414 lines
12 KiB
C++
414 lines
12 KiB
C++
/*
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Copyright (c) 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_CREATE_TORRENT_HPP_INCLUDED
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#define TORRENT_CREATE_TORRENT_HPP_INCLUDED
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#include "libtorrent/bencode.hpp"
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#include "libtorrent/peer_id.hpp"
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#include "libtorrent/file_storage.hpp"
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#include "libtorrent/file_pool.hpp"
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#include "libtorrent/config.hpp"
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#include "libtorrent/storage.hpp"
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#include "libtorrent/hasher.hpp"
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#include "libtorrent/utf8.hpp"
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#include "libtorrent/allocator.hpp"
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#include "libtorrent/file.hpp" // for combine_path etc.
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#include <vector>
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#include <string>
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#include <utility>
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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/scoped_ptr.hpp>
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#include <boost/config.hpp>
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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namespace libtorrent
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{
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class torrent_info;
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struct TORRENT_EXPORT create_torrent
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{
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enum {
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optimize = 1
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, merkle = 2
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, modification_time = 4
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, symlinks = 8
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, calculate_file_hashes = 16
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};
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create_torrent(file_storage& fs, int piece_size = 0
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, int pad_file_limit = -1, int flags = optimize);
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create_torrent(torrent_info const& ti);
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entry generate() const;
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file_storage const& files() const { return m_files; }
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void set_comment(char const* str);
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void set_creator(char const* str);
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void set_hash(int index, sha1_hash const& h);
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void set_file_hash(int index, sha1_hash const& h);
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void add_url_seed(std::string const& url);
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void add_http_seed(std::string const& url);
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void add_node(std::pair<std::string, int> const& node);
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void add_tracker(std::string const& url, int tier = 0);
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void set_priv(bool p) { m_private = p; }
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int num_pieces() const { return m_files.num_pieces(); }
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int piece_length() const { return m_files.piece_length(); }
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int piece_size(int i) const { return m_files.piece_size(i); }
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bool priv() const { return m_private; }
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bool should_add_file_hashes() const { return m_calculate_file_hashes; }
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private:
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file_storage& m_files;
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// if m_info_dict is initialized, it is
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// used instead of m_files to generate
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// the info dictionary
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entry m_info_dict;
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// the urls to the trackers
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typedef std::pair<std::string, int> announce_entry;
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std::vector<announce_entry> m_urls;
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std::vector<std::string> m_url_seeds;
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std::vector<std::string> m_http_seeds;
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std::vector<sha1_hash> m_piece_hash;
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std::vector<sha1_hash> m_filehashes;
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// dht nodes to add to the routing table/bootstrap from
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typedef std::vector<std::pair<std::string, int> > nodes_t;
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nodes_t m_nodes;
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// the hash that identifies this torrent
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// is mutable because it's calculated
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// lazily
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mutable sha1_hash m_info_hash;
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// if a creation date is found in the torrent file
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// this will be set to that, otherwise it'll be
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// 1970, Jan 1
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time_t m_creation_date;
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// if a comment is found in the torrent file
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// this will be set to that comment
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std::string m_comment;
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// an optional string naming the software used
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// to create the torrent file
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std::string m_created_by;
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// this is used when creating a torrent. If there's
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// only one file there are cases where it's impossible
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// to know if it should be written as a multifile torrent
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// or not. e.g. test/test there's one file and one directory
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// and they have the same name.
