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 "gin/gin_export.h"
  13 #include "v8/include/v8.h"
  14
  15 namespace gin {
  16
  17 class ArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
  18  public:
  19   virtual void* Allocate(size_t length) OVERRIDE;
  20   virtual void* AllocateUninitialized(size_t length) OVERRIDE;
  21   virtual void Free(void* data, size_t length) OVERRIDE;
  22
  23   static ArrayBufferAllocator* SharedInstance();
  24 };
  25
  26 class GIN_EXPORT ArrayBuffer {
  27  public:
  28   ArrayBuffer();
  29   explicit ArrayBuffer(v8::Isolate* isolate);
  30   ArrayBuffer(v8::Isolate* isolate, v8::Handle<v8::ArrayBuffer> buffer);
  31   ~ArrayBuffer();
  32   ArrayBuffer& operator=(const ArrayBuffer& other);
  33
  34   void* bytes() const { return bytes_; }
  35   size_t num_bytes() const { return num_bytes_; }
  36
  37  private:
  38   class Private;
  39
  40   scoped_refptr<Private> private_;
  41   void* bytes_;
  42   size_t num_bytes_;
  43
  44   DISALLOW_COPY(ArrayBuffer);
  45 };
  46
  47 template<>
  48 struct GIN_EXPORT Converter<ArrayBuffer> {
  49   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
  50                      ArrayBuffer* out);
  51 };
  52
  53 class GIN_EXPORT ArrayBufferView {
  54  public:
  55   ArrayBufferView();
  56   ArrayBufferView(v8::Isolate* isolate, v8::Handle<v8::ArrayBufferView> view);
  57   ~ArrayBufferView();
  58
  59   void* bytes() const {
  60     return static_cast<uint8_t*>(array_buffer_.bytes()) + offset_;
  61   }
  62   size_t num_bytes() const { return num_bytes_; }
  63
  64  private:
  65   ArrayBuffer array_buffer_;
  66   size_t offset_;
  67   size_t num_bytes_;
  68
  69   DISALLOW_COPY(ArrayBufferView);
  70 };
  71
  72 template<>
  73 struct GIN_EXPORT Converter<ArrayBufferView> {
  74   static bool FromV8(v8::Isolate* isolate, v8::Handle<v8::Value> val,
  75                      ArrayBufferView* out);
  76 };
  77
  78 }  // namespace gin
  79
  80 #endif  // GIN_ARRAY_BUFFER_H_