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/*
* Copyright 2009, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 THE COPYRIGHT
* OWNER 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.
*/
#ifndef PURITAN_RAND_H
#define PURITAN_RAND_H
// Use a strong RNG if available.
// TODO: Investigate using openssl on all platforms.
#ifdef _WIN32
#include <windows.h>
#include <wincrypt.h>
#else
typedef void* HCRYPTPROV;
#endif
namespace Salem
{
namespace Puritan
{
class Rand
{
public:
unsigned y;
unsigned rnd_uint(void) ;
Rand(unsigned seed);
double rnd_flt(void);
int range(int lo, int hi);
unsigned urange(unsigned lo, unsigned hi);
size_t srange(size_t lo, size_t hi);
const char *from_list (const char **);
private:
bool InitializeProvider();
HCRYPTPROV crypt_provider_;
static const size_t kCacheSize = 0x1000;
unsigned int cached_numbers_[kCacheSize];
long available_;
};
}
}
#endif
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