mirror of
https://github.com/wiiu-env/ftpiiu_plugin.git
synced 2024-06-01 18:08:49 +02:00
89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// ftpd is a server implementation based on the following:
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// - RFC 959 (https://tools.ietf.org/html/rfc959)
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// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
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// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
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//
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// Copyright (C) 2020 Michael Theall
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <https://www.gnu.org/licenses/>.
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#pragma once
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#include <cstddef>
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#include <memory>
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/// \brief I/O buffer
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/// [unusable][usedArea][freeArea]
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class IOBuffer
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{
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public:
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~IOBuffer ();
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/// \brief Parameterized constructor
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/// \param size_ Buffer size
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IOBuffer (std::size_t size_);
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/// \brief Get pointer to writable area
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char *freeArea () const;
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/// \brief Get size of writable area
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std::size_t freeSize () const;
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/// \brief Get pointer to readable area
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char *usedArea () const;
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/// \brief Get size of readable area
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std::size_t usedSize () const;
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/// \brief Consume data from the beginning of usedArea
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/// \param size_ Size to consume
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/// [unusable][+++++usedArea][freeArea]
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/// becomes
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/// [unusable+++++][usedArea][freeArea]
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void markFree (std::size_t size_);
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/// \brief Produce data to the end of usedArea from freeArea
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/// [unusable][usedArea][++++++freeArea]
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/// becomes
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/// [unusable][usedArea++++++][freeArea]
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void markUsed (std::size_t size_);
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/// \brief Whether usedArea is empty
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bool empty () const;
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/// \brief Get buffer capacity
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std::size_t capacity () const;
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/// \brief Clear buffer; usedArea becomes empty
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/// [unusable][usedArea][++++++freeArea]
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/// becomes
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/// [freeArea++++++++++++++++++++++++++]
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void clear ();
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/// \brief Move usedArea to the beginning of the buffer
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/// [unusable][usedArea][freeArea]
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/// becomes
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/// [usedArea][freeArea++++++++++]
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void coalesce ();
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private:
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/// \brief Buffer
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std::unique_ptr<char[]> m_buffer;
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/// \brief Buffer size
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std::size_t const m_size;
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/// \brief Start of usedArea
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std::size_t m_start = 0;
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/// \brief Start of freeArea
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std::size_t m_end = 0;
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};
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