109 lines
3.5 KiB
C++
109 lines
3.5 KiB
C++
/*
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Copyright (c) 2012-2018, Arvid Norberg, Daniel Wallin
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TORRENT_STAT_CACHE_HPP
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#define TORRENT_STAT_CACHE_HPP
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#include <vector>
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#include <string>
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#include <cstdint>
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#include <mutex>
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#include "libtorrent/config.hpp"
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#include "libtorrent/error_code.hpp"
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#include "libtorrent/file_storage.hpp"
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#include "libtorrent/units.hpp"
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#include "libtorrent/aux_/vector.hpp"
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namespace libtorrent {
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struct TORRENT_EXTRA_EXPORT stat_cache
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{
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stat_cache();
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~stat_cache();
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void reserve(int num_files);
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// returns the size of the file unless an error occurs, in which case ec
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// is set to indicate the error
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std::int64_t get_filesize(file_index_t i, file_storage const& fs
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, std::string const& save_path, error_code& ec);
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void set_dirty(file_index_t i);
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void clear();
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// internal
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enum
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{
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not_in_cache = -1,
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file_error = -2 // (first index in m_errors)
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};
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// internal
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void set_cache(file_index_t i, std::int64_t size);
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void set_error(file_index_t i, error_code const& ec);
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private:
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void set_cache_impl(file_index_t i, std::int64_t size);
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void set_error_impl(file_index_t i, error_code const& ec);
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// returns the index to the specified error. Either an existing one or a
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// newly added entry
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int add_error(error_code const& ec);
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struct stat_cache_t
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{
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explicit stat_cache_t(std::int64_t s): file_size(s) {}
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// the size of the file. Negative values have special meaning. -1 means
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// not-in-cache (i.e. there's no data for this file in the cache).
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// lower values (larger negative values) indicate that an error
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// occurred while stat()ing the file. The positive value is an index
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// into m_errors, that recorded the actual error.
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std::int64_t file_size;
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};
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mutable std::mutex m_mutex;
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// one entry per file
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aux::vector<stat_cache_t, file_index_t> m_stat_cache;
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// These are the errors that have happened when stating files. Each entry
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// that had an error, refers to an index into this vector.
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std::vector<error_code> m_errors;
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};
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}
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#endif // TORRENT_STAT_CACHE_HPP
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