source: branches/file_selection/libtransmission/torrent.c @ 2147

Last change on this file since 2147 was 2147, checked in by charles, 15 years ago

fix zero-size file bug reported by BMW

  • Property svn:keywords set to Date Rev Author Id
File size: 31.4 KB
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1/******************************************************************************
2 * $Id: torrent.c 2147 2007-06-18 02:48:32Z charles $
3 *
4 * Copyright (c) 2005-2007 Transmission authors and contributors
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included in
14 * all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
19 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
23 *****************************************************************************/
24
25#include "transmission.h"
26#include "shared.h"
27#define INTERVAL_MSEC 100
28
29/***********************************************************************
30 * Local prototypes
31 **********************************************************************/
32static tr_torrent_t * torrentRealInit( tr_handle_t *, tr_torrent_t * tor,
33                                       uint8_t *, int flags, int * error );
34static void torrentReallyStop( tr_torrent_t * );
35
36static void ioInitAdd ( tr_torrent_t * );
37static int ioInitRemove ( tr_torrent_t * );
38static void downloadLoop( void * );
39
40void tr_setUseCustomUpload( tr_torrent_t * tor, int limit )
41{
42    tor->customUploadLimit = limit;
43}
44
45void tr_setUseCustomDownload( tr_torrent_t * tor, int limit )
46{
47    tor->customDownloadLimit = limit;
48}
49
50void tr_setUploadLimit( tr_torrent_t * tor, int limit )
51{
52    tr_rcSetLimit( tor->upload, limit );
53}
54
55void tr_setDownloadLimit( tr_torrent_t * tor, int limit )
56{
57    tr_rcSetLimit( tor->download, limit );
58}
59
60tr_torrent_t *
61tr_torrentInit( tr_handle_t * h, const char * path,
62                uint8_t * hash, int flags, int * error )
63{
64    tr_torrent_t * tor;
65
66    tor  = calloc( 1, sizeof *tor );
67    if( NULL == tor )
68    {
69        *error = TR_EOTHER;
70        return NULL;
71    }
72
73    /* Parse torrent file */
74    if( tr_metainfoParseFile( &tor->info, h->tag, path,
75                              TR_FLAG_SAVE & flags ) )
76    {
77        *error = TR_EINVALID;
78        free( tor );
79        return NULL;
80    }
81
82    return torrentRealInit( h, tor, hash, flags, error );
83}
84
85tr_torrent_t *
86tr_torrentInitData( tr_handle_t * h, uint8_t * data, size_t size,
87                    uint8_t * hash, int flags, int * error )
88{
89    tr_torrent_t * tor;
90
91    tor  = calloc( 1, sizeof *tor );
92    if( NULL == tor )
93    {
94        *error = TR_EOTHER;
95        return NULL;
96    }
97
98    /* Parse torrent file */
99    if( tr_metainfoParseData( &tor->info, h->tag, data, size,
100                              TR_FLAG_SAVE & flags ) )
101    {
102        *error = TR_EINVALID;
103        free( tor );
104        return NULL;
105    }
106
107    return torrentRealInit( h, tor, hash, flags, error );
108}
109
110tr_torrent_t *
111tr_torrentInitSaved( tr_handle_t * h, const char * hashStr,
112                     int flags, int * error )
113{
114    tr_torrent_t * tor;
115
116    tor  = calloc( 1, sizeof *tor );
117    if( NULL == tor )
118    {
119        *error = TR_EOTHER;
120        return NULL;
121    }
122
123    /* Parse torrent file */
124    if( tr_metainfoParseHash( &tor->info, h->tag, hashStr ) )
125    {
126        *error = TR_EINVALID;
127        free( tor );
128        return NULL;
129    }
130
131    return torrentRealInit( h, tor, NULL, ( TR_FLAG_SAVE | flags ), error );
132}
133
134/***********************************************************************
135 * tr_torrentInit
136 ***********************************************************************
137 * Allocates a tr_torrent_t structure, then relies on tr_metainfoParse
138 * to fill it.
