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raw.go
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raw.go
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package descriptor
import (
"fmt"
"github.com/pkg/errors"
)
type raw struct {
tag uint8
data []byte
}
func (d *raw) String() string {
return fmt.Sprintf("{tag:x%02X data[%d]}", d.tag, len(d.data))
}
func (d *raw) Tag() uint8 {
return d.tag
}
func (d *raw) Len() int {
return 2 + len(d.data)
}
func (d *raw) Unmarshal(b []byte) error {
d.tag = uint8(b[0])
l := int(b[1])
b = b[2:]
if len(b) < l {
return errors.Errorf("unexpected end of byte-slice: %d < %d", len(b), l)
}
d.data = make([]byte, l)
copy(d.data, b)
return nil
}
func (d *raw) Marshal() ([]byte, error) {
if len(d.data) > 0xff {
return nil, errors.Errorf("descriptor data field too large: %d", len(d.data))
}
b := make([]byte, d.Len())
b[0] = byte(d.tag)
b[1] = byte(len(d.data))
copy(b[2:], d.data)
return b, nil
}