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369 lines
10 KiB
369 lines
10 KiB
/***************************************************************************
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* Copyright (C) 2005 by Joris Guisson *
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* joris.guisson@gmail.com *
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This program is distributed in the hope that it will be useful, *
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* but WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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* GNU General Public License for more details. *
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* *
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* You should have received a copy of the GNU General Public License *
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* along with this program; if not, write to the *
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* Free Software Foundation, Inc., *
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. *
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***************************************************************************/
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#ifndef BTCHUNKMANAGER_H
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#define BTCHUNKMANAGER_H
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#include <tqmap.h>
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#include <tqstring.h>
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#include <tqobject.h>
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#include <tqptrvector.h>
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#include <util/bitset.h>
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#include "chunk.h"
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#include "globals.h"
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class TQStringList;
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namespace KIO
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{
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class Job;
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}
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namespace bt
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{
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class Torrent;
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class Cache;
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class TorrentFile;
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class PreallocationThread;
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struct NewChunkHeader
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{
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unsigned int index; // the Chunks index
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unsigned int deprecated; // offset in cache file
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};
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/**
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* @author Joris Guisson
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*
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* Manages all Chunk's and the cache file, where all the chunk's are stored.
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* It also manages a separate index file, where the position of each piece
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* in the cache file is stored.
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*
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* The chunks are stored in the cache file in the correct order. Eliminating
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* the need for a file reconstruction algorithm for single files.
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*/
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class ChunkManager : public TQObject
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{
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Q_OBJECT
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Torrent & tor;
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TQString index_file,file_info_file,file_priority_file;
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TQPtrVector<Chunk> chunks;
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Cache* cache;
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TQMap<Uint32,TimeStamp> loaded; // loaded chunks and when they were loaded
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BitSet bitset;
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BitSet excluded_chunks;
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BitSet only_seed_chunks;
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BitSet todo;
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mutable Uint32 chunks_left;
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mutable bool recalc_chunks_left;
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Uint32 corrupted_count;
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Uint32 recheck_counter;
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bool during_load;
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public:
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ChunkManager(Torrent & tor,
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const TQString & tmpdir,
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const TQString & datadir,
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bool custom_output_name);
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virtual ~ChunkManager();
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/// Get the torrent
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const Torrent & getTorrent() const {return tor;}
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/// Get the data dir
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TQString getDataDir() const;
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/// Get the actual output path
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TQString getOutputPath() const;
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void changeOutputPath(const TQString& output_path);
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/// Remove obsolete chunks
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void checkMemoryUsage();
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/**
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* Change the data dir.
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* @param data_dir
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*/
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void changeDataDir(const TQString & data_dir);
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/**
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* Move the data files of the torrent.
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* @param ndir The new directory
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* @return The job doing the move
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*/
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KIO::Job* moveDataFiles(const TQString & ndir);
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/**
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* The move data files job has finished
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* @param job The move job
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*/
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void moveDataFilesCompleted(KIO::Job* job);
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/**
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* Loads the index file.
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* @throw Error When it can be loaded
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*/
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void loadIndexFile();
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/**
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* Create the cache file, and index files.
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* @param check_priority Make sure chunk priorities and dnd status of files match
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* @throw Error When it can be created
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*/
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void createFiles(bool check_priority = false);
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/**
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* Test all files and see if they are not missing.
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* If so put them in a list
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*/
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bool hasMissingFiles(TQStringList & sl);
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/**
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* Preallocate diskspace for all files
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* @param prealloc The thread doing the preallocation
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*/
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void preallocateDiskSpace(PreallocationThread* prealloc);
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/**
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* Open the necessary files when the download gets started.
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*/
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void start();
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/**
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* Closes files when the download gets stopped.
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*/
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void stop();
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/**
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* Get's the i'th Chunk.
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* @param i The Chunk's index
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* @return The Chunk, or 0 when i is out of bounds
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*/
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Chunk* getChunk(unsigned int i);
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/**
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* Get's the i'th Chunk. Makes sure that the Chunk's data
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* is in memory. If the Chunk hasn't been downloaded yet 0
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* is returned. Whenever the Chunk needs to be uploaded, call
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* this function. This changes the status to MMAPPED or BUFFERED.
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* @param i The Chunk's index
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* @return The Chunk, or 0 when i is out of bounds
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*/
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Chunk* grabChunk(unsigned int i);
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/**
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* Prepare a chunk for downloading
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* @param c The Chunk
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* @param allways Always do this, even if the chunk is not NOT_DOWNLOADED
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* @return true if ok, false if the chunk is not NOT_DOWNLOADED
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*/
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bool prepareChunk(Chunk* c,bool allways = false);
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/**
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* The upload is done, and the Chunk is no longer needed.
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* The Chunk's data might be cleared, if we are using up to much
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* memory.
