Add collection type, use buffered bytestream.

Fixed some more attribute types.

packages/ipp/request.go

@@ -1,6 +1,7 @@
 package ipp
 
 import (
+	"bufio"
 	"bytes"
 	"encoding/binary"
 	"fmt"
@@ -55,9 +56,10 @@ func (r Request) String() string {
 }
 
 func (r *Request) UnMarshal(body io.Reader) {
-	r.header.unmarshal(body)
+	buffbody := bufio.NewReader(body)
+	r.header.unmarshal(buffbody)
 	//log.Printf("Header %v", r.header)
-	r.a = UnMarshalAttributues(body)
+	r.a = UnMarshalAttributes(buffbody)
 }
 
 func (r *Request) RequestID() uint32 {