From 4b8d39764f9b54ea3090d0fea92a23025dbea30d Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Sat, 7 Mar 2026 14:24:05 +0800
Subject: protocol: Add v0v1 server protocol and its receivepack subprotocol

---
 protocol/v0v1/server/errors.go | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 protocol/v0v1/server/errors.go

(limited to 'protocol/v0v1/server/errors.go')

diff --git a/protocol/v0v1/server/errors.go b/protocol/v0v1/server/errors.go
new file mode 100644
index 00000000..6a456234
--- /dev/null
+++ b/protocol/v0v1/server/errors.go
@@ -0,0 +1,18 @@
+package server
+
+// ProtocolError reports one malformed or unsupported protocol input.
+type ProtocolError struct {
+	Reason string
+}
+
+// Error returns the formatted error string.
+func (err *ProtocolError) Error() string {
+	return "protocol/v0v1/server: protocol error: " + err.Reason
+}
+
+// ErrUnexpectedPacket reports one unexpected pkt-line control packet.
+var ErrUnexpectedPacket = &ProtocolError{Reason: "unexpected control packet"}
+
+// ErrSideBandNotEnabled reports one attempt to write sideband frames without a
+// negotiated side-band-64k session.
+var ErrSideBandNotEnabled = &ProtocolError{Reason: "side-band-64k not enabled"}
-- 
cgit v1.3.1-10-gc9f91