Diff: fnv_1.h

Revision:

0:b47c2a7920c2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fnv_1.h	Fri Mar 16 16:34:18 2018 +0000
@@ -0,0 +1,286 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+https://github.com/ETLCPP/etl
+http://www.etlcpp.com
+
+Copyright(c) 2014 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef __ETL_FNV_1__
+#define __ETL_FNV_1__
+
+#include <stdint.h>
+
+#include "platform.h"
+#include "static_assert.h"
+#include "type_traits.h"
+#include "ihash.h"
+#include "frame_check_sequence.h"
+
+
+#if defined(ETL_COMPILER_KEIL)
+#pragma diag_suppress 1300 
+#endif
+
+///\defgroup fnv_1 FNV-1 & FNV-1a 32 & 64 bit hash calculations
+///\ingroup maths
+
+namespace etl
+{
+  //***************************************************************************
+  /// fnv_1 policy.
+  /// Calculates FNV1.
+  //***************************************************************************
+  struct fnv_1_policy_64
+  {
+    typedef uint64_t value_type;
+
+    inline uint64_t initial() const
+    {
+      return OFFSET_BASIS;
+    }
+
+    inline uint64_t add(uint64_t hash, uint8_t value) const
+    {
+      hash *= PRIME;
+      hash ^= value;
+      return  hash;
+    }
+
+    inline uint64_t final(uint64_t hash) const
+    {
+      return hash;
+    }
+
+    static const uint64_t OFFSET_BASIS = 0xCBF29CE484222325;
+    static const uint64_t PRIME        = 0x00000100000001b3;
+  };
+  
+  //***************************************************************************
+  /// Calculates the fnv_1_64 hash.
+  ///\ingroup fnv_1_64
+  //***************************************************************************
+  class fnv_1_64 : public etl::frame_check_sequence<fnv_1_policy_64>
+  {
+  public:
+
+    //*************************************************************************
+    /// Default constructor.
+    //*************************************************************************
+    fnv_1_64()
+    {
+      this->reset();
+    }
+
+    //*************************************************************************
+    /// Constructor from range.
+    /// \param begin Start of the range.
+    /// \param end   End of the range.
+    //*************************************************************************
+    template<typename TIterator>
+    fnv_1_64(TIterator begin, const TIterator end)
+    {
+      this->reset();
+      this->add(begin, end);
+    }
+  };
+
+  //***************************************************************************
+  /// fnv_1a policy.
+  /// Calculates FNV1A.
+  //***************************************************************************
+  struct fnv_1a_policy_64
+    {
+    typedef uint64_t value_type;
+
+    inline uint64_t initial() const
+      {
+      return OFFSET_BASIS;
+    }
+
+    inline uint64_t add(uint64_t hash, uint8_t value) const
+    {
+      hash ^= value;
+      hash *= PRIME;
+      return hash;
+    }
+
+    inline uint64_t final(uint64_t hash) const
+    {
+      return hash;
+    }
+
+    static const uint64_t OFFSET_BASIS = 0xCBF29CE484222325;
+    static const uint64_t PRIME        = 0x00000100000001b3;
+  };
+
+  //***************************************************************************
+  /// Calculates the fnv_1a_64 hash.
+  ///\ingroup fnv_1a_64
+  //***************************************************************************
+  class fnv_1a_64 : public etl::frame_check_sequence<fnv_1a_policy_64>
+  {
+  public:
+
+    //*************************************************************************
+    /// Default constructor.
+    //*************************************************************************
+    fnv_1a_64()
+    {
+      this->reset();
+    }
+
+    //*************************************************************************
+    /// Constructor from range.
+    /// \param begin Start of the range.
+    /// \param end   End of the range.
+    //*************************************************************************
+    template<typename TIterator>
+    fnv_1a_64(TIterator begin, const TIterator end)
+    {
+      this->reset();
+      this->add(begin, end);
+    }
+  };
+
+  //***************************************************************************
+  /// fnv_1 policy.
+  /// Calculates FNV1.
+  //***************************************************************************
+  struct fnv_1_policy_32
+    {
+    typedef uint32_t value_type;
+      
+    inline uint32_t initial() const
+      {
+      return OFFSET_BASIS;
+    }
+
+    inline uint32_t add(uint32_t hash, uint8_t value) const
+    {
+      hash *= PRIME;
+      hash ^= value;
+      return hash;
+    }
+
+    inline uint32_t final(uint32_t hash) const
+    {
+      return hash;
+    }
+
+    static const uint32_t OFFSET_BASIS = 0x811C9DC5;
+    static const uint32_t PRIME        = 0x01000193;
+  };
+
+  //***************************************************************************
+  /// Calculates the fnv_1_32 hash.
+  ///\ingroup fnv_1_32
+  //***************************************************************************
+  class fnv_1_32 : public etl::frame_check_sequence<fnv_1_policy_32>
+  {
+  public:
+
+    //*************************************************************************
+    /// Default constructor.
+    //*************************************************************************
+    fnv_1_32()
+    {
+      this->reset();
+    }
+
+    //*************************************************************************
+    /// Constructor from range.
+    /// \param begin Start of the range.
+    /// \param end   End of the range.
+    //*************************************************************************
+    template<typename TIterator>
+    fnv_1_32(TIterator begin, const TIterator end)
+    {
+      this->reset();
+      this->add(begin, end);
+    }
+  };
+
+  //***************************************************************************
+  /// fnv_1a policy.
+  /// Calculates FNV1A.
+  //***************************************************************************
+  struct fnv_1a_policy_32
+    {
+    typedef uint32_t value_type;
+
+    inline uint32_t initial() const
+      {
+      return OFFSET_BASIS;
+    }
+
+    inline uint32_t add(uint32_t hash, uint8_t value) const
+    {
+      hash ^= value;
+      hash *= PRIME;
+      return hash;
+    }
+
+    inline uint32_t final(uint32_t hash) const
+    {
+      return hash;
+    }
+
+    static const uint32_t OFFSET_BASIS = 0x811C9DC5;
+    static const uint32_t PRIME        = 0x01000193;
+  };
+
+  //***************************************************************************
+  /// Calculates the fnv_1a_32 hash.
+  ///\ingroup fnv_1a_32
+  //***************************************************************************
+  class fnv_1a_32 : public etl::frame_check_sequence<fnv_1a_policy_32>
+  {
+  public:
+
+    //*************************************************************************
+    /// Default constructor.
+    //*************************************************************************
+    fnv_1a_32()
+    {
+      this->reset();
+    }
+
+    //*************************************************************************
+    /// Constructor from range.
+    /// \param begin Start of the range.
+    /// \param end   End of the range.
+    //*************************************************************************
+    template<typename TIterator>
+    fnv_1a_32(TIterator begin, const TIterator end)
+    {
+      this->reset();
+      this->add(begin, end);
+    }
+  };
+}
+
+#endif
+