/*
* Copyright (c) 2008-2024 Jonathan Schleifer <js@nil.im>
*
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License version 3.0 only,
* as published by the Free Software Foundation.
*
* This program 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
* version 3.0 for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* version 3.0 along with this program. If not, see
* <https://www.gnu.org/licenses/>.
*/
#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