139 **********************************************************************/
140static tr_torrent_t * torrentRealInit( tr_handle_t * h, tr_torrent_t * tor,
141                                       uint8_t * hash, int flags, int * error )
142{
143    tr_torrent_t  * tor_tmp;
144    tr_info_t     * inf;
145    int             i;
146   
147    inf         = &tor->info;
148    inf->flags |= flags;
149
150    tr_sharedLock( h->shared );
151
152    /* Make sure this torrent is not already open */
153    for( tor_tmp = h->torrentList; tor_tmp; tor_tmp = tor_tmp->next )
154    {
155        if( !memcmp( tor->info.hash, tor_tmp->info.hash,
156                     SHA_DIGEST_LENGTH ) )
157        {
158            if( NULL != hash )
159            {
160                memcpy( hash, tor->info.hash, SHA_DIGEST_LENGTH );
161            }
162            *error = TR_EDUPLICATE;
163            tr_metainfoFree( &tor->info );
164            free( tor );
165            tr_sharedUnlock( h->shared );
166            return NULL;
167        }
168    }
169
170    tor->handle   = h;
171    tor->status   = TR_STATUS_PAUSE;
172    tor->id       = h->id;
173    tor->key      = h->key;
174    tor->azId     = h->azId;
175    tor->hasChangedState = -1;
176
177    /* Escaped info hash for HTTP queries */
178    for( i = 0; i < SHA_DIGEST_LENGTH; i++ )
179    {
180        snprintf( &tor->escapedHashString[3*i],
181                  sizeof( tor->escapedHashString ) - 3 * i,
182                  "%%%02x", inf->hash[i] );
183    }
184
185    tor->pexDisabled = 0;
186
187    /* Block size: usually 16 ko, or less if we have to */
188    tor->blockSize  = MIN( inf->pieceSize, 1 << 14 );
189    tor->blockCount = ( inf->totalSize + tor->blockSize - 1 ) /
190                        tor->blockSize;
191    tor->completion = tr_cpInit( tor );
192
193    tor->thread = THREAD_EMPTY;
194    tr_lockInit( &tor->lock );
195    tr_condInit( &tor->cond );
196
197    tor->upload         = tr_rcInit();
198    tor->download       = tr_rcInit();
199    tor->swarmspeed     = tr_rcInit();
200 
201    /* We have a new torrent */
202    tor->publicPort = tr_sharedGetPublicPort( h->shared );
203    tor->prev       = NULL;
204    tor->next       = h->torrentList;
205    if( tor->next )
206    {
207        tor->next->prev = tor;
208    }
209    h->torrentList = tor;
210    (h->torrentCount)++;
211
212    tr_sharedUnlock( h->shared );
213
214    if( !h->isPortSet )
215    {
216        tr_setBindPort( h, TR_DEFAULT_PORT );
217    }
218
219    tr_torrentInitFilePieces( tor );
220
221    return tor;
222}
223
224tr_info_t * tr_torrentInfo( tr_torrent_t * tor )
225{
226    return &tor->info;
227}
228
229/***********************************************************************
230 * tr_torrentScrape     
231 **********************************************************************/
232int tr_torrentScrape( tr_torrent_t * tor, int * s, int * l, int * d )
233{
234    return tr_trackerScrape( tor, s, l, d );
235}
236
237void tr_torrentSetFolder( tr_torrent_t * tor, const char * path )
238{
239    tor->destination = strdup( path );
240    if ( !tor->ioLoaded )
241    {
242        tr_ioLoadResume( tor );
243    }
244}
245
246char * tr_torrentGetFolder( tr_torrent_t * tor )
247{
248    return tor->destination;
249}
250
251int tr_torrentDuplicateDownload( tr_torrent_t * tor )
252{
253    tr_torrent_t * current;
254   
255    /* Check if a torrent with the same name and destination is already active */
256    for( current = tor->handle->torrentList; current; current = current->next )
257    {
258        if( current != tor && current->status != TR_STATUS_PAUSE
259            && !strcmp( tor->destination, current->destination )
260            && !strcmp( tor->info.name, current->info.name ) )
261        {
262            return 1;
263        }
264    }
265    return 0;
266}
267
268void tr_torrentStart( tr_torrent_t * tor )
269{
270    /* Join the thread first */
271    torrentReallyStop( tor );
272   
273    /* Don't start if a torrent with the same name and destination is already active */
274    if( tr_torrentDuplicateDownload( tor ) )
275    {
276        tor->error = TR_ERROR_IO_DUP_DOWNLOAD;
277        snprintf( tor->errorString, sizeof( tor->errorString ),
278                    "%s", tr_errorString( TR_ERROR_IO_DUP_DOWNLOAD ) );
279        return;
280    }
281
282    tr_lockLock( &tor->lock );
283
284    tor->downloadedPrev += tor->downloadedCur;
285    tor->downloadedCur   = 0;
286    tor->uploadedPrev   += tor->uploadedCur;
287    tor->uploadedCur     = 0;
288
289    tor->status  = TR_STATUS_CHECK_WAIT;
290    tor->error   = TR_OK;
291    tor->tracker = tr_trackerInit( tor );
292
293    tor->startDate = tr_date();
294    tor->die = 0;
295    tor->thread = THREAD_EMPTY;
296
297    tr_lockUnlock( &tor->lock );
298
299    ioInitAdd ( tor );
300}
301
302static void torrentStop( tr_torrent_t * tor )
303{
304    tr_trackerStopped( tor->tracker );
305    tr_rcReset( tor->download );
306    tr_rcReset( tor->upload );
307    tr_rcReset( tor->swarmspeed );
308    tor->status = TR_STATUS_STOPPING;
309    tor->stopDate = tr_date();
310}
311
312void tr_torrentStop( tr_torrent_t * tor )
313{
314    tr_lockLock( &tor->lock );
315    torrentStop( tor );
316
317    /* Don't return until the files are closed, so the UI can trash
318     * them if requested */
319    if ( ioInitRemove( tor ) ) /* torrent never got started */
320        tor->status = TR_STATUS_STOPPED;
321    else
322        tr_condWait( &tor->cond, &tor->lock );
323
324    tr_lockUnlock( &tor->lock );
325}
326
327/***********************************************************************
328 * torrentReallyStop
329 ***********************************************************************
330 * Joins the download thread and frees/closes everything related to it.
