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premiere-libtorrent/src/session.cpp

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/*
Copyright (c) 2003, Arvid Norberg, Magnus Jonsson
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in
the documentation and/or other materials provided with the distribution.
* Neither the name of the author nor the names of its
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include <ctime>
#include <iostream>
#include <fstream>
#include <iomanip>
#include <iterator>
#include <algorithm>
#include <set>
#include <cctype>
#include <algorithm>
#ifdef _MSC_VER
#pragma warning(push, 1)
#endif
#include <boost/lexical_cast.hpp>
#include <boost/filesystem/convenience.hpp>
#include <boost/filesystem/exception.hpp>
#include <boost/limits.hpp>
#include <boost/bind.hpp>
#ifdef _MSC_VER
#pragma warning(pop)
#endif
#include "libtorrent/peer_id.hpp"
#include "libtorrent/torrent_info.hpp"
#include "libtorrent/tracker_manager.hpp"
#include "libtorrent/bencode.hpp"
#include "libtorrent/hasher.hpp"
#include "libtorrent/entry.hpp"
#include "libtorrent/session.hpp"
#include "libtorrent/fingerprint.hpp"
#include "libtorrent/entry.hpp"
#include "libtorrent/alert_types.hpp"
#include "libtorrent/invariant_check.hpp"
#include "libtorrent/file.hpp"
#include "libtorrent/allocate_resources.hpp"
#if defined(_MSC_VER) && _MSC_VER < 1300
namespace std
{
using ::srand;
using ::isprint;
};
#endif
namespace
{
int saturated_add(int a, int b)
{
assert(a>=0);
assert(b>=0);
int sum=a+b;
if(sum<0)
sum=std::numeric_limits<int>::max();
assert(sum>=a && sum>=b);
return sum;
}
// adjusts the upload rates of every peer connection
// to make sure the sum of all send quotas equals
// the given upload_limit. An upload limit of
// std::numeric_limits<int>::max() means unlimited upload
// rate, but the rates of each peer has to be set anyway,
// since it depends on the download rate from the peer.
void control_upload_rates(
int upload_limit,
libtorrent::detail::session_impl::connection_map connections)
{
assert(upload_limit >= 0);
using namespace libtorrent;
std::vector<resource_request *> requests;
for (detail::session_impl::connection_map::iterator c = connections.begin();
c != connections.end(); ++c)
{
boost::shared_ptr<peer_connection> p = c->second;
p->upload_bandwidth.used =
p->has_data() ? (int)ceil(p->statistics().upload_rate())
: 0;
requests.push_back(&p->upload_bandwidth);
}
allocate_resources(upload_limit, requests);
for (detail::session_impl::connection_map::iterator c = connections.begin();
c != connections.end(); ++c)
{
boost::shared_ptr<peer_connection> p = c->second;
p->update_send_quota_left();
}
}
/*
void control_number_of_connections(
int connections_limit,
libtorrent::detail::session_impl::torrent_map hash_list)
{
assert(connections_limit >= 0);
using namespace libtorrent;
std::vector<resource_consumer> torrents;
for (detail::session_impl::torrent_map::iterator c = hash_list.begin();
c != hash_list.end(); ++c)
{
boost::shared_ptr<torrent> t = c->second;
int estimated_capacity=t->num_peers()+1;
int limit =t->get_policy().get_max_connections();
if(limit==-1)
limit=std::numeric_limits<int>::max();
torrents.push_back(resource_consumer(t,limit,estimated_capacity));
}
allocate_resources(connections_limit, torrents);
for (std::vector<resource_consumer>::iterator r=torrents.begin();
r!=torrents.end(); ++r)
{
// TODO: inform torrent of how many connections it's allowed.
