untest implementation of @deplinenoise's amiga checksum

gistfile1.c

#include <stdio.h>
#include <arpa/inet.h> // for htonl
int main(int argc, char **argv){
	unsigned int c=0,d,i,block[256]={0};
	fread(block,1,1024,fopen(argv[1],"rb"));
	for (i=0;i<256;++i) 
		if (c > (d=c+htonl(block[i]))) c=d+1; else c=d;
	block[1]=htonl(c)^0xffffffff;
	fwrite(block,1,1024,fopen(argv[2],"wb"));
	return 0;
}