add support for 3 byte slices

Previous implementation didn't support the three byte encoded headers found in incoming packets

habbgo/utils/encoding/base64.go

@@ -7,12 +7,31 @@ This implementation is a Golang port of the examples from Puomi's wiki for Base6
 */
 package encoding
 
-// EncodeB64 takes an integer, encodes it in FUSE-Base64 & returns a slice of bytes that should contain two char's.
-func EncodeB64(i int) []byte {
-	return []byte{byte(i/64 + 64), byte(i%64 + 64)}
+import "math"
+
+// EncodeB64 takes an integer, encodes it in FUSE-Base64 & returns a slice of length number of bytes.
+func EncodeB64(i int, length int) []byte {
+	bytes := make([]byte, length)
+	for j := 1; j <= length; j++ {
+		k := uint((length - j) * 6)
+		bytes[j-1] = byte(0x40 + ((i >> k) & 0x3f))
+	}
+	return bytes
 }
 
 // DecodeB64 take a slice of bytes, decodes it from FUSE-Base64 & returns the decoded bytes as an integer.
 func DecodeB64(bytes []byte) int {
-	return 64 * (int(bytes[0]%64) + int(bytes[1]%64))
+	decodedVal := 0
+	counter := 0
+
+	for i := len(bytes) - 1; i >= 0; i-- {
+		x := int(bytes[i] - 0x40)
+		if counter > 0 {
+			x *= int(math.Pow(64.0, float64(counter)))
+		}
+		decodedVal += x
+		counter++
+	}
+
+	return decodedVal
 }