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package zipextra
import "time"
// ExtraFieldExtTime is the Extended Timestamp Extra Field
// identifier.
const ExtraFieldExtTime uint16 = 0x5455
// ExtendedTime is the Extended Timestamp Extra Field structure for holding a
// file entry's last modification time.
type ExtendedTimestamp struct {
ModTime time.Time
}
// NewExtendedTimestamp returns a new ExtendedTime extra field structure.
func NewExtendedTimestamp(modTime time.Time) ExtendedTimestamp {
return ExtendedTimestamp{
ModTime: modTime,
}
}
// Encode encodes the ExtendedTimestamp extra field.
func (field ExtendedTimestamp) Encode() []byte {
buf := NewBuffer([]byte{})
defer buf.WriteHeader(ExtraFieldExtTime)()
if field.ModTime.IsZero() {
return buf.Bytes()
}
buf.Write8(1)
buf.Write32(uint32(field.ModTime.Unix()))
return buf.Bytes()
}
// ExtendedTime returns the decoded ExtendedTime extra field.
func (ef ExtraField) ExtendedTimestamp() (field ExtendedTimestamp, err error) {
buf := NewBuffer(ef)
if buf.Available() == 0 {
return field, nil
}
if buf.Read8()&1 == 1 {
if buf.Available() < 4 {
return field, ErrInvalidExtraFieldFormat
}
field.ModTime = time.Unix(int64(buf.Read32()), 0)
}
return
}
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