/// returns number of bytes consumed and the complete message, if there is one.
returns number of bytes consumed and the complete message, if there is one.
returns number of bytes consumed and the complete message if there is one .
fn advance(&mut self, buf: &[u8]) -> (usize, Option<ParseResult>) {
        use self::ParserState::*;
        let (new_state, result) = match self {
            &mut NotStarted => {
                if buf.len() < 1 {
                    return (0, None)
                }
                (DoneFirstByte { fin: (buf[0] & 0x80) != 0, opcode: buf[0] & 0xf }, (1, None))
            }
            &mut DoneFirstByte { fin, opcode } => {
                if buf.len() < 1 {
                    return (0, None)
                }
                let masked = (buf[0] & 0x80) != 0;
                match buf[0] & 0x7f {
                    126 => {
                        (ReadingLongPayloadLength {
                            fin: fin,
                            opcode: opcode,
                            masked: masked,
                            payload_len_bytes_read: 6,
                            payload_len_so_far: 0,
                        }, (1, None))
                    }
                    127 => {
                        (ReadingLongPayloadLength {
                            fin: fin,
                            opcode: opcode,
                            masked: masked,
                            payload_len_bytes_read: 0,
                            payload_len_so_far: 0,
                        }, (1, None))
                    }
                    n => ParserState::done_payload_length(1, fin, opcode, masked, n as u64)
                }
            }
            &mut ReadingLongPayloadLength { fin, opcode, masked, payload_len_bytes_read,
                                            payload_len_so_far } => {
                let mut idx = 0;
                let mut new_so_far = payload_len_so_far;
                while idx + payload_len_bytes_read < 8 && idx < buf.len() {
                    new_so_far += (buf[idx] as u64) << (8 * (7 - idx - payload_len_bytes_read));
                    idx += 1;
                }
                if buf.len() + payload_len_bytes_read < 8 {
                    (ReadingLongPayloadLength {
                        fin: fin,
                        opcode: opcode,
                        masked: masked,
                        payload_len_bytes_read: idx + payload_len_bytes_read,
                        payload_len_so_far: new_so_far,
                    }, (idx, None))
                } else {
                    ParserState::done_payload_length(idx, fin, opcode, masked, new_so_far)
                }
            }
            &mut ReadingMask { fin, opcode, mask_bytes_read, payload_len, mask_so_far } => {
                let mut idx = 0;
                let mut new_so_far = mask_so_far;
                while idx + mask_bytes_read < 4 && idx < buf.len() {
                    new_so_far[idx] = buf[idx];
                    idx += 1;
                }
                if buf.len() + mask_bytes_read < 4 {
                    (ReadingMask {
                        fin: fin,
                        opcode: opcode,
                        payload_len: payload_len,
                        mask_bytes_read: idx + mask_bytes_read,
                        mask_so_far: new_so_far,
                    }, (idx, None))
                } else if payload_len == 0 {
                    (NotStarted,
                     (idx, Some(ParseResult { frame: Vec::new(), fin: fin, opcode: opcode })))
                } else {
                    (ReadingPayload { fin: fin, opcode: opcode, mask: new_so_far,
                                      bytes_so_far: Vec::new(),
                                      payload_len: payload_len },
                     (idx, None))