331 **********************************************************************/
332static void torrentReallyStop( tr_torrent_t * tor )
333{
334    int i;
335
336    tor->die = 1;
337    tr_threadJoin( &tor->thread );
338
339    if( tor->tracker )
340    {
341       tr_trackerClose( tor->tracker );
342       tor->tracker = NULL;
343    }
344
345    tr_lockLock( &tor->lock );
346    for( i = 0; i < tor->peerCount; i++ )
347    {
348        tr_peerDestroy( tor->peers[i] );
349    }
350    tor->peerCount = 0;
351    tr_lockUnlock( &tor->lock );
352}
353
354void tr_torrentDisablePex( tr_torrent_t * tor, int disable )
355{
356    int ii;
357
358    if( TR_FLAG_PRIVATE & tor->info.flags )
359    {
360        return;
361    }
362
363    tr_lockLock( &tor->lock );
364
365    if( tor->pexDisabled == disable )
366    {
367        tr_lockUnlock( &tor->lock );
368        return;
369    }
370
371    tor->pexDisabled = disable;
372    for( ii = 0; ii < tor->peerCount; ii++ )
373    {
374        tr_peerSetPrivate( tor->peers[ii], disable );
375    }
376
377    tr_lockUnlock( &tor->lock );
378}
379
380static int tr_didStateChangeTo ( tr_torrent_t * tor, int status )
381{
382    if( tor->hasChangedState == status )
383    {
384        tor->hasChangedState = -1;
385        return 1;
386    }
387    return 0;
388}
389
390int tr_getIncomplete( tr_torrent_t * tor )
391{
392    return tr_didStateChangeTo( tor, TR_CP_INCOMPLETE );
393}
394int tr_getDone( tr_torrent_t * tor )
395{
396    return tr_didStateChangeTo( tor, TR_CP_DONE );
397}
398int tr_getComplete( tr_torrent_t * tor )
399{
400    return tr_didStateChangeTo( tor, TR_CP_COMPLETE );
401}
402
403void tr_manualUpdate( tr_torrent_t * tor )
404{
405    int peerCount, new;
406    uint8_t * peerCompact;
407
408    if( !( tor->status & TR_STATUS_ACTIVE ) )
409        return;
410   
411    tr_lockLock( &tor->lock );
412    tr_trackerAnnouncePulse( tor->tracker, &peerCount, &peerCompact, 1 );
413    new = 0;
414    if( peerCount > 0 )
415    {
416        new = tr_torrentAddCompact( tor, TR_PEER_FROM_TRACKER,
417                              peerCompact, peerCount );
418        free( peerCompact );
419    }
420    tr_dbg( "got %i peers from manual announce, used %i", peerCount, new );
421    tr_lockUnlock( &tor->lock );
422}
423
424tr_stat_t * tr_torrentStat( tr_torrent_t * tor )
425{
426    tr_stat_t * s;
427    tr_peer_t * peer;
428    tr_info_t * inf = &tor->info;
429    tr_tracker_t * tc;
430    int i;
431
432    tor->statCur = ( tor->statCur + 1 ) % 2;
433    s = &tor->stats[tor->statCur];
434
435    if( ( tor->status & TR_STATUS_STOPPED ) ||
436        ( ( tor->status & TR_STATUS_STOPPING ) &&
437          tr_date() > tor->stopDate + 60000 ) )
438    {
439        torrentReallyStop( tor );
440        tor->status = TR_STATUS_PAUSE;
441    }
442
443    tr_lockLock( &tor->lock );
444
445    s->status = tor->status;
446    s->error  = tor->error;
447    memcpy( s->errorString, tor->errorString,
448            sizeof( s->errorString ) );
449
450    tc = tor->tracker;
451    s->cannotConnect = tr_trackerCannotConnect( tc );
452    s->tracker = ( tc ? tr_trackerGet( tc ) : &inf->trackerList[0].list[0] );
453
454    s->peersTotal       = 0;
455    memset( s->peersFrom, 0, sizeof( s->peersFrom ) );
456    s->peersUploading   = 0;
457    s->peersDownloading = 0;
458   
459    for( i = 0; i < tor->peerCount; i++ )
460    {
461        peer = tor->peers[i];
462   
463        if( tr_peerIsConnected( peer ) )
464        {
465            (s->peersTotal)++;
466            (s->peersFrom[ tr_peerIsFrom( peer ) ])++;
467            if( tr_peerAmInterested( peer ) && !tr_peerIsChoking( peer ) )
468            {
469                (s->peersUploading)++;
470            }
471            if( !tr_peerAmChoking( peer ) )
472            {
