mirror of
https://github.com/mtheall/ftpd.git
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109 lines
2.4 KiB
C++
109 lines
2.4 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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#include "ioBuffer.h"
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#include <cassert>
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#include <cstring>
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///////////////////////////////////////////////////////////////////////////
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IOBuffer::~IOBuffer () = default;
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IOBuffer::IOBuffer (std::size_t const size_)
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: m_buffer (std::make_unique<char[]> (size_)), m_size (size_)
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{
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assert (size_ > 0);
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}
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char *IOBuffer::freeArea () const
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{
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assert (m_end < m_size);
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return &m_buffer[m_end];
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}
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std::size_t IOBuffer::freeSize () const
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{
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assert (m_size >= m_end);
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return m_size - m_end;
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}
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void IOBuffer::markFree (std::size_t size_)
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{
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assert (m_end >= m_start);
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assert (m_end - m_start >= size_);
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m_start += size_;
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// reset back to beginning
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if (m_start == m_end)
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{
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m_start = 0;
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m_end = 0;
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}
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}
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char *IOBuffer::usedArea () const
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{
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assert (m_start < m_size);
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return &m_buffer[m_start];
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}
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std::size_t IOBuffer::usedSize () const
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{
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assert (m_end >= m_start);
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return m_end - m_start;
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}
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void IOBuffer::markUsed (std::size_t size_)
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{
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assert (m_size >= m_end);
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assert (m_size - m_end >= size_);
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m_end += size_;
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}
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bool IOBuffer::empty () const
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{
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assert (m_end >= m_start);
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return (m_end - m_start) == 0;
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}
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std::size_t IOBuffer::capacity () const
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{
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return m_size;
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}
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void IOBuffer::clear ()
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{
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m_start = 0;
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m_end = 0;
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}
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void IOBuffer::coalesce ()
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{
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assert (m_size >= m_end);
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assert (m_end >= m_start);
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auto const size = m_end - m_start;
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if (size != 0)
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std::memmove (&m_buffer[0], &m_buffer[m_start], size);
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m_end -= m_start;
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m_start = 0;
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}
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