buffer: remove Buffer#toArrayBuffer()

A recent change to v8's API now makes it impossible to memcpy to a
v8::ArrayBuffer without causing it to be externalized. This means that
the garbage collector will not automatically free the memory when the
object is collected.

When/If the necessary API is included to allow the above
Buffer#toArrayBuffer() will be reintroduced.

Signed-off-by: Timothy J Fontaine <tjfontaine@gmail.com>

doc/api/buffer.markdown

@@ -698,10 +698,6 @@ buffer.
     var b = new Buffer(50);
     b.fill("h");
 
-### buf.toArrayBuffer()
-
-Creates a new `ArrayBuffer` with the copied memory of the buffer instance.
-
 ## buffer.INSPECT_MAX_BYTES
 
 * Number, Default: 50

src/node_buffer.cc

@@ -572,26 +572,6 @@ void WriteDoubleBE(const FunctionCallbackInfo<Value>& args) {
 }
 
 
-void ToArrayBuffer(const FunctionCallbackInfo<Value>& args) {
-  Environment* env = Environment::GetCurrent(args.GetIsolate());
-  HandleScope scope(env->isolate());
-
-  ARGS_THIS(args.This());
-  void* adata = malloc(obj_length);
-
-  if (adata == NULL) {
-    FatalError("node::Buffer::ToArrayBuffer("
-        "const FunctionCallbackInfo<v8::Value>&)",
-        "Out Of Memory");
-  }
-
-  memcpy(adata, obj_data, obj_length);
-
-  Local<ArrayBuffer> abuf = ArrayBuffer::New(env->isolate(), adata, obj_length);
-  args.GetReturnValue().Set(abuf);
-}
-
-
 void ByteLength(const FunctionCallbackInfo<Value> &args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   HandleScope scope(env->isolate());
@@ -679,8 +659,6 @@ void SetupBufferJS(const FunctionCallbackInfo<Value>& args) {
   NODE_SET_METHOD(proto, "writeFloatBE", WriteFloatBE);
   NODE_SET_METHOD(proto, "writeFloatLE", WriteFloatLE);
 
-  NODE_SET_METHOD(proto, "toArrayBuffer", ToArrayBuffer);
-
   NODE_SET_METHOD(proto, "copy", Copy);
   NODE_SET_METHOD(proto, "fill", Fill);
 

test/simple/test-buffer.js

@@ -1006,18 +1006,6 @@ assert.throws(function() {
   }
 })();
 
-// Test Buffers to ArrayBuffers
-var b = new Buffer(5).fill('abcdf');
-var c = b.toArrayBuffer();
-assert.equal(c.byteLength, 5);
-assert.equal(Object.prototype.toString.call(c), '[object ArrayBuffer]');
-var d = new Uint8Array(c);
-for (var i = 0; i < 5; i++)
-  assert.equal(d[i], b[i]);
-b.fill('ghijk');
-for (var i = 0; i < 5; i++)
-  assert.notEqual(d[i], b[i]);
-
 
 assert.throws(function () {
   new Buffer(smalloc.kMaxLength + 1);