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Diffstat (limited to 'libktorrent/torrent/chunk.h')
| -rw-r--r-- | libktorrent/torrent/chunk.h | 165 |
1 files changed, 165 insertions, 0 deletions
diff --git a/libktorrent/torrent/chunk.h b/libktorrent/torrent/chunk.h new file mode 100644 index 0000000..0896e96 --- /dev/null +++ b/libktorrent/torrent/chunk.h @@ -0,0 +1,165 @@ +/*************************************************************************** + * Copyright (C) 2005 by Joris Guisson * + * joris.guisson@gmail.com * + * * + * This program is free software; you can redistribute it and/or modify * + * it under the terms of the GNU General Public License as published by * + * the Free Software Foundation; either version 2 of the License, or * + * (at your option) any later version. * + * * + * This program is distributed in the hope that it will be useful, * + * but WITHOUT ANY WARRANTY; without even the implied warranty of * + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * + * GNU General Public License for more details. * + * * + * You should have received a copy of the GNU General Public License * + * along with this program; if not, write to the * + * Free Software Foundation, Inc., * + * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * + ***************************************************************************/ +#ifndef BTCHUNK_H +#define BTCHUNK_H + +#include <util/constants.h> +#include "cachefile.h" + +namespace bt +{ + class SHA1Hash; + + /** + * @author Joris Guisson + * @brief Keep track of a piece of the file + * + * Keeps track of a piece of the file. The Chunk has 3 possible states : + * - MMAPPED : It is memory mapped + * - BUFFERED : It is in a buffer in dynamically allocated memory + * (because the chunk is located in 2 or more separate files, so we cannot just set a pointer + * to a region of mmapped memory) + * - ON_DISK : On disk + * - NOT_DOWNLOADED : It hasn't been dowloaded yet, and there is no buffer allocated + */ + class Chunk : public MMappeable + { + public: + Chunk(unsigned int index,Uint32 size); + ~Chunk(); + + enum Status + { + MMAPPED, + BUFFERED, + ON_DISK, + NOT_DOWNLOADED + }; + + /// Get the chunks status. + Status getStatus() const; + + /** + * Set the chunks status + * @param s + */ + void setStatus(Status s); + + /// Get the data + const Uint8* getData() const; + + /// Get the data + Uint8* getData(); + + /// Set the data and the new status + void setData(Uint8* d,Status nstatus); + + /// Clear the chunk (delete data depending on the mode) + void clear(); + + /// Get the chunk's index + Uint32 getIndex() const; + + /// Get the chunk's size + Uint32 getSize() const; + + /// Add one to the reference counter + void ref(); + + /// --reference counter + void unref(); + + /// reference coun > 0 + bool taken() const; + + /// allocate data if not already done, sets the status to buffered + void allocate(); + + /// get chunk priority + Priority getPriority() const; + + /// set chunk priority + void setPriority(Priority newpriority = NORMAL_PRIORITY); + + /// Is chunk excluded + bool isExcluded() const; + + /// Is this a seed only chunk + bool isExcludedForDownloading() const; + + /// In/Exclude chunk + void setExclude(bool yes); + + /** + * Check wehter the chunk matches it's hash. + * @param h The hash + * @return true if the data matches the hash + */ + bool checkHash(const SHA1Hash & h) const; + + private: + virtual void unmapped(); + + private: + Status status; + Uint32 index; + Uint8* data; + Uint32 size; + int ref_count; + Priority priority; + }; + + inline Chunk::Status Chunk::getStatus() const + { + return status; + } + + inline void Chunk::setStatus(Chunk::Status s) + { + status = s; + } + + inline const Uint8* Chunk::getData() const {return data;} + inline Uint8* Chunk::getData() {return data;} + + inline Uint32 Chunk::getIndex() const {return index;} + inline Uint32 Chunk::getSize() const {return size;} + + inline void Chunk::ref() {ref_count++;} + inline void Chunk::unref() {ref_count--;} + inline bool Chunk::taken() const {return ref_count > 0;} + + inline Priority Chunk::getPriority() const {return priority;} + inline void Chunk::setPriority(Priority newpriority) {priority = newpriority;} + inline bool Chunk::isExcluded() const + { + return priority == EXCLUDED; + } + + inline bool Chunk::isExcludedForDownloading() const + { + return priority == ONLY_SEED_PRIORITY; + } + + inline void Chunk::setExclude(bool yes) + {if(yes) priority = EXCLUDED; else priority = NORMAL_PRIORITY;} +} + +#endif |