Tizen 2.0 Releasesubmit/tizen_2.0/20130215.192206accepted/tizen_2.0/20130215.202315tizen_2.0

1 files changed, 119 insertions, 0 deletions

diff --git a/base/memory/ref_counted_memory.h b/base/memory/ref_counted_memory.h
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+++ b/base/memory/ref_counted_memory.h
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+// 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 BASE_MEMORY_REF_COUNTED_MEMORY_H_
+#define BASE_MEMORY_REF_COUNTED_MEMORY_H_
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "base/base_export.h"
+#include "base/compiler_specific.h"
+#include "base/memory/ref_counted.h"
+
+// TODO(erg): The contents of this file should be in a namespace. This would
+// require touching >100 files in chrome/ though.
+
+// A generic interface to memory. This object is reference counted because one
+// of its two subclasses own the data they carry, and we need to have
+// heterogeneous containers of these two types of memory.
+class BASE_EXPORT RefCountedMemory
+    : public base::RefCountedThreadSafe<RefCountedMemory> {
+ public:
+  // Retrieves a pointer to the beginning of the data we point to. If the data
+  // is empty, this will return NULL.
+  virtual const unsigned char* front() const = 0;
+
+  // Size of the memory pointed to.
+  virtual size_t size() const = 0;
+
+ protected:
+  friend class base::RefCountedThreadSafe<RefCountedMemory>;
+  RefCountedMemory();
+  virtual ~RefCountedMemory();
+};
+
+// An implementation of RefCountedMemory, where the ref counting does not
+// matter.
+class BASE_EXPORT RefCountedStaticMemory : public RefCountedMemory {
+ public:
+  RefCountedStaticMemory()
+      : data_(NULL), length_(0) {}
+  RefCountedStaticMemory(const unsigned char* data, size_t length)
+      : data_(length ? data : NULL), length_(length) {}
+
+  // Overridden from RefCountedMemory:
+  virtual const unsigned char* front() const OVERRIDE;
+  virtual size_t size() const OVERRIDE;
+
+ private:
+  const unsigned char* data_;
+  size_t length_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedStaticMemory);
+};
+
+// An implementation of RefCountedMemory, where we own our the data in a
+// vector.
+class BASE_EXPORT RefCountedBytes : public RefCountedMemory {
+ public:
+  RefCountedBytes();
+
+  // Constructs a RefCountedBytes object by _copying_ from |initializer|.
+  RefCountedBytes(const std::vector<unsigned char>& initializer);
+
+  // Constructs a RefCountedBytes object by performing a swap. (To non
+  // destructively build a RefCountedBytes, use the constructor that takes a
+  // vector.)
+  static RefCountedBytes* TakeVector(std::vector<unsigned char>* to_destroy);
+
+  // Overridden from RefCountedMemory:
+  virtual const unsigned char* front() const OVERRIDE;
+  virtual size_t size() const OVERRIDE;
+
+  const std::vector<unsigned char>& data() const { return data_; }
+  std::vector<unsigned char>& data() { return data_; }
+
+ private:
+  friend class base::RefCountedThreadSafe<RefCountedBytes>;
+  virtual ~RefCountedBytes();
+
+  std::vector<unsigned char> data_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedBytes);
+};
+
+namespace base {
+
+// An implementation of RefCountedMemory, where the bytes are stored in an STL
+// string. Use this if your data naturally arrives in that format.
+class BASE_EXPORT RefCountedString : public RefCountedMemory {
+ public:
+  RefCountedString();
+
+  // Constructs a RefCountedString object by performing a swap. (To non
+  // destructively build a RefCountedString, use the default constructor and
+  // copy into object->data()).
+  static RefCountedString* TakeString(std::string* to_destroy);
+
+  // Overridden from RefCountedMemory:
+  virtual const unsigned char* front() const OVERRIDE;
+  virtual size_t size() const OVERRIDE;
+
+  const std::string& data() const { return data_; }
+  std::string& data() { return data_; }
+
+ private:
+  friend class base::RefCountedThreadSafe<RefCountedString>;
+  virtual ~RefCountedString();
+
+  std::string data_;
+
+  DISALLOW_COPY_AND_ASSIGN(RefCountedString);
+};
+
+}  // namespace base
+
+#endif  // BASE_MEMORY_REF_COUNTED_MEMORY_H_