ObjFW  Diff

 *	 @ref lowlevelReadIntoBuffer:length:, @ref lowlevelWriteBuffer:length:
 *	 and @ref lowlevelIsAtEndOfStream, but nothing else, as those are are
 *	 the methods that do the actual work. OFStream uses those for all other
 *	 methods and does all the caching and other stuff for you. If you
 *	 override these methods without the `lowlevel` prefix, you *will* break
 *	 caching and get broken results!
 */
@interface OFStream: OFObject <
#ifdef OF_HAVE_SOCKETS
    OFReadyForReadingObserving, OFReadyForWritingObserving,
#endif
    OFCopying>
{
#if !defined(OF_SEEKABLE_STREAM_M) && !defined(OF_TCP_SOCKET_M)
@private
#endif
	char *_Nullable _readBuffer, *_Nullable _readBufferMemory;
	char *_Nullable _writeBuffer;
	size_t _readBufferLength, _writeBufferLength;

 * @brief Whether the stream is in blocking mode.
 *
 * By default, a stream is in blocking mode.
 * On Win32, setting this currently only works for sockets!
 */
@property (readonly, nonatomic, getter=isBlocking) bool blocking;

/*!
 * @brief The file descriptor for the read end of the stream.
 */
@property (readonly, nonatomic) int fileDescriptorForReading;

/*!
 * @brief The file descriptor for the write end of the stream.
 */
@property (readonly, nonatomic) int fileDescriptorForWriting;

/*!
 * @brief Reads *at most* size bytes from the stream into a buffer.
 *
 * On network streams, this might read less than the specified number of bytes.
 * If you want to read exactly the specified number of bytes, use
 * @ref readIntoBuffer:exactLength:. Note that a read can even return 0 bytes -
 * this does not necessarily mean that the stream ended, so you still need to

 *
 * On network streams, this might read less than the specified number of bytes.
 * If you want to read exactly the specified number of bytes, use
 * @ref asyncReadIntoBuffer:exactLength:target:selector:context:. Note that a
 * read can even return 0 bytes - this does not necessarily mean that the
 * stream ended, so you still need to check @ref atEndOfStream.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer into which the data is read.
 *		 The buffer must not be freed before the async read completed!
 * @param length The length of the data that should be read at most.
 *		 The buffer *must* be *at least* this big!
 * @param target The target on which the selector should be called when the
 *		 data has been received. If the method returns true, it will be

 *	  stream into a buffer.
 *
 * Unlike @ref asyncReadIntoBuffer:length:target:selector:context:, this method
 * does not call the method when less than the specified length has been read -
 * instead, it waits until it got exactly the specified length, the stream has
 * ended or an exception occurred.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer into which the data is read
 * @param length The length of the data that should be read.
 *		 The buffer *must* be *at least* this big!
 * @param target The target on which the selector should be called when the
 *		 data has been received. If the method returns true, it will be
 *		 called again with the same buffer and exact length when more

 *
 * On network streams, this might read less than the specified number of bytes.
 * If you want to read exactly the specified number of bytes, use
 * @ref asyncReadIntoBuffer:exactLength:block:. Note that a read can even
 * return 0 bytes - this does not necessarily mean that the stream ended, so
 * you still need to check @ref atEndOfStream.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer into which the data is read.
 *		 The buffer must not be freed before the async read completed!
 * @param length The length of the data that should be read at most.
 *		 The buffer *must* be *at least* this big!
 * @param block The block to call when the data has been received.
 *		If the block returns true, it will be called again with the same

 *	  stream into a buffer.
 *
 * Unlike @ref asyncReadIntoBuffer:length:block:, this method does not invoke
 * the block when less than the specified length has been read - instead, it
 * waits until it got exactly the specified length, the stream has ended or an
 * exception occurred.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer into which the data is read
 * @param length The length of the data that should be read.
 *		 The buffer *must* be *at least* this big!
 * @param block The block to call when the data has been received.
 *		If the block returns true, it will be called again with the same
 *		buffer and exact length when more data has been received. If

- (nullable OFString *)readLineWithEncoding: (of_string_encoding_t)encoding;

#ifdef OF_HAVE_SOCKETS
/*!
 * @brief Asynchronously reads until a newline, `\0`, end of stream or an
 *	  exception occurs.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param target The target on which to call the selector when the data has
 *		 been received. If the method returns true, it will be called
 *		 again when the next line has been received. If you want the
 *		 next method in the queue to handle the next line, you need to
 *		 return false from the method
 * @param selector The selector to call on the target. The signature must be
 *		   `bool (OFStream *stream, OFString *line, id context,
 *		   id exception)`.
 * @param context A context object to pass along to the target
 */
- (void)asyncReadLineWithTarget: (id)target
		       selector: (SEL)selector
			context: (nullable id)context;

/*!
 * @brief Asynchronously reads with the specified encoding until a newline,
 *	  `\0`, end of stream or an exception occurs.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param encoding The encoding used by the stream
 * @param target The target on which to call the selector when the data has
 *		 been received. If the method returns true, it will be called
 *		 again when the next line has been received. If you want the
 *		 next method in the queue to handle the next line, you need to
 *		 return false from the method

			  context: (nullable id)context;

# ifdef OF_HAVE_BLOCKS
/*!
 * @brief Asynchronously reads until a newline, `\0`, end of stream or an
 *	  exception occurs.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param block The block to call when the data has been received.
 *		If the block returns true, it will be called again when the next
 *		line has been received. If you want the next block in the queue
 *		to handle the next line, you need to return false from the
 *		block.
 */
- (void)asyncReadLineWithBlock: (of_stream_async_read_line_block_t)block;

/*!
 * @brief Asynchronously reads with the specified encoding until a newline,
 *	  `\0`, end of stream or an exception occurs.
 *
 * @note The stream must implement @ref fileDescriptorForReading and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param encoding The encoding used by the stream
 * @param block The block to call when the data has been received.
 *		If the block returns true, it will be called again when the next
 *		line has been received. If you want the next block in the queue
 *		to handle the next line, you need to return false from the
 *		block.

- (size_t)writeBuffer: (const void *)buffer
	       length: (size_t)length;

#ifdef OF_HAVE_SOCKETS
/*!
 * @brief Asynchronously writes a buffer into the stream.
 *
 * @note The stream must implement @ref fileDescriptorForWriting and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer from which the data is written into the stream. The
 *		 buffer needs to be valid until the write request is completed!
 * @param length The length of the data that should be written
 * @param target The target on which the selector should be called when the
 *		 data has been written. The method should return the length for
 *		 the next write with the same callback or 0 if it should not

		selector: (SEL)selector
		 context: (nullable id)context;

# ifdef OF_HAVE_BLOCKS
/*!
 * @brief Asynchronously writes a buffer into the stream.
 *
 * @note The stream must implement @ref fileDescriptorForWriting and return a
 *	 valid file descriptor in order for this to work!
 *
 * @param buffer The buffer from which the data is written into the stream. The
 *		 buffer needs to be valid until the write request is completed!
 * @param length The length of the data that should be written
 * @param block The block to call when the data has been written. It should
 *		return the length for the next write with the same callback or
 *		0 if it should not repeat. The buffer may be changed, so that