                }
            }
            &mut ReadingPayload { fin, opcode, payload_len, mask, ref mut bytes_so_far } => {
                let mut idx = 0;
                while (bytes_so_far.len() as u64) < payload_len && idx < buf.len() {
                    let mask_byte = mask[bytes_so_far.len() % 4];
                    bytes_so_far.push(buf[idx] ^ mask_byte);
                    idx += 1;
                }
                if (bytes_so_far.len() as u64) < payload_len {
                    return (idx, None)
                } else {
                    let frame = ::std::mem::replace(bytes_so_far, Vec::new());
                    (NotStarted,
                     (idx, Some(ParseResult { frame: frame, fin: fin, opcode: opcode })))
                }
            }
        };
        *self = new_state;
        result
    }
fn advance ( & mut self , buf : & [ u8 ] ) -> ( usize , Option < ParseResult > ) { use self :: ParserState :: * ; let ( new_state , result ) = match self { & mut NotStarted => { if buf . len ( ) < 1 { return ( 0 , None ) } ( DoneFirstByte { fin : ( buf [ 0 ] & 0x80 ) != 0 , opcode : buf [ 0 ] & 0xf } , ( 1 , None ) ) } & mut DoneFirstByte { fin , opcode } => { if buf . len ( ) < 1 { return ( 0 , None ) } let masked = ( buf [ 0 ] & 0x80 ) != 0 ; match buf [ 0 ] & 0x7f { 126 => { ( ReadingLongPayloadLength { fin : fin , opcode : opcode , masked : masked , payload_len_bytes_read : 6 , payload_len_so_far : 0 , } , ( 1 , None ) ) } 127 => { ( ReadingLongPayloadLength { fin : fin , opcode : opcode , masked : masked , payload_len_bytes_read : 0 , payload_len_so_far : 0 , } , ( 1 , None ) ) } n => ParserState :: done_payload_length ( 1 , fin , opcode , masked , n as u64 ) } } & mut ReadingLongPayloadLength { fin , opcode , masked , payload_len_bytes_read , payload_len_so_far } => { let mut idx = 0 ; let mut new_so_far = payload_len_so_far ; while idx + payload_len_bytes_read < 8 && idx < buf . len ( ) { new_so_far += ( buf [ idx ] as u64 ) << ( 8 * ( 7 - idx - payload_len_bytes_read ) ) ; idx += 1 ; } if buf . len ( ) + payload_len_bytes_read < 8 { ( ReadingLongPayloadLength { fin : fin , opcode : opcode , masked : masked , payload_len_bytes_read : idx + payload_len_bytes_read , payload_len_so_far : new_so_far , } , ( idx , None ) ) } else { ParserState :: done_payload_length ( idx , fin , opcode , masked , new_so_far ) } } & mut ReadingMask { fin , opcode , mask_bytes_read , payload_len , mask_so_far } => { let mut idx = 0 ; let mut new_so_far = mask_so_far ; while idx + mask_bytes_read < 4 && idx < buf . len ( ) { new_so_far [ idx ] = buf [ idx ] ; idx += 1 ; } if buf . len ( ) + mask_bytes_read < 4 { ( ReadingMask { fin : fin , opcode : opcode , payload_len : payload_len , mask_bytes_read : idx + mask_bytes_read , mask_so_far : new_so_far , } , ( idx , None ) ) } else if payload_len == 0 { ( NotStarted , ( idx , Some ( ParseResult { frame : Vec :: new ( ) , fin : fin , opcode : opcode } ) ) ) } else { ( ReadingPayload { fin : fin , opcode : opcode , mask : new_so_far , bytes_so_far : Vec :: new ( ) , payload_len : payload_len } , ( idx , None ) ) } } & mut ReadingPayload { fin , opcode , payload_len , mask , ref mut bytes_so_far } => { let mut idx = 0 ; while ( bytes_so_far . len ( ) as u64 ) < payload_len && idx < buf . len ( ) { let mask_byte = mask [ bytes_so_far . len ( ) % 4 ] ; bytes_so_far . push ( buf [ idx ] ^ mask_byte ) ; idx += 1 ; } if ( bytes_so_far . len ( ) as u64 ) < payload_len { return ( idx , None ) } else { let frame = :: std :: mem :: replace ( bytes_so_far , Vec :: new ( ) ) ; ( NotStarted , ( idx , Some ( ParseResult { frame : frame , fin : fin , opcode : opcode } ) ) ) } } } ; * self = new_state ; result }
returns number of bytes consumed and the complete message, if there is one.
returns number of bytes consumed and the complete message if there is one .
&mut self
buf
&[u8]