1 files changed, 30 insertions, 0 deletions
diff --git a/format/sideband64k/errors.go b/format/sideband64k/errors.go
new file mode 100644
index 00000000..c04d7caa
--- /dev/null
+++ b/format/sideband64k/errors.go
@@ -0,0 +1,30 @@
+package sideband64k
+
+import (
+	"errors"
+	"fmt"
+)
+
+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 fmt.Sprintf("sideband64k: protocol error: %s", e.Reason)
+}