forked from premiere/premiere-libtorrent
432 lines
13 KiB
C++
432 lines
13 KiB
C++
/*
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Copyright (c) 2003, Arvid Norberg
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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_STORAGE_HPP_INCLUDE
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#define TORRENT_STORAGE_HPP_INCLUDE
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#include <vector>
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#include <bitset>
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#ifdef _MSC_VER
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#pragma warning(push, 1)
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#endif
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#include <boost/limits.hpp>
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#include <boost/thread.hpp>
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#include <boost/shared_ptr.hpp>
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#include <boost/intrusive_ptr.hpp>
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#include <boost/filesystem/path.hpp>
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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#include "libtorrent/torrent_info.hpp"
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#include "libtorrent/piece_picker.hpp"
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#include "libtorrent/intrusive_ptr_base.hpp"
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#include "libtorrent/peer_request.hpp"
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#include "libtorrent/hasher.hpp"
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#include "libtorrent/config.hpp"
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#include "libtorrent/buffer.hpp"
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namespace libtorrent
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{
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namespace aux
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{
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struct piece_checker_data;
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}
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namespace fs = boost::filesystem;
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class session;
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struct file_pool;
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struct disk_io_job;
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struct disk_buffer_holder;
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enum storage_mode_t
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{
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storage_mode_allocate = 0,
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storage_mode_sparse,
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storage_mode_compact
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};
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#if defined(_WIN32) && defined(UNICODE)
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TORRENT_EXPORT std::wstring safe_convert(std::string const& s);
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#endif
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TORRENT_EXPORT std::vector<std::pair<size_type, std::time_t> > get_filesizes(
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file_storage const& t
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, fs::path p);
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TORRENT_EXPORT bool match_filesizes(
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file_storage const& t
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, fs::path p
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, std::vector<std::pair<size_type, std::time_t> > const& sizes
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, bool compact_mode
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, std::string* error = 0);
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struct TORRENT_EXPORT file_allocation_failed: std::exception
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{
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file_allocation_failed(const char* error_msg): m_msg(error_msg) {}
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virtual const char* what() const throw() { return m_msg.c_str(); }
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virtual ~file_allocation_failed() throw() {}
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std::string m_msg;
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};
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struct TORRENT_EXPORT partial_hash
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{
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partial_hash(): offset(0) {}
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// the number of bytes in the piece that has been hashed
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int offset;
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// the sha-1 context
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hasher h;
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};
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struct TORRENT_EXPORT storage_interface
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{
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// create directories and set file sizes
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// if allocate_files is true.
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// allocate_files is true if allocation mode
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// is set to full and sparse files are supported
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// false return value indicates an error
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virtual bool initialize(bool allocate_files) = 0;
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// negative return value indicates an error
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virtual int read(char* buf, int slot, int offset, int size) = 0;
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// negative return value indicates an error
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virtual int write(const char* buf, int slot, int offset, int size) = 0;
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// non-zero return value indicates an error
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virtual bool move_storage(fs::path save_path) = 0;
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// verify storage dependent fast resume entries
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virtual bool verify_resume_data(lazy_entry const& rd, std::string& error) = 0;
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// write storage dependent fast resume entries
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virtual bool write_resume_data(entry& rd) const = 0;
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// moves (or copies) the content in src_slot to dst_slot
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virtual bool move_slot(int src_slot, int dst_slot) = 0;
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// swaps the data in slot1 and slot2
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virtual bool swap_slots(int slot1, int slot2) = 0;
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// swaps the puts the data in slot1 in slot2, the data in slot2
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// in slot3 and the data in slot3 in slot1
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virtual bool swap_slots3(int slot1, int slot2, int slot3) = 0;
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// returns the sha1-hash for the data at the given slot
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virtual sha1_hash hash_for_slot(int slot, partial_hash& h, int piece_size) = 0;
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// this will close all open files that are opened for
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// writing. This is called when a torrent has finished
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// downloading.
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// non-zero return value indicates an error
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virtual bool release_files() = 0;
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// this will rename the file specified by index.
