inline encode() in fromByteArray()

lib/b64.js

@@ -68,12 +68,8 @@ function toByteArray (b64) {
   return arr
 }
 
-function encode (num) {
-  return lookup[num]
-}
-
 function tripletToBase64 (num) {
-  return encode(num >> 18 & 0x3F) + encode(num >> 12 & 0x3F) + encode(num >> 6 & 0x3F) + encode(num & 0x3F)
+  return lookup[num >> 18 & 0x3F] + lookup[num >> 12 & 0x3F] + lookup[num >> 6 & 0x3F] + lookup[num & 0x3F]
 }
 
 function encodeChunk (uint8, start, end) {
@@ -104,15 +100,15 @@ function fromByteArray (uint8) {
   switch (extraBytes) {
     case 1:
       temp = uint8[uint8.length - 1]
-      output += encode(temp >> 2)
-      output += encode((temp << 4) & 0x3F)
+      output += lookup[temp >> 2]
+      output += lookup[(temp << 4) & 0x3F]
       output += '=='
       break
     case 2:
       temp = (uint8[uint8.length - 2] << 8) + (uint8[uint8.length - 1])
-      output += encode(temp >> 10)
-      output += encode((temp >> 4) & 0x3F)
-      output += encode((temp << 2) & 0x3F)
+      output += lookup[temp >> 10]
+      output += lookup[(temp >> 4) & 0x3F]
+      output += lookup[(temp << 2) & 0x3F]
       output += '='
       break
     default: