/* * Copyright (c) 2008-2021 Jonathan Schleifer * * 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 #include #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]; } - (OFFileOffset)lowlevelSeekToOffset: (OFFileOffset)offset whence: (int)whence { OF_UNRECOGNIZED_SELECTOR } - (OFFileOffset)seekToOffset: (OFFileOffset)offset whence: (int)whence { if (whence == SEEK_CUR) offset -= _readBufferLength; offset = [self lowlevelSeekToOffset: offset whence: whence]; OFFreeMemory(_readBufferMemory); _readBuffer = _readBufferMemory = NULL; _readBufferLength = 0; return offset; } @end