Refactor EnsureOpenSSLInit and openssl_util into base

net/base/openssl_util.h

-// Copyright (c) 2006-2008 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.
-
-#include <openssl/ssl.h>
-
-#include "base/lock.h"
-#include "base/scoped_vector.h"
-#include "base/singleton.h"
-
-namespace net {
-
-// A helper class that takes care of destroying OpenSSL objects when it goes out
-// of scope.
-template <typename T, void (*destructor)(T*)>
-class ScopedSSL {
- public:
-  explicit ScopedSSL(T* ptr_) : ptr_(ptr_) { }
-  ~ScopedSSL() { if (ptr_) (*destructor)(ptr_); }
-
-  T* get() const { return ptr_; }
-
- private:
-  T* ptr_;
-};
-
-// Singleton for initializing / cleaning up OpenSSL and holding a X509 store.
-// Access it via GetOpenSSLInitSingleton().
-class OpenSSLInitSingleton {
- public:
-  SSL_CTX* ssl_ctx() const { return ssl_ctx_.get(); }
-  X509_STORE* x509_store() const { return store_.get(); }
-
- private:
-  friend struct DefaultSingletonTraits<OpenSSLInitSingleton>;
-  OpenSSLInitSingleton();
-  ~OpenSSLInitSingleton();
-
-  static void LockingCallback(int mode, int n, const char* file, int line);
-  void OnLockingCallback(int mode, int n, const char* file, int line);
-
-  ScopedSSL<SSL_CTX, SSL_CTX_free> ssl_ctx_;
-  ScopedSSL<X509_STORE, X509_STORE_free> store_;
-  // These locks are used and managed by OpenSSL via LockingCallback().
-  ScopedVector<Lock> locks_;
-
-  DISALLOW_COPY_AND_ASSIGN(OpenSSLInitSingleton);
-};
-
-OpenSSLInitSingleton* GetOpenSSLInitSingleton();
-
-// Initialize OpenSSL if it isn't already initialized. This must be called
-// before any other OpenSSL functions (except GetOpenSSLInitSingleton above).
-// This function is thread-safe, and OpenSSL will only ever be initialized once.
-// OpenSSL will be properly shut down on program exit.
-void EnsureOpenSSLInit();
-
-}  // namespace net
-