82 lines
1.7 KiB
C++
82 lines
1.7 KiB
C++
/*
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* Copyright (C) 2016 by Jonathan Naylor G4KLX
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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 2 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, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "Parrot.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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CParrot::CParrot(unsigned int timeout) :
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m_data(NULL),
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m_length(timeout * 1000U + 1000U),
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m_used(0U),
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m_ptr(0U)
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{
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assert(timeout > 0U);
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m_data = new unsigned char[m_length];
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}
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CParrot::~CParrot()
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{
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delete[] m_data;
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}
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bool CParrot::write(const unsigned char* data, unsigned int length)
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{
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assert(data != NULL);
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if ((m_length - m_used) < (length + 2U))
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return false;
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m_data[m_used] = length;
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::memcpy(m_data + m_used + 1U, data, length);
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m_used += length + 1U;
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return true;
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}
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void CParrot::end()
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{
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m_ptr = 0U;
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}
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void CParrot::clear()
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{
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m_used = 0U;
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m_ptr = 0U;
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}
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unsigned int CParrot::read(unsigned char* data)
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{
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assert(data != NULL);
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if (m_used == 0U)
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return 0U;
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unsigned int length = m_data[m_ptr];
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::memcpy(data, m_data + m_ptr + 1U, length);
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m_ptr += length + 1U;
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if (m_ptr >= m_used)
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m_used = 0U;
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return length;
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}
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