BMP file dimensions

bmp.c

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

int main(int argc, char* argv[]) {
	int width, height;
	unsigned char data[8];
	FILE *file;

	if (argc < 2) {
		fprintf (stderr, "Missing arguments\n");
		return EXIT_FAILURE;
	}

	file = fopen(argv[1], "r");
	if (!file) {
		fprintf (stderr, "Could not open '%s'.\n", argv[1]);
		return EXIT_FAILURE;
	}

	if (fseek (file, 16, SEEK_SET)) {
		fprintf (stderr, "Could not seek\n");
		fclose (file);
		return EXIT_FAILURE;
	}

	if (fread (data, 8, 1, file) != 1) {
		fprintf (stderr, "Could not read dimensions.\n");
		fclose (file);
		return EXIT_FAILURE;
	}

	width =  data[3] + (data[2] << 8) + (data[1] << 16) + (data[0] << 24);
	height = data[7] + (data[6] << 8) + (data[5] << 16) + (data[4] << 24);

	printf ("Width: %d\nHeight: %d\n", width, height);

	fclose (file);

	return EXIT_SUCCESS;
}