473                (s->peersDownloading)++;
474            }
475        }
476    }
477
478    s->percentDone = tr_cpPercentDone( tor->completion );
479    s->percentComplete = tr_cpPercentComplete( tor->completion );
480    s->cpStatus = tr_cpGetStatus( tor->completion );
481    s->left     = tr_cpLeftUntilDone( tor->completion );
482    if( tor->status & TR_STATUS_DOWNLOAD )
483    {
484        s->rateDownload = tr_rcRate( tor->download );
485    }
486    else
487    {
488        /* tr_rcRate() doesn't make the difference between 'piece'
489           messages and other messages, which causes a non-zero
490           download rate even tough we are not downloading. So we
491           force it to zero not to confuse the user. */
492        s->rateDownload = 0.0;
493    }
494    s->rateUpload = tr_rcRate( tor->upload );
495   
496    s->seeders  = tr_trackerSeeders( tc );
497    s->leechers = tr_trackerLeechers( tc );
498    s->completedFromTracker = tr_trackerDownloaded( tc );
499
500    s->swarmspeed = tr_rcRate( tor->swarmspeed );
501   
502    s->startDate = tor->startDate;
503    s->activityDate = tor->activityDate;
504
505    if( s->rateDownload < 0.1 )
506    {
507        s->eta = -1;
508    }
509    else
510    {
511        s->eta = (float) s->left / s->rateDownload / 1024.0;
512    }
513
514    s->uploaded        = tor->uploadedCur   + tor->uploadedPrev;
515    s->downloaded      = tor->downloadedCur + tor->downloadedPrev;
516    s->downloadedValid = tr_cpDownloadedValid( tor->completion );
517   
518    if( s->downloaded == 0 && s->percentDone == 0.0 )
519    {
520        s->ratio = TR_RATIO_NA;
521    }
522    else
523    {
524        s->ratio = (float)s->uploaded
525                 / (float)MAX(s->downloaded, s->downloadedValid);
526    }
527   
528    tr_lockUnlock( &tor->lock );
529
530    return s;
531}
532
533tr_peer_stat_t * tr_torrentPeers( tr_torrent_t * tor, int * peerCount )
534{
535    tr_peer_stat_t * peers;
536
537    tr_lockLock( &tor->lock );
538
539    *peerCount = tor->peerCount;
540   
541    peers = (tr_peer_stat_t *) calloc( tor->peerCount, sizeof( tr_peer_stat_t ) );
542    if (peers != NULL)
543    {
544        tr_peer_t * peer;
545        struct in_addr * addr;
546        int i;
547        for( i = 0; i < tor->peerCount; i++ )
548        {
549            peer = tor->peers[i];
550           
551            addr = tr_peerAddress( peer );
552            if( NULL != addr )
553            {
554                tr_netNtop( addr, peers[i].addr,
555                           sizeof( peers[i].addr ) );
556            }
557           
558            peers[i].client        = tr_peerClient( peer );
559            peers[i].isConnected   = tr_peerIsConnected( peer );
560            peers[i].from          = tr_peerIsFrom( peer );
561            peers[i].progress      = tr_peerProgress( peer );
562            peers[i].port          = tr_peerPort( peer );
563           
564            if( ( peers[i].isDownloading = !tr_peerAmChoking( peer ) ) )
565            {
566                peers[i].uploadToRate = tr_peerUploadRate( peer );
567            }
568            if( ( peers[i].isUploading = ( tr_peerAmInterested( peer ) &&
569                                           !tr_peerIsChoking( peer ) ) ) )
570            {
571                peers[i].downloadFromRate = tr_peerDownloadRate( peer );
572            }
573        }
574    }
575   
576    tr_lockUnlock( &tor->lock );
577   
578    return peers;
579}
580
581void tr_torrentPeersFree( tr_peer_stat_t * peers, int peerCount UNUSED )
582{
583    if (peers == NULL)
584        return;
585
586    free( peers );
587}
588
589void tr_torrentAvailability( tr_torrent_t * tor, int8_t * tab, int size )
590{
591    int i, j, piece;
592    float interval;
593
594    tr_lockLock( &tor->lock );
