From: Feross Aboukhadijeh <feross@feross.org>
Date: Wed, 5 Aug 2015 12:44:46 +0000 (+0200)
Subject: ArrayBuffer support in Buffer constructor
X-Git-Url: https://zoso.dev/?a=commitdiff_plain;h=03915663ef04a7bbae88524faecbcdbfef793568;p=buffer.git

ArrayBuffer support in Buffer constructor
---

diff --git a/index.js b/index.js
index 10931c6..d72a180 100644
--- a/index.js
+++ b/index.js
@@ -130,8 +130,13 @@ function fromObject (that, object) {
     throw new TypeError('must start with number, buffer, array or string')
   }
 
-  if (typeof ArrayBuffer !== 'undefined' && object.buffer instanceof ArrayBuffer) {
-    return fromTypedArray(that, object)
+  if (typeof ArrayBuffer !== 'undefined') {
+    if (object.buffer instanceof ArrayBuffer) {
+      return fromTypedArray(that, object)
+    }
+    if (object instanceof ArrayBuffer) {
+      return fromArrayBuffer(that, object)
+    }
   }
 
   if (object.length) return fromArrayLike(that, object)
@@ -168,6 +173,18 @@ function fromTypedArray (that, array) {
   return that
 }
 
+function fromArrayBuffer (that, array) {
+  if (Buffer.TYPED_ARRAY_SUPPORT) {
+    // Return an augmented `Uint8Array` instance, for best performance
+    array.byteLength
+    that = Buffer._augment(new Uint8Array(array))
+  } else {
+    // Fallback: Return an object instance of the Buffer class
+    that = fromTypedArray(that, new Uint8Array(array))
+  }
+  return that
+}
+
 function fromArrayLike (that, array) {
   var length = checked(array.length) | 0
   that = allocate(that, length)
@@ -459,13 +476,13 @@ Buffer.prototype.indexOf = function indexOf (val, byteOffset) {
   throw new TypeError('val must be string, number or Buffer')
 }
 
-// `get` will be removed in Node 0.13+
+// `get` is deprecated
 Buffer.prototype.get = function get (offset) {
   console.log('.get() is deprecated. Access using array indexes instead.')
   return this.readUInt8(offset)
 }
 
-// `set` will be removed in Node 0.13+
+// `set` is deprecated
 Buffer.prototype.set = function set (v, offset) {
   console.log('.set() is deprecated. Access using array indexes instead.')
   return this.writeUInt8(v, offset)
@@ -1232,7 +1249,7 @@ Buffer._augment = function _augment (arr) {
   // save reference to original Uint8Array set method before overwriting
   arr._set = arr.set
 
-  // deprecated, will be removed in node 0.13+
+  // deprecated
   arr.get = BP.get
   arr.set = BP.set