2-add-keyword-support (#6)

More development.

More types.
Fixed attribute groups in requests.
Started on client.
Saving data to file.

More types. Printing from chromeos works a little bit.

More types.

Spelling corrections.

WIP: Fix keyword handling

Move request to a separate file and add test.

Co-authored-by: Henrik Sölver <henrik.solver@gmail.com>
Reviewed-on: #6
Co-Authored-By: henrik <henrik.solver@gmail.com>
Co-Committed-By: henrik <henrik.solver@gmail.com>

packages/ipp/setofstrings.go

@@ -0,0 +1,88 @@
+package ipp
+
+import "encoding/binary"
+
+type setOfStrings struct {
+	name   string
+	values []string
+	vTag   tag
+}
+
+func NewSetOfStrings(name string, t tag, values []string) *setOfStrings {
+	s := new(setOfStrings)
+	s.name = name
+	s.vTag = t
+	s.values = values //make([]string, 0)
+	return s
+}
+
+func (s setOfStrings) String() string {
+	r := s.name + " :"
+	for _, v := range s.values {
+		r = r + " " + v
+	}
+	return r
+}
+func (s *setOfStrings) valueTag() tag {
+	return s.vTag
+}
+
+// func (k *keyWord) unmarshal(byteStream io.Reader) {
+// 	if len(k.values) == 0 {
+// 		var v string
+// 		k.name, v = unmarshalSingleValue(byteStream)
+// 		k.values = append(k.values, v)
+// 	} else {
+// 		var v string
+// 		_, v = unmarshalSingleValue(byteStream)
+// 		k.values = append(k.values, v)
+// 	}
+// }
+
+func (s *setOfStrings) marshal() []byte {
+	l := 5 + len(s.name) + len(s.values[0])
+	for i := range s.values[1:] {
+		l += 5 + len(s.values[i+1])
+	}
+	res := make([]byte, l, l)
+	p := 0
+	res[p] = byte(s.vTag)
+	p += 1
+	binary.BigEndian.PutUint16(res[p:p+2], uint16(len(s.name)))
+	p += 2
+	copy(res[p:], []byte(s.name))
+	p += len(s.name)
+	binary.BigEndian.PutUint16(res[p:p+2], uint16(len(s.values[0])))
+	p += 2
+	copy(res[p:], []byte(s.values[0]))
+	p += len(s.values[0])
+	for i := range s.values[1:] {
+		res[p] = byte(s.vTag)
+		p += 1
+		binary.BigEndian.PutUint16(res[p:p+2], uint16(0))
+		p = p + 2
+		binary.BigEndian.PutUint16(res[p:p+2], uint16(len(s.values[i+1])))
+		p = p + 2
+		copy(res[p:], []byte(s.values[i+1]))
+		p += len(s.values[i+1])
+	}
+
+	return res
+}
+
+func (s *setOfStrings) AddValue(v string) {
+	s.values = append(s.values, v)
+}
+
+func (s *setOfStrings) size() int {
+	l := 1 + 2 // The value tag (0x44) + name-length field (2 bytes)
+	l += len(s.name)
+	l += 2 // value-length field (2 bytes)
+	l += len(s.values[0])
+	// Add all additional values
+	for _, v := range s.values[1:] {
+		l += 1 + 4 // The value tag (0x44) + 2 length fields (2 bytes)
+		l += len(v)
+	}
+	return l
+}