BaseStreamBuffer.cpp

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#include "blocxx/BLOCXX_config.h"
#include "blocxx/BaseStreamBuffer.hpp"
#include "blocxx/Exception.hpp"
#include "blocxx/String.hpp"
#include "blocxx/Assertion.hpp"
#include <iostream> // for cerr
#include <cstring> // for memcpy

namespace BLOCXX_NAMESPACE
{

BaseStreamBuffer::BaseStreamBuffer(EDirectionFlag direction, size_t bufSize)
   : m_bufSize(bufSize), m_inputBuffer(NULL), m_outputBuffer(NULL)
{
   if (direction == E_IN || direction == E_IN_OUT)
   {
      m_inputBuffer = new char[m_bufSize];
      initGetBuffer();
   }
   if (direction == E_OUT || direction == E_IN_OUT)
   {
      m_outputBuffer = new char[m_bufSize];
      initPutBuffer();
   }
}
void
BaseStreamBuffer::initBuffers()
{
   initPutBuffer();
   initGetBuffer();
}
void
BaseStreamBuffer::initPutBuffer()
{
   setp(m_outputBuffer, m_outputBuffer + m_bufSize);
}
void
BaseStreamBuffer::initGetBuffer()
{
   setg(m_inputBuffer, m_inputBuffer, m_inputBuffer);
}
BaseStreamBuffer::~BaseStreamBuffer()
{
   delete [] m_inputBuffer;
   delete [] m_outputBuffer;
}
int
BaseStreamBuffer::sync()
{
   return buffer_out();
}
int
BaseStreamBuffer::buffer_out()
{
    int cnt = pptr() - pbase();
    int retval = buffer_to_device(m_outputBuffer, cnt);
    pbump(-cnt);
    return retval;
}
int
BaseStreamBuffer::overflow(int c)
{
   if (buffer_out() < 0)
   {
      return EOF;
   }
   else
   {
      if (c != EOF)
      {
         return sputc(c);
      }
      else
      {
         return c;
      }
   }
}
std::streamsize
BaseStreamBuffer::xsputn(const char* s, std::streamsize n)
{
   if (n < epptr() - pptr())
   {
      memcpy(pptr(), s, n * sizeof(char));
      pbump(n);
      return n;
   }
   else
   {
      for (std::streamsize i = 0; i < n; i++)
      {
         if (sputc(s[i]) == EOF)
         {
            return i;
         }
      }
      return n;
   }
}
int
BaseStreamBuffer::underflow()
{
    if (gptr() < egptr())
    {
        return static_cast<unsigned char>(*gptr());   // need a static_cast so a -1 doesn't turn into an EOF
    }
    if (buffer_in() < 0)
    {
        return EOF;
    }
    else
    {
        return static_cast<unsigned char>(*gptr());   // need a static_cast so a -1 doesn't turn into an EOF
    }
}
int
BaseStreamBuffer::buffer_in()
{
   int retval = buffer_from_device(m_inputBuffer,
         m_bufSize);
   if (retval <= 0)
   {
      setg(0,0,0);
      return -1;
   }
   else
   {
      setg(m_inputBuffer, m_inputBuffer, m_inputBuffer + retval);
      return retval;
   }
}
int
BaseStreamBuffer::buffer_to_device(const char* c, int n)
{
   BLOCXX_ASSERT("Not implemented, should overwrite" == 0);
   return -1; // make the compiler happy
}
int
BaseStreamBuffer::buffer_from_device(char* c, int n)
{
   BLOCXX_ASSERT("Not implemented, should overwrite" == 0);
   return -1; // make the compiler happy
}

} // end namespace BLOCXX_NAMESPACE