#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include "CRCLib.h"

int png_signature[8] = { 0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a };
//int idat_signature[4] = { 0x, 0x, 0x, 0x}

int CheckPNG(int *addr) {
	int signature_match = 0;
	for( int i = 0; i < 8; i++ ) {
		if (addr[i] != png_signature[i]) {
			signature_match = 1;
		}
	}
	printf("%d", signature_match);
	return signature_match;

}

void main() {
	FILE *fp;
	int c;
	int myArray[255] = {};
	int i = 0;
	fp = fopen("./1.png", "rt");
	while((c = fgetc(fp)) != EOF) {
		//printf("Value: %X\n", c);
		myArray[i] = c;
		i++;
	}
	fclose(fp);
	CheckPNG(myArray);
	//printf("%d\n", CheckPNG(myArray));
	//int crcnum = crc(myArray, 19);
	//printf("%08X\n", crcnum);
}