TrigSteeringEvent::StringSerializer Class Reference

Utility class (not a tool or so) to serialize strings into stream of 32bit integers. More...

#include <StringSerializer.h>

Collaboration diagram for TrigSteeringEvent::StringSerializer:

Public Member Functions
void	serialize (const std::vector< std::string > &strings, std::vector< uint32_t > &storage)
	Serializes vector of strings into vector of integers.
void	serialize (const std::string &str, std::vector< uint32_t > &storage)
std::size_t	deserialize (std::vector< uint32_t >::const_iterator first, std::vector< uint32_t >::const_iterator last, std::vector< std::string > &strings)
	Deserialize vector into strings.
std::size_t	deserialize (const std::vector< uint32_t > &storage, std::vector< std::string > &strings)
	Same as above but with vector instead of iterators.
std::size_t	deserialize (std::vector< uint32_t >::const_iterator first, std::vector< uint32_t >::const_iterator last, std::string &str)
	Deserialize one single string.
std::size_t	deserialize (const std::vector< uint32_t > &storage, std::string &str)
	Deserialize one single string.
unsigned int	inquireSize (const std::vector< uint32_t > &storage)
	Return number of strings serialized into 'storage'.

Private Member Functions
unsigned int	getPadding (unsigned int sizeToReserve)
	Get number of padding bytes needed to align with uint32_t.

Private Attributes
std::ostringstream	m_ostream
	sstream used in serialization
std::istringstream	m_istream
	sstream used in de-serialization

Static Private Attributes
static const char *const	s_delimiter = "\n"
	default delimeter which is put between strings from the input vector while serialization happens

Detailed Description

Utility class (not a tool or so) to serialize strings into stream of 32bit integers.

Definition at line 22 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

Member Function Documentation

deserialize() [1/4]

std::size_t TrigSteeringEvent::StringSerializer::deserialize ( const std::vector< uint32_t > & storage, std::string & str )

inline

Deserialize one single string.

Definition at line 62 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

                                                                              {
    return deserialize(storage.begin(), storage.end(), str);
  }

deserialize() [2/4]

std::size_t TrigSteeringEvent::StringSerializer::deserialize ( const std::vector< uint32_t > & storage, std::vector< std::string > & strings )

inline

Same as above but with vector instead of iterators.

Definition at line 52 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

                                                                                             {
    return deserialize(storage.begin(), storage.end(), strings);
  }

deserialize() [3/4]

std::size_t StringSerializer::deserialize	(	std::vector< uint32_t >::const_iterator	first,
		std::vector< uint32_t >::const_iterator	last,
		std::string &	str )

Deserialize one single string.

Definition at line 102 of file TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx.

{
  std::vector<std::string> tmp;
  std::size_t nWords = deserialize(first, last, tmp); 
  if (tmp.size() == 1 )
    str = tmp[0];
 
  return nWords;
}

deserialize() [4/4]

std::size_t StringSerializer::deserialize	(	std::vector< uint32_t >::const_iterator	first,
		std::vector< uint32_t >::const_iterator	last,
		std::vector< std::string > &	strings )

Deserialize vector into strings.

Parameters

first	Beginning of 'byte-stream'
last	End of 'byte-stream', i.e. vector::end()
strings	Vector of strings to hold result

Returns

Number of words consumed during deserialization

Definition at line 64 of file TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx.

{
  std::size_t storageSize = std::distance(first, last);
  
  if ( storageSize <= 1 ) return storageSize;
  unsigned int numOfStrings = *first;
 
  /*
    unsigned int i;
    std::cerr << "deserialized: " << std::endl;
    for ( i = 0 ; i < storage.size()-1; ++i ) {
    std::cerr << " " << std::hex << uarray[i] ;
    }
    std::cerr << " " << std::dec << std::endl;
  */
  
  std::string whole(reinterpret_cast<const char*>(&*(first+1)),
                    (storageSize-1)*sizeof(uint32_t));
 
  m_istream.clear();  // istream reset
  m_istream.str(whole);
 
  std::string one;
  unsigned int readInStrings=0;
  std::size_t nChars=0;
  
  while ( m_istream.good() && readInStrings < numOfStrings ) {
    getline(m_istream, one, s_delimiter[0]);
    strings.push_back(one);
    readInStrings++;
    nChars += one.size() + 1;
  }
  
  return 1 + (nChars+getPadding(nChars))/sizeof(uint32_t);  // # uint32_t words (incl. header)
}

getPadding()

unsigned int TrigSteeringEvent::StringSerializer::getPadding ( unsigned int sizeToReserve )

inlineprivate

Get number of padding bytes needed to align with uint32_t.

