301 lines
9.2 KiB
C++
301 lines
9.2 KiB
C++
/*
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Copyright (c) 2003-2008, 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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struct TORRENT_EXPORT file_entry
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{
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file_entry(): offset(0), size(0), file_base(0)
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, mtime(0), pad_file(false), hidden_attribute(false)
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, executable_attribute(false)
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, symlink_attribute(false)
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{}
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std::string path;
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size_type offset; // the offset of this file inside the torrent
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size_type size; // the size of this file
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// the offset in the file where the storage starts.
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// This is always 0 unless parts of the torrent is
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// compressed into a single file, such as a so-called part file.
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size_type file_base;
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std::time_t mtime;
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sha1_hash filehash;
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bool pad_file:1;
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bool hidden_attribute:1;
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bool executable_attribute:1;
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bool symlink_attribute:1;
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std::string symlink_path;
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};
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// this is used internally to hold the file entry
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// it's smaller and optimized for smaller memory
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// footprint, as opposed to file_entry, which is
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// optimized for convenience
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struct TORRENT_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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: name(0)
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, offset(0)
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, symlink_index(-1)
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, size(0)
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, name_len(0)
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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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, path_index(-1)
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{}
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internal_file_entry(file_entry const& e)
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: name(0)
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, offset(e.offset)
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, symlink_index(-1)
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, size(e.size)
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, name_len(0)
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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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, 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, int borrow_chars = 0);
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std::string filename() const;
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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 offset of this file inside the torrent
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size_type offset:48;
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// index into file_storage::m_symlinks or -1
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// if this is not a symlink
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size_type symlink_index:16;
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// the size of this file
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size_type size:48;
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// the number of characters in the name. If this is
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// 0, 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 > 0, the name pointer doesn not belong
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// to this object, and it's not null terminated
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size_type name_len:10;
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bool pad_file:1;
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bool hidden_attribute:1;
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bool executable_attribute:1;
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bool symlink_attribute:1;
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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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int path_index;
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};
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struct TORRENT_EXPORT file_slice
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{
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int file_index;
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size_type offset;
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size_type size;
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};
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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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file_storage();
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~file_storage() {}
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bool is_valid() const { return m_piece_length > 0; }
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enum flags_t
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{
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pad_file = 1,
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attribute_hidden = 2,
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attribute_executable = 4,
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attribute_symlink = 8
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};
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void reserve(int num_files);
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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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void rename_file(int index, std::string const& new_filename);
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#if TORRENT_USE_WSTRING
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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 = "");
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void rename_file(int index, std::wstring const& new_filename);
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void set_name(std::wstring const& n);
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#endif
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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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peer_request map_file(int file, size_type offset, int size) const;
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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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iterator file_at_offset(size_type offset) const;
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iterator begin() const { return m_files.begin(); }
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iterator end() const { return m_files.end(); }
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reverse_iterator rbegin() const { return m_files.rbegin(); }
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reverse_iterator rend() const { return m_files.rend(); }
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int num_files() const
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{ return int(m_files.size()); }
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file_entry at(int index) const;
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file_entry at(iterator i) const;
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size_type total_size() const { return m_total_size; }
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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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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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int piece_size(int index) const;
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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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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_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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// if pad_file_limit >= 0, files larger than
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// that limit will be padded, default is to
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// not add any padding
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void optimize(int pad_file_limit = -1);
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sha1_hash hash(internal_file_entry const& fe) const;
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std::string const& symlink(internal_file_entry const& fe) const;
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time_t mtime(internal_file_entry const& fe) const;
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int file_index(internal_file_entry const& fe) const;
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size_type file_base(internal_file_entry const& fe) const;
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void set_file_base(internal_file_entry const& fe, size_type off);
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std::string file_path(internal_file_entry const& fe) const;
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private:
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void update_path_index(internal_file_entry& e);
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void reorder_file(int index, int dst);
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// the list of files that this torrent consists of
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std::vector<internal_file_entry> m_files;
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// if there are sha1 hashes for each individual file
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// there are as many entries in this array as the
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// m_files array. Each entry in m_files has a corresponding
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// hash pointer in this array. The reason to split it up
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// in separate arrays is to save memory in case the torrent
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// doesn't have file hashes
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std::vector<char const*> m_file_hashes;
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// for files that are symlinks, the symlink
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// path_index in the internal_file_entry indexes
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// this vector of strings
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std::vector<std::string> m_symlinks;
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// the modification times of each file. This vector
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// is empty if no file have a modification time.
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// each element corresponds to the file with the same
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// index in m_files
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std::vector<time_t> m_mtime;
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// if any file has a non-zero file base (i.e. multiple
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// files residing in the same physical file at different
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// offsets)
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std::vector<size_type> m_file_base;
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// all unique paths files have. The internal_file_entry::path_index
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// points into this array
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std::vector<std::string> m_paths;
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// name of torrent. For multi-file torrents
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// this is always the root directory
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std::string m_name;
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// the sum of all filesizes
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size_type m_total_size;
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// the number of pieces in the torrent
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int m_num_pieces;
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int m_piece_length;
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};
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}
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#endif // TORRENT_FILE_STORAGE_HPP_INCLUDED
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