gin/array_buffer.h

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GIN_ARRAY_BUFFER_H_
   6 #define GIN_ARRAY_BUFFER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "gin/converter.h"
  12 #include "v8/include/v8.h"
  13
  14 namespace gin {
  15
  16 class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
  17  public:
  18   virtual void* Allocate(size_t length) OVERRIDE;
  19   virtual void* AllocateUninitialized(size_t length) OVERRIDE;
  20   virtual void Free(void* data, size_t length) OVERRIDE;
  21
  22   static ArrayBufferAllocator* SharedInstance();
  23 };
  24
  25 class ArrayBuffer {
  26  public:
  27   ArrayBuffer();
  28   explicit ArrayBuffer(v8::Isolate* isolate);
  29   ArrayBuffer(v8::Isolate* isolate, v8::Handle<v8::ArrayBuffer> buffer);
  30   ~ArrayBuffer();
  31
  32   void* bytes() const { return bytes_; }
  33   size_t num_bytes() const { return num_bytes_; }
  34
  35  private:
  36   class Private;
  37
  38   scoped_refptr<Private> private_;
  39   void* bytes_;
  40   size_t num_bytes_;
  41
  42   DISALLOW_COPY(ArrayBuffer);
  43 };
  44
  45 template<>
  46 struct Converter<ArrayBuffer> {
  47   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
  48                      ArrayBuffer* out);
  49 };
  50
  51 class ArrayBufferView {
  52  public:
  53   ArrayBufferView();
  54   ArrayBufferView(v8::Isolate* isolate, v8::Handle<v8::ArrayBufferView> view);
  55   ~ArrayBufferView();
  56
  57   void* bytes() const {
  58     return static_cast<uint8_t*>(array_buffer_.bytes()) + offset_;
  59   }
  60   size_t num_bytes() const { return num_bytes_; }
  61
  62  private:
  63   ArrayBuffer array_buffer_;
  64   size_t offset_;
  65   size_t num_bytes_;
  66
  67   DISALLOW_COPY(ArrayBufferView);
  68 };
  69
  70 template<>
  71 struct Converter<ArrayBufferView> {
  72   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
  73                      ArrayBufferView* out);
  74 };
  75
  76 }  // namespace gin
  77
  78 #endif  // GIN_ARRAY_BUFFER_H_