/*
* Copyright (c) 2008-2022 Jonathan Schleifer <js@nil.im>
*
* 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.
*/
#define OF_SEEKABLE_STREAM_M
#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#import "OFSeekableStream.h"
@implementation OFSeekableStream
- (instancetype)init
{
if ([self isMemberOfClass: [OFSeekableStream class]]) {
@try {
[self doesNotRecognizeSelector: _cmd];
abort();
} @catch (id e) {
[self release];
@throw e;
}
}
return [super init];
}
- (OFStreamOffset)lowlevelSeekToOffset: (OFStreamOffset)offset
whence: (OFSeekWhence)whence
{
OF_UNRECOGNIZED_SELECTOR
}
- (OFStreamOffset)seekToOffset: (OFStreamOffset)offset
whence: (OFSeekWhence)whence
{
if (whence == OFSeekCurrent)
offset -= _readBufferLength;
offset = [self lowlevelSeekToOffset: offset whence: whence];
OFFreeMemory(_readBufferMemory);
_readBuffer = _readBufferMemory = NULL;
_readBufferLength = 0;
return offset;
}
@end