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source: trunk/libtransmission/torrent.c @ 7977

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Last change on this file since 7977 was 7977, checked in by charles, 14 years ago
(trunk libT) #1823: Ratio limit is only checked when peers are active
Property svn:keywords set to `Date Rev Author Id`
File size: 54.1 KB

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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 7977 2009-03-01 13:56:22Z 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 <string.h> /* memcmp */
21	#include <stdlib.h> /* qsort */
22
23	#include <event.h> /* evbuffer */
24
25	#include "transmission.h"
26	#include "session.h"
27	#include "bandwidth.h"
28	#include "bencode.h"
29	#include "completion.h"
30	#include "crypto.h" /* for tr_sha1 */
31	#include "resume.h"
32	#include "fdlimit.h" /* tr_fdFileClose */
33	#include "metainfo.h"
34	#include "peer-mgr.h"
35	#include "platform.h" /* TR_PATH_DELIMITER_STR */
36	#include "ptrarray.h"
37	#include "ratecontrol.h"
38	#include "torrent.h"
39	#include "tracker.h"
40	#include "trevent.h"
41	#include "utils.h"
42	#include "verify.h"
43
44	#define MAX_BLOCK_SIZE ( 1024 * 16 )
45
46	/***
47	****
48	***/
49
50	int
51	tr_torrentId( const tr_torrent * tor )
52	{
53	return tor->uniqueId;
54	}
55
56	tr_torrent*
57	tr_torrentFindFromId( tr_session * session, int id )
58	{
59	tr_torrent * tor = NULL;
60
61	while(( tor = tr_torrentNext( session, tor )))
62	if( tor->uniqueId == id )
63	return tor;
64
65	return NULL;
66	}
67
68	tr_torrent*
69	tr_torrentFindFromHashString( tr_session * session, const char * str )
70	{
71	tr_torrent * tor = NULL;
72
73	while(( tor = tr_torrentNext( session, tor )))
74	if( !strcmp( str, tor->info.hashString ) )
75	return tor;
76
77	return NULL;
78	}
79
80	tr_torrent*
81	tr_torrentFindFromHash( tr_session * session, const uint8_t * torrentHash )
82	{
83	tr_torrent * tor = NULL;
84
85	while(( tor = tr_torrentNext( session, tor )))
86	if( tor->info.hash == torrentHash )
87	if( !memcmp( tor->info.hash, torrentHash, SHA_DIGEST_LENGTH ) )
88	return tor;
89
90	return NULL;
91	}
92
93	tr_torrent*
94	tr_torrentFindFromObfuscatedHash( tr_session * session,
95	const uint8_t * obfuscatedTorrentHash )
96	{
97	tr_torrent * tor = NULL;
98
99	while(( tor = tr_torrentNext( session, tor )))
100	if( !memcmp( tor->obfuscatedHash, obfuscatedTorrentHash,
101	SHA_DIGEST_LENGTH ) )
102	return tor;
103
104	return NULL;
105	}
106
107	/***
108	**** PER-TORRENT UL / DL SPEEDS
109	***/
110
111	void
112	tr_torrentSetSpeedMode( tr_torrent * tor,
113	tr_direction dir,
114	tr_speedlimit mode )
115	{
116	assert( tor != NULL );
117	assert( tr_isDirection( dir ) );
118	assert( mode==TR_SPEEDLIMIT_GLOBAL \|\| mode==TR_SPEEDLIMIT_SINGLE \|\| mode==TR_SPEEDLIMIT_UNLIMITED );
119
120	tor->speedLimitMode[dir] = mode;
121
122	tr_bandwidthSetLimited( tor->bandwidth, dir, mode==TR_SPEEDLIMIT_SINGLE );
123	tr_bandwidthHonorParentLimits( tor->bandwidth, dir, mode==TR_SPEEDLIMIT_GLOBAL );
124	}
125
126	tr_speedlimit
127	tr_torrentGetSpeedMode( const tr_torrent * tor,
128	tr_direction dir )
129	{
130	assert( tor != NULL );
131	assert( tr_isDirection( dir ) );
132
133	return tor->speedLimitMode[dir];
134	}
135
136	void
137	tr_torrentSetSpeedLimit( tr_torrent * tor,
138	tr_direction dir,
139	int desiredSpeed )
140	{
141	tr_bandwidthSetDesiredSpeed( tor->bandwidth, dir, desiredSpeed );
142	}
143
144	int
145	tr_torrentGetSpeedLimit( const tr_torrent * tor,
146	tr_direction dir )
147	{
148	assert( tr_isTorrent( tor ) );
149
150	return tr_bandwidthGetDesiredSpeed( tor->bandwidth, dir );
151	}
152
153	void
154	tr_torrentSetRatioMode( tr_torrent * tor, tr_ratiolimit mode )
155	{
156	assert( tr_isTorrent( tor ) );
157	assert( mode==TR_RATIOLIMIT_GLOBAL \|\| mode==TR_RATIOLIMIT_SINGLE \|\| mode==TR_RATIOLIMIT_UNLIMITED );
158
159	tor->ratioLimitMode = mode;
160
161	tr_torrentCheckSeedRatio( tor );
162	}
163
164	tr_ratiolimit
165	tr_torrentGetRatioMode( const tr_torrent * tor )
166	{
167	assert( tr_isTorrent( tor ) );
168
169	return tor->ratioLimitMode;
170	}
171
172	void
173	tr_torrentSetRatioLimit( tr_torrent * tor,
174	double desiredRatio )
175	{
176	assert( tr_isTorrent( tor ) );
177
178	tor->desiredRatio = desiredRatio;
179
180	tr_torrentCheckSeedRatio( tor );
181	}
182
183	double
184	tr_torrentGetRatioLimit( const tr_torrent * tor )
185	{
186	assert( tr_isTorrent( tor ) );
187
188	return tor->desiredRatio;
189	}
190
191	tr_bool
192	tr_torrentIsPieceTransferAllowed( const tr_torrent * tor,
193	tr_direction direction )
194	{
195	tr_bool isEnabled = FALSE;
196
197	switch( tr_torrentGetSpeedMode( tor, direction ) )
198	{
199	case TR_SPEEDLIMIT_GLOBAL:
200	isEnabled = !tr_sessionIsSpeedLimitEnabled( tor->session, direction )
201	\|\| tr_sessionGetSpeedLimit( tor->session, direction ) > 0;
202	break;
203
204	case TR_SPEEDLIMIT_SINGLE:
205	isEnabled = tr_torrentGetSpeedLimit( tor, direction ) > 0;
206	break;
207
208	case TR_SPEEDLIMIT_UNLIMITED:
209	isEnabled = TRUE;
210	break;
211
212	default:
213	assert( 0 && "unhandled speed mode" );
214	break;
215	}
216
217	return isEnabled;
218	}
219
220	tr_bool
221	tr_torrentGetSeedRatio( const tr_torrent * tor, double * ratio )
222	{
223	tr_bool isLimited;
224
225	switch( tr_torrentGetRatioMode( tor ) )
226	{
227	case TR_RATIOLIMIT_SINGLE:
228	isLimited = TRUE;
229	if( ratio )
230	*ratio = tr_torrentGetRatioLimit( tor );
231	break;
232
233	case TR_RATIOLIMIT_GLOBAL:
234	isLimited = tr_sessionIsRatioLimited( tor->session );
235	if( isLimited && ratio )
236	*ratio = tr_sessionGetRatioLimit( tor->session );
237	break;
238
239	case TR_RATIOLIMIT_UNLIMITED:
240	isLimited = FALSE;
241	break;
242	}
243
244	return isLimited;
245	}
246
247	/***
248	****
249	***/
250
251	static void
252	onTrackerResponse( void * tracker UNUSED,
253	void * vevent,
254	void * user_data )
255	{
256	tr_torrent * tor = user_data;
257	tr_tracker_event * event = vevent;
258
259	switch( event->messageType )
260	{
261	case TR_TRACKER_PEERS:
262	{
263	size_t i, n;
264	tr_pex * pex = tr_peerMgrArrayToPex( event->compact,
265	event->compactLen, &n );
266	if( event->allAreSeeds )
267	tr_tordbg( tor, "Got %d seeds from tracker", (int)n );
268	else
269	tr_torinf( tor, _( "Got %d peers from tracker" ), (int)n );
270
271	for( i = 0; i < n; ++i )
272	{
273	if( event->allAreSeeds )
274	pex[i].flags \|= ADDED_F_SEED_FLAG;
275	tr_peerMgrAddPex( tor, TR_PEER_FROM_TRACKER, pex + i );
276	}
277
278	tr_free( pex );
279	break;
280	}
281
282	case TR_TRACKER_WARNING:
283	tr_torerr( tor, _( "Tracker warning: \"%s\"" ), event->text );
284	tor->error = -1;
