1 files changed, 158 insertions, 0 deletions
diff --git a/vendor/github.com/pion/stun/errorcode.go b/vendor/github.com/pion/stun/errorcode.go
new file mode 100644
index 0000000..8095048
--- /dev/null
+++ b/vendor/github.com/pion/stun/errorcode.go
@@ -0,0 +1,158 @@
+package stun
+
+import (
+	"errors"
+	"fmt"
+	"io"
+)
+
+// ErrorCodeAttribute represents ERROR-CODE attribute.
+//
+// RFC 5389 Section 15.6
+type ErrorCodeAttribute struct {
+	Code   ErrorCode
+	Reason []byte
+}
+
+func (c ErrorCodeAttribute) String() string {
+	return fmt.Sprintf("%d: %s", c.Code, c.Reason)
+}
+
+// constants for ERROR-CODE encoding.
+const (
+	errorCodeReasonStart = 4
+	errorCodeClassByte   = 2
+	errorCodeNumberByte  = 3
+	errorCodeReasonMaxB  = 763
+	errorCodeModulo      = 100
+)
+
+// AddTo adds ERROR-CODE to m.
+func (c ErrorCodeAttribute) AddTo(m *Message) error {
+	value := make([]byte, 0, errorCodeReasonMaxB)
+	if err := CheckOverflow(AttrErrorCode,
+		len(c.Reason)+errorCodeReasonStart,
+		errorCodeReasonMaxB+errorCodeReasonStart,
+	); err != nil {
+		return err
+	}
+	value = value[:errorCodeReasonStart+len(c.Reason)]
+	number := byte(c.Code % errorCodeModulo) // error code modulo 100
+	class := byte(c.Code / errorCodeModulo)  // hundred digit
+	value[errorCodeClassByte] = class
+	value[errorCodeNumberByte] = number
+	copy(value[errorCodeReasonStart:], c.Reason)
+	m.Add(AttrErrorCode, value)
+	return nil
+}
+
+// GetFrom decodes ERROR-CODE from m. Reason is valid until m.Raw is valid.
+func (c *ErrorCodeAttribute) GetFrom(m *Message) error {
+	v, err := m.Get(AttrErrorCode)
+	if err != nil {
+		return err
+	}
+	if len(v) < errorCodeReasonStart {
+		return io.ErrUnexpectedEOF
+	}
+	var (
+		class  = uint16(v[errorCodeClassByte])
+		number = uint16(v[errorCodeNumberByte])
+		code   = int(class*errorCodeModulo + number)
+	)
+	c.Code = ErrorCode(code)
+	c.Reason = v[errorCodeReasonStart:]
+	return nil
+}
+
+// ErrorCode is code for ERROR-CODE attribute.
+type ErrorCode int
+
+// ErrNoDefaultReason means that default reason for provided error code
+// is not defined in RFC.
+var ErrNoDefaultReason = errors.New("no default reason for ErrorCode")
+
+// AddTo adds ERROR-CODE with default reason to m. If there
+// is no default reason, returns ErrNoDefaultReason.
+func (c ErrorCode) AddTo(m *Message) error {
+	reason := errorReasons[c]
+	if reason == nil {
+		return ErrNoDefaultReason
+	}
+	a := &ErrorCodeAttribute{
+		Code:   c,
+		Reason: reason,
+	}
+	return a.AddTo(m)
+}
+
+// Possible error codes.
+const (
+	CodeTryAlternate     ErrorCode = 300
+	CodeBadRequest       ErrorCode = 400
+	CodeUnauthorized     ErrorCode = 401
+	CodeUnknownAttribute ErrorCode = 420
+	CodeStaleNonce       ErrorCode = 438
+	CodeRoleConflict     ErrorCode = 487
+	CodeServerError      ErrorCode = 500
+)
+
+// DEPRECATED constants.
+const (
+	// DEPRECATED, use CodeUnauthorized.
+	CodeUnauthorised = CodeUnauthorized
+)
+
+// Error codes from RFC 5766.
+//
+// RFC 5766 Section 15
+const (
+	CodeForbidden             ErrorCode = 403 // Forbidden
+	CodeAllocMismatch         ErrorCode = 437 // Allocation Mismatch
+	CodeWrongCredentials      ErrorCode = 441 // Wrong Credentials
+	CodeUnsupportedTransProto ErrorCode = 442 // Unsupported Transport Protocol
+	CodeAllocQuotaReached     ErrorCode = 486 // Allocation Quota Reached
+	CodeInsufficientCapacity  ErrorCode = 508 // Insufficient Capacity
+)
+
+// Error codes from RFC 6062.
+//
+// RFC 6062 Section 6.3
+const (
+	CodeConnAlreadyExists    ErrorCode = 446
+	CodeConnTimeoutOrFailure ErrorCode = 447
+)
+
+// Error codes from RFC 6156.
+//
+// RFC 6156 Section 10.2
+const (
+	CodeAddrFamilyNotSupported ErrorCode = 440 // Address Family not Supported
+	CodePeerAddrFamilyMismatch ErrorCode = 443 // Peer Address Family Mismatch
+)
+
+var errorReasons = map[ErrorCode][]byte{
+	CodeTryAlternate:     []byte("Try Alternate"),
+	CodeBadRequest:       []byte("Bad Request"),
+	CodeUnauthorized:     []byte("Unauthorized"),
+	CodeUnknownAttribute: []byte("Unknown Attribute"),
+	CodeStaleNonce:       []byte("Stale Nonce"),
+	CodeServerError:      []byte("Server Error"),
+	CodeRoleConflict:     []byte("Role Conflict"),
+
+	// RFC 5766.
+	CodeForbidden:             []byte("Forbidden"),
+	CodeAllocMismatch:         []byte("Allocation Mismatch"),
+	CodeWrongCredentials:      []byte("Wrong Credentials"),
+	CodeUnsupportedTransProto: []byte("Unsupported Transport Protocol"),
+	CodeAllocQuotaReached:     []byte("Allocation Quota Reached"),
+	CodeInsufficientCapacity:  []byte("Insufficient Capacity"),
+
+	// RFC 6062.
+	CodeConnAlreadyExists:    []byte("Connection Already Exists"),
+	CodeConnTimeoutOrFailure: []byte("Connection Timeout or Failure"),
+
+	// RFC 6156.
+	CodeAddrFamilyNotSupported: []byte("Address Family not Supported"),
+	CodePeerAddrFamilyMismatch: []byte("Peer Address Family Mismatch"),
+}