DataStreams.cpp

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#include "blocxx/BLOCXX_config.h"
#include "blocxx/Types.hpp"
#include "blocxx/DataStreams.hpp"
#include <cstring>

namespace BLOCXX_NAMESPACE
{

int
DataIStreamBuf::underflow()
{
   return (gptr() < egptr()) ? static_cast<unsigned char>(*gptr()) : EOF;  // need a static_cast so a -1 doesn't turn into an EOF
}

std::streambuf::pos_type
DataIStreamBuf::seekoff(off_type off, std::ios_base::seekdir way, std::ios_base::openmode which)
{
   pos_type ret = pos_type(off_type(-1));

   char* begin = eback();
   char* cur = gptr();
   char* end = egptr();

   off_type newOff = 0;

   if (way == std::ios_base::cur)
   {
      newOff = cur - begin;
   }
   else if (way == std::ios_base::end)
   {
      newOff = end - begin;
   }

   if (newOff + off >= 0 && end - begin >= newOff + off)
   {
      setg(begin, begin + newOff + off, end);
      ret = pos_type(newOff);
   }

   return ret;
}

std::streambuf::pos_type
DataIStreamBuf::seekpos(pos_type sp, std::ios_base::openmode which)
{
   pos_type ret = pos_type(off_type(-1));

   char* begin = eback();
   char* end = egptr();

   if (sp <= end - begin)
   {
      setg(begin, begin + sp, end);
      ret = sp;
   }

   return ret;
}

DataOStreamBuf::DataOStreamBuf(size_t initialSize)
   : std::streambuf()
{
   m_bfr.reserve(initialSize);
}
int
DataOStreamBuf::overflow(int c)
{
   m_bfr.push_back(c);
   return 0;
}
std::streamsize
DataOStreamBuf::xsputn(const char* s, std::streamsize n)
{
   m_bfr.insert(m_bfr.end(), s, s+n);
   return n;
}

} // end namespace BLOCXX_NAMESPACE