forked from premiere/premiere-libtorrent
119 lines
4.0 KiB
C++
119 lines
4.0 KiB
C++
/*
|
|
|
|
Copyright (c) 2012-2016, Arvid Norberg
|
|
All rights reserved.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions
|
|
are met:
|
|
|
|
* Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
* Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the distribution.
|
|
* Neither the name of the author nor the names of its
|
|
contributors may be used to endorse or promote products derived
|
|
from this software without specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
*/
|
|
|
|
#include "libtorrent/aux_/disable_warnings_push.hpp"
|
|
|
|
#include <string>
|
|
#include <vector>
|
|
#include <mutex>
|
|
#include <boost/unordered_map.hpp>
|
|
#include <boost/cstdint.hpp>
|
|
|
|
#include "libtorrent/aux_/disable_warnings_pop.hpp"
|
|
|
|
#include "libtorrent/config.hpp"
|
|
#include "libtorrent/file.hpp"
|
|
#include "libtorrent/error_code.hpp"
|
|
|
|
namespace libtorrent
|
|
{
|
|
struct TORRENT_EXTRA_EXPORT part_file
|
|
{
|
|
// create a part file at 'path', that can hold 'num_pieces' pieces.
|
|
// each piece being 'piece_size' number of bytes
|
|
part_file(std::string const& path, std::string const& name, int num_pieces, int piece_size);
|
|
~part_file();
|
|
|
|
int writev(file::iovec_t const* bufs, int num_bufs, int piece, int offset, error_code& ec);
|
|
int readv(file::iovec_t const* bufs, int num_bufs, int piece, int offset, error_code& ec);
|
|
|
|
// free the slot the given piece is stored in. We no longer need to store this
|
|
// piece in the part file
|
|
void free_piece(int piece);
|
|
|
|
void move_partfile(std::string const& path, error_code& ec);
|
|
|
|
void import_file(file& f, boost::int64_t offset, boost::int64_t size, error_code& ec);
|
|
void export_file(file& f, boost::int64_t offset, boost::int64_t size, error_code& ec);
|
|
|
|
// flush the metadata
|
|
void flush_metadata(error_code& ec);
|
|
|
|
private:
|
|
|
|
void open_file(int mode, error_code& ec);
|
|
void flush_metadata_impl(error_code& ec);
|
|
|
|
std::string m_path;
|
|
std::string m_name;
|
|
|
|
// allocate a slot and return the slot index
|
|
int allocate_slot(int piece);
|
|
|
|
// this mutex must be held while accessing the data
|
|
// structure. Not while reading or writing from the file though!
|
|
// it's important to support multithreading
|
|
std::mutex m_mutex;
|
|
|
|
// this is a list of unallocated slots in the part file
|
|
// within the m_num_allocated range
|
|
std::vector<int> m_free_slots;
|
|
|
|
// this is the number of slots allocated
|
|
int m_num_allocated;
|
|
|
|
// the max number of pieces in the torrent this part file is
|
|
// backing
|
|
int m_max_pieces;
|
|
|
|
// number of bytes each piece contains
|
|
int m_piece_size;
|
|
|
|
// this is the size of the part_file header, it is added
|
|
// to offsets when calculating the offset to read and write
|
|
// payload data from
|
|
int m_header_size;
|
|
|
|
// if this is true, the metadata in memory has changed since
|
|
// we last saved or read it from disk. It means that we
|
|
// need to flush the metadata before closing the file
|
|
bool m_dirty_metadata;
|
|
|
|
// maps a piece index to the part-file slot it is stored in
|
|
boost::unordered_map<int, int> m_piece_map;
|
|
|
|
// this is the file handle to the part file
|
|
file m_file;
|
|
};
|
|
}
|
|
|