hash.h

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/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
/*
 * Copyright (c) 2012 Lawrence Livermore National Laboratory
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation;
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * Author: Peter D. Barnes, Jr. <pdbarnes@llnl.gov>
 */

#ifndef HASH_H
#define HASH_H

#include <string>

#include "assert.h"
#include "ptr.h"

#include "hash-function.h"
#include "hash-murmur3.h"
#include "hash-fnv.h"

namespace ns3 {

class Hasher
{
public:
  Hasher ();
  Hasher (Ptr<Hash::Implementation> hp);
  uint32_t  GetHash32  (const char * buffer, const size_t size);
  uint64_t  GetHash64  (const char * buffer, const size_t size);

  uint32_t  GetHash32  (const std::string s);
  uint64_t  GetHash64  (const std::string s);
  Hasher & clear (void);

private:
  Ptr<Hash::Implementation> m_impl;  
};  // Hasher


/*************************************************
 **  Global functions declarations
 ************************************************/

uint32_t Hash32 (const char * buffer, const size_t size);
uint64_t Hash64 (const char * buffer, const size_t size);

uint32_t Hash32 (const std::string s);
uint64_t Hash64 (const std::string s);

}  // namespace ns3


/*************************************************
 **  Inline implementations for rvo
 ************************************************/

namespace ns3 {

/*************************************************
 class Hasher implementation, inlined for rvo
*/

inline
uint32_t
Hasher::GetHash32  (const char * buffer, const size_t size)
{
  NS_ASSERT (m_impl != 0);
  return m_impl->GetHash32  (buffer, size);
}

inline
uint64_t
Hasher::GetHash64  (const char * buffer, const size_t size)
{
  NS_ASSERT (m_impl != 0);
  return m_impl->GetHash64  (buffer, size);
}

inline
uint32_t
Hasher::GetHash32  (const std::string s)
{
  NS_ASSERT (m_impl != 0);
  return m_impl->GetHash32  (s.c_str (), s.size ());
}

inline
uint64_t
Hasher::GetHash64  (const std::string s)
{
  NS_ASSERT (m_impl != 0);
  return m_impl->GetHash64  (s.c_str (), s.size ());
}


/*************************************************
  Global hash functions, inlined for rvo
*/

inline
uint32_t
Hash32 (const char * buffer, const size_t size)
{
  return Hasher ().GetHash32 (buffer, size);
}

inline
uint64_t
Hash64 (const char * buffer, const size_t size)
{
  return Hasher ().GetHash64 (buffer, size);
}

inline
uint32_t
Hash32 (const std::string s)
{
  return Hasher ().GetHash32 (s);
}

inline
uint64_t
Hash64 (const std::string s)
{
  return Hasher ().GetHash64 (s);
}


}  // namespace ns3

#endif /* HASH_H */