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122 lines
2.8 KiB
122 lines
2.8 KiB
/*
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This file is part of cpp-ethereum.
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cpp-ethereum is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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cpp-ethereum is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with cpp-ethereum. If not, see <http://www.gnu.org/licenses/>.
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*/
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/** @file Common.cpp
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* @author Gav Wood <i@gavwood.com>
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* @date 2014
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*/
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#include "Common.h"
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#include <libdevcore/SHA3.h>
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#include "Message.h"
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#include "BloomFilter.h"
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using namespace std;
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using namespace dev;
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using namespace dev::p2p;
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using namespace dev::shh;
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AbridgedTopic dev::shh::abridge(Topic const& _p)
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{
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return AbridgedTopic(sha3(_p));
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}
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AbridgedTopics dev::shh::abridge(Topics const& _topics)
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{
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AbridgedTopics ret;
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ret.reserve(_topics.size());
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for (auto const& t: _topics)
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ret.push_back(abridge(t));
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return ret;
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}
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AbridgedTopics BuildTopic::toAbridgedTopics() const
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{
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AbridgedTopics ret;
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ret.reserve(m_parts.size());
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for (auto const& h: m_parts)
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ret.push_back(abridge(h));
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return ret;
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}
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BuildTopic& BuildTopic::shiftBytes(bytes const& _b)
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{
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m_parts.push_back(dev::sha3(_b));
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return *this;
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}
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h256 TopicFilter::sha3() const
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{
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RLPStream s;
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streamRLP(s);
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return dev::sha3(s.out());
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}
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bool TopicFilter::matches(Envelope const& _e) const
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{
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for (TopicMask const& t: m_topicMasks)
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{
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for (unsigned i = 0; i < t.size(); ++i)
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{
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for (auto et: _e.topic())
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if (((t[i].first ^ et) & t[i].second) == AbridgedTopic())
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goto NEXT_TOPICPART;
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// failed to match topicmask against any topics: move on to next mask
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goto NEXT_TOPICMASK;
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NEXT_TOPICPART:;
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}
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// all topicmasks matched.
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return true;
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NEXT_TOPICMASK:;
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}
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return false;
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}
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TopicFilter::TopicFilter(RLP const& _r)
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{
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for (RLP const& i: _r)
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{
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m_topicMasks.push_back(TopicMask());
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for (RLP const& j: i)
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m_topicMasks.back().push_back(j.toPair<FixedHash<4>, FixedHash<4>>());
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}
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}
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TopicBloomFilterHash TopicFilter::exportBloom() const
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{
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TopicBloomFilterHash ret;
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for (TopicMask const& t: m_topicMasks)
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for (auto const& i: t)
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ret |= TopicBloomFilter::bloom(i.first);
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return ret;
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}
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TopicMask BuildTopicMask::toTopicMask() const
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{
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TopicMask ret;
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ret.reserve(m_parts.size());
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for (auto const& h: m_parts)
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ret.push_back(make_pair(abridge(h), ~AbridgedTopic()));
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return ret;
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}
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/*
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web3.shh.watch({}).arrived(function(m) { env.note("New message:\n"+JSON.stringify(m)); })
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k = web3.shh.newIdentity()
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web3.shh.post({from: k, topic: web3.fromAscii("test"), payload: web3.fromAscii("Hello world!")})
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*/
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