| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package nmserial |
| |
| import ( |
| "bytes" |
| ) |
| |
| type Packet struct { |
| expectedLen uint16 |
| buffer *bytes.Buffer |
| } |
| |
| func NewPacket(expectedLen uint16) (*Packet, error) { |
| pkt := &Packet{ |
| expectedLen: expectedLen, |
| buffer: bytes.NewBuffer([]byte{}), |
| } |
| |
| return pkt, nil |
| } |
| |
| func (pkt *Packet) AddBytes(bytes []byte) bool { |
| pkt.buffer.Write(bytes) |
| if pkt.buffer.Len() >= int(pkt.expectedLen) { |
| return true |
| } else { |
| return false |
| } |
| } |
| |
| func (pkt *Packet) GetBytes() []byte { |
| return pkt.buffer.Bytes() |
| } |
| |
| func (pkt *Packet) TrimEnd(count int) { |
| |
| if pkt.buffer.Len() < count { |
| count = pkt.buffer.Len() |
| } |
| pkt.buffer.Truncate(pkt.buffer.Len() - count) |
| } |