// Copyright (C) 2022 Check Point Software Technologies Ltd. All rights reserved.

// Licensed under the Apache License, Version 2.0 (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.

#ifndef __BUFFER_CHAR_ITERATOR_H__
#define __BUFFER_CHAR_ITERATOR_H__

#include <iterator>

class Buffer::CharIterator
{
public:
    using value_type = u_char;

    CharIterator() {}
    void operator++();
    void operator++(int) { ++(*this); }
    void operator+=(uint);
    CharIterator operator+(uint) const;
    bool operator==(const CharIterator &other) const;
    bool operator!=(const CharIterator &other) const { return !((*this)==other); }
    const u_char & operator*() const;

private:
    friend class Buffer;
    CharIterator(const SegIterator &_cur, const SegIterator &_end, uint _offset);
    CharIterator(const SegIterator &_end);
    SegIterator cur_seg, end_seg;
    const u_char *ptr = nullptr;
    uint offset = 0, size = 0;
};

namespace std
{

template <>
struct iterator_traits<Buffer::CharIterator>
{
    using value_type = u_char;
};

}; // namespace std

#endif // __BUFFER_CHAR_ITERATOR_H__
