Initial commit

qurl/qurl.go

@@ -0,0 +1,59 @@
+package qurl
+
+import (
+	"fmt"
+	"strings"
+	"time"
+)
+
+type QURL struct {
+	ID      uint64
+	URL     string
+	Created time.Time
+	IP      []byte
+	Browser string
+}
+
+const alpha = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+const alphalen = uint64(len(alpha))
+
+func ToString(v uint64) string {
+	var r strings.Builder
+	var i uint64
+	for i = v; i >= alphalen; i = (i / alphalen) - 1 {
+		r.WriteByte(alpha[i%alphalen])
+	}
+	r.WriteByte(alpha[i])
+	return r.String()
+}
+
+func FromString(s string) (uint64, error) {
+	var r uint64
+	vlen := uint64(len(s))
+
+	for i := uint64(0); i < vlen; i++ {
+		x := strings.IndexByte(alpha, s[i])
+		if x == -1 {
+			return 0, fmt.Errorf("Invalid character [%s]", s[i])
+		}
+
+		if i == 0 {
+			r += uint64(x)
+		} else {
+			r += (uint64(x+1) * pow(alphalen, i))
+		}
+	}
+	return r, nil
+}
+
+func pow(a, b uint64) uint64 {
+	p := uint64(1)
+	for b > 0 {
+		if b&1 != 0 {
+			p *= a
+		}
+		b >>= 1
+		a *= a
+	}
+	return p
+}