InputStream.h.svn-base
上传用户:market2
上传日期:2018-11-18
资源大小:18786k
文件大小:3k
- /*
- * 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_INPUT_STREAM_H_
- #define _OSL_INPUT_STREAM_H_
- #include "../Object.h"
- #include "IOException.h"
- namespace OSL {
- /**
- * An abstract class for all input stream classes.
- *
- * An input stream is a stream from which data can be read. Where
- * the data originally came from depends on the concrete subclass.
- *
- * @note
- * This abstract class does not guarantee thread-safety. Thread-safety
- * depends on the concrete subclass. Though you can use
- * createThreadSafe() to create a thread-safe wrapper around this class.
- *
- * @class InputStream OSL/IO/InputStream.h
- * @ingroup IO
- */
- class InputStream: public Object {
- public:
- /**
- * Flush and close this stream. If the stream is already
- * closed, then this function does nothing.
- */
- virtual void close() = 0;
- /**
- * Check whether the end of the stream has been reached.
- *
- * @throws IOException
- */
- virtual bool eof() const throw(IOException) = 0;
- /**
- * Read up to size bytes of data from this stream.
- *
- * @param buffer The buffer to receive the read data.
- * @param size The maximum size of buffer.
- * @return The number of bytes read, which may be smaller than size, and may even be 0.
- * Returns -1 if the end of the stream has been reached.
- * @pre buffer != NULL
- * @pre size > 0
- * @post if eof(): result == -1
- * @throws IOException
- */
- virtual int read(char *buffer, unsigned int size) throw(IOException) = 0;
- /**
- * Create a thread-safe wrapper around this InputStream.
- *
- * @post
- * The current InputStream's reference will be increased by 1,
- * and the return value will have a reference count of 1.
- * @post
- * result != NULL
- *
- * @note
- * The return value holds a reference to the current InputStream.
- * When the return value is deleted, the current InputStream will be
- * dereferenced. So make sure the current InputStream is not deleted
- * manually before the return value is deleted. It's recommended that
- * you use Object::ref() and Object::unref() instead of @c new and
- * @c delete.
- */
- virtual InputStream *createThreadSafe() throw();
- };
- }
- #endif /* _OSL_INPUT_STREAM_H_ */