NullOutStream.cxx
1.52 KB
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//
// Copyright (C) 2002 RealVNC Ltd. All Rights Reserved.
//
// This 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 software; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
// USA.
#include "NullOutStream.h"
#include "Exception.h"
using namespace rdr;
static const int bufferSize = 1024;
NullOutStream::NullOutStream()
: offset(0)
{
start = ptr = new U8[bufferSize];
end = start + bufferSize;
}
NullOutStream::~NullOutStream()
{
delete [] start;
}
int NullOutStream::length()
{
return offset + ptr - start;
}
void NullOutStream::writeBytes(const void* data, int length)
{
offset += length;
}
int NullOutStream::overrun(int itemSize, int nItems)
{
if (itemSize > bufferSize)
throw Exception("NullOutStream overrun: max itemSize exceeded");
offset += ptr - start;
ptr = start;
if (itemSize * nItems > end - ptr)
nItems = (end - ptr) / itemSize;
return nItems;
}