285	tr_strlcpy( tor->errorString, event->text,
286	sizeof( tor->errorString ) );
287	break;
288
289	case TR_TRACKER_ERROR:
290	tr_torerr( tor, _( "Tracker error: \"%s\"" ), event->text );
291	tor->error = -2;
292	tr_strlcpy( tor->errorString, event->text,
293	sizeof( tor->errorString ) );
294	break;
295
296	case TR_TRACKER_ERROR_CLEAR:
297	tor->error = 0;
298	tor->errorString[0] = '\0';
299	break;
300	}
301	}
302
303	/***
304	****
305	**** TORRENT INSTANTIATION
306	****
307	***/
308
309	static int
310	getBytePiece( const tr_info * info,
311	uint64_t byteOffset )
312	{
313	assert( info );
314	assert( info->pieceSize != 0 );
315
316	return byteOffset / info->pieceSize;
317	}
318
319	static void
320	initFilePieces( tr_info * info,
321	tr_file_index_t fileIndex )
322	{
323	tr_file * file;
324	uint64_t firstByte, lastByte;
325
326	assert( info );
327	assert( fileIndex < info->fileCount );
328
329	file = &info->files[fileIndex];
330	firstByte = file->offset;
331	lastByte = firstByte + ( file->length ? file->length - 1 : 0 );
332	file->firstPiece = getBytePiece( info, firstByte );
333	file->lastPiece = getBytePiece( info, lastByte );
334	}
335
336	static int
337	pieceHasFile( tr_piece_index_t piece,
338	const tr_file * file )
339	{
340	return ( file->firstPiece <= piece ) && ( piece <= file->lastPiece );
341	}
342
343	static tr_priority_t
344	calculatePiecePriority( const tr_torrent * tor,
345	tr_piece_index_t piece,
346	int fileHint )
347	{
348	tr_file_index_t i;
349	int priority = TR_PRI_LOW;
350
351	/* find the first file that has data in this piece */
352	if( fileHint >= 0 )
353	{
354	i = fileHint;
355	while( i > 0 && pieceHasFile( piece, &tor->info.files[i - 1] ) )
356	--i;
357	}
358	else
359	{
360	for( i = 0; i < tor->info.fileCount; ++i )
361	if( pieceHasFile( piece, &tor->info.files[i] ) )
362	break;
363	}
364
365	/* the piece's priority is the max of the priorities
366	* of all the files in that piece */
367	for( ; i < tor->info.fileCount; ++i )
368	{
369	const tr_file * file = &tor->info.files[i];
370
371	if( !pieceHasFile( piece, file ) )
372	break;
373
374	priority = MAX( priority, file->priority );
375
376	/* when dealing with multimedia files, getting the first and
377	last pieces can sometimes allow you to preview it a bit
378	before it's fully downloaded... */
379	if( file->priority >= TR_PRI_NORMAL )
380	if( file->firstPiece == piece \|\| file->lastPiece == piece )
381	priority = TR_PRI_HIGH;
382	}
383
384	return priority;
385	}
386
387	static void
388	tr_torrentInitFilePieces( tr_torrent * tor )
389	{
390	tr_file_index_t ff;
391	tr_piece_index_t pp;
392	uint64_t offset = 0;
393	tr_info * inf = &tor->info;
394
395	assert( inf );
396
397	for( ff = 0; ff < inf->fileCount; ++ff )
398	{
399	inf->files[ff].offset = offset;
400	offset += inf->files[ff].length;
401	initFilePieces( inf, ff );
402	}
403
404	for( pp = 0; pp < inf->pieceCount; ++pp )
405	inf->pieces[pp].priority = calculatePiecePriority( tor, pp, -1 );
406	}
407
408	int
409	tr_torrentPromoteTracker( tr_torrent * tor,
410	int pos )
411	{
412	int i;
413	int tier;
414
415	assert( tor );
416	assert( ( 0 <= pos ) && ( pos < tor->info.trackerCount ) );
417
418	/* the tier of the tracker we're promoting */
419	tier = tor->info.trackers[pos].tier;
420
421	/* find the index of that tier's first tracker */
422	for( i = 0; i < tor->info.trackerCount; ++i )
423	if( tor->info.trackers[i].tier == tier )
424	break;
425
426	assert( i < tor->info.trackerCount );
427
428	/* promote the tracker at `pos' to the front of the tier */
429	if( i != pos )
430	{
431	const tr_tracker_info tmp = tor->info.trackers[i];
432	tor->info.trackers[i] = tor->info.trackers[pos];
433	tor->info.trackers[pos] = tmp;
434	}
435
436	/* return the new position of the tracker that started out at [pos] */
437	return i;
438	}
439
440	struct RandomTracker
441	{
442	tr_tracker_info tracker;
443	int random_value;
444	};
445
446	/* the tiers will be sorted from lowest to highest,
447	* and trackers are randomized within the tiers */
448	static TR_INLINE int
449	compareRandomTracker( const void * va,
450	const void * vb )
451	{
452	const struct RandomTracker * a = va;
453	const struct RandomTracker * b = vb;
454
455	if( a->tracker.tier != b->tracker.tier )
456	return a->tracker.tier - b->tracker.tier;
457
458	return a->random_value - b->random_value;
459	}
460
461	static void
462	randomizeTiers( tr_info * info )
463	{
464	int i;
465	const int n = info->trackerCount;
466	struct RandomTracker * r = tr_new0( struct RandomTracker, n );
467
468	for( i = 0; i < n; ++i )
469	{
470	r[i].tracker = info->trackers[i];
471	r[i].random_value = tr_cryptoRandInt( INT_MAX );
472	}
473	qsort( r, n, sizeof( struct RandomTracker ), compareRandomTracker );
474	for( i = 0; i < n; ++i )
475	info->trackers[i] = r[i].tracker;
476	tr_free( r );
477	}
478
479	static void torrentStart( tr_torrent * tor,
480	int reloadProgress );
481
482	/**
483	* Decide on a block size. constraints:
484	* (1) most clients decline requests over 16 KiB
485	* (2) pieceSize must be a multiple of block size
486	*/
487	static uint32_t
488	getBlockSize( uint32_t pieceSize )
489	{
490	uint32_t b = pieceSize;
491
492	while( b > MAX_BLOCK_SIZE )
493	b /= 2u;
494
495	if( !b \|\| ( pieceSize % b ) ) /* not cleanly divisible */
496	return 0;
497	return b;
498	}
499
500	static void
501	torrentRealInit( tr_session * session,
502	tr_torrent * tor,
503	const tr_ctor * ctor )
504	{
505	int doStart;
506	uint64_t loaded;
507	uint64_t t;
508	const char * dir;
509	static int nextUniqueId = 1;
510	tr_info * info = &tor->info;
511
512	tr_globalLock( session );
513
514	tor->session = session;
515	tor->uniqueId = nextUniqueId++;
516	tor->magicNumber = TORRENT_MAGIC_NUMBER;
517
518	randomizeTiers( info );
519
520	tor->bandwidth = tr_bandwidthNew( session, session->bandwidth );
521
522	tor->blockSize = getBlockSize( info->pieceSize );
523
524	if( !tr_ctorGetDownloadDir( ctor, TR_FORCE, &dir ) \|\|
525	!tr_ctorGetDownloadDir( ctor, TR_FALLBACK, &dir ) )
526	tor->downloadDir = tr_strdup( dir );
527
528	tor->lastPieceSize = info->totalSize % info->pieceSize;
529
530	if( !tor->lastPieceSize )
531	tor->lastPieceSize = info->pieceSize;
532
533	tor->lastBlockSize = info->totalSize % tor->blockSize;
534
535	if( !tor->lastBlockSize )
536	tor->lastBlockSize = tor->blockSize;
537
538	tor->blockCount =
539	( info->totalSize + tor->blockSize - 1 ) / tor->blockSize;
540
541	tor->blockCountInPiece =
542	info->pieceSize / tor->blockSize;
543
544	tor->blockCountInLastPiece =
545	( tor->lastPieceSize + tor->blockSize - 1 ) / tor->blockSize;
546
547	/* check our work */
