ftpiiu_plugin/source/ioBuffer.cpp

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// ftpd is a server implementation based on the following:
// - RFC 959 (https://tools.ietf.org/html/rfc959)
// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
//
// Copyright (C) 2020 Michael Theall
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
#include "ioBuffer.h"
#include <cassert>
#include <cstring>
///////////////////////////////////////////////////////////////////////////
IOBuffer::~IOBuffer () = default;
IOBuffer::IOBuffer (std::size_t const size_)
: m_buffer (std::make_unique<char[]> (size_)), m_size (size_)
{
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assert (size_ > 0);
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}
char *IOBuffer::freeArea () const
{
assert (m_end < m_size);
return &m_buffer[m_end];
}
std::size_t IOBuffer::freeSize () const
{
assert (m_size >= m_end);
return m_size - m_end;
}
void IOBuffer::markFree (std::size_t size_)
{
assert (m_end >= m_start);
assert (m_end - m_start >= size_);
m_start += size_;
// reset back to beginning
if (m_start == m_end)
{
m_start = 0;
m_end = 0;
}
}
char *IOBuffer::usedArea () const
{
assert (m_start < m_size);
return &m_buffer[m_start];
}
std::size_t IOBuffer::usedSize () const
{
assert (m_end >= m_start);
return m_end - m_start;
}
void IOBuffer::markUsed (std::size_t size_)
{
assert (m_size >= m_end);
assert (m_size - m_end >= size_);
m_end += size_;
}
bool IOBuffer::empty () const
{
assert (m_end >= m_start);
return (m_end - m_start) == 0;
}
std::size_t IOBuffer::capacity () const
{
return m_size;
}
void IOBuffer::clear ()
{
m_start = 0;
m_end = 0;
}
void IOBuffer::coalesce ()
{
assert (m_size >= m_end);
assert (m_end >= m_start);
auto const size = m_end - m_start;
if (size != 0)
std::memmove (&m_buffer[0], &m_buffer[m_start], size);
m_end -= m_start;
m_start = 0;
}