ObjFW  Check-in [b554732eae]

 * _writeNBytes:fromBuffer: and _atEndOfStream, but nothing else. Those are not
 * defined in the headers, but do the actual work. OFStream uses those and does
 * all the caching and other stuff. If you override these methods without the
 * _ prefix, you *WILL* break caching and get broken results!
 */
@interface OFStream: OFObject
{
@public
	char   *cache;
@protected
	char   *wBuffer;
	size_t cacheLen, wBufferLen;
	BOOL   useWBuffer;
}

/**
 * Returns a boolean whether the end of the stream has been reached.
 *

# include <windows.h>
#endif

@class OFStream;
#ifdef OF_HAVE_POLL
@class OFDataArray;
#endif
@class OFMutableArray;
@class OFMutableDictionary;

/**
 * \brief A protocol that needs to be implemented by delegates for
 *	  OFStreamObserver.
 */
@protocol OFStreamObserverDelegate

@end

/**
 * \brief A class that can observe multiple streams at once.
 */
@interface OFStreamObserver: OFObject
{
	OFMutableArray *readStreams;
	OFMutableArray *writeStreams;
	id <OFStreamObserverDelegate> delegate;
#ifdef OF_HAVE_POLL
	OFDataArray *fds;
	OFMutableDictionary *fdToStream;
#else
	fd_set readfds;
	fd_set writefds;
	int nfds;
#endif

}

#ifdef OF_HAVE_PROPERTIES
@property (retain) id <OFStreamObserverDelegate> delegate;
#endif

/**

#ifdef OF_HAVE_POLL
# include <poll.h>
#endif

#import "OFStreamObserver.h"
#import "OFDataArray.h"
#import "OFArray.h"
#import "OFDictionary.h"
#import "OFStream.h"
#import "OFNumber.h"
#import "OFAutoreleasePool.h"
#import "OFExceptions.h"

@implementation OFStreamObserver
+ streamObserver
{
	return [[[self alloc] init] autorelease];
}

- init
{
	self = [super init];

	@try {
		readStreams = [[OFMutableArray alloc] init];
		writeStreams = [[OFMutableArray alloc] init];
#ifdef OF_HAVE_POLL
		fds = [[OFDataArray alloc] initWithItemSize:
		    sizeof(struct pollfd)];
		fdToStream = [[OFMutableDictionary alloc] init];
#else
		FD_ZERO(&readfds);
		FD_ZERO(&writefds);
#endif
	} @catch (OFException *e) {
		[self dealloc];
		@throw e;
	}

	return self;
}

- (void)dealloc
{
	[(id)delegate release];
	[readStreams release];
	[writeStreams release];
#ifdef OF_HAVE_POLL
	[fdToStream release];
	[fds release];
#endif


	[super dealloc];
}

- (id <OFStreamObserverDelegate>)delegate
{
	return [[(id)delegate retain] autorelease];

		@throw [OFOutOfRangeException newWithClass: isa];

	FD_SET(fd, fdset);

	if (fd >= nfds)
		nfds = fd + 1;




	[pool release];
}

- (void)_removeStream: (OFStream*)stream
	    withFDSet: (fd_set*)fdset
{
	int fd = [stream fileDescriptor];

	if (fd >= FD_SETSIZE)
		@throw [OFOutOfRangeException newWithClass: isa];

	FD_CLR(fd, fdset);








}
#endif

- (void)addStreamToObserveForReading: (OFStream*)stream
{
	[readStreams addObject: stream];

#ifdef OF_HAVE_POLL
	[self _addStream: stream
	      withEvents: POLLIN];
#else
	[self _addStream: stream
	       withFDSet: &readfds];
#endif
}

- (void)addStreamToObserveForWriting: (OFStream*)stream
{
	[writeStreams addObject: stream];

#ifdef OF_HAVE_POLL
	[self _addStream: stream
	      withEvents: POLLOUT];
#else
	[self _addStream: stream
	       withFDSet: &writefds];
#endif
}

- (void)removeStreamToObserveForReading: (OFStream*)stream
{
	[readStreams removeObjectIdenticalTo: stream];

#ifdef OF_HAVE_POLL
	[self _removeStream: stream
		 withEvents: POLLIN];
#else
	[self _removeStream: stream
		  withFDSet: &readfds];
#endif
}

- (void)removeStreamToObserveForWriting: (OFStream*)stream
{
	[writeStreams removeObjectIdenticalTo: stream];

#ifdef OF_HAVE_POLL
	[self _removeStream: stream
		 withEvents: POLLOUT];
#else
	[self _removeStream: stream
		  withFDSet: &writefds];
#endif
}

- (void)observe
{
	[self observeWithTimeout: -1];
}

- (BOOL)observeWithTimeout: (int)timeout
{
	OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
	BOOL foundInCache = NO;
	OFStream **cArray;
	size_t i, count;
#ifdef OF_HAVE_POLL
	struct pollfd *fds_c = [fds cArray];
	size_t nfds = [fds count];
#else
	fd_set readfds_;
	fd_set writefds_;
	fd_set exceptfds_;
	struct timeval tv;
#endif

	cArray = [readStreams cArray];
	count = [readStreams count];

	for (i = 0; i < count; i++) {
		if (cArray[i]->cache != NULL) {
			[delegate streamDidBecomeReadyForReading: cArray[i]];
			foundInCache = YES;
		}
	}

	/*
	 * As long as we have data in the cache for any stream, we don't want
	 * to block.
	 */
	if (foundInCache)
		return YES;

#ifdef OF_HAVE_POLL
	if (poll(fds_c, nfds, timeout) < 1)
		return NO;

	for (i = 0; i < nfds; i++) {
		OFNumber *num;
		OFStream *stream;

			stream = [fdToStream objectForKey: num];
			[delegate streamDidBecomeReadyForReading: stream];
		}

		fds_c[i].revents = 0;
	}
#else







	readfds_ = readfds;
	writefds_ = writefds;
	FD_ZERO(&exceptfds_);

	if (select(nfds, &readfds_, &writefds_, &exceptfds_,
	    (timeout != -1 ? &tv : NULL)) < 1)
		return NO;


	for (i = 0; i < count; i++) {

		int fd = [cArray[i] fileDescriptor];

		if (FD_ISSET(fd, &readfds_))
			[delegate streamDidBecomeReadyForReading: cArray[i]];
	}

	cArray = [writeStreams cArray];
	count = [writeStreams count];

	for (i = 0; i < count; i++) {
		int fd = [cArray[i] fileDescriptor];

		if (FD_ISSET(fd, &readfds_))
			[delegate streamDidBecomeReadyForWriting: cArray[i]];
	}
#endif

	[pool release];

	return YES;
}
@end

@implementation OFObject (OFStreamObserverDelegate)