include/tscore/Hash.h

/** @file

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
 */

#pragma once

#include <cstddef>
#include <cstdint>
#include <cctype>

struct ATSHashBase {
  virtual void update(const void *, size_t) = 0;
  virtual void final()                      = 0;
  virtual void clear()                      = 0;
  virtual ~ATSHashBase();
};

struct ATSHash : ATSHashBase {
  struct nullxfrm {
    uint8_t
    operator()(uint8_t byte) const
    {
      return byte;
    }
  };

  struct nocase {
    uint8_t
    operator()(uint8_t byte) const
    {
      return toupper(byte);
    }
  };

  virtual const void *get() const  = 0;
  virtual size_t      size() const = 0;
  virtual bool        operator==(const ATSHash &) const;
};

struct ATSHash32 : ATSHashBase {
  virtual uint32_t get() const = 0;
  virtual bool     operator==(const ATSHash32 &) const;
};

struct ATSHash64 : ATSHashBase {
  virtual uint64_t get() const = 0;
  virtual bool     operator==(const ATSHash64 &) const;
};