From: Koushik Dutta <koushd@gmail.com>
Date: Sat, 7 Dec 2019 00:28:35 +0000 (-0800)
Subject: Add fromArrayView for TypedArrays and DataViews. Fast path for Uint8Array.
X-Git-Url: https://zoso.dev/?a=commitdiff_plain;h=1df9870ea0f1fb89d2a84940464f4c4cfef053c1;p=buffer.git

Add fromArrayView for TypedArrays and DataViews. Fast path for Uint8Array.
---

diff --git a/index.js b/index.js
index 19b0468..cb712b1 100644
--- a/index.js
+++ b/index.js
@@ -127,7 +127,7 @@ function from (value, encodingOrOffset, length) {
   }
 
   if (ArrayBuffer.isView(value)) {
-    return fromArrayLike(value)
+    return fromArrayView(value)
   }
 
   if (value == null) {
@@ -269,6 +269,14 @@ function fromArrayLike (array) {
   return buf
 }
 
+function fromArrayView (arrayView) {
+  if (isInstance(arrayView, Uint8Array)) {
+    var copy = Uint8Array.from(arrayView)
+    return fromArrayBuffer(copy.buffer, copy.byteOffset, copy.byteLength)
+  }
+  return fromArrayLike(arrayView)
+}
+
 function fromArrayBuffer (array, byteOffset, length) {
   if (byteOffset < 0 || array.byteLength < byteOffset) {
     throw new RangeError('"offset" is outside of buffer bounds')