// Copyright (c) 2005-2023 Jay Berkenbilt
//
// This file is part of qpdf.
//
// Licensed 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.
//
// Versions of qpdf prior to version 7 were released under the terms
// of version 2.0 of the Artistic License. At your option, you may
// continue to consider qpdf to be licensed under those terms. Please
// see the manual for additional information.

#ifndef BUFFER_HH
#define BUFFER_HH

#include <qpdf/DLL.h>
#include <qpdf/PointerHolder.hh> // unused -- remove in qpdf 12 (see #785)

#include <memory>
#include <stddef.h>

class Buffer
{
  public:
    QPDF_DLL
    Buffer();

    // Create a Buffer object whose memory is owned by the class and
    // will be freed when the Buffer object is destroyed.
    QPDF_DLL
    Buffer(size_t size);

    // Create a Buffer object whose memory is owned by the caller and
    // will not be freed when the Buffer is destroyed.
    QPDF_DLL
    Buffer(unsigned char* buf, size_t size);

    QPDF_DLL
    Buffer(Buffer const&);
    QPDF_DLL
    Buffer& operator=(Buffer const&);
    QPDF_DLL
    Buffer(Buffer&&) noexcept;
    QPDF_DLL
    Buffer& operator=(Buffer&&) noexcept;
    QPDF_DLL
    size_t getSize() const;
    QPDF_DLL
    unsigned char const* getBuffer() const;
    QPDF_DLL
    unsigned char* getBuffer();

  private:
    class Members
    {
        friend class Buffer;

      public:
        QPDF_DLL
        ~Members();

      private:
        Members(size_t size, unsigned char* buf, bool own_memory);
        Members(Members const&) = delete;

        bool own_memory;
        size_t size;
        unsigned char* buf;
    };

    void copy(Buffer const&);

    std::unique_ptr<Members> m;
};

#endif // BUFFER_HH
