JLANG::JFileInputStreamBuffer Class Reference

Input file stream buffer. More...

#include <JFileStreamBuffer.hh>

Inheritance diagram for JLANG::JFileInputStreamBuffer:

Public Types
typedef traits_type::int_type	int_type

Public Member Functions
	JFileInputStreamBuffer (const JAbstractFile &file, const std::size_t size=65536, const std::size_t put_back=8)
	Constructor.
virtual int_type	underflow () override
	Check underflow.
bool	in_avail (JTimeval timeout=JTimeval::min()) const
	Check availability of input.

Protected Attributes
JFile	in
std::size_t	memory

Private Member Functions
	JFileInputStreamBuffer (const JFileInputStreamBuffer &)
	JFileInputStreamBuffer (JFileInputStreamBuffer &&)
JFileInputStreamBuffer &	operator= (const JFileInputStreamBuffer &)
JFileInputStreamBuffer &	operator= (JFileInputStreamBuffer &&)

Detailed Description

Input file stream buffer.

Definition at line 25 of file JFileStreamBuffer.hh.

Member Typedef Documentation

int_type

traits_type::int_type JLANG::JFileInputStreamBuffer::int_type

Definition at line 32 of file JFileStreamBuffer.hh.

Constructor & Destructor Documentation

JFileInputStreamBuffer() [1/3]

JLANG::JFileInputStreamBuffer::JFileInputStreamBuffer ( const JAbstractFile & file, const std::size_t size = 65536, const std::size_t put_back = 8 )

inline

Constructor.

Parameters

file	file
size	size of internal buffer
put_back	number of put back characters

Definition at line 42 of file JFileStreamBuffer.hh.

                                                            :
      in    (file),
      memory(put_back)
    {
      resize(size + put_back),
 
      setg(this->data(), this->data(), this->data());
    }

JFileInputStreamBuffer() [2/3]

JLANG::JFileInputStreamBuffer::JFileInputStreamBuffer ( const JFileInputStreamBuffer & )

private

JFileInputStreamBuffer() [3/3]

JLANG::JFileInputStreamBuffer::JFileInputStreamBuffer ( JFileInputStreamBuffer && )

private

Member Function Documentation

underflow()

virtual int_type JLANG::JFileInputStreamBuffer::underflow ( )

inlineoverridevirtual

Check underflow.

This method reads as many bytes as possible.

Returns

first character if OK; else EOF

Definition at line 60 of file JFileStreamBuffer.hh.

    {   
      if (gptr() >= egptr()) {
 
        char* __begin = this->data();
 
        if (eback() == __begin) { 
          
          // push put back characters
 
          memmove(__begin, egptr() - memory, memory);
        
          __begin += memory;
        }
        
        const size_t len = in.read(__begin, this->size() - (__begin - this->data()));
        
        if (len != 0)
          setg(this->data(), __begin, __begin + len);
        else
          return traits_type::eof();
      }
        
      return *gptr();
    } 

in_avail()

bool JLANG::JFileInputStreamBuffer::in_avail ( JTimeval timeout = JTimeval::min() ) const

inline

Check availability of input.

This method returns true if at least one byte can be read without blocking.

Parameters

timeout

timeout

Returns

true if ready to read; else false

Definition at line 94 of file JFileStreamBuffer.hh.

    {
      return JFileDescriptorMask(in).in_avail(timeout);
    }

operator=() [1/2]

JFileInputStreamBuffer & JLANG::JFileInputStreamBuffer::operator= ( const JFileInputStreamBuffer & )

private

operator=() [2/2]

JFileInputStreamBuffer & JLANG::JFileInputStreamBuffer::operator= ( JFileInputStreamBuffer && )

private

Member Data Documentation

in

JFile JLANG::JFileInputStreamBuffer::in

protected

Definition at line 100 of file JFileStreamBuffer.hh.

memory

std::size_t JLANG::JFileInputStreamBuffer::memory

protected

Definition at line 101 of file JFileStreamBuffer.hh.

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

• JFileStreamBuffer.hh