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virtual bool rename_file(int index, std::string const& new_filename) = 0;
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// this will close all open files and delete them
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// non-zero return value indicates an error
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virtual bool delete_files() = 0;
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void set_error(boost::filesystem::path const& file, error_code const& ec) const
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{
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m_error_file = file.string();
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m_error = ec;
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}
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error_code const& error() const { return m_error; }
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std::string const& error_file() const { return m_error_file; }
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void clear_error() { m_error = error_code(); m_error_file.clear(); }
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mutable error_code m_error;
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mutable std::string m_error_file;
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virtual ~storage_interface() {}
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};
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typedef storage_interface* (&storage_constructor_type)(
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file_storage const&, fs::path const&, file_pool&);
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TORRENT_EXPORT storage_interface* default_storage_constructor(
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file_storage const&, fs::path const&, file_pool&);
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TORRENT_EXPORT storage_interface* mapped_storage_constructor(
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file_storage const&, fs::path const&, file_pool&);
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struct disk_io_thread;
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class TORRENT_EXPORT piece_manager
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: public intrusive_ptr_base<piece_manager>
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, boost::noncopyable
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{
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friend class invariant_access;
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friend struct disk_io_thread;
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public:
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piece_manager(
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boost::shared_ptr<void> const& torrent
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, boost::intrusive_ptr<torrent_info const> info
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, fs::path const& path
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, file_pool& fp
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, disk_io_thread& io
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, storage_constructor_type sc
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, storage_mode_t sm);
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~piece_manager();
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boost::intrusive_ptr<torrent_info const> info() const { return m_info; }
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void write_resume_data(entry& rd) const;
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void async_check_fastresume(lazy_entry const* resume_data
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, boost::function<void(int, disk_io_job const&)> const& handler);
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void async_check_files(boost::function<void(int, disk_io_job const&)> const& handler);
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void async_rename_file(int index, std::string const& name
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, boost::function<void(int, disk_io_job const&)> const& handler);
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void async_read(
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peer_request const& r
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, boost::function<void(int, disk_io_job const&)> const& handler
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, int priority = 0);
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void async_write(
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peer_request const& r
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, disk_buffer_holder& buffer
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, boost::function<void(int, disk_io_job const&)> const& f);
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void async_hash(int piece, boost::function<void(int, disk_io_job const&)> const& f);
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void async_release_files(
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boost::function<void(int, disk_io_job const&)> const& handler
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= boost::function<void(int, disk_io_job const&)>());
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void abort_disk_io();
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void async_clear_read_cache(
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boost::function<void(int, disk_io_job const&)> const& handler
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= boost::function<void(int, disk_io_job const&)>());
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void async_delete_files(
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boost::function<void(int, disk_io_job const&)> const& handler
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= boost::function<void(int, disk_io_job const&)>());
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void async_move_storage(fs::path const& p
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, boost::function<void(int, disk_io_job const&)> const& handler);
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void async_save_resume_data(
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boost::function<void(int, disk_io_job const&)> const& handler);
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enum return_t
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{
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// return values from check_fastresume and check_files
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no_error = 0,
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need_full_check = -1,
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fatal_disk_error = -2,
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disk_check_aborted = -3
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};
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storage_interface* get_storage_impl() { return m_storage.get(); }
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private:
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fs::path save_path() const;
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bool verify_resume_data(lazy_entry const& rd, std::string& error)
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{ return m_storage->verify_resume_data(rd, error); }
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bool is_allocating() const
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{ return m_state == state_expand_pieces; }
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void mark_failed(int index);
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error_code const& error() const { return m_storage->error(); }
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std::string const& error_file() const { return m_storage->error_file(); }
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void clear_error() { m_storage->clear_error(); }
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int slot_for(int piece) const;
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int piece_for(int slot) const;
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// helper functions for check_dastresume
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int check_no_fastresume(std::string& error);
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int check_init_storage(std::string& error);
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// if error is set and return value is 'no_error' or 'need_full_check'
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// the error message indicates that the fast resume data was rejected
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// if 'fatal_disk_error' is returned, the error message indicates what
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// when wrong in the disk access
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int check_fastresume(lazy_entry const& rd, std::string& error);
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// this function returns true if the checking is complete
