rewrite-header

//rewrites the header of a bmp file
#include <stdio.h>
int main(int argc, char* argv[]) {
	unsigned char bufferOriginal[54];//wil store the header of the original file

	printf("num of cmd args: %d", argc);
	for(int i = 0; i < argc; i++) {
		printf("%d arg: %s \n", i, argv[i]);
	}



	FILE *ptrOriginal = fopen(argv[1], "rb");//pointer to the original file
	FILE *ptrNew = fopen(argv[2], "r+b");//pointer to the file that we overwrite

	if(ptrOriginal == NULL) {
		printf("couldn't open first file, exiting\n");
		return 0;
	}

	if(ptrNew == NULL) {
		printf("couldn't open second file, exiting\n");
		return 0;
	}

	fread(bufferOriginal, sizeof(bufferOriginal), 1, ptrOriginal);//saving the original header in the bufferOriginal

	printf("copied the original header\n");

	fseek(ptrNew, 0, SEEK_SET);//sets the position to the beginning of the file

	printf("writing the header to the new file\n");

	fwrite(bufferOriginal, sizeof(bufferOriginal), sizeof(bufferOriginal), ptrNew);//writing first 54 bytes from the orignal file to new file
	printf("done.\n");
return 0;
}