Implement in-process PPB_VarArrayBuffer_Dev.

ppapi/shared_impl/var.h

 // Copyright (c) 2011 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.
 
 #ifndef PPAPI_SHARED_IMPL_VAR_H_
 #define PPAPI_SHARED_IMPL_VAR_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
 
 namespace ppapi {
 
+class ArrayBufferVar;
 class NPObjectVar;
 class ProxyObjectVar;
 class StringVar;
 
 // Var -------------------------------------------------------------------------
 
 // Represents a non-POD var.
 class PPAPI_SHARED_EXPORT Var : public base::RefCounted<Var> {
  public:
   virtual ~Var();
 
   // Returns a string representing the given var for logging purposes.
   static std::string PPVarToLogString(PP_Var var);
 
   virtual StringVar* AsStringVar();
+  virtual ArrayBufferVar* AsArrayBufferVar();
   virtual NPObjectVar* AsNPObjectVar();
   virtual ProxyObjectVar* AsProxyObjectVar();
 
   // Creates a PP_Var corresponding to this object. The return value will have
   // one reference addrefed on behalf of the caller.
-  virtual PP_Var GetPPVar() = 0;
+  PP_Var GetPPVar();
 
   // Returns the type of this var.
   virtual PP_VarType GetType() const = 0;
 
   // Returns the ID corresponing to the string or object if it exists already,
   // or 0 if an ID hasn't been generated for this object (the plugin is holding
   // no refs).
   //
   // Contrast to GetOrCreateVarID which creates the ID and a ref on behalf of
   // the plugin.
@@ skipping 36 matching lines @@
 class PPAPI_SHARED_EXPORT StringVar : public Var {
  public:
   StringVar(const std::string& str);
   StringVar(const char* str, uint32 len);
   virtual ~StringVar();
 
   const std::string& value() const { return value_; }
 
   // Var override.
   virtual StringVar* AsStringVar() OVERRIDE;
-  virtual PP_Var GetPPVar() OVERRIDE;
   virtual PP_VarType GetType() const OVERRIDE;
 
   // Helper function to create a PP_Var of type string that contains a copy of
   // the given string. The input data must be valid UTF-8 encoded text, if it
   // is not valid UTF-8, a NULL var will be returned.
   //
   // The return value will have a reference count of 1. Internally, this will
   // create a StringVar and return the reference to it in the var.
   static PP_Var StringToPPVar(const std::string& str);
   static PP_Var StringToPPVar(const char* str, uint32 len);
 
   // Helper function that converts a PP_Var to a string. This will return NULL
   // if the PP_Var is not of string type or the string is invalid.
   static StringVar* FromPPVar(PP_Var var);
 
  private:
   std::string value_;
 
   DISALLOW_COPY_AND_ASSIGN(StringVar);
 };
 
+// ArrayBufferVar --------------------------------------------------------------
+
+// Represents an array buffer Var.
+//
+// Note this is an abstract class. To create an appropriate concrete one, you
+// need to use the VarTracker:
+//   VarArrayBuffer* buf =
+//       PpapiGlobals::Get()->GetVarTracker()->CreateArrayBuffer(size);
+//
+// Converting a PP_Var to an ArrayBufferVar:
+//   ArrayBufferVar* array = ArrayBufferVar::FromPPVar(var);
+//   if (!array)
+//     return false;  // Not an ArrayBuffer or an invalid var.
+//   DoSomethingWithTheBuffer(array);
+class PPAPI_SHARED_EXPORT ArrayBufferVar : public Var {
+ public:
+  ArrayBufferVar();
+  virtual ~ArrayBufferVar();
+
+  virtual void* Map() = 0;
+  virtual uint32 ByteLength() = 0;
+
+  // Var override.
+  virtual ArrayBufferVar* AsArrayBufferVar() OVERRIDE;
+  virtual PP_VarType GetType() const OVERRIDE;
+
+  // Helper function that converts a PP_Var to an ArrayBufferVar. This will
+  // return NULL if the PP_Var is not of ArrayBuffer type.
+  static ArrayBufferVar* FromPPVar(PP_Var var);
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ArrayBufferVar);
+};
+
 }  // namespace ppapi
 
 #endif  // PPAPI_SHARED_IMPL_VAR_H_