Initial commit.

NXDNParrot/Parrot.cpp

@@ -0,0 +1,81 @@
+/*
+*   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),
+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;
+}