595    interval = (float)tor->info.pieceCount / (float)size;
596    for( i = 0; i < size; i++ )
597    {
598        piece = i * interval;
599
600        if( tr_cpPieceIsComplete( tor->completion, piece ) )
601        {
602            tab[i] = -1;
603            continue;
604        }
605
606        tab[i] = 0;
607        for( j = 0; j < tor->peerCount; j++ )
608        {
609            if( tr_peerBitfield( tor->peers[j] ) &&
610                tr_bitfieldHas( tr_peerBitfield( tor->peers[j] ), piece ) )
611            {
612                (tab[i])++;
613            }
614        }
615    }
616    tr_lockUnlock( &tor->lock );
617}
618
619size_t
620tr_torrentFileBytesCompleted ( const tr_torrent_t * tor, int fileIndex )
621{
622    const tr_file_t * file     = &tor->info.files[fileIndex];
623    const int firstBlock       =  file->offset / tor->blockSize;
624    const int firstBlockOffset =  file->offset % tor->blockSize;
625    const int lastOffset       =  file->length ? file->length-1 : 0;
626    const int lastBlock        = (file->offset + lastOffset) / tor->blockSize;
627    const int lastBlockOffset  = (file->offset + lastOffset) % % tor->blockSize;
628    size_t haveBytes = 0;
629
630    assert( tor != NULL );
631    assert( 0<=fileIndex && fileIndex<tor->info.fileCount );
632    assert( file->offset + file->length <= tor->info.totalSize );
633    assert( 0<=firstBlock && firstBlock<tor->blockCount );
634    assert( 0<=lastBlock && lastBlock<tor->blockCount );
635    assert( firstBlock <= lastBlock );
636    assert( tr_blockPiece( firstBlock ) == file->firstPiece );
637    assert( tr_blockPiece( lastBlock ) == file->lastPiece );
638
639    if( firstBlock == lastBlock )
640    {
641        if( tr_cpBlockIsComplete( tor->completion, firstBlock ) )
642            haveBytes += lastBlockOffset + 1 - firstBlockOffset;
643    }
644    else
645    {
646        int i;
647
648        if( tr_cpBlockIsComplete( tor->completion, firstBlock ) )
649            haveBytes += tor->blockSize - firstBlockOffset;
650
651        for( i=firstBlock+1; i<lastBlock; ++i )
652            if( tr_cpBlockIsComplete( tor->completion, i ) )
653               haveBytes += tor->blockSize;
654
655        if( tr_cpBlockIsComplete( tor->completion, lastBlock ) )
656            haveBytes += lastBlockOffset + 1;
657    }
658
659    return haveBytes;
660}
661
662float
663tr_torrentFileCompletion ( const tr_torrent_t * tor, int fileIndex )
664{
665    const size_t c = tr_torrentFileBytesCompleted ( tor, fileIndex );
666    return (float)c / tor->info.files[fileIndex].length;
667}
668
669float*
670tr_torrentCompletion( tr_torrent_t * tor )
671{
672    int i;
673    float * f;
674
675    tr_lockLock( &tor->lock );
676    f = calloc ( tor->info.fileCount, sizeof( float ) );
677    for( i=0; i<tor->info.fileCount; ++i )
678       f[i] = tr_torrentFileCompletion ( tor, i );
679    tr_lockUnlock( &tor->lock );
680
681    return f;
682}
683
684void tr_torrentAmountFinished( tr_torrent_t * tor, float * tab, int size )
685{
686    int i, piece;
687    float interval;
688
689    tr_lockLock( &tor->lock );
690    interval = (float)tor->info.pieceCount / (float)size;
691    for( i = 0; i < size; i++ )
692    {
693        piece = i * interval;
694        tab[i] = tr_cpPercentBlocksInPiece( tor->completion, piece );
695    }
696    tr_lockUnlock( &tor->lock );
697}
698
699void tr_torrentRemoveSaved( tr_torrent_t * tor )
700{
701    tr_metainfoRemoveSaved( tor->info.hashString, tor->handle->tag );
702}
703
704void tr_torrentRemoveFastResume( tr_torrent_t * tor )
705{
706    tr_ioRemoveResume( tor );
707}
708
709/***********************************************************************
710 * tr_torrentClose
711 ***********************************************************************
712 * Frees memory allocated by tr_torrentInit.
