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tag_value.go
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/
tag_value.go
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package tlv
import (
"bytes"
"fmt"
)
type TaggedValue struct {
Tag Tag
Value Value
}
type TaggedValues []TaggedValue
func TaggedValuesListFromMap(m map[Tag]Value) TaggedValues {
result := make(TaggedValues, 0)
for tag, value := range m {
result = append(result, TaggedValue{
Tag: tag,
Value: value,
})
}
return result
}
func (list TaggedValues) GetValue(t Tag) Value {
for _, entry := range list {
if entry.Tag == t {
return entry.Value
}
}
return nil
}
func (list TaggedValues) ValuesBytes() []byte {
var buff bytes.Buffer
for _, item := range list {
buff.Write(item.Value)
}
return buff.Bytes()
}
func (list TaggedValues) MakeTLV() TLV {
tlv := make(TLV, 0)
for _, tv := range list {
tlv = append(tlv, Entry{
Tag: tv.Tag,
Length: len(tv.Value),
Value: tv.Value,
})
}
return tlv
}
func (list TaggedValues) Select(tagList TL) (TaggedValues, error) {
padData := func(data []byte, length int) []byte {
if len(data) < length {
data = append(make([]byte, length-len(data)), data...)
}
return data
}
var results TaggedValues
for _, entry := range tagList {
value := list.GetValue(entry.Tag)
if len(value) == 0 {
return nil, fmt.Errorf("missing data for object list: tag %s", entry.Tag)
}
value = padData(value, entry.Length)
results = append(results, TaggedValue{
Tag: entry.Tag,
Value: value,
})
}
return results, nil
}