Move Source/WTF/wtf to Source/wtf

Source/WTF/wtf/RandomNumber.cpp

-/*
- * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
- *           (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
- * Copyright (C) 2013 Andrew Bortz. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
- */
-
-#include "config.h"
-#include "RandomNumber.h"
-
-#include "CryptographicallyRandomNumber.h"
-#include "RandomNumberSeed.h"
-
-#include <limits>
-#include <limits.h>
-#include <stdint.h>
-#include <stdlib.h>
-
-namespace WTF {
-
-#if !USE(OS_RANDOMNESS)
-namespace Internal {
-
-static uint64_t state;
-
-void initializeRandomNumber(uint64_t seed)
-{
-    state = seed;
-}
-
-// This random number generator comes from: Klimov, A. and Shamir, A.,
-// "A New Class of Invertible Mappings", Cryptographic Hardware and Embedded
-// Systems 2002, http://dl.acm.org/citation.cfm?id=752741
-//
-// Very fast, very simple, and passes Diehard and other good statistical
-// tests as strongly as cryptographically-secure random number generators (but
-// is not itself cryptographically-secure).
-uint32_t randomNumber()
-{
-    state += (state * state) | 5;
-    return static_cast<uint32_t>(state >> 32);
-}
-
-}
-#endif
-
-double randomNumber()
-{
-#if USE(OS_RANDOMNESS)
-    uint32_t bits = cryptographicallyRandomNumber();
-#else
-    uint32_t bits = Internal::randomNumber();
-#endif
-    return static_cast<double>(bits) / (static_cast<double>(std::numeric_limits<uint32_t>::max()) + 1.0);
-}
-
-}