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package packed
import (
"fmt"
"lindenii.org/go/furgit/object/id"
"lindenii.org/go/furgit/object/store"
"lindenii.org/go/lgo/intconv"
)
// lookup finds the pack containing objectID
// and the entry offset within it,
// probing packs in most-recently-used-ish order.
//
// Labels: Life-Parent.
func (packed *Packed) lookup(objectID id.ObjectID) (*pack, int, error) {
if objectID.ObjectFormat() != packed.objectFormat {
return nil, 0, fmt.Errorf(
"%w: got %s want %s",
id.ErrInvalidObjectFormat, objectID.ObjectFormat(), packed.objectFormat,
)
}
oid := objectID.RawBytes()
for _, p := range packed.order.Keys() {
if p.filter != nil && !p.filter.MayContain(oid) {
continue
}
offsetU, found, err := p.idx.Lookup(oid)
if err != nil {
return nil, 0, fmt.Errorf("%w: pack %q: %w", ErrMalformedPackedStore, p.name, err)
}
if !found {
continue
}
offset, err := intconv.Uint64ToInt(offsetU)
if err != nil {
return nil, 0, fmt.Errorf("%w: pack %q: entry offset overflows int: %w", ErrMalformedPackedStore, p.name, err)
}
packed.order.Touch(p)
return p, offset, nil
}
return nil, 0, store.ErrObjectNotFound
}
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