C++ Blob函數代碼示例

void MatrixServerTable<T>::ProcessGet(const std::vector<Blob>& data,
  std::vector<Blob>* result) {
  CHECK(data.size() == 1);
  CHECK_NOTNULL(result);

  result->push_back(data[0]); // also push the key

  size_t keys_size = data[0].size<integer_t>();
  integer_t* keys = reinterpret_cast<integer_t*>(data[0].data());

  //get all rows
  if (keys_size == 1 && keys[0] == -1){
    Blob value(sizeof(T) * storage_.size());
    T* pvalues = reinterpret_cast<T*>(value.data());
    updater_->Access(storage_.size(), storage_.data(), pvalues);
    result->push_back(value);
    result->push_back(Blob(&server_id_, sizeof(int)));
    Log::Debug("[ProcessGet] Server = %d, getting rows offset = %d, #rows = %d\n",
      server_id_, row_offset_, storage_.size() / num_col_);
    return;
  }

  integer_t row_size = sizeof(T)* num_col_;
  result->push_back(Blob(keys_size * row_size));
  T* vals = reinterpret_cast<T*>((*result)[1].data());
  integer_t offset_v = 0;
  for (auto i = 0; i < keys_size; ++i) {
    integer_t offset_s = (keys[i] - row_offset_) * num_col_;
    updater_->Access(num_col_, storage_.data(), vals + offset_v, offset_s);
    offset_v += num_col_;
    Log::Debug("[ProcessAdd] Server = %d, getting #row = %d\n",
      server_id_, keys[i]);
  }
}

bool BdbReader::Read(Blob& key, Blob& value) {
LAB_AGAIN:
	while (true) {
		if (m_idx < 0)
			return false;
		if (m_idx < m_entries)
			break;
		if (!LoadNextPage(m_pgno+1))
			return false;
	}
	int keyIdx = *((UInt16*)(m_curPage.data()+26)+m_idx*2),
		valIdx = *((UInt16*)(m_curPage.data()+26)+m_idx*2+1);
	if (keyIdx+3 > m_curPage.Size || valIdx+3 > m_curPage.Size) {
		m_idx = m_entries;
		goto LAB_AGAIN;
	}
	++m_idx;
	int keyLen = *(UInt16*)(m_curPage.data()+keyIdx),
		valLen = *(UInt16*)(m_curPage.data()+valIdx);
	if (keyIdx+keyLen > m_curPage.Size || valIdx+valLen > m_curPage.Size) {
		m_idx = m_entries;
		goto LAB_AGAIN;
	}
	if (*(m_curPage.data()+keyIdx+2) != 1 || *(m_curPage.data()+valIdx+2) != 1)
		goto LAB_AGAIN;
	key = Blob(m_curPage.data()+keyIdx+3, keyLen);
	value = Blob(m_curPage.data()+valIdx+3, valLen);
	return true;
}

Blob Object::toBlob() const
{
	if(isBlob())
		return Blob(*this);
	else
		return Blob();
}

void 
Sha256WithRsaSignature::set(const struct ndn_Signature& signatureStruct)
{
  digestAlgorithm_ = Blob(signatureStruct.digestAlgorithm);
  witness_ = Blob(signatureStruct.witness);
  signature_ = Blob(signatureStruct.signature);
  publisherPublicKeyDigest_.set(signatureStruct.publisherPublicKeyDigest);
  keyLocator_.set(signatureStruct.keyLocator);
}

Blob IPAddress::GetAddressBytes() const {
	int size = FamilySize(AddressFamily);
	if (!size)
		Throw(ExtErr::UnknownHostAddressType);
	switch ((int)get_AddressFamily()) {
	case AF_INET:
		return Blob(&m_sin.sin_addr, 4);
	case AF_INET6:
		return Blob(&m_sin6.sin6_addr, 16);
	default:
		Throw(ExtErr::UnknownHostAddressType);
	}
}

Blob Sec256Signature::Serialize() const {
	uint8_t buf[100];
	size_t size = sizeof buf;
	if (!secp256k1_ecdsa_sig_serialize(buf, &size, &m_r, &m_s))
		Throw(errc::invalid_argument);
	return Blob(buf, size);
}

