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/keyword_test.go

@@ -0,0 +1,36 @@
+package ipp
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+// func TestUnmarshalSimpleKeyword(T *testing.T) {
+// 	testdata := []byte{
+// 		0x00, 0x14,
+// 		0x72, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x65, 0x64, 0x2d, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73,
+// 		0x00, 0x16,
+// 		0x70, 0x72, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x2d, 0x6d, 0x61, 0x6b, 0x65, 0x2d, 0x61, 0x6e, 0x64, 0x2d, 0x6d, 0x6f, 0x64, 0x65, 0x6c,
+// 	}
+// 	buf := bytes.NewBuffer(testdata)
+// 	var k keyWord
+// 	k.unmarshal(buf)
+// 	assert.Equal(T, k.name, "requested-attributes")
+// 	assert.Equal(T, k.values[0], "printer-make-and-model")
+// }
+
+func TestMarshalSimpleKeyword(T *testing.T) {
+	testdata := []byte{
+		0x44, 0x00, 0x14,
+		0x72, 0x65, 0x71, 0x75, 0x65, 0x73, 0x74, 0x65, 0x64, 0x2d, 0x61, 0x74, 0x74, 0x72, 0x69, 0x62, 0x75, 0x74, 0x65, 0x73,
+		0x00, 0x16,
+		0x70, 0x72, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x2d, 0x6d, 0x61, 0x6b, 0x65, 0x2d, 0x61, 0x6e, 0x64, 0x2d, 0x6d, 0x6f, 0x64, 0x65, 0x6c,
+	}
+
+	k := NewKeyWord("requested-attributes")
+	k.addValue("printer-make-and-model")
+	m := k.marshal()
+	assert.Equal(T, testdata, m, "Should be equal")
+
+}