Simple roundtrip from ipptool works.

packages/ipp/response.go

@@ -0,0 +1,91 @@
+package ipp
+
+import "encoding/binary"
+
+type ippResponseHeader struct {
+	versionNumber versionNumber
+	statusCode    statusCode
+	requestId     uint32
+}
+
+func (h *ippResponseHeader) marshal() []byte {
+	a := make([]byte, 8, 8)
+	binary.BigEndian.PutUint16(a[0:2], uint16(h.versionNumber))
+	binary.BigEndian.PutUint16(a[2:4], uint16(h.statusCode))
+	binary.BigEndian.PutUint32(a[4:8], h.requestId)
+
+	return a
+}
+
+type Response struct {
+	header              ippResponseHeader
+	operationAttributes []Attribute
+	jobAttributes       []Attribute
+	printerAttributes   []Attribute
+}
+
+func NewResponse(code statusCode, requestId uint32) *Response {
+	r := new(Response)
+	r.header.versionNumber = 0x0101
+	r.header.requestId = requestId
+	r.header.statusCode = code
+	r.operationAttributes = make([]Attribute, 0)
+	r.printerAttributes = make([]Attribute, 0)
+	r.jobAttributes = make([]Attribute, 0)
+	return r
+}
+
+// func (r *Response) length() int {
+// 	l := 8 + 1
+// 	if len(r.jobAttributes) > 0 {
+// 		l += 1 //
+// 		for _, e := range r.jobAttributes {
+// 			l += e.length()
+// 		}
+// 	}
+// 	for _, e := range r.operationAttributes {
+// 		l += e.length()
+// 	}
+// 	for _, e := range r.printerAttributes {
+// 		l += e.length()
+// 	}
+
+// }
+
+func (r *Response) Marshal() []byte {
+	a := make([]byte, 0, 20)
+	a = append(a, r.header.marshal()...)
+	if len(r.operationAttributes) > 0 {
+		a = append(a, byte(operationAttributes))
+		for _, e := range r.operationAttributes {
+			a = append(a, e.marshal()...)
+		}
+	}
+	if len(r.jobAttributes) > 0 {
+		a = append(a, byte(jobAttributes))
+		for _, e := range r.jobAttributes {
+			a = append(a, e.marshal()...)
+		}
+	}
+	if len(r.printerAttributes) > 0 {
+		a = append(a, byte(printerAttributes))
+		for _, e := range r.printerAttributes {
+			a = append(a, e.marshal()...)
+		}
+
+	}
+	a = append(a, byte(endOfAttributes))
+	return a
+}
+
+func (r *Response) AddPrinterAttribute(a Attribute) {
+	r.printerAttributes = append(r.printerAttributes, a)
+}
+
+func (r *Response) AddOperatonAttribute(a Attribute) {
+	r.operationAttributes = append(r.operationAttributes, a)
+}
+
+func (r *Response) AddJobAttribute(a Attribute) {
+	r.jobAttributes = append(r.jobAttributes, a)
+}