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/* <!-- copyright */
/*
* aria2 - The high speed download utility
*
* Copyright (C) 2006 Tatsuhiro Tsujikawa
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* In addition, as a special exception, the copyright holders give
* permission to link the code of portions of this program with the
* OpenSSL library under certain conditions as described in each
* individual source file, and distribute linked combinations
* including the two.
* You must obey the GNU General Public License in all respects
* for all of the code used other than OpenSSL. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you
* do not wish to do so, delete this exception statement from your
* version. If you delete this exception statement from all source
* files in the program, then also delete it here.
*/
/* copyright --> */
#include "BtExtendedMessage.h"
#include <cassert>
#include <cstring>
#include "ExtensionMessage.h"
#include "ExtensionMessageFactory.h"
#include "bittorrent_helper.h"
#include "Peer.h"
#include "DlAbortEx.h"
#include "message.h"
#include "util.h"
#include "a2functional.h"
namespace aria2 {
const char BtExtendedMessage::NAME[] = "extended";
BtExtendedMessage::BtExtendedMessage(
std::unique_ptr<ExtensionMessage> extensionMessage)
: SimpleBtMessage(ID, NAME),
extensionMessage_(std::move(extensionMessage)),
msgLength_(0)
{
}
std::vector<unsigned char> BtExtendedMessage::createMessage()
{
/**
* len --- 2+extpayload.length, 4bytes
* id --- 20, 1byte
* extmsgid --- extmsgid, 1byte
* extpayload --- extpayload, nbytes
* total: 6+extpayload.length bytes
*/
std::string payload = extensionMessage_->getPayload();
msgLength_ = 6 + payload.size();
auto msg = std::vector<unsigned char>(msgLength_);
auto p = msg.data();
bittorrent::createPeerMessageString(p, msgLength_, 2 + payload.size(), ID);
p += 5;
*p++ = extensionMessage_->getExtensionMessageID();
std::copy(std::begin(payload), std::end(payload), p);
return msg;
}
bool BtExtendedMessage::sendPredicate() const
{
return getPeer()->isExtendedMessagingEnabled();
}
std::string BtExtendedMessage::toString() const
{
std::string s = NAME;
s += " ";
s += extensionMessage_->toString();
return s;
}
std::unique_ptr<BtExtendedMessage>
BtExtendedMessage::create(ExtensionMessageFactory* factory,
const std::shared_ptr<Peer>& peer,
const unsigned char* data, size_t dataLength)
{
bittorrent::assertPayloadLengthGreater(1, dataLength, NAME);
bittorrent::assertID(ID, data, NAME);
assert(factory);
return make_unique<BtExtendedMessage>(
factory->createMessage(data + 1, dataLength - 1));
}
void BtExtendedMessage::doReceivedAction()
{
if (extensionMessage_) {
extensionMessage_->doReceivedAction();
}
}
const std::unique_ptr<ExtensionMessage>&
BtExtendedMessage::getExtensionMessage() const
{
return extensionMessage_;
}
} // namespace aria2
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