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server/vendor/github.com/pion/sctp/param_reconfig_response.go

@@ -0,0 +1,98 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp
+
+import (
+	"encoding/binary"
+	"errors"
+	"fmt"
+)
+
+// This parameter is used by the receiver of a Re-configuration Request
+// Parameter to respond to the request.
+//
+// 0                   1                   2                   3
+// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |     Parameter Type = 16       |      Parameter Length         |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |         Re-configuration Response Sequence Number             |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                            Result                             |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                   Sender's Next TSN (optional)                |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+// |                  Receiver's Next TSN (optional)               |
+// +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+type paramReconfigResponse struct {
+	paramHeader
+	// This value is copied from the request parameter and is used by the
+	// receiver of the Re-configuration Response Parameter to tie the
+	// response to the request.
+	reconfigResponseSequenceNumber uint32
+	// This value describes the result of the processing of the request.
+	result reconfigResult
+}
+
+type reconfigResult uint32
+
+const (
+	reconfigResultSuccessNOP                    reconfigResult = 0
+	reconfigResultSuccessPerformed              reconfigResult = 1
+	reconfigResultDenied                        reconfigResult = 2
+	reconfigResultErrorWrongSSN                 reconfigResult = 3
+	reconfigResultErrorRequestAlreadyInProgress reconfigResult = 4
+	reconfigResultErrorBadSequenceNumber        reconfigResult = 5
+	reconfigResultInProgress                    reconfigResult = 6
+)
+
+// Reconfiguration response errors
+var (
+	ErrReconfigRespParamTooShort = errors.New("reconfig response parameter too short")
+)
+
+func (t reconfigResult) String() string {
+	switch t {
+	case reconfigResultSuccessNOP:
+		return "0: Success - Nothing to do"
+	case reconfigResultSuccessPerformed:
+		return "1: Success - Performed"
+	case reconfigResultDenied:
+		return "2: Denied"
+	case reconfigResultErrorWrongSSN:
+		return "3: Error - Wrong SSN"
+	case reconfigResultErrorRequestAlreadyInProgress:
+		return "4: Error - Request already in progress"
+	case reconfigResultErrorBadSequenceNumber:
+		return "5: Error - Bad Sequence Number"
+	case reconfigResultInProgress:
+		return "6: In progress"
+	default:
+		return fmt.Sprintf("Unknown reconfigResult: %d", t)
+	}
+}
+
+func (r *paramReconfigResponse) marshal() ([]byte, error) {
+	r.typ = reconfigResp
+	r.raw = make([]byte, 8)
+	binary.BigEndian.PutUint32(r.raw, r.reconfigResponseSequenceNumber)
+	binary.BigEndian.PutUint32(r.raw[4:], uint32(r.result))
+
+	return r.paramHeader.marshal()
+}
+
+func (r *paramReconfigResponse) unmarshal(raw []byte) (param, error) {
+	err := r.paramHeader.unmarshal(raw)
+	if err != nil {
+		return nil, err
+	}
+	if len(r.raw) < 8 {
+		return nil, ErrReconfigRespParamTooShort
+	}
+	r.reconfigResponseSequenceNumber = binary.BigEndian.Uint32(r.raw)
+	r.result = reconfigResult(binary.BigEndian.Uint32(r.raw[4:]))
+
+	return r, nil
+}