83 lines
2.0 KiB
C++
83 lines
2.0 KiB
C++
//
|
|
// 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 <rdr/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
|