548	assert( ( info->pieceSize % tor->blockSize ) == 0 );
549	t = info->pieceCount - 1;
550	t *= info->pieceSize;
551	t += tor->lastPieceSize;
552	assert( t == info->totalSize );
553	t = tor->blockCount - 1;
554	t *= tor->blockSize;
555	t += tor->lastBlockSize;
556	assert( t == info->totalSize );
557	t = info->pieceCount - 1;
558	t *= tor->blockCountInPiece;
559	t += tor->blockCountInLastPiece;
560	assert( t == (uint64_t)tor->blockCount );
561
562	tr_cpConstruct( &tor->completion, tor );
563
564	tr_torrentInitFilePieces( tor );
565
566	tr_rcConstruct( &tor->swarmSpeed );
567
568	tr_sha1( tor->obfuscatedHash, "req2", 4,
569	info->hash, SHA_DIGEST_LENGTH,
570	NULL );
571
572	tr_peerMgrAddTorrent( session->peerMgr, tor );
573
574	assert( session->isPortSet );
575	assert( !tor->downloadedCur );
576	assert( !tor->uploadedCur );
577
578	tor->error = 0;
579
580	tr_bitfieldConstruct( &tor->checkedPieces, tor->info.pieceCount );
581	tr_torrentUncheck( tor );
582
583	tor->addedDate = time( NULL ); /* this is a default value to be
584	overwritten by the resume file */
585	loaded = tr_torrentLoadResume( tor, ~0, ctor );
586
587	doStart = tor->isRunning;
588	tor->isRunning = 0;
589
590	if( !( loaded & TR_FR_SPEEDLIMIT ) )
591	{
592	tr_torrentSetSpeedLimit( tor, TR_UP,
593	tr_sessionGetSpeedLimit( tor->session, TR_UP ) );
594	tr_torrentSetSpeedLimit( tor, TR_DOWN,
595	tr_sessionGetSpeedLimit( tor->session, TR_DOWN ) );
596	}
597
598	if( !( loaded & TR_FR_RATIOLIMIT ) )
599	{
600	tr_torrentSetRatioMode( tor, TR_RATIOLIMIT_GLOBAL );
601	tr_torrentSetRatioLimit( tor, tr_sessionGetRatioLimit( tor->session ) );
602	}
603
604	tor->completeness = tr_cpGetStatus( &tor->completion );
605
606	tor->tracker = tr_trackerNew( tor );
607	tor->trackerSubscription =
608	tr_trackerSubscribe( tor->tracker, onTrackerResponse,
609	tor );
610
611	{
612	tr_torrent * it = NULL;
613	tr_torrent * last = NULL;
614	while( ( it = tr_torrentNext( session, it ) ) )
615	last = it;
616
617	if( !last )
618	session->torrentList = tor;
619	else
620	last->next = tor;
621	++session->torrentCount;
622	}
623
624	tr_globalUnlock( session );
625
626	/* maybe save our own copy of the metainfo */
627	if( tr_ctorGetSave( ctor ) )
628	{
629	const tr_benc * val;
630	if( !tr_ctorGetMetainfo( ctor, &val ) )
631	{
632	const char * filename = tor->info.torrent;
633	tr_bencSaveFile( filename, val );
634	tr_sessionSetTorrentFile( tor->session, tor->info.hashString,
635	filename );
636	}
637	}
638
639	tr_metainfoMigrate( session, &tor->info );
640
641	if( doStart )
642	torrentStart( tor, FALSE );
643	}
644
645	int
646	tr_torrentParse( const tr_session * session,
647	const tr_ctor * ctor,
648	tr_info * setmeInfo )
649	{
650	int err = 0;
651	int doFree;
652	tr_info tmp;
653	const tr_benc * metainfo;
654
655	if( setmeInfo == NULL )
656	setmeInfo = &tmp;
657	memset( setmeInfo, 0, sizeof( tr_info ) );
658
659	if( !err && tr_ctorGetMetainfo( ctor, &metainfo ) )
660	return TR_EINVALID;
661
662	err = tr_metainfoParse( session, setmeInfo, metainfo );
663	doFree = !err && ( setmeInfo == &tmp );
664
665	if( !err && !getBlockSize( setmeInfo->pieceSize ) )
666	err = TR_EINVALID;
667
668	if( !err && tr_torrentExists( session, setmeInfo->hash ) )
669	err = TR_EDUPLICATE;
670
671	if( doFree )
672	tr_metainfoFree( setmeInfo );
673
674	return err;
675	}
676
677	tr_torrent *
678	tr_torrentNew( tr_session * session,
679	const tr_ctor * ctor,
680	int * setmeError )
681	{
682	int err;
683	tr_info tmpInfo;
684	tr_torrent * tor = NULL;
685
686	err = tr_torrentParse( session, ctor, &tmpInfo );
687	if( !err )
688	{
689	tor = tr_new0( tr_torrent, 1 );
690	tor->info = tmpInfo;
691	torrentRealInit( session, tor, ctor );
692	}
693	else if( setmeError )
694	{
695	*setmeError = err;
696	}
697
698	return tor;
699	}
700
701	/**
702	***
703	**/
704
705	void
706	tr_torrentSetDownloadDir( tr_torrent * tor,
707	const char * path )
708	{
709	assert( tr_isTorrent( tor ) );
710
711	if( !path \|\| !tor->downloadDir \|\| strcmp( path, tor->downloadDir ) )
712	{
713	tr_free( tor->downloadDir );
714	tor->downloadDir = tr_strdup( path );
715	tr_torrentSaveResume( tor );
716	}
717	}
718
719	const char*
720	tr_torrentGetDownloadDir( const tr_torrent * tor )
721	{
722	assert( tr_isTorrent( tor ) );
723
724	return tor->downloadDir;
725	}
726
727	void
728	tr_torrentChangeMyPort( tr_torrent * tor )
729	{
730	assert( tr_isTorrent( tor ) );
731
732	if( tor->tracker )
733	tr_trackerChangeMyPort( tor->tracker );
734	}
735
736	static TR_INLINE void
737	tr_torrentManualUpdateImpl( void * vtor )
738	{
739	tr_torrent * tor = vtor;
740
741	assert( tr_isTorrent( tor ) );
742
743	if( tor->isRunning )
744	tr_trackerReannounce( tor->tracker );
745	}
746
747	void
748	tr_torrentManualUpdate( tr_torrent * tor )
749	{
750	assert( tr_isTorrent( tor ) );
751
752	tr_runInEventThread( tor->session, tr_torrentManualUpdateImpl, tor );
753	}
754
755	int
756	tr_torrentCanManualUpdate( const tr_torrent * tor )
757	{
758	return ( tr_isTorrent( tor ) )
759	&& ( tor->isRunning )
760	&& ( tr_trackerCanManualAnnounce( tor->tracker ) );
761	}
762
763	const tr_info *
764	tr_torrentInfo( const tr_torrent * tor )
765	{
766	return tr_isTorrent( tor ) ? &tor->info : NULL;
767	}
768
769	const tr_stat *
770	tr_torrentStatCached( tr_torrent * tor )
771	{
772	const time_t now = time( NULL );
773
774	return tr_isTorrent( tor ) && ( now == tor->lastStatTime )
775	? &tor->stats
776	: tr_torrentStat( tor );
777	}
778
779	tr_torrent_activity
780	tr_torrentGetActivity( tr_torrent * tor )
781	{
782	assert( tr_isTorrent( tor ) );
783
784	tr_torrentRecheckCompleteness( tor );
785
786	if( tor->verifyState == TR_VERIFY_NOW )
787	return TR_STATUS_CHECK;
788	if( tor->verifyState == TR_VERIFY_WAIT )
789	return TR_STATUS_CHECK_WAIT;
790	if( !tor->isRunning )
791	return TR_STATUS_STOPPED;
792	if( tor->completeness == TR_LEECH )
793	return TR_STATUS_DOWNLOAD;
794
795	return TR_STATUS_SEED;
796	}
797
798	const tr_stat *
799	tr_torrentStat( tr_torrent * tor )
800	{
801	tr_stat * s;
802	struct tr_tracker * tc;
803	const tr_tracker_info * ti;
804	int usableSeeds = 0;
805	uint64_t now;
806	double downloadedForRatio, seedRatio;
807
808	if( !tor )
809	return NULL;
810
811	assert( tr_isTorrent( tor ) );
812	tr_torrentLock( tor );
813
814	tor->lastStatTime = time( NULL );
815
816	s = &tor->stats;
817	s->id = tor->uniqueId;
818	s->activity = tr_torrentGetActivity( tor );
819	s->error = tor->error;
820	memcpy( s->errorString, tor->errorString,
821	sizeof( s->errorString ) );
822
823	tc = tor->tracker;
824	ti = tr_trackerGetAddress( tor->tracker, tor );
825	s->announceURL = ti ? ti->announce : NULL;
826	s->scrapeURL = ti ? ti->scrape : NULL;