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* @param i The Chunk's index
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*/
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void releaseChunk(unsigned int i);
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/**
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* Reset a chunk as if it were never downloaded.
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* @param i The chunk
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*/
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void resetChunk(unsigned int i);
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/**
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* Save the i'th Chunk to the cache_file.
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* Also changes the Chunk's status to ON_DISK.
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* The Chunk's data is immediately cleared.
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* @param i The Chunk's index
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* @param update_index Update the index or not
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*/
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void saveChunk(unsigned int i,bool update_index = true);
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/**
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* Calculates the number of bytes left for the tracker. Does include
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* excluded chunks (this should be used for the tracker).
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* @return The number of bytes to download + the number of bytes excluded
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*/
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Uint64 bytesLeft() const;
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/**
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* Calculates the number of bytes left to download.
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*/
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Uint64 bytesLeftToDownload() const;
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/**
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* Calculates the number of bytes which have been excluded.
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* @return The number of bytes excluded
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*/
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Uint64 bytesExcluded() const;
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/**
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* Calculates the number of chunks left to download.
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* Does not include excluded chunks.
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* @return The number of chunks to download
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*/
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Uint32 chunksLeft() const;
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/**
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* Check if we have all chunks, this is not the same as
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* chunksLeft() == 0, it does not look at excluded chunks.
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* @return true if all chunks have been downloaded
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*/
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bool haveAllChunks() const;
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/**
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* Get the number of chunks which have been excluded.
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* @return The number of excluded chunks
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*/
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Uint32 chunksExcluded() const;
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/**
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* Get the number of downloaded chunks
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* @return
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*/
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Uint32 chunksDownloaded() const;
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/**
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* Get the number of only seed chunks.
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*/
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Uint32 onlySeedChunks() const;
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/**
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* Get a BitSet of the status of all Chunks
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*/
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const BitSet & getBitSet() const {return bitset;}
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/**
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* Get the excluded bitset
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*/
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const BitSet & getExcludedBitSet() const {return excluded_chunks;}
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/**
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* Get the only seed bitset.
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*/
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const BitSet & getOnlySeedBitSet() const {return only_seed_chunks;}
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/// Get the number of chunks into the file.
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Uint32 getNumChunks() const {return chunks.count();}
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/// Print memory usage to log file
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void debugPrintMemUsage();
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/**
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* Make sure that a range will get priority over other chunks.
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* @param from First chunk in range
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* @param to Last chunk in range
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*/
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void prioritise(Uint32 from,Uint32 to, Priority priority);
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/**
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* Make sure that a range will not be downloaded.
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* @param from First chunk in range
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* @param to Last chunk in range
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*/
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void exclude(Uint32 from,Uint32 to);
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/**
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* Make sure that a range will be downloaded.
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* Does the opposite of exclude.
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* @param from First chunk in range
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* @param to Last chunk in range
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*/
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void include(Uint32 from,Uint32 to);
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/**
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* Data has been checked, and these chunks are OK.
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* The ChunkManager will update it's internal structures
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* @param ok_chunks The ok_chunks
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*/
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void dataChecked(const BitSet & ok_chunks);
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/// Test if the torrent has existing files, only works the first time a torrent is loaded
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bool hasExistingFiles() const;
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/// Recreates missing files
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void recreateMissingFiles();
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/// Set missing files as do not download
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void dndMissingFiles();
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/// Delete all data files
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void deleteDataFiles();
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/// Are all not deselected chunks downloaded.
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bool completed() const;
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/// Set the maximum chunk size for a data check, 0 means alllways check
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static void setMaxChunkSizeForDataCheck(Uint32 mcs) {max_chunk_size_for_data_check = mcs;}
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/// Get the current disk usage of all the files in this torrent
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Uint64 diskUsage();
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signals:
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/**
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* Emitted when a range of chunks has been excluded
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* @param from First chunk in range
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* @param to Last chunk in range
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*/
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void excluded(Uint32 from,Uint32 to);
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/**
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* Emitted when a range of chunks has been included back.
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* @param from First chunk in range
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* @param to Last chunk in range
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*/
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void included(Uint32 from,Uint32 to);
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/**
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* Emitted when chunks get excluded or included, so
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* that the statistics can be updated.
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*/
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void updateStats();
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/**
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* A corrupted chunk has been found during uploading.
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* @param chunk The chunk
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*/
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void corrupted(Uint32 chunk);
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private:
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void saveIndexFile();
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void writeIndexFileEntry(Chunk* c);
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void saveFileInfo();
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void loadFileInfo();
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void savePriorityInfo();
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void loadPriorityInfo();
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private slots:
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void downloadStatusChanged(TorrentFile* tf,bool download);
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void downloadPriorityChanged(TorrentFile* tf,Priority newpriority,Priority oldpriority);
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private:
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static Uint32 max_chunk_size_for_data_check;
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};
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}
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#endif
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