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

@@ -0,0 +1,103 @@
+// SPDX-FileCopyrightText: 2023 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+package sctp // nolint:dupl
+
+import (
+	"errors"
+	"fmt"
+)
+
+/*
+Operation Error (ERROR) (9)
+
+An endpoint sends this chunk to its peer endpoint to notify it of
+certain error conditions.  It contains one or more error causes.  An
+Operation Error is not considered fatal in and of itself, but may be
+used with an ERROR chunk to report a fatal condition.  It has the
+following parameters:
+
+	 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
+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	|   Type = 9    | Chunk  Flags  |           Length              |
+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+	\                                                               \
+	/                    one or more Error Causes                   /
+	\                                                               \
+	+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+
+Chunk Flags: 8 bits
+
+	Set to 0 on transmit and ignored on receipt.
+
+Length: 16 bits (unsigned integer)
+
+	Set to the size of the chunk in bytes, including the chunk header
+	and all the Error Cause fields present.
+*/
+type chunkError struct {
+	chunkHeader
+	errorCauses []errorCause
+}
+
+// Error chunk errors
+var (
+	ErrChunkTypeNotCtError   = errors.New("ChunkType is not of type ctError")
+	ErrBuildErrorChunkFailed = errors.New("failed build Error Chunk")
+)
+
+func (a *chunkError) unmarshal(raw []byte) error {
+	if err := a.chunkHeader.unmarshal(raw); err != nil {
+		return err
+	}
+
+	if a.typ != ctError {
+		return fmt.Errorf("%w, actually is %s", ErrChunkTypeNotCtError, a.typ.String())
+	}
+
+	offset := chunkHeaderSize
+	for {
+		if len(raw)-offset < 4 {
+			break
+		}
+
+		e, err := buildErrorCause(raw[offset:])
+		if err != nil {
+			return fmt.Errorf("%w: %v", ErrBuildErrorChunkFailed, err) //nolint:errorlint
+		}
+
+		offset += int(e.length())
+		a.errorCauses = append(a.errorCauses, e)
+	}
+	return nil
+}
+
+func (a *chunkError) marshal() ([]byte, error) {
+	a.chunkHeader.typ = ctError
+	a.flags = 0x00
+	a.raw = []byte{}
+	for _, ec := range a.errorCauses {
+		raw, err := ec.marshal()
+		if err != nil {
+			return nil, err
+		}
+		a.raw = append(a.raw, raw...)
+	}
+	return a.chunkHeader.marshal()
+}
+
+func (a *chunkError) check() (abort bool, err error) {
+	return false, nil
+}
+
+// String makes chunkError printable
+func (a *chunkError) String() string {
+	res := a.chunkHeader.String()
+
+	for _, cause := range a.errorCauses {
+		res += fmt.Sprintf("\n - %s", cause)
+	}
+
+	return res
+}