827	tr_trackerStat( tc, s );
828
829	tr_trackerGetCounts( tc, &s->timesCompleted,
830	&s->leechers,
831	&s->seeders,
832	&s->downloaders );
833
834	tr_peerMgrTorrentStats( tor,
835	&s->peersKnown,
836	&s->peersConnected,
837	&usableSeeds,
838	&s->webseedsSendingToUs,
839	&s->peersSendingToUs,
840	&s->peersGettingFromUs,
841	s->peersFrom );
842
843	now = tr_date( );
844	s->swarmSpeed = tr_rcRate( &tor->swarmSpeed, now );
845	s->rawUploadSpeed = tr_bandwidthGetRawSpeed ( tor->bandwidth, now, TR_UP );
846	s->rawDownloadSpeed = tr_bandwidthGetRawSpeed ( tor->bandwidth, now, TR_DOWN );
847	s->pieceUploadSpeed = tr_bandwidthGetPieceSpeed( tor->bandwidth, now, TR_UP );
848	s->pieceDownloadSpeed = tr_bandwidthGetPieceSpeed( tor->bandwidth, now, TR_DOWN );
849
850	usableSeeds += tor->info.webseedCount;
851
852	s->percentComplete = tr_cpPercentComplete ( &tor->completion );
853
854	s->percentDone = tr_cpPercentDone ( &tor->completion );
855	s->leftUntilDone = tr_cpLeftUntilDone( &tor->completion );
856	s->sizeWhenDone = tr_cpSizeWhenDone ( &tor->completion );
857
858	s->recheckProgress = s->activity == TR_STATUS_CHECK
859	? 1.0 -
860	( tr_torrentCountUncheckedPieces( tor ) /
861	(double) tor->info.pieceCount )
862	: 0.0;
863
864
865	s->activityDate = tor->activityDate;
866	s->addedDate = tor->addedDate;
867	s->doneDate = tor->doneDate;
868	s->startDate = tor->startDate;
869
870	s->corruptEver = tor->corruptCur + tor->corruptPrev;
871	s->downloadedEver = tor->downloadedCur + tor->downloadedPrev;
872	s->uploadedEver = tor->uploadedCur + tor->uploadedPrev;
873	s->haveValid = tr_cpHaveValid( &tor->completion );
874	s->haveUnchecked = tr_cpHaveTotal( &tor->completion ) - s->haveValid;
875
876	if( usableSeeds > 0 )
877	{
878	s->desiredAvailable = s->leftUntilDone;
879	}
880	else if( !s->leftUntilDone \|\| !s->peersConnected )
881	{
882	s->desiredAvailable = 0;
883	}
884	else
885	{
886	tr_piece_index_t i;
887	tr_bitfield * peerPieces = tr_peerMgrGetAvailable( tor );
888	s->desiredAvailable = 0;
889	for( i = 0; i < tor->info.pieceCount; ++i )
890	if( !tor->info.pieces[i].dnd && tr_bitfieldHas( peerPieces, i ) )
891	s->desiredAvailable += tr_cpMissingBlocksInPiece( &tor->completion, i );
892	s->desiredAvailable *= tor->blockSize;
893	tr_bitfieldFree( peerPieces );
894	}
895
896	downloadedForRatio = s->downloadedEver ? s->downloadedEver : s->haveValid;
897	s->ratio = tr_getRatio( s->uploadedEver, downloadedForRatio );
898
899	switch( s->activity )
900	{
901	case TR_STATUS_DOWNLOAD:
902	if( s->leftUntilDone > s->desiredAvailable )
903	s->eta = TR_ETA_NOT_AVAIL;
904	else if( s->pieceDownloadSpeed < 0.1 )
905	s->eta = TR_ETA_UNKNOWN;
906	else
907	s->eta = s->leftUntilDone / s->pieceDownloadSpeed / 1024.0;
908	break;
909
910	case TR_STATUS_SEED:
911	if( tr_torrentGetSeedRatio( tor, &seedRatio ) )
912	{
913	if( s->pieceUploadSpeed < 0.1 )
914	s->eta = TR_ETA_UNKNOWN;
915	else
916	s->eta = (downloadedForRatio * (seedRatio - s->ratio)) / s->pieceUploadSpeed / 1024.0;
917	}
918	else
919	s->eta = TR_ETA_NOT_AVAIL;
920	break;
921
922	default:
923	s->eta = TR_ETA_NOT_AVAIL;
924	break;
925	}
926
927	tr_torrentUnlock( tor );
928
929	return s;
930	}
931
932	/***
933	****
934	***/
935
936	static uint64_t
937	fileBytesCompleted( const tr_torrent * tor,
938	tr_file_index_t fileIndex )
939	{
940	const tr_file * file = &tor->info.files[fileIndex];
941	const tr_block_index_t firstBlock = file->offset /
942	tor->blockSize;
943	const uint64_t firstBlockOffset = file->offset %
944	tor->blockSize;
945	const uint64_t lastOffset =
946	file->length ? ( file->length - 1 ) : 0;
947	const tr_block_index_t lastBlock =
948	( file->offset + lastOffset ) / tor->blockSize;
949	const uint64_t lastBlockOffset =
950	( file->offset + lastOffset ) % tor->blockSize;
951	uint64_t haveBytes = 0;
952
953	assert( tr_isTorrent( tor ) );
954	assert( fileIndex < tor->info.fileCount );
955	assert( file->offset + file->length <= tor->info.totalSize );
956	assert( ( firstBlock < tor->blockCount )
957	\|\| ( !file->length && file->offset == tor->info.totalSize ) );
958	assert( ( lastBlock < tor->blockCount )
959	\|\| ( !file->length && file->offset == tor->info.totalSize ) );
960	assert( firstBlock <= lastBlock );
961	assert( tr_torBlockPiece( tor, firstBlock ) == file->firstPiece );
962	assert( tr_torBlockPiece( tor, lastBlock ) == file->lastPiece );
963
964	if( firstBlock == lastBlock )
965	{
966	if( tr_cpBlockIsComplete( &tor->completion, firstBlock ) )
967	haveBytes += lastBlockOffset + 1 - firstBlockOffset;
968	}
969	else
970	{
971	tr_block_index_t i;
972
973	if( tr_cpBlockIsComplete( &tor->completion, firstBlock ) )
974	haveBytes += tor->blockSize - firstBlockOffset;
975
976	for( i = firstBlock + 1; i < lastBlock; ++i )
977	if( tr_cpBlockIsComplete( &tor->completion, i ) )
978	haveBytes += tor->blockSize;
979
980	if( tr_cpBlockIsComplete( &tor->completion, lastBlock ) )
981	haveBytes += lastBlockOffset + 1;
982	}
983
984	return haveBytes;
985	}
986
987	tr_file_stat *
988	tr_torrentFiles( const tr_torrent * tor,
989	tr_file_index_t * fileCount )
990	{
991	tr_file_index_t i;
992	const tr_file_index_t n = tor->info.fileCount;
993	tr_file_stat * files = tr_new0( tr_file_stat, n );
994	tr_file_stat * walk = files;
995
996	assert( tr_isTorrent( tor ) );
997
998	for( i = 0; i < n; ++i, ++walk )
999	{
1000	const uint64_t b = fileBytesCompleted( tor, i );
1001	walk->bytesCompleted = b;
1002	walk->progress = tr_getRatio( b, tor->info.files[i].length );
1003	}
1004
1005	if( fileCount )
1006	*fileCount = n;
1007
1008	return files;
1009	}
1010
1011	void
1012	tr_torrentFilesFree( tr_file_stat * files,
1013	tr_file_index_t fileCount UNUSED )
1014	{
1015	tr_free( files );
1016	}
1017
1018	/***
1019	****
1020	***/
1021
1022	float*
1023	tr_torrentWebSpeeds( const tr_torrent * tor )
1024	{
1025	return tr_isTorrent( tor )
1026	? tr_peerMgrWebSpeeds( tor )
1027	: NULL;
1028	}
1029
1030	tr_peer_stat *
1031	tr_torrentPeers( const tr_torrent * tor,
1032	int * peerCount )
1033	{
1034	tr_peer_stat * ret = NULL;
1035
1036	if( tr_isTorrent( tor ) )
1037	ret = tr_peerMgrPeerStats( tor, peerCount );
1038
1039	return ret;
1040	}
1041
1042	void
1043	tr_torrentPeersFree( tr_peer_stat * peers,
1044	int peerCount UNUSED )
1045	{
1046	tr_free( peers );
1047	}
1048
1049	void
1050	tr_torrentAvailability( const tr_torrent * tor,
1051	int8_t * tab,
1052	int size )
1053	{
1054	tr_peerMgrTorrentAvailability( tor, tab, size );
1055	}
1056
1057	void
1058	tr_torrentAmountFinished( const tr_torrent * tor,
1059	float * tab,
1060	int size )
1061	{
1062	assert( tr_isTorrent( tor ) );
1063
1064	tr_torrentLock( tor );