// boost::any_cast<boost::shared_ptr<torrent> >
// (r->who())->set_send_quota(r->allowed_use());
}
}
*/
}
namespace libtorrent
{
namespace detail
{
void checker_impl::operator()()
{
eh_initializer();
for (;;)
{
piece_checker_data* t;
{
boost::mutex::scoped_lock l(m_mutex);
// if the job queue is empty and
// we shouldn't abort
// wait for a signal
if (m_torrents.empty() && !m_abort)
m_cond.wait(l);
if (m_abort) return;
assert(!m_torrents.empty());
t = &m_torrents.front();
if (t->abort)
{
m_torrents.pop_front();
continue;
}
}
try
{
assert(t != 0);
t->torrent_ptr->check_files(*t, m_mutex);
// lock the session to add the new torrent
boost::mutex::scoped_lock l(m_mutex);
if (!t->abort)
{
boost::mutex::scoped_lock l(m_ses.m_mutex);
m_ses.m_torrents.insert(
std::make_pair(t->info_hash, t->torrent_ptr)).first;
peer_id id;
std::fill(id.begin(), id.end(), 0);
for (std::vector<address>::const_iterator i = t->peers.begin();
i != t->peers.end();
++i)
{
t->torrent_ptr->get_policy().peer_from_tracker(*i, id);
}
}
}
catch(const std::exception& e)
{
// TODO: generate an alert here!
#ifndef NDEBUG
std::cerr << "error while checking files: " << e.what() << "\n";
#endif
}
catch(...)
{
#ifndef NDEBUG
std::cerr << "error while checking files\n";
#endif
}
// remove ourself from the 'checking'-list
// (we're no longer in the checking state)
boost::mutex::scoped_lock l(m_mutex);
m_torrents.pop_front();
}
}
detail::piece_checker_data* checker_impl::find_torrent(const sha1_hash& info_hash)
{
for (std::deque<piece_checker_data>::iterator i
= m_torrents.begin();
i != m_torrents.end();
++i)
{
if (i->info_hash == info_hash) return &(*i);
}
return 0;
}
session_impl::session_impl(std::pair<int, int> listen_port_range,
const fingerprint& cl_fprint)
: m_tracker_manager(m_settings)
, m_listen_port_range(listen_port_range)
, m_listen_port(listen_port_range.first)
, m_abort(false)
, m_upload_rate(-1)
, m_incoming_connection(false)
{
assert(listen_port_range.first > 0);
assert(listen_port_range.first < listen_port_range.second);
assert(m_listen_port > 0);
// ---- generate a peer id ----
std::srand((unsigned int)std::time(0));
std::string print = cl_fprint.to_string();
assert(print.length() == 8);
// the client's fingerprint
std::copy(
print.begin()
, print.begin() + print.length()
, m_peer_id.begin());
// the random number
for (unsigned char* i = m_peer_id.begin() + print.length();
i != m_peer_id.end();
++i)
{
*i = rand();
}
}
void session_impl::purge_connections()
{
while (!m_disconnect_peer.empty())
{
m_connections.erase(m_disconnect_peer.back());
m_disconnect_peer.pop_back();
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
}
}
void session_impl::operator()()
{
eh_initializer();
#ifndef NDEBUG
m_logger = create_log("main session");
try
{
#endif
// create listener socket
boost::shared_ptr<socket> listener(new socket(socket::tcp, false));
for(;;)
{
try
{
listener->listen(m_listen_port, 5);
}
catch (std::exception&)
{
m_listen_port++;
if (m_listen_port > m_listen_port_range.second)
{
m_alerts.post_alert(listen_failed_alert(
"none of the ports in the given range could be opened"));
return;
}
continue;
}
break;
}
#ifndef NDEBUG
(*m_logger) << "listening on port: " << m_listen_port << "\n";
#endif
m_selector.monitor_readability(listener);
m_selector.monitor_errors(listener);
std::vector<boost::shared_ptr<socket> > readable_clients;
std::vector<boost::shared_ptr<socket> > writable_clients;
std::vector<boost::shared_ptr<socket> > error_clients;
boost::posix_time::ptime timer = boost::posix_time::second_clock::local_time();
#ifndef NDEBUG
int loops_per_second = 0;
#endif
for(;;)
{
#ifndef NDEBUG
check_invariant("loops_per_second++");
loops_per_second++;
#endif
// if nothing happens within 500000 microseconds (0.5 seconds)
// do the loop anyway to check if anything else has changed
// << "sleeping\n";
m_selector.wait(500000, readable_clients, writable_clients, error_clients);
#ifndef NDEBUG
for (std::vector<boost::shared_ptr<libtorrent::socket> >::iterator i =
writable_clients.begin();
i != writable_clients.end();
++i)
{
assert((*i)->is_writable());
}
#endif
boost::mutex::scoped_lock l(m_mutex);
// +1 for the listen socket
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
if (m_abort)
{
m_tracker_manager.abort_all_requests();
for (std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i =
m_torrents.begin();
i != m_torrents.end();
++i)
{
i->second->abort();
m_tracker_manager.queue_request(i->second->generate_tracker_request(m_listen_port));
