# nw_framer_parse_completion_t A handler that examines a range of data being sent or received. ``` typealias nw_framer_parse_completion_t = (UnsafeMutablePointer?, Int, Bool) -> Int ``` ## Parameters `buffer` The pointer to bytes to parse. `buffer_length` The length of the buffer. `is_complete` A boolean indicating if this span of bytes represents the end of a message. ## Return Value Return the number of bytes by which to increment the input or output cursor. Once the cursor is moved, previous bytes will no longer be delivered to [`nw_framer_parse_input(_:_:_:_:_:)`](/documentation/Network/nw_framer_parse_input(_:_:_:_:_:)) and [`nw_framer_deliver_input_no_copy(_:_:_:_:)`](/documentation/Network/nw_framer_deliver_input_no_copy(_:_:_:_:)) for input data, or [`nw_framer_parse_output(_:_:_:_:_:)`](/documentation/Network/nw_framer_parse_output(_:_:_:_:_:)) and [`nw_framer_write_output_no_copy(_:_:)`](/documentation/Network/nw_framer_write_output_no_copy(_:_:)) for output messages. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)