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80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
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*
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* This is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this software; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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* USA.
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*/
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//
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// A MemOutStream grows as needed when data is written to it.
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//
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#ifndef __RDR_MEMOUTSTREAM_H__
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#define __RDR_MEMOUTSTREAM_H__
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#include <rdr/Exception.h>
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#include <rdr/OutStream.h>
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namespace rdr {
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class MemOutStream : public OutStream {
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public:
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MemOutStream(int len=1024) {
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start = ptr = new U8[len];
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end = start + len;
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}
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virtual ~MemOutStream() {
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delete [] start;
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}
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size_t length() { return ptr - start; }
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void clear() { ptr = start; };
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void clearAndZero() { memset(start, 0, ptr-start); clear(); }
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void reposition(size_t pos) { ptr = start + pos; }
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// data() returns a pointer to the buffer.
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const void* data() { return (const void*)start; }
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protected:
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// overrun() either doubles the buffer or adds enough space for
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// needed bytes.
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virtual void overrun(size_t needed) {
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size_t len = ptr - start + needed;
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if (len < (size_t)(end - start) * 2)
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len = (end - start) * 2;
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if (len < (size_t)(end - start))
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throw Exception("Overflow in MemOutStream::overrun()");
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U8* newStart = new U8[len];
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memcpy(newStart, start, ptr - start);
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ptr = newStart + (ptr - start);
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delete [] start;
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start = newStart;
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end = newStart + len;
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}
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U8* start;
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};
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}
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#endif
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