ossimKakaduCompressedTarget JPEG2000 (J2K) kdu_compressed_target that uses an ostream for writing to the file. More...

#include <ossimKakaduCompressedTarget.h>

Inheritance diagram for ossimKakaduCompressedTarget:

Public Member Functions
	ossimKakaduCompressedTarget ()
	default construtor More...

virtual	~ossimKakaduCompressedTarget ()
	virtural destructor More...

void	setStream (std::ostream *stream)
	Sets the output stream. More...

virtual bool	write (const kdu_core::kdu_byte *buf, int num_bytes)
	Write method. More...

virtual bool	start_rewrite (kdu_core::kdu_long backtrack)

virtual bool	end_rewrite ()

Private Attributes
std::ostream *	m_stream

std::streamoff	m_restorePosition

Detailed Description

ossimKakaduCompressedTarget JPEG2000 (J2K) kdu_compressed_target that uses an ostream for writing to the file.

Definition at line 27 of file ossimKakaduCompressedTarget.h.

Constructor & Destructor Documentation

◆ ossimKakaduCompressedTarget()

ossimKakaduCompressedTarget::ossimKakaduCompressedTarget ( )

default construtor

Definition at line 19 of file ossimKakaduCompressedTarget.cpp.

    : m_stream(0),
      m_restorePosition(0)
 {
 }

◆ ~ossimKakaduCompressedTarget()

ossimKakaduCompressedTarget::~ossimKakaduCompressedTarget ( )

virtual

virtural destructor

Definition at line 25 of file ossimKakaduCompressedTarget.cpp.

26 {

27 }

Member Function Documentation

◆ end_rewrite()

bool ossimKakaduCompressedTarget::end_rewrite ( )

virtual

Definition at line 89 of file ossimKakaduCompressedTarget.cpp.

References m_restorePosition, and m_stream.

 {
    bool result = false;
    if (m_stream)
    {
       m_stream->seekp(m_restorePosition, std::ios_base::beg);
       result = m_stream->good();
    }
    return result;
 }

◆ setStream()

void ossimKakaduCompressedTarget::setStream ( std::ostream * stream )

Sets the output stream.

Note the ossimKakaduCompressedTarget only uses the stream it does not take over(delete) memory on destruction.

Parameters

stream The output stream.

Definition at line 29 of file ossimKakaduCompressedTarget.cpp.

References m_restorePosition, and m_stream.

 {
    if ( stream )
    {
       m_stream = stream;
 
       //---
       // Keep track of the stream position for the start_rewrite call.
       // ostream::tellp() on windows visual studio 10 x64 fails past
       // 2^31-1(2GB) even though the std::streamoff held in the
       // std::streampos is eight bytes.
       // This call is safe as the stream is typically at 0.
       //---
       m_restorePosition = stream->tellp();
    }
 }

◆ start_rewrite()

bool ossimKakaduCompressedTarget::start_rewrite ( kdu_core::kdu_long backtrack )

virtual

Definition at line 77 of file ossimKakaduCompressedTarget.cpp.

References m_restorePosition, and m_stream.

 {
    bool result = false;
    if (m_stream)
    {
       std::streamoff off = m_restorePosition - static_cast<std::streamoff>(backtrack);
       m_stream->seekp(off, std::ios_base::beg);
       result = m_stream->good();
    }
    return result;
 }

◆ write()

bool ossimKakaduCompressedTarget::write	(	const kdu_core::kdu_byte *	buf,
		int	num_bytes
	)

virtual

Write method.

Parameters

buf	The buffer to pull from.
num_bytes	The number of bytes to write.

Returns: true on success, false on error.

Definition at line 46 of file ossimKakaduCompressedTarget.cpp.

References m_restorePosition, and m_stream.

 {
    if ( m_restorePosition == 0 )
    {
       //---
       // First write call.  Do a tellp in case the stream was moved as in the case of
       // nitf where the nitf header and nitf image header get written before we write
       // pixel data.
       //---
       m_restorePosition = m_stream->tellp();
    }
    
    bool result = false;
    if (m_stream)
    {
       m_stream->write((const char*)buf,
                       static_cast<std::streamsize>(num_bytes));
       
       //---
       // Keep track of the stream postition for the start_rewrite call.  Do it
       // manually as ostream::tellp() on windows visual studio 10 x64 fails
       // past 2^31-1(2GB) even though the std::streamoff held in the
       // std::streampos is eight bytes.
       //---
       m_restorePosition += static_cast<std::streamoff>(num_bytes);
       
       result = m_stream->good();
    }
    return result;
 }