1065	tr_cpGetAmountDone( &tor->completion, tab, size );
1066	tr_torrentUnlock( tor );
1067	}
1068
1069	void
1070	tr_torrentResetTransferStats( tr_torrent * tor )
1071	{
1072	assert( tr_isTorrent( tor ) );
1073
1074	tr_torrentLock( tor );
1075
1076	tor->downloadedPrev += tor->downloadedCur;
1077	tor->downloadedCur = 0;
1078	tor->uploadedPrev += tor->uploadedCur;
1079	tor->uploadedCur = 0;
1080	tor->corruptPrev += tor->corruptCur;
1081	tor->corruptCur = 0;
1082
1083	tr_torrentUnlock( tor );
1084	}
1085
1086	void
1087	tr_torrentSetHasPiece( tr_torrent * tor,
1088	tr_piece_index_t pieceIndex,
1089	tr_bool has )
1090	{
1091	assert( tr_isTorrent( tor ) );
1092	assert( pieceIndex < tor->info.pieceCount );
1093
1094	if( has )
1095	tr_cpPieceAdd( &tor->completion, pieceIndex );
1096	else
1097	tr_cpPieceRem( &tor->completion, pieceIndex );
1098	}
1099
1100	/***
1101	****
1102	***/
1103
1104	static void
1105	freeTorrent( tr_torrent * tor )
1106	{
1107	tr_torrent * t;
1108	tr_session * session = tor->session;
1109	tr_info * inf = &tor->info;
1110
1111	assert( tr_isTorrent( tor ) );
1112	assert( !tor->isRunning );
1113
1114	tr_globalLock( session );
1115
1116	tr_peerMgrRemoveTorrent( tor );
1117
1118	tr_cpDestruct( &tor->completion );
1119
1120	tr_rcDestruct( &tor->swarmSpeed );
1121
1122	tr_trackerUnsubscribe( tor->tracker, tor->trackerSubscription );
1123	tr_trackerFree( tor->tracker );
1124	tor->tracker = NULL;
1125
1126	tr_bitfieldDestruct( &tor->checkedPieces );
1127
1128	tr_free( tor->downloadDir );
1129	tr_free( tor->peer_id );
1130
1131	if( tor == session->torrentList )
1132	session->torrentList = tor->next;
1133	else for( t = session->torrentList; t != NULL; t = t->next ) {
1134	if( t->next == tor ) {
1135	t->next = tor->next;
1136	break;
1137	}
1138	}
1139
1140	assert( session->torrentCount >= 1 );
1141	session->torrentCount--;
1142
1143	tr_bandwidthFree( tor->bandwidth );
1144
1145	tr_metainfoFree( inf );
1146	tr_free( tor );
1147
1148	tr_globalUnlock( session );
1149	}
1150
1151	/**
1152	*** Start/Stop Callback
1153	**/
1154
1155	static void
1156	checkAndStartImpl( void * vtor )
1157	{
1158	tr_torrent * tor = vtor;
1159
1160	assert( tr_isTorrent( tor ) );
1161
1162	tr_globalLock( tor->session );
1163
1164	tor->isRunning = 1;
1165	*tor->errorString = '\0';
1166	tr_torrentResetTransferStats( tor );
1167	tor->completeness = tr_cpGetStatus( &tor->completion );
1168	tr_torrentSaveResume( tor );
1169	tor->startDate = time( NULL );
1170	tr_trackerStart( tor->tracker );
1171	tr_peerMgrStartTorrent( tor );
1172
1173	tr_globalUnlock( tor->session );
1174	}
1175
1176	static void
1177	checkAndStartCB( tr_torrent * tor )
1178	{
1179	assert( tr_isTorrent( tor ) );
1180	assert( tr_isSession( tor->session ) );
1181
1182	tr_runInEventThread( tor->session, checkAndStartImpl, tor );
1183	}
1184
1185	static void
1186	torrentStart( tr_torrent * tor,
1187	int reloadProgress )
1188	{
1189	assert( tr_isTorrent( tor ) );
1190
1191	tr_globalLock( tor->session );
1192
1193	if( !tor->isRunning )
1194	{
1195	const int isVerifying = tr_verifyInProgress( tor );
1196
1197	if( !isVerifying && reloadProgress )
1198	tr_torrentLoadResume( tor, TR_FR_PROGRESS, NULL );
1199
1200	tor->isRunning = 1;
1201
1202	if( !isVerifying )
1203	tr_verifyAdd( tor, checkAndStartCB );
1204	}
1205
1206	tr_globalUnlock( tor->session );
1207	}
1208
1209	void
1210	tr_torrentStart( tr_torrent * tor )
1211	{
1212	if( tr_isTorrent( tor ) )
1213	torrentStart( tor, TRUE );
1214	}
1215
1216	static void
1217	torrentRecheckDoneImpl( void * vtor )
1218	{
1219	tr_torrent * tor = vtor;
1220
1221	assert( tr_isTorrent( tor ) );
1222	tr_torrentRecheckCompleteness( tor );
1223	}
1224
1225	static void
1226	torrentRecheckDoneCB( tr_torrent * tor )
1227	{
1228	assert( tr_isTorrent( tor ) );
1229
1230	tr_runInEventThread( tor->session, torrentRecheckDoneImpl, tor );
1231	}
1232
1233	void
1234	tr_torrentVerify( tr_torrent * tor )
1235	{
1236	assert( tr_isTorrent( tor ) );
1237
1238	tr_verifyRemove( tor );
1239
1240	tr_globalLock( tor->session );
1241
1242	tr_torrentUncheck( tor );
1243	tr_verifyAdd( tor, torrentRecheckDoneCB );
1244
1245	tr_globalUnlock( tor->session );
1246	}
1247
1248	static void
1249	tr_torrentCloseLocalFiles( const tr_torrent * tor )
1250	{
1251	tr_file_index_t i;
1252	struct evbuffer * buf = evbuffer_new( );
1253
1254	assert( tr_isTorrent( tor ) );
1255
1256	for( i=0; i<tor->info.fileCount; ++i )
1257	{
1258	const tr_file * file = &tor->info.files[i];
1259	evbuffer_drain( buf, EVBUFFER_LENGTH( buf ) );
1260	evbuffer_add_printf( buf, "%s%s%s", tor->downloadDir, TR_PATH_DELIMITER_STR, file->name );
1261	tr_fdFileClose( (const char*) EVBUFFER_DATA( buf ) );
1262	}
1263
1264	evbuffer_free( buf );
1265	}
1266
1267
1268	static void
1269	stopTorrent( void * vtor )
1270	{
1271	tr_torrent * tor = vtor;
1272
1273	assert( tr_isTorrent( tor ) );
1274
1275	tr_verifyRemove( tor );
1276	tr_peerMgrStopTorrent( tor );
1277	tr_trackerStop( tor->tracker );
1278
1279	tr_torrentCloseLocalFiles( tor );
1280	}
1281
1282	void
1283	tr_torrentStop( tr_torrent * tor )
1284	{
1285	if( tr_isTorrent( tor ) )
1286	{
1287	tr_globalLock( tor->session );
1288
1289	tor->isRunning = 0;
1290	if( !tor->isDeleting )
1291	tr_torrentSaveResume( tor );
1292	tr_runInEventThread( tor->session, stopTorrent, tor );
1293
1294	tr_globalUnlock( tor->session );
1295	}
1296	}
1297
1298	static void
1299	closeTorrent( void * vtor )
1300	{
1301	tr_torrent * tor = vtor;
1302
1303	assert( tr_isTorrent( tor ) );
1304
1305	tr_torrentSaveResume( tor );
1306	tor->isRunning = 0;
1307	stopTorrent( tor );
1308	if( tor->isDeleting )
1309	{
1310	tr_metainfoRemoveSaved( tor->session, &tor->info );
1311	tr_torrentRemoveResume( tor );
1312	}
1313	freeTorrent( tor );
1314	}
1315
1316	void
1317	tr_torrentFree( tr_torrent * tor )
1318	{
1319	if( tr_isTorrent( tor ) )
1320	{
1321	tr_session * session = tor->session;
1322	assert( tr_isSession( session ) );
1323	tr_globalLock( session );
1324
1325	tr_torrentClearCompletenessCallback( tor );
1326	tr_runInEventThread( session, closeTorrent, tor );
1327
1328	tr_globalUnlock( session );
1329	}
1330	}
1331
1332	void
1333	tr_torrentRemove( tr_torrent * tor )
1334	{
1335	assert( tr_isTorrent( tor ) );
1336
1337	tor->isDeleting = 1;
1338	tr_torrentFree( tor );
1339	}
1340
1341	/**
1342	*** Completeness
1343	**/
1344
1345	static const char *
1346	getCompletionString( int type )
1347	{
1348	switch( type )
1349	{
1350	/* Translators: this is a minor point that's safe to skip over, but FYI:
1351	"Complete" and "Done" are specific, different terms in Transmission:
1352	"Complete" means we've downloaded every file in the torrent.
