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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright (C) 2011-2019 Brian P. Hinz
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
//
// A MemOutStream grows as needed when data is written to it.
//
package com.tigervnc.rdr;
public class MemOutStream extends OutStream {
public MemOutStream(int len) {
b = new byte[len];
ptr = 0;
end = len;
}
public MemOutStream() { this(1024); }
public int length() { return ptr; }
public void clear() { ptr = 0; };
public void reposition(int pos) { ptr = pos; }
// data() returns a pointer to the buffer.
public final byte[] data() { return b; }
// overrun() either doubles the buffer or adds enough space for nItems of
// size itemSize bytes.
protected int overrun(int itemSize, int nItems) {
int len = ptr + itemSize * nItems;
if (len < end * 2)
len = end * 2;
if (len < end)
throw new Exception("Overflow in MemOutStream::overrun()");
byte[] newBuf = new byte[len];
System.arraycopy(b, 0, newBuf, 0, ptr);
b = newBuf;
end = len;
return nItems;
}
}
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