bmphdr.c

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#include <stdio.h>

struct bmphdr {
	char signature[2];
	int size;
	short reserved[2];
	int offset;
	int hdr_size;
	int width;
	int height;
	short nr_planes;
	short bits_per_pixel;
	int compress_type;
	int data_size;
	int resol_hori;
	int resol_vert;
	int nr_colors;
	int important_color;
} header;

int main(int argc, char *argv[])
{
	FILE *fp;
	
	if (argc != 2) {
		printf("Usage: %s <filename>\n", argv[0]);
		exit(1);
	}
	
	fp = fopen(argv[1], "r");
	if (!fp) {
		printf("File open error or such file does not exist!\n");
		exit(1);	
	}
	
	fread(header.signature, 2, 1, fp);
	if (header.signature[0] != 'B' || header.signature[1] != 'M') {
		printf("Not a bmp file!\n");
		exit(1);
	}
	
	fread(&header.size, 4, 1, fp);
	fread(header.reserved, 4, 1, fp);
	fread(&header.offset, 4, 1, fp);
	fread(&header.hdr_size, 4, 1, fp);
	fread(&header.width, 4, 1, fp);
	fread(&header.height, 4, 1, fp);
	fread(&header.nr_planes, 2, 1, fp);
	fread(&header.bits_per_pixel, 2, 1, fp);
	fread(&header.compress_type, 4, 1, fp);
	fread(&header.data_size, 4, 1, fp);
	fread(&header.resol_hori, 4, 1, fp);
	fread(&header.resol_vert, 4, 1, fp);
	fread(&header.nr_colors, 4, 1, fp);
	fread(&header.important_color, 4, 1, fp);

	fclose(fp);
	printf("signature        %c%c\n", header.signature[0], header.signature[1]);
	printf("size             %d\n", header.size);
	printf("offset           %d\n", header.offset);
	printf("hdr_size         %d\n", header.hdr_size);
	printf("width            %d\n", header.width);
	printf("height           %d\n", header.height);
	printf("nr_planes        %d\n", header.nr_planes);
	printf("bits_per_pixel   %d\n", header.bits_per_pixel);
	printf("compress_type    %d\n", header.compress_type);
	printf("data_size        %d\n", header.data_size);
	printf("resol_hori       %d\n", header.resol_hori);
	printf("resol_vert       %d\n", header.resol_vert);
	printf("nr_colors        %d\n", header.nr_colors);
	printf("important_color  %d\n", header.important_color);
	printf("\n");
	return 0;	
}