Blob Sec256Dsa::PrivKeyToDER(RCSpan privKey, bool bCompressed) {
	ASSERT(privKey.size() == 32);
	uint8_t ar[279];
	size_t privkeylen = sizeof ar;
	Sec256Check(::ec_privkey_export_der(g_sec256Ctx, ar, &privkeylen, privKey.data(), bCompressed));
	return Blob(ar, privkeylen);
}

    /** We got some data for a ledger we are no longer acquiring
        Since we paid the price to receive it, we might as well stash it in case we need it.
        Nodes are received in wire format and must be stashed/hashed in prefix format
    */
    void gotStaleData (std::shared_ptr<protocol::TMLedgerData> packet_ptr)
    {
        const uint256 uZero;
        Serializer s;
        try
        {
            for (int i = 0; i < packet_ptr->nodes ().size (); ++i)
            {
                auto const& node = packet_ptr->nodes (i);

                if (!node.has_nodeid () || !node.has_nodedata ())
                    return;

                auto newNode = SHAMapAbstractNode::make(
                    Blob (node.nodedata().begin(), node.nodedata().end()),
                    0, snfWIRE, uZero, false);

                if (!newNode)
                    return;

                s.erase();
                newNode->addRaw(s, snfPREFIX);

                auto blob = std::make_shared<Blob> (s.begin(), s.end());

                getApp().getOPs().addFetchPack (newNode->getNodeHash(), blob);
            }
        }
        catch (...)
        {
        }
    }

Blob ConvertFromBase58(RCString s, bool bCheckHash) {
	BigInteger bi = 0;
	for (const char *p=s; *p; ++p) {
		if (const char *q = strchr(s_pszBase58, *p)) {
			bi = bi*58 + BigInteger(q-s_pszBase58);
		} else
			Throw(errc::invalid_argument);
	}
	vector<byte> v((bi.Length+7)/8);
	bi.ToBytes(&v[0], v.size());
	if (v.size()>=2 && v.end()[-1]==0 && v.end()[-1]>=0x80)
		v.resize(v.size()-1);
	vector<byte> r;
	for (const char *p=s; *p==s_pszBase58[0]; ++p)
		r.push_back(0);
	r.resize(r.size()+v.size());
	std::reverse_copy(v.begin(), v.end(), r.end()-v.size());
	if (r.size() < 4)
		Throw(E_FAIL);
	if (bCheckHash) {
		HashValue hash = HasherEng::GetCurrent()->HashForAddress(ConstBuf(&r[0], r.size()-4));
		if (memcmp(hash.data(), &r.end()[-4], 4))
			Throw(HRESULT_FROM_WIN32(ERROR_CRC));
	}
	return Blob(&r[0], r.size()-4);
}

Blob ConvertFromBase58ShaSquare(RCString s) {
	BigInteger bi = 0;
	for (const char *p=s; *p; ++p) {
		if (const char *q = strchr(s_pszBase58, *p)) {
			bi = bi*58 + BigInteger(q-s_pszBase58);
		} else
			Throw(E_INVALIDARG);
	}
	vector<byte> v((bi.Length+7)/8);
	bi.ToBytes(&v[0], v.size());
	if (v.size()>=2 && v.end()[-1]==0 && v.end()[-1]>=0x80)
		v.resize(v.size()-1);
	vector<byte> r;
	for (const char *p=s; *p==s_pszBase58[0]; ++p)
		r.push_back(0);
	r.resize(r.size()+v.size());
	std::reverse_copy(v.begin(), v.end(), r.end()-v.size());
	if (r.size() < 4)
		Throw(E_FAIL);
	SHA256 sha;
	HashValue hash = HashValue(sha.ComputeHash(sha.ComputeHash(ConstBuf(&r[0], r.size()-4))));
	if (memcmp(hash.data(), &r.end()[-4], 4))
		Throw(HRESULT_FROM_WIN32(ERROR_CRC));
	return Blob(&r[0], r.size()-4);
}

SecurityDescriptor::SecurityDescriptor(RCString s) {
	PSECURITY_DESCRIPTOR pSD;
	ULONG size;
	Win32Check(::ConvertStringSecurityDescriptorToSecurityDescriptor(s, SDDL_REVISION_1, &pSD, &size));
	m_blob = Blob(pSD, size);
	Win32Check(!::LocalFree(pSD));
}

void Zoo::RegisterNode() {
  MessagePtr msg(new Message());
  msg->set_src(rank());
  msg->set_dst(kController);
  msg->set_type(MsgType::Control_Register);
  msg->Push(Blob(&nodes_[rank()], sizeof(Node)));
  SendTo(actor::kCommunicator, msg);

