ObjFW  Diff

				uint32_t u32[1024 / sizeof(uint32_t)];
			} buffer;
			bool empty = true;

			if (![_stream isKindOfClass: [OFSeekableStream class]])
				@throw [OFInvalidArgumentException exception];

			[stream seekToOffset: -1024
				      whence: SEEK_END];
			[stream readIntoBuffer: buffer.c
				   exactLength: 1024];
			[_stream seekToOffset: -1024
				       whence: SEEK_END];
			[_stream readIntoBuffer: buffer.c
				    exactLength: 1024];

			for (size_t i = 0; i < 1024 / sizeof(uint32_t); i++)
				if (buffer.u32[i] != 0)
					empty = false;

			if (!empty)
				@throw [OFInvalidFormatException exception];

			[stream seekToOffset: -1024
				      whence: SEEK_END];
			[_stream seekToOffset: -1024
				       whence: SEEK_END];
		}

		_encoding = OF_STRING_ENCODING_UTF_8;
	} @catch (id e) {
		[self release];
		@throw e;
	}

			[_stream readIntoBuffer: buffer
				    exactLength: (size_t)(512 - (size % 512))];
	}
}
@end

@implementation OFTarArchive_FileWriteStream
- (instancetype)of_initWithStream: (OFStream *)stream
- (instancetype)of_initWithStream: (OF_KINDOF(OFStream *))stream
			    entry: (OFTarArchiveEntry *)entry
{
	self = [super init];

	@try {
		_entry = [entry copy];
		_stream = [stream retain];