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/*
* Copyright (c) 2003, 2004 Michael Pyne <michael.pyne@kdemail.net>
*
* This software 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 software 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 library; see the file COPYING.
* If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <kdebug.h>
#include "bytetape.h"
ByteTape::ByteTape (QByteArray &array, int pos)
: m_array(array), m_shared(new ByteTapeShared)
{
m_shared->pos = pos;
}
ByteTape::ByteTape (const ByteTape &tape)
: m_array(tape.m_array), m_shared(tape.m_shared)
{
}
ByteTape& ByteTape::operator += (const unsigned int i)
{
m_shared->pos += i;
if (m_array.size() <= m_shared->pos)
{
kdDebug(7034) << "Whoops. Advanced too far." << endl;
m_shared->pos = m_array.size() - 1;
}
return *this;
}
ByteTape& ByteTape::operator -= (const unsigned int i)
{
if (i > m_shared->pos)
{
kdDebug(7034) << "Whoops, tried to back up too far." << endl;
m_shared->pos = 0;
}
else
m_shared->pos -= i;
return *this;
}
char ByteTape::operator [] (const unsigned int i)
{
if (i < m_array.size())
return m_array[i];
else
{
kdWarning() << "Can't dereference tape at " << i
<< ", size is " << m_array.size() << endl;
return 0;
}
}
char &ByteTape::operator * ()
{
return m_array[m_shared->pos];
}
// Postfix increment
ByteTape ByteTape::operator ++ (int)
{
// Can't use copy ctor, as we'll be copying shared data, which defeats
// the semantics of the postfix operator.
ByteTape temp(m_array, m_shared->pos);
m_shared->pos ++;
if (m_shared->pos >= m_array.size())
{
m_shared->pos = m_array.size() - 1;
kdDebug(7034) << "Tape already at end!" << endl;
kdDebug(7034) << "Tape size is " << m_array.size() << endl;
}
return temp;
}
// Prefix increment
ByteTape & ByteTape::operator ++()
{
m_shared->pos ++;
if (m_shared->pos >= m_array.size())
{
m_shared->pos = m_array.size() - 1;
kdDebug(7034) << "Tape already at end!" << endl;
kdDebug(7034) << "Tape size is " << m_array.size() << endl;
}
return *this;
}
// Postfix decrement
ByteTape ByteTape::operator -- (int)
{
// Can't use copy ctor, as we'll be copying shared data, which defeats
// the semantics of the postfix operator.
ByteTape temp(m_array, m_shared->pos);
if (m_shared->pos != 0)
m_shared->pos --;
else
kdDebug(7034) << "Tape already at beginning!" << endl;
return temp;
}
// Prefix decrement
ByteTape & ByteTape::operator -- ()
{
if (m_shared->pos != 0)
m_shared->pos --;
else
kdDebug(7034) << "Tape already at beginning!" << endl;
return *this;
}
bool ByteTape::setPos (unsigned int pos)
{
if (pos >= m_array.size())
{
kdDebug(7034) << "Can't set tape to " << pos << endl;
return false;
}
m_shared->pos = pos;
return true;
}
char* ByteTape::at (const unsigned int i)
{
if (i >= m_array.size())
{
kdDebug(7034) << "Access to tape at " << i << " out-of-range." << endl;
return 0;
}
return m_array.data() + i;
}
// vim: set et ts=4 sw=4:
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