RWCompressedOStream< Compressor > Class Template Reference

Compresses data and serializes it to an associated std::streambuf. More...

#include <rw/tools/cmpstream.h>

Inheritance diagram for RWCompressedOStream< Compressor >:

Public Member Functions
	RWCompressedOStream (std::ostream &stream, std::ios_base::openmode mode=std::ios_base::out, rwuint32 block_size=2048U, const Compressor &compressor=Compressor())
	RWCompressedOStream (std::streambuf *stream_buffer, std::ios_base::openmode mode=std::ios_base::out, rwuint32 block_size=2048U, const Compressor &compressor=Compressor())
void	close ()
const Compressor &	get_compressor () const
bool	is_open () const
void	open (std::streambuf *stream_buffer, std::ios_base::openmode mode=std::ios_base::out, rwuint32 block_size=2048U)
RWCompressedStreamBuffer< Compressor > *	rdbuf () const

Detailed Description

template<class Compressor>
class RWCompressedOStream< Compressor >

Class RWCompressedOStream compresses data and serializes it to an associated std::streambuf. The results can be restored by using its counterpart RWCompressedIStream.

See also

RWCompressedStreamBuffer

Note

RWCompressedOStream can be interrogated as to the stream state using member functions std::ios::good(), std::ios::bad(), std::ios::eof(), etc.

Synopsis

#include <rw/tools/cmpstream.h>
// Construct an RWCompressedOStream using cout's streambuf
RWCompressedOStream<Compressor> cstr(std::cout);

Persistence

None

Example

// for SourcePro Core Tools Module compressed streams
#include <rw/tools/cmpstream.h>
 
// for SourcePro Core Tools Module endian streams
#include <rw/estream.h>
 
// for SourcePro Core Tools Module strings
#include <rw/cstring.h>
 
// for SourcePro Core Snappy compressor
#include <rw/tools/snappy/RWSnappyCompressor.h>
 
// for C++ Standard Library file streams
#include <fstream>
 
int main() {
  // open the file to write to
  std::ofstream output_file("output.snap", std::ios_base::binary);
 
  // layer a compressed stream on top of the file
  RWCompressedOStream<RWSnappyCompressor> compressed_stream(output_file);
 
  // layer an endian stream on top of the compressed stream
  RWeostream endian_stream(compressed_stream);
 
  //
  // Any data written to the endian stream is converted into
  // an endian safe format by the endian stream, compressed by the
  // compressed stream, and written to the file by the file stream.
  //
 
  RWCString data('a', 32);
 
  endian_stream << data;
 
  return 0;
}

Constructor & Destructor Documentation

RWCompressedOStream() [1/2]

template<class Compressor >

RWCompressedOStream< Compressor >::RWCompressedOStream ( std::streambuf * stream_buffer, std::ios_base::openmode mode = std::ios_base::out, rwuint32 block_size = 2048U, const Compressor & compressor = Compressor() )

inline

Constructor initializes and opens the underlying stream buffer with the provided stream_buffer, mode, block_size, and compressor. If the open fails, failbit is set on this stream.

Note

The mode is always combined with the appropriate flags to allow the underlying stream buffer to be used for output.

See also

RWCompressedStreamBuffer::open()

RWCompressedOStream() [2/2]

template<class Compressor >

RWCompressedOStream< Compressor >::RWCompressedOStream ( std::ostream & stream, std::ios_base::openmode mode = std::ios_base::out, rwuint32 block_size = 2048U, const Compressor & compressor = Compressor() )

inline

Constructor initializes and opens the underlying stream buffer with the provided mode, block_size, compressor, and the stream buffer associated with stream. If the open fails, failbit is set on this stream.

Note

The mode is always combined with the appropriate flags to allow the underlying stream buffer to be used for output.

See also

RWCompressedStreamBuffer::open()

Member Function Documentation

close()

template<class Compressor >

void RWCompressedOStream< Compressor >::close ( )

inline

Closes the underlying stream buffer. If the close fails, failbit is set on this stream. After this method has been called, this stream cannot be used for output until a successful call to open() has been made.

get_compressor()

template<class Compressor >

const Compressor & RWCompressedOStream< Compressor >::get_compressor ( ) const

inline

Returns a reference to the underlying stream buffer's compressor.

is_open()

template<class Compressor >

bool RWCompressedOStream< Compressor >::is_open ( ) const

inline

Returns true if the underlying stream buffer is open and is ready for use, otherwise returns false.

open()

template<class Compressor >

void RWCompressedOStream< Compressor >::open ( std::streambuf * stream_buffer, std::ios_base::openmode mode = std::ios_base::out, rwuint32 block_size = 2048U )

inline

Opens the underlying stream buffer with the provided stream_buffer, mode, and block_size. If the open fails, failbit is set on this stream.

Note

The mode is always combined with the appropriate flags to allow the underlying stream buffer to be used for output.

See also

RWCompressedStreamBuffer::open()

rdbuf()

template<class Compressor >

RWCompressedStreamBuffer< Compressor > * RWCompressedOStream< Compressor >::rdbuf ( ) const

inline

Returns a pointer to the underlying stream buffer.