forked from premiere/premiere-libtorrent
593 lines
21 KiB
C++
593 lines
21 KiB
C++
/*
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Copyright (c) 2003-2014, 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_FILE_STORAGE_HPP_INCLUDED
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#define TORRENT_FILE_STORAGE_HPP_INCLUDED
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#include <string>
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#include <vector>
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#include <ctime>
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#include "libtorrent/size_type.hpp"
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#include "libtorrent/assert.hpp"
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#include "libtorrent/peer_request.hpp"
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#include "libtorrent/peer_id.hpp"
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namespace libtorrent
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{
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struct file;
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// information about a file in a file_storage
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struct TORRENT_EXPORT file_entry
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{
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// hidden
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file_entry();
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// hidden
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~file_entry();
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// the full path of this file. The paths are unicode strings
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// encoded in UTF-8.
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std::string path;
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// the path which this is a symlink to, or empty if this is
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// not a symlink. This field is only used if the ``symlink_attribute`` is set.
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std::string symlink_path;
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// the offset of this file inside the torrent
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size_type offset;
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// the size of the file (in bytes) and ``offset`` is the byte offset
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// of the file within the torrent. i.e. the sum of all the sizes of the files
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// before it in the list.
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size_type size;
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// the offset in the file where the storage should start. The normal
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// case is to have this set to 0, so that the storage starts saving data at the start
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// if the file. In cases where multiple files are mapped into the same file though,
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// the ``file_base`` should be set to an offset so that the different regions do
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// not overlap. This is used when mapping "unselected" files into a so-called part
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// file.
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size_type file_base;
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// the modification time of this file specified in posix time.
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std::time_t mtime;
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// a sha-1 hash of the content of the file, or zeroes, if no
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// file hash was present in the torrent file. It can be used to potentially
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// find alternative sources for the file.
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sha1_hash filehash;
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// set to true for files that are not part of the data of the torrent.
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// They are just there to make sure the next file is aligned to a particular byte offset
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// or piece boundry. These files should typically be hidden from an end user. They are
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// not written to disk.
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bool pad_file:1;
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// true if the file was marked as hidden (on windows).
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bool hidden_attribute:1;
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// true if the file was marked as executable (posix)
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bool executable_attribute:1;
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// true if the file was a symlink. If this is the case
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// the ``symlink_index`` refers to a string which specifies the original location
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// where the data for this file was found.
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bool symlink_attribute:1;
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};
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// only export this type if deprecated functions are enabled
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#ifdef TORRENT_NO_DEPRECATED
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#define TORRENT_DEPRECATED_EXPORT
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#else
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#define TORRENT_DEPRECATED_EXPORT TORRENT_EXPORT
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#endif
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// internal
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struct TORRENT_DEPRECATED_EXPORT internal_file_entry
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{
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friend class file_storage;
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#ifdef TORRENT_DEBUG
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// for torrent_info::invariant_check
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friend class torrent_info;
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#endif
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internal_file_entry()
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: offset(0)
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, symlink_index(not_a_symlink)
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, no_root_dir(false)
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, size(0)
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, name_len(name_is_owned)
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, pad_file(false)
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, hidden_attribute(false)
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, executable_attribute(false)
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, symlink_attribute(false)
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, name(NULL)
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, path_index(-1)
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{}
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internal_file_entry(file_entry const& e)
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: offset(e.offset)
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, symlink_index(not_a_symlink)
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, no_root_dir(false)
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, size(e.size)
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, name_len(name_is_owned)
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, pad_file(e.pad_file)
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, hidden_attribute(e.hidden_attribute)
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, executable_attribute(e.executable_attribute)
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, symlink_attribute(e.symlink_attribute)
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, name(NULL)
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, path_index(-1)
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{
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set_name(e.path.c_str());
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}
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internal_file_entry(internal_file_entry const& fe);
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internal_file_entry& operator=(internal_file_entry const& fe);
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~internal_file_entry();
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void set_name(char const* n, bool borrow_string = false, int string_len = 0);
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std::string filename() const;
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enum {
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name_is_owned = (1<<12)-1,
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not_a_symlink = (1<<15)-1
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};
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// the offset of this file inside the torrent
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boost::uint64_t offset:48;
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// index into file_storage::m_symlinks or not_a_symlink
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// if this is not a symlink
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boost::uint64_t symlink_index:15;
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// if this is true, don't include m_name as part of the
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// path to this file
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boost::uint64_t no_root_dir:1;
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// the size of this file
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boost::uint64_t size:48;
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// the number of characters in the name. If this is
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// name_is_owned, name is null terminated and owned by this object
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// (i.e. it should be freed in the destructor). If
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// the len is not name_is_owned, the name pointer doesn not belong
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// to this object, and it's not null terminated
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boost::uint64_t name_len:12;
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boost::uint64_t pad_file:1;
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boost::uint64_t hidden_attribute:1;
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boost::uint64_t executable_attribute:1;
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boost::uint64_t symlink_attribute:1;
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// make it available for logging
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private:
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// This string is not necessarily null terminated!