1353	"Done" means we're done downloading the files we wanted, but NOT all
1354	that exist */
1355	case TR_PARTIAL_SEED:
1356	return _( "Done" );
1357
1358	case TR_SEED:
1359	return _( "Complete" );
1360
1361	default:
1362	return _( "Incomplete" );
1363	}
1364	}
1365
1366	static void
1367	fireCompletenessChange( tr_torrent * tor,
1368	tr_completeness status )
1369	{
1370	assert( tr_isTorrent( tor ) );
1371	assert( ( status == TR_LEECH )
1372	\|\| ( status == TR_SEED )
1373	\|\| ( status == TR_PARTIAL_SEED ) );
1374
1375	if( tor->completeness_func )
1376	tor->completeness_func( tor, status, tor->completeness_func_user_data );
1377	}
1378
1379	void
1380	tr_torrentSetCompletenessCallback( tr_torrent * tor,
1381	tr_torrent_completeness_func func,
1382	void * user_data )
1383	{
1384	assert( tr_isTorrent( tor ) );
1385
1386	tor->completeness_func = func;
1387	tor->completeness_func_user_data = user_data;
1388	}
1389
1390	void
1391	tr_torrentSetRatioLimitHitCallback( tr_torrent * tor,
1392	tr_torrent_ratio_limit_hit_func func,
1393	void * user_data )
1394	{
1395	assert( tr_isTorrent( tor ) );
1396
1397	tor->ratio_limit_hit_func = func;
1398	tor->ratio_limit_hit_func_user_data = user_data;
1399	}
1400
1401	void
1402	tr_torrentClearCompletenessCallback( tr_torrent * torrent )
1403	{
1404	tr_torrentSetCompletenessCallback( torrent, NULL, NULL );
1405	}
1406
1407	void
1408	tr_torrentClearRatioLimitHitCallback( tr_torrent * torrent )
1409	{
1410	tr_torrentSetRatioLimitHitCallback( torrent, NULL, NULL );
1411	}
1412
1413	void
1414	tr_torrentRecheckCompleteness( tr_torrent * tor )
1415	{
1416	tr_completeness completeness;
1417
1418	assert( tr_isTorrent( tor ) );
1419
1420	tr_torrentLock( tor );
1421
1422	completeness = tr_cpGetStatus( &tor->completion );
1423
1424	if( completeness != tor->completeness )
1425	{
1426	const int recentChange = tor->downloadedCur != 0;
1427
1428	if( recentChange )
1429	{
1430	tr_torinf( tor, _( "State changed from \"%1$s\" to \"%2$s\"" ),
1431	getCompletionString( tor->completeness ),
1432	getCompletionString( completeness ) );
1433	}
1434
1435	tor->completeness = completeness;
1436	tr_torrentCloseLocalFiles( tor );
1437	fireCompletenessChange( tor, completeness );
1438
1439	if( recentChange && ( completeness == TR_SEED ) )
1440	{
1441	tr_trackerCompleted( tor->tracker );
1442
1443	tor->doneDate = time( NULL );
1444	}
1445
1446	tr_torrentSaveResume( tor );
1447	}
1448
1449	tr_torrentUnlock( tor );
1450	}
1451
1452	/**
1453	*** File priorities
1454	**/
1455
1456	void
1457	tr_torrentInitFilePriority( tr_torrent * tor,
1458	tr_file_index_t fileIndex,
1459	tr_priority_t priority )
1460	{
1461	tr_piece_index_t i;
1462	tr_file * file;
1463
1464	assert( tr_isTorrent( tor ) );
1465	assert( fileIndex < tor->info.fileCount );
1466	assert( priority == TR_PRI_LOW \|\| priority == TR_PRI_NORMAL \|\| priority == TR_PRI_HIGH );
1467
1468	file = &tor->info.files[fileIndex];
1469	file->priority = priority;
1470	for( i = file->firstPiece; i <= file->lastPiece; ++i )
1471	tor->info.pieces[i].priority = calculatePiecePriority( tor, i,
1472	fileIndex );
1473	}
1474
1475	void
1476	tr_torrentSetFilePriorities( tr_torrent * tor,
1477	tr_file_index_t * files,
1478	tr_file_index_t fileCount,
1479	tr_priority_t priority )
1480	{
1481	tr_file_index_t i;
1482
1483	assert( tr_isTorrent( tor ) );
1484
1485	tr_torrentLock( tor );
1486
1487	for( i = 0; i < fileCount; ++i )
1488	tr_torrentInitFilePriority( tor, files[i], priority );
1489
1490	tr_torrentSaveResume( tor );
1491	tr_torrentUnlock( tor );
1492	}
1493
1494	tr_priority_t
1495	tr_torrentGetFilePriority( const tr_torrent * tor,
1496	tr_file_index_t file )
1497	{
1498	tr_priority_t ret;
1499
1500	assert( tr_isTorrent( tor ) );
1501
1502	tr_torrentLock( tor );
1503	assert( tor );
1504	assert( file < tor->info.fileCount );
1505	ret = tor->info.files[file].priority;
1506	tr_torrentUnlock( tor );
1507
1508	return ret;
1509	}
1510
1511	tr_priority_t*
1512	tr_torrentGetFilePriorities( const tr_torrent * tor )
1513	{
1514	tr_file_index_t i;
1515	tr_priority_t * p;
1516
1517	assert( tr_isTorrent( tor ) );
1518
1519	tr_torrentLock( tor );
1520	p = tr_new0( tr_priority_t, tor->info.fileCount );
1521	for( i = 0; i < tor->info.fileCount; ++i )
1522	p[i] = tor->info.files[i].priority;
1523	tr_torrentUnlock( tor );
1524
1525	return p;
1526	}
1527
1528	/**
1529	*** File DND
1530	**/
1531
1532	int
1533	tr_torrentGetFileDL( const tr_torrent * tor,
1534	tr_file_index_t file )
1535	{
1536	int doDownload;
1537
1538	assert( tr_isTorrent( tor ) );
1539
1540	tr_torrentLock( tor );
1541
1542	assert( file < tor->info.fileCount );
1543	doDownload = !tor->info.files[file].dnd;
1544
1545	tr_torrentUnlock( tor );
1546	return doDownload != 0;
1547	}
1548
1549	static void
1550	setFileDND( tr_torrent * tor, tr_file_index_t fileIndex, int doDownload )
1551	{
1552	tr_file * file;
1553	const int dnd = !doDownload;
1554	tr_piece_index_t firstPiece, firstPieceDND;
1555	tr_piece_index_t lastPiece, lastPieceDND;
1556	tr_file_index_t i;
1557
1558	assert( tr_isTorrent( tor ) );
1559
1560	file = &tor->info.files[fileIndex];
1561	file->dnd = dnd;
1562	firstPiece = file->firstPiece;
1563	lastPiece = file->lastPiece;
1564
1565	/* can't set the first piece to DND unless
1566	every file using that piece is DND */
1567	firstPieceDND = dnd;
1568	if( fileIndex > 0 )
1569	{
1570	for( i = fileIndex - 1; firstPieceDND; --i )
1571	{
1572	if( tor->info.files[i].lastPiece != firstPiece )
1573	break;
1574	firstPieceDND = tor->info.files[i].dnd;
1575	if( !i )
1576	break;
1577	}
1578	}
1579
1580	/* can't set the last piece to DND unless
1581	every file using that piece is DND */
1582	lastPieceDND = dnd;
1583	for( i = fileIndex + 1; lastPieceDND && i < tor->info.fileCount; ++i )
1584	{
1585	if( tor->info.files[i].firstPiece != lastPiece )
1586	break;
1587	lastPieceDND = tor->info.files[i].dnd;
1588	}
1589
1590	if( firstPiece == lastPiece )
1591	{
1592	tor->info.pieces[firstPiece].dnd = firstPieceDND && lastPieceDND;
1593	}
1594	else
1595	{
1596	tr_piece_index_t pp;
1597	tor->info.pieces[firstPiece].dnd = firstPieceDND;
1598	tor->info.pieces[lastPiece].dnd = lastPieceDND;
1599	for( pp = firstPiece + 1; pp < lastPiece; ++pp )
1600	tor->info.pieces[pp].dnd = dnd;
1601	}
1602	}
1603
1604	void
1605	tr_torrentInitFileDLs( tr_torrent * tor,
1606	tr_file_index_t * files,
1607	tr_file_index_t fileCount,
1608	tr_bool doDownload )
1609	{
1610	tr_file_index_t i;
1611
1612	assert( tr_isTorrent( tor ) );
1613
1614	tr_torrentLock( tor );
1615
1616	for( i=0; i<fileCount; ++i )
1617	setFileDND( tor, files[i], doDownload );
1618	tr_cpInvalidateDND( &tor->completion );
1619	tr_torrentCheckSeedRatio( tor );
1620
1621	tr_torrentUnlock( tor );
1622	}
1623
1624	void
1625	tr_torrentSetFileDLs( tr_torrent * tor,
1626	tr_file_index_t * files,
1627	tr_file_index_t fileCount,
