forked from pion/webrtc
/
param_header.go
45 lines (35 loc) · 1 KB
/
param_header.go
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package sctp
import (
"encoding/binary"
"fmt"
)
type paramHeader struct {
typ paramType
len int
raw []byte
}
const (
paramHeaderLength = 4
)
func (p *paramHeader) marshal() ([]byte, error) {
paramLengthPlusHeader := paramHeaderLength + len(p.raw)
rawParam := make([]byte, paramLengthPlusHeader)
binary.BigEndian.PutUint16(rawParam[0:], uint16(p.typ))
binary.BigEndian.PutUint16(rawParam[2:], uint16(paramLengthPlusHeader))
copy(rawParam[paramHeaderLength:], p.raw)
return rawParam, nil
}
func (p *paramHeader) unmarshal(raw []byte) {
paramLengthPlusHeader := binary.BigEndian.Uint16(raw[2:])
paramLength := paramLengthPlusHeader - initOptionalVarHeaderLength
p.typ = paramType(binary.BigEndian.Uint16(raw[0:]))
p.raw = raw[paramHeaderLength : paramHeaderLength+paramLength]
p.len = int(paramLengthPlusHeader)
}
func (p *paramHeader) length() int {
return p.len
}
// String makes paramHeader printable
func (p paramHeader) String() string {
return fmt.Sprintf("%s (%d): %s", p.typ, p.len, p.raw)
}