Data commit

Task/Entropy-Narcissist/Go/entropy-narcissist.go

@@ -0,0 +1,35 @@
+package main
+
+import (
+    "fmt"
+    "io/ioutil"
+    "log"
+    "math"
+    "os"
+    "runtime"
+)
+
+func main() {
+    _, src, _, _ := runtime.Caller(0)
+    fmt.Println("Source file entropy:", entropy(src))
+    fmt.Println("Binary file entropy:", entropy(os.Args[0]))
+}
+
+func entropy(file string) float64 {
+    d, err := ioutil.ReadFile(file)
+    if err != nil {
+        log.Fatal(err)
+    }
+    var f [256]float64
+    for _, b := range d {
+        f[b]++
+    }
+    hm := 0.
+    for _, c := range f {
+        if c > 0 {
+            hm += c * math.Log2(c)
+        }
+    }
+    l := float64(len(d))
+    return math.Log2(l) - hm/l
+}