713 **********************************************************************/
714void tr_torrentClose( tr_torrent_t * tor )
715{
716    tr_handle_t * h = tor->handle;
717    tr_info_t * inf = &tor->info;
718
719    /* Join the thread first */
720    torrentReallyStop( tor );
721
722    tr_sharedLock( h->shared );
723
724    h->torrentCount--;
725
726    tr_lockClose( &tor->lock );
727    tr_condClose( &tor->cond );
728    tr_cpClose( tor->completion );
729
730    tr_rcClose( tor->upload );
731    tr_rcClose( tor->download );
732    tr_rcClose( tor->swarmspeed );
733
734    if( tor->destination )
735    {
736        free( tor->destination );
737    }
738
739    tr_metainfoFree( inf );
740
741    if( tor->prev )
742    {
743        tor->prev->next = tor->next;
744    }
745    else
746    {
747        h->torrentList = tor->next;
748    }
749    if( tor->next )
750    {
751        tor->next->prev = tor->prev;
752    }
753    free( tor );
754
755    tr_sharedUnlock( h->shared );
756}
757
758int tr_torrentAttachPeer( tr_torrent_t * tor, tr_peer_t * peer )
759{
760    int i;
761    tr_peer_t * otherPeer;
762
763    if( tor->peerCount >= TR_MAX_PEER_COUNT )
764    {
765        tr_peerDestroy(  peer );
766        return 0;
767    }
768
769    /* Don't accept two connections from the same IP */
770    for( i = 0; i < tor->peerCount; i++ )
771    {
772        otherPeer = tor->peers[i];
773        if( !memcmp( tr_peerAddress( peer ), tr_peerAddress( otherPeer ), 4 ) )
774        {
775            tr_peerDestroy(  peer );
776            return 0;
777        }
778    }
779
780    tr_peerSetPrivate( peer, tor->info.flags & TR_FLAG_PRIVATE ||
781                       tor->pexDisabled );
782    tr_peerSetTorrent( peer, tor );
783    tor->peers[tor->peerCount++] = peer;
784
785    return 1;
786}
787
788int tr_torrentAddCompact( tr_torrent_t * tor, int from,
789                           uint8_t * buf, int count )
790{
791    struct in_addr addr;
792    in_port_t port;
793    int i, added;
794    tr_peer_t * peer;
795
796    added = 0;
797    for( i = 0; i < count; i++ )
798    {
799        memcpy( &addr, buf, 4 ); buf += 4;
800        memcpy( &port, buf, 2 ); buf += 2;
801
802        peer = tr_peerInit( addr, port, -1, from );
803        added += tr_torrentAttachPeer( tor, peer );
804    }
805
806    return added;
807}
808
809/***********************************************************************
810 * Push a torrent's call to tr_ioInit through a queue in a worker
811 * thread so that only one torrent can be in checkFiles() at a time.
812 **********************************************************************/
813
814struct tr_io_init_list_t
815{
816    tr_torrent_t              * tor;
817    struct tr_io_init_list_t  * next;
818};
819
820static struct tr_io_init_list_t * ioInitQueue = NULL;
821
822static int ioInitWorkerRunning = 0;
823
824static tr_thread_t ioInitThread;
825
826static tr_lock_t* getIOLock( tr_handle_t * h )
827{
828    static tr_lock_t * lock = NULL;
829
830    tr_sharedLock( h->shared );
831    if( lock == NULL )
832    {
833        lock = calloc( 1, sizeof( tr_lock_t ) );
834        tr_lockInit( lock );
835    }
836    tr_sharedUnlock( h->shared );
837
838    return lock;
839}
840
841static void ioInitWorker( void * user_data )
842{
843    tr_handle_t * h = (tr_handle_t*) user_data;
844
845    for (;;)
846    {
847        char name[32];
848
849        /* find the next torrent to process */
850        tr_torrent_t * tor = NULL;
851        tr_lock_t * lock = getIOLock( h );
852        tr_lockLock( lock );
853        if( ioInitQueue != NULL )
854        {
855            struct tr_io_init_list_t * node = ioInitQueue;
856            ioInitQueue = node->next;
857            tor = node->tor;
858            free( node );
859        }
860        tr_lockUnlock( lock );
861
862        /* if no torrents, this worker thread is done */
863        if( tor == NULL )
864        {
865          break;
866        }
867
868        /* check this torrent's files */
869        tor->status = TR_STATUS_CHECK;
870       
871        tr_dbg( "torrent %s checking files", tor->info.name );
872        tr_lockLock( &tor->lock );
873        tr_cpReset( tor->completion );
874        tor->io = tr_ioInit( tor );
875        tr_lockUnlock( &tor->lock );
876
877        snprintf( name, sizeof( name ), "torrent %p", tor );
878        tr_threadCreate( &tor->thread, downloadLoop, tor, name );
879    }
880
881    ioInitWorkerRunning = 0;
882}
883
884/* add tor to the queue of torrents waiting for an tr_ioInit */
885static void ioInitAdd( tr_torrent_t * tor )
886{
887    tr_lock_t * lock = getIOLock( tor->handle );
888    struct tr_io_init_list_t * node;
889    tr_lockLock( lock );
890
891    /* enqueue this torrent to have its io initialized */
892    node = malloc( sizeof( struct tr_io_init_list_t ) );
893    node->tor = tor;
894    node->next = NULL;
895    if( ioInitQueue == NULL )
896    {
897        ioInitQueue = node;
898    }
899    else
900    {
901        struct tr_io_init_list_t * l = ioInitQueue;
902        while( l->next != NULL )
903        {
904            l = l->next;
905        }
906        l->next = node;
907    }
908
909    /* ensure there's a worker thread to process the queue */
910    if( !ioInitWorkerRunning )
911    {
912        ioInitWorkerRunning = 1;
913        tr_threadCreate( &ioInitThread, ioInitWorker, tor->handle, "ioInit" );
914    }
915   
916    tr_lockUnlock( lock );
917}
918
919/* remove tor from the queue of torrents waiting for an tr_ioInit.
