tmp );
2348}
2349
2350void
2351tr_torrentDeleteLocalData( tr_torrent * tor, tr_fileFunc fileFunc )
2352{
2353    assert( tr_isTorrent( tor ) );
2354
2355    if( fileFunc == NULL )
2356        fileFunc = remove;
2357
2358    /* close all the files because we're about to delete them */
2359    tr_fdTorrentClose( tor->session, tor->uniqueId );
2360
2361    if( tor->info.fileCount > 1 )
2362    {
2363        deleteLocalData( tor, fileFunc );
2364    }
2365    else
2366    {
2367        char * tmp;
2368
2369        /* torrent only has one file */
2370        char * path = tr_buildPath( tor->currentDir, tor->info.files[0].name, NULL );
2371        fileFunc( path );
2372        tr_free( path );
2373
2374       
2375        tmp = tr_torrentBuildPartial( tor, 0 );
2376        path = tr_buildPath( tor->currentDir, tmp, NULL );
2377        fileFunc( path );
2378        tr_free( path );
2379        tr_free( tmp );
2380    }
2381}
2382
2383/***
2384****
2385***/
2386
2387struct LocationData
2388{
2389    tr_bool move_from_old_location;
2390    int * setme_state;
2391    double * setme_progress;
2392    char * location;
2393    tr_torrent * tor;
2394};
2395
2396static void
2397setLocation( void * vdata )
2398{
2399    tr_bool err = FALSE;
2400    tr_bool verify_needed = FALSE;
2401    struct LocationData * data = vdata;
2402    tr_torrent * tor = data->tor;
2403    const tr_bool do_move = data->move_from_old_location;
2404    const char * location = data->location;
2405    double bytesHandled = 0;
2406
2407    assert( tr_isTorrent( tor ) );
2408
2409    if( strcmp( location, tor->currentDir ) )
2410    {
2411        tr_file_index_t i;
2412
2413        /* bad idea to move files while they're being verified... */
2414        tr_verifyRemove( tor );
2415
2416        /* if the torrent is running, stop it and set a flag to
2417         * restart after we're done */
2418        if( tor->isRunning )
2419        {
2420            tr_torrentStop( tor );
2421            tor->startAfterVerify = TRUE;
2422        }
2423
2424        /* try to move the files.
2425         * FIXME: there are still all kinds of nasty cases, like what
2426         * if the target directory runs out of space halfway through... */
2427        for( i=0; !err && i<tor->info.fileCount; ++i )
2428        {
2429            const tr_file * f = &tor->info.files[i];
2430            const char * oldbase;
2431            char * sub;
2432            if( tr_torrentFindFile2( tor, i, &oldbase, &sub ) )
2433            {
2434                char * oldpath = tr_buildPath( oldbase, sub, NULL );
2435                char * newpath = tr_buildPath( location, sub, NULL );
2436
2437                if( do_move )
2438                {
2439                    tr_bool renamed = FALSE;
2440                    errno = 0;
2441                    tr_torinf( tor, "moving \"%s\" to \"%s\"", oldpath, newpath );
2442                    if( tr_moveFile( oldpath, newpath, &renamed ) )
2443                    {
2444                        err = TRUE;
2445                        tr_torerr( tor, "error moving \"%s\" to \"%s\": %s",
2446                                        oldpath, newpath, tr_strerror( errno ) );
2447                    }
2448                    else if( !renamed )
2449                    {
2450                        verify_needed = TRUE;
2451                    }
2452                }
2453
2454                tr_free( newpath );
2455                tr_free( oldpath );
2456                tr_free( sub );
2457            }
2458
2459            if( data->setme_progress )
2460            {
