P25Clients/P25Parrot/Parrot.cpp

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