920   return nonzero if tor was found and removed */
921static int ioInitRemove( tr_torrent_t * tor )
922{
923    tr_lock_t * lock = getIOLock( tor->handle );
924    struct tr_io_init_list_t *node, *prev;
925    tr_lockLock( lock );
926
927    /* find tor's node */
928    for( prev = NULL, node = ioInitQueue;
929         node != NULL && node->tor != tor;
930         prev=node, node=node->next );
931
932    if( node != NULL )
933    {
934        if( prev == NULL )
935        {
936            ioInitQueue = node->next;
937        }
938        else
939        {
940            prev->next = node->next;
941        }
942    }
943
944    tr_lockUnlock( lock );
945    return node != NULL;
946}
947
948/***********************************************************************
949 * downloadLoop
950 **********************************************************************/
951static void downloadLoop( void * _tor )
952{
953    tr_torrent_t * tor = _tor;
954    int            i, ret;
955    int            peerCount, used;
956    cp_status_t    cpState, cpPrevState;
957    uint8_t      * peerCompact;
958    tr_peer_t    * peer;
959
960    tr_lockLock( &tor->lock );
961
962    cpState = cpPrevState = tr_cpGetStatus( tor->completion );
963    switch( cpState ) {
964        case TR_CP_COMPLETE:   tor->status = TR_STATUS_SEED; break;
965        case TR_CP_DONE:       tor->status = TR_STATUS_DONE; break;
966        case TR_CP_INCOMPLETE: tor->status = TR_STATUS_DOWNLOAD; break;
967    }
968
969    while( !tor->die )
970    {
971        tr_lockUnlock( &tor->lock );
972        tr_wait( INTERVAL_MSEC );
973        tr_lockLock( &tor->lock );
974
975        cpState = tr_cpGetStatus( tor->completion );
976
977        if( cpState != cpPrevState )
978        {
979            switch( cpState ) {
980                case TR_CP_COMPLETE:   tor->status = TR_STATUS_SEED; break;
981                case TR_CP_DONE:       tor->status = TR_STATUS_DONE; break;
982                case TR_CP_INCOMPLETE: tor->status = TR_STATUS_DOWNLOAD; break;
983            }
984
985            tor->hasChangedState = cpState;
986
987            if( cpState == TR_CP_COMPLETE )
988                tr_trackerCompleted( tor->tracker );
989
990            tr_ioSync( tor->io );
991
992            cpPrevState = cpState;
993        }
994
995        /* Try to get new peers or to send a message to the tracker */
996        tr_trackerPulse( tor->tracker, &peerCount, &peerCompact );
997        if( peerCount > 0 )
998        {
999            used = tr_torrentAddCompact( tor, TR_PEER_FROM_TRACKER,
1000                                         peerCompact, peerCount );
1001            free( peerCompact );
1002            tr_dbg( "got %i peers from announce, used %i", peerCount, used );
1003        }
1004        if( tor->status & TR_STATUS_STOPPED )
1005        {
1006            break;
1007        }
1008
1009        /* Stopping: make sure all files are closed and stop talking
1010           to peers */
1011        if( tor->status & TR_STATUS_STOPPING )
1012        {
1013            if( tor->io )
1014            {
1015                tr_ioClose( tor->io ); tor->io = NULL;
1016                tr_condSignal( &tor->cond );
1017            }
1018            continue;
1019        }
1020
1021        /* Shuffle peers */
1022        if( tor->peerCount > 1 )
1023        {
1024            peer = tor->peers[0];
1025            memmove( &tor->peers[0], &tor->peers[1],
1026                    ( tor->peerCount - 1 ) * sizeof( void * ) );
1027            tor->peers[tor->peerCount - 1] = peer;
1028        }
1029
1030        /* Receive/send messages */
1031        for( i = 0; i < tor->peerCount; )
1032        {
1033            peer = tor->peers[i];
1034
1035            ret = tr_peerPulse( peer );
1036            if( ret & TR_ERROR_IO_MASK )
1037            {
1038                tr_err( "Fatal error, stopping download (%d)", ret );
1039                torrentStop( tor );
1040                tor->error = ret;
1041                snprintf( tor->errorString, sizeof( tor->errorString ),
1042                          "%s", tr_errorString( ret ) );
1043                break;
1044            }
1045            if( ret )
1046            {
1047                tr_peerDestroy( peer );
