bmp generator (2x2)

bmp-gen.c

#include <stdlib.h>
#include <stdio.h>

#define BITMAP_SIZE 16

struct __attribute__((__packed__)) bmpHeader {
	short BM;		//const "BM"
	unsigned int fileSize;	// oblicz se xD
	unsigned int reserved;	// byle co, nawet papiesz
	unsigned int bitmapOffset;
};

struct dibHeader {
	unsigned int dibSize;
	int width;
	int height;
  short planes;   // statyczne 1
	short bps;			// bits per pixel (24 git gud)
	int BI_RGB;			// kompresja (statyczne 0)
	unsigned int bitmapDataSize;	// w bajtach, surowe dane bitmapy
	unsigned int DPI_horizontal;
	unsigned int DPI_vertical;
	unsigned int paletteColors;
	unsigned int importantColors;	// jesteś tak ważny, jak kolory w mojej palecie :3
};

int main(){
	struct bmpHeader BMP_Header;
	struct dibHeader DIB_Header;

	// init BMP_Header;
	BMP_Header.BM = 0x4D42;
	BMP_Header.fileSize = (sizeof(struct bmpHeader) + sizeof(struct dibHeader) + BITMAP_SIZE) - 2;
	BMP_Header.reserved = 0;
	BMP_Header.bitmapOffset = (sizeof(struct bmpHeader) + sizeof(struct dibHeader));

	// init DIB_Header;
	DIB_Header.dibSize = sizeof(struct dibHeader);
	DIB_Header.width = 2;
	DIB_Header.height = 2; // fight me
	DIB_Header.planes = 1;
	DIB_Header.bps = 24;
	DIB_Header.BI_RGB = 0;
	// DIB_Header.bitmapDataSize (później)
	DIB_Header.DPI_horizontal = 2835;
	DIB_Header.DPI_vertical = 2835;
	DIB_Header.paletteColors = 0;
	DIB_Header.importantColors = 0;

	// bitmap itself
	char* bitmapArray = malloc(BITMAP_SIZE);
	for(int i = 0; i<BITMAP_SIZE; i++){ // tymczasowo
		bitmapArray[i] = 0xAB;
	};

	// calculate things
	//BMP_Header.fileSize = (BMP_Header.bitmapOffset + BITMAP_SIZE) - 2;
	DIB_Header.bitmapDataSize = BITMAP_SIZE;

	// write to file
	FILE* myFileObject = fopen("./test.bmp", "wb");
	fwrite(&BMP_Header, sizeof(BMP_Header), 1, myFileObject);
	fwrite(&DIB_Header, sizeof(DIB_Header), 1, myFileObject);
	fwrite(bitmapArray, BITMAP_SIZE, 1, myFileObject);
	fclose(myFileObject);
	
	// cleanup
	free(bitmapArray);

	return 0;
}