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sha.go
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/
sha.go
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package sku
import (
"github.com/friedenberg/zit/src/alfa/errors"
"github.com/friedenberg/zit/src/alfa/schnittstellen"
"github.com/friedenberg/zit/src/charlie/sha"
"github.com/friedenberg/zit/src/golf/objekte_format"
)
func CalculateAndConfirmSha(
sk SkuLikePtr,
format objekte_format.Formatter,
o objekte_format.Options,
sh schnittstellen.ShaLike,
) (err error) {
if err = CalculateAndSetSha(sk, format, o); err != nil {
err = errors.Wrap(err)
return
}
if !sk.GetObjekteSha().EqualsSha(sh) {
err = errors.Errorf(
"expected sha %q but got %q",
sh,
sk.GetObjekteSha(),
)
err = errors.Wrapf(err, "Format: %T", format)
return
}
return
}
func CalculateAndSetSha(
sk SkuLikePtr,
format objekte_format.Formatter,
o objekte_format.Options,
) (err error) {
w := sha.MakeWriter(nil)
if _, err = format.FormatPersistentMetadatei(w, sk, o); err != nil {
err = errors.Wrap(err)
return
}
sh := w.GetShaLike()
sk.SetObjekteSha(sh)
return
}
func ReadFromSha(
sk SkuLikePtr,
orf schnittstellen.ObjekteReaderFactory,
format objekte_format.Format,
o objekte_format.Options,
) (err error) {
expected := sk.GetObjekteSha()
var or schnittstellen.ShaReadCloser
if or, err = orf.ObjekteReader(expected); err != nil {
err = errors.Wrap(err)
return
}
defer errors.DeferredCloser(&err, or)
if _, err = format.ParsePersistentMetadatei(or, sk, o); err != nil {
err = errors.Wrap(err)
return
}
actual := or.GetShaLike()
if !actual.EqualsSha(expected) {
err = errors.Errorf("expected %s but got %s", expected, actual)
return
}
return
}