Optimize asciiWrite

Author: chjj

index.js

@@ -869,7 +869,15 @@ function utf8Write (buf, string, offset, length) {
 }
 
 function asciiWrite (buf, string, offset, length) {
-  return blitBuffer(asciiToBytes(string), buf, offset, length)
+  if (length > string.length) {
+    length = string.length
+  }
+
+  for (let i = 0; i < length; i++) {
+    buf[offset + i] = string.charCodeAt(i)
+  }
+
+  return length
 }
 
 function base64Write (buf, string, offset, length) {
@@ -2050,15 +2058,6 @@ function utf8ToBytes (string, units) {
   return bytes
 }
 
-function asciiToBytes (str) {
-  const byteArray = []
-  for (let i = 0; i < str.length; ++i) {
-    // Node's code seems to be doing this and not & 0x7F..
-    byteArray.push(str.charCodeAt(i) & 0xFF)
-  }
-  return byteArray
-}
-
 function utf16leToBytes (str, units) {
   let c, hi, lo
   const byteArray = []