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// that's why it's private, to keep people away from it
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char const* name;
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public:
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// the index into file_storage::m_paths. To get
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// the full path to this file, concatenate the path
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// from that array with the 'name' field in
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// this struct
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// values for path_index include:
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// -1 means no path (i.e. single file torrent)
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// -2, it means the filename
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// in this field contains the full, absolute path
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// to the file
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int path_index;
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};
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// represents a window of a file in a torrent.
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//
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// The ``file_index`` refers to the index of the file (in the torrent_info).
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// To get the path and filename, use ``file_at()`` and give the ``file_index``
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// as argument. The ``offset`` is the byte offset in the file where the range
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// starts, and ``size`` is the number of bytes this range is. The size + offset
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// will never be greater than the file size.
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struct TORRENT_EXPORT file_slice
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{
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// the index of the file
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int file_index;
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// the offset from the start of the file, in bytes
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size_type offset;
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// the size of the window, in bytes
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size_type size;
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};
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// The ``file_storage`` class represents a file list and the piece
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// size. Everything necessary to interpret a regular bittorrent storage
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// file structure.
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class TORRENT_EXPORT file_storage
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{
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friend class torrent_info;
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public:
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// hidden
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file_storage();
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// hidden
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~file_storage() {}
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// returns true if the piece length has been initialized
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// on the file_storage. This is typically taken as a proxy
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// of whether the file_storage as a whole is initialized or
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// not.
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bool is_valid() const { return m_piece_length > 0; }
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// file attribute flags
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enum flags_t
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{
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// the file is a pad file. It's required to contain zeroes
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// at it will not be saved to disk. Its purpose is to make
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// the following file start on a piece boundary.
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pad_file = 1,
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// this file has the hidden attribute set. This is primarily
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// a windows attribute
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attribute_hidden = 2,
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// this file has the executable attribute set.
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attribute_executable = 4,
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// this file is a symbilic link. It should have a link
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// target string associated with it.
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attribute_symlink = 8
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};
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// allocates space for ``num_files`` in the internal file list. This can
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// be used to avoid reallocating the internal file list when the number
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// of files to be added is known up-front.
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void reserve(int num_files);
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// Adds a file to the file storage. The ``flags`` argument sets attributes on the file.
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// The file attributes is an extension and may not work in all bittorrent clients.
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//
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// For possible file attributes, see file_storage::flags_t.
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//
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// If more files than one are added, certain restrictions to their paths apply.
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// In a multi-file file storage (torrent), all files must share the same root directory.
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//
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// That is, the first path element of all files must be the same.
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// This shared path element is also set to the name of the torrent. It
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// can be changed by calling ``set_name``.
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//
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// The built in functions to traverse a directory to add files will
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// make sure this requirement is fulfilled.
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void add_file(file_entry const& e, char const* filehash = 0);
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void add_file(std::string const& p, size_type size, int flags = 0
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, std::time_t mtime = 0, std::string const& s_p = "");
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// renames the file at ``index`` to ``new_filename``. Keep in mind
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// that filenames are expected to be UTF-8 encoded.
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void rename_file(int index, std::string const& new_filename);
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// this is a low-level function that sets the name of a file
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// by making it reference a buffer that is not owned by the file_storage.
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// it's an optimization used when loading .torrent files, to not
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// duplicate names in memory.
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void rename_file_borrow(int index, char const* new_filename, int len);
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#if TORRENT_USE_WSTRING
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// all wstring APIs are deprecated since 0.16.11
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// instead, use the wchar -> utf8 conversion functions
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// and pass in utf8 strings
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#ifndef TORRENT_NO_DEPRECATE
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TORRENT_DEPRECATED_PREFIX
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void add_file(std::wstring const& p, size_type size, int flags = 0
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, std::time_t mtime = 0, std::string const& s_p = "") TORRENT_DEPRECATED;
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TORRENT_DEPRECATED_PREFIX
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void rename_file(int index, std::wstring const& new_filename) TORRENT_DEPRECATED;
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TORRENT_DEPRECATED_PREFIX
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void set_name(std::wstring const& n) TORRENT_DEPRECATED;
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void rename_file_deprecated(int index, std::wstring const& new_filename);
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#endif // TORRENT_NO_DEPRECATE
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#endif // TORRENT_USE_WSTRING
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// returns a list of file_slice objects representing the portions of
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// files the specified piece index, byte offset and size range overlaps.
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// this is the inverse mapping of map_file().
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std::vector<file_slice> map_block(int piece, size_type offset
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, int size) const;
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// returns a peer_request representing the piece index, byte offset
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// and size the specified file range overlaps. This is the inverse
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// mapping ove map_block().
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peer_request map_file(int file, size_type offset, int size) const;
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#ifndef TORRENT_NO_DEPRECATE
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// all functions depending on internal_file_entry
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// were deprecated in 1.0. Use the variants that take an
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// index instead
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typedef std::vector<internal_file_entry>::const_iterator iterator;
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typedef std::vector<internal_file_entry>::const_reverse_iterator reverse_iterator;
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TORRENT_DEPRECATED_PREFIX
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iterator file_at_offset(size_type offset) const TORRENT_DEPRECATED;
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TORRENT_DEPRECATED_PREFIX
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iterator begin() const TORRENT_DEPRECATED { return m_files.begin(); }
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TORRENT_DEPRECATED_PREFIX
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iterator end() const TORRENT_DEPRECATED { return m_files.end(); }
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TORRENT_DEPRECATED_PREFIX
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reverse_iterator rbegin() const TORRENT_DEPRECATED { return m_files.rbegin(); }
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TORRENT_DEPRECATED_PREFIX
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reverse_iterator rend() const TORRENT_DEPRECATED { return m_files.rend(); }
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TORRENT_DEPRECATED_PREFIX
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internal_file_entry const& internal_at(int index) const TORRENT_DEPRECATED
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{
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TORRENT_ASSERT(index >= 0);
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TORRENT_ASSERT(index < int(m_files.size()));
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return m_files[index];
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}
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TORRENT_DEPRECATED_PREFIX
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file_entry at(iterator i) const TORRENT_DEPRECATED;
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iterator begin_deprecated() const { return m_files.begin(); }
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iterator end_deprecated() const { return m_files.end(); }
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reverse_iterator rbegin_deprecated() const { return m_files.rbegin(); }
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reverse_iterator rend_deprecated() const { return m_files.rend(); }
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iterator file_at_offset_deprecated(size_type offset) const;
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#endif // TORRENT_NO_DEPRECATE
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// returns the number of files in the file_storage
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int num_files() const
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{ return int(m_files.size()); }
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// returns a file_entry with information about the file
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// at ``index``. Index must be in the range [0, ``num_files()`` ).
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file_entry at(int index) const;
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// returns the total number of bytes all the files in this torrent spans
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size_type total_size() const { return m_total_size; }
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// set and get the number of pieces in the torrent
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void set_num_pieces(int n) { m_num_pieces = n; }
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int num_pieces() const { TORRENT_ASSERT(m_piece_length > 0); return m_num_pieces; }
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// set and get the size of each piece in this torrent. This size is typically an even power
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// of 2. It doesn't have to be though. It should be divisible by 16kiB however.