}
m_connections.clear();
m_torrents.clear();
break;
}
#ifndef NDEBUG
check_invariant("before SEND SOCKETS");
#endif
// ************************
// SEND SOCKETS
// ************************
// let the writable clients send data
for (std::vector<boost::shared_ptr<socket> >::iterator i
= writable_clients.begin();
i != writable_clients.end();
++i)
{
assert((*i)->is_writable());
connection_map::iterator p = m_connections.find(*i);
// the connection may have been disconnected in the receive phase
if (p == m_connections.end())
{
m_selector.remove(*i);
}
else
{
try
{
assert(m_selector.is_writability_monitored(p->first));
assert(p->second->has_data());
assert(p->second->get_socket()->is_writable());
p->second->send_data();
}
catch (file_error& e)
{
torrent* t = p->second->associated_torrent();
assert(t != 0);
if (m_alerts.should_post(alert::fatal))
{
m_alerts.post_alert(
file_error_alert(
t->get_handle()
, e.what()));
}
m_selector.remove(*i);
m_connections.erase(p);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
t->abort();
}
catch (std::exception& e)
{
// the connection wants to disconnect for some reason,
// remove it from the connection-list
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(p->first->sender(), e.what()));
}
m_selector.remove(*i);
m_connections.erase(p);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
}
}
}
purge_connections();
#ifndef NDEBUG
check_invariant("after SEND SOCKETS");
#endif
// ************************
// RECEIVE SOCKETS
// ************************
// let the readable clients receive data
for (std::vector<boost::shared_ptr<socket> >::iterator i = readable_clients.begin();
i != readable_clients.end();
++i)
{
// special case for listener socket
if (*i == listener)
{
boost::shared_ptr<libtorrent::socket> s = (*i)->accept();
if (s)
{
s->set_blocking(false);
// we got a connection request!
m_incoming_connection = true;
#ifndef NDEBUG
(*m_logger) << s->sender().as_string() << " <== INCOMING CONNECTION\n";
#endif
// TODO: filter ip:s
boost::shared_ptr<peer_connection> c(
new peer_connection(*this, m_selector, s));
if (m_upload_rate != -1) {
c->upload_bandwidth.given=0;
c->update_send_quota_left();
}
m_connections.insert(std::make_pair(s, c));
m_selector.monitor_readability(s);
m_selector.monitor_errors(s);
}
continue;
}
connection_map::iterator p = m_connections.find(*i);
if(p == m_connections.end())
{
m_selector.remove(*i);
}
else
{
try
{
// (*m_logger) << "readable: " << p->first->sender().as_string() << "\n";
p->second->receive_data();
}
catch (file_error& e)
{
torrent* t = p->second->associated_torrent();
assert(t != 0);
if (m_alerts.should_post(alert::fatal))
{
m_alerts.post_alert(
file_error_alert(
t->get_handle()
, e.what()));
}
m_selector.remove(*i);
m_connections.erase(p);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
t->abort();
}
catch (std::exception& e)
{
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(p->first->sender(), e.what()));
}
// the connection wants to disconnect for some reason, remove it
// from the connection-list
m_selector.remove(*i);
m_connections.erase(p);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
}
}
}
purge_connections();
#ifndef NDEBUG
check_invariant("after RECEIVE SOCKETS");
#endif
// ************************
// ERROR SOCKETS
// ************************
// disconnect the one we couldn't connect to
for (std::vector<boost::shared_ptr<socket> >::iterator i = error_clients.begin();
i != error_clients.end();
++i)
{
connection_map::iterator p = m_connections.find(*i);
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(
p->first->sender()
, "socket received an exception"));
}
m_selector.remove(*i);
// the connection may have been disconnected in the receive or send phase
if (p != m_connections.end())
{
m_connections.erase(p);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
}
}
#ifndef NDEBUG
check_invariant("after ERROR SOCKETS");
#endif
boost::posix_time::time_duration d = boost::posix_time::second_clock::local_time() - timer;
if (d.seconds() < 1) continue;
timer = boost::posix_time::second_clock::local_time();
// ************************
// THE SECTION BELOW IS EXECUTED ONCE EVERY SECOND
// ************************
#ifndef NDEBUG
// std::cout << "\n\nloops: " << loops_per_second << "\n";
loops_per_second = 0;
#endif
// do the second_tick() on each connection
// this will update their statistics (download and upload speeds)
// also purge sockets that have timed out
// and keep sockets open by keeping them alive.
