#include "gdpp.h"
#ifdef __cplusplus

namespace GD
	{
	bool Image::CreateFrom(FILE * in)
		{
		bool rtn;
		int c = fgetc(in);
		ungetc(c, in);
		switch (c)
			{
		/* PNG
		The first eight bytes of a PNG file always contain the following (decimal) values:
		   0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
		   == .PNG\r\n.\n
		*/
		case 0x89: // PNG
			rtn = CreateFromPng(in);
			break;
		/* GIF
			0x47 0x49 0x46
		*/
		case 0x47: // GIF
			rtn = CreateFromGif(in);
			break;
		/* JPEG
		A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0,
		    followed by two variable bytes (often hex 00 10), followed by 'JFIF'.		
		*/
		case 0xFF: // JPEG
			rtn = CreateFromJpeg(in);
			break;
		/* WBMP
		WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type		
		*/
		case 0x00: // WBMP
			rtn = CreateFromWBMP(in);
			break;
		/* GD2
			0x67 0x64 0x32 0x00 
			== GD2\0
		Starts with gd2 
		*/
		case 0x67: // GD2
			rtn = CreateFromGd2(in);
			break;
		/* GD
			0xFF 0xFE
			or 
			0xFF 0xFF 
			Conflicts with Jpeg
		*/
		/* XBM
			#define test_width 16
			#define test_height 7
		*/	
		case 0x23: // XBM
			rtn = CreateFromXbm(in);
			break;
		default:
			rtn = false;
			break;
			}
		return rtn; 
		}

	bool Image::CreateFrom(std::istream & in)
		{
		bool rtn;
		switch (in.peek())
			{
		/* PNG
		The first eight bytes of a PNG file always contain the following (decimal) values:
		   0x89 0x50 0x4E 0x47 0x0D 0x0A 0x1A 0x0A
		   == .PNG\r\n.\n
		*/
		case 0x89: // PNG
			rtn = CreateFromPng(in);
			break;
		/* GIF
			0x47 0x49 0x46
		*/
		case 0x47: // GIF
			rtn = CreateFromGif(in);
			break;
		/* JPEG
		A JFIF-standard file will start with the four bytes (hex) FF D8 FF E0,
		    followed by two variable bytes (often hex 00 10), followed by 'JFIF'.		
		*/
		case 0xFF: // JPEG
			rtn = CreateFromJpeg(in);
			break;
		/* WBMP
		WBMP Type 0: B/W, Uncompressed bitmap is the only gd supported type		
		*/
		case 0x00: // WBMP
			rtn = CreateFromWBMP(in);
			break;
		/* GD2
			0x67 0x64 0x32 0x00 
			== GD2\0
		Starts with gd2 
		*/
		case 0x67: // GD2
			rtn = CreateFromGd2(in);
			break;
		/* GD
			0xFF 0xFE
			or 
			0xFF 0xFF 
			Conflicts with Jpeg
		*/
		default:
			rtn = false;
			break;
			}
		return rtn; 
		}
	} // namespace GD
std::istream & operator>> (std::istream & in, GD::Image & img)
	{
	img.CreateFrom(in);
	return in;
	}

#endif /* __cplusplus */