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void set_piece_length(int l) { m_piece_length = l; }
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int piece_length() const { TORRENT_ASSERT(m_piece_length > 0); return m_piece_length; }
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// returns the piece size of ``index``. This will be the same as piece_length(), except
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// for the last piece, which may be shorter.
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int piece_size(int index) const;
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// set and get the name of this torrent. For multi-file torrents, this is also
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// the name of the root directory all the files are stored in.
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void set_name(std::string const& n) { m_name = n; }
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const std::string& name() const { return m_name; }
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// swap all content of *this* with *ti*.
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void swap(file_storage& ti)
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{
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using std::swap;
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swap(ti.m_files, m_files);
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swap(ti.m_num_files, m_num_files);
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swap(ti.m_file_hashes, m_file_hashes);
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swap(ti.m_symlinks, m_symlinks);
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swap(ti.m_mtime, m_mtime);
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swap(ti.m_file_base, m_file_base);
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swap(ti.m_paths, m_paths);
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swap(ti.m_name, m_name);
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swap(ti.m_total_size, m_total_size);
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swap(ti.m_num_pieces, m_num_pieces);
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swap(ti.m_piece_length, m_piece_length);
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}
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// deallocates most of the memory used by this
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// instance, leaving it only partially usable
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void unload();
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// returns true when populated with at least one file
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bool is_loaded() const { return !m_files.empty(); }
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// if pad_file_limit >= 0, files larger than that limit will be padded,
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// default is to not add any padding (-1). The alignment specifies the
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// alignment files should be padded to. This defaults to the piece size
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// (-1) but it may also make sense to set it to 16 kiB, or something
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// divisible by 16 kiB.
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// If pad_file_limit is 0, every file will be padded (except empty ones).
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void optimize(int pad_file_limit = -1, int alignment = -1);
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// These functions are used to query attributes of files at
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// a given index.
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//
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// The ``file_hash()`` is a sha-1 hash of the file, or 0 if none was
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// provided in the torrent file. This can potentially be used to
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// join a bittorrent network with other file sharing networks.
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//
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// The ``mtime()`` is the modification time is the posix
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// time when a file was last modified when the torrent
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// was created, or 0 if it was not included in the torrent file.
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//
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// ``file_path()`` returns the full path to a file.
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//
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// ``file_size()`` returns the size of a file.
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//
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// ``pad_file_at()`` returns true if the file at the given
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// index is a pad-file.
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//
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// ``file_name()`` returns *just* the name of the file, whereas
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// ``file_path()`` returns the path (inside the torrent file) with
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// the filename appended.
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//
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// ``file_offset()`` returns the byte offset within the torrent file
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// where this file starts. It can be used to map the file to a piece
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// index (given the piece size).
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sha1_hash hash(int index) const;
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std::string const& symlink(int index) const;
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time_t mtime(int index) const;
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std::string file_path(int index, std::string const& save_path = "") const;
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std::string file_name(int index) const;
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size_type file_size(int index) const;
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bool pad_file_at(int index) const;
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size_type file_offset(int index) const;
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// flags indicating various attributes for files in
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// a file_storage.
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enum file_flags_t
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{
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// this file is a pad file. The creator of the
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// torrent promises the file is entirely filled with
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// zeroes and does not need to be downloaded. The
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// purpose is just to align the next file to either
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// a block or piece boundary.
