In the previous hashing example, the entire file to be hashed was loaded into memory before hashing. This is not practical or even possible when files reach a certain size. Physical memory limitations will come into play. Because the hashes are implemented as a block cipher, it will operate on one chunk at a time without the need to load the entire file in memory at once:
package mainimport ( "crypto/md5" "fmt" "io" "log" "os")func printUsage() { fmt.Println("Usage: " + os.Args[0] + " <filename>") fmt.Println("Example: " + os.Args[0] + " diskimage.iso")}func checkArgs() string { if len(os.Args) < 2 { printUsage() os.Exit(1) } return os.Args[1]}func main() { filename := checkArgs() // Open file for reading file, err := ...
