BufferedOutputStream.h
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上传日期:2018-11-18
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- /*
- * OpenKore C++ Standard Library
- * Copyright (C) 2006 VCL
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * This library 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
- * MA 02110-1301 USA
- */
- #ifndef _OSL_BUFFERED_OUTPUT_STREAM_H_
- #define _OSL_BUFFERED_OUTPUT_STREAM_H_
- #include "OutputStream.h"
- namespace OSL {
- /**
- * An output stream which wraps another output stream, and buffers
- * a certain amount of data before flushing them, instead of writing
- * data immediately. This results in better performance for some
- * output streams.
- *
- * When a BufferedOutputStream is closed or deleted, its underlying
- * output stream is also closed, and dereferenced.
- *
- * This implementation is NOT thread-safe!
- *
- * @class BufferedOutputStream OSL/IO/BufferedOutputStream.h
- * @ingroup IO
- */
- class BufferedOutputStream: public OutputStream {
- private:
- /** The wrapped stream. Can be NULL. */
- OutputStream *stream;
- /**
- * The buffer.
- * @invariant (stream != NULL) == (buffer != NULL)
- */
- char *buffer;
- /** The maximum buffer size. */
- unsigned int maxsize;
- /**
- * The number of valid bytes in the buffer.
- * @invariant 0 <= count <= maxsize
- */
- unsigned int count;
- public:
- /** The default buffer size. */
- static const unsigned int DEFAULT_BUFFER_SIZE = 512;
- /**
- * Create a new BufferedOutputStream.
- * stream's reference count will be increased by 1.
- *
- * @param stream The output stream to wrap.
- * @param size The maximum size of the buffer.
- * @post stream != NULL
- */
- BufferedOutputStream(OutputStream *stream, unsigned int size = DEFAULT_BUFFER_SIZE);
- ~BufferedOutputStream();
- virtual void close();
- virtual void flush() throw(IOException);
- virtual unsigned int write(const char *data, unsigned int size) throw(IOException);
- };
- }
- #endif /* _OSL_BUFFERED_OUTPUT_STREAM_H_ */