1 files changed, 63 insertions, 0 deletions
diff --git a/vendor/github.com/pion/sctp/paramheader.go b/vendor/github.com/pion/sctp/paramheader.go
new file mode 100644
index 0000000..d88642b
--- /dev/null
+++ b/vendor/github.com/pion/sctp/paramheader.go
@@ -0,0 +1,63 @@
+package sctp
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/pkg/errors"
+)
+
+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) error {
+	if len(raw) < paramHeaderLength {
+		return errors.New("param header too short")
+	}
+
+	paramLengthPlusHeader := binary.BigEndian.Uint16(raw[2:])
+	if int(paramLengthPlusHeader) < paramHeaderLength {
+		return errors.Errorf("param self reported length (%d) smaller than header length (%d)", int(paramLengthPlusHeader), paramHeaderLength)
+	}
+	if len(raw) < int(paramLengthPlusHeader) {
+		return errors.Errorf("param length (%d) shorter than its self reported length (%d)", len(raw), int(paramLengthPlusHeader))
+	}
+
+	typ, err := parseParamType(raw[0:])
+	if err != nil {
+		return errors.Wrap(err, "failed to parse param type")
+	}
+	p.typ = typ
+	p.raw = raw[paramHeaderLength:paramLengthPlusHeader]
+	p.len = int(paramLengthPlusHeader)
+
+	return nil
+}
+
+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, hex.Dump(p.raw))
+}