Definition at line 76 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

                                                      {
    return (sizeof(uint32_t) - sizeToReserve%sizeof(uint32_t)) % sizeof(uint32_t);
  }

inquireSize()

unsigned int StringSerializer::inquireSize

(

const std::vector< uint32_t > &

storage

)

Return number of strings serialized into 'storage'.

Definition at line 114 of file TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx.

                                                                             {
  if ( storage.size() <= 1 )
    return 0;
  return storage[0];
}

serialize() [1/2]

void StringSerializer::serialize	(	const std::string &	str,
		std::vector< uint32_t > &	storage )

Definition at line 59 of file TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx.

                                                                                     {
  std::vector<std::string> tmp(1, str);
  return serialize(tmp, storage);
}

serialize() [2/2]

void StringSerializer::serialize	(	const std::vector< std::string > &	strings,
		std::vector< uint32_t > &	storage )

Serializes vector of strings into vector of integers.

The number of strings (size of input vector) is put first into the stream. In case the strings is an empty vector the 0 is put into the storage.

Parameters

strings
storage	is place where serizlized from of stings is appended to

Definition at line 15 of file TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx.

                                                                                                    {
 
  m_ostream.str(""); // ostream reset
  
  // copy strings into m_ostream with delimiter after each element (even after last element)
  copy(strings.begin(), strings.end(), std::ostream_iterator<std::string>(m_ostream, s_delimiter));
  
  /*  
      unsigned int i;
      for ( i = 0 ; i < strings.size() ; ++i) {
      std::cerr << "ser: " << strings[i] << std::endl;
      }
  */
  
  unsigned sizeToReserve = m_ostream.str().size();
  
  // Pad with '\n'
  unsigned int sizeToPad = getPadding(sizeToReserve);
  
  if ( sizeToPad != 0 ) {
    sizeToReserve += sizeToPad;
    for ( unsigned i = 0 ; i < sizeToPad; i++ )
      m_ostream << s_delimiter;
  }
  m_ostream.flush();
  
  std::string s (m_ostream.str());
  const uint32_t * uarray = reinterpret_cast<const uint32_t*> (s.data());
 
  storage.push_back(strings.size()); // put number of strings first
  storage.insert(storage.end(), &uarray[0], &uarray[sizeToReserve/sizeof(uint32_t)]);
 
  /*
  std::cerr << "reserved = " << sizeToReserve << ", pad = " << sizeToPad
            << ", storage size = " << storage.size() << ", serialized: " << std::endl;
  
  for ( unsigned int i = 0 ; i < sizeToReserve; ++i ) {
    std::cerr << " " << std::hex << (int)carray[i] << std::dec << "(" << (char)carray[i] << ")";
  }
  std::cerr << " " << std::dec << std::endl;
  */
  
}

Member Data Documentation

m_istream

std::istringstream TrigSteeringEvent::StringSerializer::m_istream

private

sstream used in de-serialization

Definition at line 81 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

m_ostream

std::ostringstream TrigSteeringEvent::StringSerializer::m_ostream

private

sstream used in serialization

Definition at line 80 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

s_delimiter

const char *const StringSerializer::s_delimiter = "\n"

staticprivate

default delimeter which is put between strings from the input vector while serialization happens

Definition at line 82 of file TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h.

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The documentation for this class was generated from the following files:

• TrigEvent/TrigSteeringEvent/TrigSteeringEvent/StringSerializer.h
• TrigEvent/TrigSteeringEvent/src/StringSerializer.cxx