  // waif for reply
  mailbox_->Pop(msg);
  CHECK(msg->type() == MsgType::Control_Reply_Register);
  CHECK(msg->data().size() == 2);
  Blob info_blob = msg->data()[0];
  Blob count_blob = msg->data()[1];
  num_workers_ = count_blob.As<int>(0);
  num_servers_ = count_blob.As<int>(1);
  worker_id_to_rank_.resize(num_workers_);
  server_id_to_rank_.resize(num_servers_);
  CHECK(info_blob.size() == size() * sizeof(Node));
  memcpy(nodes_.data(), info_blob.data(), info_blob.size());
  for (auto node : nodes_) {
    if (node.worker_id != -1) {
      worker_id_to_rank_[node.worker_id] = node.rank;
    }
    if (node.server_id != -1) {
      server_id_to_rank_[node.server_id] = node.rank;
    }
  }
  Log::Debug("rank %d end register\n", Zoo::Get()->rank());
}

 /**
  * Decode the input using a particular wire format and update this Data. If wireFormat is the default wire format, also
  * set the defaultWireEncoding field to a copy of the input. (To not copy the input, see wireDecode(Blob).)
  * @param input The input byte array to be decoded.
  * @param inputLength The length of input.
  * @param wireFormat A WireFormat object used to decode the input. If omitted, use WireFormat getDefaultWireFormat().
  */
 void
 wireDecode
   (const uint8_t* input, size_t inputLength,
    WireFormat& wireFormat = *WireFormat::getDefaultWireFormat())
 {
   wireDecode(Blob(input, inputLength), wireFormat);
 }

void BlobDetector::detect()
{

    double sigmaFirst = data->getSigmaFirst();
    double sigmaStep = data->getSigmaStep();
    for (int oID = 0; oID < data->octavs.size(); oID++)
    {
        //data->octavs[oID]->genDOG();
        double sigma = sigmaFirst*(1<<oID);
        double littlesigma = 1;

        for (int layerID = 1; layerID < data->octavs[oID]->dogs.size()-1; layerID++)
        {
            unique_ptr<HarrisDetector> harrisDetector = make_unique<HarrisDetector>(data->octavs[oID]->layers[layerID].get());
            harrisDetector->configure(0.01,0.06,1);
            ImageMap* img =  data->octavs[oID]->dogs[layerID].get();
            for (int x=0;x<img->getWidth();x++)
            {
                for (int y=0;y<img->getHeight();y++)
                {
                    bool isMax = true;
                    bool isMin = true;
                    double val = img->getData(x,y);//* sigma;
                    if(val<0.031 && val>-0.031) continue;
                    //double ds =  sigma/sigmaStep;
                    //int dl = layerID;
                    for (int dl = layerID-1; dl <= layerID+1; dl++)
                    {
                        ImageMap* img1 =  data->octavs[oID]->dogs[dl].get();
                        for(int dx = x-1; dx <= x+1; dx++)
                        {
                            for(int dy = y-1; dy <= y+1; dy++)
                            {
                                double val1 = img1->getData(dx,dy);//*ds;
                                if (dx != x || dy != y || dl != layerID)
                                {
                                    isMax &= (val1 < val);
                                    isMin &= (val1 > val);
                                }

                            }
                        }
                      //  ds*=sigmaStep;
                    }
                    if (isMax || isMin)
                    {
                        Blob b = Blob(x,y,sigma,val);
                        b.scale = (oID);
                        data->blobs.push_back(b);
                        data->blobs[data->blobs.size()-1].isClone = false;
                        data->descriptors.push_back(harrisDetector->calcDescriptor(littlesigma,&(data->blobs[data->blobs.size()-1])));
                    }
               }
          }
            littlesigma*=sigmaStep;
            sigma*=sigmaStep;
       }
    }
}

UTF8 JSON::generate(Error& error) const
{
	Buffer buf(0);
	HOutputStream out = NewObject(MemoryOutputStream, buf);
	generate(error, out);
	out->twrite(error,'\0');
	return UTF8(Blob(buf));
}