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package read
import (
"codeberg.org/lindenii/furgit/internal/intconv"
objectid "codeberg.org/lindenii/furgit/object/id"
)
// Lookup resolves one object ID to one graph position.
func (reader *Reader) Lookup(oid objectid.ObjectID) (Position, error) {
if oid.Algorithm() != reader.algo {
return Position{}, &NotFoundError{OID: oid}
}
for layerIdx := len(reader.layers) - 1; layerIdx >= 0; layerIdx-- {
layer := &reader.layers[layerIdx]
found, ok := layerLookup(layer, oid)
if ok {
idxU32, err := intconv.IntToUint32(layerIdx)
if err != nil {
return Position{}, err
}
return Position{Graph: idxU32, Index: found}, nil
}
}
return Position{}, &NotFoundError{OID: oid}
}
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