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bool m_multifile:1;
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// this is true if the torrent is private. i.e., is should not
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// be announced on the dht
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bool m_private:1;
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// if set to one, a merkle torrent will be generated
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bool m_merkle_torrent:1;
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// if set, include the 'mtime' modification time in the
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// torrent file
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bool m_include_mtime:1;
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// if set, symbolic links are declared as such in
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// the torrent file. The full data of the pointed-to
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// file is still included
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bool m_include_symlinks:1;
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// this is only used by set_piece_hashes(). It will
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// calculate sha1 hashes for each file and add it
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// to the file list
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bool m_calculate_file_hashes:1;
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};
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namespace detail
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{
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inline bool default_pred(std::string const&) { return true; }
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inline bool ignore_subdir(std::string const& leaf)
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{ return leaf == ".." || leaf == "."; }
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inline void nop(int i) {}
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int TORRENT_EXPORT get_file_attributes(std::string const& p);
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std::string TORRENT_EXPORT get_symlink_path(std::string const& p);
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template <class Pred>
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void add_files_impl(file_storage& fs, std::string const& p
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, std::string const& l, Pred pred, boost::uint32_t flags)
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{
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std::string f = combine_path(p, l);
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if (!pred(f)) return;
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error_code ec;
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file_status s;
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stat_file(f, &s, ec, (flags & create_torrent::symlinks) ? dont_follow_links : 0);
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if (ec) return;
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// recurse into directories
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bool recurse = (s.mode & file_status::directory) != 0;
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// if the file is not a link or we're following links, and it's a directory
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// only then should we recurse
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#ifndef TORRENT_WINDOWS
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if ((s.mode & file_status::link) && (flags & create_torrent::symlinks))
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recurse = false;
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#endif
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if (recurse)
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{
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for (directory i(f, ec); !i.done(); i.next(ec))
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{
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std::string leaf = i.file();
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if (ignore_subdir(leaf)) continue;
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add_files_impl(fs, p, combine_path(l, leaf), pred, flags);
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}
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}
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else
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{
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// #error use the fields from s
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int file_flags = get_file_attributes(f);
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// mask all bits to check if the file is a symlink
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if ((file_flags & file_storage::attribute_symlink)
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&& (flags & create_torrent::symlinks))
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{
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std::string sym_path = get_symlink_path(f);
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fs.add_file(l, 0, file_flags, s.mtime, sym_path);
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}
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else
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{
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fs.add_file(l, s.file_size, file_flags, s.mtime);
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}
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}
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}
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}
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template <class Pred>
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void add_files(file_storage& fs, std::string const& file, Pred p, boost::uint32_t flags = 0)
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{
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detail::add_files_impl(fs, parent_path(complete(file)), filename(file), p, flags);
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}
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inline void add_files(file_storage& fs, std::string const& file, boost::uint32_t flags = 0)
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{
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detail::add_files_impl(fs, parent_path(complete(file)), filename(file)
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, detail::default_pred, flags);
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}
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struct piece_holder
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{
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piece_holder(int bytes): m_piece(page_aligned_allocator::malloc(bytes)) {}
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~piece_holder() { page_aligned_allocator::free(m_piece); }
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char* bytes() { return m_piece; }
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private:
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char* m_piece;
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};
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template <class Fun>
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void set_piece_hashes(create_torrent& t, std::string const& p, Fun f
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, error_code& ec)
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{
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file_pool fp;
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boost::scoped_ptr<storage_interface> st(
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default_storage_constructor(const_cast<file_storage&>(t.files()), 0, p, fp
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, std::vector<boost::uint8_t>()));
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// if we're calculating file hashes as well, use this hasher
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hasher filehash;
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int file_idx = 0;
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size_type left_in_file = t.files().at(0).size;
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// calculate the hash for all pieces
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int num = t.num_pieces();
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piece_holder buf(t.piece_length());
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for (int i = 0; i < num; ++i)
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{
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// read hits the disk and will block. Progress should
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// be updated in between reads
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st->read(buf.bytes(), i, 0, t.piece_size(i));
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if (st->error())
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{
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ec = st->error();