2461                bytesHandled += f->length;
2462                *data->setme_progress = bytesHandled / tor->info.totalSize;
2463            }
2464        }
2465
2466        if( !err )
2467        {
2468            /* blow away the leftover subdirectories in the old location */
2469            if( do_move )
2470                tr_torrentDeleteLocalData( tor, remove );
2471
2472            /* set the new location and reverify */
2473            tr_torrentSetDownloadDir( tor, location );
2474            if( verify_needed )
2475                tr_torrentVerify( tor );
2476            else if( tor->startAfterVerify ) {
2477                tor->startAfterVerify = FALSE;
2478                tr_torrentStart( tor );
2479            }
2480        }
2481    }
2482
2483    if( data->setme_state )
2484        *data->setme_state = err ? TR_LOC_ERROR : TR_LOC_DONE;
2485
2486    /* cleanup */
2487    tr_free( data->location );
2488    tr_free( data );
2489}
2490
2491void
2492tr_torrentSetLocation( tr_torrent  * tor,
2493                       const char  * location,
2494                       tr_bool       move_from_old_location,
2495                       double      * setme_progress,
2496                       int         * setme_state )
2497{
2498    struct LocationData * data;
2499
2500    assert( tr_isTorrent( tor ) );
2501
2502    if( setme_state )
2503        *setme_state = TR_LOC_MOVING;
2504    if( setme_progress )
2505        *setme_progress = 0;
2506
2507    /* run this in the libtransmission thread */
2508    data = tr_new( struct LocationData, 1 );
2509    data->tor = tor;
2510    data->location = tr_strdup( location );
2511    data->move_from_old_location = move_from_old_location;
2512    data->setme_state = setme_state;
2513    data->setme_progress = setme_progress;
2514    tr_runInEventThread( tor->session, setLocation, data );
2515}
2516
2517/***
2518****
2519***/
2520
2521void
2522tr_torrentCheckSeedRatio( tr_torrent * tor )
2523{
2524    double seedRatio;
2525
2526    assert( tr_isTorrent( tor ) );
2527
2528    /* if we're seeding and we've reached our seed ratio limit, stop the torrent */
2529    if( tor->isRunning && tr_torrentIsSeed( tor ) && tr_torrentGetSeedRatio( tor, &seedRatio ) )
2530    {
2531        const uint64_t up = tor->uploadedCur + tor->uploadedPrev;
2532        uint64_t down = tor->downloadedCur + tor->downloadedPrev;
2533        double ratio;
2534
2535        /* maybe we're the initial seeder and never downloaded anything... */
2536        if( down == 0 )
2537            down = tr_cpHaveValid( &tor->completion );
2538
2539        ratio = tr_getRatio( up, down );
2540
2541        if( ratio >= seedRatio || ratio == TR_RATIO_INF )
2542        {
2543            tr_torrentStop( tor );
2544
2545            /* set to no ratio limit to allow easy restarting */
2546            tr_torrentSetRatioMode( tor, TR_RATIOLIMIT_UNLIMITED );
2547
2548            /* maybe notify the client */
2549            if( tor->ratio_limit_hit_func != NULL )
2550                tor->ratio_limit_hit_func( tor, tor->ratio_limit_hit_func_user_data );
2551        }
2552    }
2553}
2554
2555/***
2556****
2557***/
2558
2559void
2560tr_torrentFileCompleted( tr_torrent * tor, tr_file_index_t fileNum )
2561{
2562    char * sub;
2563    const char * base;
2564
2565    /* close the file so that we can reopen in read-only mode as needed */
2566    tr_fdFileClose( tor->session, tor, fileNum );
2567
2568    /* if the torrent's filename on disk isn't the same as the one in the metadata,
2569     * then it's been modified to denote that it was a partial file.