1048                tor->peerCount--;
1049                memmove( &tor->peers[i], &tor->peers[i+1],
1050                         ( tor->peerCount - i ) * sizeof( void * ) );
1051                continue;
1052            }
1053            i++;
1054        }
1055    }
1056
1057    tr_lockUnlock( &tor->lock );
1058
1059    if( tor->io )
1060    {
1061        tr_ioClose( tor->io ); tor->io = NULL;
1062        tr_condSignal( &tor->cond );
1063    }
1064
1065    tor->status = TR_STATUS_STOPPED;
1066}
1067
1068/***
1069****
1070****  File prioritization
1071****
1072***/
1073
1074static int
1075getBytePiece( const tr_info_t * info, uint64_t byteOffset )
1076{
1077    assert( info != NULL );
1078    assert( info->pieceSize != 0 );
1079
1080    return byteOffset / info->pieceSize;
1081}
1082
1083static void
1084initFilePieces ( tr_info_t * info, int fileIndex )
1085{
1086    tr_file_t * file = &info->files[fileIndex];
1087    uint64_t firstByte, lastByte;
1088
1089    assert( info != NULL );
1090    assert( 0<=fileIndex && fileIndex<info->fileCount );
1091
1092    file = &info->files[fileIndex];
1093    firstByte = file->offset;
1094    lastByte = firstByte + (file->length ? file->length-1 : 0);
1095    file->firstPiece = getBytePiece( info, firstByte );
1096    file->lastPiece = getBytePiece( info, lastByte );
1097    tr_dbg( "file #%d is in pieces [%d...%d] (%s)", fileIndex, file->firstPiece, file->lastPiece, file->name );
1098}
1099
1100static tr_priority_t
1101calculatePiecePriority ( const tr_torrent_t * tor,
1102                         int                  piece )
1103{
1104    int i;
1105    tr_priority_t priority = TR_PRI_DND;
1106
1107    for( i=0; i<tor->info.fileCount; ++i )
1108    {
1109        const tr_file_t * file = &tor->info.files[i];
1110        if ( file->firstPiece <= piece
1111          && file->lastPiece  >= piece
1112          && file->priority   >  priority)
1113              priority = file->priority;
1114    }
1115
1116    return priority;
1117}
1118
1119void
1120tr_torrentInitFilePieces( tr_torrent_t * tor )
1121{
1122    int i;
1123    uint64_t offset = 0;
1124
1125    assert( tor != NULL );
1126
1127    for( i=0; i<tor->info.fileCount; ++i ) {
1128      tor->info.files[i].offset = offset;
1129      offset += tor->info.files[i].length;
1130      initFilePieces( &tor->info, i );
1131    }
1132
1133    for( i=0; i<tor->info.pieceCount; ++i )
1134      tor->info.pieces[i].priority = calculatePiecePriority( tor, i );
1135}
1136
1137void
1138tr_torrentSetFilePriority( tr_torrent_t   * tor,
1139                           int              fileIndex,
1140                           tr_priority_t    priority )
1141{
1142    int i;
1143    tr_file_t * file;
1144
1145    assert( tor != NULL );
1146    assert( 0<=fileIndex && fileIndex<tor->info.fileCount );
1147    assert( priority==TR_PRI_LOW || priority==TR_PRI_NORMAL
1148         || priority==TR_PRI_HIGH || priority==TR_PRI_DND );
1149
1150    file = &tor->info.files[fileIndex];
1151    file->priority = priority;
1152    for( i=file->firstPiece; i<=file->lastPiece; ++i )
1153      tor->info.pieces[i].priority = calculatePiecePriority( tor, i );
1154
1155    tr_dbg ( "Setting file #%d (pieces %d-%d) priority to %d (%s)",
1156             fileIndex, file->firstPiece, file->lastPiece,
1157             priority, tor->info.files[fileIndex].name );
1158}
1159
1160tr_priority_t
1161tr_torrentGetFilePriority( const tr_torrent_t *  tor, int file )
1162{
1163    assert( tor != NULL );
1164    assert( 0<=file && file<tor->info.fileCount );
1165
1166    return tor->info.files[file].priority;
1167}
1168
1169
1170void
1171tr_torrentSetFilePriorities( tr_torrent_t         * tor,
1172                             const tr_priority_t  * filePriorities )
1173{
1174    int i;
1175    for( i=0; i<tor->info.pieceCount; ++i )
1176      tr_torrentSetFilePriority( tor, i, filePriorities[i] );
1177}
1178
1179tr_priority_t*
1180tr_torrentGetFilePriorities( const tr_torrent_t * tor )
1181{
1182    int i;
1183    tr_priority_t * p = malloc( tor->info.fileCount * sizeof(tr_priority_t) );
1184    for( i=0; i<tor->info.fileCount; ++i )
1185        p[i] = tor->info.files[i].priority;
1186    return p;
1187}
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