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. More...
virtual int_type	underflow () override
	Check underflow. More...
bool	in_avail (JTimeval timeout=JTimeval::min()) const
	Check availability of input. More...

Protected Attributes
JFile	in
std::size_t	memory

Detailed Description

Input file stream buffer.

Definition at line 25 of file JFileStreamBuffer.hh.

Member Typedef Documentation

typedef traits_type::int_type JLANG::JFileInputStreamBuffer::int_type

Definition at line 32 of file JFileStreamBuffer.hh.

Constructor & Destructor Documentation

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());
    }

Member Function Documentation

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();
    } 

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);
    }

Member Data Documentation

JFile JLANG::JFileInputStreamBuffer::in

protected

Definition at line 100 of file JFileStreamBuffer.hh.

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