MemOutStream.h
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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.
//
// A MemOutStream grows as needed when data is written to it.
//
#ifndef __RDR_MEMOUTSTREAM_H__
#define __RDR_MEMOUTSTREAM_H__
#include "OutStream.h"
namespace rdr {
class MemOutStream : public OutStream {
public:
MemOutStream(int len=1024) {
start = ptr = new U8[len];
end = start + len;
}
virtual ~MemOutStream() {
delete [] start;
}
void writeBytes(const void* data, int length) {
check(length);
memcpy(ptr, data, length);
ptr += length;
}
int length() { return ptr - start; }
void clear() { ptr = start; };
void reposition(int pos) { ptr = start + pos; }
// data() returns a pointer to the buffer.
const void* data() { return (const void*)start; }
private:
// overrun() either doubles the buffer or adds enough space for nItems of
// size itemSize bytes.
int overrun(int itemSize, int nItems) {
int len = ptr - start + itemSize * nItems;
if (len < (end - start) * 2)
len = (end - start) * 2;
U8* newStart = new U8[len];
memcpy(newStart, start, ptr - start);
ptr = newStart + (ptr - start);
delete [] start;
start = newStart;
end = newStart + len;
return nItems;
}
U8* start;
};
}
#endif