Port Mojo's sample_service.cc to JavaScript

mojo/public/bindings/js/codec.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 define(function() {
 
   // Memory -------------------------------------------------------------------
 
   function store8(memory, pointer, val) {
     memory[pointer] = val;
@@ skipping 32 matching lines @@
            (memory[pointer + 2] << 16) +
            (memory[pointer + 3] << 24);
   }
 
   function load64(memory, pointer) {
     var low = load32(memory, pointer);
     var high = load32(memory, pointer + 4);
     return low + high * 0x10000;
   }
 
+  var kAlignment = 8;
+
+  function align(size) {
+    return size + (kAlignment - (size % kAlignment)) % kAlignment;

[abarth-chromium, 2013/11/18 23:30:44]

The last % kAlignment is needed to handle the size == 8 case.

+  }
+
   // Buffer -------------------------------------------------------------------
 
   function Buffer(size) {
     this.memory = new Uint8Array(size);
     this.next = 0;
   }
 
   Buffer.prototype.alloc = function(size) {
     var pointer = this.next;
     this.next += size;
@@ skipping 321 matching lines @@
 
   Handle.decode = function(decoder) {
     return decoder.decodeHandle();
   };
 
   Handle.encode = function(encoder, val) {
     encoder.encodeHandle(val);
   };
 
   var exports = {};
-  exports.load32 = load32;

[abarth-chromium, 2013/11/18 23:30:44]

We don't need to export load32 anymore.  We used to export that for some
low-level tests that are now subsumed by higher level testing.

+  exports.align = align;
   exports.MessageBuilder = MessageBuilder;
   exports.MessageReader = MessageReader;
   exports.kArrayHeaderSize = kArrayHeaderSize;
   exports.kStructHeaderSize = kStructHeaderSize;
   exports.kMessageHeaderSize = kMessageHeaderSize;
   exports.Uint8 = Uint8;
   exports.Uint16 = Uint16;
   exports.Uint32 = Uint32;
   exports.Uint64 = Uint64;
   exports.PointerTo = PointerTo;
   exports.Handle = Handle;
   return exports;
 });