1628	tr_bool doDownload )
1629	{
1630	assert( tr_isTorrent( tor ) );
1631
1632	tr_torrentLock( tor );
1633	tr_torrentInitFileDLs( tor, files, fileCount, doDownload );
1634	tr_torrentSaveResume( tor );
1635	tr_torrentUnlock( tor );
1636	}
1637
1638	/***
1639	****
1640	***/
1641
1642	void
1643	tr_torrentSetPeerLimit( tr_torrent * tor,
1644	uint16_t maxConnectedPeers )
1645	{
1646	assert( tr_isTorrent( tor ) );
1647
1648	tor->maxConnectedPeers = maxConnectedPeers;
1649	}
1650
1651	uint16_t
1652	tr_torrentGetPeerLimit( const tr_torrent * tor )
1653	{
1654	assert( tr_isTorrent( tor ) );
1655
1656	return tor->maxConnectedPeers;
1657	}
1658
1659	/***
1660	****
1661	***/
1662
1663	tr_block_index_t
1664	_tr_block( const tr_torrent * tor,
1665	tr_piece_index_t index,
1666	uint32_t offset )
1667	{
1668	tr_block_index_t ret;
1669
1670	assert( tr_isTorrent( tor ) );
1671
1672	ret = index;
1673	ret *= ( tor->info.pieceSize / tor->blockSize );
1674	ret += offset / tor->blockSize;
1675	return ret;
1676	}
1677
1678	tr_bool
1679	tr_torrentReqIsValid( const tr_torrent * tor,
1680	tr_piece_index_t index,
1681	uint32_t offset,
1682	uint32_t length )
1683	{
1684	int err = 0;
1685
1686	assert( tr_isTorrent( tor ) );
1687
1688	if( index >= tor->info.pieceCount )
1689	err = 1;
1690	else if( length < 1 )
1691	err = 2;
1692	else if( ( offset + length ) > tr_torPieceCountBytes( tor, index ) )
1693	err = 3;
1694	else if( length > MAX_BLOCK_SIZE )
1695	err = 4;
1696	else if( tr_pieceOffset( tor, index, offset, length ) > tor->info.totalSize )
1697	err = 5;
1698
1699	if( err ) fprintf( stderr, "index %lu offset %lu length %lu err %d\n",
1700	(unsigned long)index, (unsigned long)offset,
1701	(unsigned long)length,
1702	err );
1703
1704	return !err;
1705	}
1706
1707	uint64_t
1708	tr_pieceOffset( const tr_torrent * tor,
1709	tr_piece_index_t index,
1710	uint32_t offset,
1711	uint32_t length )
1712	{
1713	uint64_t ret;
1714
1715	assert( tr_isTorrent( tor ) );
1716
1717	ret = tor->info.pieceSize;
1718	ret *= index;
1719	ret += offset;
1720	ret += length;
1721	return ret;
1722	}
1723
1724	/***
1725	****
1726	***/
1727
1728	void
1729	tr_torrentSetPieceChecked( tr_torrent * tor,
1730	tr_piece_index_t piece,
1731	tr_bool isChecked )
1732	{
1733	assert( tr_isTorrent( tor ) );
1734
1735	if( isChecked )
1736	tr_bitfieldAdd( &tor->checkedPieces, piece );
1737	else
1738	tr_bitfieldRem( &tor->checkedPieces, piece );
1739	}
1740
1741	void
1742	tr_torrentSetFileChecked( tr_torrent * tor,
1743	tr_file_index_t fileIndex,
1744	tr_bool isChecked )
1745	{
1746	const tr_file * file = &tor->info.files[fileIndex];
1747	const tr_piece_index_t begin = file->firstPiece;
1748	const tr_piece_index_t end = file->lastPiece + 1;
1749
1750	assert( tr_isTorrent( tor ) );
1751
1752	if( isChecked )
1753	tr_bitfieldAddRange( &tor->checkedPieces, begin, end );
1754	else
1755	tr_bitfieldRemRange( &tor->checkedPieces, begin, end );
1756	}
1757
1758	tr_bool
1759	tr_torrentIsFileChecked( const tr_torrent * tor,
1760	tr_file_index_t fileIndex )
1761	{
1762	const tr_file * file = &tor->info.files[fileIndex];
1763	const tr_piece_index_t begin = file->firstPiece;
1764	const tr_piece_index_t end = file->lastPiece + 1;
1765	tr_piece_index_t i;
1766	tr_bool isChecked = TRUE;
1767
1768	assert( tr_isTorrent( tor ) );
1769
1770	for( i = begin; isChecked && i < end; ++i )
1771	if( !tr_torrentIsPieceChecked( tor, i ) )
1772	isChecked = FALSE;
1773
1774	return isChecked;
1775	}
1776
1777	void
1778	tr_torrentUncheck( tr_torrent * tor )
1779	{
1780	assert( tr_isTorrent( tor ) );
1781
1782	tr_bitfieldRemRange( &tor->checkedPieces, 0, tor->info.pieceCount );
1783	}
1784
1785	int
1786	tr_torrentCountUncheckedPieces( const tr_torrent * tor )
1787	{
1788	assert( tr_isTorrent( tor ) );
1789
1790	return tor->info.pieceCount - tr_bitfieldCountTrueBits( &tor->checkedPieces );
1791	}
1792
1793	time_t*
1794	tr_torrentGetMTimes( const tr_torrent * tor,
1795	size_t * setme_n )
1796	{
1797	size_t i;
1798	const size_t n = tor->info.fileCount;
1799	time_t * m = tr_new0( time_t, n );
1800
1801	assert( tr_isTorrent( tor ) );
1802
1803	for( i = 0; i < n; ++i )
1804	{
1805	struct stat sb;
1806	char * path = tr_buildPath( tor->downloadDir, tor->info.files[i].name, NULL );
1807	if( !stat( path, &sb ) )
1808	{
1809	#ifdef SYS_DARWIN
1810	m[i] = sb.st_mtimespec.tv_sec;
1811	#else
1812	m[i] = sb.st_mtime;
1813	#endif
1814	}
1815	tr_free( path );
1816	}
1817
1818	*setme_n = n;
1819	return m;
1820	}
1821
1822	/***
1823	****
1824	***/
1825
1826	void
1827	tr_torrentSetAnnounceList( tr_torrent * tor,
1828	const tr_tracker_info * trackers,
1829	int trackerCount )
1830	{
1831	tr_benc metainfo;
1832
1833	assert( tr_isTorrent( tor ) );
1834
1835	/* save to the .torrent file */
1836	if( !tr_bencLoadFile( tor->info.torrent, &metainfo ) )
1837	{
1838	int i;
1839	int prevTier = -1;
1840	tr_benc * tier = NULL;
1841	tr_benc * announceList;
1842	tr_info tmpInfo;
1843
1844	/* remove the old fields */
1845	tr_bencDictRemove( &metainfo, "announce" );
1846	tr_bencDictRemove( &metainfo, "announce-list" );
1847
1848	/* add the new fields */
1849	tr_bencDictAddStr( &metainfo, "announce", trackers[0].announce );
1850	announceList = tr_bencDictAddList( &metainfo, "announce-list", 0 );
1851	for( i = 0; i < trackerCount; ++i ) {
1852	if( prevTier != trackers[i].tier ) {
1853	prevTier = trackers[i].tier;
1854	tier = tr_bencListAddList( announceList, 0 );
1855	}
1856	tr_bencListAddStr( tier, trackers[i].announce );
1857	}
1858
1859	/* try to parse it back again, to make sure it's good */
1860	memset( &tmpInfo, 0, sizeof( tr_info ) );
1861	if( !tr_metainfoParse( tor->session, &tmpInfo, &metainfo ) )
1862	{
1863	/* it's good, so keep these new trackers and free the old ones */
1864
1865	tr_info swap;
1866	swap.trackers = tor->info.trackers;
1867	swap.trackerCount = tor->info.trackerCount;
1868	tor->info.trackers = tmpInfo.trackers;
1869	tor->info.trackerCount = tmpInfo.trackerCount;
1870	tmpInfo.trackers = swap.trackers;
1871	tmpInfo.trackerCount = swap.trackerCount;
1872
1873	tr_metainfoFree( &tmpInfo );
1874	tr_bencSaveFile( tor->info.torrent, &metainfo );
1875	}
1876
1877	/* cleanup */
1878	tr_bencFree( &metainfo );
1879	}
1880	}
1881
1882	/**
1883	***
1884	**/
1885
1886	/** @deprecated this method will be removed in 1.40 */
1887	void
1888	tr_torrentSetAddedDate( tr_torrent * tor,
1889	time_t t )
1890	{
1891	assert( tr_isTorrent( tor ) );
1892
1893	tor->addedDate = t;
1894	}
1895
1896	/** @deprecated this method will be removed in 1.40 */
1897	void
1898	tr_torrentSetActivityDate( tr_torrent * tor,
1899	time_t t )
1900	{
1901	assert( tr_isTorrent( tor ) );
1902
1903	tor->activityDate = t;
1904	}
1905
1906	/** @deprecated this method will be removed in 1.40 */
1907	void
1908	tr_torrentSetDoneDate( tr_torrent * tor,
1909	time_t t )
1910	{
1911	assert( tr_isTorrent( tor ) );
1912
1913	tor->doneDate = t;
