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Filename : gd_io_stream.h
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/* *****************************************************************************
** Initial file written and documented by:
** Kevin Shepherd <kshepherd@php.net> December 2007
** of Scarlet Line http://www.scarletline.com/
*******************************************************************************/
/** \file gd_io_stream.h
	\brief C++ standard library iostream specializations of gdIOCtx.

	Note that all of the methods defined in this header are internal to the
	libgd library, except for the constructors.
	Only the constructors are needed by a user of the libgd API.
	This file does not use or need gdpp.h, but if GD::Image is
	used, then C++ coding becomes even simpler, and the classes below
	become entirely hidden implementation details.
	Example usage, convert png to gif:
	#include <fstream>
	#include "gd_io_stream.h"
	std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
	if (in.good())
		{
		istreamIOCtx _in_ctx(in);
		gdImagePtr im_in = gdImageCreateFromPngCtx ( & _in_ctx);
		std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
		ostreamIOCtx _out_ctx(out);
		gdImageGifCtx(im_in, & _out_ctx);
		}
	gdImageDestroy(im_in);
*/
#ifndef _gd_io_stream_h
#define _gd_io_stream_h
#ifdef __cplusplus

#include "gd.h"
#include <iostream>

/** Standard library input stream specialization of gdIOCtx
*/
class BGD_EXPORT_DATA_IMPL istreamIOCtx : public gdIOCtx
{
public:
	typedef std::istream	stream_type;
	/** Construct an instance of this input stream specialization,
		given an input stream.
		For example:
		std::ifstream in("image.png", std::ios_base::in | std::ios_base::binary );
		istreamIOCtx in_ctx(in);
	*/
	istreamIOCtx(stream_type & __stream) {
		init( & __stream);
	}

	static int	Getbuf(gdIOCtxPtr ctx, void *buf, int size);
	static int	Putbuf(gdIOCtxPtr, const void *, int);
	static void	Putchar(gdIOCtxPtr, int);
	static int	Getchar(gdIOCtxPtr ctx);
	static int	Seek(gdIOCtxPtr ctx, const int pos);
	static long	Tell(gdIOCtxPtr ctx);
	static void	FreeCtx(gdIOCtxPtr ctx);

	void init(stream_type * __stream) {
		getC = Getchar;
		putC = Putchar;
		getBuf = Getbuf;
		putBuf = Putbuf;
		tell = Tell;
		seek = Seek;
		gd_free = FreeCtx;
		_M_stream = __stream;
	}
private:
	stream_type *	_M_stream;
};
/** Allocate a new instance of the class
*/
inline gdIOCtxPtr gdNewIstreamCtx(std::istream *__stream)
{
	return new istreamIOCtx(* __stream);
}

/** Standard library output stream specialization of gdIOCtx
*/
class BGD_EXPORT_DATA_IMPL ostreamIOCtx : public gdIOCtx
{
public:
	typedef std::ostream	stream_type;
	/** Construct an instance of this output stream specialization,
		given an output stream.
		For example:
		std::ofstream out("image.gif", std::ios_base::out | std::ios_base::binary );
		ostreamIOCtx out_ctx(out);
	*/
	ostreamIOCtx(stream_type & __stream) {
		init( & __stream);
	}

	static int	Getbuf(gdIOCtxPtr, void *, int);
	static int	Putbuf(gdIOCtxPtr ctx, const void *buf, int size);
	static int	Getchar(gdIOCtxPtr);
	static void	Putchar(gdIOCtxPtr ctx, int a);
	static int	Seek(gdIOCtxPtr ctx, const int pos);
	static long	Tell(gdIOCtxPtr ctx);
	static void	FreeCtx(gdIOCtxPtr ctx);

	void init(stream_type * __stream) {
		getC = Getchar;
		putC = Putchar;
		getBuf = Getbuf;
		putBuf = Putbuf;
		tell = Tell;
		seek = Seek;
		gd_free = FreeCtx;
		_M_stream = __stream;
	}
private:
	stream_type *	_M_stream;
};
/** Allocate a new instance of the class
*/
inline gdIOCtxPtr gdNewOstreamCtx(std::ostream *__stream)
{
	return new ostreamIOCtx(* __stream);
}

#endif /* __cplusplus */
#endif /* _gd_io_stream_h */