2570     * Now that it's complete, use the proper filename. */
2571    if( tr_torrentFindFile2( tor, fileNum, &base, &sub ) )
2572    {
2573        const tr_file * file = &tor->info.files[fileNum];
2574
2575        if( strcmp( sub, file->name ) )
2576        {
2577            char * oldpath = tr_buildPath( base, sub, NULL );
2578            char * newpath = tr_buildPath( base, file->name, NULL );
2579
2580            if( rename( oldpath, newpath ) )
2581                tr_torerr( tor, "Error moving \"%s\" to \"%s\": %s", oldpath, newpath, tr_strerror( errno ) );
2582
2583            tr_free( newpath );
2584            tr_free( oldpath );
2585        }
2586
2587        tr_free( sub );
2588    }
2589}
2590
2591/***
2592****
2593***/
2594
2595static tr_bool
2596fileExists( const char * filename )
2597{
2598    struct stat sb;
2599    const tr_bool ok = !stat( filename, &sb );
2600    return ok;
2601}
2602
2603tr_bool
2604tr_torrentFindFile2( const tr_torrent * tor, tr_file_index_t fileNum,
2605                     const char ** base, char ** subpath )
2606{
2607    char * part;
2608    const tr_file * file;
2609    const char * b = NULL;
2610    const char * s = NULL;
2611
2612    assert( tr_isTorrent( tor ) );
2613    assert( fileNum < tor->info.fileCount );
2614
2615    file = &tor->info.files[fileNum];
2616    part = tr_torrentBuildPartial( tor, fileNum );
2617
2618    if( b == NULL ) {
2619        char * filename = tr_buildPath( tor->downloadDir, file->name, NULL );
2620        if( fileExists( filename ) ) {
2621            b = tor->downloadDir;
2622            s = file->name;
2623        }
2624        tr_free( filename );
2625    }
2626
2627    if( ( b == NULL ) && ( tor->incompleteDir != NULL ) ) {
2628        char * filename = tr_buildPath( tor->incompleteDir, file->name, NULL );
2629        if( fileExists( filename ) ) {
2630            b = tor->incompleteDir;
2631            s = file->name;
2632        }
2633        tr_free( filename );
2634    }
2635
2636    if( ( b == NULL ) && ( tor->incompleteDir != NULL ) ) {
2637        char * filename = tr_buildPath( tor->incompleteDir, part, NULL );
2638        if( fileExists( filename ) ) {
2639            b = tor->incompleteDir;
2640            s = part;
2641        }
2642        tr_free( filename );
2643    }
2644
2645    if( b == NULL) {
2646        char * filename = tr_buildPath( tor->downloadDir, part, NULL );
2647        if( fileExists( filename ) ) {
2648            b = tor->downloadDir;
2649            s = part;
2650        }
2651        tr_free( filename );
2652    }
2653
2654    if( base != NULL )
2655        *base = b;
2656    if( subpath != NULL )
2657        *subpath = tr_strdup( s );
2658
2659    tr_free( part );
2660    return b != NULL;
2661}
2662
2663
2664char*
2665tr_torrentFindFile( const tr_torrent * tor, tr_file_index_t fileNum )
2666{
2667    char * subpath;
2668    char * ret = NULL;
2669    const char * base;
2670
2671    if( tr_torrentFindFile2( tor, fileNum, &base, &subpath ) )
2672    {
2673        ret = tr_buildPath( base, subpath, NULL );
2674        tr_free( subpath );
2675    }
2676
2677    return ret;
2678}
2679
2680/* Decide whether we should be looking for files in downloadDir or incompleteDir. */
2681static void
2682refreshCurrentDir( tr_torrent * tor )
2683{
2684    const char * dir = NULL;
2685    char * sub;
2686
2687    if( tor->incompleteDir == NULL )
2688        dir = tor->downloadDir;
2689    else if( !tr_torrentFindFile2( tor, 0, &dir, &sub ) )
2690        dir = tor->incompleteDir;
2691
2692    assert( dir != NULL );
2693    assert( ( dir == tor->downloadDir ) || ( dir == tor->incompleteDir ) );
2694    tor->currentDir = dir;
2695}
2696
2697char*
2698tr_torrentBuildPartial( const tr_torrent * tor, tr_file_index_t fileNum )
2699{
2700    return tr_strdup_printf( "%s.part", tor->info.files[fileNum].name );
2701}
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