#include "gd_io_stream.h"

#ifdef __cplusplus

/**	Read into buffer from stream
	Return the number of bytes successfully read.  
	If an error occurs, or the end-of-file is reached, the return value
	is a short byte	count (or zero).
*/
int	istreamIOCtx::Getbuf (struct gdIOCtx * ctx, void * buf, int size)
	{
	stream_type * _str = ( (istreamIOCtx * ) ctx )->_M_stream;
	_str->read((char * )buf, size);
	return _str->gcount();
	}
/**	Write from buffer to stream
	Return the number of bytes successfully written.  
	If an error occurs, or the end-of-file is reached, the return value
	is a short byte	count (or zero).
*/
int	istreamIOCtx::Putbuf (struct gdIOCtx * , const void * , int )
	{
	return 0;
	}

/**	Reads the next character from stream and returns it as an
	unsigned char cast to an int, or EOF on end of file or error.
*/
int	istreamIOCtx::Getchar (struct gdIOCtx * ctx)
	{
	stream_type * _str = ( (istreamIOCtx * ) ctx )->_M_stream;
	return _str->get();
	}
/**	Write the character to stream
	Character is cast to unsigned char before writing
*/
void	istreamIOCtx::Putchar (struct gdIOCtx * , int )
	{
	}

/** Seek to position offset from the beginning of the stream
	must return 1 on SUCCESS, 0 on FAILURE. Unlike fseek! 
*/
int	istreamIOCtx::Seek (struct gdIOCtx * ctx, const int pos)
	{
	stream_type * _str = ( (istreamIOCtx * ) ctx )->_M_stream;
	_str->seekg(pos);
	return !_str->fail();
	}
/** Obtains the current value of the stream position.
	Returns -1 on error.
*/
long	istreamIOCtx::Tell (struct gdIOCtx * ctx)
	{
	stream_type * _str = ( (istreamIOCtx * ) ctx )->_M_stream;
	return _str->tellg();
	}

void	istreamIOCtx::FreeCtx (struct gdIOCtx * ctx)
	{
	delete (istreamIOCtx * )ctx;
	}

/**	Read into buffer from stream
	Return the number of bytes successfully read.  
	If an error occurs, or the end-of-file is reached, the return value
	is a short byte	count (or zero).
*/
int	ostreamIOCtx::Getbuf (struct gdIOCtx * , void * , int )
	{
	return 0;
	}
/**	Write from buffer to stream
	Return the number of bytes successfully written.  
	If an error occurs, or the end-of-file is reached, the return value
	is a short byte	count (or zero).
*/
int	ostreamIOCtx::Putbuf (struct gdIOCtx * ctx, const void * buf, int size)
	{
	stream_type * _str = ( (ostreamIOCtx * ) ctx )->_M_stream;
	_str->write((const char * )buf, size);
	return _str->bad()?0:size;
	}

/**	Reads the next character from stream and returns it as an
	unsigned char cast to an int, or EOF on end of file or error.
*/
int	ostreamIOCtx::Getchar (struct gdIOCtx * )
	{
	return EOF;
	}
/**	Write the character to stream
	Character is cast to unsigned char before writing
*/
void	ostreamIOCtx::Putchar (struct gdIOCtx * ctx, int c)
	{
	stream_type * _str = ( (ostreamIOCtx * ) ctx )->_M_stream;
	_str->put((char)c);
	}

/** Seek to position offset from the beginning of the stream
	must return 1 on SUCCESS, 0 on FAILURE. Unlike fseek! 
*/
int	ostreamIOCtx::Seek (struct gdIOCtx * ctx, const int pos)
	{
	stream_type * _str = ( (ostreamIOCtx * ) ctx )->_M_stream;
	_str->seekp(pos);
	return !_str->fail();
	}
/** Obtains the current value of the stream position.
	Returns -1 on error.
*/
long	ostreamIOCtx::Tell (struct gdIOCtx * ctx)
	{
	stream_type * _str = ( (ostreamIOCtx * ) ctx )->_M_stream;
	return _str->tellp();
	}

void	ostreamIOCtx::FreeCtx (struct gdIOCtx * ctx)
	{
	delete (ostreamIOCtx * )ctx;
	}

#endif // __cplusplus