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int check_files(int& current_slot, int& have_piece, std::string& error);
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bool compact_allocation() const
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{ return m_storage_mode == storage_mode_compact; }
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#ifndef NDEBUG
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std::string name() const { return m_info->name(); }
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#endif
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bool allocate_slots(int num_slots, bool abort_on_disk = false);
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int read_impl(
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char* buf
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, int piece_index
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, int offset
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, int size);
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int write_impl(
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const char* buf
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, int piece_index
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, int offset
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, int size);
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// -1=error 0=ok 1=skip
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int check_one_piece(int& have_piece);
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int identify_data(
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const std::vector<char>& piece_data
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, int current_slot);
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void switch_to_full_mode();
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sha1_hash hash_for_piece_impl(int piece);
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int release_files_impl() { return m_storage->release_files(); }
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int delete_files_impl() { return m_storage->delete_files(); }
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int rename_file_impl(int index, std::string const& new_filename)
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{ return m_storage->rename_file(index, new_filename); }
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int move_storage_impl(fs::path const& save_path);
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int allocate_slot_for_piece(int piece_index);
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#ifndef NDEBUG
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void check_invariant() const;
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#ifdef TORRENT_STORAGE_DEBUG
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void debug_log() const;
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#endif
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#endif
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boost::intrusive_ptr<torrent_info const> m_info;
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file_storage const& m_files;
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boost::scoped_ptr<storage_interface> m_storage;
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storage_mode_t m_storage_mode;
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// slots that haven't had any file storage allocated
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std::vector<int> m_unallocated_slots;
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// slots that have file storage, but isn't assigned to a piece
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std::vector<int> m_free_slots;
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enum
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{
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has_no_slot = -3 // the piece has no storage
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};
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// maps piece indices to slots. If a piece doesn't
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// have any storage, it is set to 'has_no_slot'
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std::vector<int> m_piece_to_slot;
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enum
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{
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unallocated = -1, // the slot is unallocated
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unassigned = -2 // the slot is allocated but not assigned to a piece
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};
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// maps slots to piece indices, if a slot doesn't have a piece
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// it can either be 'unassigned' or 'unallocated'
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std::vector<int> m_slot_to_piece;
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fs::path m_save_path;
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mutable boost::recursive_mutex m_mutex;
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enum {
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// the default initial state
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state_none,
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// the file checking is complete
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state_finished,
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// checking the files
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state_full_check,
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// move pieces to their final position
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state_expand_pieces
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} m_state;
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int m_current_slot;
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// used during check. If any piece is found
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// that is not in its final position, this
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// is set to true
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bool m_out_of_place;
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// used to move pieces while expanding
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// the storage from compact allocation
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// to full allocation
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buffer m_scratch_buffer;
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buffer m_scratch_buffer2;
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// the piece that is in the scratch buffer
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int m_scratch_piece;
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// this is saved in case we need to instantiate a new
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// storage (osed when remapping files)
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storage_constructor_type m_storage_constructor;
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// temporary buffer used while checking
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std::vector<char> m_piece_data;
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// this maps a piece hash to piece index. It will be
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// build the first time it is used (to save time if it
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// isn't needed)
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std::multimap<sha1_hash, int> m_hash_to_piece;
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// this map contains partial hashes for downloading
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// pieces. This is only accessed from within the
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// disk-io thread.
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std::map<int, partial_hash> m_piece_hasher;
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disk_io_thread& m_io_thread;
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// the reason for this to be a void pointer
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// is to avoid creating a dependency on the
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// torrent. This shared_ptr is here only
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// to keep the torrent object alive until
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// the piece_manager destructs. This is because
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// the torrent_info object is owned by the torrent.
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boost::shared_ptr<void> m_torrent;
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};
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}
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#endif // TORRENT_STORAGE_HPP_INCLUDED
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