Add constants

messages.go

@@ -0,0 +1,44 @@
+package main
+
+// References
+// https://tools.ietf.org/html/rfc8010
+// https://tools.ietf.org/html/rfc8011
+
+// Defined atribute group tags
+const (
+	beginAttributeGroupTag   = 0x00
+	operationAttributesTag   = 0x01
+	jobAttributesTag         = 0x02
+	endOfAttributesTag       = 0x03
+	printerAttributesTag     = 0x04
+	unsupportedAttributesTag = 0x05
+)
+
+// Defined value tags
+// from rfc8010
+const (
+	// Out of band
+	unsupportedValueTag = 0x10
+	unknownValueTag     = 0x12
+	noValueValueTag     = 0x13
+	// Integer values
+	integerValueTag   = 0x21
+	booleanIntegerTag = 0x22
+	enumValueTag      = 0x23
+	// Character string values
+	textWithoutLanguagage = 0x41
+	nameWithoutLanguagage = 0x42
+	keyword               = 0x44
+	uri                   = 0x45
+	uriScheme             = 0x46
+	charset               = 0x47
+	naturalLanguagage     = 0x48
+	mimeMediaType         = 0x49
+	memberAttrName        = 0x4a
+)
+
+type ippRequestHeader struct {
+	versionNumber uint16
+	operationId   uint16
+	requestId     uint32
+}