You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 

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/*
This file is part of cpp-ethereum.
cpp-ethereum 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 3 of the License, or
(at your option) any later version.
cpp-ethereum 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 cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file Common.cpp
* @author Gav Wood <i@gavwood.com>
* @date 2014
*/
#include "Common.h"
#include <libdevcore/SHA3.h>
#include "Message.h"
#include "BloomFilter.h"
using namespace std;
using namespace dev;
using namespace dev::p2p;
using namespace dev::shh;
AbridgedTopic dev::shh::abridge(Topic const& _p)
{
return AbridgedTopic(sha3(_p));
}
AbridgedTopics dev::shh::abridge(Topics const& _topics)
{
AbridgedTopics ret;
ret.reserve(_topics.size());
for (auto const& t: _topics)
ret.push_back(abridge(t));
return ret;
}
AbridgedTopics BuildTopic::toAbridgedTopics() const
{
AbridgedTopics ret;
ret.reserve(m_parts.size());
for (auto const& h: m_parts)
ret.push_back(abridge(h));
return ret;
}
BuildTopic& BuildTopic::shiftBytes(bytes const& _b)
{
m_parts.push_back(dev::sha3(_b));
return *this;
}
h256 TopicFilter::sha3() const
{
RLPStream s;
streamRLP(s);
return dev::sha3(s.out());
}
bool TopicFilter::matches(Envelope const& _e) const
{
for (TopicMask const& t: m_topicMasks)
{
for (unsigned i = 0; i < t.size(); ++i)
{
for (auto et: _e.topic())
if (((t[i].first ^ et) & t[i].second) == AbridgedTopic())
goto NEXT_TOPICPART;
// failed to match topicmask against any topics: move on to next mask
goto NEXT_TOPICMASK;
NEXT_TOPICPART:;
}
// all topicmasks matched.
return true;
NEXT_TOPICMASK:;
}
return false;
}
TopicFilter::TopicFilter(RLP const& _r)
{
for (RLP const& i: _r)
{
m_topicMasks.push_back(TopicMask());
for (RLP const& j: i)
m_topicMasks.back().push_back(j.toPair<FixedHash<4>, FixedHash<4>>());
}
}
TopicBloomFilterHash TopicFilter::exportBloom() const
{
TopicBloomFilterHash ret;
for (TopicMask const& t: m_topicMasks)
for (auto const& i: t)
ret |= TopicBloomFilter::bloom(i.first);
return ret;
}
TopicMask BuildTopicMask::toTopicMask() const
{
TopicMask ret;
ret.reserve(m_parts.size());
for (auto const& h: m_parts)
ret.push_back(make_pair(abridge(h), ~AbridgedTopic()));
return ret;
}
/*
web3.shh.watch({}).arrived(function(m) { env.note("New message:\n"+JSON.stringify(m)); })
k = web3.shh.newIdentity()
web3.shh.post({from: k, topic: web3.fromAscii("test"), payload: web3.fromAscii("Hello world!")})
*/