#include<iostream>
#include<fstream>

using namespace std;

void displayFileHeader(ifstream& fin)
{
	//1  	2  	bfType  	19778  	must always be set to 'BM' to declare that this is a .bmp-file.
	//3 	4 	bfSize 	?? 	specifies the size of the file in bytes.
	//7 	2 	bfReserved1 	0 	must always be set to zero.
	//9 	2 	bfReserved2 	0 	must always be set to zero.
	//11 	4 	bfOffBits 	1078 	specifies the offset from the beginning of the file to the bitmap data

	char bfType[3];
	unsigned int bfSize;
	unsigned short bfReserved1;
	unsigned short bfReserved2;
	unsigned int bfOffBits;

	fin.read(bfType, 2); // this should read BM
	bfType[2] = '\0';
	fin.read((char*)&bfSize,4);
	//fin.read((char*)&bfReserved1,2);
	//fin.read((char*)&bfReserved2,2);
	//fin.seekg(10);
	//fin.seekg(10,ios::beg);
	//fin.seekg(10,ios::end);
	fin.seekg(4,ios::cur);
	fin.read((char*)&bfOffBits,4);

	cout << bfType << endl;
	cout << bfSize << endl;
	//cout << bfReserved1 << endl;
	//cout << bfReserved2 << endl;
	cout << bfOffBits << endl;
}

void displayInfoHeader(ifstream& fin)
{
	//15  	4  	biSize  	40  	specifies the size of the BITMAPINFOHEADER structure, in bytes.
	//19 	4 	biWidth 	100 	specifies the width of the image, in pixels.
	//23 	4 	biHeight 	100 	specifies the height of the image, in pixels.
	//27 	2 	biPlanes 	1 	specifies the number of planes of the target device, must be set to zero.
	//29 	2 	biBitCount 	8 	specifies the number of bits per pixel.
	//31 	4 	biCompression 	0 	Specifies the type of compression, usually set to zero (no compression).
	//35 	4 	biSizeImage 	0 	specifies the size of the image data, in bytes. If there is no compression, it is valid to set this member to zero.
	//39 	4 	biXPelsPerMeter 	0 	specifies the the horizontal pixels per meter on the designated targer device, usually set to zero.
	//43 	4 	biYPelsPerMeter 	0 	specifies the the vertical pixels per meter on the designated targer device, usually set to zero.
	//47 	4 	biClrUsed 	0 	specifies the number of colors used in the bitmap, if set to zero the number of colors is calculated using the biBitCount member.
	//51 	4 	biClrImportant 	0 	specifies the number of color that are 'important' for the bitmap, if set to zero, all colors are important.

	unsigned int biSize;
	unsigned int biWidth;
	unsigned int biHeight;
	unsigned short biPlanes;
	unsigned short biBitCount;
	unsigned int biCompression;
	unsigned int biSizeImage;
	unsigned int biXPelsPerMeter;
	unsigned int biYPelsPerMeter;
	unsigned int biClrUsed;
	unsigned int biClrImportant;

	fin.read((char*)&biSize,4);
	fin.read((char*)&biWidth,4);
	fin.read((char*)&biHeight,4);
	fin.read((char*)&biPlanes,2);
	fin.read((char*)&biBitCount,2);
	fin.read((char*)&biCompression,4);
	fin.read((char*)&biSizeImage,4);
	fin.read((char*)&biXPelsPerMeter,4);
	fin.read((char*)&biYPelsPerMeter,4);
	fin.read((char*)&biClrUsed,4);
	fin.read((char*)&biClrImportant,4);

	cout << "biSize = " << biSize << endl;
	cout << "biWidth = " << biWidth << endl;
	cout << "biHeight = " << biHeight << endl;
	cout << "biPlanes = " << biPlanes << endl;
	cout << "biBitCount = " << biBitCount << endl;
	cout << "biCompression = " << biCompression << endl;
	cout << "biSizeImage = " << biSizeImage << endl;
	cout << "biXPelsPerMeter = " << biXPelsPerMeter << endl;
	cout << "biYPelsPerMeter = " << biYPelsPerMeter << endl;
	cout << "biClrUsed = " << biClrUsed << endl;
	cout << "biClrImportant = " << biClrImportant << endl;

}

void main()
{
	ifstream fin("test.bmp",ios::binary);

	displayFileHeader(fin);
	displayInfoHeader(fin);

	fin.close();
}