for (connection_map::iterator i = m_connections.begin();
i != m_connections.end();)
{
connection_map::iterator j = i;
++i;
// if this socket has timed out
// close it.
if (j->second->has_timed_out())
{
if (m_alerts.should_post(alert::debug))
{
m_alerts.post_alert(
peer_error_alert(j->first->sender(), "connection timed out"));
}
m_selector.remove(j->first);
m_connections.erase(j);
assert(m_selector.count_read_monitors() == (int)m_connections.size() + 1);
continue;
}
j->second->keep_alive();
}
// check each torrent for abortion or
// tracker updates
for (std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i
= m_torrents.begin();
i != m_torrents.end();)
{
if (i->second->is_aborted())
{
m_tracker_manager.queue_request(
i->second->generate_tracker_request(m_listen_port));
i->second->disconnect_all();
#ifndef NDEBUG
sha1_hash i_hash = i->second->torrent_file().info_hash();
#endif
std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator j = i;
++i;
m_torrents.erase(j);
assert(m_torrents.find(i_hash) == m_torrents.end());
continue;
}
else if (i->second->should_request())
{
m_tracker_manager.queue_request(
i->second->generate_tracker_request(m_listen_port),
boost::get_pointer(i->second));
}
i->second->second_tick();
++i;
}
purge_connections();
// distribute the maximum upload rate among the peers
control_upload_rates(m_upload_rate == -1
? std::numeric_limits<int>::max()
: m_upload_rate
,m_connections);
m_tracker_manager.tick();
}
while (!m_tracker_manager.send_finished())
{
m_tracker_manager.tick();
boost::xtime t;
boost::xtime_get(&t, boost::TIME_UTC);
t.nsec += 100000000;
boost::thread::sleep(t);
}
#ifndef NDEBUG
}
catch (std::bad_cast& e)
{
std::cerr << e.what() << "\n";
}
catch (std::exception& e)
{
std::cerr << e.what() << "\n";
}
catch (...)
{
std::cerr << "error!\n";
}
#endif
}
// the return value from this function is valid only as long as the
// session is locked!
torrent* session_impl::find_torrent(const sha1_hash& info_hash)
{
std::map<sha1_hash, boost::shared_ptr<torrent> >::iterator i
= m_torrents.find(info_hash);
if (i != m_torrents.end()) return boost::get_pointer(i->second);
return 0;
}
#ifndef NDEBUG
boost::shared_ptr<logger> session_impl::create_log(std::string name)
{
name = "libtorrent_log_" + name + ".log";
// current options are file_logger and cout_logger
#if defined(TORRENT_VERBOSE_LOGGING)
return boost::shared_ptr<logger>(new file_logger(name.c_str()));
#else
return boost::shared_ptr<logger>(new null_logger());
#endif
}
#endif
#ifndef NDEBUG
void session_impl::check_invariant(const char *place)
{
assert(place);
for (connection_map::iterator i = m_connections.begin();
i != m_connections.end();
++i)
{
if (i->second->has_data() != m_selector.is_writability_monitored(i->first))
{
std::ofstream error_log("error.log", std::ios_base::app);
boost::shared_ptr<peer_connection> p = i->second;
error_log << "session_imple::check_invariant()\n"
"peer_connection::has_data() != is_writability_monitored()\n";
error_log << "peer_connection::has_data() " << p->has_data() << "\n";
error_log << "peer_connection::send_quota_left " << p->send_quota_left() << "\n";
error_log << "peer_connection::upload_bandwidth.given " << p->upload_bandwidth.given << "\n";
error_log << "peer_connection::get_peer_id " << p->get_peer_id() << "\n";
error_log << "place: " << place << "\n";
error_log.flush();
assert(false);
}
if (i->second->associated_torrent())
{
assert(i->second->associated_torrent()
->get_policy().has_connection(boost::get_pointer(i->second)));
}
}
}
#endif
}
session::session(std::pair<int, int> listen_port_range, const fingerprint& id)
: m_impl(listen_port_range, id)
, m_checker_impl(m_impl)
, m_thread(boost::ref(m_impl))
, m_checker_thread(boost::ref(m_checker_impl))
{
assert(listen_port_range.first > 0);
assert(listen_port_range.first < listen_port_range.second);
#ifndef NDEBUG
// this test was added after it came to my attention
// that devstudios managed c++ failed to generate
// correct code for boost.function
boost::function0<void> test = boost::ref(m_impl);
assert(!test.empty());
#endif
}
session::session(std::pair<int, int> listen_port_range)
: m_impl(listen_port_range, fingerprint("LT",0,0,1,0))
, m_checker_impl(m_impl)
, m_thread(boost::ref(m_impl))
, m_checker_thread(boost::ref(m_checker_impl))
{
assert(listen_port_range.first > 0);
assert(listen_port_range.first < listen_port_range.second);
#ifndef NDEBUG
boost::function0<void> test = boost::ref(m_impl);
assert(!test.empty());
#endif
}
// TODO: add a check to see if filenames are accepted on the
// current platform.