1914	}
1915
1916	/**
1917	***
1918	**/
1919
1920	uint64_t
1921	tr_torrentGetBytesLeftToAllocate( const tr_torrent * tor )
1922	{
1923	const tr_file * it;
1924	const tr_file * end;
1925	struct stat sb;
1926	uint64_t bytesLeft = 0;
1927
1928	assert( tr_isTorrent( tor ) );
1929
1930	for( it=tor->info.files, end=it+tor->info.fileCount; it!=end; ++it )
1931	{
1932	if( !it->dnd )
1933	{
1934	char * path = tr_buildPath( tor->downloadDir, it->name, NULL );
1935
1936	bytesLeft += it->length;
1937
1938	if( !stat( path, &sb )
1939	&& S_ISREG( sb.st_mode )
1940	&& ( (uint64_t)sb.st_size <= it->length ) )
1941	bytesLeft -= sb.st_size;
1942
1943	tr_free( path );
1944	}
1945	}
1946
1947	return bytesLeft;
1948	}
1949
1950	/****
1951	***** Removing the torrent's local data
1952	****/
1953
1954	static int
1955	vstrcmp( const void * a, const void * b )
1956	{
1957	return strcmp( a, b );
1958	}
1959
1960	static int
1961	compareLongestFirst( const void * a, const void * b )
1962	{
1963	const size_t alen = strlen( a );
1964	const size_t blen = strlen( b );
1965
1966	if( alen != blen )
1967	return alen > blen ? -1 : 1;
1968
1969	return vstrcmp( a, b );
1970	}
1971
1972	static void
1973	addDirtyFile( const char * root,
1974	const char * filename,
1975	tr_ptrArray * dirtyFolders )
1976	{
1977	char * dir = tr_dirname( filename );
1978
1979	/* add the parent folders to dirtyFolders until we reach the root or a known-dirty */
1980	while ( ( dir != NULL )
1981	&& ( strlen( root ) <= strlen( dir ) )
1982	&& ( tr_ptrArrayFindSorted( dirtyFolders, dir, vstrcmp ) == NULL ) )
1983	{
1984	char * tmp;
1985	tr_ptrArrayInsertSorted( dirtyFolders, tr_strdup( dir ), vstrcmp );
1986
1987	tmp = tr_dirname( dir );
1988	tr_free( dir );
1989	dir = tmp;
1990	}
1991
1992	tr_free( dir );
1993	}
1994
1995	static void
1996	walkLocalData( const tr_torrent * tor,
1997	const char * root,
1998	const char * dir,
1999	const char * base,
2000	tr_ptrArray * torrentFiles,
2001	tr_ptrArray * folders,
2002	tr_ptrArray * dirtyFolders )
2003	{
2004	int i;
2005	struct stat sb;
2006	char * buf;
2007
2008	assert( tr_isTorrent( tor ) );
2009
2010	buf = tr_buildPath( dir, base, NULL );
2011	i = stat( buf, &sb );
2012	if( !i )
2013	{
2014	DIR * odir = NULL;
2015
2016	if( S_ISDIR( sb.st_mode ) && ( ( odir = opendir ( buf ) ) ) )
2017	{
2018	struct dirent *d;
2019	tr_ptrArrayInsertSorted( folders, tr_strdup( buf ), vstrcmp );
2020	for( d = readdir( odir ); d != NULL; d = readdir( odir ) )
2021	if( d->d_name && d->d_name[0] != '.' ) /* skip dotfiles */
2022	walkLocalData( tor, root, buf, d->d_name, torrentFiles, folders, dirtyFolders );
2023	closedir( odir );
2024	}
2025	else if( S_ISREG( sb.st_mode ) && ( sb.st_size > 0 ) )
2026	{
2027	const char * sub = buf + strlen( tor->downloadDir ) + strlen( TR_PATH_DELIMITER_STR );
2028	const tr_bool isTorrentFile = tr_ptrArrayFindSorted( torrentFiles, sub, vstrcmp ) != NULL;
2029	if( !isTorrentFile )
2030	addDirtyFile( root, buf, dirtyFolders );
2031	}
2032	}
2033
2034	tr_free( buf );
2035	}
2036
2037	static void
2038	deleteLocalData( tr_torrent * tor, tr_fileFunc fileFunc )
2039	{
2040	int i, n;
2041	char ** s;
2042	tr_file_index_t f;
2043	tr_ptrArray torrentFiles = TR_PTR_ARRAY_INIT;
2044	tr_ptrArray folders = TR_PTR_ARRAY_INIT;
2045	tr_ptrArray dirtyFolders = TR_PTR_ARRAY_INIT; /* dirty == contains non-torrent files */
2046
2047	const char * firstFile = tor->info.files[0].name;
2048	const char * cpch = strchr( firstFile, TR_PATH_DELIMITER );
2049	char * tmp = cpch ? tr_strndup( firstFile, cpch - firstFile ) : NULL;
2050	char * root = tr_buildPath( tor->downloadDir, tmp, NULL );
2051
2052	assert( tr_isTorrent( tor ) );
2053
2054	for( f=0; f<tor->info.fileCount; ++f )
2055	tr_ptrArrayInsertSorted( &torrentFiles, tor->info.files[f].name, vstrcmp );
2056
2057	/* build the set of folders and dirtyFolders */
2058	walkLocalData( tor, root, root, NULL, &torrentFiles, &folders, &dirtyFolders );
2059
2060	/* try to remove entire folders first, so that the recycle bin will be tidy */
2061	s = (char**) tr_ptrArrayPeek( &folders, &n );
2062	for( i=0; i<n; ++i )
2063	if( tr_ptrArrayFindSorted( &dirtyFolders, s[i], vstrcmp ) == NULL )
2064	fileFunc( s[i] );
2065
2066	/* now blow away any remaining torrent files, such as torrent files in dirty folders */
2067	for( f=0; f<tor->info.fileCount; ++f ) {
2068	char * path = tr_buildPath( tor->downloadDir, tor->info.files[f].name, NULL );
2069	fileFunc( path );
2070	tr_free( path );
2071	}
2072
2073	/* Now clean out the directories left empty from the previous step.
2074	* Work from deepest to shallowest s.t. lower folders
2075	* won't prevent the upper folders from being deleted */
2076	{
2077	tr_ptrArray cleanFolders = TR_PTR_ARRAY_INIT;
2078	s = (char**) tr_ptrArrayPeek( &folders, &n );
2079	for( i=0; i<n; ++i )
2080	if( tr_ptrArrayFindSorted( &dirtyFolders, s[i], vstrcmp ) == NULL )
2081	tr_ptrArrayInsertSorted( &cleanFolders, s[i], compareLongestFirst );
2082	s = (char**) tr_ptrArrayPeek( &cleanFolders, &n );
2083	for( i=0; i<n; ++i )
2084	fileFunc( s[i] );
2085	tr_ptrArrayDestruct( &cleanFolders, NULL );
2086	}
2087
2088	/* cleanup */
2089	tr_ptrArrayDestruct( &dirtyFolders, tr_free );
2090	tr_ptrArrayDestruct( &folders, tr_free );
2091	tr_ptrArrayDestruct( &torrentFiles, NULL );
2092	tr_free( root );
2093	tr_free( tmp );
2094	}
2095
2096	void
2097	tr_torrentDeleteLocalData( tr_torrent * tor, tr_fileFunc fileFunc )
2098	{
2099	assert( tr_isTorrent( tor ) );
2100
2101	if( fileFunc == NULL )
2102	fileFunc = remove;
2103
2104	/* close all the files because we're about to delete them */
2105	tr_torrentCloseLocalFiles( tor );
2106
2107	if( tor->info.fileCount > 1 )
2108	deleteLocalData( tor, fileFunc );
2109	else {
2110	/* torrent only has one file */
2111	char * path = tr_buildPath( tor->downloadDir, tor->info.files[0].name, NULL );
2112	fileFunc( path );
2113	tr_free( path );
2114	}
2115	}
2116
2117	/***
2118	****
2119	***/
2120
2121	void
2122	tr_torrentCheckSeedRatio( tr_torrent * tor )
2123	{
2124	double seedRatio;
2125
2126	assert( tr_isTorrent( tor ) );
2127
2128	/* if we're seeding and we've reached our seed ratio limit, stop the torrent */
2129	if( tr_torrentIsSeed( tor ) && tr_torrentGetSeedRatio( tor, &seedRatio ) )
2130	{
2131	const double up = tor->uploadedCur + tor->uploadedPrev;
2132	const double down = tor->downloadedCur + tor->downloadedPrev;
2133	const double ratio = tr_getRatio( up, down );
2134	if( ratio >= seedRatio )
2135	{
2136	tr_torrentStop( tor );
2137
2138	/* set to no ratio limit to allow easy restarting */
2139	tr_torrentSetRatioMode( tor, TR_RATIOLIMIT_UNLIMITED );
2140
2141	/* maybe notify the client */
2142	if( tor->ratio_limit_hit_func != NULL )
2143	tor->ratio_limit_hit_func( tor, tor->ratio_limit_hit_func_user_data );
2144
2145	}
2146	}
2147	}

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