From e981fb0475be02cadf27f52ba2c498ac536deeb1 Mon Sep 17 00:00:00 2001
From: Matthew Leon <ml@matthewleon.com>
Date: Thu, 7 Dec 2017 22:22:19 -0500
Subject: [PATCH] Buffer.fromArrayBuffer

No tests, as there is no standard module for ArrayBuffer operations.
---
 src/Node/Buffer.js   | 6 ++++++
 src/Node/Buffer.purs | 6 ++++++
 2 files changed, 12 insertions(+)

diff --git a/src/Node/Buffer.js b/src/Node/Buffer.js
index 52a3126..5da0967 100644
--- a/src/Node/Buffer.js
+++ b/src/Node/Buffer.js
@@ -25,6 +25,12 @@ exports.fromStringImpl = function (str) {
   };
 };
 
+exports.fromArrayBuffer = function(ab) {
+  return function() {
+    return Buffer.from(ab);
+  };
+};
+
 exports.toArrayBuffer = function(buff) {
   return function() {
     return buff.buffer.slice(buff.byteOffset, buff.byteOffset + buff.byteLength);
diff --git a/src/Node/Buffer.purs b/src/Node/Buffer.purs
index 7709e16..b6631dc 100644
--- a/src/Node/Buffer.purs
+++ b/src/Node/Buffer.purs
@@ -7,6 +7,7 @@ module Node.Buffer
   , create
   , fromArray
   , fromString
+  , fromArrayBuffer
   , toArrayBuffer
   , read
   , readString
@@ -87,6 +88,11 @@ foreign import create :: forall e. Int -> Eff (buffer :: BUFFER | e) Buffer
 -- | Creates a new buffer from an array of octets, sized to match the array.
 foreign import fromArray :: forall e. Array Octet -> Eff (buffer :: BUFFER | e) Buffer
 
+-- | Creates a buffer view from a JS ArrayByffer without copying data.
+--
+-- Requires Node >= v5.10.0
+foreign import fromArrayBuffer :: forall e. ArrayBuffer -> Eff (buffer :: BUFFER | e) Buffer
+
 -- | Creates a new buffer from a string with the specified encoding, sized to
 -- | match the string.
 fromString :: forall e. String -> Encoding -> Eff (buffer :: BUFFER | e) Buffer