buffered_location_reader.hxx

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/*
 * Copyright (C) 2024-2026 David C. Manuelda (StormBytePP)
 *
 * This file is part of StormByte-Buffer.
 *
 * StormByte-Buffer original source is dual-licensed:
 *
 * 1. GNU Lesser General Public License v3.0 (or later)
 *    You may redistribute and/or modify this file under the terms of the
 *    GNU Lesser General Public License as published by the Free Software
 *    Foundation, either version 3 of the License, or (at your option)
 *    any later version.
 *
 * 2. Commercial license
 *    Alternatively, this file may be used under the terms of a commercial
 *    license agreement with the copyright holder
 *    (David C. Manuelda <StormByte@gmail.com>).
 *
 * Both licenses apply only to original StormByte-Buffer source in this
 * repository. They do not cover other StormByte modules or any third-party
 * material shipped with this repository (including everything under
 * thirdparty/, and in particular the bundled StormByte-Logger tree and
 * the rest of the StormByte suite it vendors), which remains under its own
 * license.
 *
 * Neither license grants any patent rights. Any patent licenses required
 * to use this software or third-party components must be obtained separately
 * from the patent holders.
 *
 * StormByte-Buffer 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 Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * version 3 along with StormByte-Buffer. If not, see
 * <https://www.gnu.org/licenses/lgpl-3.0.html>.
 *
 * SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-StormByte-Commercial
 */
 
#pragma once
 
#include <StormByte/buffer/io/buffered_reader.hxx>
#include <StormByte/buffer/visibility.h>
#include <StormByte/safe_pointers.hxx>
#include <StormByte/string/string.hxx>
#include <StormByte/system/device.hxx>
 
#include <chrono>
#include <memory>
#include <utility>
 
namespace StormByte {
    namespace Buffer {
        namespace Backend {
            namespace IO {
                class BufferedLocationReader;
            }
        }
 
        namespace IO {
            class STORMBYTE_BUFFER_PUBLIC BufferedLocationReader: public BufferedReader {
                public:
                    class Parameters: public BufferedReader::Parameters {
                        public:
                            using BufferedReader::Parameters::Parameters;
                    };
 
                    BufferedLocationReader(const BufferedLocationReader&) = delete;
 
                    BufferedLocationReader(BufferedLocationReader&& other) noexcept;
 
                    virtual ~BufferedLocationReader() noexcept override;
 
                    BufferedLocationReader& operator=(const BufferedLocationReader&) = delete;
 
                    BufferedLocationReader& operator=(BufferedLocationReader&& other) noexcept;
 
                    StormByte::Shared<StormByte::System::Device> Device() const;
 
                protected:
                    STORMBYTE_FORCE_INLINE BufferedLocationReader(StormByte::String::String path,
                            enum Location location, Parameters parameters = {}):
                        BufferedLocationReader(std::move(path), location,
                            parameters.ReadAhead().value_or(StormByte::ByteSize{0}),
                            parameters.MaxMemory().value_or(StormByte::ByteSize{0}),
                            parameters.MaxWait().value_or(std::chrono::milliseconds{0}),
                            !parameters.ReadAhead().has_value()) {}
 
                    BufferedLocationReader(StormByte::String::String path, enum Location location,
                        StormByte::ByteSize read_ahead, StormByte::ByteSize max_memory,
                        std::chrono::milliseconds max_wait, bool probe);
 
                    virtual StormByte::Shared<StormByte::System::Device> OriginDevice() const = 0;
 
                    virtual bool OriginDeviceUsable(const StormByte::Shared<StormByte::System::Device>& device) const noexcept;
 
                    bool OriginCanSeek() const noexcept final;
 
                    bool OriginHasSize() const noexcept final;
 
                    void Setup() final;
 
                private:
                    std::unique_ptr<StormByte::Buffer::Backend::IO::BufferedLocationReader> m_io;   
            };
        }
    }
}