/*
* Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013
* 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
* @ref lowlevelSeekToOffset:whence:. OFSeekableStream uses this method
* and makes it work together with the caching of OFStream. If you
* override this methods without the lowlevel prefix, you *will* 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
* @param whence From where to seek.@n
* Possible values are:
* Value | Description
* ---------|---------------------------------------
* SEEK_SET | Seek to the specified byte
* SEEK_CUR | Seek to the current location + offset
* SEEK_END | Seek to the end of the stream + offset
* @return The new offset form the start of the file
*/
- (off_t)seekToOffset: (off_t)offset
whence: (int)whence;
/*!
* @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
* @param whence From where to seek.@n
* Possible values are:
* Value | Description
* ---------|---------------------------------------
* SEEK_SET | Seek to the specified byte
* SEEK_CUR | Seek to the current location + offset
* SEEK_END | Seek to the end of the stream + offset
* @return The new offset from the start of the file
*/
- (off_t)lowlevelSeekToOffset: (off_t)offset
whence: (int)whence;
@end