From af08c84539f9353718604988ba27ae3c466860fc Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Tue, 10 Mar 2026 13:28:59 +0800
Subject: *: Move sideband64k and pktline to protocol/

---
 protocol/sideband64k/errors.go | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 protocol/sideband64k/errors.go

(limited to 'protocol/sideband64k/errors.go')

diff --git a/protocol/sideband64k/errors.go b/protocol/sideband64k/errors.go
new file mode 100644
index 00000000..44e7c165
--- /dev/null
+++ b/protocol/sideband64k/errors.go
@@ -0,0 +1,27 @@
+package sideband64k
+
+import "errors"
+
+var (
+	// ErrTooLarge indicates a payload exceeds configured sideband data limits.
+	ErrTooLarge = errors.New("sideband64k: payload too large")
+	// ErrInvalidBand indicates a data frame has an invalid sideband designator.
+	ErrInvalidBand = errors.New("sideband64k: invalid band designator")
+)
+
+// ProtocolError reports invalid side-band-64k framing.
+type ProtocolError struct {
+	Reason string
+}
+
+func (e *ProtocolError) Error() string {
+	if e == nil {
+		return "<nil>"
+	}
+
+	if e.Reason == "" {
+		return "sideband64k: protocol error"
+	}
+
+	return "sideband64k: protocol error: " + e.Reason
+}
-- 
cgit v1.3.1-10-gc9f91