From b0c06bccb4254221053bd2ce8a3270ffcfb58100 Mon Sep 17 00:00:00 2001
From: Jan Deinhard <jan.deinhard@sennheiser-connect.com>
Date: Fri, 23 Oct 2015 12:54:12 +0200
Subject: [PATCH] Make node-i2c compile with Node 4.

* v8::Buffer::New returns an instance of v8::MaybeLocal<>
* an instance of v8::MaybeLocal<v8::Object> needs to be asked for the actual local
  by calling v8::MaybeLocal<v8::Object>::ToLocalChecked()
---
 src/i2c.cc | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/i2c.cc b/src/i2c.cc
index c0b00fb..4dbdcd9 100644
--- a/src/i2c.cc
+++ b/src/i2c.cc
@@ -159,19 +159,19 @@ void ReadBlock(const FunctionCallbackInfo<Value>& args) {
   int32_t len = args[1]->Int32Value();
   uint8_t data[len]; 
   Local<Value> err = Local<Value>::New(isolate, Null(isolate));
-  Local<Object> buffer = node::Buffer::New(len);
+  MaybeLocal<Object> buffer = node::Buffer::New(isolate, len);
 
   while (fd > 0) {
     if (i2c_smbus_read_i2c_block_data(fd, cmd, len, data) != len) {
       err = Exception::Error(String::NewFromUtf8(isolate, "Error reading length of bytes"));
     }
 
-    memcpy(node::Buffer::Data(buffer), data, len);
+    memcpy(node::Buffer::Data(buffer.ToLocalChecked()), data, len);
 
     if (args[3]->IsFunction()) {
       const unsigned argc = 2;
       Local<Function> callback = Local<Function>::Cast(args[3]);
-      Local<Value> argv[argc] = { err, buffer };
+      Local<Value> argv[argc] = { err, buffer.ToLocalChecked() };
       callback->Call(isolate->GetCurrentContext()->Global(), argc, argv);
     }
  
@@ -183,7 +183,7 @@ void ReadBlock(const FunctionCallbackInfo<Value>& args) {
     }
   }
 
-  args.GetReturnValue().Set(buffer);
+  args.GetReturnValue().Set(buffer.ToLocalChecked());
 }
 
 void Write(const FunctionCallbackInfo<Value>& args) {
@@ -290,4 +290,4 @@ void Init(Handle<Object> exports) {
   NODE_SET_METHOD(exports, "readBlock", ReadBlock);
 }
 
-NODE_MODULE(i2c, Init)
\ No newline at end of file
+NODE_MODULE(i2c, Init)