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packet.go
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packet.go
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/**
* 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)
}