OW_DataStreams.hpp

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#ifndef OW_DATA_STREAMS_HPP_INCLUDE_GUARD_
#define OW_DATA_STREAMS_HPP_INCLUDE_GUARD_
#include "OW_config.h"
#include "OW_Types.hpp"
#if defined(OW_HAVE_ISTREAM) && defined(OW_HAVE_OSTREAM)
#include <istream>
#include <ostream>
#else
#include <iostream>
#endif
#if defined(OW_HAVE_STREAMBUF)
#include <streambuf>
#elif defined(OW_HAVE_STREAMBUF_H)
#include <streambuf.h>
#endif
#include <vector>

// The classes and functions defined in this file are not meant for general
// use, they are internal implementation details.  They may change at any time.

namespace OW_NAMESPACE
{

class OW_COMMON_API DataIStreamBuf : public std::streambuf
{
public:
   DataIStreamBuf(int dataLen, const unsigned char* data) :
      std::streambuf()
   {
      setg(const_cast<char*>(reinterpret_cast<const char*>(data)),
         const_cast<char*>(reinterpret_cast<const char*>(data)),
         const_cast<char*>(reinterpret_cast<const char*>(data+dataLen)));
   }
protected:
   int underflow()
   {
      return (gptr() < egptr()) ? static_cast<unsigned char>(*gptr()) : EOF;  // need a static_cast so a -1 doesn't turn into an EOF
   }
};
class OW_COMMON_API DataIStreamBase
{
protected:
   DataIStreamBase(int dataLen, const unsigned char* data) : m_strbuf(dataLen, data) {}
   DataIStreamBuf m_strbuf;
};
class OW_COMMON_API DataIStream : private DataIStreamBase, public std::istream
{
public:
   DataIStream(int dataLen, const unsigned char* data)
   : DataIStreamBase(dataLen, data) 
   , std::basic_istream<char, std::char_traits<char> >(&m_strbuf) {}
};
class OW_COMMON_API DataOStreamBuf : public std::streambuf
{
public:
   DataOStreamBuf(size_t initialSize = 256);
   const unsigned char* getData() const { return &m_bfr[0]; }
   int length() const { return m_bfr.size(); }
   void clear() { m_bfr.clear(); }
protected:
   virtual int overflow(int c);
   virtual std::streamsize xsputn(const char* s, std::streamsize n);
private:

#ifdef OW_WIN32
#pragma warning (push)
#pragma warning (disable: 4251)
#endif

   std::vector<unsigned char> m_bfr;

#ifdef OW_WIN32
#pragma warning (pop)
#endif

};
class OW_COMMON_API DataOStreamBase
{
protected:
   DataOStreamBase(size_t initialSize = 256)
   : m_buf(initialSize) {}

   DataOStreamBuf m_buf;
};
class OW_COMMON_API DataOStream : private DataOStreamBase, public std::ostream
{
public:
   DataOStream(size_t initialSize = 256)
      : DataOStreamBase(initialSize)
      , std::basic_ostream<char, std::char_traits<char> >(&m_buf)
   {}
   const unsigned char* getData() const { return m_buf.getData(); }
   int length() const { return m_buf.length();  }
   void clearData() { m_buf.clear(); }
};

} // end namespace OW_NAMESPACE

#endif

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