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package zipextra
import "hash/crc32"
// ExtraFieldUCom is the Info-ZIP's Unicode Comment Extra Field identifier.
const ExtraFieldUCom uint16 = 0x6375
// InfoZIPUnicodeComment is the Unicode Comment Extra Field structure for
// holding NTFS file comments.
type InfoZIPUnicodeComment struct {
Version uint8
Crc32 uint32
Comment string
}
// NewInfoZIPUnicodeComment returns a new InfoZIPUnicodeComment extra field
// structure.
func NewInfoZIPUnicodeComment(comment string) InfoZIPUnicodeComment {
return InfoZIPUnicodeComment{
Version: 1,
Crc32: crc32.ChecksumIEEE([]byte(comment)),
Comment: comment,
}
}
// Encode encodes the InfoZIPUnicodeComment extra field.
func (field InfoZIPUnicodeComment) Encode() []byte {
buf := NewBuffer([]byte{})
defer buf.WriteHeader(ExtraFieldUCom)()
buf.Write8(field.Version)
buf.Write32(field.Crc32)
buf.WriteBytes([]byte(field.Comment))
return buf.Bytes()
}
// InfoZIPUnicodeComment returns the decoded InfoZIPUnicodeComment extra field.
func (ef ExtraField) InfoZIPUnicodeComment() (field InfoZIPUnicodeComment, err error) {
buf := NewBuffer(ef)
if buf.Available() < 5 {
return field, ErrInvalidExtraFieldFormat
}
field.Version = buf.Read8()
field.Crc32 = buf.Read32()
field.Comment = string(buf.ReadBytes(buf.Available()))
return
}
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