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return;
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}
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if (t.should_add_file_hashes())
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{
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int left_in_piece = t.piece_size(i);
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int this_piece_size = left_in_piece;
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// the number of bytes from this file we just read
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while (left_in_piece > 0)
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{
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int to_hash_for_file = int((std::min)(size_type(left_in_piece), left_in_file));
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if (to_hash_for_file > 0)
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{
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int offset = this_piece_size - left_in_piece;
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filehash.update(buf.bytes() + offset, to_hash_for_file);
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}
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left_in_file -= to_hash_for_file;
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left_in_piece -= to_hash_for_file;
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if (left_in_file == 0)
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{
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if (!t.files().at(file_idx).pad_file)
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t.set_file_hash(file_idx, filehash.final());
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filehash.reset();
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file_idx++;
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if (file_idx >= t.files().num_files()) break;
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left_in_file = t.files().at(file_idx).size;
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}
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}
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}
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hasher h(buf.bytes(), t.piece_size(i));
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t.set_hash(i, h.final());
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f(i);
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}
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}
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#ifndef BOOST_NO_EXCEPTIONS
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template <class Fun>
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void set_piece_hashes(create_torrent& t, std::string const& p, Fun f)
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{
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error_code ec;
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set_piece_hashes(t, p, f, ec);
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if (ec) throw libtorrent_exception(ec);
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}
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inline void set_piece_hashes(create_torrent& t, std::string const& p)
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{
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error_code ec;
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set_piece_hashes(t, p, detail::nop, ec);
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if (ec) throw libtorrent_exception(ec);
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}
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#endif
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inline void set_piece_hashes(create_torrent& t, std::string const& p, error_code& ec)
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{
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set_piece_hashes(t, p, detail::nop, ec);
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}
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#if TORRENT_USE_WSTRING
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// wstring versions
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template <class Pred>
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void add_files(file_storage& fs, std::wstring const& wfile, Pred p, boost::uint32_t flags = 0)
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{
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std::string utf8;
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wchar_utf8(wfile, utf8);
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detail::add_files_impl(fs, parent_path(complete(utf8))
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, filename(utf8), p, flags);
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}
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inline void add_files(file_storage& fs, std::wstring const& wfile, boost::uint32_t flags = 0)
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{
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std::string utf8;
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wchar_utf8(wfile, utf8);
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detail::add_files_impl(fs, parent_path(complete(utf8))
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, filename(utf8), detail::default_pred, flags);
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}
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template <class Fun>
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void set_piece_hashes(create_torrent& t, std::wstring const& p, Fun f
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, error_code& ec)
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{
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file_pool fp;
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std::string utf8;
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wchar_utf8(p, utf8);
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boost::scoped_ptr<storage_interface> st(
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default_storage_constructor(const_cast<file_storage&>(t.files()), 0, utf8, fp
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, std::vector<boost::uint8_t>()));
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// calculate the hash for all pieces
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int num = t.num_pieces();
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std::vector<char> buf(t.piece_length());
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for (int i = 0; i < num; ++i)
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{
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// read hits the disk and will block. Progress should
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// be updated in between reads
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st->read(&buf[0], i, 0, t.piece_size(i));
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if (st->error())
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{
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ec = st->error();
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return;
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}
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hasher h(&buf[0], t.piece_size(i));
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t.set_hash(i, h.final());
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f(i);
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}
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}
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#ifndef BOOST_NO_EXCEPTIONS
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template <class Fun>
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void set_piece_hashes(create_torrent& t, std::wstring const& p, Fun f)
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{
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error_code ec;
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set_piece_hashes(t, p, f, ec);
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if (ec) throw libtorrent_exception(ec);
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}
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inline void set_piece_hashes(create_torrent& t, std::wstring const& p)
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{
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error_code ec;
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set_piece_hashes(t, p, detail::nop, ec);
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if (ec) throw libtorrent_exception(ec);
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}
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#endif
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inline void set_piece_hashes(create_torrent& t, std::wstring const& p, error_code& ec)
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{
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set_piece_hashes(t, p, detail::nop, ec);
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}
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#endif // TORRENT_USE_WPATH
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}
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#endif
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