// if the torrent already exists, this will throw duplicate_torrent
torrent_handle session::add_torrent(
const torrent_info& ti
, const boost::filesystem::path& save_path
, const entry& resume_data)
{
{
// lock the session
boost::mutex::scoped_lock l(m_impl.m_mutex);
// is the torrent already active?
if (m_impl.find_torrent(ti.info_hash()))
throw duplicate_torrent();
}
{
// lock the checker_thread
boost::mutex::scoped_lock l(m_checker_impl.m_mutex);
// is the torrent currently being checked?
if (m_checker_impl.find_torrent(ti.info_hash()))
throw duplicate_torrent();
}
// create the torrent and the data associated with
// the checker thread and store it before starting
// the thread
boost::shared_ptr<torrent> torrent_ptr(
new torrent(m_impl, ti, save_path));
detail::piece_checker_data d;
d.torrent_ptr = torrent_ptr;
d.save_path = save_path;
d.info_hash = ti.info_hash();
d.parse_resume_data(resume_data, torrent_ptr->torrent_file());
// lock the checker thread
boost::mutex::scoped_lock l(m_checker_impl.m_mutex);
// add the torrent to the queue to be checked
m_checker_impl.m_torrents.push_back(d);
// and notify the thread that it got another
// job in its queue
m_checker_impl.m_cond.notify_one();
return torrent_handle(&m_impl, &m_checker_impl, ti.info_hash());
}
void session::remove_torrent(const torrent_handle& h)
{
if (h.m_ses != &m_impl) return;
assert(h.m_chk == &m_checker_impl);
{
boost::mutex::scoped_lock l(m_impl.m_mutex);
torrent* t = m_impl.find_torrent(h.m_info_hash);
if (t != 0)
{
t->abort();
return;
}
}
{
boost::mutex::scoped_lock l(m_checker_impl.m_mutex);
detail::piece_checker_data* d = m_checker_impl.find_torrent(h.m_info_hash);
if (d != 0)
{
d->abort = true;
return;
}
}
}
void session::set_http_settings(const http_settings& s)
{
boost::mutex::scoped_lock l(m_impl.m_mutex);
m_impl.m_settings = s;
}
session::~session()
{
{
boost::mutex::scoped_lock l(m_impl.m_mutex);
m_impl.m_abort = true;
}
{
boost::mutex::scoped_lock l(m_checker_impl.m_mutex);
// abort the checker thread
m_checker_impl.m_abort = true;
// abort the currently checking torrent
if (!m_checker_impl.m_torrents.empty())
{
m_checker_impl.m_torrents.front().abort = true;
}
m_checker_impl.m_cond.notify_one();
}
m_thread.join();
m_checker_thread.join();
}
void session::set_upload_rate_limit(int bytes_per_second)
{
assert(bytes_per_second > 0 || bytes_per_second == -1);
boost::mutex::scoped_lock l(m_impl.m_mutex);
m_impl.m_upload_rate = bytes_per_second;
if (m_impl.m_upload_rate != -1 || !m_impl.m_connections.empty())
return;
for (detail::session_impl::connection_map::iterator i
= m_impl.m_connections.begin();
i != m_impl.m_connections.end();)
{
i->second->upload_bandwidth.given=std::numeric_limits<int>::max();
i->second->update_send_quota_left();
}
}
std::auto_ptr<alert> session::pop_alert()
{
if (m_impl.m_alerts.pending())
return m_impl.m_alerts.get();
else
return std::auto_ptr<alert>(0);
}
void session::set_severity_level(alert::severity_t s)
{
m_impl.m_alerts.set_severity(s);
}
void detail::piece_checker_data::parse_resume_data(
const entry& resume_data
, const torrent_info& info)
{
// if we don't have any resume data, return
if (resume_data.type() == entry::undefined_t) return;
entry rd = resume_data;
try
{
if (rd.dict()["file-format"].string() != "libtorrent resume file")
return;
