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package zipextra
import (
"errors"
"io"
)
// ExtraField is a ZIP Extra Field byte slice.
type ExtraField []byte
// ErrInvalidExtraFieldFormat is returned when the extra field's format is
// incorrect.
var ErrInvalidExtraFieldFormat = errors.New("invalid extra field format")
// Parse parses all extra fields and returns a map with extra field identifiers
// as keys.
func Parse(extra []byte) (map[uint16]ExtraField, error) {
b := NewBuffer(extra)
efs := make(map[uint16]ExtraField)
for b.Available() >= 4 {
id := uint16(b.Read16())
size := int(b.Read16())
if b.Available() < size {
return efs, io.ErrUnexpectedEOF
}
efs[id] = ExtraField(b.Bytes()[:size])
b.Skip(size)
}
return efs, nil
}
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