3 files changed, 77 insertions, 2 deletions
diff --git a/base/base.gyp b/base/base.gyp
index c423484..2ca5cfb 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -238,6 +238,7 @@
         'rand_util_win.cc',
         'ref_counted.cc',
         'ref_counted.h',
+        'ref_counted_memory.h',
         'registry.cc',
         'registry.h',
         'resource_util.cc',
diff --git a/base/ref_counted.h b/base/ref_counted.h
index 70536b9..e04bb7c 100644
--- a/base/ref_counted.h
+++ b/base/ref_counted.h
@@ -62,8 +62,6 @@ class RefCountedThreadSafeBase {
   DISALLOW_COPY_AND_ASSIGN(RefCountedThreadSafeBase);
 };
 
-
-
 }  // namespace subtle
 
 //
diff --git a/base/ref_counted_memory.h b/base/ref_counted_memory.h
new file mode 100644
index 0000000..ef05abd
--- /dev/null
+++ b/base/ref_counted_memory.h
@@ -0,0 +1,76 @@
+// Copyright (c) 2009 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_REF_COUNTED_MEMORY_H_
+#define BASE_REF_COUNTED_MEMORY_H_
+
+#include <vector>
+
+#include "base/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 RefCountedMemory : public base::RefCountedThreadSafe< RefCountedMemory > {
+ public:
+  virtual ~RefCountedMemory() {}
+
+  // Retrieves a pointer to the beginning of the data we point to.
+  virtual const unsigned char* front() const = 0;
+
+  // Size of the memory pointed to.
+  virtual size_t size() const = 0;
+};
+
+// An implementation of RefCountedMemory, where the ref counting does not
+// matter.
+class RefCountedStaticMemory : public RefCountedMemory {
+ public:
+  RefCountedStaticMemory()
+      : data_(NULL), length_(0) {}
+  RefCountedStaticMemory(const unsigned char* data, size_t length)
+      : data_(data), length_(length) {}
+
+  virtual const unsigned char* front() const { return data_; }
+  virtual size_t size() const { return length_; }
+
+ 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 RefCountedBytes : public RefCountedMemory {
+ public:
+  // 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) {
+    RefCountedBytes* bytes = new RefCountedBytes;
+    bytes->data.swap(*to_destroy);
+    return bytes;
+  }
+
+  RefCountedBytes() {}
+
+  // Constructs a RefCountedBytes object by _copying_ from |initializer|.
+  RefCountedBytes(const std::vector<unsigned char>& initializer)
+      : data(initializer) {}
+
+  virtual const unsigned char* front() const { return &data.front(); }
+  virtual size_t size() const { return data.size(); }
+
+  std::vector<unsigned char> data;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(RefCountedBytes);
+};
+
+#endif  // BASE_REF_COUNTED_MEMORY_H_