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flag_pad_file = 1,
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// this file is hiddent (sets the hidden attribute
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// on windows)
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flag_hidden = 2,
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// this file is executable (sets the executable bit
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// on posix like systems)
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flag_executable = 4,
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// this file is a symlink. The symlink target is
|
|
// specified in a separate field
|
|
flag_symlink = 8
|
|
};
|
|
|
|
std::vector<std::string> const& paths() const { return m_paths; }
|
|
|
|
// returns a bitmask of flags from file_flags_t that apply
|
|
// to file at ``index``.
|
|
int file_flags(int index) const;
|
|
|
|
// The file base of a file is the offset within the file on the filsystem
|
|
// where it starts to write. For the most part, this is always 0. It's
|
|
// possible to map several files (in the torrent) into a single file on
|
|
// the filesystem by making them all point to the same filename, but with
|
|
// different file bases, so that they don't overlap.
|
|
// torrent_info::remap_files() can be used to use a new file layout.
|
|
size_type file_base(int index) const;
|
|
void set_file_base(int index, size_type off);
|
|
|
|
// returns the index of the file at the given offset in the torrent
|
|
int file_index_at_offset(size_type offset) const;
|
|
|
|
// low-level function. returns a pointer to the internal storage for
|
|
// the filename. This string may not be null terinated!
|
|
// the ``file_name_len()`` function returns the length of the filename.
|
|
char const* file_name_ptr(int index) const;
|
|
int file_name_len(int index) const;
|
|
|
|
#ifndef TORRENT_NO_DEPRECATE
|
|
// these were deprecated in 1.0. Use the versions that take an index instead
|
|
TORRENT_DEPRECATED_PREFIX
|
|
sha1_hash hash(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
std::string const& symlink(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
time_t mtime(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
int file_index(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
size_type file_base(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
void set_file_base(internal_file_entry const& fe, size_type off) TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
std::string file_path(internal_file_entry const& fe, std::string const& save_path = "") const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
std::string file_name(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
size_type file_size(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
bool pad_file_at(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
TORRENT_DEPRECATED_PREFIX
|
|
size_type file_offset(internal_file_entry const& fe) const TORRENT_DEPRECATED;
|
|
#endif
|
|
|
|
private:
|
|
|
|
// the number of bytes in a regular piece
|
|
// (i.e. not the potentially truncated last piece)
|
|
int m_piece_length;
|
|
|
|
// the number of pieces in the torrent
|
|
int m_num_pieces;
|
|
|
|
void update_path_index(internal_file_entry& e);
|
|
void reorder_file(int index, int dst);
|
|
|
|
// the list of files that this torrent consists of
|
|
std::vector<internal_file_entry> m_files;
|
|
|
|
// if there are sha1 hashes for each individual file
|
|
// there are as many entries in this array as the
|
|
// m_files array. Each entry in m_files has a corresponding
|
|
// hash pointer in this array. The reason to split it up
|
|
// in separate arrays is to save memory in case the torrent
|
|
// doesn't have file hashes
|
|
std::vector<char const*> m_file_hashes;
|
|
|
|
// for files that are symlinks, the symlink
|
|
// path_index in the internal_file_entry indexes
|
|
// this vector of strings
|
|
std::vector<std::string> m_symlinks;
|
|
|
|
// the modification times of each file. This vector
|
|
// is empty if no file have a modification time.
|
|
// each element corresponds to the file with the same
|
|
// index in m_files
|
|
std::vector<time_t> m_mtime;
|
|
|
|
// if any file has a non-zero file base (i.e. multiple
|
|
// files residing in the same physical file at different
|
|
// offsets)
|
|
std::vector<size_type> m_file_base;
|
|
|
|
// all unique paths files have. The internal_file_entry::path_index
|
|
// points into this array. The paths don't include the root directory
|
|
// name for multi-file torrents. The m_name field need to be
|
|
// prepended to these paths, and the filename of a specific file
|
|
// entry appended, to form full file paths
|
|
std::vector<std::string> m_paths;
|
|
|
|
// name of torrent. For multi-file torrents
|
|
// this is always the root directory
|
|
std::string m_name;
|
|
|
|
// the sum of all filesizes
|
|
size_type m_total_size;
|
|
|
|
// the number of files. This is used when
|
|
// the torrent is unloaded
|
|
int m_num_files;
|
|
|
|
};
|
|
}
|
|
|
|
#endif // TORRENT_FILE_STORAGE_HPP_INCLUDED
|
|
|