if (rd.dict()["file-version"].integer() != 1)
return;
// verify info_hash
const std::string &hash = rd.dict()["info-hash"].string();
std::string real_hash((char*)info.info_hash().begin(), (char*)info.info_hash().end());
if (hash != real_hash)
return;
// the peers
entry::list_type& peer_list = rd.dict()["peers"].list();
std::vector<address> tmp_peers;
tmp_peers.reserve(peer_list.size());
for (entry::list_type::iterator i = peer_list.begin();
i != peer_list.end();
++i)
{
address a(
i->dict()["ip"].string()
, (unsigned short)i->dict()["port"].integer());
tmp_peers.push_back(a);
}
peers.swap(tmp_peers);
// read piece map
const entry::list_type& slots = rd.dict()["slots"].list();
if ((int)slots.size() > info.num_pieces())
return;
std::vector<int> tmp_pieces;
tmp_pieces.reserve(slots.size());
for (entry::list_type::const_iterator i = slots.begin();
i != slots.end();
++i)
{
int index = (int)i->integer();
if (index >= info.num_pieces() || index < -2)
return;
tmp_pieces.push_back(index);
}
int num_blocks_per_piece = (int)rd.dict()["blocks per piece"].integer();
if (num_blocks_per_piece != info.piece_length() / torrent_ptr->block_size())
return;
// the unfinished pieces
entry::list_type& unfinished = rd.dict()["unfinished"].list();
std::vector<piece_picker::downloading_piece> tmp_unfinished;
tmp_unfinished.reserve(unfinished.size());
for (entry::list_type::iterator i = unfinished.begin();
i != unfinished.end();
++i)
{
piece_picker::downloading_piece p;
p.index = (int)i->dict()["piece"].integer();
if (p.index < 0 || p.index >= info.num_pieces())
return;
const std::string& bitmask = i->dict()["bitmask"].string();
const int num_bitmask_bytes = std::max(num_blocks_per_piece / 8, 1);
if ((int)bitmask.size() != num_bitmask_bytes) return;
for (int j = 0; j < num_bitmask_bytes; ++j)
{
unsigned char bits = bitmask[j];
for (int k = 0; k < 8; ++k)
{
const int bit = j * 8 + k;
if (bits & (1 << k))
p.finished_blocks[bit] = true;
}
}
if (p.finished_blocks.count() == 0) continue;
std::vector<int>::iterator slot_iter
= std::find(tmp_pieces.begin(), tmp_pieces.end(), p.index);
if (slot_iter == tmp_pieces.end())
{
// this piece is marked as unfinished
// but doesn't have any storage
return;
}
assert(*slot_iter == p.index);
int slot_index = static_cast<int>(slot_iter - tmp_pieces.begin());
unsigned long adler
= torrent_ptr->filesystem().piece_crc(
slot_index
, torrent_ptr->block_size()
, p.finished_blocks);
entry::dictionary_type::iterator ad = i->dict().find("adler32");
if (ad != i->dict().end())
{
// crc's didn't match, don't use the resume data
if (ad->second.integer() != adler)
return;
}
tmp_unfinished.push_back(p);
}
// verify file sizes
std::vector<size_type> file_sizes;
entry::list_type& l = rd.dict()["file sizes"].list();
#if defined(_MSC_VER) && _MSC_VER < 1300
for (entry::list_type::iterator i = l.begin();
i != l.end();
++i)
{
file_sizes.push_back(i->integer());
}
#else
// typedef entry::integer_type (entry::*mem_fun_type)() const;
std::transform(
l.begin()
, l.end()
, std::back_inserter(file_sizes)
, boost::bind(&entry::integer, _1));
#endif
if (!match_filesizes(info, save_path, file_sizes))
return;
piece_map.swap(tmp_pieces);
unfinished_pieces.swap(tmp_unfinished);
}
catch (invalid_encoding)
{
return;
}
catch (type_error)
{
return;
}
}
}
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