jpeg & bmp format viewer

#define BYTE unsigned char
#define WORD unsigned int
#define DWORD unsigned long

/*STRUCTURE OF BITMAP FILE HEADER*/

/* FILE HEADER */
struct fileheader {
	char bftype[2];
	DWORD bfsize;
	WORD bfreserved1;
	WORD bfreserved2;
	DWORD bfoffbits;
	};


/* IMAGE INFORMATION HEADER */
struct bitmapinfoheader {
	DWORD bisize;
	DWORD biwidth;
	DWORD biheight;
	WORD biplanes;
	WORD bibitcount;
	DWORD bicompression;
	DWORD bisizeimage;
	DWORD bixpelspermeter;
	DWORD biypelspermeter;
	DWORD biclrused;
	DWORD biclrimportant;
	};


/* PALETTE HEADER*/
struct colortable {
	BYTE rgbblue;
	BYTE rgbgreen;
	BYTE rgbred;
	BYTE rgbreserved;
	};

void displayBMPInfo(FILE *fp) {

	unsigned long size;

	struct fileheader header;
	struct bitmapinfoheader info;
	//struct colortable table;
	//struct palettetype pal;

	/*TO CHECK THE EXISTENCE OF FILE */
	if(fp==NULL) {
		return;
		}

	fseek(fp, 0, SEEK_END);
	size = ftell(fp);
	fseek(fp, 0, SEEK_SET);
	fread(&header, 1, sizeof(header), fp);
	clrscr();

	/* TO CHECK THE SIGNATURE OF THE BITMAP FILE "BM" */
	if(header.bftype[0]!='B' || header.bftype[1]!='M') {
		 return;
		 }

	fread(&info,1,sizeof(info),fp);
	//if required the following BMP header informations can be displayed
	printf("\n\t\t\tBITMAP FILE HEADER");
	printf("\nSIZE= %d", size);
	printf("\nBMPFILE's SIGNATURE= %c",header.bftype[0]);
	printf("%c",header.bftype[1]);
	printf("\nSIZE OF BITMAPFILE= %ld",header.bfsize);
	printf("\nRESERVED1 = %d",header.bfreserved1);
	printf("\nRESERVED2 = %d",header.bfreserved2);
	printf("\nOFFSET TO THE IMAGE DATA = %ld",header.bfoffbits);
	printf("\n\n\t\t\tBITMAP INFO HEADER");
	printf("\n\nBITMAPINFO HEADER SIZE\t\t\t= %ld",info.bisize);
	printf("\nIMAGE WIDTH\t\t\t\t= %ld",info.biwidth);
	printf("\nIMAGE HEIGHT\t\t\t\t= %ld",info.biheight);
	printf("\nNo. OF PLANES IN THE IMAGE\t\t= %d (usually '1')",info.biplanes);
	printf("\nBITS REQUIRED TO REPRESENT A PIXEL\t= %d",info.bibitcount);
	printf("\nCOMPRESSION BIT\t\t\t\t= %ld (0 -if no Compression used)",info.bicompression);
	printf("\nBYTES REQUIRED FOR IMAGE DATA ALONE\t= %ld",info.bisizeimage);
	printf("\nbixpelspermeter\t\t\t\t= %ld",info.bixpelspermeter);
	printf("\nbiypelspermeter\t\t\t\t= %ld",info.biypelspermeter);
	printf("\nNo. OF COLORS USED\t\t\t= %ld",info.biclrused);
	printf("\nCOLOR IMPORTANT\t\t\t\t= %ld",info.biclrimportant);
	}