/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012
* Jonathan Schleifer <js@webkeks.org>
*
* All rights reserved.
*
* This file is part of ObjFW. It may be distributed under the terms of the
* Q Public License 1.0, which can be found in the file LICENSE.QPL included in
* the packaging of this file.
*
* Alternatively, it may be distributed under the terms of the GNU General
* Public License, either version 2 or 3, which can be found in the file
* LICENSE.GPLv2 or LICENSE.GPLv3 respectively included in the packaging of this
* file.
*/
#ifndef __STDC_LIMIT_MACROS
# define __STDC_LIMIT_MACROS
#endif
#ifndef __STDC_CONSTANT_MACROS
# define __STDC_CONSTANT_MACROS
#endif
#include <sys/types.h>
#import "OFStream.h"
/**
* \brief A stream that supports seeking.
*
* \note If you want to subclass this, override lowlevelSeekToOffset:,
* lowlevelSeekForwardWithOffset: and lowlevelSeekToOffsetRelativeToEnd:,
* but nothing else. Those are not defined in the headers, but do the
* actual work. OFSeekableStream uses those and makes them work together
* with the caching of OFStream. If you override these methods without
* the lowlevel prefix, you <i>will</i> break caching, get broken results
* and seek to the wrong position!
*/
@interface OFSeekableStream: OFStream
/**
* \brief Seeks to the specified absolute offset.
*
* \param offset The offset in bytes
*/
- (void)seekToOffset: (off_t)offset;
/**
* \brief Seeks to the specified offset, relative to the current location.
*
* \param offset The offset relative to the current location
* \return The absolute offset
*/
- (off_t)seekForwardWithOffset: (off_t)offset;
/**
* \brief Seeks to the specified offset, relative to the end of the stream.
*
* \param offset The offset relative to the end of the stream
* \return The absolute offset
*/
- (off_t)seekToOffsetRelativeToEnd: (off_t)offset;
/**
* \brief Seek the stream on the lowlevel.
*
* \warning Do not call this directly!
*
* Override this with this method with your actual seek implementation when
* subclassing!
*
* \param offset The offset to seek to
*/
- (void)lowlevelSeekToOffset: (off_t)offset;
/**
* \brief Seek the stream on the lowlevel.
*
* \warning Do not call this directly!
*
* Override this with this method with your actual seek implementation when
* subclassing!
*
* \param offset The offset to seek forward to
*/
- (off_t)lowlevelSeekForwardWithOffset: (off_t)offset;
/**
* \brief Seek the stream on the lowlevel.
*
* \warning Do not call this directly!
*
* Override this with this method with your actual seek implementation when
* subclassing!
*
* \param offset The offset to seek to, relative to the end
*/
- (off_t)lowlevelSeekToOffsetRelativeToEnd: (off_t)offset;
@end