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- /* Copyright (C) 2002-2005 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/Exception.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;
- }
-
- size_t length() { return ptr - start; }
- void clear() { ptr = start; };
- void clearAndZero() { memset(start, 0, ptr-start); clear(); }
- void reposition(size_t pos) { ptr = start + pos; }
-
- // data() returns a pointer to the buffer.
-
- const void* data() { return (const void*)start; }
-
- protected:
-
- // overrun() either doubles the buffer or adds enough space for
- // needed bytes.
-
- virtual void overrun(size_t needed) {
- size_t len = ptr - start + needed;
- if (len < (size_t)(end - start) * 2)
- len = (end - start) * 2;
-
- if (len < (size_t)(end - start))
- throw Exception("Overflow in MemOutStream::overrun()");
-
- U8* newStart = new U8[len];
- memcpy(newStart, start, ptr - start);
- ptr = newStart + (ptr - start);
- delete [] start;
- start = newStart;
- end = newStart + len;
- }
-
- U8* start;
- };
-
- }
-
- #endif
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