From 311edcd50f3a84f4b860bde3cb887451d74eaa11 Mon Sep 17 00:00:00 2001
From: Runxi Yu
Date: Wed, 25 Mar 2026 16:22:03 +0000
Subject: network/protocol: Rename from protocol

---
 network/protocol/pktline/errors.go | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 network/protocol/pktline/errors.go

(limited to 'network/protocol/pktline/errors.go')

diff --git a/network/protocol/pktline/errors.go b/network/protocol/pktline/errors.go
new file mode 100644
index 00000000..866ff467
--- /dev/null
+++ b/network/protocol/pktline/errors.go
@@ -0,0 +1,31 @@
+package pktline
+
+import "errors"
+
+var (
+	// ErrInvalidLength indicates a malformed 4-byte hexadecimal length header.
+	ErrInvalidLength = errors.New("pktline: invalid length header")
+	// ErrTooLarge indicates a payload exceeds configured packet data limits.
+	ErrTooLarge = errors.New("pktline: payload too large")
+)
+
+// ProtocolError reports invalid pkt-line framing.
+//
+// It is returned for protocol violations such as invalid control values
+// (for example 0003) or non-hex length headers.
+type ProtocolError struct {
+	Header [4]byte
+	Reason string
+}
+
+func (e *ProtocolError) Error() string {
+	if e == nil {
+		return "<nil>"
+	}
+
+	if e.Reason == "" {
+		return "pktline: protocol error"
+	}
+
+	return "pktline: protocol error: " + e.Reason
+}
-- 
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