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constructed.go
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/
constructed.go
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package der
import (
"io"
)
func NodeByTag(ns []*Node, tag int) *Node {
for _, n := range ns {
if n.tag == tag {
return n
}
}
return nil
}
func NewConstructed(params ...Parameter) (n *Node) {
class := CLASS_CONTEXT_SPECIFIC
tag, ok := getTagByParams(params)
if !ok {
class = CLASS_UNIVERSAL
tag = TAG_SEQUENCE
}
return &Node{
class: class,
tag: tag,
constructed: true,
}
}
func CheckConstructed(n *Node, params ...Parameter) error {
if !n.constructed {
return ErrNodeIsNotConstructed
}
tag, ok := getTagByParams(params)
if !ok {
return CheckNode(n, CLASS_UNIVERSAL, TAG_SEQUENCE)
}
return CheckNode(n, CLASS_CONTEXT_SPECIFIC, tag)
}
func childSerialize(n *Node, s Serializer, tag int) error {
child, err := s.SerializeDER(Tag(tag))
if err != nil {
return err
}
if child != nil {
n.Nodes = append(n.Nodes, child)
}
return nil
}
func childDeserialize(n *Node, d Deserializer, tag int) error {
child := NodeByTag(n.Nodes, tag)
// child can be nil for an optional value
return d.DeserializeDER(child, Tag(tag))
}
func encodeNodes(ns []*Node) (data []byte, err error) {
for _, n := range ns {
if n == nil {
continue
}
data, err = EncodeNode(data, n)
if err != nil {
return nil, err
}
}
return data, nil
}
func decodeNodes(data []byte) (ns []*Node, err error) {
for {
child := new(Node)
data, err = DecodeNode(data, child)
if err != nil {
if err == io.EOF {
break
}
return nil, err
}
ns = append(ns, child)
}
return ns, nil
}